CN113991887A

CN113991887A - Wireless charging transmitting device and wireless charging system

Info

Publication number: CN113991887A
Application number: CN202111200827.3A
Authority: CN
Inventors: 李文华; 赵刚; 马慧杰
Original assignee: Bayi New Energy Technology Shenzhen Co ltd
Current assignee: Bayi New Energy Technology Shenzhen Co ltd
Priority date: 2021-10-14
Filing date: 2021-10-14
Publication date: 2022-01-28

Abstract

The invention discloses a wireless charging transmitting device and a wireless charging system, wherein the wireless charging transmitting device comprises a primary side control module, a primary side rectifying and filtering module, a high-frequency inversion module and a primary side resonant circuit which are sequentially connected; the primary side rectifying and filtering module is provided with an alternating current input end used for being connected with a power frequency power supply and a direct current output end connected with the high-frequency inversion module, and the rectifying and filtering module is used for converting alternating current input by the alternating current input end into direct current and outputting the direct current to the high-frequency inversion module from the direct current output end; the primary side control module is electrically connected with the high-frequency inversion module, outputs a pulse signal to the high-frequency inversion module, controls the high-frequency inversion module to convert direct current output by the rectification filter module into alternating current and outputs the alternating current to the primary side resonant circuit; the primary side resonance circuit converts alternating current output by the high-frequency inversion module into an alternating magnetic field. The technical scheme of the invention has better power supply stability, safety and flexibility.

Description

Wireless charging transmitting device and wireless charging system

Technical Field

The invention relates to the field of wireless transmission of electric energy, in particular to a wireless charging transmitting device and a wireless charging system.

Background

With the development and progress of science and technology, the society has fully entered the era of electrical and informatization, and the transmission of signals has realized a leap from wire to wireless, however, the transmission of electric energy is still mainly through the transmission wire. At present, most of novel electrical equipment (for example, transportation robot) all have higher requirement to stability, security and the flexibility of power supply, because traditional power supply mode is conductor direct contact conduction, have contact unreliable, the exposed potential safety hazard that brings of conductor and multiple drawback such as flexibility difference, can not satisfy novel electrical equipment's power supply demand.

Disclosure of Invention

The invention mainly aims to provide a wireless charging transmitting device to meet the power supply requirement of novel electrical equipment.

In order to achieve the purpose, the wireless charging and transmitting device provided by the invention comprises a primary side control module, a primary side rectifying and filtering module, a high-frequency inversion module and a primary side resonant circuit which are sequentially connected;

the primary side rectifying and filtering module is provided with an alternating current input end used for being connected with a power frequency power supply and a direct current output end connected with the high-frequency inversion module, and the rectifying and filtering module is used for converting alternating current input by the alternating current input end into direct current and outputting the direct current to the high-frequency inversion module from the direct current output end;

the primary side control module is electrically connected with the high-frequency inversion module, outputs a pulse signal to the high-frequency inversion module, controls the high-frequency inversion module to convert the direct current output by the rectification filter module into alternating current and outputs the alternating current to the primary side resonance circuit;

and the primary side resonance circuit converts the alternating current output by the high-frequency inversion module into an alternating magnetic field.

In some embodiments, the primary side rectifying and filtering module comprises a filtering unit, a rectifying unit and a boosting unit which are connected in sequence, the filtering unit has an alternating current input end used for being connected with a power frequency power supply, and the boosting unit has a direct current output end connected with the high-frequency inversion module.

In some embodiments, the filtering unit employs an EMI filtering circuit.

In some embodiments, the boost unit employs a PFC circuit whose operation is controlled by the primary side control module.

In some embodiments, the boosting unit comprises a high-frequency filter capacitor, an energy storage inductor, a first switching tube, a protection diode, a boosting diode and an energy storage capacitor;

the voltage input end of the boosting unit is connected with the voltage output end of the boosting diode through the energy storage inductor and the boosting diode in sequence, the voltage input end of the boosting unit is grounded through the high-frequency filter capacitor, the voltage output end of the boosting unit is grounded through the energy storage capacitor, the anode of the boosting diode is grounded through the first switching tube, and the conduction trigger end of the switching tube is electrically connected with the primary side control module; and the anode of the protection diode is connected with the voltage input end of the boosting unit, and the cathode of the protection diode is connected with the voltage output end of the boosting unit.

In some embodiments, the boost unit further includes an anti-shock protection unit, the anti-shock protection unit is connected in series to a voltage input end of the boost unit, and the primary side control module is electrically connected to the anti-shock protection unit and controls the anti-shock protection unit to switch between a load state and a short-circuit state.

In some embodiments, the anti-shock protection unit includes a relay switch and a current-limiting resistor, the relay switch is connected in series with the voltage input end of the voltage boosting unit, and the current-limiting resistor is connected in parallel with the relay switch; and the primary side control module is electrically connected with the relay switch and controls the on-off of the relay switch.

In some embodiments, the high-frequency inverter module adopts a phase-shifted full-bridge inverter circuit controlled by the primary side control module to work.

In some embodiments, the primary resonant circuit includes a primary coil, a resonant inductor, a first capacitor bank, and two first connection terminals connected to the high-frequency inverter module, the resonant inductor and the primary coil are connected in series between the two first connection terminals, the first capacitor bank is connected in parallel with the primary coil, and the first capacitor bank includes one first resonant capacitor or a plurality of first resonant capacitors connected in parallel.

In some embodiments, the primary resonant circuit is an LC resonant circuit or an LCC resonant circuit.

The invention also provides a wireless charging system, which comprises the wireless charging transmitting device and a wireless charging receiving device coupled with the wireless charging transmitting device.

Preferably, the wireless charging receiving device comprises a secondary resonant circuit and a secondary rectifying and filtering module, and the secondary resonant circuit is electrically connected with the secondary rectifying and filtering module; the secondary resonant circuit generates induction current by inducing an alternating magnetic field generated by the primary resonant circuit and outputs the induction current to the secondary rectifying and filtering module, and the secondary rectifying and filtering module converts the induction current output by the secondary resonant circuit into direct current to output the direct current so as to charge a battery load.

In some embodiments, the secondary resonant circuit includes a secondary coil, a second capacitor bank, and two second connection terminals connected to the secondary rectifying and filtering module, where the secondary coil and the second capacitor bank are connected in series between the two second connection terminals, and the second capacitor bank includes one second resonant capacitor or a plurality of second resonant capacitors connected in parallel.

In some embodiments, the secondary side rectifying and filtering module comprises a secondary side control module, a full-bridge rectifying circuit and a filtering circuit, and the secondary side resonant circuit is connected with the filtering circuit through the full-bridge rectifying circuit; the secondary side control module is electrically connected with the full-bridge rectification circuit and controls synchronous rectification of the full-bridge rectification circuit.

In some embodiments, the full-bridge rectification circuit includes a first bridge arm and a second bridge arm connected in parallel between a first parallel connection point and a second parallel connection point, the first bridge arm includes a first switch unit and a second switch unit connected in series, the second bridge arm includes a third switch unit and a fourth switch unit connected in series, a connection point between the first switch unit and the second switch unit is a first series connection point, a connection point between the third switch pipe and the fourth switch pipe is a second series connection point, the first series connection point and the second series connection point are connected to the secondary side resonance circuit, and the first parallel connection point and the second parallel connection point are connected to the filter circuit;

the secondary side control module is electrically connected with the first switch unit, the second switch unit, the third switch unit and the fourth switch unit respectively to control the on-off of the first switch unit, the second switch unit, the third switch unit and the fourth switch unit.

According to the technical scheme, the power frequency alternating current is converted into direct current through the primary side rectifying and filtering module and is output to the high-frequency inversion module, the direct current output by the primary side rectifying and filtering module is inverted into alternating current through the high-frequency inversion module and is output to the primary side resonance circuit, finally, the alternating current output by the high-frequency inversion module is converted into an alternating magnetic field through the primary side resonance circuit and transmits energy to the novel electrical equipment, and the novel electrical equipment receives the alternating magnetic field energy transmitted by the induction wireless charging and transmitting device through the receiving coil and converts the alternating magnetic field energy into electric energy to supply power to a load. The power supply scheme of the wireless charging transmitting device enables novel electrical equipment to be in contact connection with the novel electrical equipment without a conductor, avoids the problems of unreliable conductor contact and potential safety hazard of an exposed conductor, has better power supply stability and safety, and has better flexibility because the power supply is not limited by contact connection between the novel electrical equipment and the exposed conductor.

Drawings

Fig. 1 is a schematic block diagram of a wireless charging transmitting device according to an embodiment of the present invention;

fig. 2 is a schematic block diagram of a primary side rectifying and filtering module according to an embodiment of the present invention;

fig. 3 is a schematic circuit diagram of a primary side rectifying and filtering module according to an embodiment of the present invention;

fig. 4 is a circuit diagram of a high frequency inverter module according to an embodiment of the invention;

FIG. 5 is a schematic circuit diagram of a primary side resonant circuit according to an embodiment of the present invention;

fig. 6 is a schematic block diagram of a wireless charging system according to an embodiment of the present invention;

FIG. 7 is a circuit diagram of a secondary resonant circuit according to an embodiment of the present invention;

fig. 8 is a schematic block diagram of a wireless charge receiving device according to an embodiment of the present invention;

fig. 9 is a schematic circuit diagram of a full-bridge rectification circuit and a filter circuit according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a wireless charging transmitting device.

Referring to fig. 1, in an embodiment, the wireless charging and transmitting device 100 includes a primary side control module 10, and a primary side rectifying and filtering module 20, a high frequency inverting module 30, and a primary side resonant circuit 40, which are connected in sequence. The primary side rectifying and filtering module 20 has an AC input terminal AC for connecting to a power frequency power supply 01 (e.g., a commercial power grid) and a DC output terminal DC for connecting to the high frequency inversion module 30, and is configured to convert AC input from the AC input terminal AC into DC and output the DC to the high frequency inversion module 30 from the DC output terminal DC; the primary side control module 10 is electrically connected with the high-frequency inversion module 30, the primary side control module 10 outputs a pulse signal to the high-frequency inversion module 30, and controls the high-frequency inversion module 30 to convert the direct current output by the rectification filter module into alternating current and output the alternating current to the primary side resonance circuit 40; the primary resonant circuit 40 converts the alternating current output by the high-frequency inverter module 30 into an alternating magnetic field.

In the operation of the wireless charging and transmitting device 100 of this embodiment, the power frequency AC power of the power frequency power supply 01 is input from the AC input terminal AC of the primary side rectifying and filtering module 20, the primary side rectifying and filtering module 20 performs filtering and rectifying processing on the power frequency AC power and converts the power frequency AC power into DC power, and outputs the DC power from the DC output terminal DC to the high-frequency inverting module 30, the primary side control module 10 outputs a pulse signal (i.e. a driving control signal) to control the high-frequency inverting module 30 to operate, so that the high-frequency inverting module 30 inverts the received DC power into AC power and outputs the AC power to the primary side resonant circuit 40, the soft switching of the high-frequency inverter module 30 is realized through the primary resonant circuit 40, the efficiency of the wireless charging and transmitting device 100 is improved, and the alternating current output by the high-frequency inversion module 30 is converted into an alternating magnetic field with positive linear characteristics through a coil of the high-frequency inversion module, and the alternating magnetic field supplies power to the novel electrical equipment to transfer energy. The new electrical device can be used for a load (for example, charging a battery of the device) only by approaching the wireless charging and transmitting device 100 through the receiving coil to induce the energy of the alternating magnetic field generated by the primary side resonant circuit 40, so as to generate an alternating induced current on the receiving coil, and then rectifying the alternating induced current into a direct current.

The wireless charging transmitting device 100 of this embodiment, convert power frequency alternating current into direct current through the primary side rectification filter module 20 and output for high frequency inverter module 30, invert into alternating current through the direct current of primary side rectification filter module 20 output with high frequency inverter module 30 and output for primary side resonant circuit 40, convert the alternating current of high frequency inverter module 30 output into alternating magnetic field through primary side resonant circuit 40 at last and transmit energy to novel electrical equipment, novel electrical equipment receives the alternating magnetic field energy of the wireless charging transmitting device 100 transmission of response through receiving coil, convert it into the electric energy and supply power for the load. The wireless power supply scheme of the charging and transmitting device 100 of the embodiment enables novel electrical equipment to be connected without contact with the novel electrical equipment through a conductor, avoids the problems that potential safety hazards exist in unreliable conductor contact and exposed conductors, is better in power supply stability and safety, and is better in flexibility due to the fact that no limitation of contact connection exists between the novel electrical equipment and the exposed conductors during power supply.

Referring to fig. 2, in the present embodiment, the primary side rectifying and filtering module 20 includes a filtering unit 21, a rectifying unit 22 and a boosting unit 23 connected in sequence, the filtering unit 21 has an AC input terminal AC for connecting to the industrial frequency power supply 01, and the boosting unit 23 has a DC output terminal DC connected to the high frequency inverting module 30. The filtering unit 21 filters the alternating current output from the alternating current input terminal AC, the rectifying unit 22 rectifies the alternating current filtered by the filtering unit 21, rectifies the alternating current into direct current and outputs the direct current to the boosting unit 23, and the boosting unit 23 boosts the direct current output by the rectifying unit 22 so as to boost the direct current to a preset magnitude (for example, 400V) and output the direct current from the direct current output terminal DC.

In some embodiments, the filtering unit 21 employs an EMI filtering circuit, i.e., an electromagnetic interference filtering circuit.

Referring to fig. 3, the EMI filter circuit employed by the filter unit 21 of the present embodiment includes a common mode choke coil L0, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, and a sixth capacitor C6. Two coils of the common mode choke coil L0 are respectively connected in series with a live wire L and a zero wire N of an alternating current input end AC, and the first to third capacitors C3 and the fourth to sixth capacitors C6 are symmetrically distributed on two sides of the common mode choke coil L0; the first capacitor C1 and the second capacitor C2 are connected in series between a live wire L and a zero line N, two ends of a third capacitor C3 are respectively and electrically connected with the live wire L and the zero line N, two ends of a fourth capacitor C4 are respectively and electrically connected with the live wire L and the zero line N, a fifth capacitor C5 and a sixth capacitor C6 are connected in series between the live wire L and the zero line N, one end of the first capacitor C1 connected with the second capacitor C2 is electrically connected with a ground wire E of an alternating current input end AC, and one end of the fifth capacitor C5 connected with the sixth capacitor C6 is electrically connected with the ground wire E of the alternating current input end AC.

Common mode interference in the circuit is filtered through the combination of the first capacitor C1 and the second capacitor C2 and the combination of the fifth capacitor C5 and the sixth capacitor C6, and series mode interference in the circuit is filtered through the third capacitor C3 and the fourth capacitor C4, so that the problem of noise interference of the circuit is solved.

In addition, in this embodiment, the filtering unit 21 further includes a voltage dependent resistor Ry, and two ends of the voltage dependent resistor Ry are electrically connected to the live line L and the neutral line N, respectively. When the voltage of the AC input end is suddenly changed to be large, the voltage at two ends of the voltage dependent resistor Ry is clamped at a certain value by the voltage dependent resistor Ry, and the circuit is prevented from being damaged by sudden change of the voltage of the AC input end.

In the present embodiment, the rectifying unit 22 employs a full-wave rectifying bridge composed of rectifying diodes. Of course, in other embodiments, the rectifying unit 22 may also adopt a rectifying circuit composed of other devices.

In some embodiments, the boost unit 23 employs a PFC circuit whose operation is controlled by the primary side control module 10. By adopting the PFC circuit, the utilization efficiency of electric energy is greatly improved to more than 0.98, higher harmonics are basically eliminated, and the problem of harmonic pollution and interference to a power grid and other electrical equipment caused by the injection of the higher harmonics into the power frequency power supply 01 is solved.

Referring to fig. 3, in the present embodiment, the boosting unit 23 includes a high-frequency filter capacitor Cs, an energy storage inductor L1, a first switching tube Q1, a protection diode D2, a boosting diode D1, and an energy storage capacitor Cz. The voltage input end Vin of the voltage boosting unit 23 is connected with the voltage output end Vo of the voltage boosting unit through an energy storage inductor L1 and a voltage boosting diode D1 in sequence, the voltage input end Vin of the voltage boosting unit 23 is grounded PGND through a high-frequency filter capacitor Cs, the voltage output end Vo of the voltage boosting unit 23 is grounded PGND through an energy storage capacitor Cz, the anode of the voltage boosting diode D1 is grounded PGND through a first switching tube Q1, and a conduction trigger end of the switching tube is electrically connected with the primary side control module 10; the anode of the protection diode D2 is connected to the voltage input terminal Vin of the voltage boost unit 23, and the cathode is connected to the voltage output terminal Vo of the voltage boost unit 23.

In some embodiments, the voltage boost unit 23 further includes an anti-shock protection unit 231, the anti-shock protection unit 231 is connected in series to the voltage input terminal Vin of the voltage boost unit 23, and the primary side control module 10 is electrically connected to the anti-shock protection unit 231 and controls the anti-shock protection unit 231 to switch between the load state and the short-circuit state. When the anti-shock protection unit 231 is in a load state, the anti-shock protection unit 231 is equivalent to be connected in series with a load on the voltage input end Vin; when the anti-shock protection unit 231 is in a short circuit state, the anti-shock protection unit 231 is equivalent to a short circuit wire connected in series to the voltage input terminal Vin.

When the wireless charging and transmitting device 100 starts working, the primary side control module 10 controls the anti-impact protection unit 231 to be switched to a load state, so that a current limiting effect is achieved on a circuit loop of the boosting unit 23, and impact damage to the boosting unit 23 caused by instantaneous large current during starting is avoided; after the wireless charging and transmitting device 100 is started for a period of time (for example, 5 seconds), the primary side control module 10 controls the anti-impact protection unit 231 to switch to the short-circuit state, so that the load of the anti-impact protection unit 231 is prevented from generating electric energy loss, and the utilization efficiency of the wireless charging and transmitting device 100 on electric energy is ensured.

In some embodiments, the anti-shock protection unit 231 includes a relay switch SW connected in series to the voltage input terminal Vin of the voltage boosting unit 23, and a current limiting resistor Rx connected in parallel to the relay switch SW; the primary side control module 10 is electrically connected with the relay switch SW to control the on-off of the relay switch SW. When the relay switch SW is turned off, the current-limiting resistor Rx of the anti-shock protection unit 231 is connected in series to the voltage input terminal Vin of the voltage boosting unit 23, and is in a load state; when the relay switch SW is turned on, both ends of the current limiting resistor Rx of the anti-shock protection unit 231 are short-circuited, which is a short-circuited state. The current limiting resistor Rx may be a thermistor. It should be noted that, in other embodiments, the anti-shock protection unit 231 may also adopt other devices or circuits that achieve the same function.

In order to protect the safety of the primary side rectifying and filtering module 20, a protection wire F is connected in series to the AC input terminal AC of the primary side rectifying and filtering module 20.

Referring to fig. 4, in the present embodiment, the high-frequency inverter module 30 employs a phase-shifted full-bridge inverter circuit controlled by the primary side control module 10. The phase-shifted full-bridge inverter circuit comprises a direct current input end connected with a direct current output end DC of a primary side rectification filter module 20, an inverter capacitor Cn connected between the direct current input end and the ground in parallel and two inverter bridges, wherein each inverter bridge comprises two NMOS tubes connected in series, the connection point of the two NMOS tubes of one bridge arm is an inverter output end INV1 of a high-frequency inverter module 30, the connection point of the two NMOS tubes of the other bridge arm is the other inverter output end INV2 of the high-frequency inverter module 30, and the two inverter output ends INV1 and INV2 are connected with a primary side resonance circuit 40. The primary side control module 10 is connected with the gates of the NMOS transistors on the two bridge arms, and drives and controls the on/off of each NMOS transistor, so as to control the high-frequency inverter module 30 to work, and output alternating current from two inverter output ends INV1 and INV 2. In order to protect the safety of the high-frequency inverter module 30, the input end of the high-frequency inverter module 30 is connected in series with a protection wire F.

Referring to fig. 5, in the present embodiment, the primary resonant circuit 40 includes a primary coil Lf, a resonant inductor Lx, a first capacitor bank 41, and two first connection terminals J1 connected to the high-frequency inverter module 30, the resonant inductor Lx and the primary coil Lf are connected in series between the two first connection terminals J1, the first capacitor bank 41 is connected in parallel with the primary coil Lf, and the first capacitor bank 41 includes one first resonant capacitor Cx1 or a plurality of first resonant capacitors Cx1 connected in parallel. The two first connection ends J1 correspond to the two inverter output ends INV1 and INV2 of the electrically connected high-level inverter module, respectively. The first capacitor bank 41 in this embodiment includes two parallel first resonant capacitors Cx1 to increase the overcurrent capacity. Of course, in other embodiments, the first capacitor bank 41 may employ a corresponding number of first resonant capacitors Cx1 according to particular needs.

The primary side resonant circuit 40 of the present embodiment is an LCL topology structure formed by the resonant inductor Lx, the first resonant capacitor Cx1, and the primary side coil Lf. The resonance circuit of the LCL topological structure enables the coupling of an alternating magnetic field generated on the primary coil Lf to be better, the coupling range of the alternating magnetic field with the receiving coil to be larger, the coupling distance to be longer, even if the deviation between the receiving coil and the primary coil Lf is larger, the high transmission efficiency can be still kept, and the utilization efficiency of electric energy is better ensured.

In some embodiments, the primary resonant circuit 40 is an LC resonant circuit or an LCC resonant circuit.

In the above embodiment, PWM0, PWM1, PWM2, PWM3 and PWM4 are all driving signals output by the primary side control module 10.

The invention further provides a wireless charging system.

Referring to fig. 6, the wireless charging system of the present embodiment includes a wireless charging receiver 200 and a wireless charging receiver 100 coupled to the wireless charging transmitter 200, wherein the wireless charging receiver 200 is configured to receive an alternating magnetic field generated by the wireless charging transmitter 100, and convert the alternating magnetic field into a direct current for outputting to a load 02. The specific structure of the wireless charging transmitting device 100 refers to the above embodiments, and since the wireless charging system adopts all technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here.

Referring to fig. 6, in this embodiment, the wireless charging receiving apparatus 200 includes a secondary resonant circuit 50 and a secondary rectifying and filtering module 60, wherein the secondary resonant circuit 50 is electrically connected to the secondary rectifying and filtering module 60; the secondary resonant circuit 50 generates an induced current by inducing the alternating magnetic field generated by the primary resonant circuit 40, and outputs the induced current to the secondary rectifying and filtering module 60, and the secondary rectifying and filtering module 60 converts the induced current output by the secondary resonant circuit 50 into a direct current to be output, and supplies the direct current to the load 02 for use (for example, charging a battery of a device). The secondary resonant circuit 50 is configured to receive the alternating magnetic field energy generated by the primary resonant circuit 40 through the coil thereof, and convert the alternating magnetic field energy into alternating current, and the resonance effect of the secondary resonant circuit 50 greatly improves the receiving efficiency of the coil thereof, thereby improving the utilization efficiency of the electric energy of the wireless charging system.

Referring to fig. 7, the secondary resonant circuit 50 includes a secondary coil Lj, a second capacitor bank 51 and two second connection terminals J2 connected to the secondary rectifying and filtering module 60, the secondary coil Lj and the second capacitor bank 51 are connected in series between the two second connection terminals J2, and the second capacitor bank 51 includes one second resonant capacitor Cx2 or a plurality of second resonant capacitors Cx2 connected in parallel. The secondary resonant circuit 50 of the present embodiment is an LC topology structure formed by the second resonant capacitor Cx2 and the secondary coil Lj; of course, in other embodiments, the secondary resonant circuit 50 may also employ other resonant topologies.

Referring to fig. 8, in the present embodiment, the secondary side rectifying and filtering module 60 includes a secondary side control module 61, a full-bridge rectifying circuit 62 and a filtering circuit 63, and the secondary side resonant circuit 50 is connected to the filtering circuit 63 through the full-bridge rectifying circuit 62; the secondary side control module 61 is electrically connected with the full-bridge rectification circuit 62 and controls synchronous rectification of the full-bridge rectification circuit 62. In this embodiment, the wireless charging receiving apparatus 200 adopts a synchronous rectification scheme, so that the rectification efficiency of the wireless charging receiving apparatus 200 is greatly improved.

Referring to fig. 9, in the present embodiment, the full-bridge rectifier circuit 62 includes a first bridge arm and a second bridge arm connected in parallel between a first parallel connection point B1 and a second parallel connection point B2, the first bridge arm includes a first switch unit 621 and a second switch unit 622 connected in series, the second bridge arm includes a third switch unit 623 and a fourth switch unit 624 connected in series, a connection point between the first switch unit 621 and the second switch unit 622 is a first series connection point a1, a connection point between the third switch tube and the fourth switch tube is a second series connection point a2, the first series connection point a1 and the second series connection point a2 are connected to the secondary resonant circuit 50 (connected to two second connection points J2 of the secondary resonant circuit 50), and the first parallel connection point B1 and the second parallel connection point B2 are connected to the filter circuit 63; the secondary control module 61 is electrically connected to the first switch unit 621, the second switch unit 622, the third switch unit 623 and the fourth switch unit 624 respectively, and controls on/off of the first switch unit 621, the second switch unit 622, the third switch unit 623 and the fourth switch unit 624.

Referring to fig. 9, in the present embodiment, each switching unit has the same device structure, and each switching unit includes two MOS transistors connected in parallel. Of course, in other embodiments, only one MOS transistor or more parallel MOS transistors may be used for each switching unit.

In this embodiment, the filter circuit 63 employs three filter capacitors Cv connected in parallel.

In the above-described embodiment, each of the PWMs 5 to 8 is the driving signal output by the secondary control module 61.

The above description is only a part of or preferred embodiments of the present invention, and neither the text nor the drawings should be construed as limiting the scope of the present invention, and all equivalent structural changes, which are made by using the contents of the present specification and the drawings, or any other related technical fields, are included in the scope of the present invention.

Claims

1. A wireless charging and transmitting device is characterized by comprising a primary side control module, a primary side rectifying and filtering module, a high-frequency inversion module and a primary side resonant circuit which are sequentially connected;

2. The wireless charging and transmitting device of claim 1, wherein the primary side rectifying and filtering module comprises a filtering unit, a rectifying unit and a boosting unit which are connected in sequence, the filtering unit is provided with an alternating current input end used for being connected with a power frequency power supply, and the boosting unit is provided with a direct current output end connected with the high-frequency inverting module.

3. The wireless charging and transmitting device of claim 2, wherein the filtering unit employs an EMI filtering circuit.

4. The wireless charging and transmitting device of claim 2, wherein the boost unit employs a PFC circuit controlled by the primary side control module.

5. The wireless charging and transmitting device according to claim 4, wherein the boosting unit comprises a high-frequency filter capacitor, an energy storage inductor, a first switching tube, a protection diode, a boosting diode and an energy storage capacitor;

6. The wireless charging and transmitting device according to claim 4, wherein the voltage boosting unit further comprises an anti-shock protection unit, the anti-shock protection unit is connected in series with a voltage input end of the voltage boosting unit, and the primary side control module is electrically connected with the anti-shock protection unit and controls the anti-shock protection unit to switch between a load state and a short-circuit state.

7. The wireless charging and transmitting device according to claim 6, wherein the anti-shock protection unit comprises a relay switch and a current-limiting resistor, the relay switch is connected in series with the voltage input end of the voltage boosting unit, and the current-limiting resistor is connected in parallel with the relay switch; and the primary side control module is electrically connected with the relay switch and controls the on-off of the relay switch.

8. The wireless charging and transmitting device according to any one of claims 1 to 7, wherein the high-frequency inverter module employs a phase-shifted full-bridge inverter circuit controlled by the primary side control module to operate.

9. The wireless charging and transmitting device according to any one of claims 1 to 7, wherein the primary resonant circuit comprises a primary coil, a resonant inductor, a first capacitor bank, and two first connection terminals connected to the high-frequency inverter module, the resonant inductor and the primary coil are connected in series between the two first connection terminals, the first capacitor bank is connected in parallel with the primary coil, and the first capacitor bank comprises one first resonant capacitor or a plurality of first resonant capacitors connected in parallel.

10. The wireless charging and transmitting device according to any one of claims 1 to 7, wherein the primary side resonant circuit is an LC resonant circuit or an LCC resonant circuit.

11. A wireless charging system, comprising the wireless charging transmitting device according to any one of claims 1 to 10, and a wireless charging receiving device coupled with the wireless charging transmitting device.

12. The wireless charging system of claim 11, wherein the wireless charging receiving device comprises a secondary resonant circuit and a secondary rectifying and filtering module, and the secondary resonant circuit is electrically connected to the secondary rectifying and filtering module; the secondary resonant circuit generates induction current by inducing an alternating magnetic field generated by the primary resonant circuit and outputs the induction current to the secondary rectifying and filtering module, and the secondary rectifying and filtering module converts the induction current output by the secondary resonant circuit into direct current to output the direct current so as to charge a battery load.

13. The wireless charging system according to claim 12, wherein the secondary resonant circuit comprises a secondary coil, a second capacitor bank, and two second connection terminals connected to the secondary rectifying and filtering module, the secondary coil and the second capacitor bank are connected in series between the two second connection terminals, and the second capacitor bank comprises one second resonant capacitor or a plurality of second resonant capacitors connected in parallel.

14. The wireless charging system of claim 12, wherein the secondary side rectifying and filtering module comprises a secondary side control module, a full-bridge rectifying circuit and a filtering circuit, and the secondary side resonant circuit is connected with the filtering circuit through the full-bridge rectifying circuit; the secondary side control module is electrically connected with the full-bridge rectification circuit and controls synchronous rectification of the full-bridge rectification circuit.

15. The wireless charging system according to claim 14, wherein the full-bridge rectification circuit comprises a first bridge arm and a second bridge arm connected in parallel between a first parallel connection point and a second parallel connection point, the first bridge arm comprises a first switch unit and a second switch unit connected in series, the second bridge arm comprises a third switch unit and a fourth switch unit connected in series, a connection point between the first switch unit and the second switch unit is a first series connection point, a connection point between the third switch tube and a fourth switch tube is a second series connection point, the first series connection point and the second series connection point are connected to the secondary side resonance circuit, and the first parallel connection point and the second parallel connection point are connected to the filter circuit;