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  • 专利说明
  • 权利要求
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    • 专利摘要:
    Power manager for prototype electronic device with current limit feedback control loop modification to stabilize an external power supply. A portable electronic device has a battery to provide power to operate the device, including a connector of a power supply terminal to be connected to an external power source, and a power manager with a battery charger circuit that receives power. through the power supply terminal to charge the battery. The power manager has a current limit feedback control loop that limits the current consumed according to a predetermined current output rate from the external power supply. The manager automatically changes the behavior of its control cycle to stabilize the operation of the coupled external power supply. Other embodiments are also described and claimed.
    公开号:BR112012026012B1
    申请号:R112012026012
    申请日:2011-04-12
    公开日:2019-12-03
    发明作者:Yu John Tam Ching
    申请人:Apple Inc；
    IPC主号:
    专利说明:

    Invention Patent Descriptive Report for "PORTABLE ELECTRONIC DEVICE, METHOD FOR CONTROLLING A CURRENT LIMIT FEEDING CONTROL CYCLE PROCESS IN A PORTABLE ELECTRONIC AND ENERGY MANAGER DEVICE".
    [1] One embodiment of the invention relates to signal and / or power conditioning techniques in a portable electronic device to automatically stabilize a coupled external power supply.
    BACKGROUND
    [2] Many portable electronic devices, such as portable wireless communication devices (mobile phones or smartphones) and notebook or laptop personal computers have built-in, switching power supply circuits that are powered by an external power source. For example, when an AC power adapter having a regulated output is connected to a smartphone, a power switching circuit on the smartphone draws current from the connected power adapter, and produces the voltage necessary to charge the device's battery and / or for the operation of the rest of the device's components. The way in which the power supply switching circuit draws current, however, creates a negative impedance load. As a result, the external power source sometimes behaves abnormally, for example, its normally stable DC output goes out of regulation, exhibits excessive undershoot and / or overshoot, and may even oscillate .
    SUMMARY
    [3] One embodiment of the invention is a portable electronic device having a battery to provide power to operate the device and a connector including a power supply terminal to be connected to an external power source. The device also has a power management circuit. The power manager consumes power through the power terminal of the attached external power supply, to charge the battery (for example, using a power switching circuit). The power manager has a current limit feedback control cycle that limits the current consumed according to a predetermined current output rating from the external power source (for example, by controlling a series pass transistor) . The power manager automatically changes the behavior of the feedback control cycle to help stabilize the operation of the attached external power supply.
    [4] The power manager can change the behavior of the control cycle by modifying its frequency response from the circuit.
    [5] The power manager can also change the behavior of the control cycle, changing a bias current from an error amplifier used in the control cycle, for example, to increase or decrease the control cycle bandwidth.
    [6] The power manager can also change the frequency response of a filter in the control cycle to change a resonant frequency in the control cycle. This filter can be a control signal filter, for example, a digital filter, or it can be a power line conditioning filter.
    [7] In another mode, the power manager can signal that a predetermined impulse load is applied to the supply terminal. The response of the external power supply coupled to the impulse load is then measured, and based on this the behavior of the control cycle can be changed. For example, the power manager can calculate a resonant frequency of the coupled external power source based on the measured response, and on that basis change the control cycle behavior, for example, by changing the control cycle bandwidth to avoid the calculated resonant frequency.
    [8] The above summary does not include an exhaustive list of all aspects of the present invention. It is contemplated that the present invention includes all systems and methods that can be practiced from all suitable combinations of the various aspects summarized above, as well as those revealed in the Detailed Description below and particularly noted in the embodiments filed with the application. These combinations have particular advantages not specifically mentioned in the summary above.
    BRIEF DESCRIPTION OF THE DRAWINGS
    [9] The modalities of the invention are illustrated by way of example and not by way of limitation in the figures in the accompanying drawings, in which similar references indicate similar elements. It should be noted that references to "one" of the embodiment of the invention in the present description are not necessarily the same, and mean at least one.
    [10] Figure 1 shows two scenarios of a portable device attached to an external power supply.
    [11] Figure 2 is a schematic circuit of the external power supply and the portable device as they are connected to each other, including certain relevant components of each.
    [12] Figure 3 is a combined schematic circuit and block diagram of a power manager for the handheld device, in which an example of the current limit feedback control cycle is shown as being adjusted or controlled according to a embodiment of the invention.
    [13] Figure 4 is a combined circuit diagram and block diagram of another example of the current limit feedback control cycle.
    [14] Figure 5 is a schematic diagram of the combined circuit and block diagram of yet another example of the current feedback control cycle limit.
    [15] Figure 6 is an example of an algorithm for digital signal processing to adjust the current limit feedback control cycle.
    DETAILED DESCRIPTION
    [16] Various embodiments of the invention with reference to the accompanying drawings are now explained. Whenever the shapes, relative positions and other aspects of the parts described in the modalities are not clearly defined, the scope of the invention is not limited only to the parts shown, which are intended for the purpose of illustration only. In addition, although numerous details are presented, it is understood that some embodiments of the invention can be practiced without these details. In other cases, well-known circuits, structures and techniques have not been shown in detail so as not to obscure the understanding of this description.
    [17] As summarized above, a modality of the invention is a technique that can help to stabilize an external power source, which is coupled to a portable device, by modifying the behavior of a current limit control cycle of the device, but without actually impairing its current limiting function. For a better perspective of the invention, consider the different technique below that can also help to stabilize an external power supply. The voltage spectrum (DC above and in a predetermined frequency range of interest) at the input of a switching circuit of the power supply in the portable device (and which is powered by the external power supply) is monitored. While doing this, also the current spectrum being drawn from the external power supply is adjusted so that the load presented to the external power source becomes a positive (or linear) impedance. In some cases, however, this linearization of the load is not sufficient to stabilize the external power supply, particularly when the latter can be a switching voltage regulator (switching). One embodiment of the invention is a different adjustment, which can be made on the portable device, which can be used alone or in combination with load linearization, to help stabilize the external power supply.
    [18] Figure 1 shows several different scenarios of a portable device (PD) 10 coupled to an external power supply (EPS) 18, for the purpose of charging a battery (not shown) of the PD. The term "battery" is used here generically to include not only conventional electrochemical cell systems, but also fuel cell systems suitable for use in the PD 10. The PD-10 is an electronic consumer device that works by battery that can be easily carried by its user in one hand. It can provide one or more of the following electronic functions for its user: two-way communications in real time or live wirelessly (generically referred to as audio telephony or mobile video); messaging, web browsing and web-based services; navigation; compass; calendar application; still and video camera; digital photography application; word processor application; spreadsheet application; group presentation application; audio and video recording; digital media player, including audio and video, and video games (video games). The PD 10 has a box in which its various electronic circuit components are integrated, which are well known to those of ordinary skill in the art as being necessary to provide any one or more of the above functions.
    [19] In figure 1, two examples of PD 10 are shown. In one example, the PD 10 is coupled to a desktop personal computer via a set of peripheral communication interface cable 12. The desktop computer (desktop) can be powered by plugging it into an AC wall outlet, as shown. In another example, the PD 10 is coupled to the EPS 18 as a wall outlet power adapter unit. In yet another example (not shown), EPS 18 can be an auto-power adapter / cigarette lighter unit or a laptop / notebook.
    [20] In one example, cable assembly 12 has a cable connector 11 on the PD side which is designed to correspond with an integrated connector on the PD 10 (not shown), in addition to an cable connector on the EPS side 13. The latter would be connectable with a corresponding connector embedded in EPS 18. Cable assembly 12 may, for example, comply with a computer peripheral communications interface specification, such as Universal Serial Bus (USB) or other suitable alternative for communicating with a peripheral device. The communications interface can also be referred to as a communication bus. Note that in another example, cable assembly 12, although it has connector 11 on the PD side, does not have connector 13 on the corresponding EPS side. In this case, the wires in the cable assembly 12 can be connected in a circuit inside the EPS 18 box.
    [21] In EPS 18, there is an EPS 15 power supply circuit (also referred to here as the external power supply 15). The external power supply 15 can be a switch mode voltage regulator that provides a regulated DC output voltage. This can be achieved through an AC to DC converter, in the case of an AC wall adapter unit, or a DC to DC converter, in the case of a cigarette lighter adapter or a desktop personal computer, depending on the type input power.
    [22] In PD 10, an energy management circuit 3 is integrated inside, which is responsible for adjusting the amount of energy that is consumed in PD 10 (and that can be consumed from external power supply 15) in order to to make more efficient use of energy to conserve battery power and / or avoid thermal situations. For example, the power manager can perform a combination of one or more of the following control functions: backlighting a display screen, turning the hard disk; sleep and wake up, battery charges; trackpad control, entry / exit during sleep, and other PD 10 functions that have a substantial impact on energy consumption. These can be based on algorithms that are executed by a data processing component of the energy manager 3, for example, a microcontroller. Power manager 3 can also be seen as including a power supply circuit (both power and control components), such as any one or more of the following: a battery charger circuit, a CC-DC switch and / or linear voltage regulator, and a boost converter. The power manager 3 can also include a sensor circuit, including an A / D converter, to help it perform functions, such as temperature regulation and temperature management, by adjusting the energy consumption of a component in PD 10, in response to the temperature sensor on PD 10.
    [23] In one embodiment, power manager 3 has a power supply switching circuit that consumes power from the external power supply 15, in this case via a power terminal (P) or power supply line from connector 11 , and charges the battery - essentially operating as a switched battery charge circuit. Power manager 3 can also have the additional function of extracting power from external power supply 15 to power (operate) essentially the rest of the components of PD 10. This can be accomplished using one or more regulating circuits for linear power supply or switched, whose outputs supply power to all other components of the PD 10 (eg main logic board, display screen, touchscreen, trackpad, hard disk drive, RF power amplifiers, etc.). Power manager 3 can be a packaged integrated circuit (chip), a multi-chip module, or a combination of several packaged integrated circuits and discrete devices, installed on a printed circuit board inside a PD 10 main housing.
    [24] Turning now to Figure 2, a schematic diagram of the EPS 18 circuit and the PD-10 as they are coupled to each other is shown, including certain relevant components of each. The cable end connector 11 is used to separate, for the purposes of this discussion, the side of the handheld device from the side of the external power supply (EPS), as shown. Connectors 11 fit with a connector 20 on the PD side, which has at least one data terminal (in this example, a pair of data terminals D1, D2) and a pair of power (P) and return (R) terminals . The last pair is mainly used to supply power to the PD-10, while the data terminals are used mainly to conduct signaling and data transfer information. The data transfer and signaling is conducted by a phy bus 23 on the EPS side, and a corresponding phy bus 22 on the PD side. A phy bus is the physical layer interface of a given communication bus, which is used to connect the EPS and the PD. For example, the phy bus can comply with any existing communication bus specification, for example, USB or another suitable alternative for the communication of peripheral devices in consumer electronic devices.
    [25] In this example, the EPS side also contains an EPS 25 identification generator which can be separated from the phy 23 bus. The EPS 25 identification generator allows the EPS 18 manufacturer to identify various attributes of EPS 18, including its type or model, serial number and / or certain characteristics of your external power supply 15, such as your output power from the current, current, and / or voltage rating (on lines P and R) . The latter information can be signaled on a D1 or D2 data line of the communications bus, which is then recognized by an EPS 21 identification decoder on the PD side and then used by the power manager 3 to determine how to control energy consumption in the PD. In particular, power manager 3 can use the recognized power output rates of the external power supply to limit the absorbed current or energy in the power line, as well as monitor the state of the voltage in the power line, as described below to stabilize the operation of the external power supply. Any conventional technique for transferring power supply attributes between the EPS 25 identification generator and the EPS 21 identification decoder can be used, including an analog signaling approach in which pull-up or pull-down resistors on a data line (whose resistance values are associated with the respective energy or current limits) are selected and configured in generator 25, which are then detected in decoder 21.
    [26] Note that for the sake of convenience, any reference here to an "output current rate" of the external power supply 15 should be understood as, alternatively, being an "output energy rate", since that the two are related by the power = current * voltage relationship.
    [27] Power manager 3 contains a battery charger circuit that receives power through the power supply terminal (P) to charge battery 24. In this example, power manager 3 draws current through a protection circuit overvoltage / reverse voltage protection (OVP / RVP) 27, and a power supply line conditioning (LC) filter 28. OVP / RVP 27 prevents the voltage at its output from exceeding a predetermined limit (for example, due to an electrostatic discharge event or an inversion of polarity). The LC 28 filter includes one or more analog filter components, such as a series step inductor and a shunt capacitor, which perform a low step filter function over the power supply line, before input to the manager energy consumption 3. The power consumed can also be used to power all other components of the PD 10, including the main logic board, RF power amplifiers, display screen, etc. The power manager 3 controls the amount of current allocated to charge the battery 24 and the rest of the components of the PD 10, so as not to exceed the predetermined output capacity of the external power supply 15 (as determined by the Identification decoder) EPS 21). This is accomplished using a current limit feedback control cycle. To help stabilize the operation of the coupled EPS 15, power manager 3 automatically changes the behavior of its current limit feedback control cycle. These aspects are explained in detail below.
    [28] Turning now to figure 3, a combined circuit diagram and block diagram of power manager 3 is shown, in which an example of a current limit feedback control cycle 31 is represented. In this case, the energy consumed through the line conditioning filter 28 passes through a series pass transistor 34, before being divided between a battery charger 30 and a switched power supply 29. The latter can be used to power an RF power amplifier and / or other components of the PD 10 (including, for example, all components other than the battery), while the battery charger 30, which can be of the linear or keyed type of charger, is responsible for bringing the battery to a fully charged state.
    [29] In addition to the series pass transistor, the current limit feedback control cycle 31 also includes a current measurement circuit 32 that takes a measure of the current in the power supply line (which powers the power manager energy and its control grid 31). This can be a measure of the DC current at a given time, which is then repeated over time as the PD 10 operates with the external power supply 15 coupled (see figure 2). The measured DC current can be detected, or can be estimated through a calculation. For example, the current can be detected by obtaining the voltage through a series pass resistor, or it can be detected by means of a magnetic current circuit placed around the power supply line. As an alternative, the current measurement circuit 32 can be signaled the current measurement by the external power supply 18 itself (for example, using EPS 25 identification generator and in data lines D1, D2 - See figure 2). In any case, the measured current is compared by a comparator circuit 33 against a current reference level. The latter may have previously been recognized by the EPS 21 identification decoder (see figure 2), with an output current rate predetermined by the external energy source or derived from a power rate. The predetermined output current rate can be a specified maximum power or steady state current (which can be indicated by the external power supply). The error or difference between the measured current and the reference current is then filtered or decoded by a signal filter / decoder control cycle 35, before being used to drive a series pass transistor control electrode 34 The current limit feedback control cycle 31 periodically samples current from the power supply line and in response adjusts the series pass-through transistor 34 to ensure that the predetermined output rate is not exceeded. This technique can allow the battery charger 30 and the switched power supply 29 to operate independently of the current limit feedback control cycle 31. In contrast, as explained below with reference to figures 4 and 5, there are other embodiments of the invention , in which the battery charger 30 and / or the switched power supply 29 are not independent of the current limit control cycle, but rather respond to the signals from the filter / decoder 35 in order to limit the overall DC current. in the power supply line.
    [30] Seen otherwise, control cycle 31 is a closed feedback control cycle that continuously monitors the DC current in the power supply line and, as defined by the frequency response or filter / input / output characteristics. decoder 35, modulates the pass-through transistor 34 in order to maintain the highest possible voltages downstream of the pass-through transistor 34, while at the same time, not exceeding the current output rate of the external power supply.
    [31] According to an embodiment of the invention, the "normal" behavior of the current limit feedback control cycle 31 is adjusted or modified by a stabilization controller 37 acting in real time, or continuously, to assist stabilize the external power supply. In one embodiment, as illustrated in figure 3, this is done using a digital signal processing circuit (DSP) 39 running an algorithm that uses the voltage spectrum measured on the power supply line as input (in this case, through an analog to digital converter (ADC) 38 to digitize the voltage of the power supply line downstream of the line conditioning filter 28 and before or upstream of the battery charger 30 and switched power supply 29). The DSP circuit 39 analyzes the voltage in real time, and on that basis it immediately changes the behavior of the control cycle 31 in response to detecting, for example, that the external power supply is operating outside its voltage specifications. For example, the DC voltage on the power supply line may be fluctuating, transient, (overflow and subnormal outputs), and / or overvoltage or undervoltage (that is, the steady-state DC voltage is outside its regulated interval).
    [32] Seen otherwise, the power manager, and in particular controller 37, monitors the voltage of the power supply line, to find any indication that the attached external power supply is functioning abnormally or unstable way. In response to the detection of such an event, controller 37 changes the behavior of control circuit 31, modifying its loop frequency response. This can be done, for example, by changing a bias current of an error amplifier, which is part of comparator 33 (see figure 3). The signaling of this change in the bias current can be designed to increase or decrease the bandwidth of the control cycle 31, which is the speed at which the control circuit responds to changes in the voltage of the controlled supply line. Thus, the comparator 33 can include such an error amplifier, whose current bias variable can be increased or decreased in order to change the loop bandwidth. It is expected that by changing the circuit bandwidth in this way, the actual AC load presented to the external power source will be modified in order to make the AC load appear more acceptable to the regulation circuit of the external power supply. As suggested above, this change to the response of the frequency return limit current control cycle can be used in conjunction with other techniques known in the art than the attempt to linearize the AC load presented to the external power supply.
    [33] Another "button" that can be transformed into the current feedback limit control loop 31 (to help stabilize the external power supply) is the frequency response of the filter signal decoder control 35. The filter 35, which can be an analogue or a digital bandpass filter, depending on the application, has a response frequency that can be modified by controller 37, in order to change the resonance frequency of control cycle 31. filter 35 is in a control signal path of circuit 31, in such a way that modifying the taps or coefficients of your digital filter results in a change in the resonance frequency of the global circuit 31. The change in resonance frequency is designed to avoid a resonant frequency from the attached external power supply. By forcing the difference between the resonance frequency of the control cycle 31 and that of the external power supply, the probability of a potentially unstable voltage signal being generated (for example, an oscillation, overflow or subnormal output) on the line power supply is reduced.
    [34] Yet another way, in which the resonance frequency of the control cycle 31 can be changed (in order to distance it from the resonance frequency of the external power supply) is to change the frequency response of the line conditioning of the filter power supply 28. Thus, in one mode, the controller 37 has an output that controls a parameter or characteristic of the line conditioning filter 28 in order to change the response of this last frequency (still keeping its total low pass filtering or ripple reduction function), in a way that alters the resonance frequency of the control cycle 31 (in order to avoid that of the external power supply).
    [35] In view of the above, one embodiment of the present invention can be a computer-readable medium, such as integrated circuit or mass storage memory (inside the portable device), which has instructions stored therein, which program one or more data processing components (hereinafter referred to as a "processor") to perform a portion of the operations of the DSP circuit 39 described above. In other embodiments, some of these operations can be performed by specific hardware components that contain solid state logic modules. These operations can alternatively be carried out using any combination of programmed data processing components and fixed connected circuit components.
    [36] Referring now to Figure 4, a combined circuit diagram and block diagram of another example of the current limit feedback control cycle 31 is depicted. In this embodiment, the current measurement circuit 32, comparator 33, and a filter / decoder 35 can operate in much the same way as in the case of figure 3, except that there is no separate pass-through transistor in series 34 on the line power supply (upstream of charger 30 and switching power supply 29). Instead, the current limitation is achieved, in this case, by directly controlling the supply circuits that are in the power supply line, in this case, the battery charger 30 and the switching power supply 29, so that the totals current drawn on the line power supply remains at or below the current reference level. Here, the filter 35 / decoder has an output that provides a control signal to the battery charger 30, which indicates that, for example, the battery charge current should be reduced (to ensure that the total current in the power supply does not exceed the predetermined threshold). Likewise, the filter 35 / decoder could otherwise switch signal source 29 to reduce its attraction of the total current in the power supply line (for example, in favor of the battery charger 30 to pull more current, in order to, for example, charge the battery faster). Such decisions can be made by the filter 35 / decoder according to conventional energy management techniques for portable devices. The rest of the power manager that is illustrated in figure 3, namely, controller 37 (having ADC 38 and DSP circuit 39), which acts to adjust the current limit control feedback of circuit 31, is not repeated in figure 4 , in the interest of brevity, but is understood to be present, to provide the necessary adjustments, in order to stabilize the external energy supply.
    [37] Figure 5 shows a combined circuit diagram and block diagram of another example of the current feedback loop control limit 31. In this case, the power line only ends at battery charger 30, in such a way that the supply power circuits other PS 1, PS 2, etc. in the portable device there is DC coupled to the positive node of the battery charger 30 that supplies current to recharge the battery. In contrast, the arrangement of figure 3 would require an additional switching power circuit (downstream of the battery charger) that directly couples the positive battery node to all other power supply circuits of the handheld device. Returning to figure 5, the current limit of the supply control cycle 31 in this mode operates in general similar to the others, except that, again, there is no requirement for a passage of the series 34 transistor (see figure 3) separated from the battery charger 30 itself. The output of the decoder / filter 35 provides a control signal that commands the battery charger 30 to limit the amount of current that it is based on the supply line. Again, this control signal is based on the 35 / decoder filter having determined that a specified maximum DC current has been reached in the power supply line.
    [38] Now with reference to figure 6, an example of an algorithm for the DSP 39 circuit to adjust the feedback control cycle limit current 31 is shown. The algorithm has at least two inputs, namely the voltage signal measured on the supply line (P), and a specification line voltage supply. The latter can be read from or transmitted by the attached external power supply, or it may have been previously programmed or stored in the portable device at the time of manufacture. The algorithm includes a decision circuit 45, which determines whether the line voltage power supply is stable. This may include simply determining whether a measured DC voltage signal is regulated within the DC voltage range of the specification. Decision circuit 45 can alternatively obtain input from several other blocks that analyze a measured AC voltage signal, that is, an overflow detection block 41, a subnormal output detection block 42, and a block of overflow oscillation detection 43. As their names suggest, these blocks can perform digital signal processing on the measured voltage signal and, in particular, the AC voltage spectrum (across an expected operating frequency range), to detect a overtaking situation, a subnormal exit situation, or an oscillation of sufficiently high magnitude. If any of these "problems" are detected, the supply line voltage is considered unstable, in response to which the algorithm modifies the behavior of the limit feedback control cycle current (block 46). Here again, the algorithm can take one or more of the following options to solve the problem encountered: changing one or more parameters of the control signal of the filter / decoder 35, changing the polarization of the error amplifier in comparator 33, and / or change one or more parameters of the conditioning analogue of the filter power supply line 28 (see figure 3). As explained above, this modification in the control cycle process can be considered as changing the loop response frequency, without affecting the DC current limiting function of the re-limiting current regulation circuit. The change in control cycle behavior can also be seen as the change in circuit bandwidth of the closed loop control feedback process. Note that such changes can be set to be relatively small increments, so that the total DC of the current limiting function of the regulation circuit is not substantially impaired. Due to the real-time or continuously functioning nature of the algorithm, forcing small changes in this way can be effective in yielding only the minimum change in behavior that is necessary in order to remove the instability detected in the supply line voltage.
    [39] The process described above for controller 37 to adjust or modify the behavior of the current limit feedback control cycle process can operate "in the background", that is, continuously during normal handheld operation and be imperceptible to the end user of the device. In some cases, however, it may be desirable to make relatively infrequent changes to the control cycle process, or to anticipate potential supply line instability. This can be accomplished by first stimulating the external power supply in order to induce a response from it (a voltage response in the power supply line), to obtain information regarding the potential for instability in the power supply line. For example, the stabilization controller 37 may be able to signal the battery charger 30 and / or the power supply supply 29 (see figure 3) to apply a predetermined load to the power supply line, in order to extract a response of the external power supply. This predetermined load can be an impulse-type load, as one typically used to measure the response of a conventional voltage loop regulator. Controller 37 will then measure the response in the manner previously described (including, for example, taking a measurement of the AC voltage spectrum on the power supply line) and then analyzing the measured response to determine a characteristic of the external power supply. In particular, controller 37 can use the measured response data to calculate a resonant frequency from the external power supply, for example, by detecting the frequency of oscillations observed in the measured response. Controller 37 then modifies control cycle 31 based on the analyzed response. For example, controller 37 may change the width of the control loop 31 to avoid the calculated resonant frequency. This ability to stimulate the external power supply and measure its response can be an autonomous algorithm for the DSP 39 circuit, or it can be added to the algorithm illustrated in figure 6 to be performed, for example, only occasionally, in order to verify a previous modification made in the current limit feedback control cycle process.
    [40] Although certain modalities have been described and shown in the accompanying drawings, it should be understood that such modalities are merely illustrative of and not restrictive throughout the invention, and that the invention is limited to specific elaborations and arrangements shown and described, once that various other modifications may occur for those of ordinary skill in the art. For example, although figure 3 shows how the control cycle of the current limit feedback 31 is adjusted by a DSP circuit 39 that monitors a digitized version of the voltage of the power supply line, this can alternatively be accomplished using a control circuit. purely analogous control and monitoring (for controller 37). In addition, although the PD 10 illustrated in figure 1 is a multi-function mobile phone (smartphone), the invention is applicable to other types of portable device, for example, laptop / notebook computers, tablet computers, dedicated navigation devices, media digital players, cell phones and personal digital assistants. The description is thus seen as illustrative rather than limiting.
    权利要求:
    Claims (14)
    [1]
    1. Portable electronic device (10), comprising: a battery (24) to supply power to operate the device (10); a connector (20) including a power supply terminal to be coupled to an external power supply (15); and a power manager (3) having a battery charger circuit that draws power through the power supply terminal to charge the battery (24), the power manager (3) having a current limit feedback control cycle (31) which limits the current consumed according to a predetermined output current rate of the external power supply (15), characterized by the fact that the power manager (3) must automatically change the behavior of the control cycle (31 ) by one of a) modifying your cycle frequency response and b) changing a bias current from an error amplifier to one of increasing and decreasing the control cycle bandwidth to stabilize the operation of the external power supply ( 15) coupled.
    [2]
    2. Portable device (10), according to claim 1, characterized by the fact that the energy manager (3) must change the behavior of the control cycle (31) in response to knowing that the external power supply (15 ) is operating outside its voltage specifications.
    [3]
    3. Portable device (10), according to claim 1, characterized by the fact that the power manager (3) must change the behavior of the control cycle (31) in response to the voltage monitoring of the power supply terminal , where the monitoring indicates that the connected external power supply (15) is functioning abnormally.
    [4]
    4. Portable device (10), according to claim 1, characterized by the fact that the energy manager (3) must change the frequency response of a filter to change the resonance frequency of the control cycle (31).
    [5]
    5. Portable device (10), according to claim 1, characterized by the fact that the energy manager (3) must signal that a predetermined impulse load is applied on the power supply terminal, measure the response of the external power supply (15) coupled to the impulse type load, and based on this change the behavior of the control cycle (31).
    [6]
    6. Portable device (10) according to claim 5, characterized by the fact that the energy manager (3) must calculate the resonant frequency of the external power supply (15) coupled based on the measured response, and based on this change the behavior of the control cycle (31).
    [7]
    7. Portable device (10) according to claim 6, characterized by the fact that the energy manager (3) must modify the behavior of the control cycle (31) by changing the bandwidth of the control cycle (31) to avoid the calculated resonant frequency.
    [8]
    8. Method for controlling a current limit feedback control cycle process (31) on a portable electronic device (10), comprising the steps of: measuring current and voltage from the power supply on a portable electronic device (10) , in which the voltage and current of the power supply are obtained from an external power supply (15), which is coupled to the portable electronic device (10); comparing the measured current of the power supply with a threshold, where the threshold represents a maximum of steady state current available from the external power supply (15); adjust the current of the power supply based on the comparison, where the measurement, comparison and adjustment are part of a current limit feedback control cycle process; analyze the measured power supply voltage to determine whether or not the external power supply (15) is operating outside its specifications; and characterized by modifying the control cycle process (31) based on the analysis by one of a) modifying the frequency response of the process cycle and b) changing a bias current from an error amplifier used by the process, to one among increasing and decreasing the process bandwidth.
    [9]
    Method according to claim 8, characterized by the fact that it further comprises: applying a predetermined load to the coupled external power supply (15) to produce a response from the external power supply (15); measure the response; and analyzing the measured response to determine a characteristic of the external power supply (15), in which the control cycle process (31) is further modified based on the analyzed response.
    [10]
    10. Method, according to claim 9, characterized by the fact that the analysis of the measured response comprises: calculating a resonant frequency of the external power supply (15) coupled based on the measured response.
    [11]
    11. Method, according to claim 10, characterized by the fact that the modification of the control cycle process (31) comprises: changing the process bandwidth, to avoid the calculated resonant frequency.
    [12]
    12. Power management circuit (3), comprising: a current limit feedback control cycle circuit to limit the DC current in a power supply line; a battery charger circuit for charging a battery (24) using part of the current D; and characterized by a controller circuit to monitor the voltage in the power supply line and, in response, signal a change in behavior of the control cycle circuit (31), without affecting the DC current limiting function of the power cycle circuit control (31) by one of a) modifying the frequency response of the process cycle and b) changing a polarization current from an error amplifier used by the process, to one among increasing and decreasing the process bandwidth.
    [13]
    13. Power management circuit (3), according to claim 12, characterized by the fact that the control circuit must signal that a predetermined load is applied to the power supply line, in which the voltage being monitored is a response applied load.
    [14]
    14. Power management circuit (3), according to claim 13, characterized by the fact that the control circuit must calculate a resonance frequency based on the monitored voltage, and in which the modification is designed to remove a frequency of resonance of the control cycle circuit (31) of that calculated.
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    同族专利:
    公开号 | 公开日
    BR112012026012A2|2016-06-28|
    TW201212456A|2012-03-16|
    MX2012011949A|2012-12-17|
    CN102834999A|2012-12-19|
    CN102834999B|2015-09-09|
    WO2011130303A2|2011-10-20|
    US8653796B2|2014-02-18|
    AU2011240691B2|2014-04-03|
    JP2013527739A|2013-06-27|
    EP2545630A2|2013-01-16|
    US20130141035A1|2013-06-06|
    EP2545630B1|2016-04-06|
    US20110254511A1|2011-10-20|
    KR20120137498A|2012-12-21|
    KR101484830B1|2015-01-20|
    TWI442662B|2014-06-21|
    JP5642871B2|2014-12-17|
    US8368355B2|2013-02-05|
    WO2011130303A3|2012-05-10|
    AU2011240691A1|2012-11-01|
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    法律状态:
    2018-12-26| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-06-18| B06T| Formal requirements before examination [chapter 6.20 patent gazette]|
    2019-10-08| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2019-12-03| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 12/04/2011, OBSERVADAS AS CONDICOES LEGAIS. (CO) 20 (VINTE) ANOS CONTADOS A PARTIR DE 12/04/2011, OBSERVADAS AS CONDICOES LEGAIS |
    优先权:
    申请号 | 申请日 | 专利标题
    US12/759,963|US8368355B2|2010-04-14|2010-04-14|Portable electronic device power manager with current limit feedback control loop modification for stabilizing an external power supply|
    PCT/US2011/032157|WO2011130303A2|2010-04-14|2011-04-12|Portable electronic device power manager with current limit feedback control loop modification for stabilizing an external power supply|
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