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  • 专利说明
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  • 类似技术
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    • 专利摘要:
    A temperature sensor adapter assembly and a temperature sensor adapter method include a conversion circuit (188) configured to receive an input characteristic of an input temperature sensor and (124) to generate a pulse width signal having a pulse width that varies in response to the received input characteristic. In addition, the arrangement includes an impedance circuit (130) coupled to the conversion circuit (108) for receiving the pulse width signal coupled to an output (106) and providing an impedance at the output (106) in response to the pulse width of the signal received pulse width signal is configured. The impedance provided at the output (106) corresponds to an impedance of a synthesized temperature sensor different from the input temperature sensor.
    公开号:AT12807U1
    申请号:TGM254/2011U
    申请日:2007-05-21
    公开日:2012-12-15
    发明作者:
    申请人:Watlow Electric Mfg；
    IPC主号:
    专利说明:

    Austrian Patent Office AT12 807U1 2012-12-15
    Description [0001] The present disclosure relates to temperature sensors, and more particularly to circuits for connecting temperature sensors to temperature measuring instruments via an interface.
    The statements in this section merely provide background information related to the present disclosure and need not form any prior art.
    Temperature sensors are used in a wide variety of operating environments to monitor operational and environmental characteristics. They are located in or assigned to the operating environment being monitored and are designed to generate an electrical signal or an electrical characteristic, such as an impedance, voltage or current, in response to changes in temperature the monitored operating environment varies.
    Typically, temperature sensors are designed for particular operating environments and for particular operating ranges based on a trade-off between performance over the range of property to be monitored and the cost. Some temperature sensors have high sensitivity in narrow surveillance areas, while others have lower sensitivity but with wider surveillance areas. In addition, some temperature sensors are designed for harsh environments that provide the sampling of operating characteristics without requiring constant replacement. For example, thermistors and resistance temperature detectors (RTDs) have impedances that contain resistors that vary with temperature and that are often used for temperature measurement. These devices use semiconductor devices that can be prone to error in a harsh operating environment. In addition, thermistors can be extremely sensitive, but usually they are linear only over a narrow temperature range. In contrast, thermocouples generate an output voltage because of the well-known Seebeck effect and can have a wider linear temperature sensing range. The designs of thermocouples allow them to be arranged in harsh environments, but are generally less expensive than thermistors.
    Temperature sensors are typically coupled to a measuring instrument or to a measuring device that is adapted to receive or determine the property provided by the sensor and to determine in response thereto the value of the monitored operating characteristic. For example, a temperature measuring instrument includes an interface and temperature measuring hardware and software for receiving or determining a value of a characteristic of a temperature coupled thereto and for determining a temperature measured by the temperature sensor. Each instrument is designed and configured for a particular sensor type, such as various types of thermocouples, thermistors, RTDs, pressure sensors, and motion detectors. A common type of temperature measurement instrument is configured to determine a sensed temperature from an RTD temperature sensor. Although some meters may be configurable or selectable between sensor types, it is common for each to be specialized for the particular sensor type.
    However, operators of measuring systems with measuring instruments and sensors would often like to use a different type of temperature sensor without having to replace or change the measuring instrument. For example, an operator may wish to sample a temperature with a thermocouple, although the operating system is already equipped with temperature sensing systems designed for resistance-type temperature sensors, such as for a particular type of RTD or thermistor. Alternatively, the operating environment may be configured for use with a thermocouple, wherein the operator may desire to use a resistance type temperature measurement instrument.
    The inventor thereof has successfully developed circuits, arrangements, systems and methods for adapting a temperature sensor or a temperature measuring instrument for interfacing with a device other than the one , was designed to connect to via an interface while still allowing proper monitoring or detection within the operating environment. In some embodiments, this may provide reliable and inexpensive systems and methods for adapting a temperature sensor to a temperature measuring instrument configured to interface with another type of temperature sensor via an interface, and for improving the sensitivity or the sensing range of the temperature sensor.
    In accordance with one aspect, a temperature sensor adapter assembly includes a conversion circuit configured to receive an input characteristic of an input temperature sensor and generate a pulse width signal having a pulse width that varies in response to the received input characteristic. In addition, the arrangement includes an impedance circuit coupled to the conversion circuit for receiving the pulse width signal coupled to an output and configured to provide an impedance at the output in response to the pulse width of the received pulse width signal. The impedance provided at the output corresponds to an impedance of a synthesized temperature sensor different from the input temperature sensor.
    In accordance with yet another aspect, a temperature sensor adapter system includes an input for receiving an electrical signal from a thermocouple and an output for coupling to an input of a temperature measurement instrument configured to receive an input from an impedance temperature sensor for determining a sensed temperature is. In addition, the arrangement includes a processor coupled to the input for receiving the electrical signal and configured to generate a pulse width signal having a pulse width that varies in response to the received electrical signal. A control circuit is coupled to the processor and configured to receive the pulse width signal and convert the pulse width signal into a control signal in response to the pulse width of the received pulse width signal. An impedance device is coupled to receive the control signal to the control circuit and is configured to provide an impedance at the output in response to the control signal corresponding to an impedance of an impedance-based temperature sensor.
    [0010] In accordance with another aspect, a temperature sensor adapter circuit includes means for converting an input characteristic received at an input from a temperature sensor configured to sense a temperature into a pulse width signal having a pulse width responsive to the received input characteristic and a means for providing an output characteristic at an output corresponding to a property of a synthesized temperature sensor and in response to the pulse width of the pulse width signal, wherein the synthesized temperature sensor is different from the input temperature sensor.
    In accordance with yet another aspect, a method for detecting a temperature includes receiving a voltage generated by a thermocouple sensing an operating temperature, generating a pulse width signal having a pulse width that varies in response to the received voltage and providing an impedance at an output that varies in response to the pulse width of the pulse width signal and that corresponds to an impedance of an impedance-based temperature sensor that samples the operating temperature.
    Other aspects of the present disclosure are in part apparent below and in part shown below. Of course, various aspects of the disclosure may be implemented individually or together with one another. In addition, although the detailed description and drawings, while indicating certain exemplary embodiments, are, of course, intended for purposes of illustration only, and are not to be construed as AT12807U1 2012-12-15
    Limitation of the scope of the disclosure.
    BRIEF DESCRIPTION OF THE DRAWINGS
    Fig. 1 is a block diagram of a sensor adapter system having a sensor adapter circuit connected between an input device and an output device via an interface, in accordance with an exemplary embodiment; FIG. 2 is a block diagram of a temperature sensor adapter system having a temperature sensor adapter circuit interface that receives an input characteristic from an input temperature sensor and provides an output impedance, in accordance with another exemplary embodiment; FIG. FIG. 3 is a graphical representation of three pulse width signals in accordance with various exemplary embodiments; FIG. Fig. 4 is a block diagram of a temperature sensor adapter system for interfacing with a plurality of temperature sensors and providing a variable impedance output in accordance with yet another exemplary embodiment; FIG. 5 is a circuit diagram of a sensor adapter circuit in accordance with another exemplary embodiment; FIG. FIG. 6 is a flowchart of a method of adjusting a sensor in accordance with an exemplary embodiment; FIG. and FIG. 7 is a block diagram of a processing system for a sensor adapter in accordance with some example embodiments.
    Of course, throughout the drawings, corresponding reference characters designate like or corresponding parts and features.
    [0021] The following description is merely exemplary in nature and is not intended to limit the present disclosure or the applications or uses of the disclosure.
    In one embodiment, an electronic adapter assembly includes a conversion circuit and an output circuit. The conversion circuit is coupled to an input and configured to receive an input characteristic of an input device that is also coupled to the input. Typically, the input device is positioned to provide the input characteristic and the value of the characteristic is associated with an operation and / or the environment via the input device. The input device may be, for example, any type of input sensing device including a temperature sensor, a humidity sensor, a velocity sensor, a pressure sensor, a flow sensor, a motion sensor, a voltage sensor, a current sensor, and an impedance sensor. The conversion circuit generates a pulse width signal having a pulse width that varies in response to the received input characteristic. The output circuit is coupled to an output and to the conversion circuit and configured to receive the pulse width signal and to provide a characteristic at the output that varies in response to the pulse width of the pulse width signal. The property at the output corresponds to a property of a synthesized device different from the input device. The synthesized device may be any type of device for which the synthesis of the output is desired, and may include, for example, a temperature sensor, a humidity sensor, a velocity sensor, a flow sensor, a motion sensor, a pressure sensor, a voltage sensor, a current sensor, and an impedance sensor. The value of the property is generally provided as the value that would be provided by the synthesized device if the synthesized device were positioned instead of the input device and used.
    In Fig. 1, an exemplary electronic adapter system 100 includes a sensor adapter circuit 102 having an input 104 and an output 106. Coupled to the input 104 is a conversion circuit 108. An output circuit 110 is coupled to the output 106. Connected to the input 104 is an input device 112, such as a sensor. Connected to the output 106 is an output device 116, such as a meter.
    The input device 112 may be any type of device and may include a temperature sensor, a humidity sensor, a speed sensor, a pressure sensor, a flow sensor, a motion sensor, a voltage sensor, a current sensor, and an impedance sensor. Generally, the input device 112 provides an input characteristic Cin to the input 104. The input device 112 generates a characteristic such as an analog signal having a voltage or current value which varies with time or based on a particular operating characteristic or sampled characteristic. In other embodiments, the input device 112 may provide an impedance characteristic (and will be described generally herein) in response to an externally supplied voltage or to an externally supplied current, such as one provided by the sensor adapter circuit 102 used to contain a base resistor or a complex impedance). The input 104 is configured to receive the input property Cin from the input device 112 and provides it to the conversion circuit 108.
    The conversion circuit 108 receives the input characteristic Cin and generates a pulse width signal Spw having a pulse width that varies depending on the received input characteristic. The pulse width signal Spw may be a digital signal or an analog signal. As will be discussed in more detail below, the conversion circuit 108 may determine the appropriate pulse width for the pulse width signal Spw in a variety of different manners and based on a variety of different processes. In summary, here conversion circuit 108 determines the pulse width for pulse width signal Spw based on the input characteristic and / or value for an operating characteristic and / or output circuit 110 associated with input device 112 and their functionalities and capabilities and / or one or more characteristics of a synthesized one Device (not shown). The operating characteristic may be any property and may include temperature, pressure, humidity, flow, movement and velocity. The synthesized device is a device for which an output characteristic Cout would have been synthesized by the output circuit if the synthesized device had originally sampled the operating characteristic rather than being sampled by the input device 112. For example, the conversion circuit 108 and the output circuit 110 are configured to generate the pulse width signal Spw having a pulse width corresponding to the synthesized property of the synthesized device that detects the operational characteristic as detected by the input device 112.
    The output circuit 110 receives the pulse width signal Spw generated by the conversion circuit 108 and provides the output characteristic Cout at the output 106 and / or the output device 116. It is noted here that throughout the disclosure of the input characteristics Cin, the pulse width of the pulse width signal SPw, the output characteristic COLrt, changes to or dependencies therefrom vary due to changes in the properties and / or values of the characteristics, and that the present description, Although this in itself is not stated, should include both interpretations. Thus, the value of the output property may change depending on or in response to a change in the value of the input property and / or the value of the operating characteristic, the " value " the property is implied in all descriptions, but is not specifically cited or given.
    As will be further discussed below, the electronic adapter circuit may receive multiple input characteristics Cin from multiple input devices 112 and determine a single output characteristic Cout depending on the multiple input characteristics Cin. The determination of the appropriate pulse width, and thus the output characteristic Cout, may for example include a calculation, an averaging, an algorithm, and a mapping such that the output characteristic Cout is determined from a plurality of input characteristics Cin or measurements.
    As another example of a specific type of electronic adapter assembly shown in FIG. 1, the electronic adapter assembly may be a temperature sensor adapter assembly. In the temperature sensor adapter arrangement embodiments, the conversion circuit 110 is configured to receive an input property of an input temperature sensor (e.g., input device 112 of Fig. 1) that detects a temperature of an operating environment and generates a temperature characteristic. The temperature characteristic may be any type of property and includes, by way of example, voltage, current, and resistance. In general, the input characteristic provided by the input temperature sensor varies based on the profile of the characteristic to the temperature of the input temperature sensor depending on the operating temperature. The conversion circuit 110 correlates the received input property of the temperature sensor to determine a pulse width that causes the impedance circuit at the output to provide an output impedance that corresponds to an impedance of the desired synthesized device. The conversion circuit 110 generates a pulse width signal having a pulse width that varies in response to the input characteristic of the input temperature sensor and that results in the synthesized impedance value. In addition, the temperature sensor adapter assembly embodiment includes an output impedance circuit (as the off-circuit 110) coupled to the conversion circuit 110 and receiving the pulse width signal Spw. The output impedance circuit provides at the output 106 in response to the pulse width of the pulse width signal Spw and according to the impedance of the synthesized temperature sensor a synthesized impedance as the output characteristic COLrt. In general, the input temperature sensor in this exemplary embodiment may be any type of temperature sensor including any one Type of input characteristic Cin including, by way of example, voltage, current, and impedance. The synthesized sensor may be any type of variable impedance temperature sensor type such as any type of thermistor or RTD type. This exemplary embodiment receives and adjusts the input characteristic Cin from the input temperature sensor to have an impedance value that correlates and / or has the same impedance profile (eg, impedance vs. temperature) as the synthesized temperature sensor. In addition, those skilled in the art will understand that the profiles of the synthesized device may be based on actual devices or may be profiles of improved performance or improved devices, such as devices having a higher bandwidth of linearity in their output property profile for performance. In this way, the adapter circuit adjusts the temperature sensor to be the output of a known or improved synthesized temperature sensor sensing the same temperature, thereby allowing the input sensor to interface with a temperature sensing system or instrument suitable for receiving the temperature sensor is designed to the profile of the synthesized temperature sensor associated impedance value.
    2, an example of a temperature sensor adjustment system 120 is shown. As shown, the temperature sensor adapter circuit 122 is an example of the electronic adapter circuit 102 of FIG. 1 configured to receive the input property Cin from a temperature sensor 124, which in this example is the input device 112. The temperature sensor 124 may be a thermocouple that provides a voltage or current to the input 104, or may be an impedance-type temperature measurement device such as a thermistor or an RTD. In the later case of a sensor of the impedance type, the temperature sensor adapter circuit 122 can be connected via the input 104 to the Austrian Patent Office AT12 807U1 2012-12-15
    Device of the temperature sensor 124 of the impedance type deliver a release voltage or a release current or a bias voltage or a bias current for determining the supplied value of the impedance input characteristic Cin. The output circuit 110 is an output impedance circuit 130 in this illustrated embodiment.
    The conversion circuit 108 may include one or more processors 126, such as any known type of processing chip or system, and may include a digital signal processor (DSP). Additionally, memory 128 may be associated with processor 126 or included in processor 126. An exemplary computer operating environment for the conversion circuit 108 is given below with respect to FIG. 7. In one embodiment, the conversion circuit 108 is programmable with computer-executable instructions stored or provided in a computer-readable medium and configured to determine a sensed temperature in dependence on the temperature input characteristic Cin.
    In one embodiment, the conversion circuit 108 includes one or more analog-to-digital converters (ADCs). An analog input signal is received by the temperature sensor 124, contains the input characteristic Cin and is converted from analog to digital by the ADC. The digitized input signal may then be digitally processed to, for example, determine the operational characteristic value as sensed by the temperature sensor 124. One or more reference signals, such as a reference DC voltage, may also be converted to a digital signal. The digitized reference signals can also be changed by a linear compensation function.
    The conversion circuit 108 may use the determined operational characteristic value and the changed reference signal to determine the appropriate value of the output characteristic Cout associated with the synthesized device. In addition, the conversion circuit 108 may set the required pulse width of the pulse width signal Spw to provide the output characteristic value at the output 106 through the output impedance circuit 130, e.g. through the output circuit 110. The pulse width may be determined by the processor 126 using computer instructions, such as one or more algorithms, tables, maps, processes, to control the output impedance circuit 130 to provide the particular value of the output impedance Z0 corresponding to the synthesized device. In some embodiments, the conversion circuit 108 is for utilizing models of the synthesized device, the profile of the output characteristic COLrt to the operating characteristic or the algorithm of the synthesized device and / or the properties and / or the profile of the impedance circuit 130 and the components thereof depending on the delivered Pulse width of the pulse width signal Spw configured. The conversion circuit 108 may be adaptable via a user or via a programming interface to a variety of different types of temperature sensors 124 in different operating environments and to a plurality of synthesized devices. These models define known device profiles and performance and may also be changed to improve sensitivity, linear bandwidth and / or performance since the synthesized device may be a theoretical device. In this way, the adapter circuit 102 may be attractive to a wide range of applications, including improving performance characteristics where the synthesized device is an improved performance model of the temperature sensor 124. For example, the adapter circuit 102 may be used to enhance the linearity of the temperature sensor 124 over areas where the temperature sensor 124 is typically non-linear. Thus, the temperature sensor 124 may be selected based on cost, availability, or performance in the operating environment.
    After the conversion circuit 108 has determined the appropriate pulse width for supplying the synthesized output characteristic Cout such as the output impedance Z0, the conversion circuit 108 generates the pulse width signal Spw having the determined pulse width. The impedance circuit 130 includes a control circuit 132 configured to receive the pulse width signal Spw and generate a control signal Scon. 6/25 Austrian Patent Office AT12 807U1 2012-12-15
    The control signal Scon may be any type of electrical signal and may include, by way of example, a DC and / or DC signal. The control circuit 132 may include one or more operational amplifiers, integrators or integrator circuits, and / or one or more filters, such as a linear filter.
    Connected to the output 106 is an output device 134, such as a variable impedance device, such that the output characteristic C out of the output 106 varies through the output device 134. The output device 134 may provide an output impedance Z0, an output voltage, or an output current that varies in response to the control signal Scon. For example, the output device 134 may include a semiconductor or transistor, and in one embodiment is a field effect transistor (FET), such as a metal oxide field effect transistor (MOSFET). In the latter case, the control signal Scon may be a bias voltage coupled to a gate on the MOSFET, and the output characteristic Cout may be the impedance Z0 between the source and the drain, responsive to activation of the gate in response to the gate Voltage of the control signal Scon varies. In other embodiments, the output circuit 110 may include a voltage or current source and a variable voltage device, or a variable current device for synthesizing a synthesized temperature sensor that provides a voltage or current that is responsive to the input characteristic C in the temperature varies, included.
    Of course, as understood by those skilled in the art, the conversion circuit 108 and the impedance circuit 130 may include fewer or more circuit components than described herein and still be within the scope of the present disclosure. As will be described below, by way of example, one or more feedback signals may be provided to the conversion circuit 108 for inclusion in determining the appropriate pulse width of the pulse width signal Spw or the impedance circuit 130 for determining the control signal Scon to control an output circuit 110 such as the impedance circuit 130 , These are discussed in more detail below with reference to FIGS. 4-6.
    Referring now to Fig. 3, a timing diagram 138 illustrates the pulse width signal Spw having the pulse width varying in response to the input characteristic Cin, e.g. For example, the width of the pulses of the pulse width signal varies depending on the value of the input characteristic Cin provided by the input device 112 as exemplified above as the temperature sensor 124, for example. In this example, the first pulse diagram 138A represents a first input characteristic Cin1 as a first voltage Vi. The conversion circuit 108 receives the first voltage Vi, determines a first temperature Ti, and then determines the first pulse width PW1 corresponding to the first voltage Vi and / or corresponds to the first temperature Ti. The first pulse width signal Spwi having the first pulse width PWi is shown in the signal diagram 138A with a pulse time interval of Tlpw and a pulse rate of PR! (the pulse rate here describes the time rate of the pulses, which can also be considered as the frequency of the pulses). Although the pulse rate PR may vary in some embodiments, the pulse rate PR in a preferred embodiment is substantially constant over time and generally independent of the received input characteristic Cin. As indicated on the left in the signal diagram 138A, the first pulse width PWi provides a first output resistance Ri.
    Subsequently, a second input characteristic Cin is received, which has a second voltage V2, which is smaller than the first voltage Vi. The conversion circuit 108 receives the second voltage V2, determines a second temperature T2, and then determines the second pulse width PW2 corresponding to the second voltage V2 and / or the second temperature T2. The second pulse width signal SpW2 is shown in the signal diagram 138B at the pulse time interval of Tlpw and at a pulse rate of PR2, which in some embodiments may be equal to the first bit rate PRi. Since the second voltage V2 is smaller than the first voltage Vi, the second pulse width PW2 is smaller than the first pulse width PWi. However, in some embodiments, the pulse width may, of course, increase while the Austrian patent office AT 12 807 U1 2012-12-15
    Value of the input property decreases, which is further within the scope of the disclosure.
    The signal diagram 138C represents a change of the input characteristic Cin, in this example the voltage V, over time. As shown, the input characteristic Cin starts as a first voltage value V3 which is higher than Λ and V2. The third voltage V3 results in a determination of a third temperature T3, a third pulse width PW3, and a third output characteristic value of a resistor R3. While the input characteristic Cin changes from the third voltage V3 to the first voltage νΊ, the determined temperature changes to the first temperature Ti and causes the first pulse width PW! is produced. From the first pulse width PW! While, for example, the input circuit Cin changes from the first voltage Vi to the second voltage V2, the predetermined temperature changes to the second temperature T2, as a result of which the second pulse width PW2 is generated. From the second pulse width PW2, the output circuit 110 generates the second output resistance R2. Thus, it can be seen that the width of the pulses varies depending on the received input characteristic Cin (such as depending on the value of the input characteristic Cin) and / or on the particular temperature T. In addition, the output characteristic Cout such as the impedance or the resistance changes depending on the pulse width.
    Referring now to FIG. 4, an adapter system 140 is another exemplary embodiment of the electronic adapter circuit 102, and more specifically, another exemplary embodiment of the temperature sensor adapter circuit 122. As shown, a plurality of temperature sensors 124 (shown as 124 i through 124 n and corresponding to the input devices 112! And 11 2n) are coupled to the input 104, each providing an input characteristic Cin, shown as Cini to CinN. The conversion circuit 108 receives each of the input characteristics Cin and generates one or more pulse width signals Spw. In one embodiment, the conversion circuit 108 of two or more temperature sensors 124 receives two or more input characteristics and generates them in response to the multiple input characteristics or multiple temperatures For example, the determination of the pulse width for the pulse width signal Spw may be based on an averaging of the input characteristics or the determined temperatures TN. In other embodiments, the pulse width may be generated from a software model that relates to the environment and / or to the particular application and to the characteristics of the synthesized temperature sensor.
    In yet further embodiments, the conversion circuit 108 may receive the plurality of input characteristics Cin and generate two or more pulse width signals Spwn, each depending on one or a combination of more than one input property Cin. In this case, the temperature sensor adapter circuit 122 may include a plurality of output circuits 110 such as a plurality of impedance circuits 130 at a plurality of outputs 106n. Each of the plurality of temperature sensors 124 or other input devices 112 may be of the same type or of a different type. In addition, each of the plurality of temperature sensors 124 or other input devices 112 may provide the same or different input characteristic CinN. In addition, each of the output circuits 110N may provide the same output characteristic Cou, or other output characteristic Cou.
    As also shown in FIG. 4, in a temperature sensing application in which one or more of the temperature sensors 124 is a thermocouple, a comparison digit compensation circuit (CJC) 142 may provide a compensation signal Scomp to the conversion circuit 108. As is known in the art, the compensation signal S ^ mp from the conversion circuit 108 may be used to determine the temperature T at the thermocouple's sensing location. The conversion circuit 108 may use the compensation signal Scomp at least partially for determining the appropriate width of the pulses in the pulse width signal Spw to be generated for synthesizing the output characteristic Cout. Of course, more than one cold junction compensation circuit 142 may provide more than one signal and other types of input or compensation signals than a cold junction compensation signal for use with in the US patent application Ser Generating the width of the pulses for the pulse width signal Spw are supplied to the conversion circuit 108. As noted above, this may also include a feedback signal.
    An example of a feedback signal is generated by a conversion feedback circuit 144. The conversion feedback circuit 144 is coupled to or associated with the output 106 to provide a conversion feedback signal FSconv to the conversion circuit 108. The conversion feedback signal FSconv may include a voltage, current, impedance or more complex analog or digital signal formed from the output of the output circuit 110 that is used by the conversion circuit 108 to determine the appropriate width of the pulses of the pulse width signal Spw of the appropriate value of the output characteristic Cout is used to synthesize the property of the synthesized device. For example, in one embodiment, the conversion feedback circuit 144 generates the conversion feedback signal FSconv as a current shunt or voltage shunt from the output 106 using the conversion feedback signal FSCOnv from the conversion circuit 108 to determine the width of the pulses of the pulse width signal Spw.
    In some embodiments, an output control feedback circuit 146 is coupled to or associated with the output 106 to provide an output control feedback signal FSoc to or within the output circuit 110, such as the impedance circuit 130. The output circuit 132 within the output circuit 110 may utilize the output control feedback signal FS0c in generating the control signal Scon to control the output device 134 and / or to provide the output characteristic Coui with the appropriate synthesized feature value. For example, in one embodiment, output control feedback circuit 146 provides a voltage from output 106 as output control feedback signal FSoc. In one embodiment, the voltage supplied is a voltage coupled to output 106 at output 106 and connected to output Interface is received with a temperature sensor configured by the impedance type temperature measuring instrument. In other embodiments, the voltage may be generated within the adapter circuit 102. The output circuit 110 may adjust the control signal Scon based on variations in the voltage supplied by generating an output control feedback signal FSoc in response to the voltage at the output 106 and thus adjust the supplied output characteristic Cout or values thereof. Since the output control feedback circuit 146 may also be based on a current or on the output characteristic Cout itself, or in some cases may be based on an external input from the measuring instrument, this is just one example.
    In some embodiments, the output control feedback signal FS0C may also be provided to the conversion circuit 108. In this manner, the conversion circuit 108 may also make adjustments to the width of the pulses of the pulse width signal Spw to adjust for variations in the voltage, current, impedance, or output characteristic C out of the output 106. For example, this may include using the output control feedback signal FSoc as a variable reference or as a variable reference signal to the processor 126.
    FIG. 5 illustrates an example circuit diagram of an electronic adapter circuit 102, as described generally above with reference to FIG. 6. As those skilled in the art will appreciate, additional circuit components and / or alternative wiring, and additional component functionality may be implemented within the circuit, which is further within the scope of the present circuit disclosure. For example, there are various methods and a system for properly biasing one or more components within a circuit and for control, programming and the Austrian Patent Office AT 12 807 Ul 2012-12-15
    Operation of the processor well-known in the circuit design. Although the circuit of FIG. 5 represents only a single input temperature sensor and a single output, the circuit may also be configured to include two or more input temperature sensors and two or more outputs associated with the two or more input temperature sensors. The common components and elements are not described again here since they are described generally with respect to FIG. 5.
    In this embodiment, the conversion circuit 108 includes a processing system having an integrated memory in the processor 126. In addition, a programming interface 150 includes multiple inputs and outputs for operating, installing software, programming, and monitoring the processor 126 and, more generally, the conversion circuit 108. The conversion circuit 108 may receive a reference voltage from a source external to the adapter circuit 148 or may receive a reference voltage from within the adapter circuit 148. For example, in one embodiment, the reference voltage is a voltage that is at least partially generated from a voltage at the input 106, such as may be provided by the output control feedback signal FSoc.
    With regard to the output circuit 110, the adapter circuit 148 includes an output control circuit 132 including an operational amplifier (OPV) 152 configured in an integration circuit for supplying the control signal Scon. The OPV is configured to receive the pulse width signal Spw at an inverting input to the OPV 152. The output control feedback signal FSoc is derived from the voltage and / or current at the output 106 and provided to the non-inverting input to the OPV 152. In this way, the OPV 152 integrates the pulse width signal Spw with the output control feedback signal FSoc to generate the control signal Scon. The output device 134 includes a MOSFET output transistor 154 having a gate coupled to receive the control signal Scon, the drain coupled to the output 106, and the source coupled to the ground via a resistor. In this way, the control signal Scon controls the gate, which in turn regulates the conductivity and thus the impedance between the drain and the source and thus the impedance at the output 106.
    A power source may also be included in the adapter circuit 148 and associated with the output and / or coupled to the drain (shown as a dashed line that receives V +) and / or to the source of the transistor 154 to be referred to as the output characteristic C0ut to supply a voltage or a current instead of an impedance. In addition, the pulse width signal Spw may also be provided as an output of the adapter circuit 148 and provided to a measuring device 116. In some embodiments, the measuring device 116 may implement one or more of the components and functions of the output circuit 110 as described herein, or may be configured to directly determine the operating environment characteristic from the pulse width of the pulse width signal Spw. As noted, the adapter circuit 148 of FIG. 5 is only one exemplary embodiment of the adapter circuit 102 as designed and tested by the inventors. As will be understood by those skilled in the art, various other alternative circuit designs may also be made to implement the elements of the claims and to provide similar or equivalent functionality and to carry out the processes and methods as described herein. These may include one or more of the methods of operation of the present disclosure as now addressed.
    In operation, a method of adaptation may include a method of sampling as an example adaptation implementation. As illustrated in FIG. 6, a method 200 may include receiving input property Cin, such as voltage, current, or impedance, in process 202 from an input device, such as a sensor positioned and configured to sample an operating characteristic within an operating environment. For example, it may be that a thermocouple generates a voltage because of sensing a temperature. The procedure contains the 10/25 Austrian Patent Office AT 12 807 U1 2012-12-15
    Producing a pulse width signal Spw having a pulse width that varies in response to the received input property in the process 204. In the process 206, an output characteristic C0ut is provided at the output 106 in response to the pulse width of the generated pulse width signal Spw. As noted above, the output characteristic COLrt may include only the impedance, the voltage and / or the current. The output characteristic Cout provided at the output 106 corresponds to a property of a synthesized sensor that may be different from the characteristic of the input device 112. The value of the output characteristic Cout refers to the value of the property of the synthesized sensor if, instead of the input device 112, the synthesized sensor had sampled the operating characteristic within the operating environment. One example of such an adaptation is the adaptation of the output of a thermocouple positioned to sense an operating temperature to an impedance at the output 106 that varies with operating temperature versus that provided by an impedance type temperature sensor.
    As discussed above, this method may include various other processes as identified by dashed boxes and lines in FIG. As illustrated, after receiving the input property in process 202 in process 208, the sensed operating characteristic, such as temperature or pressure, may be determined. After determining the sampled operational characteristic, in process 210, the type and value of the synthesized characteristic related to or associated with the sampled operational characteristic or at least the input characteristic Cin is determined. From these, the pulse width signal Spw is generated to synthesize the synthesized sensor, the characterization and the value at the output 106.
    In some embodiments, one or more additional signals may be received by translation circuit 108, each including a different input property provided by a different type of input device 112. For example, in a thermocouple sensing application, the method may include receiving a compensation signal Scomp from a cold junction compensation circuit 142 as shown in process 212. As noted above, the method may include generating the pulse width of the pulse width signal Spw in response to or in response to the received compensation signal Scomp.
    In some embodiments, the method may include receiving a second input property as in the process 214 from a second input sensor and generating the pulse width signal Spw in the process 204 with a pulse width that varies in response to the received second input characteristic Cin.
    Similarly, a second value of the input characteristic Cin may be provided such that the pulse width signal Spw generated in the process 204 is varied in response to the received second value of the input characteristic Cin. As a result, a second output feature value Cout2 is provided at the output in response to the second pulse width of the process 206.
    In other embodiments, a plurality of input characteristics Cin received with each input characteristic Cin are associated with one of a plurality of input devices 112. In this process, each of the input devices 112 is another type of input device and generates the pulse width signal, which includes generating a pulse width that varies in response to two or more of the received input characteristics Cin.
    In still other embodiments, the pulse width signal Spw is used to generate a control signal Scon as in process 216. The control signal Scon is then used to generate or provide the appropriate input property Cout.
    As discussed in more detail above, in some embodiments, the method may include generating a conversion feedback signal at the output as in the process 218. In this case, the pulse width signal Spw includes generating an 11/25 Austrian Patent Office AT12 807U1 2012-12-15
    Pulse width varying in response to the feedback conversion signal FSCOnV in the process 206. Similarly, in some embodiments, the method may include generating an output control feedback signal at the output as in the process 220. In this case, the output property Cout is provided in the process 206 in response to the output control feedback signal FS0C.
    It is also noted that the method may also include receiving the provided output property and determining the operating characteristic within the operating environment. For example, the operating characteristic may be a temperature measured by a thermocouple. The input characteristic provided by the thermocouple is a voltage of the thermocouple. The device to be synthesized is an RTD that has a resistance that varies in response to temperature. The method receives the voltage from the thermocouple and generates a pulse width signal corresponding to the impedance of the RTD if the RTD had sampled the operating temperature sensed by the thermocouple. Coupled to the adapter circuit is a temperature measuring instrument configured to interface with the particular RTD type of interface to determine the delivered output impedance provided by the adapter circuit. Thereafter, the temperature measuring instrument determines or calculates the sensed operating temperature in response to the determined impedance.
    Referring now to FIG. 7, an operating environment for one or more illustrated embodiments of the adapter assemblies, adapter circuits, and adapter systems as described above may include a processing system 230 having a computer 232 having one or more high-speed processors (such as a central processing unit (CPU)). 234 in conjunction with a memory 128 connected to at least one bus structure 236, an input component 238 connected by an input structure 240, and an output component 242 connected by at least one output structure 244.
    The illustrated processor 234 is a known design, such as in many digital signal processors, and may include an arithmetic logic unit (ALU) 246 for performing calculations, a collection of registers 248 for temporarily storing data and instructions, and a controller 250 to control the operation of the computer 232. Also preferred for the processor 234 is any of a variety of processors, including at least those of Digital Equipment, Sun, MIPS, Motorola / Freescale, NEC, Intel, Cyrix, AMD, Texas Instruments, HP, and Nexgen. The illustrated embodiment operates on an operating system that is designed to be portable to any of these processing platforms.
    The memory 128 generally includes fast main memory 252 in the form of a medium such as random access memory (RAM) and read only memory (ROM) semiconductor devices, and a secondary storage 254 in the form of long term storage media such as such as floppy disks, hard disks, tape, CD-ROM, flash memory and other devices that store data using electrical, magnetic, optical or other recording media. Main memory 252 may also include video display memory for displaying images via a display device. Those skilled in the art will recognize that the memory 128 may include a variety of alternative components and a variety of memory capacities and may be implemented with the processor 234.
    The input component 238 and the output component 242 are also known and can be implemented to local and remote user interfaces such as, for example, a controller, a remote control system, and an operating system. The input device 238 may include the input device 104 such as a keyboard, a mouse, a physical transducer (eg, a microphone), etc., and is provided with an interface device 240 of the processor 234, the latter for programming and operating the computer 232 connected to the computer 232. The output component 242 may include the output circuit 110, or may also include a display, a printer, a transducer (eg, a speaker), and connected to the computer 232 via an output interface 244 be. Some devices, such as a network adapter or modem, can be used as input and / or output components.
    As one skilled in the art will appreciate, the computer system 230 further includes an operating system and at least one application program. The operating system is the amount of software that controls the operation and allocation of the resources of the computer system. The application program is the set of software that performs a task desired by the user using computer resources provided by the operating system. Both are within the illustrated memory 128. As those skilled in the art will appreciate, some of the methods, processes and / or functions described herein may be implemented as software and stored in various types of computer-readable medium as computer-executable instructions. In various embodiments of the adapter circuit or arrangement, the processor may include a robust operation and application program with the computer-executable instructions for controlling the controller and the controlled devices. In addition, it may illustratively include application software programs having computer-executable instructions including a thin-client application for communicating and interacting with one or more external devices.
    In accordance with the practices of those skilled in the art of computer programming, some embodiments are described by the computer system 230 as described herein with reference to symbolic representations of operations. These operations are sometimes referred to as being performed by the computer. It should be appreciated that the operations represented symbolically include the manipulation of electrical signals representing data bits, and the maintenance of data bits at memory locations in the memory 128 as well as the further processing of signals by the processor 234. The memory locations at which the data bits are maintained are physical locations having certain electrical, magnetic, or optical properties corresponding to the data bits. The adapter circuitry may be implemented in a program or programs that include a series of instructions stored in a computer-readable medium. The computer readable medium may be any of the devices or a combination of the devices described above in connection with the memory 128.
    It will be understood by those skilled in the art that some embodiments of the systems or components described herein may include more or less computer processing system components and are further within the scope of the present disclosure.
    In describing elements or features and / or embodiments thereof, the articles " a ", " a ", " the " and " this " mean that there are one or more of the elements or features. The terms " comprising ", " " " and " should be inclusive and mean that there may be additional elements or features beyond those just described.
    Those skilled in the art will recognize that various changes can be made to the exemplary embodiments and implementations described above without departing from the scope of the disclosure. Accordingly, all matter contained in the above description or described in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.
    Of course, the processes or steps described herein are of course not necessarily to be understood as requiring their implementation in the order particularly discussed or illustrated. In addition, of course, additional or alternative processes or steps can be used. 13/25
    权利要求:
    Claims (36)
    [1]
    Austrian Patent Office AT12 807U1 2012-12-15 Claims 1. A temperature sensor adapter assembly comprising: conversion circuitry (108) for receiving an input characteristic of an input temperature sensor (124) and generating a pulse width signal having a pulse width responsive to the received signal Input property varies, is configured; an impedance circuit (130) coupled to the conversion circuit (108) for receiving the pulse width signal coupled to an output (106) and configured to provide an impedance at the output (106) in response to the pulse width of the received pulse width signal and a conversion feedback circuit (144) coupled to the output (106) and the conversion circuit (108) and configured to generate a conversion feedback signal from the output (106), the conversion circuit (108) for receiving the conversion feedback signal and generating of the pulse width signal is configured with a pulse width corresponding to the conversion feedback signal, characterized in that the supplied impedance at the output (106) corresponds to an impedance of a synthesized temperature sensor different from the input temperature sensor.
    [2]
    2. The assembly of claim 1, wherein the input temperature sensor (124) is a thermocouple and the input characteristic is a voltage generated by the thermocouple.
    [3]
    3. Arrangement according to claim 2, wherein the synthesized temperature sensor is an impedance-based temperature sensor.
    [4]
    4. Arrangement according to claim 3, wherein the impedance-based temperature sensor is selected from the group consisting of a resistance temperature detector (RTD) and a thermistor.
    [5]
    The arrangement of claim 2, further comprising a cold junction compensation circuit (142) coupled to the conversion circuit (108) and configured to generate a compensation signal, the conversion circuit (108) for generating the pulse width signal having a pulse width in response to the compensation signal is configured.
    [6]
    6. The assembly of claim 2, wherein the conversion circuit (108) is configured to determine a temperature at a sensing location of the thermocouple in response to the received input property and to generate the pulse width signal having a pulse width in response to the determined temperature.
    [7]
    The arrangement of claim 1, wherein the conversion circuit (108) includes a processor (126) and a computer-readable medium (128) having computer-executable instructions configured to generate the pulse width signal.
    [8]
    8. The arrangement of claim 1, wherein the impedance circuit (130) has an output control circuit (132) configured to receive the pulse width signal and generate an output control signal, and an impedance device (134) to receive the output control signal and to change the impedance the output (106) is configured in response to the output control signal.
    [9]
    The arrangement of claim 8, wherein the output control circuit (132) includes a circuit selected from the group consisting of an operational amplifier (152) and a linear filter and configured to generate a DC signal as the output control signal. 14/25 Austrian Patent Office AT12 807U1 2012-12-15
    [10]
    The arrangement of claim 8, wherein the output control circuit (132) is an operational amplifier (152) configured to receive the pulse width signal at an inverting input, further comprising an output control feedback circuit (146) coupled to the output (106 and coupled to the output control circuit (132) and configured to generate an output control feedback signal from the output (106), wherein the operational amplifier (152) is configured to receive the output control feedback signal at a non-inverting input.
    [11]
    The arrangement of claim 8, wherein the output control circuit (132) includes an integration circuit that integrates the pulse width signal with a reference signal and / or with an output control feedback signal.
    [12]
    The arrangement of claim 8, wherein the impedance device (134) includes a transistor (154) having a gate for receiving the control signal, and wherein the output impedance across a drain and a source of the transistor (154) in response to the gate being the gate Control signal received, is delivered.
    [13]
    13. The arrangement of claim 8, further comprising an output control feedback circuit (146) coupled to the output (106) and to the output control circuit (132) and configured to generate an output control feedback signal from the output (106). wherein the output control circuit (132) is configured to generate the output control signal in response to the output control feedback signal.
    [14]
    14. The arrangement of claim 1, wherein the conversion circuit (108) is configured to determine a sensed temperature in response to the received input property and to generate the pulse width signal having a pulse width in response to the sensed temperature.
    [15]
    The arrangement of claim 14, wherein the conversion circuit (108) is configured to generate the pulse width signal having a pulse width corresponding to the impedance of the synthesized temperature sensor sensing the sensed temperature.
    [16]
    16. The arrangement of claim 1, wherein the conversion circuit (108) is configured to generate the pulse width signal at a substantially constant pulse rate.
    [17]
    17. The arrangement of claim 1, wherein the conversion circuit (108) is configured to receive a plurality of input characteristics, each received from one of a plurality of input temperature sensors (124), and to generate the pulse width signal having a pulse width in response to two or more of the received input characteristics ,
    [18]
    18. The assembly of claim 17, wherein the conversion circuit (108) is configured to determine the impedance of the synthesized temperature sensor in response to two or more of the input characteristics and to generate the pulse width signal having a pulse width in response to the particular synthesized impedance.
    [19]
    The arrangement of claim 18, wherein the two or more input characteristics are two or more voltages received from two or more different types of thermocouples.
    [20]
    20. A temperature sensor adapter system comprising: an input (104) for receiving an electrical signal from a thermocouple; an output (106) for coupling to an input of a temperature measuring instrument (116), the temperature measuring instrument (116) configured to receive input from an input temperature sensor (124) for determining a sensed temperature; a processor (126) coupled to the input (104) for receiving the electrical signal, the processor (126) for generating a pulse width signal having a pulse width configured in response to the received electrical signal is configured; a control circuit (132) coupled to the processor (126) and configured to receive the pulse width signal and convert the pulse width signal into a control signal in response to the pulse width of the received pulse width signal; an impedance device (134) coupled to the control circuit (132) for receiving the control signal and configured to provide an impedance at the output (106) in response to the control signal, the supplied impedance corresponding to an impedance of an impedance-based temperature sensor characterized in that it comprises: an output control feedback circuit (146) coupled to the output (106) and the control circuit (132) and configured to generate an output feedback signal from the output (106), the control signal being responsive to the output control Feedback signal responds.
    [21]
    The system of claim 20, further comprising a cold junction compensation circuit (142) coupled to the processor (126) and configured to generate a compensation signal associated with a cold junction of the thermocouple, the processor (126) for receiving the compensation signal and configured to generate a pulse width signal having a pulse width that varies in response to the compensation signal.
    [22]
    22. The system of claim 20, further comprising a computer-readable medium (128) coupled to the processor (126) and having computer-executable instructions for determining a temperature associated with the received electrical signal and generating the pulse width signal having a pulse width, which is configured in response to the particular temperature.
    [23]
    23. The system of claim 20, further comprising a translation feedback circuit coupled to the output and to the processor and configured to generate a conversion feedback signal from the output, wherein the processor is coupled to the processor Generating the pulse width signal having a pulse width that varies in response to the conversion feedback signal.
    [24]
    24. A temperature sensor adapter circuit comprising: means for converting an input characteristic received at an input (104) from a temperature sensor configured to sense a temperature (124) into a pulse width signal having a pulse width responsive to the received input characteristic varies; Means for providing an output characteristic at an output (106) corresponding to a property of a synthesized temperature sensor and responsive to the pulse width of the pulse width signal, wherein the synthesized temperature sensor is different than the input temperature sensor (124), characterized by comprising: means for Generating an output control feedback signal from the output (106), wherein the means for providing is responsive to the output control feedback signal.
    [25]
    The circuit of claim 24, further comprising means for generating a conversion feedback signal from the output (106), the means for converting including means for generating the pulse width signal having a pulse width that varies in response to the conversion feedback signal. 16/25 Austrian Patent Office AT12 807U1 2012-12-15
    [26]
    The circuit of claim 24, further comprising means for generating a conversion feedback signal from the output (106), the means for converting including means for generating the pulse width signal having a pulse width that varies in response to the conversion feedback signal.
    [27]
    27. The circuit of claim 24, wherein said means for converting comprises means for receiving a plurality of input characteristics of a plurality of input sensors (124), each configured to sample an operating characteristic, and means for generating a pulse width signal having a pulse width responsive to two or more of the received input characteristics varies, is configured.
    [28]
    28. A method of sensing a temperature, the method comprising: receiving a voltage generated by a thermocouple sensing an operating temperature, generating a pulse width signal having a pulse width that varies in response to the received voltage; Providing an impedance at an output (106) that varies in response to the pulse width of the pulse width signal and that corresponds to an impedance of an impedance-based temperature sensor (124) that samples the operating temperature; characterized in that it further comprises: generating an output control feedback signal from the output (106), wherein providing the output impedance includes providing the impedance in response to the output control feedback signal.
    [29]
    The method of claim 28, further comprising generating a conversion feedback signal from the output (106), wherein generating the pulse width signal includes generating a pulse width that varies in response to the conversion feedback signal.
    [30]
    30. The method of claim 28, wherein providing the output impedance includes receiving the pulse width signal and generating a control signal in response to the pulse width of the received pulse width signal; and further comprising receiving the control signal at an impedance device (134) coupled to the output (106) and configured to vary the impedance at the output (106) in response to the control signal.
    [31]
    The method of claim 28, further comprising receiving an output reference signal associated with the output (106), wherein generating the control signal includes integrating the pulse width signal with the output reference signal.
    [32]
    32. The method of claim 28, further comprising receiving a compensation signal from a cold junction compensation circuit, wherein generating the pulse width signal includes generating a pulse width of the pulse width signal that varies in response to the received compensation signal.
    [33]
    33. The method of claim 28, wherein the received voltage has a first voltage value, the pulse width has a first pulse width, and the output impedance has a first output impedance value, the method further comprising: receiving the voltage with a second voltage value from the thermocouple, generating the Pulse width signal having a second pulse width that varies in response to the second voltage value; and providing a second impedance at the output in response to the second pulse width.
    [34]
    34. The method of claim 28, further comprising measuring the output impedance and calculating the temperature in response to the measured output impedance. 17/25 Austrian Patent Office AT12 807U1 2012-12-15
    [35]
    35. The method of claim 28, wherein receiving includes receiving a plurality of voltages each generated by one of a plurality of thermocouples, and generating the pulse width signal comprises generating a pulse width that varies in response to two or more of the received voltages , contains.
    [36]
    A method according to claim 35, wherein two or more of the thermocouples are of different thermocouple types. For this 7 sheets drawings 18/25
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    同族专利:
    公开号 | 公开日
    WO2007136855A2|2007-11-29|
    JP2009537848A|2009-10-29|
    AT544056T|2012-02-15|
    EP2027443A2|2009-02-25|
    WO2007136855A3|2008-12-18|
    US20070268957A1|2007-11-22|
    EP2027443B1|2012-02-01|
    US7496469B2|2009-02-24|
    JP4830021B2|2011-12-07|
    DE202007019316U1|2011-10-26|
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