Electronic assembly, wireless power communication device, wireless power transmission system and related control method

Abstract

An electronic assembly for use in a wireless power transmitter or a wireless power receiver includes a control circuit to adjust at least one of a coupling coefficient K between the wireless power transmitter and the wireless power receiver and a load quality factor Q of the wireless power receiver such that a product of K and Q is less than a constant. Embodiments of the present invention can cause a transfer function between the wireless power transmitter and the wireless power receiver to remain monotonic over a frequency range of a drive signal of the wireless power transmitter.

Description

[Technical Field]

[0001] This invention relates to the field of wireless power transmission technology, and in particular to an electronic component, a wireless power communication device, a wireless power transmission system, and related control methods. [Background Technology]

[0002] Wireless Power Transfer Systems (WPTS) have become increasingly popular due to their ease of power transmission without the use of cables or connectors. Currently, WPTS used in industry can be broadly categorized into two main types: Magnetic Induction (MI) systems and Magnetic Resonance (MR) systems. Both types of systems include a wireless power transmitter and a wireless power receiver. These systems can be used to power or charge mobile devices (e.g., smartphones, tablets) in other applications.

[0003] Inductive WPTS systems typically operate within a specified frequency range of several hundred hertz, using frequency variation as the power control mechanism. Magnetic resonant WPTS systems typically operate at a single resonant frequency, using input voltage regulation to adjust the output power. In a typical application, a magnetic resonant WPTS system operates at a frequency of 6.78 MHz.

[0004] Many industry committees have been working to advance international standards for consumer products based on wireless power transmission. [Summary of the Invention]

[0005] This invention discloses an electronic component, a wireless power communication device, a wireless power transmission system, and a related control method, which enables the transfer function between the wireless power transmitter and the wireless power receiver to remain monotonic within the frequency range of the drive signal of the wireless power transmitter.

[0006] This invention provides an electronic component for use in a wireless power transmitter or wireless power receiver, the electronic component comprising:

[0007] A control circuit is used to adjust at least one of the coupling coefficient K between the wireless power transmitter and the wireless power receiver and the load quality factor Q of the wireless power receiver, such that the product of K and Q is less than a constant.

[0008] The present invention provides a wireless power communication device, which is a wireless power transmitter or a wireless power receiver, and may include the electronic components described in the present invention.

[0009] The present invention provides a method for controlling a wireless power transmitter or a wireless power receiver, which may include:

[0010] Adjust at least one of the coupling coefficient K between the wireless power transmitter and the wireless power receiver and the load quality factor Q of the wireless power receiver so that the product of K and Q is less than a constant.

[0011] As can be seen from the above, in this invention, at least one of the coupling coefficient K between the wireless power transmitter and the wireless power receiver and the load quality factor Q of the wireless power receiver is adjusted so that the product of K and Q is less than a constant, thereby making the transfer function between the wireless power transmitter and the wireless power receiver monotonic in the frequency range of the drive signal of the wireless power transmitter. [Attached Image Description]

[0012] Figure 1 A block diagram of a wireless power system 100 is shown.

[0013] Figure 2 The graph shows the magnitude response coordinates of the three transfer functions for three different scenarios where the transmitter coil and receiver coil are at three different distances.

[0014] Figure 3 This shows that when the distance between the transmitter and receiver coils remains constant, but the load condition is reduced due to increasing Ro from 3.3 ohms to 9.9 ohms, the effect is... Figure 2 The impact of the transfer function in the process.

[0015] Figure 4 A flowchart of method 40 for maintaining the monotonic behavior of the transfer function.

[0016] Figure 5 An embodiment of a wireless power receiver 11 for a wireless power transmission system is shown.

[0017] Figure 6 A flowchart illustrating a method for controlling the receiver's resistance to maintain the monotonic behavior of the transfer function.

[0018] Figure 7 A flowchart illustrating a method for controlling the inductance or capacitance of a receiver to maintain the monotonic behavior of its transfer function.

[0019] Figure 8 A flowchart illustrating a method for controlling the coupling coefficient of the receiver to maintain the monotonic behavior of the transfer function.

[0020] Figure 9A flowchart illustrating a method for controlling the target voltage of the receiver to maintain the monotonic behavior of the transfer function.

[0021] Figure 10 A flowchart illustrating a method for controlling the receiver's operating frequency to maintain the monotonic behavior of the transfer function.

Detailed Implementation Methods

[0022] In a WPTS (Wireless Power Transmitter and Receiver System), the wireless power transmitter and receiver can be inductively coupled to each other. Due to factors such as distance, coil geometry, or coil position between the wireless power transmitter and receiver, they can be loosely coupled, meaning their coupling coefficient may be relatively low. When at least one of the distance, position, or load seen by the wireless power receiver changes, the load impedance seen by the wireless power transmitter will vary over a wide range, at least partially due to the change in coupling. For example, the load impedance seen by the wireless transmitter may change when multiple receivers are positioned close to the transmitter, or when the loss level of the battery being charged by the transmitter changes, or when the charging rate of the battery changes.

[0023] The transfer function of a WPTS describes the power transmitted over a frequency range. The magnitude of the transfer function peaks at the system's resonant frequency. Sometimes, it is desirable to operate the system at frequencies higher than the resonant frequency. In practical systems, this operation is beneficial for soft switching in semiconductor devices, reducing power losses during soft switching in the WPTS. In some embodiments, assuming the transfer function is monotonic at frequencies higher than the resonant frequency, the closer the drive signal frequency (the frequency used to drive inverter 3) is to the system resonant frequency F0, the greater the power transmitted. The farther away from the resonant frequency F0, the less power is transmitted. In practical WPTSs, the drive frequency varies between a high operating frequency F2 and a low operating frequency F1. This allows the WPTS to effectively control the quality of transmitted power by adjusting the frequency used for power transmission. However, the inventors have found that in some combinations of loads and / or couplings, the transfer function can become non-monotonic above the resonant frequency, exhibiting a split resonant peak; the resonant frequency will become effectively higher than F0. Because frequency control methods may not effectively control the transmitted power when the frequency exceeds the maximum value of the transfer function, operation at frequencies higher than the maximum value of the transfer function is undesirable. When the transfer function is non-monotonic above the resonant frequency, the drive signal frequency range of the WPTS will decrease to between the maximum value of the transfer function and the high operating frequency F2. Furthermore, since the non-monotonic behavior is lower than the local maximum value of the transfer function, the level of power that can be transmitted may also shrink. Either of these effects will prevent the system from achieving the desired power level within a specific drive signal frequency range. The technique described in this invention allows wireless power transmission systems to operate within a specified frequency range and achieve the desired power transmission level. The inventors have grasped the system parameters that ensure the transfer function is monotonically transmitted across the drive signal frequency range and have developed techniques for adjusting one or more system parameters to maintain the monotonic behavior of the transfer function. According to some embodiments, such techniques require adjusting one or more system parameters to maintain the relationship between the coupling coefficient between the transmitter coil and the receiver coil and the load quality factor of the receiver coil.

[0024] Figure 1A block diagram of a wireless power system 100 is shown, comprising a wireless power transmitter 1 and a wireless power receiver 11. The wireless power transmitter 1 includes a drive circuit 7, which includes an inverter 3 for driving a transmitter coil 10 via a matching network 6. The wireless power transmitter 1 may include a voltage regulator 2 (e.g., a voltage stabilizer) for providing a stable DC voltage to the inverter 3. The voltage regulator 2 generates a stable DC output voltage according to a control stimulus output from a controller 5. In some embodiments, the drive circuit 7 may be a soft-switched power converter, for example, a Class E amplifier for converting the DC voltage to an AC output voltage at the input of the inverter 3 to drive the transmitter coil 10. Providing an AC output voltage enables wireless power transmission via electromagnetic induction. The controller 5 can control a signal generator 9 to drive the inverter 3 using a signal with a selected wireless power transmission frequency. For example, inverter 3 can perform switching in the frequency range of 100kHz-205kHz to transfer power to a wireless power receiver that wishes to receive wireless power according to the quality factor specifications of the corresponding low power quality factor receiver, and inverter 3 can perform switching in the frequency range of 80kHz-300kHz to transfer power to a medium power quality factor receiver. Inverter 3 switches at higher frequencies, for example, frequencies located in the ISM band and greater than 1MHz, such as 6.765MHz-6.795MHz, to transfer power to a receiver that wishes to receive wireless power using magnetic resonance technology. However, these frequencies are only examples, as wireless power can be transmitted at a variety of suitable frequencies following any suitable specifications. Controller 5 can be analog circuitry, digital circuitry, or a combination thereof. Controller 5 can be programmable and can control signal generator 9 to generate signals at the desired transmission frequency according to stored program instructions so that inverter 3 switches at the desired transmission frequency. Matching network 6 can facilitate wireless power transmission by presenting a suitable impedance to inverter 3. The matching network may include one or more capacitors or inductors, or any combination of any capacitors or inductors. Since the transmitter coil 10 may include inductive impedance, in some embodiments, the matching network 6 may include one or more capacitor components that, when combined with the transmitter coil 10, present an impedance suitable for driving the transmitter coil 10 at the output of the inverter 3. In some embodiments, during wireless power transmission, the resonant frequency of the matching network 6 may be equal to or approximately equal to the switching frequency of the inverter 3. The transmitter coil 10 may be implemented using any suitable type of conductor. The conductor may be a wire (including solid wire or stranded wire) or a patterned conductor (e.g., a patterned conductor of a printed circuit board or integrated circuit).

[0025] An alternating current at transmitter coil 10 generates an oscillating magnetic field according to Ampere's law. This oscillating magnetic field induces an alternating voltage at receiver coil 12 of wireless power receiver 11 according to Faraday's law. The induced alternating voltage at receiver coil 12 is supplied by matching network 13 to rectifier 14 to generate an unstable DC voltage. Rectifier 14 may be a synchronous rectifier or may be implemented using diodes. The unstable DC voltage is adjusted by DC-DC converter 15, the output of which is further filtered and supplied to the load as output voltage Vout. In some embodiments, DC-DC converter 15 may be a linear regulator, buck regulator, boost regulator, flyback regulator, or any other suitable converter. Control unit 16 may be analog circuitry, digital circuitry, or a combination thereof, and the control unit may be programmable. In some embodiments, control circuitry 16 may be included in rectifier 14 or DC-DC converter 15, or may be separated into multiple components. In some embodiments, control unit 16 may be located between rectifier 14 and DC-DC converter 15.

[0026] As mentioned earlier, the operation of the wireless power system 100 may be limited by the characteristics of the system's transfer function. Figure 2 The graph shows the magnitude response coordinates of the three transfer functions for three different distances between the transmitter and receiver coils. In the coordinate system, the x-axis represents the frequency (in kilohertz), and the y-axis represents the magnitude of the transfer function. The curves of these transfer functions are shown with coils 10 and 12 using the same type of coil and a load of 3.3 ohms at the wireless power receiver. Curve 20 shows the transfer function when the coil distance is 6 mm. Curve 22 shows the transfer function when the coil distance is 3 mm. Curve 24 shows the transfer function when the coil distance is 0 mm.

[0027] As shown in the figure, within the driving signal frequency range, curve 20 is monotonic, while curves 22 and 24 are non-monotonic. Figure 2As shown, when the transmitter and receiver coils are brought close together, the coupling between them increases, and the system's transfer function may become non-monotonic. For the desired drive signal frequency range of 110kHz-180kHz, curve 20 is a suitable transfer function because it exhibits monotonic behavior across the entire frequency range. However, curves 22 and 24 are non-monotonic in the 110kHz-180kHz range, having resonant frequencies of approximately 120kHz and 145kHz, respectively. Therefore, adjusting the system's driver frequency using typical frequency control techniques may not produce the desired adjustment in resonance-based power transfer for curves 22 and 24. When operation is restricted to the right side of the resonance in both cases, the range of output power will be limited. Since the output power range and drive signal frequency range narrow as coupling between coils increases, limiting the power range will limit the maximum power that can be transferred and restrict control over the transferable power. The smaller ranges of curves 22 and 24 compared to curve 20 result in limitations on power transfer control and reduce the maximum power transfer value. It should be noted that although this embodiment shows that the distance between the coils causes the transfer function to exhibit non-monotonic behavior in the driving signal frequency range, as described later, other factors can also cause the transfer function to exhibit non-monotonic behavior.

[0028] Figure 3 This shows that when the distance between the transmitter and receiver coils remains constant, but the load condition is reduced due to increasing Ro from 3.3 ohms to 9.9 ohms, the effect is... Figure 2 The influence of the transfer function in the process. For example... Figure 3 As shown, reducing the load by increasing Ro makes all transfer functions monotonic. Adjusting Ro is equivalent to adjusting the quality factor Q by adjusting the load of the wireless power receiver. Figure 3 Several transfer functions are shown, all of which exhibit monotonic behavior. Figure 2Similarly, in the coordinate system, the x-axis represents frequency (unit: kilohertz), and the y-axis represents the magnitude of the transfer function. When plotting the curves representing these transfer functions, coils 10 and 12 are standard coil types, and the load at the wireless power receiver is 9.9 ohms. Curve 30 shows the transfer function when the coil distance is 6 millimeters, and curve 30 is a monotonic transfer function of the system. Curve 32 shows the transfer function when the coil distance is 3 millimeters. Curve 34 shows the transfer function when the coil distance is 0 millimeters. All three curves exhibit monotonic behavior over the entire driving signal frequency range of 110kHz-180kHz. The driving signal frequency range enumerated herein should not be construed as a limitation of the present invention, but is merely an example for describing the monotonic behavior of the transfer function of a WPTS. As described below, increasing Ro decreases the load quality factor Q. Reducing the load quality factor Q can change the transfer function from non-monotonic to monotonic within the driving signal frequency range.

[0029] The inventor has recognized that specific system conditions are selected or controlled to make the transfer function monotonic within the driving signal frequency range. In particular, the inventor has recognized that as long as the product between the coupling coefficient K of the primary and secondary coils and the quality factor Q of the load secondary coil does not exceed a constant, the transfer function will be monotonic within the driving signal frequency range. In the equation: K*Q<C, C is a constant. In some embodiments, C may be 1, or 0.8, or a value between 0.8 and 1, or another suitable value. As long as the equation is satisfied, the transfer function of the WPTS will be monotonic across resonance. Designing or controlling a wireless power transfer system such that the above equation is satisfied allows the transfer function to be monotonic under any desired load, coupling and coil distance conditions. The condition can be satisfied by designing K or Q, or K and Q can be controlled to maintain the above relationship. One or more of K and Q can be adjusted to maintain the above relationship.

[0030] Control of K and / or Q can be achieved in a variety of ways. K is determined by physical dimensions and relationships, while Q is preferably determined by electronic relationships. Q can be expressed as:

[0031]

[0032] wherein Ls is the inductance of the receiver 11, Cs is the capacitance of the receiver 11, Ro is the apparent resistance of the receiver 11, and r is the parasitic resistance of the receiver 11. Any one of these variables can be used to control Q to establish or maintain the monotonic behavior of the transfer function of the WPTS.

[0033] The method for maintaining the above relationship by controlling K or Q will be discussed next. Figure 4A flowchart of a method 40 for maintaining the monotonic behavior of a transfer function. Method 40 may include action 42, which includes measuring characteristics of receiver 11. Figure 5 As shown, the characteristic may be at least one of current, voltage, or other suitable characteristics of the signal at receiver 11. Action 44 may include adjusting at least one of the quality factors defining the quality factor Q and the coupling coefficient K so that the product of Q and K is less than a constant C. This method may occur multiple times during the wireless power transmission process to ensure that the transfer function remains monotonic during the wireless power transmission, or the method may occur only once during the wireless power transmission process. In some embodiments, it may be executed by control unit 16 and / or controller 5. Figure 4 The method shown (that is, in the embodiments of the present invention, the control unit 16 or the controller 5 may be a control circuit of an electronic component for adjusting the coupling coefficient K or the quality factor Q).

[0034] The following section describes the use of the above techniques in wireless power receiver circuitry. Figure 5 An embodiment of a wireless power receiver 11 for a wireless power transmission system is shown. As previously described, the wireless power receiver 11 may include a receiver coil 12, a matching network 13, a rectifier 14, a DC-DC converter 15, and a control unit 16 capable of in-bandwidth or out-of-bandwidth communication with a wireless power transmitter. The receiver 11 may further include a current measuring device 52, a voltage measuring device 56, a resistive impedance 54, and a load 58. In some embodiments, the current measuring device 52 and / or the voltage measuring device 56 may be part of the control unit 16. In some embodiments, the resistive impedance 54 may be a representation of the equivalent impedance of the DC-DC converter 15 and the load 58, rather than a true circuit component, and thus represents Ro in the aforementioned equation. In some embodiments, only one current measuring device 52 and one voltage measuring device 56 are required, or any other measuring device suitable for measuring the characteristics of the signal of the receiver 11 may be used. In some embodiments, the control unit 16 uses the measurement results of measuring devices 52 and / or 56 to dynamically adjust the equivalent load 54 of the rectifier 14 using the techniques described above, thereby altering the operating condition of the DC-DC converter 15 to maintain the monotonicity of the transfer function of the wireless power system. For example, when the DC-DC converter 15 is a buck converter, if the equivalent impedance 54, as estimated by the measurement results of measuring devices 52 and 56, is too low to satisfy the standard Q*Ro>constant, the control unit 16, communicating within or outside the bandwidth, can request an increase in the rectifier output voltage and can also control a decrease in the duty cycle factor of the converter 15, thereby keeping the receiver output unchanged.

[0035] In one embodiment, it can be achieved by using Figure 6Method 60 shown adjusts Ro to control Q. This embodiment can be used alone or in combination with other control mechanisms described in this invention. In this embodiment, resistor 54 can be an adjustable impedance unit, such as a variable resistor or a set of switched resistors, or the equivalent resistance of other parts of receiver 11 as described above. In action 62, characteristics of the receiver, such as the voltage or current of the signal, can be measured. In action 63, it is verified that the product of K and Q is less than a constant C. In action 64, control unit 16 can control the value of resistor 54 so that the product of the quality factor and the coupling coefficient is less than a constant C. When resistor 54 is an adjustable impedance unit, the value of resistor 54 can be controlled directly, or the equivalent resistance 54 can be changed by controlling the current or voltage flowing from rectifier 14 (hereinafter referred to as...). Figure 9 The example will illustrate how to control the voltage output from rectifier 14 to change the equivalent resistance 54. Because the DC-DC converter 15 keeps the output voltage approximately constant, this mitigates voltage and / or current variations caused by adjusting the value of the resistor or Ro.

[0036] In one embodiment, it can be used Figure 7 The method 70 shown adjusts C and / or L to control Q. This embodiment's method can be combined with any other control mechanism described. C and / or L can be controlled in various ways. C can be adjusted by controlling a frequency-dependent capacitor, a voltage-dependent capacitor, a switched capacitor bank, or any other component whose capacitance can be adjusted. Similarly, L can be adjusted by controlling any variable capacitor assembly, a switched inductor assembly, or an adjustable tap of the receiver coil 12. In action 72, the receiver characteristics, such as the voltage or current of the signal, are measured. In action 73, it is verified that the product of K and Q is less than a constant C. In action 74, the control unit 16 can control the value of L or C so that the product of the quality factor and the coupling coefficient is less than a constant C.

[0037] In one embodiment, it can be used Figure 8 The method 80 shown controls K. This embodiment's method can be combined with any other control mechanism described. In action 82, a characteristic of the receiver is measured, such as the voltage or current of the signal. In action 83, it is verified that the product of K and Q is less than a constant C. In action 84, the control unit 16 can control the value of K so that the product of K and Q is less than a constant C. Various methods can be used to control K, for example, by a mechanical system relating to the coupling distance between the transmitter coil 10 and the receiver coil 12. This mechanical system, under the control of the control unit 16, can use a standoff distance to generate a specific minimum distance to keep K less than its maximum value.

[0038] In one embodiment, it can be used Figure 9 The method 90 shown controls the target voltage of the wireless power receiver. This embodiment's method can be combined with any other control mechanism described. In action 92, a characteristic of the receiver, such as the voltage or current of a signal, is measured. In action 93, it is verified that the product of K and Q is less than a constant C. In action 94, the control unit 16 can control the target voltage of the wireless power receiver to change the equivalent impedance 54 so that the product of K and Q is less than a constant C. For example, if the wireless power transmission system operates in a closed-loop control environment, the rectifier output voltage can be the voltage controlled by the closed loop. When the control loop controls the rectifier output voltage so that the output voltage equals the target voltage, the rectifier output voltage can nominally be referred to as the "target voltage".

[0039] In one embodiment, it can be used Figure 10 The method 1000 shown controls the operating frequency of a wireless power transmitter (i.e., the frequency at which the transmitter coil transmits signals). This embodiment's method can be combined with any other control mechanism described. In action 102, characteristics of the receiver are measured, such as the voltage or current of the signal. In action 103, it is verified that the product of K and Q is less than a constant C. In action 140, the controller 5, like the control unit 16, controls the operating frequency of the wireless power transmitter using in-bandwidth or out-of-bandwidth communication links, thereby adjusting the quality factor Q so that the product of K and Q is less than a constant C.

[0040] As previously described, controller 5 can be used to control the wireless power transmitter and control unit 16 can be used to control the wireless power receiver. Controller 5 and control unit 16 can be implemented using any suitable type of circuitry. For example, controller 5 and control unit 16 can be implemented in hardware or a combination of hardware and software. When implemented in software, suitable software code can be executed on any suitable processor or set of processors. The one or more controllers can be implemented in various ways, for example, using dedicated or general-purpose hardware (e.g., one or more processors) programmed by microcode or software to perform the functions described above.

[0041] The various parts of the apparatus and techniques described in this invention can be used independently, in combination, or in other ways not previously described. Therefore, this invention is not limited to the application or arrangement of the components described above or shown in the drawings. For example, a component described in one embodiment can also be combined in any way with components described in other embodiments.

[0042] The use of ordinal numbers such as "first," "second," and "third" to modify elements in the claims does not imply any priority, order of precedence, sequence of elements, or chronological order of the methods performed, but is merely used as an identifier to distinguish different elements with the same name (but different ordinal numbers).

[0043] Certain terms are used in the specification and claims to refer to specific components. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The terms "comprising" and "including" used throughout the specification and claims are open-ended and should be interpreted as "comprising but not limited to." "Substantially" means that, within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error. Furthermore, the term "coupled" here includes any direct and indirect electrical connection means. Therefore, if a first device is described as coupled to a second device, it means that the first device can be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connection means. The following description is a preferred mode for carrying out the invention and is intended to illustrate the spirit of the invention rather than to limit the scope of protection of the invention. The scope of protection of the invention shall be determined by the appended claims.

[0044] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the scope of the invention. Any person skilled in the art can make some modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. An electronic assembly for use in a wireless power transmitter or a wireless power receiver, characterized by, include: A control circuit is used to dynamically adjust at least one of the coupling coefficient K between the wireless power transmitter and the wireless power receiver and the load quality factor Q of the wireless power receiver during wireless power transmission, such that the product of K and Q is less than a constant, said constant being less than or equal to 1.

2. The electronic assembly of claim 1, wherein, The control circuit is further used to measure the electronic characteristics of the wireless power receiver and adjust the Q value based on the electronic characteristics.

3. The electronic assembly of claim 2, wherein, The control circuit includes at least one of a current measuring device and a voltage measuring device.

4. The electronic assembly of claim 1, wherein, The control circuit is used to adjust at least one of the capacitor, inductor, resistor, and load of the wireless power receiver to adjust Q.

5. The electronic assembly of claim 4, wherein, The control circuit adjusts the capacitor by controlling the variable capacitor of the wireless power receiver.

6. The electronic assembly of claim 4, wherein, The control circuit is used to adjust the inductance by controlling the variable inductance of the wireless power receiver.

7. The electronic assembly of claim 4, wherein, The control circuit is used to adjust the resistance by controlling the variable equivalent resistance of the wireless power receiver.

8. The electronic assembly of claim 1, wherein, The control circuit is used to adjust the operating frequency of the wireless power transmitter in order to adjust Q.

9. The electronic component as claimed in claim 1, characterized in that, The control circuit is used to adjust at least one of K and Q so that the transfer function from the wireless power transmitter to the wireless power receiver remains monotonic within the frequency range of the drive signal of the wireless power transmitter.

10. The electronic assembly of claim 1, wherein, K is used to adjust the minimum distance between the transmitter coil of the wireless power transmitter and the receiver coil of the wireless power receiver by setting or changing the distance between them.

11. A wireless power communication device, comprising a wireless power transmitter or a wireless power receiver, characterized in that, Includes the electronic components as described in claim 1.

12. A method of controlling a wireless power transmitter or a wireless power receiver, characterized by, include: During wireless power transmission, at least one of the coupling coefficient K between the wireless power transmitter and the wireless power receiver and the load quality factor Q of the wireless power receiver is dynamically adjusted so that the product of K and Q is less than a constant, which is less than or equal to 1.

13. The method of claim 12, wherein, The step of adjusting at least one of the coupling coefficient K between the wireless power transmitter and the wireless power receiver and the load quality factor Q of the wireless power receiver includes: The electronic characteristics of the wireless power receiver are measured, and the Q value is adjusted based on these electronic characteristics.

14. The method of claim 13, wherein, The electronic properties include at least one of current, voltage, impedance, and resistance.

15. The method of claim 12, wherein, The step of adjusting at least one of the coupling coefficient K between the wireless power transmitter and the wireless power receiver and the load quality factor Q of the wireless power receiver includes adjusting Q by adjusting at least one of the capacitor, inductor, resistor and load of the wireless power receiver.

16. The method of claim 15, wherein, The capacitor is adjusted by controlling the variable capacitor of the wireless power receiver.

17. The method of claim 14, wherein, The inductance is adjusted by controlling the variable inductance of the wireless power receiver.

18. The method of claim 14, wherein, The resistance is adjusted by controlling the variable resistor of the wireless power receiver.

19. The method as described in claim 12, characterized in that, At least one of K and Q is adjusted so that the transfer function from the wireless power transmitter to the wireless power receiver remains monotonic within the frequency range of the drive signal of the wireless power transmitter.

20. The method of claim 12, wherein, K is adjusted by setting or changing the minimum distance between the transmitter coil of the wireless power transmitter and the receiver coil of the wireless power receiver.

21. A wireless power transfer system, comprising: include: Wireless power transmitter; Wireless power receiver; Wherein, at least one of the wireless power transmitter and the wireless power receiver is used to dynamically maintain at least one of the coupling coefficient K between the wireless power transmitter and the wireless power receiver and the load quality factor Q of the wireless power receiver during wireless power transmission, such that the product of K and Q is less than a constant, said constant being less than or equal to 1.

22. An electronic assembly for use in a wireless power transmitter or a wireless power receiver, characterized by, include: A control circuit is configured to dynamically adjust at least one of the coupling coefficient K between the wireless power transmitter and the wireless power receiver and the load quality factor Q of the wireless power receiver during wireless power transmission, such that the product of K and Q is less than a constant less than or equal to 1, so that the transfer function from the wireless power transmitter to the wireless power receiver remains monotonic within the frequency range of the drive signal of the wireless power transmitter.

23. The electronic component as claimed in claim 22, characterized in that, The control circuit is further used to measure the electronic characteristics of the wireless power receiver and adjust the Q value based on the electronic characteristics.

24. The electronic assembly of claim 23, wherein, The control circuit includes at least one of a current measuring device and a voltage measuring device.

25. The electronic component as claimed in claim 22, characterized in that, The control circuit is used to adjust at least one of the capacitor, inductor, resistor, and load of the wireless power receiver to adjust Q.

26. The electronic component as claimed in claim 25, characterized in that, The control circuit adjusts the capacitor by controlling the variable capacitor of the wireless power receiver.

27. The electronic assembly of claim 25, wherein, The control circuit is used to adjust the inductance by controlling the variable inductance of the wireless power receiver.

28. The electronic assembly of claim 25, wherein, The control circuit is used to adjust the resistance by controlling the variable equivalent resistance of the wireless power receiver.

29. The electronic assembly of claim 22, wherein, The control circuit is used to adjust the operating frequency of the wireless power transmitter in order to adjust Q.

30. The electronic assembly of claim 22, wherein, K is used to adjust the minimum distance between the transmitter coil of the wireless power transmitter and the receiver coil of the wireless power receiver by setting or changing the distance between them.

31. A wireless power communication device, being a wireless power transmitter or a wireless power receiver, characterized in that, Includes the electronic components as described in claim 22.

32. A method of controlling a wireless power transmitter or a wireless power receiver, the method comprising: include: During wireless power transmission, at least one of the coupling coefficient K between the wireless power transmitter and the wireless power receiver and the load quality factor Q of the wireless power receiver is dynamically adjusted so that the product of K and Q is less than a constant, which is less than or equal to 1, so that the transfer function from the wireless power transmitter to the wireless power receiver remains monotonic within the frequency range of the drive signal of the wireless power transmitter.

33. The method as described in claim 32, characterized in that, The step of adjusting at least one of the coupling coefficient K between the wireless power transmitter and the wireless power receiver and the load quality factor Q of the wireless power receiver includes: The electronic characteristics of the wireless power receiver are measured, and the Q value is adjusted based on these electronic characteristics.

34. The method of claim 33, wherein, The electronic properties include at least one of current, voltage, impedance, and resistance.

35. The method of claim 32, wherein, The step of adjusting at least one of the coupling coefficient K between the wireless power transmitter and the wireless power receiver and the load quality factor Q of the wireless power receiver includes adjusting Q by adjusting at least one of the capacitor, inductor, resistor and load of the wireless power receiver.

36. The method as described in claim 35, characterized in that, The capacitor is adjusted by controlling the variable capacitor of the wireless power receiver.

37. The method as described in claim 34, characterized in that, The inductance is adjusted by controlling the variable inductance of the wireless power receiver.

38. The method of claim 34, wherein, The resistance is adjusted by controlling the variable resistor of the wireless power receiver.

39. The method as described in claim 32, characterized in that, K is adjusted by setting or changing the minimum distance between the transmitter coil of the wireless power transmitter and the receiver coil of the wireless power receiver.

40. A wireless power transfer system, comprising: include: Wireless power transmitter; Wireless power receiver; Wherein, at least one of the wireless power transmitter and the wireless power receiver is used to dynamically maintain at least one of the coupling coefficient K between the wireless power transmitter and the wireless power receiver and the load quality factor Q of the wireless power receiver during wireless power transmission, such that the product of K and Q is less than a constant, the constant being less than or equal to 1, so that the transfer function from the wireless power transmitter to the wireless power receiver remains monotonic within the drive signal frequency range of the wireless power transmitter.

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