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    • 专利摘要:
    POWER TRANSMITTER FOR TRANSMITTING POWER INDUCTIVELY TO A POWER RECEIVER THROUGH A TRANSMITTER COIL, POWER RECEIVER FOR RECEIVING POWER INDUCTIVELY FROM A POWER TRANSMITTER THROUGH A RECEIVING COIL AND A METHOD OF UNDERSTANDING WITH A METHOD OF UNDERSTANDING WITH A METHOD OF COMMUNICATION. POWER TRANSFER An inductive wireless power transfer system comprises a power transmitter to inductively transmit power to a power receiver via a transmitting coil 11 to the receiving coil 21. In the system, a communication method comprises the step 37 transmission, by the power receiver, of the first data and the second data to the power transmitter, the first data indicating a modulation request, and the second data indicating a inquiry message; step 32 for receiving, by the power transmitter, the first data and the second data from the power receiver; step 34 for transmitting a response message to respond to said inquiry message by the power transmitter by modulating a power signal in accordance with said modulation request in order to carry a response message; and step 35 for receiving the message (...).
    公开号:BR112013008708B1
    申请号:R112013008708-0
    申请日:2011-10-04
    公开日:2021-01-12
    发明作者:Andries Van Wageningen
    申请人:Koninklijke Philips N.V.；
    IPC主号:
    专利说明:

    [0001] The invention relates to a power transmitter for transmitting power inductively to a power receiver via the transmitting coil, and to a power receiver for receiving power inductively from a power transmitter via a receiving coil.
    [0002] The invention further relates to a method for communication in an inductive power transfer system, the system comprising a power receiver and a power transmitter, the power receiver comprising a receiving coil, the power transmitter comprising the transmitting coil.
    [0003] The invention relates to the field of power transfer technology using an inductive wireless power transfer system. Such systems may have one or more power transmitters that transmit power inductively through one or more transmitting coil (s) to one or more power receivers that are driven by the energy received through the receiving coil. The transmitting coil (s) and the receiving coil are in close proximity to each other. HISTORY OF THE INVENTION
    [0004] To charge batteries for battery-powered devices, such as cell phones, PDAs, remote controls, notebooks, etc. or directly power devices such as lamps or kitchen equipment, an inductive power system that allows wireless power transfer can be used. Inductive power systems for transferring power or charging mobile devices are generally known. This system comprises a device for the transmission of power, hereinafter called the power transmitter, comprising a transmitting coil that can be energized, thus generating an alternating magnetic field. The inductive power system also comprises a power receiving device, hereinafter called a power receiver, which can be connected, or be part of a device that is charged or supplied with energy. In order to receive energy, the power receiving device is equipped with a receiving coil, where the alternating magnetic field, provided by the energized transmitting coils, induces a current. This current can trigger a charge or, for example, charge a battery, trigger a display or turn on a lamp.
    [0005] US 2009/0108805 describes an inductive battery charging system designed to allow recharging of electronic devices. The system includes a planar surface of energy, where the device to be recharged is placed. On the energy surface there is at least one transmitting coil and optionally a set of transmitting coils that inductively couple the energy to a receiving coil formed in the device to be recharged. The field of application of this set can be a general energy surface for the activation of wireless devices, for example, for charging batteries, integrated into furniture or as a floor or wall covering. The document describes the communication from the power receiver to the power transmitter and vice versa. Data transfer from the secondary side (power receiver) to the primary side (power transmitter) can be done by modulating a parameter (such as loading conditions) on the secondary side. Data transfer from the primary to the secondary side can be done by modulating the excitation of a primary coil, that is, the transmitting coil. Data communication may include handshaking and compatibility checks between the primary side and the charge to be made and / or determining the battery charging condition. SUMMARY OF THE INVENTION
    [0006] The known wireless power inductive system has the disadvantage that data communication requires a specific power receiver assembly, which allows the power receiver to communicate, in particular to receive data from the power transmitter.
    [0007] It is an objective of the invention to provide a system, which allows the use of a less complex power receiver in the system.
    [0008] For this, according to a first aspect of the invention, the power transmitter as described in the opening paragraph comprises: a first unit for obtaining the first data and the second data from the power receiver, said first data indicating a modulation request, and said second data indicating a inquiry message; a second unit for transmitting a response message to the power receiver via the transmitting coil, the response message being for responding to said inquiry message; said second unit comprising: a modulator for the modulation of a power signal according to said modulation request for the transmission of the response message.
    [0009] For this purpose, according to another aspect of the invention, the power receiver as described in the opening paragraph comprises: a first unit for the transmission of the first data and the second data to the power transmitter, the first data indicating a modulation request, and the second data indicating a inquiry message; a second unit for receiving a response message from the power transmitter via the receiving coil, the response message being for responding to a inquiry message; said second unit comprising: a demodulator for the demodulation of a power signal received by the receiving coil according to the modulation request for receiving the response message.
    [0010] For this, according to another aspect of the invention, a method as described in the opening paragraph comprises the steps of: receiving, via said power transmitter, the first data and the second data from the power receiver, said first data indicating a modulation request, and said second data indicating a inquiry message; transmitting a response message to the power receiver via the transmitting coil, by demodulating a power signal according to the modulation request, the response message being to respond to a inquiry message.
    [0011] For this, according to another aspect of the invention, a method as described in the opening paragraph comprises the steps of: transmitting, via the power receiver, the first data and the second data to the power transmitter, the first data indicating a modulation request, and the second data indicating a inquiry message; receiving a response message from the transmitter via the receiving coil, by demodulating a power signal received by the receiving coil according to the modulation request, the response message being to respond to a inquiry message.
    [0012] The measurements have the effect that the first data indicate a modulation request that must be used by the power transmitter when responding to the power receiver. In addition, the second data indicates a inquiry message to which the power transmitter must respond. In the power transmitter, the second unit serves to provide a response message modulated in a power signal according to said modulation request. In addition, said response message must be to respond to said inquiry message. Advantageously, the modulation of the power signal is adjusted according to the requirements defined by the power receiver in the first data, which allows the power receiver to indicate its capabilities for the detection of said modulation. Thus, in the system, different types of power receivers can indicate different modulation requests. A power receiver can also indicate different modulation requests, for example, depending on its relative operating condition. In addition, by indicating a query message for the second data, the power receiver can request a specific response from the power transmitter.
    [0013] The invention is also based on the following recognition. In the prior art power inductive systems, several types of communications have been proposed. However, the type of modulation in a particular system will be defined during system design. The inventors found that, although a certain mode of communication may be sufficient for some power receivers and power transmitters, other requirements may arise later or in different circumstances, so that a more complex communication or a reduced type of communications can be preferred. In addition, for applications with fewer requests, the cost of the power receiver can be optimized by establishing a specific type of modulation that is easily detected through the available resources of the power receiver. Thus, the sending of data on the modulation requests and the type of response by means of the first and second data transferred from the power receiver to the power transmitter allows the establishment of the communications mode to be used by the power transmitter for the response transfer.
    [0014] In a realization of the power transmitter, said modulation request is indicative of the demodulation capacity of the power receiver. In an embodiment of the power receiver, said modulation request is indicative of the demodulation capacity of the power receiver. This has the advantage that the exchange of data on modulation requests through the first data transferred from the power receiver to the power transmitter allows communication to be established according to the capabilities of the power receiver.
    [0015] In one embodiment of the power transmitter, said second data still indicates at least one of the following: a format of said reply message, a time request for the transmission of said reply message, and the power transmitter being mounted to transmit said response message according to at least one of the formats and the time requirement. In an embodiment of the power receiver, said second data still indicates at least one of the following: a format of said reply message, a time request for the transmission of said reply message; and the power transmitter being mounted to transmit said response message according to the format and / or the time requirement.
    [0016] The format of the response message and the time request are defined using the second data. This has the advantage that various response parameters are set according to the capabilities of the power receiver.
    [0017] In a realization of the power transmitter, the modulation request corresponds to at least one of the following: a type of modulation of the power signal, a modulation range for a given type of modulation. The type of modulation of the power signal is selected from the following: amplitude modulation; frequency modulation; phase modulation; The modulation range is selected from the following: a modulation depth for the amplitude modulation of the power signal, a frequency change for the frequency modulation of the power signal, a phase change for the phase modulation of the power signal.
    [0018] In a realization of the power receiver the modulation request corresponds to at least one of the following: a type of modulation of the power signal, a modulation range for a given type of modulation. The type of modulation of the power signal is selected from the following: amplitude modulation; frequency modulation; phase modulation; The modulation range is selected from the following: a modulation depth for the amplitude modulation of the power signal, a frequency change for the frequency modulation of the power signal, a phase change for the phase modulation of the power signal This has the advantage that, in practice, at least one of the parameters of the power signal modulation can be specified. Other preferred embodiments of the devices and methods according to the invention are given in the appended claims, the disclosure of which is incorporated herein by reference. BRIEF DESCRIPTION OF THE DRAWINGS
    [0019] These and other aspects of the invention will become apparent and further elucidated with reference to the realizations described by means of examples in the following description and with reference to the accompanying drawings, in which Figure 1 shows a power transmitter, Figure 2 shows a power receiver, Figure 3 shows a flow chart for communication in an inductive power system, and Figure 4 shows a data message.
    [0020] Figures are only diagrams and are not drawn to scale. In the figures, the elements that correspond to the elements already described have the same reference numbers. DETAILED DESCRIPTION OF ACHIEVEMENTS
    [0021] To prepare and control the power transfer between a power transmitter and a power receiver in a wireless system for power transfer, the power receiver communicates information to the power transmitter.
    [0022] At the physical level, the communications channel from the power receiver to the power transmitter applies the power signal as a vehicle. The power receiver modulates a load that is detected by a change in amplitude and / or in the current phase of the primary coil, or a change in the voltage of the power transmitter. Based on this principle, the power receiver can modulate data that the power transmitter demodulates. This data is formatted in bytes and packets. More information can be found in the description "System description, Wireless Power Transfer, Volume I: Low Power, Part 1: Interface Definition, Version 1.0 July 2010, published by the Wireless Power Consortium available at http://www.wirelesspowerconsortium.com / downloads / wirelesspowe rspecificationpartl.html, also called the Qi wireless power specification, in particular in chapter 6. Communications Interface.
    [0023] To control the power transfer, the system can go through different phases, in particular a ping phase and a configuration phase, and the power transfer phase, described below. More information can be found in Chapter 5 of Part 1 of the Qi Wireless Power Specification. Initially, the power transmitter provides the power signal and enters a selection phase. The power receiver can apply the received signal to activate its electronics. In this phase, the power transmitter typically monitors the interface surface for the placement and removal of objects. The power transmitter can use several methods for this, for example, as described in the Qi wireless power specification.
    [0024] In the Ping phase, it is determined whether a power receiver is present at the power transmitter interface. After receiving the power signal, the power receiver communicates an initial packet to the power transmitter. This package is the signal resistance package that indicates the degree of coupling between the power transmitter and the power receiver. More information can be found in chapter 6.3.1 of part 1 of the Qi wireless power specification.
    [0025] In the Configuration phase, in preparation for the actual transfer of power, for example, for charging a battery, the power receiver must keep its output load off. The power receiver communicates its parameters to the power transmitter, where the power transmitter is configured. For this, the power transmitter provides a power signal of constant amplitude, frequency and phase (except for the change caused by load modulation).
    [0026] In the power transfer phase, the real power transfer occurs. After communicating your power request, the power receiver connects the output load to supply it with the received power. The power receiver monitors the output load and measures the control error between the actual value and the desired value for a given operating point. It communicates these control errors to the power transmitter at a minimum rate of, for example, every 250 ms to indicate these errors to the power transmitter, as well as the desire for a change, or no change, in the power signal. In case the actual value of the operating point is equal to the desired value, the power receiver reports a control error with a zero value, meaning that the power signal must not change. In case the power receiver reports a control error not equal to zero, the power transmitter is expected to change according to the power signal.
    [0027] Note that the wireless power specification Qi defines the communication from the power receiver to the power transmitter. Below, a system is described that allows communication in both directions, also in particular from the power transmitter to the power receiver. Various applications can benefit from this communication, for example: placing a power receiver in test mode, putting a power receiver in calibration mode or allowing communication from the power transmitter to the power receiver under the control of the power receiver , for example, to communicate a command or status information from the power transmitter to the power receiver.
    [0028] Figure 1 shows a power transmitter. The transmitting coil 11, also called the primary coil (PCL), is shown connected to a communication unit of the power transmitter 12 (TRM-COM), which is coupled to a controller 10 (CTR). The communication unit of the power transmitter 12 has a modulator 15 (MOD), coupled to a driver 16 (DRV) to drive the transmitting coil for the transmission of a modulated power signal (PS) through the transmitting coil to a coil reception. The power receiver can affect the power signal or send a signal from the power receiver to the power transmitter via secondary and primary coils, a signal that is called a reflected signal (RS). The reflected signal is detected by a sensor unit 14 (SNS), for example, which senses the current or voltage in the transmitting coil. A demodulator 13 (DEM) is coupled to controller 10 for demodulation of the detected signal, for example, converting changes in the amplitude or phase of the detected signal into bits.
    [0029] In an embodiment of the invention, a first unit 17 is assembled to receive the first data and the second data from the power receiver via the transmitting coil 11. The first unit 17 comprises the sensor unit 14, and the demodulator 13. These two units implement the function of receiving the first data and the second data through the transmitting coil. The primary coil 11 transmits an alternating magnetic field (the PS power signal) for the inductive transfer of power to the secondary coil and receives the reflected magnetic field (reflected signal RS) caused by the secondary coil. The sensor unit 14 (current / voltage sensor SNS) senses the current / voltage in the primary coil. Demodulator 13 translates changes in amplitude or phase of the perceived signal into data, for example, said first and second data. The first data obtained indicates a modulation request, and the second data indicates a inquiry message.
    [0030] The controller interprets the received data, and then a second unit 18 is mounted for transmitting a response message to the power receiver via the transmitting coil, the response message being for responding to said inquiry message. The controller provides a response message to the modulator, the response message being for responding to said inquiry message, and the controller controls the modulator according to the data interpreted as described in detail below. Modulator 15, comprised of the second unit, is arranged for the modulation of a power signal according to said modulation request, in order to carry the response message. Modulator 15 modulates the power signal by changing the amplitude, frequency or phase of the power signal. Driver 16, also comprised of the second unit, is arranged to transmit the modulated power signal through the transmitting coil to the power receiver providing an alternating electrical signal to the transmitting coil.
    [0031] Figure 2 shows a power receiver. The power receiver comprises a first unit 27 for sending the first data and the second data to the power transmitter via the receiving coil to the transmitting coil, the first data indicating a modulation request, the second data indicating a inquiry. A receiving coil 21, also called a secondary coil (SCL) is shown connected to a power receiver communication unit 22 (REC-COM), which is coupled to a controller 20 (CTR). The communication unit of the power receiver has a variable load (LD) 26 coupled to modulator 25 (MOD) for the modulation of the load on the receiving coil for the generation of said reflected signal (RS) for the transmission of the first data and the second data for the power transmitter, the first data indicating a modulation request, the second data indicating a inquiry message. From the above description, it can be understood that the first unit 27 is a function unit; it comprises modulator 25 and variable load 26. Due to the cooperation of these two units, the function of sending the first data and the second data from the power receiver to the power transmitter through the receiving coil can be implemented.
    [0032] The power receiver comprises a second unit 28 for receiving a response message from the power transmitter via the receiving coil, the response message being for responding to a inquiry message. For this, the second unit 28 comprises a sensor unit 24 (SNS) for detecting a modulated power (PS) signal received by means of the receiving coil of the power transmitter, for example, sensing a voltage or a current. The second unit also comprises a demodulator 23 (DEM), which is coupled to the controller 20, for demodulation of the detected signal according to the modulation request in obtaining the response message, for example, converting the variations in the amplitude or phase of the signal detected in bits.
    [0033] In one embodiment, the secondary coil 21 receives the power signal for the inductive power transfer from the primary coil and transmits a reflected signal to the primary coil. Load 26 determines the reflected signal. Modulator 25 varies the amplitude or phase of the reflected signal, for example, by connecting / disconnecting an impedance circuit. The current / voltage sensor unit 24 senses the current / voltage in the secondary coil as received from the transmitter. The sensor unit 24 can be part of another function of the power receiver. It can include a rectifier. You can also feel the voltage / current at the rectifier output instead of directly at the secondary coil. It can be applied to determine the resistance of the received power signal, or to determine the received power. Demodulator 23 translates the variations of the perceived signal into data. Controller 20 controls modulator 25 to communicate data and interprets data received by the demodulator as described in detail below.
    [0034] Figure 3 shows a flowchart of the communication in an inductive power system. The system can comprise a power transmitter as described above with reference to Figure 1, and a power receiver as described above with reference to Figure 2. Communication on the power transmitter (TRM) is shown on the left side of the Figure, and the communication at the power receiver (REC) is shown on the right side of the Figure.
    [0035] At the beginning 31, the power transmitter provides a power signal (PS) to the power receiver. The power receiver receives the power signal at the beginning 36, whose power signal activates the power receiver and which can be used by the power receiver to activate its electronics. The power receiver is activated to start the communication and transmits the data to the power transmitter in the Transmit Data 37 step, as indicated by the arrow RT. This data signal is provided according to the first state / mode of communications, for example, a predefined mode defined in a standard. The power transmitter receives the first data and the second data from the power receiver in step Receive Data 32. Step 32 of Receive Data comprises the receipt of a signal reflected by the transmitting coil of the power receiver, sensing the amplitude or phase of the current / voltage in the primary coil, and demodulating the sense signal, for example, converting variations in amplitude or phase into data, for example, the first data and the second data. The first data indicates a modulation request, said second data indicates a inquiry message.
    [0036] The power receiver can indicate, in the second data that it will indicate a inquiry message, a specific response from the power transmitter. In the Require Data Response 38 step, it is determined whether this response is required. If not, the power receiver continues until the end of the communication cycle. In this case, the power transmitter does not transmit data to the power receiver. If positive, that is, if the power receiver requires a data response from the power transmitter, it indicates this fact in the second data in the RT signal. In this case, this is detected in the step Require Data Response 33, and the power transmitter responds in step Transmit Data 34 transmitting the data as required by the power receiver indicated in the Figure by the arrow TR. The response is transmitted in the Transmit Data 34 step according to a second state / mode of communications; The Transmit Data 34 stage comprises the generation of a response message, designed to respond to a inquiry message, and modulate the power signal according to said modulation request, in order to transmit the response message transmitted by the signal modulated power through the transmitting coil to the power receiver.
    [0037] If the power transmitter does not respond as required, the power receiver detects a timeout in step 39 and proceeds to resend in step 37. If the power transmitter responds as required, that is, within the response to the power receiver, then the power receiver receives in Step Receive Data 35, the response message from the transmitter demodulating the power signal received by the receiving coil according to the demodulation request.
    [0038] The power receiver then proceeds to the end of the communications cycle. At the end of the communications cycle, the power receiver can begin a new communications cycle, starting at the Power Receiver Transmit Data 37 step.
    [0039] Figure 4 shows a data message. The Figure shows a package format that the power receiver communicates to the power transmitter. The format can be predefined in a pattern. The message has a preamble (PRE), a header (HDR), a message content (MES) and a sum check (CHK) for error detection.
    [0040] A similar format can be used for a package that the power transmitter communicates to the power receiver, the format of which can be indicated in the inquiry message as described in detail below.
    [0041] It is noted that the modulation request as indicated by said first data can correspond to several types of modulation. Modulation types are known to you, for example, amplitude modulation, frequency modulation, phase modulation, or any other type of power signal modulation. In addition, the modulation request can indicate a modulation range for a given type of modulation, for example, modulation depth for the amplitude modulation of the power signal, and / or a frequency change for the frequency modulation of the signal of power, and / or a phase change for the phase modulation of the power signal. The response required as transferred by said second data may indicate a format of said response message. Also, the receiver can control the communications cycle. Starts the cycle with a question. The transmitter must react to the question within a certain time, or else the receiver must assume that something has gone wrong and ends the communications cycle to try again. Thus, the length of time between the question and the answer must be limited.
    [0042] The time request indicated by the second data can be the response time request, such as, for example, a time duration of the entire cycle starting with the transmission of a inquiry message by the power receiver to receive the response message by the power receiver, or the length of time for the power transmitter to respond to a inquiry message starting at the power transmitter receiving the last bit of the inquiry message for the power transmitter to transmit the first bit of the response message, or the like.
    [0043] The time request can also be the requirement regarding the data or bit transmission speed, that is, the communication speed. It is also called "bit rate" and determines the time required to transmit a bit or the duration of the bits. Indicating the bit rate or bit duration by the power receiver helps to reduce the cost of implementing the power receiver. The longer the bit duration, the more easily the bit can be detected by the power receiver; the shorter the bit duration, the faster the response message can be communicated.
    [0044] The modulation unit and the driver on the power transmitter are arranged for the transmission of said response message according to the modulation request as indicated in the first data, and, where applicable, with said format and within said (s) (s) time request (s).
    [0045] In one embodiment, said first data and second data are included in a single data package. Alternatively, said first data and second data are included in two or more separate data packages. Multiple data packets can be transmitted to transfer a multitude of second data from the power receiver to the power transmitter.
    [0046] The following table shows some sample question packs that the power receiver can communicate to the power transmitter, indicating the required response from the power transmitter. The Header Code determines the Type of Packet and indicates the response that the power transmitter must provide; the Message indicates the modulation request for the transmission of said response.
    [0047] The first two examples (Header Code 0x07 and 0x08) require a "yes" "no" answer from the power transmitter. The message field indicates the necessary amplitude variation in case the power transmitter responds with “yes”. The value in the message field can be coded as a relative required variation with respect to the actual amplitude of the power signal (as well as the control error message field in the current Qi specification.) The third example (Header Code 0x20) indicates in which physical mode the power receiver requires the power transmitter to modulate the power signal. The default mode could be modulation With this package, the power receiver could change the mode to, for example, phase or frequency modulation. This package could be communicated in the configuration phase. The fourth and fifth examples (Heading Code 0x21 and 0x22 ) indicate that the power receiver expects the power transmitter to respond with the transmission of a packet. The message field in these examples indicates the modulation range. The value in the message field p It can be coded as a necessary relative change with respect to the amplitude / frequency / phase of the actual power signal. The shape of the package that the power transmitter uses can be shaped as shown in Figure 4.
    [0048] In one embodiment, communication as defined above is used as follows. To test a power receiver at. operating conditions, the power receiver must be placed in these various conditions. Some of these conditions are determined by external factors such as the temperature of the environment, or the positioning of the power receiver in relation to the power transmitter. These conditions can be arranged during the test procedure. Other conditions, for example, the output load of the power receiver can change from high to low impedance and the required power can change from low to high. Without bidirectional communication, these conditions can be difficult to provide in a compliance test and may also require a long measurement time. To solve this problem, the power receiver device can be adjusted to operate in a test mode where it simply passes through these operating conditions. Providing the communication as defined below, the manufacturer does not need to provide the device with other hardware, contacts, buttons, etc.
    [0049] Similar problems can occur in other applications that require communications from the power transmitter to the power receiver, for example, as a request for a power receiver to go into calibration mode. More generally, communication from the power transmitter to the power receiver is useful, for example, to provide a command to the power receiver, for example, to go to a particular mode, or to give information about the status of the power transmitter. power. A configurable communications channel from the power transmitter to the power receiver is provided to solve this problem.
    [0050] The method of communication in the inductive power transfer system is as follows. The system comprises a power receiver and a power transmitter as described above · The method comprises the step of transmitting, by the power receiver, the first data and the second data to the power transmitter, the first data indicating a modulation request, the second data indicating a inquiry message. The power transmitter generates a response message modulated in a power signal according to said modulation request, the response message being for responding to a inquiry message. Thus, the modulation that is applied by the power transmitter is established according to the modulation request as sent by the power receiver. Subsequently, the power receiver receives the power signal via the receiving coil of the transmitting coil, and demodulates the power signal according to the modulation request for receiving a response message that serves to respond to a message. of inquiry.
    [0051] In one embodiment, a single protocol is provided that allows a test power transmitter to put a power receiver into test mode. The power receiver asks the power transmitter, via a query message in a dedicated package, if it wants the power receiver to go into test mode. The package includes the desired (changing) power signal that the power receiver can detect. In response to this package, the power transmitter provides a power signal according to whether or not the power receiver wishes, indicating that the power receiver goes into the test mode.
    [0052] Generally, the invention allows communication from the power transmitter to the power receiver, where the power receiver controls how the power transmitter must respond. Due to the fact that the required response is under the control of the power receiver, there is freedom from implementation in the power receiver and, in addition, with low hardware installation cost. The power receiver, for example, determines the necessary depth of amplitude modulation. The designer can determine what depth of modulation is needed in the circumstances to easily demodulate. The power receiver can reuse its existing hardware, for example, for this it can reuse the hardware for measuring signal strength.
    [0053] In one embodiment, before the power transfer, the power receiver communicates configuration packages to the power transmitter, which must prepare the power transmitter for the power transfer. In this phase, the power receiver does not normally have control of the power transmitter with respect to the power signal. The power transmitter keeps the signal constant. Subsequently, during power transfer, the power receiver communicates the control package to the power transmitter to control the power transmitter in adapting the power signal according to the power receiver's desire. If the power receiver communicates a control package during the configuration phase, indicating a desired change in the power signal that is detectable by the power receiver, it has a special meaning, because during the configuration phase the power signal is kept constant , for example, the special meaning could be to detect whether the power transmitter wants the power receiver to go into test mode.
    [0054] The power transmitter changes or does not change the power signal in the configuration phase to indicate whether or not the power receiver should go into test mode. This can be seen as a 1-bit communication from the power transmitter to the power receiver. This change can, in principle, be a change in amplitude, frequency or phase. The change can be made once, or several times. The change can be synchronized with the communication of the configuration packages, for example, directly after receiving a certain package.
    [0055] To minimize the demands on the power receiver to be able to detect this signal change, the necessary signal change for the communication of this bit is under the control of the power receiver. The contents of the control error package determine the necessary signal change. The power receiver designer can choose which signal the power receiver should measure to detect the change in signal.
    [0056] Both the power transmitter and the power receiver can apply exactly the same mechanism for controlling the power signal in the power transfer phase. The power receiver applies the signal it measures and is relevant in some way to the control. It does not require any additional hardware for the power receiver and hardly any software. The only change for the power receiver is to communicate a control pack to which the power transmitter can respond by changing the power signal and then checking the expected change in the power signal.
    [0057] In one embodiment, if the power transmitter wants the power receiver to go into test mode, the power transmitter does not change the power signal; otherwise, it changes the signal according to the control package. The power receiver goes into test mode if the signal does not change according to the control package.
    [0058] In an alternative embodiment, if the power transmitter wants the power receiver to go into test mode, the power transmitter changes the power signal according to the control signal; otherwise, the power signal does not change. The power receiver goes into test mode if the signal changes according to the control package. Advantageously, if the control packet does not arrive, the power transmitter does not change the power signal. This means that the power receiver does not go into the test mode by default.
    [0059] In another alternative embodiment, if the power transmitter wants the power receiver to go into test mode, the power transmitter changes the power signal according to the control signal and then returns to the original signal; or else the power signal does not change. The power receiver goes into test mode if the signal changes according to the control package. Advantageously, the power signal is only slightly changed to another value.
    [0060] In one embodiment, the power receiver communicates a packet dedicated to the power transmitter, to which the power transmitter must respond. The package includes the said inquiry message, which indicates how the power transmitter should respond. The power receiver can apply this package in any phase (for example) the power transfer configuration or phase according to the wireless power specification Qi). If the power transmitter does not respond, the power receiver views this as an error and can resend the dedicated packet for another attempt.
    [0061] At the logical level, the dedicated package can indicate what type of content is expected from the power transmitter. The power receiver can request a yes / no answer to a question, for example, whether the power receiver should go into test mode. Alternatively, the power receiver can request a command, for example, it can request a command that indicates which mode the power receiver should go to. The power receiver can also request status information from the power transmitter, for example, how much power the power transmitter can provide.
    [0062] At the coding level, the dedicated package indicates which coding is expected from the power transmitter. This can be a single bit if a yes / no response is expected, or a complete package if an instruction or status indication is expected. An existing encoding technique for bit, byte and packet encoding can be applied. For example, a biphasic encoding for bits can be applied; bytes can be encoded as 8-bit data, start bits, stop bits and parity bits; packages can be encoded by a preamble, content and error checking, as shown in Figure 4. Further information on possible encoding techniques can be found in chapters 6.2 .2, 6.2.3 and 6.2.4 of part 1 of the specification wireless power Qi, which describes a predetermined encoding technique used for transmitting data from the power receiver to the power transmitter.
    [0063] At the physical level, the dedicated package can indicate what type of modulation is expected. The power receiver indicates the required amplitude, frequency, or phase modulation that the power transmitter must perform on its power signal. For example, the required amplitude modulation is indicated similarly to the control error package. The power transmitter must change its power signal between two levels. The change between the two levels is indicated by the content of the dedicated package. The first level can be equal to the actual power level, which is the power level just before the power receiver communicates its dedicated package. Thus, the first change called for a change in the power level from the current level to the new level, as with a control error package in the power transfer phase. The power transmitter shifts the signal back and forth between the actual level and the new level for bit communication. Both levels may differ from the actual power level. For example, the first level may be higher and the second level may be lower than the actual power level. The average of the two levels can be equal to the actual power level.
    [0064] Note that the invention can be carried out in hardware and / or software, using programmable components. It will be seen that, for clarity, the above description refers to embodiments of the invention with reference to different components, functional units and processors. However, it will be apparent that any suitable distribution of functionality between different functional units or processors can be used without deviating from the invention. For example, the functionality illustrated as being performed by separate units, processors or controllers can be performed by the same processor or controller. Thus, references to specific functional units should only be seen as references to adequate means to provide the described functionality, rather than being indicative of a rigid logical or physical structure or organization.
    [0065] Although the present invention has been described in connection with some embodiments, it is not intended to be limited to the specific form set forth herein. Furthermore, although a characteristic may appear to be described in connection with particular embodiments, the skilled person recognizes that various characteristics of the described embodiments can be combined according to the invention. In the claims, the term comprising does not exclude the presence of other elements or stages.
    [0066] Furthermore, although listed individually, a plurality of medium, elements, units or method steps can be performed, for example, by a single unit or processor. Furthermore, although individual features can be included in different claims, they can possibly and advantageously be combined, and inclusion in different claims does not imply that a combination of different features is not possible and / or advantageous. Also, the inclusion of a feature in a category of claims does not imply a limitation to this category, but it does indicate that the feature applies equally to other categories of claims as appropriate. In addition, the order of the categories in the claims does not imply any specific order in which the characteristics are to be worked on and, in particular, the order of the individual steps in a method claim does not imply that the steps must be carried out in that order. Instead, the steps can be performed in any suitable order. In addition, singular references do not exclude a plurality. Thus, references to "one", "one", "first", "second" etc. they do not exclude a plurality. The reference signs in the claims are provided as an example of clarification only and should not be construed as limiting the scope of the claims in any way.
    权利要求:
    Claims (16)
    [0001]
    POWER TRANSMITTER TO TRANSMIT POWER INDUCTIVELY TO A POWER RECEIVER THROUGH A TRANSMITTER COIL (11), the power transmitter being characterized by comprising: a sensing and demodulating unit (17) configured to receive the first data and the second data from the power receiver via the transmitting coil (11), said first data indicating a modulation request, and said second data indicating a message of modulation inquiry indicating whether the response is required from the power transmitter, in which the second data further indicates a response message format or time request to transmit a response message; and a modulation and transmission unit (18) configured to transmit the response message to the power receiver via the transmitting coil (11) when the response message is required according to the second data, said modulation and transmission unit they generate a power signal in accordance with said modulation request when the response message is transmitted, in which the response message is modulated in the power signal.
    [0002]
    POWER TRANSMITTER, according to claim 1, characterized in that said modulation request is indicative of the demodulation capacity of the power receiver.
    [0003]
    POWER TRANSMITTER, according to claim 1, characterized in that the power transmitter is configured to transmit said response message according to at least one of the formats and the time requirement.
    [0004]
    POWER TRANSMITTER, according to claim 1, characterized by the modulation request corresponding to at least one of the following: a type of modulation of the power signal, a modulation range for a given type of modulation.
    [0005]
    POWER TRANSMITTER, according to claim 4, characterized in that the type of power signal modulation is selected from the following: amplitude modulation; frequency modulation; and phase modulation, where the modulation range is at least one of a modulation depth for the power signal amplitude modulation, a frequency change for the power signal frequency modulation and a phase change for the modulation phase of the power signal.
    [0006]
    POWER TRANSMITTER, according to claim 1, characterized in that said first data and the second data are in a single data packet or in two separate data packets.
    [0007]
    POWER RECEIVER FOR RECEIVING POWER INDUCTIVELY FROM A POWER TRANSMITTER THROUGH A RECEPTION COIL, the power receiver being characterized by comprising: a modulation and transmission unit (27) configured to transmit the first and second data to the power transmitter via the transmitting coil (11), said first data indicating a modulation request, and said second data including a message inquiry indicating whether the response is required from the power transmitter, in which the second data further indicates a response message format or time request to transmit a response message; and a sensor and demodulating unit (28) configured to receive the response message from the power transmitter via the transmitting coil (11) when the response message is requested according to the second data, said sensor and demodulating unit is further configured to demodulate a power signal received by the receiving coil according to the modulation request when receiving the response message, the response message being modulated in the power signal by the signal transmitter.
    [0008]
    POWER RECEIVER, according to claim 7, characterized in that said modulation request is indicative of the demodulation capacity of the power receiver.
    [0009]
    POWER RECEIVER, according to claim 7, characterized in that the power receiver is configured to transmit said response message according to at least one of the formats and the time request.
    [0010]
    POWER RECEIVER, according to claim 7, characterized by the modulation request corresponding to at least one of the following: a type of modulation of the power signal, a modulation range for a given type of modulation.
    [0011]
    POWER RECEIVER, according to claim 7, characterized in that the type of modulation of the power signal is selected from the following: amplitude modulation; frequency modulation; and phase modulation, wherein the modulation range is at least one of a modulation depth for the power signal amplitude modulation, a frequency change for the power signal frequency modulation, and a phase change for the phase modulation of the power signal. power signal.
    [0012]
    POWER RECEIVER, according to claim 7, characterized in that said first data and second data are sent by means of a single data packet or by means of two separate data packets.
    [0013]
    METHOD FOR COMMUNICATION IN AN INDUCTIVE POWER TRANSFER SYSTEM, the system comprising a power receiver and a power transmitter, the power receiver comprising a receiving coil, the power transmitter comprising a transmitting coil, the method comprising : receiving (32) the first data and second data from the power receiver, said first data indicating a modulation request, and said second data indicating a inquiry message indicating whether a response message is required by the power transmitter, wherein the second data further indicates a response message format or a time request to transmit the response message; and transmit (34) the response message, when the response message is required according to the second data, to the power receiver via the transmitting coil by generating a power signal according to the modulation request, in which the response message is modulated in the power signal.
    [0014]
    METHOD, according to claim 13, characterized by the modulation request corresponding to any of the following: a type of modulation of the power signal, a modulation depth for the amplitude modulation of the power signal, a frequency change for the frequency modulation of the power signal, a phase change for the phase modulation of the power signal.
    [0015]
    METHOD FOR COMMUNICATION IN AN INDUCTIVE POWER TRANSFER SYSTEM, the system characterized by comprising a power receiver and a power transmitter, the power receiver comprising a receiving coil, the power transmitter comprising the transmitting coil, the method comprises: transmit (37) the first data and the second data to the power transmitter via the receiving coil, the first data indicating a modulation request, and the second data including a inquiry message indicating whether a response message is required from the power transmitter, in which the second data also indicates the format of the response message or a time request for transmission of the response message; and receiving (35) a response message, when the response message is required according to the second data, from the transmitter via the receiving coil by demodulating a power signal received by the receiving coil according to the request modulation, where the response message is modulated in the power signal.
    [0016]
    METHOD, according to claim 15, characterized by the modulation request corresponding to any of the following: a type of modulation of the power signal, a modulation depth for the amplitude modulation of the power signal, a frequency change for the frequency modulation of the power signal, a phase change for the phase modulation of the power signal.
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    法律状态:
    2018-02-06| B25D| Requested change of name of applicant approved|Owner name: KONINKLIJKE PHILIPS N.V. (NL) |
    2018-02-20| B25G| Requested change of headquarter approved|Owner name: KONINKLIJKE PHILIPS N.V. (NL) |
    2018-12-26| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-07-30| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-03-31| B07A| Application suspended after technical examination (opinion) [chapter 7.1 patent gazette]|
    2020-11-10| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-01-12| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 04/10/2011, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
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    PCT/IB2011/054342|WO2012049582A1|2010-10-13|2011-10-04|Power transmitter and power receiver for an inductive power system|
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