CN212627330U - Wireless charging system transmitting terminal, receiving terminal and system based on phase shift regulation control - Google Patents
Wireless charging system transmitting terminal, receiving terminal and system based on phase shift regulation control Download PDFInfo
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- CN212627330U CN212627330U CN202021162677.2U CN202021162677U CN212627330U CN 212627330 U CN212627330 U CN 212627330U CN 202021162677 U CN202021162677 U CN 202021162677U CN 212627330 U CN212627330 U CN 212627330U
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Abstract
The utility model provides a wireless charging system transmitting terminal, receiving terminal and system based on phase shift regulation control, transmitting terminal wireless connection charging system's a receiving terminal, the transmitting terminal includes: the rectification filter circuit is electrically connected with the power grid system; the inverter is electrically connected with the rectifying and filtering circuit; the transmitting coil is electrically connected with the inverter and is electromagnetically coupled with the receiving coil of the receiving end; the phase-shifting driving circuit is electrically connected with the inverter; the transmitting end MCU is electrically connected with the phase-shifting driving circuit; and the wireless communication receiving module is electrically connected with the transmitting end MCU and wirelessly connected with the receiving end. By adopting the scheme, the wireless charging system realizes high efficiency of wireless power transmission, and greatly reduces the volume and cost of the system.
Description
Technical Field
The utility model belongs to the technical field of wireless charging, especially, relate to a wireless charging system transmitting terminal, receiving terminal and system based on phase shift regulation and control.
Background
At present, with the continuous maturity of the technology, the mobile robot has been widely used in various industries to replace all the work of the original people. However, the charging problem of the current mobile robot device is always a key constraint affecting the performance of the mobile robot device, and the rapid charging of the mobile robot is a typical application of low voltage and large current. The traditional method adopts an electrode contact method, which has the defects of electric spark, electric leakage, electrode oxidation and the like, and is more serious especially in the case of quick charging. Therefore, it is an ideal choice to realize automatic charging of the robot by adopting a wireless charging technology. However, for the wireless power transmission system adopting the resonant mode, the overall efficiency of the system is affected by the impedance matching of the output, so that the wireless power transmission system cannot directly output low-voltage large current to the load. For this reason, some schemes implement impedance matching by adding a DC/DC circuit at the rear side of the wireless power transmission system. However, this approach increases the size of the system, reduces efficiency and increases system cost due to the addition of one stage of power conversion.
The existing wireless power transmission system generally adopts a mode of adjusting output gain by frequency, and the mode has the advantages of wider adjustment range and simple control method. However, the disadvantage is that the gain variation of the adjustment is relatively steep in the region close to the resonance point, and a small frequency variation causes a large fluctuation of the output current. Meanwhile, when the system is in a light load state, the working frequency of the system is far away from the resonance point, which results in the reduction of the working efficiency of the system. If the voltage regulation control mode is adopted, a stage of DC/DC is required to be added at the input side of the inverter to regulate and control the input voltage of the inverter, but the volume and the cost of the system are increased.
SUMMERY OF THE UTILITY MODEL
The utility model is directed to foretell technical problem, the utility model provides a novel wireless charging system transmitting terminal, transmitting terminal and system based on shift adjusting control can realize the efficient of system when, has also reduced the volume and the cost of system by a wide margin.
On the one hand, the utility model provides a wireless charging system transmitting terminal based on phase shift regulation control, wireless connection charging system's a receiving terminal, the transmitting terminal includes:
the rectification filter circuit is electrically connected with the power grid system;
the inverter is electrically connected with the rectifying and filtering circuit;
the transmitting coil is electrically connected with the inverter and is electromagnetically coupled with the receiving coil of the receiving end;
the phase-shifting driving circuit is electrically connected with the inverter;
the transmitting end MCU is electrically connected with the phase-shifting driving circuit and the wireless communication receiving module;
the wireless communication receiving module is electrically connected with the transmitting end MCU and wirelessly connected with the receiving end;
the alternating current accessed by the power grid system outputs direct current after passing through the rectifying and filtering circuit; after the transmitting end receives the charging instruction signal, a transmitting end MCU outputs four paths of control signals, the four paths of control signals are converted into four paths of inverter driving signals PWM2H, PWM2L, PWM3H and PWM3L through the phase-shifting driving circuit, the four switching tubes Q1, Q2, Q3 and Q4 of the inverter are respectively driven, and the inverter converts received direct current into high-frequency alternating current according to the driving signals to electrically excite the transmitting coil to generate an alternating electromagnetic field.
Furthermore, the transmitting terminal also comprises a transmitting terminal auxiliary power supply module, and the transmitting terminal auxiliary power supply module supplies power to the transmitting terminal MCU, the wireless communication receiving module and the phase-shift driving circuit.
Furthermore, the inverter is an H-bridge inverter formed by connecting a switching tube Q1, a switching tube Q2, a switching tube Q3 and a switching tube Q4 in parallel.
Furthermore, the transmitting terminal also comprises a voltage sampling circuit and a current sampling circuit, wherein the voltage sampling circuit and the current sampling circuit are both electrically connected with the output point of the inverter and the MCU of the transmitting terminal.
Further, the phase-shift driving circuit comprises logic units U1 and U2, a phase-shift driving unit and a pulse transformer T3, which are electrically connected, wherein the logic unit is electrically connected to the transmitting end MCU, and the pulse transformer is electrically connected to the inverter circuit.
Furthermore, the voltage sampling circuit comprises a voltage sampling unit, a leading phase compensation circuit and a waveform shaping circuit which are connected in series.
In a second aspect, the utility model discloses a based on shift wireless charging system receiving terminal of phase control, wireless connection as above based on shift wireless charging system transmitting terminal of phase control, the receiving terminal includes:
a receiving coil electromagnetically coupled to the transmitting coil of the transmitting terminal;
the high-frequency transformer is electrically connected with the receiving coil;
the rectifying circuit is electrically connected with the high-frequency transformer;
the filter circuit is electrically connected with the rectifying circuit;
the charging sampling circuit is electrically connected with the filter circuit;
the receiving end MCU is connected with the charging sampling circuit;
the wireless communication transmitting module is electrically connected with the receiving end MCU and wirelessly connected with the wireless communication receiving module of the transmitting end;
the receiving coil picks up energy from an alternating electromagnetic field generated by the transmitting coil by utilizing the magnetic field coupling effect, the energy is boosted or reduced by the high-frequency transformer and then converted into direct current by the rectifying circuit and the filtering circuit to be supplied to a load, and the load is a robot battery, but not limited to the robot battery, and can also be used for charging unmanned aerial vehicles, electric automobiles and the like; the charging sampling circuit samples and wirelessly feeds back the sampled data to the transmitting end through the receiving end MCU, and the transmitting end MCU controls the phase-shifting driving circuit to adjust the driving signal of the inverter.
Furthermore, the rectifying circuit adopts a full-wave rectifying circuit consisting of a diode D1 and a diode D2, the anodes of the diode D1 and the diode D2 are respectively connected with the two ends of the secondary side of the high-frequency transformer, and the cathodes of the diode D1 and the diode D2 are connected with the filter circuit.
Further, the rectifier circuit adopts a full-bridge rectifier circuit consisting of a diode D1, a diode D2, a diode D3 and a diode D4, and the diode D4 and the diode D1, and the diode D2 and the diode D3 are connected in series two by two and then connected in parallel to form a bridge structure.
Furthermore, the filter circuit adopts a pi-type filter circuit composed of a capacitor C1, an inductor L2 and a capacitor C2, wherein one end of the capacitor C1 and one end of the capacitor C2 are connected in parallel to two ends of the inductor L2, and the other ends of the capacitor C1 and the capacitor C2 are grounded.
Third aspect, the utility model discloses a based on move looks regulation and control wireless charging system, include: a transmitting end and a receiving end as described above.
Preferably, the transmitting end rectifying and filtering circuit may also include a power factor correction circuit (PFC circuit), and the power factor correction circuit is a functional circuit designed mainly to meet the requirements of power factors of electric networks of various countries for electric equipment, or to meet different power frequency ac bus voltages of electric networks of various countries.
Preferably, the transmitting coil and the receiving coil may also include a compensation network connected to the transmitting coil or the receiving coil and the compensating network. The compensation network is typically an LC network consisting of one or more capacitors or inductors to adjust the resonant frequency of the system. Commonly used compensation networks include: SS, SP, LCC-S, LCC-LCC, etc.
Compared with the prior art, the application has the advantages and positive effects that:
the wireless charging system adopts a separation structure, the transmitting end is in wireless communication connection with the receiving end and transmits electric energy through magnetic field coupling, non-contact charging is achieved, and safety and convenience are achieved;
the receiving terminal of the wireless charging system of this application sets up sampling circuit and feeds back sampling signal to transmitting terminal MCU by receiving terminal MCU, can directly realize treating the constant current or the constant voltage control of charging load by transmitting terminal MCU, guarantees wireless charging process's stability, and need not to set up the DC/DC circuit at the receiving terminal, simplifies circuit structure, reduces receiving terminal and load volume, practices thrift the cost greatly.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a second embodiment of the present invention;
fig. 3 is a schematic diagram of a voltage sampling circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an inverter according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a receiving end according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a receiving end according to another embodiment of the present invention;
fig. 7 is a schematic diagram of a receiving end according to another embodiment of the present invention;
fig. 8 is a schematic diagram of a receiving end according to another embodiment of the present invention;
wherein:
1. a transmitting end; 11. a rectification filter circuit; 12. an inverter; 13. a transmitting coil; 14. a phase shift drive circuit; 15. a transmitting end MCU; 16. the transmitting terminal auxiliary power supply module; 17. a wireless communication receiving module; 18. a voltage sampling circuit; 19. a current sampling circuit;
2. a receiving end; 21. a receiving coil; 22. a high-frequency transformer; 23. a rectifying circuit; 24. a filter circuit; 25. a charge sampling circuit; 26. receiving end MCU; 27. the receiving end is provided with an auxiliary power supply module; 28. and a wireless communication transmitting module.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
The first embodiment is as follows:
referring to fig. 1, a transmitting terminal 1 of a wireless charging system based on phase shift adjustment control, a receiving terminal 2 of the wireless charging system, and the wireless charging system including the transmitting terminal 1 and the receiving terminal 2 are shown.
The transmitting terminal 1 includes: rectifier filter circuit 11, inverter 12, transmitting coil 13 and electrically connected's wireless communication receiving module 17 and the control circuit that charges that the electrical property concatenates, wireless communication receiving module 17 and receiving terminal 2 wireless connection, the control circuit that charges includes: the transmitting end MCU15 and the phase-shift driving circuit 14 electrically connected with the transmitting end MCU15 and the inverter 12; the ac power input by the power grid is used to supply power to the transmitting end MCU15, the wireless communication receiving module 17 and the phase shift driving circuit 14 through a transmitting end auxiliary power supply module 16.
The receiving end 2 includes: the receiving coil 21 is electromagnetically coupled to the transmitting coil 13 of the transmitting terminal 1, the filter circuit 24 is further connected to the charging sampling circuit 25 and the receiving terminal auxiliary power supply module 27, the charging sampling circuit 25 and the receiving terminal auxiliary power supply module 27 are both electrically connected to the receiving terminal MCU26, the receiving terminal MCU26 is electrically connected to the wireless communication transmitting module 28, and the wireless communication transmitting module 28 is wirelessly connected to the wireless communication receiving module 17 of the transmitting terminal 1.
Fig. 4 is a schematic diagram of an inverter according to an embodiment of the present invention; as shown in fig. 4, the inverter 12 is an H-bridge inverter formed by connecting a switching tube Q1, a switching tube Q2, a switching tube Q3 and a switching tube Q4 in parallel, and the switching tubes of the present embodiment may be MOSFETs or IGBTs.
Fig. 5 is a schematic diagram of a receiving end according to an embodiment of the present invention; as shown in fig. 5, the receiving coil L1 forms a loop with the primary side of the high-frequency transformer 22, the rectifying circuit 23 adopts a full-wave rectifying circuit composed of a diode D1 and a diode D2, the anodes of the diode D1 and the diode D2 are respectively connected to the two ends of the secondary side of the high-frequency transformer 22, the cathode is connected to the filter circuit 24, the high-frequency transformer 22 adopts a winding with a center tap, the center tap of the high-frequency transformer 22 is connected to the capacitor C1, the transformer turns ratio is N: M, wherein N: M is the voltage transformation ratio of the primary side and the secondary side, the primary impedance of the high-frequency transformer 22 is matched with the impedance of the transmitting terminal 1, and the secondary impedance is matched with the impedance of the load, so as to solve the influence of the impedance transformation. At the moment, the withstand voltage on the rectifier diode is 2 times of the output voltage; the filter circuit 24 is a pi-type filter circuit composed of a capacitor C1, an inductor L2 and a capacitor C2, wherein one end of the capacitor C1 and one end of the capacitor C2 are connected in parallel to two ends of the inductor L2, and the other end of the capacitor C1 is grounded.
When the wireless charging system of this embodiment works, the ac accessed by the power grid system supplies power to the transmitting end MCU15, the phase shift driving circuit 14, and the wireless communication receiving module 17 through the transmitting end auxiliary power supply module 16; after receiving a charging instruction of a system, the transmitting end MCU15 outputs PWM1, PWM2, PWM3 and PWM4, respectively outputs four inverter driving signals PWM2H, PWM2L, PWM3H and PWM3L through the phase shift driving circuit 14, respectively drives four switching tubes Q1, Q2, Q3 and Q4 of the inverter 12, and the inverter 12 converts the input direct current into high-frequency alternating current according to the inverter driving signals to excite the transmitting coil 13 to generate an alternating electromagnetic field.
Correspondingly, the receiving coil 21 of the receiving end 2 picks up energy from the alternating electromagnetic field generated by the transmitting coil 13 through the magnetic field coupling effect, the high-frequency transformer 22 boosts or reduces the voltage of the received high-frequency alternating current, and then the high-frequency alternating current is rectified and filtered by the rectifying circuit 23 and the filtering circuit 24 and then converted into direct current to be output to a load, wherein the load can be a robot battery and the like, but not limited to the robot battery, and can also be used for charging batteries of unmanned aerial vehicles, electric vehicles and the like.
First, because the wireless charging system of this embodiment adopts the isolating construction, transmitting terminal 1 and receiving terminal 2 wireless communication are connected and pass the electric energy through magnetic field coupling, realize the non-contact charging, safe convenient again.
Secondly, the receiving end 2 of the wireless charging system of the embodiment is provided with the sampling circuit, the receiving end MCU26 feeds back a sampling signal to the transmitting end MCU15, and the transmitting end MCU15 can directly realize constant current or constant voltage control on a load to be charged, so as to ensure the stability of the wireless charging process, and a DC/DC circuit is not required to be provided at the receiving end, thereby simplifying the circuit structure, reducing the volume of the receiving end and the load to be charged, and greatly saving the cost;
thirdly, the high-frequency transformer 22 is arranged behind the resonant network of the receiving end in the embodiment, the primary impedance of the high-frequency transformer 22 is matched with the impedance of the transmitting end 1, and the secondary impedance is matched with the impedance of the load to be charged, so that the influence of impedance transformation at two ends of electric energy transmission on the transmission efficiency is solved. By using the voltage transformation principle of the transformer, the impedance matching of the system is realized, a primary voltage reduction circuit is removed, the topology is simpler, and the efficiency is higher.
The second embodiment is as follows:
fig. 6 is a schematic diagram of a receiving end according to another embodiment of the present invention. Only the differences from the first embodiment will be described below, and the same parts are not repeated, referring to fig. 6, the differences from the first embodiment are:
the rectifier circuit 23 adopts a full-bridge rectifier circuit consisting of a diode D1, a diode D2, a diode D3 and a diode D4, wherein the diode D4 and the diode D1, and the diode D2 and the diode D3 are connected in series two by two and then connected in parallel to form a bridge structure. Correspondingly, the high frequency transformer 22 uses a winding without a center tap, and the transformer turns ratio is N: M, where N: M is the voltage transformation ratio of the primary side to the secondary side. The method needs four rectifying diodes, the number of used devices is large, but the voltage withstanding value required by the devices is low, and therefore cost is further reduced.
The third concrete embodiment:
as shown in fig. 7 and 8, the present embodiment is different from the first and second embodiments in that:
the receiving end 2 adopts an LCC parallel resonance topology, and the resonance circuit is formed by connecting two ends of a receiving coil L1 in parallel with resonance capacitors C3 and C11 and then connecting a resonance inductor L4 in series.
The fourth concrete embodiment:
referring to fig. 2, a wireless charging system according to another embodiment of the present invention is shown, and the difference between the embodiment and the above embodiment is:
the transmitting terminal 1 is provided with a voltage sampling circuit 18 and a current sampling circuit 19, the voltage sampling circuit 18 and the current sampling circuit 19 are both electrically connected with an output point of the inverter 12 and an MCU15 of the transmitting terminal, wherein as shown in FIG. 3, the voltage sampling circuit comprises a voltage sampling unit, an advance phase compensation circuit and a waveform shaping circuit which are connected in series, the advance phase compensation circuit consists of a capacitor C6, a resistor R3, a resistor R4 and a resistor R5, and the front ends of the advance phase compensation circuit are connected with voltage dividing resistors R8 and R2 in parallel; the voltage signal of the output point of the inverter 12 is reduced by the voltage sampling unit, then is compensated by the lead phase compensation network for phase delay caused by hardware sampling, is subjected to waveform shaping by the two-stage comparator, and then is sent to the transmitting end MCU15 for signal adjustment, so that the output impedance of the output point of the inverter is in a resistance characteristic, and the problems of system efficiency reduction and EMI caused by the difference between a resonant capacitor and a coil or the load of the receiving end in application are avoided.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art may use the above-mentioned technical contents to change or modify the equivalent embodiment into equivalent changes and apply to other fields, but any simple modification, equivalent change and modification made to the above embodiments according to the technical matters of the present invention will still fall within the protection scope of the technical solution of the present invention.
Claims (9)
1. Based on shift phase adjustment control's wireless charging system transmitting terminal, wireless connection a receiving terminal of charging system, its characterized in that, the transmitting terminal includes:
the rectification filter circuit is electrically connected with the power grid system;
the inverter is electrically connected with the rectifying and filtering circuit;
the transmitting coil is electrically connected with the inverter and is electromagnetically coupled with the receiving coil of the receiving end;
the phase-shifting driving circuit is electrically connected with the inverter;
the transmitting end MCU is electrically connected with the phase-shifting driving circuit and the wireless communication receiving module;
and the wireless communication receiving module is electrically connected with the transmitting end MCU and wirelessly connected with the receiving end.
2. The phase-shifting regulation control-based wireless charging system transmitting terminal according to claim 1, further comprising a voltage sampling circuit and a current sampling circuit, wherein the voltage sampling circuit and the current sampling circuit are both electrically connected to the inverter output point and the transmitting terminal MCU.
3. The phase-shift regulation control-based wireless charging system transmitting terminal according to claim 2, wherein the inverter is an H-bridge inverter formed by connecting a switching tube Q1, a switching tube Q2, a switching tube Q3 and a switching tube Q4 in parallel.
4. The phase shift adjustment control-based wireless charging system transmitting terminal according to claim 3, wherein the voltage sampling circuit comprises a voltage sampling unit, a leading phase compensation circuit and a waveform shaping circuit which are connected in series.
5. The phase shift regulation control-based wireless charging system receiving terminal wirelessly connected with the phase shift regulation control-based wireless charging system transmitting terminal of any one of claims 1 to 4, wherein the receiving terminal comprises:
a receiving coil electromagnetically coupled to the transmitting coil of the transmitting terminal;
the high-frequency transformer is electrically connected with the receiving coil;
the rectifying circuit is electrically connected with the high-frequency transformer;
the filter circuit is electrically connected with the rectifying circuit;
the charging sampling circuit is electrically connected with the filter circuit;
the receiving end MCU is connected with the charging sampling circuit;
and the wireless communication transmitting module is electrically connected with the receiving end MCU and wirelessly connected with the wireless communication receiving module of the transmitting end.
6. The receiving end of a wireless charging system based on phase shift regulation control according to claim 5, wherein the rectifying circuit adopts a full-wave rectifying circuit consisting of a diode D1 and a diode D2, the anodes of the diode D1 and the diode D2 are respectively connected to two ends of the secondary side of the high-frequency transformer, and the cathodes of the diode D1 and the diode D2 are connected to the filter circuit.
7. The phase shift regulation control-based wireless charging system receiving end according to claim 6, wherein the rectifying circuit adopts a full-bridge rectifying circuit consisting of a diode D1, a diode D2, a diode D3 and a diode D4, and the diodes D4 and D1, and the diodes D2 and D3 are connected in series two by two and then connected in parallel to form a "bridge" structure.
8. The receiving end of a wireless charging system based on phase shift regulation control according to claim 6 or 7, wherein the filter circuit is a pi-type filter circuit consisting of a capacitor C1, an inductor L2 and a capacitor C2, wherein one end of the capacitor C1 and one end of the capacitor C2 are connected in parallel to two ends of the inductor L2, and the other ends of the capacitor C1 and the capacitor C2 are grounded.
9. Wireless charging system based on adjust control phase shift, its characterized in that includes: the phase shift adjustment control-based wireless charging system transmitting terminal of any one of claims 1 to 4 and the phase shift adjustment control-based wireless charging system receiving terminal of any one of claims 5 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021162677.2U CN212627330U (en) | 2020-06-19 | 2020-06-19 | Wireless charging system transmitting terminal, receiving terminal and system based on phase shift regulation control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021162677.2U CN212627330U (en) | 2020-06-19 | 2020-06-19 | Wireless charging system transmitting terminal, receiving terminal and system based on phase shift regulation control |
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| CN212627330U true CN212627330U (en) | 2021-02-26 |
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| CN202021162677.2U Active CN212627330U (en) | 2020-06-19 | 2020-06-19 | Wireless charging system transmitting terminal, receiving terminal and system based on phase shift regulation control |
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