CN209948799U - Wireless power transmission current sampling processing system with magnetic field regulation and control function - Google Patents
Wireless power transmission current sampling processing system with magnetic field regulation and control function Download PDFInfo
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- CN209948799U CN209948799U CN201921067635.8U CN201921067635U CN209948799U CN 209948799 U CN209948799 U CN 209948799U CN 201921067635 U CN201921067635 U CN 201921067635U CN 209948799 U CN209948799 U CN 209948799U
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Abstract
The utility model relates to a wireless power transmission current sampling processing system with magnetic field regulation and control, include: a DC source for providing power; the current sampling module is connected with the direct current source in series and used for converting a current signal into a voltage signal; the signal generation module is connected with the current sampling module in series and is used for generating a high-frequency signal; the power amplification module is connected with the signal generation module in series; the transmitting coil is connected with the power amplification module in series; the magnetic field control module is connected between the current sampling module and the transmitting coil in series and used for controlling the magnetic field parameters of the transmitting coil; and a receiving coil coupled to the transmitting coil for generating a high frequency alternating voltage signal. The utility model discloses the magnetic field parameter according to sampling voltage's change control transmitting coil improves the transmission efficiency of wireless electric energy, and has realized automatic control.
Description
Technical Field
The utility model relates to a wireless charging system technical field refers in particular to a wireless power transmission current sampling processing system with magnetic field regulation and control.
Background
In recent years, wireless charging technology has been rapidly developed, and has attracted attention from various manufacturers due to characteristics such as non-contact, no-wire connection, and convenience in operation, and various wireless charging products have been successively developed. In general, a complete wireless charging system includes two parts: the wireless power transmission system comprises a wireless power transmitting end and a wireless power receiving end, wherein the transmitting end and the receiving end transmit energy through a magnetic field, the transmitting end and the receiving end are not connected through wires, the transmitting end needs to know the state of the receiving end to adjust power, control signals are transmitted from the receiving end to the transmitting end, the transmitting end needs to be controlled to form a control loop after analysis, and the transmission of the signals is completed through a wireless communication system.
The transmitting end is connected with a direct current source, direct current provided by the direct current source is input to the transmitting coil through the signal generating module and the power amplifying module, the transmitting coil is coupled with the receiving coil to transmit magnetic field energy, the receiving coil further generates a high-frequency alternating voltage signal, and the alternating voltage signal is converted into direct current voltage through rectification and then charges the electric equipment. Because the magnetic field working mode can generate coupling splitting in different coupling states and the working mode frequency changes, the transmission distance between the transmitting coil and the receiving coil is limited to a certain extent under the determined working frequency, and when the transmission distance changes, the magnetic field energy transmission efficiency between the transmitting coil and the receiving coil is low, so that the wireless electric energy transmission efficiency is low.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's defect, provide a wireless power transmission current sampling processing system with magnetic field regulation and control, through magnetic field coupling intensity between regulation and control coupling coil, high-efficient mode is stable at a frequency point, solves the problem that wireless power transmission efficiency is low when transmission distance that transmission distance's restriction leads to between current transmitting coil and receiving coil changes.
The technical scheme for realizing the purpose is as follows:
the utility model provides a wireless power transmission current sampling processing system with magnetic field regulation and control, include:
a DC source for providing power;
the current sampling module is connected with the direct current source in series and used for converting a current signal into a voltage signal;
the signal generation module is connected with the current sampling module in series and is used for generating a high-frequency signal;
the power amplification module is connected with the signal generation module in series;
the transmitting coil is connected with the power amplification module in series;
the magnetic field control module is connected between the current sampling module and the transmitting coil in series and used for controlling the magnetic field parameters of the transmitting coil; and
and the receiving coil is coupled with the transmitting coil and used for generating a high-frequency alternating voltage signal.
The utility model discloses a current sampling processing system adopts magnetic field control module to control transmitting coil's magnetic field parameter, and magnetic field parameter control module is as judging the foundation according to the sampling voltage of the current sampling module of concatenating in the direct current source, when sampling voltage changes, through magnetic field parameter control transmitting coil's magnetic field parameter, improves the transmission efficiency of wireless energy, and has realized automatic control.
The utility model discloses wireless power transmission current sampling processing system with magnetic field regulation and control's further improvement lies in, magnetic field control module includes at least one way voltage comparison circuit, with the singlechip that voltage comparison circuit is connected and at least one way magnetic field parameter control circuit that is connected with the singlechip, magnetic field parameter control circuit with transmitting coil is connected;
and the single chip microcomputer controls the corresponding magnetic field parameter control circuit to be communicated according to the switch control signal output by the voltage comparison circuit so as to control the magnetic field parameter of the transmitting coil.
The utility model discloses wireless power transmission current sampling processing system with magnetic field regulation and control's further improvement lies in, magnetic field parameter control circuit is including the inductance and the electric capacity that concatenate, an opto-coupler control switch is connected to the other end of inductance, through opto-coupler control switch with the singlechip is connected, the other end of electric capacity with transmitting coil connects.
The utility model discloses wireless power transmission current sampling processing system with magnetic field regulation and control's further improvement lies in, opto-coupler control switch still with the power amplification module is connected, just opto-coupler control switch with direct current alternating current converter has concatenated between the power amplification module.
The utility model discloses a wireless power transmission current sampling processing system with magnetic field regulation and control has the further improvement that, the voltage comparison circuit has the multichannel, and the multichannel voltage comparison circuit connects in parallel in the current sampling module;
each voltage comparison circuit comprises a comparator with an input end connected with the current sampling module and a control switch corresponding to the comparator;
a voltage control module is connected between the comparator and the corresponding control switch, and the control switch is connected with the single chip microcomputer;
the other input end of the comparator inputs a corresponding reference voltage, and the comparator is used for comparing and judging the voltage signal and the reference voltage so as to output a high level or a low level;
and the voltage control module is used for controlling the corresponding control switch to be switched on or switched off according to the high level or the low level output by the comparator.
The utility model discloses wireless power transmission current sampling processing system with magnetic field regulation and control's further improvement lies in, still include with the confession that control switch's input is connected produces pulse signal's time sequence control module.
The utility model discloses wireless power transmission current sampling processing system with magnetic field regulation and control's further improvement lies in, still including concatenating in current sampling module with between the signal generation module, supply control the protection circuit module of the working method of signal generation module.
The utility model discloses wireless power transmission current sampling processing system with magnetic field regulation and control's further improves and lies in, the protection circuit module includes the voltage comparison circuit who is connected with the current sampling module, the voltage control module who is connected with the voltage comparison circuit, the first switch and the second switch that are connected and parallelly connected with the voltage control module and the time sequence control module who supplies to produce pulse signal who is connected with the input of first switch and the second switch;
the first switch and the second switch are connected with the signal generation module;
and the voltage control module controls one of the first switch and the second switch to be closed according to the switch control signal output by the voltage comparison circuit, so as to control the working mode of the signal generation module.
Drawings
Fig. 1 is a circuit diagram of the wireless power transmission current sampling processing system with magnetic field regulation and control of the present invention.
Fig. 2 is the circuit diagram of the magnetic field control module and the protection circuit module in the wireless power transmission current sampling processing system with magnetic field regulation and control of the utility model.
Fig. 3 is the circuit diagram of the circuit protection module in the wireless power transmission current sampling processing system with magnetic field regulation and control of the utility model.
Fig. 4 is the utility model discloses wireless power transmission current sampling processing system with magnetic field regulation and control has the current-voltage conversion curve in the wireless power transmission current sampling processing system with magnetic field regulation and control.
Detailed Description
The invention will be further explained with reference to the drawings and the specific embodiments.
Referring to fig. 1, the utility model provides a wireless power transmission current sampling processing system with magnetic field regulation and control for realize the switching of magnetic field control module and to transmission efficiency's optimization, realize that the distance between receiving coil and transmitting coil is variable, and adjust transmitting coil's magnetic field parameter according to the change of distance automatically, ensure wireless power transmission's high efficiency with this. The utility model discloses a sampling processing system is according to the voltage range who judges current sampling module department, with voltage range and magnetic field control parameter phase-match, corresponds the magnetic field control parameter that a certain voltage range output corresponds promptly and controls transmitting coil for the magnetic field energy of transmitting coil transmission can be adjusted to suitable scope, thereby improves the transmission efficiency of wireless electric energy. The wireless power transmission current sampling processing system with magnetic field regulation and control of the present invention is described with reference to the accompanying drawings.
Referring to fig. 1, a circuit diagram of the wireless power transmission current sampling processing system with magnetic field regulation and control of the present invention is shown. Referring to fig. 2, a circuit diagram of the magnetic field control module and the protection circuit module in the wireless power transmission current sampling processing system with magnetic field regulation and control of the present invention is shown. The wireless power transmission current sampling processing system with magnetic field regulation of the present invention is described with reference to fig. 1 and 2.
As shown in fig. 1 and fig. 2, the wireless power transmission current sampling processing system with magnetic field regulation of the present invention includes a dc source 21, a current sampling module 22, a signal generating module 23, a magnetic field control module 24, a power amplifying module 25, a transmitting coil 26 and a receiving coil 27, wherein the dc source 21 is used for providing a power supply; the current sampling module 22 is connected in series with the direct current source 21, and the current sampling module 22 is used for converting a current signal into a voltage signal; the signal generation module 23 is connected in series with the current sampling module 22, and the signal generation module 23 is used for generating a high-frequency signal; the power amplification module 25 is connected in series with the signal generation module to play a role of power amplification; the transmitting coil 26 is connected with the power amplifying module 25 in series; the magnetic field control module 24 is connected in series between the current sampling module 22 and the transmitting coil 26, and the magnetic field control module 24 is used for controlling the magnetic field parameters of the transmitting coil according to the voltage signal output by the current sampling module 22; the receiving coil 27 is coupled to the transmitting coil 26 for generating a high frequency alternating voltage signal for charging the electric device.
The distance between the transmitting coil 26 and the receiving coil 27 will cause the current at the transmitting end to vary, and usually the farther the distance, the smaller the current, and the closer the distance, the larger the current, so the distance between the transmitting coil 26 and the receiving coil 27 is preferably constant to ensure the transmission efficiency of the electric energy, and when the distance varies, the transmission efficiency will inevitably decrease. In order to overcome this problem, the utility model discloses a magnetic field control module 24 comes the magnetic field parameter according to voltage signal's change control transmitting coil 26 to adjust the magnetic field energy of transmitting coil 26 transmission, ensure the transmission efficiency of electric energy.
In a specific embodiment, as shown in fig. 2, the magnetic field control module 24 of the present invention includes at least one voltage comparison circuit 241, a single chip 242 connected to the voltage comparison circuit 241, and at least one magnetic field parameter control circuit 243 connected to the single chip 242, wherein the magnetic field parameter control circuit 243 is connected to the transmitting coil 26; the single chip microcomputer 242 controls the corresponding magnetic field parameter control circuit 243 to be connected according to the switch control signal output by the voltage comparison circuit 241, so as to control the magnetic field parameter of the transmitting coil 26, and thus, the magnetic field energy transmitted by the transmitting coil 26 is adjusted to adapt to the transmission distance between the transmitting coil 26 and the receiving coil 27.
Preferably, the data set by the magnetic field parameter control circuit 243 is set according to the range of magnetic field parameters to be adjusted, one magnetic field parameter control circuit 243 corresponding to one magnetic field parameter, correspondingly one voltage range and one transmission distance between the transmitting coil 26 and the receiving coil 27. Preferably, the voltage comparison circuit 241 sets data corresponding to the number of the magnetic field parameter control circuits 243, that is, the corresponding voltage range matches the corresponding magnetic field parameter.
In one embodiment, as shown in fig. 2, the magnetic field parameter control circuit 243 includes an inductor and a capacitor connected in series, the other end of the inductor is connected to an optocoupler control switch 244 and connected to the single chip 242 through the optocoupler control switch 244, and the other end of the capacitor is connected to the transmitting coil 26.
The single chip microcomputer 242 controls the on/off of the optocoupler control switch 244 through a voltage control signal output by the voltage comparison circuit 241 to switch on a circuit where the corresponding inductor and capacitor are located, and adjusts the magnetic field energy transmitted by the transmitting coil 26 through the selection of the sizes of the inductor and the capacitor.
In the example shown in fig. 2, the magnetic field parameter control circuit 243 has N circuits, including a third magnetic field parameter control circuit, a fourth magnetic field parameter control circuit and an nth magnetic field parameter control circuit, wherein the third magnetic field parameter control circuit includes a third inductor L3 and a third capacitor C3 connected in series, the fourth magnetic field parameter control circuit includes a fourth inductor L4 and a fourth capacitor C4 connected in series, and the nth magnetic field parameter control circuit includes an nth inductor LN and an nth capacitor CN connected in series.
Correspondingly, the optical coupling control switch 244 is provided with a switch for controlling the on-off of the magnetic field parameter control circuit corresponding to each magnetic field parameter control circuit, and the single chip microcomputer 242 controls the on-off of the corresponding magnetic field parameter control circuit by controlling the on-off of the corresponding switch.
In one embodiment, the optical coupling control switch 244 is further connected to the power amplification module 25, and a dc-ac converter is connected between the optical coupling control switch 244 and the power amplification module 25 in series. The corresponding dc power is converted into ac power by a dc/ac converter and supplied to the power amplification module 25, which in turn supplies ac power to the transmitting coil 26.
In one embodiment, the voltage comparison circuit 241 has multiple paths, and the multiple paths of voltage comparison circuits 241 are connected in parallel to the current sampling module 22;
each voltage comparison circuit 241 comprises a comparator 2411 of which the input end is connected with the current sampling module 22 and a control switch 2413 corresponding to the comparator 2411; a voltage control module 2412 is connected between the comparator 2411 and the control switch 2413, and the control switch 2413 is connected with the single chip microcomputer 242;
the other input end of the comparator 2411 inputs a corresponding reference voltage, and the comparator 2411 is configured to compare the determination voltage signal V0 (output by the current sampling module 22) with the reference voltage to output a high level or a low level;
the voltage control module 2412 is used for controlling the corresponding control switch 2413 to be closed or opened according to the high level or the low level output by the comparator 2411.
The reference voltage of the comparator 2411 is a preset value, and is selected according to the corresponding magnetic field parameters. When the voltage signal V0 that the conversion of current adoption module 22 formed was less than third reference voltage Vref3, the output high level of this corresponding comparator for voltage control module 2412 control corresponding control switch 2413 is closed, thereby has formed voltage control signal and has given singlechip 242, and the voltage change of knowing direct current source 21 department that singlechip 242 can be timely, under pure hardware operating condition, the utility model discloses can realize nanosecond level reaction rate.
Further, the timing control module 2414 is connected to the input terminal of the control switch 2413 for generating a pulse signal. When the corresponding control switch 2413 is closed, the pulse signal generated by the timing control module 2414 is transmitted to the single chip microcomputer 242, so that the single chip microcomputer 242 can timely know the voltage change at the direct current source 21.
In the example shown in fig. 2, there are N voltage comparison circuits 241, including a third voltage comparison circuit, a fourth voltage comparison circuit, and an nth voltage comparison circuit. One input end of a third comparator in the third voltage comparison circuit is connected with the current sampling module 22 and used for inputting a voltage signal V0 output by the current sampling module 22, the other input end of the third comparator is connected with a resistor R5 and a resistor R6, one input end of the third comparator is connected with a 5V power supply, and the reference voltage of the third comparator is set through the resistance values of the resistor R5 and the resistor R6. One input end of the fourth comparator is connected to the current sampling module 22 for inputting the voltage signal V0 output by the current sampling module 22, and the other input end is connected to the resistor R7 and the resistor R8, and further connected to the 5V power supply, and the reference voltage of the fourth comparator is set by the resistances of the resistor R7 and the resistor R8. One input end of the nth comparator is connected with the current sampling module 22 and is used for inputting a voltage signal V0 output by the current sampling module 22, the other input end of the nth comparator is connected with a resistor Rm-1 and a resistor Rm and is further connected with a 5V power supply, and the reference voltage of the nth comparator is set through the resistance values of the resistor Rm-1 and the resistor Rm.
Specifically, the third comparator compares the magnitude of the determination voltage signal V0 with its reference voltage to output a high level or a low level; the fourth comparator compares the magnitude of the judgment voltage signal V0 with its reference voltage to output a high level or a low level; the nth comparator compares the magnitude of the determination voltage signal V0 with its reference voltage to output a high level or a low level.
The voltage control module 2412 is connected to the enable terminal of the corresponding control switch 2413, and controls the control switch to be turned on or off by supplying a high level or a low level to the enable terminal of the corresponding control switch 2413 through the received high level or low level.
In a specific embodiment, the single chip 242 and the voltage control module 2412 work on the same principle, and are connected to the enable terminals of the switches in the optocoupler control switch 244, and the on/off of the switches is controlled by inputting a high level or a low level to the enable terminals of the switches. The switch in the opto-coupler control switch 244 is a high current switch and the control switch 2413 is a low current switch.
In one embodiment, as shown in fig. 2 and 3, the protection circuit module 28 is connected in series between the current sampling module 22 and the signal generating module 23 for controlling the operation mode of the signal generating module 23.
Further, the protection circuit module 28 includes another two voltage comparison circuits 281 connected to the current sampling module 22, a voltage control module 2412 connected to the another two voltage comparison circuits 281, a first switch 282 and a second switch 283 connected to the voltage control module 2412 in parallel, and a timing control module 2413 connected to input terminals of the first switch 282 and the second switch 283 and configured to generate a pulse signal; the first switch 282 and the second switch 283 are connected with the signal generating module 23; the voltage control module 2412 controls one of the first switch 282 and the second switch 283 to be closed according to the switch control signal output by the voltage comparison circuit 281, so as to realize the working mode of the control signal generation module 23.
Preferably, the other two voltage comparison circuits 281 are used for realizing overcurrent and undercurrent protection, detecting the current change at the dc source in real time, and controlling the signal generation module 23 by using the pulse signal in time under the condition of overcurrent or undercurrent, so as to realize the safety of the high-efficiency protection circuit components.
The two other voltage comparison circuits 281 are connected in parallel with the voltage comparison circuit 241 in the magnetic field control module 24, and share one voltage control module 2412 and one timing control module 2414. The other two voltage comparison circuits 281 include a corresponding first comparator 2811 and a second comparator 2812, one input end of the first comparator 2811 is connected to the current sampling module 22, the other input end of the first comparator 2811 inputs a first reference voltage Vref1, and the first comparator 2811 is configured to compare the magnitude of the determination voltage signal V0 with the magnitude of the first reference voltage Vref1 to output a high level or a low level; the second comparator 2812 has an input terminal connected to the current sampling module 22, another input terminal to which the second reference voltage Vref2 is inputted, and the second comparator 2812 is configured to compare the magnitude of the determination voltage signal V0 with the second reference voltage Vref2 to output a high level or a low level.
The first reference voltage Vref1 and the second reference voltage Vref2 are preset values and are selected according to a current limit value. When the voltage signal V0 converted by the current sampling module 22 is smaller than the first reference voltage Vref1, the output terminal of the first comparator 2811 outputs a high level, so that the voltage control module 2412 controls the first switch 282 to close, and the pulse signal generated by the timing control module 243 is transmitted to the signal generating module 23; when the voltage signal V0 is greater than the first reference voltage Vref1 and less than the second reference voltage Vref2, the output terminal of the second comparator 2812 outputs a high level, so that the voltage control module 2412 controls the second switch 283 to close, so that the pulse signal generated by the timing control module 243 is transmitted to the signal generation module 23. Preferably, the input terminal of the first comparator 2811 is connected to the resistor R1 and the resistor R2, and further connected to a 5V power supply; the input end of the second comparator 2812 is connected with a resistor R3 and a resistor R4, and is further connected with a 5V power supply; the voltage values of the first reference voltage Vref1 and the second reference voltage Vref2 are set by setting the resistance values of the resistors R1 to R4.
The voltage signal V0 converted by the voltage sampling module 22 is shown in fig. 3. The utility model provides a comparator is hysteresis comparator. The first switch, the second switch and the control switch are relay switches, electronic switches or optical switches. The signal generating module 23 is a crystal oscillator. The signal generating module 23 is a crystal oscillator. The power amplification module 25 includes a power amplifier tube, an input impedance matching circuit disposed at an input end of the power amplifier tube, a gate bias circuit disposed at a gate of the power amplifier tube, a drain bias circuit disposed at a drain of the power amplifier tube, and an output impedance matching circuit disposed at an output end of the power amplifier tube. Preferably, the power amplifier tube is a field effect transistor. The drain current of the power amplifier tube is formed by a periodic series of pulses, when a driving signal is strong enough, the transistor enters a saturated conduction state, resistance matching is carried out on the front end and the rear end of the power amplifier tube so as to better output energy and reduce wave-assisting loss, and a pulse signal with the same frequency as an input signal is output to finally achieve the effect of power amplification.
The utility model discloses a transmission distance that processing system is adopted to the electric current can in time perception transmitting coil and receiving coil between the change of the voltage signal of module department through the electric current changes to adjust and control transmitting coil's magnetic field parameter in time, in order to ensure the transmission efficiency of radio energy. The overcurrent and undercurrent protection circuit is further arranged, so that circuit components can be efficiently protected, the control scheme is simple, and the working efficiency of the circuit is improved.
The present invention has been described in detail with reference to the embodiments shown in the drawings, and those skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details of the embodiments should not be construed as limitations of the invention, which are intended to be covered by the following claims.
Claims (8)
1. A wireless power transmission current sampling processing system with magnetic field regulation and control is characterized by comprising:
a DC source for providing power;
the current sampling module is connected with the direct current source in series and used for converting a current signal into a voltage signal;
the signal generation module is connected with the current sampling module in series and is used for generating a high-frequency signal;
the power amplification module is connected with the signal generation module in series;
the transmitting coil is connected with the power amplification module in series;
the magnetic field control module is connected between the current sampling module and the transmitting coil in series and used for controlling the magnetic field parameters of the transmitting coil; and
and the receiving coil is coupled with the transmitting coil and used for generating a high-frequency alternating voltage signal.
2. The system for sampling and processing wireless power transmission current with magnetic field regulation and control according to claim 1, wherein the magnetic field control module comprises at least one voltage comparison circuit, a single chip microcomputer connected with the voltage comparison circuit, and at least one magnetic field parameter control circuit connected with the single chip microcomputer, and the magnetic field parameter control circuit is connected with the transmitting coil;
and the single chip microcomputer controls the corresponding magnetic field parameter control circuit to be communicated according to the switch control signal output by the voltage comparison circuit so as to control the magnetic field parameter of the transmitting coil.
3. The system for sampling and processing the wireless power transmission current with magnetic field regulation and control according to claim 2, wherein the magnetic field parameter control circuit comprises an inductor and a capacitor which are connected in series, the other end of the inductor is connected with an optocoupler control switch, the optocoupler control switch is connected with the single chip microcomputer, and the other end of the capacitor is connected with the transmitting coil.
4. The system according to claim 3, wherein the optocoupler control switch is further connected to the power amplification module, and a DC-AC converter is connected in series between the optocoupler control switch and the power amplification module.
5. The system according to claim 2, wherein the voltage comparison circuit has multiple paths, and the multiple paths of voltage comparison circuits are connected in parallel to the current sampling module;
each voltage comparison circuit comprises a comparator with an input end connected with the current sampling module and a control switch corresponding to the comparator;
a voltage control module is connected between the comparator and the corresponding control switch, and the control switch is connected with the single chip microcomputer;
the other input end of the comparator inputs a corresponding reference voltage, and the comparator is used for comparing and judging the voltage signal and the reference voltage so as to output a high level or a low level;
and the voltage control module is used for controlling the corresponding control switch to be switched on or switched off according to the high level or the low level output by the comparator.
6. The system according to claim 5, further comprising a timing control module connected to the input of the control switch for generating a pulse signal.
7. The system for sampling and processing wireless power transmission current with magnetic field regulation of claim 1, further comprising a protection circuit module connected in series between the current sampling module and the signal generating module for controlling the operating mode of the signal generating module.
8. The system according to claim 7, wherein the protection circuit module comprises a voltage comparison circuit connected to the current sampling module, a voltage control module connected to the voltage comparison circuit, a first switch and a second switch connected to the voltage control module and connected in parallel, and a timing control module connected to input terminals of the first switch and the second switch for generating pulse signals;
the first switch and the second switch are connected with the signal generation module;
and the voltage control module controls one of the first switch and the second switch to be closed according to the switch control signal output by the voltage comparison circuit, so as to control the working mode of the signal generation module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921067635.8U CN209948799U (en) | 2019-07-09 | 2019-07-09 | Wireless power transmission current sampling processing system with magnetic field regulation and control function |
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| CN201921067635.8U CN209948799U (en) | 2019-07-09 | 2019-07-09 | Wireless power transmission current sampling processing system with magnetic field regulation and control function |
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| CN209948799U true CN209948799U (en) | 2020-01-14 |
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