CN211377679U

CN211377679U - Wireless charging system

Info

Publication number: CN211377679U
Application number: CN201922121678.6U
Authority: CN
Inventors: 王哲; 贺凡波; 陆钧; 葛俊杰; 马俊超
Original assignee: Beijing Invispower Co Ltd
Current assignee: Hefei Yougan Technology Co.,Ltd.
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-08-28
Anticipated expiration: 2029-11-29

Abstract

The utility model discloses a wireless charging system, which comprises a transmitting terminal and a receiving terminal, wherein the transmitting terminal is provided with a transmitting terminal adjustable unit; the receiving end is provided with a receiving end adjustable unit; the wireless charging system further includes: and the controller is respectively communicated with the transmitting end adjustable unit and the receiving end adjustable unit, and respectively acquires transmitting end electrical parameters and receiving end electrical parameters so as to control the transmitting end adjustable unit to adjust the output transmitting end electrical parameters and control the receiving end electrical parameters output by the receiving end adjustable unit to adjust. The transmitting end and the receiving end are respectively provided with an adjustable unit, and bilateral adjustment is realized through adjustment opposite to the transmitting end and the receiving end. The adjusted timeliness may decrease; the influence of the adjusting range is broken through; and the two sides are adjusted together, so that the adjustment precision is higher.

Description

Wireless charging system

Technical Field

The invention relates to the field of wireless charging, in particular to a wireless charging system.

Background

The wireless charging is a technology for realizing electric energy transmission by utilizing a high-frequency alternating magnetic field between a transmitting end and a receiving end, the technology realizes complete electrical isolation between a load and a power supply, and has the advantages of safety, reliability, flexibility and the like. In various implementation modes of wireless charging, from the viewpoints of transmission efficiency, transmission power, transmission distance and safety, magnetic coupling resonant wireless charging is more suitable for charging high-power loads, such as electric vehicles and other devices.

The magnetic coupling type wireless charging circuit can keep larger output power and efficiency when in a resonance state, but due to the change of system parameters, such as the distance and the relative position of a transmitting coil and a receiving coil can be changed, the working temperature is changed, and the battery is also nonlinearly changed when in charging, the resonance point of the system can be shifted due to the above reasons, so that the charging efficiency is reduced, and even the charging cannot be carried out. Therefore, to maintain the system at an optimal state of charge, adjustments to the parameters are required.

In the prior art, the electrical parameters of the transmitting terminal are generally adjusted to meet the charging requirement of the load terminal, and the control method requires the effectiveness of communication to ensure that the charging state and the charging requirement are acquired at the receiving terminal in real time, and has a certain sampling frequency, so that a closed loop is controlled, which has quite high requirements on the real-time performance and the reliability of a communication system. Some other methods adopt adjustment at the receiving end, which has the disadvantages of relatively low adjustment precision and smaller adjustment range than the control at the transmitting end.

Disclosure of Invention

The invention provides a wireless charging system, which reduces the requirement on communication timeliness in the adjustment of wireless charging and can meet the precision requirement.

The wireless charging system comprises a transmitting end and a receiving end, wherein the transmitting end is provided with a transmitting end adjustable unit; the receiving end is provided with a receiving end adjustable unit; the wireless charging system further includes: and the controller is respectively communicated with the transmitting end adjustable unit and the receiving end adjustable unit, and respectively acquires transmitting end electrical parameters and receiving end electrical parameters so as to control the transmitting end adjustable unit to adjust the output transmitting end electrical parameters and control the receiving end electrical parameters output by the receiving end adjustable unit to adjust.

Preferably, the controller is arranged at the transmitting end; or, the controller is arranged at the receiving end; or the controller is one of a server, a shared server and a cloud server, is connected through a wireless signal, and is independent of the transmitting end and the receiving end.

Preferably, the controller is divided into two parts: one part is a transmitting terminal controller which is arranged at the transmitting terminal and used for acquiring transmitting terminal electrical parameters and controlling a transmitting terminal adjustable unit; the other part is a receiving end controller which is arranged at the receiving end and used for acquiring receiving end electrical parameters and controlling a receiving end adjustable unit; the transmitting end controller and the receiving end controller share all or part of the receiving end electrical parameters.

Preferably, the receiving end further includes: the receiving end sampler is used for acquiring receiving end electrical parameters of the receiving end and sending the receiving end electrical parameters to the controller; the transmitting end further comprises: and the transmitting end sampler is used for acquiring transmitting end electrical parameters of the transmitting end and sending the transmitting end electrical parameters to the controller.

Preferably, the receiving end electrical parameters include: at least one of a charging voltage of a load, a charging current of the load, and a receiving current of a receiving coil; the transmitting end electrical parameter includes at least one of an output current of an inverter, an input voltage of the inverter, an input voltage of a transmitting end converter, and an input current of the transmitting end converter.

Preferably, the transmitting end adjustable unit includes: a transmitting side converter and/or inverter; the transmitting end further comprises: the device comprises a power supply, a transmitting end resonant network and a transmitting coil; the receiving end adjustable unit comprises: a receiving end converter; the receiving end further includes: the device comprises a load, a filter, a receiving end resonant network and a receiving coil.

Preferably, the receiving end further comprises a receiving end driver, which is communicated with the controller and drives the receiving end adjustable unit to adjust the output receiving end electrical parameters under the control of the controller; the transmitting terminal also comprises a transmitting terminal driver which is communicated with the controller and drives the transmitting terminal adjustable unit to adjust the output transmitting terminal electrical parameters under the control of the controller.

The utility model provides a wireless charging system, transmitting terminal and receiving terminal have adjustable unit respectively, realize two side regulations through the regulation to both. Based on the bilateral adjustment, the two sides are respectively adjusted, and the adjustment work of one side is not only depended on, so the adjustment timeliness can be reduced, and the adjustment of the receiving end can make up the 'delay' of the adjustment of the transmitting end; the adjustment result of the transmitting end can directly influence the electrical parameters received by the receiving end, the adjustment range of the receiving end is influenced by the adjustment of the transmitting end, and the secondary adjustment is carried out based on the adjustment range of the transmitting end, so that the influence of the adjustment range is broken through; and the two sides are adjusted together, so that the adjustment precision is higher.

Drawings

Fig. 1 is a schematic structural diagram of a wireless charging system according to the present invention;

fig. 2 is another schematic structural diagram of the wireless charging system according to the present invention;

fig. 3 is a circuit topology diagram of the wireless charging system of the present invention.

Reference numerals:

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.

The application discloses a wireless charging system, and referring to fig. 1, the system is provided with a transmitting terminal T and a receiving terminal R, wherein the transmitting terminal T and the receiving terminal R respectively comprise an adjustable unit, the transmitting terminal T comprises a transmitting terminal adjustable unit, and the receiving terminal R comprises a receiving terminal adjustable unit. The controller P is respectively communicated with the two adjustable units to control the two adjustable units to respectively adjust the electrical parameters output by the two adjustable units. Namely, the transmitting end adjustable unit is controlled to adjust the output transmitting end electrical parameters, and the receiving end electrical parameters output by the receiving end adjustable unit are controlled to adjust.

The connection between the controller P and the transmitting end adjustable unit and the connection between the controller P and the receiving end adjustable unit can be wired connection or wireless connection, and the wireless connection can be realized in multiple modes such as WIFI, cellular data network and Bluetooth as long as the transmission of control signals can be realized.

Of course, the control of the two adjustable units by the controller P is based on the transmitter electrical parameters and the receiver electrical parameters obtained by the controller P, which include electrical parameters at different positions of the receiver R and electrical parameters at different positions of the transmitter T. The contents and acquisition positions of the electrical parameters are specifically included, as will be described in detail below.

The controller P controls the two adjustable units mainly by adjusting parameters-receiving end adjusting parameters and transmitting end adjusting parameters. The receiving end adjustable unit responds to the receiving end adjusting parameter to adjust the output electrical parameter (the output electrical parameter refers to the output electrical parameter of the receiving end adjustable unit); the transmitting end adjustable unit responds to the transmitting end adjusting parameter to adjust the output electrical parameter (the output electrical parameter refers to the output electrical parameter of the transmitting end adjustable unit).

The receiving end adjusting parameters are mainly influenced by the receiving end electrical parameters and directly respond to the receiving end electrical parameters for adjusting. Therefore, the adjusting base and the adjusting target are both receiving end electrical parameters, and belong to local closed loop adjustment. The transmitting end adjusting parameters are not only influenced by the transmitting end electrical parameters, but also related to the receiving end electrical parameters, because the receiving end and the transmitting end are both used for adjusting to ensure that the electrical parameters of the receiving end meet expectations, and therefore the transmitting end adjusting parameters are influenced by the receiving end electrical parameters.

The controller P described above may have various arrangements. The transmitter can be arranged at the transmitting end T independently, and can also be arranged at the receiving end R independently, and no matter which end the transmitter is arranged at, the set position is only influenced, and the working principle of the transmitter is not influenced. When the controller P is provided at the transmitting terminal T, it is included in the power supply T1 provided at the transmitting terminal.

The controller P may also be provided independently of the transmitting end T and the receiving end R, and may exist in one form of a server, a shared server, and a cloud server. In this way, a controller P can be implemented, which can control multiple sets of transmitting terminals (T) and receiving terminals (R). Taking wireless charging of automobiles as an example, one automobile needs a transmitting terminal T and a receiving terminal R to work in a matching way, when a plurality of automobiles are charged, the transmitting terminals T and the receiving terminals R in corresponding quantity work in a matching way, and the transmitting terminals T and the receiving terminals R which work in a matching way can share one controller P. Based on this mode, controller P can concentrate the setting, reduces the space and occupies.

Receiving terminal R and transmitting terminal T can realize the UNICOM with controller P through forms such as internet, mobile cellular data, wifi respectively, and the UNICOM mode that can realize data exchange among the prior art can all be used for the UNICOM that this application mentions here.

In addition to the above setting, the controller P may also set at the receiving end R and the transmitting end T at the same time, that is, work in two parts, referring to fig. 2, one part is a transmitting end controller T7, set at the transmitting end T, obtain the electrical parameters of the transmitting end, and control the adjustable power supply of the transmitting end; the other part is a receiving end controller R7 which is arranged at the receiving end R and used for acquiring receiving end electric parameters and controlling a receiving end adjustable unit. The two parts exist independently, but there may be sharing of information, whether by wired or wireless means. The shared information includes all or part of the receiver electrical parameters, which are needed, as described above, since the transmitter adjustment parameters need to be referenced to the receiver electrical parameters. The partial receiver electrical parameters refer to the portions that need to be referenced. Other parts which do not need to be referred to and the electrical parameters of the transmitting end can select whether to share or not according to the actual situation. That is, the amount of information shared between the transmitting side controller T7 and the receiving side controller R7, the bottom line is a part of the receiving side electrical parameters to be referred to, and other parts may or may not be shared.

For sharing information between the transmitting side controller T7 and the receiving side controller R7, it can also be implemented by communicators — a receiving side communicator R8 and a transmitting side communicator T8. The receiving-end communicator R8 is provided at the receiving end R or integrated with the receiving-end controller R7, and is a part of the receiving-end controller R7. The transmitting end communicator T8 is disposed at the transmitting end T or integrated with the transmitting end controller T7 and is a part of the transmitting end controller T7. The functions are to realize the transmission and sharing of information and realize the functions of receiving and sending, and the specific form is not limited.

The above-mentioned shared information refers to the shared electrical parameters of the receiving end and the electrical parameters of the transmitting end, and hereinafter, since the adjustment parameters of the transmitting end are affected by the electrical parameters of the receiving end, the shared information may be described as "first interactive parameters", which are the electrical parameters of the receiving end to be referred to by the adjustment parameters of the transmitting end.

The setting modes of the various controllers P are optional in the present application, and other setting modes capable of realizing corresponding functions are also applicable. For the way of acquiring the electrical parameters of the receiving end and the transmitting end by the controller P, the receiving end sampler R6 and the transmitting sampler T6 are preferably implemented by samplers in the present application. The receiving end sampler R6 is arranged at the receiving end R, collects receiving end electrical parameters of the receiving end R and sends the receiving end electrical parameters to the controller P (or the receiving end controller R7); the transmitting end sampler T6 is disposed at the transmitting end T, and collects transmitting end electrical parameters of the transmitting end T, and sends the transmitting end electrical parameters to the controller P (or the transmitting end controller T7).

The transmitting end adjustable unit is as follows: a transmitting side converter T2 and/or an inverter T3; the receiving end adjustable unit is as follows: the receiving end rectifies the converter R2. For convenience of explanation, the following may be directly explained with the transmitting-side converter T2, the inverter T3, and the receiving-side rectifying converter R2. The transmitting end adjustable unit and the receiving end adjustable unit simply understand that the output data can be adjusted. The specific adjustment method will be described in detail below.

The structure of the wireless charging system, and the operational relationship between these structures are explained in detail below. For ease of understanding, wireless charging of an electric vehicle will be used as an example below.

Referring to fig. 1, a transmitting terminal T and a receiving terminal R of a relatively complete wireless charging system respectively include various components. The transmitting terminal T comprises a power supply T1, a transmitting terminal converter T2, an inverter T3, a transmitting terminal resonant network T4 and a transmitting coil T5; the receiving end R comprises a load R1, a receiving end rectifying converter R2, a filter R3, a receiving end resonant network R4 and a receiving coil R5.

For the wireless charging of the electric automobile, the transmitting end T is the ground end, and the receiving end R is the automobile end. For convenience of description, wireless charging of an electric vehicle will be described as an example.

In the transmitting terminal T, the power supply T1 generally refers to a power supply used at any time during charging, and may be a power supply accessed through a municipal power grid. And then a transmitting end converter T2, an inverter T3, a transmitting end resonant network T4 and a transmitting coil T5 are connected in sequence. Ac power is input from a power supply T1, transmitted to a receiving terminal R through a transmitting terminal T, and finally supplied to a load R1 (typically a battery). The input of the transmitting end converter T2 is connected with the power supply T1, the output of the transmitting end converter T2 is connected to the input end of the inverter T3, and is connected with the transmitting coil T5 after passing through the transmitting end resonant network T4.

And a receiving coil R5 of the receiving end R is connected with a receiving end resonant network R4 and then connected with a receiving end rectifying converter R2 and a filter R3, and the filter R3 is connected with a load R1.

The input ac power is adjusted by an internal circuit of the transmitting end converter T2 and a power factor and then converted into dc power by ac power (the rectifier is implemented, the transmitting end converter T2 includes a rectifier and a converter for adjusting the rectified dc power, which will be described later), the dc power is converted into high-frequency ac power by the inverter T3, the high-frequency ac power is input to the transmitting end resonant network T4 and the transmitting coil T5 to generate an alternating magnetic field, the vehicle-mounted receiving coil R5 induces the magnetic field to generate induced ac power, and the ac power is transmitted to the receiving end rectifying converter R2 and the filter R3 to be converted into dc power, and then transmitted to the load R1 to charge the load R1.

The above is the basic configuration in wireless charging, and naturally includes the above-described receiver sampler R6 and the like. According to different embodiments, a controller P may be provided, or separate receiving side controller R7 and transmitting side controller T7 may be provided, including corresponding communicators, i.e., the receiving side communicator R8 and the transmitting side communicator T8 described above. In addition, the controller P (or the receiving end controller R7 and the transmitting end controller T7) needs to realize a certain calculation function, and calculates corresponding adjustment parameters according to the receiving end electrical parameters and the transmitting end electrical parameters, so that a calculation unit C is also needed

The above components are described as a transmitting end T and a receiving end R. For convenience of explanation, the following description will explain the controller P as a separate receiving side controller R7 and transmitting side controller T7. While for other embodiments, the manner of using one controller P, the following form is not in conflict therewith, and for the sake of convenience of understanding, the receiving side controller R7 and the transmitting side controller T7 may be understood as constituent parts of the controller P, but this does not imply a limitation on the composition of the controller P.

The components of the receiving end R are explained first:

and the receiving end sampler R6 is used for acquiring receiving end electrical parameters of the receiving end R. The data collected by the receiver sampler R6, i.e. the data of the receiver electrical parameters, at least include the charging voltage U1 of the load R1 and the charging current I1 of the load R1. The sampling position is generally fixed, the charging voltage U1 is collected before the filter R3, and the charging current I1 is collected after the filter R3. The charging voltage U1 and the charging current I1 are electrical parameters of the load during the current charging operation. Besides, the data collected by the receiver sampler R6 may include the receiving current I5 of the receiving coil R5, and the sampling position may be behind the receiver resonant network R4.

The receiver controller R7 (or the controller P used in other embodiments) is connected to the receiver sampler R6, obtains the receiver electrical parameters, and generates, in combination with the given electrical parameters: and the receiving end adjusts the parameters. The given electrical parameters include: a given voltage Up when charging the load R1 and a given current Ip when charging the load R1, i.e. the voltage and current rating of the load R1 when charging. When the voltage and current requirements are met, the charging efficiency and the charging safety are in the optimal state. There will also be pre-formed frequencies and pre-formed phases which are a guarantee that the transmit coil T5 and the receive coil R5 will operate efficiently.

The receiver controller R7 has a calculation unit C for integrating and calculating the above parameters, where the calculation is not limited to the conventional mathematical calculation of addition, subtraction, multiplication, division, integration, proportion, and differentiation, but also includes the empirical calculation of distribution estimation, distribution numerical value, etc., and the empirical calculation may be manually set, or the receiver controller R7 may automatically learn and update according to a database. In addition to the calculation, the receiver controller R7 has a control function, and mainly transmits the receiver adjustment parameter to a designated unit so that it operates according to the requirements related to the receiver adjustment parameter. The sink driver R9 may be part of the sink controller R7, which may be understood as being done by the sink controller R7; the receiving end driver R9 may also be independently arranged, and the receiving end controller R7 completes control with the assistance of the receiving end driver R9 — the receiving end controller R7 is communicated with the receiving end driver R9, so that the receiving end driver R9 obtains the receiving end adjustment parameters provided by the receiving end controller R7, and then controls the corresponding components by the receiving end adjustment parameters. At the receiving end R, the receiving end adjustable unit is mainly a receiving end rectifying converter R2, and the receiving end rectifying converter R2 is connected with a receiving end controller R7 (connected with the receiving end controller R7, because the receiving end driver R9 may be a component of the receiving end controller R7) or a receiving end driver R9 according to different embodiments, so as to obtain receiving end adjusting parameters, and work accordingly. The receiving-end driver R9 functions as a driver.

It should be noted that the receiving-end adjustment parameters include various adjustment information. Or, for various parameters needing to be adjusted, the parameters are included in the receiving end adjustment parameters. As will be mentioned later, the receiving-end regulation parameter may be calculated between the charging voltage U1, the charging current I1, and the given voltage Up, the given current Ip. The receiving phase and the receiving frequency are obtained through the receiving current I5 of the receiving coil R5, receiving end adjusting parameters are obtained through the receiving phase and the prefabricating phase, and receiving end adjusting parameters can also be obtained through the receiving frequency and the prefabricating frequency. As can be known from the above, the receiving-end adjustment parameters can be used to adjust the current, the voltage, the phase and the frequency, and through different data calculations, a plurality of adjustment parameters can be obtained, which are used for different adjustment objects.

The receiving-end communicator R8 is communicated with the receiving-end controller R7. For at least transferring and sharing the information needing to be shared. These shared parameters, referred to as first interaction parameters, are shared by two communicators. It should be noted that the first interaction parameter may include, in addition to the receiver electrical parameter, a processed, calculated or modulated electrical parameter, which may be different from the receiver electrical parameter, but includes a corresponding processing, calculation or modulation result, which can be read and used by the controller P or the transmitter controller T7 (in the following, the content of the parameter used when the first interaction parameter is processed, calculated or modulated will be described in relation to the adjusting method). The first interactive parameter may be calculated at the side of the receiver controller R7 and sent to the transmitter controller T7, or the corresponding receiver electrical parameter may be sent to the transmitter controller T7, and the transmitter controller T7 calculates the first interactive parameter by itself. Of course, no distinction is made when using the controller P.

The following describes the device of the transmitting terminal T:

and the transmitting end sampler T6 is used for acquiring transmitting end electrical parameters of the transmitting end T. The data collected by the transmit side sampler T6 includes at least the output current I3 of the inverter T3, the input voltage U3 of the inverter T3, the input voltage U2 of the transmit side converter T2, and the input current I2 of the transmit side converter T2. The sampling positions are also generally fixed, and the output current I3 between the inverter T3 and the transmitting-side resonant network T4, the input voltage U3 before the inverter T3, the input voltage U2 between the transmitting-side converter T2 and the power supply T1 (i.e., the input voltage U2 of the transmitting-side converter T2) and the input current I2 are set.

And the transmitting end controller T7 is communicated with the transmitting end sampler T6, acquires the transmitting end electrical parameters and generates by combining the first interactive parameters: and adjusting parameters by the transmitting terminal. The first interactive parameter is transmitted by the receiving end communicator R8 and the transmitting end communicator T8, the transmitting end communicator T8 is connected to the transmitting end controller T7, and the first interactive parameter is transmitted to the transmitting end controller T7.

The transmitting side controller T7 also has a calculating unit C, which works in the same manner as the receiving side controller R7 has the calculating unit C, but based on different adjustment objects, the calculation process and the data used are different, and the calculation result is also for different adjustment objects.

The transmitting end controller T7 may send the transmitting end tuning parameters to the designated units to operate according to the requirements associated with the transmitting end tuning parameters. The control may be performed directly by the transmitter side controller T7 (i.e., directly sending the transmitter side tuning parameters to the target to be tuned, in which case the transmitter side driver T9 may be a component of the transmitter side controller T7), or may be performed as a separate component by the transmitter side driver T9, and the control function is assisted by, for example, the transmitter side driver T9 — the transmitter side controller T7 is in communication with the transmitter side driver T9, so that the transmitter side driver T9 obtains the transmitter side tuning parameters provided by the transmitter side controller T7, and controls the corresponding component by the transmitter side tuning parameters. The transmitting side driver T9 may be an integral part of the transmitting side controller T7. The transmitter driver T9 functions as a driver, and the transmitter tuning parameter is used to pass parameters, so its current may be weak, which may not be enough to drive the tuned target, thus requiring the transmitter driver T9 to function as a driver (the receiver driver R9 is similar, please refer to the description in this paragraph, and be equally understood).

In addition, in addition to the emitter driver T9, an emitter auxiliary driver T9a is also provided at the emitter T, which has the same principle as the emitter driver T9 but has different adjustment objects, and the structure, operation and arrangement thereof are the same as the emitter driver T9, and thus are not described again.

At the transmitting end T, the transmitting end adjustable unit includes a transmitting end converter T2, but may also be an inverter T3. Since the two are adjusted differently in content, there may be a transmitting side auxiliary driver T9a in addition to the transmitting side driver T9. The transmitting side auxiliary driver T9a functions the same as the transmitting side driver T9, both of which are used on different adjustment objects. The transmitting side driver T9 acts on the transmitting side converter T2 to adjust the output voltage, and the transmitting side auxiliary driver T9a acts on the inverter T3 to mainly adjust the phase of the alternating current. The transmitting end auxiliary driver T9a and the transmitting end driver T9 may be an integral structure, have two functions, or be two independent parts. The transmitting end converter T2 and the inverter T3 are connected with the transmitting end controller T7 or the transmitting end driver T9, the inverter T3 and the transmitting end controller T7 or the transmitting end auxiliary driver T9a according to different embodiments, so that receiving end adjusting parameters are obtained and the receiving end adjusting parameters are worked.

The above-mentioned sink driver R9 and the emitter driver T9 (including the emitter auxiliary driver T9a) may be preferably implemented using a driving circuit.

As described above, the sink driver R9 may be part of the sink controller R7, and the emitter driver T9 and the emitter auxiliary driver T9a may be part of the emitter controller T7. Besides, the receiving-end driver R9 may also be a regulated object, such as part of the receiving-end rectifying converter R2. The firing side driver T9 is part of the firing side converter T2, and the firing side auxiliary driver T9a is part of the inverter T3. That is, the target to be adjusted, including the driving portion for adjustment, receives the corresponding adjustment parameter and performs the adjustment operation.

A filter is arranged between the transmitting end sampler T6 and the transmitting end controller T7; a filter is also provided between the receiving-end sampler R6 and the receiving-end controller R7. And filtering the acquired electric signals through a filter and then respectively sending the electric signals to corresponding samplers. The filters may also be integrated on the transmit side sampler T6 and the transmit side controller T7, which are integral parts of the transmit side sampler T6 and the transmit side controller T7. In any setting mode, the filter filters the parameters collected by the sampler.

The transmitting-side sampler T6 and the receiving-side sampler R6 may be separate sampling devices or may be sampling circuits. The method can be divided into current sampling and voltage sampling according to the type of collected data.

As can be understood from the above, the transmitting side converter T2, the receiving side rectifying converter R2 and the inverter T3 are all adjustable. Preferably, the inverter T3 is a DC-AC converter that converts input direct current into alternating current. The transmitting-side converter T2 and the receiving-side rectifying converter R2 are AC-DC converters that convert input alternating current into direct current of fixed or adjustable voltage.

The transmitting side converter T2 includes a dc converter in addition to a rectifier for converting ac to dc. The rectifier can be realized by adopting a rectifying circuit; the DC converter may be implemented by a rectifying and converting circuit (DC-DC circuit), the DC-DC circuit may be a BUCK/BOOST circuit formed by a BUCK circuit and a BOOST circuit alone or in combination, and the output voltage regulation of the transmitting side converter T2, i.e., the regulation of the input voltage U3 of the inverter T3, may be implemented by the DC-DC circuit. The BUCK and BOOST circuits mentioned here may be regulated via a transmit side controller T7 (or a transmit side driver T9) to implement voltage ramping.

The receiving end rectifying converter R2 adopts an active controllable rectifying mode, and is internally provided with a BUCK circuit and a BOOST circuit which are formed by a BUCK circuit and a BOOST circuit separately or in combination. The BUCK circuit and the BOOST circuit mentioned here may be regulated via a receiving end controller R7 (or a receiving end driver R9) to realize voltage rise and fall changes.

The inverter T3, the transmitting end converter T2, and the receiving end rectifier converter R2 realize the change between dc and ac, and the change process is controlled by the driving signal, that is, the control signal sent by the receiving end controller R7 (or receiving end driver R9), the transmitting end controller T7 (or transmitting end driver T9), the control signal may directly adopt the receiving end adjusting parameter or transmitting end adjusting parameter, or may be processed, and the signal including the content of the receiving end adjusting parameter or transmitting end adjusting parameter, such as PWM pulse signal, is input to the corresponding port through the receiving end driver R9 or transmitting end driver T9.

The wireless charging system of the present application has means for regulation at both the transmitting terminal T and the receiving terminal R, i.e., a transmitting terminal controller T7 (or a transmitting terminal driver T9) and a receiving terminal controller R7 (or a receiving terminal driver R9), respectively. The receiving end R can be adjusted by itself, meanwhile, the first interaction parameter is sent to the transmitting end T, and the receiving end R is combined with the first interaction parameter to adjust the electrical parameter of the receiving end R. And the parameters can approach the target stably by adjusting the two sides together.

Since both sides are adjusting, the time-efficiency requirement for the two-sided communication can be reduced, and even if the adjustment of the transmitting terminal T is delayed, it can be compensated by the adjustment of the receiving terminal R. That is, the communication between the receiving-side communicator R8 and the transmitting-side communicator T8 may have a granularity that does not affect the overall operation of the adjustment even if the communication is interrupted for a certain period of time.

The system adopts a mode of independent closed-loop control of the transmitting end and the receiving end, single-side control is cancelled, and closed-loop control is realized through communication feedback signals. For example, in the unilateral adjustment, once a fault occurs, a danger may also occur, for example, the power suddenly increases due to the adjustment fault of the transmitting terminal, and the charging safety of the receiving terminal is affected because the communication between the transmitting terminal T and the receiving terminal R has no real-time feedback. For example, the receiving end fails to adjust, and the transmitting end cannot stop working, which may cause danger. Bilateral regulation can be avoided, and one side regulation breaks down, and the regulation of opposite side still can make wireless work of charging, can maintain the mode before the trouble at least, avoids the adverse effect that transient electrical parameter changes and brings.

Fig. 3 is an alternative embodiment of a preferred two-sided wireless charging system circuit topology. Both the transmitting side resonant network T4 and the receiving side resonant network R4 may be of LCC-LCC structure, and for convenience of description, the transmitting side resonant network T4 and the receiving side resonant network R4 are collectively referred to as resonant networks, and unless otherwise specified, the following description of the resonant networks applies to both the transmitting side resonant network T4 and the receiving side resonant network R4. Meanwhile, the transmitting coil T5 and the receiving coil R5 are collectively referred to as coils.

The transmitting-side resonant network T4 has a transmitting-side first compensation capacitor TC1 and a transmitting-side compensation inductor TL1 connected in series with the transmitting coil T5, and a transmitting-side second compensation capacitor TC2 connected in parallel with the transmitting coil T5, the parallel transmitting-side second compensation capacitor TC2 being located between the transmitting-side first compensation capacitor TC1 and the transmitting-side compensation inductor TL 1. Similarly, the receiving end resonant network R4 has a receiving end first compensation capacitor RC1 and a receiving end compensation inductor RL1 connected in series with the receiving coil R5, and a receiving end second compensation capacitor RC2 connected in parallel with the receiving coil R5, the parallel receiving end second compensation capacitor RC2 being located between the receiving end first compensation capacitor RC1 and the receiving end compensation inductor RL 1.

The above-mentioned first compensation capacitor TC1 at the transmitting end, the second compensation capacitor TC2 at the transmitting end, the compensation inductor TL1 at the transmitting end, the first compensation capacitor RC1 at the receiving end, the second compensation capacitor RC2 at the receiving end, and the compensation inductor RL1 at the receiving end can all adopt fixed values, and specific values are determined by parameters of a coil and a resonant network, so that the system realizes rated power output under a rated input voltage condition, and meets the working condition of the inverter T3.

The receiving end rectifying converter R2 is a bridgeless Boost scheme, as shown in fig. 3, two Boost converters exist in the circuit, each Boost converter works in a half cycle of the input voltage, when the input current is positive, the diode and the switching tube of one group work, and the inductor at the front stage plays a role in converting the Boost voltage, and the diode and the switching tube of the other group are in a reverse cut-off state; when the input current is negative, the opposite is true.

The adjustment of the wireless charging system is achieved through bilateral adjustment. For a wireless charging system of the dual-sided LCC network topology, the relationship between the input current I4 of the receiving-side rectifying converter R2 and the output voltage U4 of the inverter T3 can be obtained very easily:

i4 ═ U4 × M/(j ω L1 × L2) … … formula 1

The output voltage U4 of the inverter T3 may be taken between points AB in fig. 3. M is the mutual inductance between the transmitter coil T5 and the receiver coil R5, L1 is the inductance of the transmitter compensation inductance TL1 in the transmitter resonant network T4, L2 is the inductance of the receiver compensation inductance RL1 in the receiver resonant network R4, and ω is the resonant frequency.

As can be seen from the above equation 1, for the determined wireless charging system, that is, in the case that the receiving-end compensation inductor RL1, the transmitting-end compensation inductor TL1, the resonant frequency, and the mutual inductance M of the transmitting coil T5 and the receiving coil R5 are fixed, the value of the input current I4 of the receiving-end rectifier converter R2 is determined by the output voltage U3 of the inverter T3, and the voltage U3 depends on the input voltage U3 of the inverter T3, that is, the input current I4 of the receiving-end rectifier converter R2 can be controlled by adjusting the output voltage of the transmitting-end converter T2, and the adjustment of the charging power can be realized.

Based on the bilateral LCC compensation topological characteristic, the input of the receiving end rectifying converter R2 can be regarded as a voltage-controlled constant current source, and the charging voltage and current can be further controlled by controlling the receiving end rectifying converter R2.

For a wireless charging system, there is also a host control system, which controls the operation of the transmitting end T or the receiving end R as a whole, for example, the given parameters mentioned above can be provided by the host control system. And the charging may be controlled to stop at least when the sampled values of the charging voltage U1 and the charging current I1 exceed the threshold values. The upper control may be provided independently, or each function may be loaded to the transmitting side controller T7 or the receiving side controller R7.

To the utility model discloses, its overall structure can set up to:

the transmitting end has: a power supply T1; the transmitting end converter T2 is communicated with a power supply T1, converts alternating current into direct current and transmits the direct current to the inverter T3; the inverter T3 is communicated with the transmitting end converter T2 to convert the direct current into alternating current and output the alternating current to the transmitting end resonant network T4; and the transmitting coil T5 is communicated with the transmitting end resonant network T4. The transmitting end sampler T6 is communicated with the controller P, acquires the electrical parameters of the transmitting end and sends the parameters to the controller P; the transmitting end driver T9 and/or the transmitting end auxiliary driver T9a are communicated with the controller P and also communicated with the transmitting end adjustable unit.

The receiving end R comprises: the receiving coil R5 and the transmitting coil T5 are coupled to generate an alternating current; the receiving end resonant network R4 is communicated with the receiving coil R5; the receiving end rectifying converter R2 is communicated with the receiving end resonant network R4; the filter R3 is connected with the receiving end rectifying converter R2, and the load R1 is connected with the filter R3. The receiving end sampler R6 is communicated with the controller P, collects the electrical parameters of the receiving end and sends the parameters to the controller P; the transmitting end driver T9 is connected to the controller P and also to the receiving end adjustable unit.

When the controller is divided into two parts, a transmitting side driver T9 and a receiving side driver R9, the two parts also communicate.

Next, the wireless charging adjustment method of the present application will be described with reference to the above wireless charging system. As for some methods mentioned in the above-mentioned wireless charging system, for example, using a BUCK circuit and a BOOST circuit to implement step-up/step-down, etc., all of them can be applied in the following method.

The wireless charging adjusting method comprises the following steps: and acquiring the electrical parameters of the transmitting end and the electrical parameters of the receiving end, and controlling the adjustable unit of the transmitting end by combining the given parameters so as to adjust the output electrical parameters of the transmitting end, and controlling the adjustable unit of the receiving end so as to adjust the output electrical parameters of the receiving end.

Specifically, the method comprises the steps of obtaining the electrical parameters of the receiving end R, and generating by combining the given electrical parameters: the receiving end adjusts the parameters, and adjusts the electrical parameters output by the receiving end adjustable unit according to the receiving end adjusting parameters; and acquiring the transmitting end electrical parameters of the transmitting end T, combining part or all of the receiving end electrical parameters to generate transmitting end adjusting parameters, and adjusting the electrical parameters output by the transmitting end adjustable unit according to the transmitting end adjusting parameters. Here, the first interaction parameter is used in combination with some or all of the receiver electrical parameters. For ease of understanding, the receiving end R and the transmitting end T will be separately described.

The method for adjusting the receiving end R is described with reference to the components in the wireless charging system, and the components of the receiving end R are introduced as the main body of the execution method for convenience of understanding, and the method is not limited to be implemented only by the structure described in the wireless charging system. Other systems capable of implementing wireless charging adjustment by applying the method are also within the protection scope of the present application.

The adjusting method mainly comprises the following steps: responding to the receiving end adjusting parameters, and enabling the receiving end adjusting unit to adjust the output electrical parameters; responding to the transmitting end adjusting parameter, and enabling the transmitting end adjustable unit to adjust the output electrical parameter; and the transmitting end adjustment parameters are related to the receiving end electrical parameters of the receiving end R.

Specifically, the receiving end electrical parameters of the receiving end R may be obtained through the receiving end sampler R6, and in combination with the above description, the contents that these electrical parameters may include are already known, and are not described again. The receiver controller R7 operates on the receiver electrical parameter and the given electrical parameter to generate a receiver tuning parameter, and in some embodiments, a first interaction parameter. The receiving end adjusting parameters are applied to the receiving end adjustable unit (on the receiving end rectifying converter R2) through the receiving end controller R7 or the receiving end driver R9, so that the electric parameters such as the voltage and the current output by the receiving end adjustable unit are correspondingly adjusted. These adjusted voltages and currents are used as new charging voltage U1 and charging current I1 for load R1, and are collected again to form a gradual closed-loop regulation, so that the wireless charging process is more stable and efficient.

The adjustment mode of the transmitting terminal T is explained based on the receiving terminal R. The transmitting terminal T obtains the transmitting terminal electrical parameters through the transmitting terminal sampler T6, and the transmitting terminal controller T7 calculates the transmitting terminal electrical parameters and the first interaction parameters to generate transmitting terminal adjusting parameters. The transmitting terminal controller T7 or the transmitting terminal driver T9 adjusts the transmitting terminal adjustable unit according to the transmitting terminal adjusting parameter. The transmitting end adjustable unit is mainly a transmitting end converter T2 and can also comprise an inverter T3. At the transmitter T, the regulation of the transmitter converter T2 can affect the voltage at its output, i.e. the input voltage U3 of the inverter T3, and the regulation of the inverter T3 can affect its output current I3, which directly affects the operation of the transmitter coil T5. It can be seen that the inverter T3 is subjected to the regulation control of the firing end converter T2 in addition to the regulation control of the firing end controller T7 or the firing end driver T9. However, these results should be the results of the operation of the transmitter side controller T7, which belong to the controllable range, that is, the results of the operation of the transmitter side controller T7 include the above two effects on the inverter T3, and the adjustment on the inverter T3 is obtained by integrating the two effects. As a result of the regulation, the output current I3 of the inverter T3 will be collected continuously, and a similar closed-loop regulation is formed, although the regulation is affected by the first interactive parameter, and thus is different from the closed-loop regulation of the receiving end R.

The following describes a method for generating the adjustment parameter at the receiving end. The receiving end adjusting parameters may include various parameters to adjust different electrical parameters, such as voltage, frequency, etc. In the method of the present application, at least one receiving end is used to adjust parameters.

Three preferred receiver-side tuning parameters are described below.

The first method comprises the following steps:

a charging voltage U1 of the load R1, a charging current I1 of the load R1, a given voltage Up when charging the load R1, and a given current Ip when charging the load R1 are obtained.

Calculating the charging voltage U1 and the given voltage Up to obtain a voltage difference parameter, calculating the voltage difference parameter and the given current Ip to obtain a current estimation parameter, and calculating the current estimation parameter and the charging current I1 to obtain a receiving end adjusting parameter.

And the second method comprises the following steps:

acquiring a receiving current I5 of a receiving coil R5, and acquiring a corresponding receiving phase; and calculating the receiving phase and the prefabricated phase to obtain a receiving end adjusting parameter.

And the third is that:

acquiring a receiving current I5 of a receiving coil R5, and acquiring a corresponding receiving frequency; and calculating the receiving frequency and the prefabricated frequency to obtain the receiving end adjusting parameters.

For convenience of understanding, the first receiving end adjustment parameter generation process is shown in a simple operation relationship, and it should be noted that, here, the operation process is only for convenience of understanding, and the operation manner used in the operation process is not limited.

The charging voltage U1 and the given voltage Up are calculated to obtain a voltage difference parameter, which can be defined as:

calculating the voltage difference parameter and the given current Ip to obtain a current estimation parameter, wherein the current estimation parameter can be defined as:

calculating the current estimation parameter and the charging current I1 to obtain a receiving end adjustment parameter, where the adjustment parameter may be defined as:

the above equations 2 to 4 are merely examples for easy understanding, and in the actual adjusting process, the calculation of the adjusting parameters needs to be considered more, for example, the adjusting parameters are influenced by frequency, environmental temperature, different vehicle types, and the like. The three formulas are only used for convenience of understanding, and indicate that the parameters can obtain the result through certain operation, and the specific operation process and the method used by the operation are not used for limiting the application. For other operation modes, even table look-up comparison can be performed according to different parameters to obtain a final structure, and the method can be applied to the application.

Also, the above three formulas are merely exemplary of the operation process, and the actually output result should be an electric signal that can be recognized, such as a PWM driving signal.

The above manner is a part of the content of the receiving end adjusting parameter, which realizes the adjustment of the voltage and the current. Besides, the receiving end adjusting parameters can adjust the phase and frequency of the current so as to make the receiving coil R5 and the transmitting coil T5 in an optimal resonance state.

In order to realize the adjustment of the phase and the frequency, the receiving current I5 of the receiving coil R5 needs to be acquired, and accordingly, the receiving phase and the receiving frequency of the receiving current I5 (the receiving phase refers to the phase of the receiving current I5, and the receiving frequency refers to the phase of the receiving current I5) can be acquired. For wireless charging, there is a pre-defined phase and pre-defined frequency (which may be part of the given parameters). Calculating the receiving phase and the prefabricated phase to obtain a receiving end adjusting parameter; and calculating the receiving frequency and the prefabricated frequency to obtain the receiving end adjusting parameters.

The latter two receiving end adjusting parameters can be used for the receiving end rectifying converter R2 to realize the adjustment of the frequency and the phase of the current. Besides, the receiving phase can also be used as a first interaction parameter for the transmitting end; the reception frequency and the pre-formed frequency may also be used as the first interaction parameter. In addition, the three receiving-end adjustment parameters may also be used as the first interaction parameter.

The first interaction parameter may also include a plurality of adjustment objectives. For example, a voltage difference parameter and a current difference parameter are used as the first interaction parameter. Or the phase difference parameter and the frequency difference parameter are used as the first interaction parameter. Or the voltage difference parameter, the current difference parameter, the phase difference parameter and the frequency difference parameter are used as the first interaction parameter together. The above-mentioned content can be directly used as the first interaction parameter, or can be integrated and then used as the first interaction parameter, and the integration includes calculation, processing and other modes.

In application, the generation mode of the first interaction parameter may also be obtained in several different manners according to different objects to be adjusted. Similarly, the first interaction parameter and the transmitting end adjustment parameter may also be obtained through calculation, which is not described herein any more, and no matter the first interaction parameter, the transmitting end adjustment parameter, or the receiving end adjustment parameter is calculated, other factors need to be considered, and the specific calculation and how to adjust should be determined according to the requirements in practical application.

The receiver driver R9 (or the receiver controller R7 itself) controls the receiver adjusting parameter, which may be a PWM driving signal, as described above, and may include a duty ratio or a phase shift angle of the PWM driving signal, to control the receiver rectifier converter R2 to operate, for example, to control the on/off of a switching tube and a diode, so as to adjust the output voltage and the output current of the receiver rectifier converter R2 to meet the command value.

At the transmitting terminal T, the transmitting terminal controller T7 performs an operation on the transmitting terminal electrical parameter and the received first interaction parameter to generate a transmitting terminal adjustment parameter. The transmitting side driver T9 (which may also be the transmitting side controller T7 itself) is controlled according to transmitting side regulation parameters, such as using PWM driving signals, including duty cycle or phase shift angle of the PWM driving signals, as described above.

The target of the transmitting end T regulation may be two of the transmitting end converter T2 and the inverter T3. The PWM drive signal may therefore have two parts to enable control of the two parts. Both controlled components may be connected to the same transmitting side controller T7.

One of the two parts is used for regulating the output voltage of the transmitting end converter T, namely the input voltage U3 of the inverter T3, and is equivalent to regulating the output current I3 of the inverter T3. The input voltage U3 of the inverter T3 is regulated to control the output current I3 of the inverter T3, so that the input current I4 required by the receiving-end rectifying converter R2 is obtained, and finally, the required electric energy is supplied to the load R1. The power received by the receiving coil R5 is also regulated at the receiving end R and fed back to the transmitting end T through the receiving end communicator R8 and the transmitting end communicator T8.

The inverter T3 is used to convert the input dc power into ac power with high frequency, which is input to the transmitting coil T5, and this affects the electrical parameters of the receiving end R, so that the receiving end sampler R6 can collect the change, and further the receiving end controller R7 can add the content of adjusting or maintaining the change to the first interaction signal, and provide the first interaction signal to the transmitting end T through bilateral interaction, and finally the PWM driving signal can adjust the phase to a synchronous or matched state, for example, the receiving coil R5 current I5 leads the current output by the transmitting coil T5 (equivalent to the output current I3 of the inverter T3) by 90 °, so that both the transmitting end T and the receiving end R are in a resonant state.

The PWM driving signals of the transmitting end converter T2 and the inverter T3 have frequency regulation, duty ratio regulation, phase shift regulation and other modes, wherein for high-power wireless charging frequency regulation, namely frequency conversion control, strong electromagnetic interference can be generated, and the use of frequency regulation can be limited according to different application scenes. For the fixed frequency control, that is, without adjusting the frequency, or with the step-adjustment within the prescribed frequency range, but always kept stable, since the operating frequency of the alternating electromagnetic field generated in the coil (the transmitting coil T5 and the receiving coil R5) for transmitting the electric power is related to the frequency of the PWM driving signal of the transmitting-side converter T2 and the inverter T3, the pulse frequency of the control signal supplied to the transmitting-side driver T9 and the transmitting-side auxiliary driver T9a (the receiving-side controller R7) is adjusted, and the stability of the operating frequency can be kept. The pulse frequency may cause the transmitting end to adjust the content included in the parameters.

The frequency is fixed without being kept at a fixed value all the time in the charging process, and can be adjusted to a proper working frequency and then fixed when the resonance point shifts due to the change of system parameters, so that strong electromagnetic interference is not generated while the stability of the system is kept.

The receiving end communicator R8 and the transmitting end communicator T8 can communicate in real time and adjust. But non-real-time communication can be applied to this application equally, and this application does not rely on real time communication to accomplish the regulation, and is not high to the requirement of validity, even when two communication intervals are great, arbitrary one side can make the electric parameter satisfy the needs of charging through self regulation.

The receiving end communicator R8 and the transmitting end communicator T8 can realize information transfer by adopting the modes of Bluetooth, WIFI, NFC, radio frequency signals and the like. Alternatively, both also use a coil for signal transmission by electromagnetic effect, but it is necessary to ensure that its operating frequency does not interfere with the frequency of the wireless charging.

In addition, the upper control system of the application also has a self control method, the control method can monitor the wireless charging adjustment method, and the charging process can be forcibly ended when the adjustment method fails, so that the electrical parameter exceeds a threshold value. The control method of the upper control system is not described in detail in the present application, and the principle of the control method is to ensure stable and safe operation of the charging system.

The construction, features and functions of the present invention are described in detail in the embodiments illustrated in the drawings, which are only preferred embodiments of the present invention, but the present invention is not limited by the drawings, and all equivalent embodiments modified or changed according to the idea of the present invention should fall within the protection scope of the present invention without departing from the spirit of the present invention covered by the description and the drawings.

Claims

1. A wireless charging system comprising a transmitting terminal (T) and a receiving terminal (R), characterized in that,

the transmitting terminal (T) is provided with a transmitting terminal adjustable unit;

the receiving end (R) is provided with a receiving end adjustable unit;

the wireless charging system further includes:

and the controller (P) is respectively communicated with the transmitting end adjustable unit and the receiving end adjustable unit and respectively acquires transmitting end electrical parameters and receiving end electrical parameters so as to control the transmitting end adjustable unit to adjust the output transmitting end electrical parameters and control the receiving end electrical parameters output by the receiving end adjustable unit to adjust.

2. The wireless charging system of claim 1,

the controller (P) is arranged at the transmitting end (T); alternatively, the first and second electrodes may be,

the controller (P) is arranged at the receiving end (R); alternatively, the first and second electrodes may be,

the controller (P) is one of a server, a shared server and a cloud server, is connected through a wireless signal and is independent of the transmitting end (T) and the receiving end (R).

3. The wireless charging system of claim 1,

the controller (P) is divided into two parts:

a part is a transmitting terminal controller (T7) which is arranged at the transmitting terminal (T), acquires transmitting terminal electrical parameters and controls the transmitting terminal adjustable unit;

the other part is a receiving end controller (R7) which is arranged at the receiving end (R) and used for acquiring receiving end electrical parameters and controlling a receiving end adjustable unit;

the transmitting end controller (T7) and the receiving end controller (R7) share all or part of the receiving end electrical parameters.

4. The wireless charging system according to any one of claims 1 to 3,

the receiving end (R) further comprises: the receiving end sampler (R6) is used for collecting receiving end electrical parameters of the receiving end (R) and sending the receiving end electrical parameters to the controller (P);

the transmitting terminal (T) further comprises: and the transmitting end sampler (T6) is used for collecting the transmitting end electrical parameters of the transmitting end (T) and sending the transmitting end electrical parameters to the controller (P).

5. The wireless charging system according to any one of claims 1 to 3,

the receiving end electrical parameters include: at least one of a charging voltage (U1) of a load (R1), a charging current (I1) of the load (R1), and a receiving current (I5) of a receiving coil (R5);

the transmitting end electrical parameter comprises at least one of an output current (I3) of an inverter (T3), an input voltage (U3) of the inverter (T3), an input voltage (U2) of a transmitting end converter (T2) and an input current (I2) of a transmitting end converter (T2).

6. The wireless charging system of claim 1,

the transmitting-end adjustable unit comprises: a transmitting side converter (T2) and/or an inverter (T3);

the transmitting terminal (T) further comprises: a power supply (T1), a transmitting end resonant network (T4) and a transmitting coil (T5);

the receiving end adjustable unit comprises: a receiving-end converter (R2);

the receiving end (R) further comprises: the antenna comprises a load (R1), a filter (R3), a receiving end resonant network (R4) and a receiving coil (R5).

7. The wireless charging system of claim 1,

the receiving end (R) also comprises a receiving end driver (R9) which is communicated with the controller (P) and drives the receiving end adjustable unit to adjust the output receiving end electrical parameters under the control of the controller (P);

the transmitting terminal (T) further comprises a transmitting terminal driver (T9) which is communicated with the controller (P), and the transmitting terminal adjustable unit is driven to adjust the output transmitting terminal electrical parameters through the control of the controller (P).