CN113162136B - Wireless charging system and method - Google Patents

Wireless charging system and method Download PDF

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Publication number
CN113162136B
CN113162136B CN202110240634.4A CN202110240634A CN113162136B CN 113162136 B CN113162136 B CN 113162136B CN 202110240634 A CN202110240634 A CN 202110240634A CN 113162136 B CN113162136 B CN 113162136B
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transmitting
module
switch
receiving
constant current
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CN113162136A (en
Inventor
陈绍南
俞小勇
奉斌
陈千懿
高立克
秦丽文
吴丽芳
李克文
欧世锋
欧阳健娜
黄伟翔
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Electric Power Research Institute of Guangxi Power Grid Co Ltd
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Electric Power Research Institute of Guangxi Power Grid Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
    • B60L53/12—Inductive energy transfer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/50—Circuit arrangements or systems for wireless supply or distribution of electric power using additional energy repeaters between transmitting devices and receiving devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a wireless charging system and a method, comprising a transmitting device and a receiving device; the transmitting device comprises a transmitting power supply module, a transmitting inverter, a first constant current transmitting module, a second constant current transmitting module and a constant voltage conversion module; the first constant current transmitting module is connected to the output end of the transmitting inverter based on the first switch, the second constant current transmitting module is connected to the output end of the transmitting inverter based on the second switch, the input end of the constant voltage conversion module is arranged corresponding to the output end of the second constant current transmitting module, and the constant voltage conversion module is used for converting the constant current output of the second constant current transmitting module into constant voltage output; the first switch and the second switch are not in a passage state at the same time; the receiving device comprises a constant current receiving module, a constant voltage receiving module, a rectifier filter and a receiving power supply module; by transferring the structure related to constant voltage and constant current charging to the transmitting device side, the number and weight of parts on the receiving device side are reduced, and the requirement for light weight of the receiving device is met.

Description

Wireless charging system and method
Technical Field
The invention belongs to the technical field of wireless charging of unmanned aerial vehicles, and particularly relates to a wireless charging system and method.
Background
Unmanned aerial vehicle is wireless to be charged and involves the side equipment that charges and receive side equipment, and is general, and the side equipment that charges breaks away from the external equipment that unmanned aerial vehicle exists, and receive side equipment is the equipment of setting on unmanned aerial vehicle. In order to take account of the charging speed and the service life of the battery of the unmanned aerial vehicle, when the battery is charged, the best charging mode is to perform constant-current charging first and then perform constant-voltage charging.
In the prior art, although the charging method based on the secondary side DC/DC circuit can realize a required charging mode, the size and the weight of receiving side equipment are increased, and the lightweight of the unmanned aerial vehicle is not facilitated; the switching of the charging mode can be realized by the primary side phase shift control mode, but the requirement on communication is extremely high, and the primary side current is easy to distort, so that the charging efficiency of the battery is reduced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a wireless charging system and a wireless charging method, which are characterized in that related structures related to constant-current charging and constant-voltage charging are transferred to one side of a transmitting device, only a necessary charging structure is reserved on one side of a receiving device, and the number and the weight of parts on one side of the receiving device are reduced on the premise of meeting the switching requirement of the constant-current charging and the constant-voltage charging so as to meet the light-weight requirement of the receiving device.
Correspondingly, the invention provides a wireless charging system, which comprises a transmitting device and a receiving device;
the transmitting device comprises a transmitting power supply module, a transmitting inverter, a first constant current transmitting module, a second constant current transmitting module and a constant voltage conversion module; the input end of the transmitting inverter is connected with the transmitting power supply, the input end of the first constant current transmitting module is connected to the output end of the transmitting inverter based on a first switch, the input end of the second constant current transmitting module is connected to the output end of the transmitting inverter based on a second switch, the input end of the constant voltage conversion module and the output end of the second constant current transmitting module are correspondingly arranged, and the constant voltage conversion module is used for converting the constant current output of the second constant current transmitting module into constant voltage output;
the first switch and the second switch are not in a passage state at the same time;
the receiving device comprises a constant current receiving module, a constant voltage receiving module, a rectifier filter and a receiving power supply module, wherein the receiving power supply module is connected with the output end of the rectifier filter, and the output end of the constant current receiving module and the output end of the constant voltage receiving module are respectively connected with the input end of the rectifier filter.
In an optional embodiment, the transmitting inverter includes a switching tube Q1, a switching tube Q2, a switching tube Q3 and a switching tube Q4;
the anode of the transmitting power supply module, the switch tube Q1, the switch tube Q3 and the cathode of the transmitting power supply module are sequentially connected to form a loop, and a first transmitting end is led out between the switch tube Q1 and the switch tube Q3;
the positive pole of transmission power module, switch tube Q2, switch tube Q4, the negative pole of transmission power module connects gradually and forms the return circuit, draw forth the second transmitting terminal between switch tube Q2 and the switch tube Q4.
In an optional embodiment, the first constant current transmission module comprises a capacitor Cp1 and a transmission coil Lp1;
the first transmitting end, the first switch, the capacitor Cp1, the transmitting coil Lp1 and the second transmitting end are sequentially connected.
In an optional embodiment, the second constant current transmission module comprises a capacitor Cp2 and a transmission coil Lp2;
the first transmitting end, the second switch, the capacitor Cp2, the transmitting coil Lp2 and the second transmitting end are connected in sequence.
In an alternative embodiment, the constant voltage conversion module comprises a conversion coil Lp3 and a capacitor Cp3;
two ends of the conversion coil Lp3 are respectively connected with two ends of the capacitor Cp3 to form a loop;
the conversion coil Lp3 is arranged corresponding to the transmitting coil Lp2 of the second constant current transmitting module.
In an optional embodiment, the rectifier filter includes a diode D1, a diode D2, a diode D3, a diode D4, and a capacitor CL;
the negative electrode of the receiving power supply module, the diode D3, the diode D1 and the positive electrode of the receiving power supply module are sequentially connected to form a loop;
the negative electrode of the receiving power supply module, the diode D4, the diode D2 and the positive electrode of the receiving power supply module are sequentially connected to form a loop;
two ends of the capacitor CL are respectively connected with the anode and the cathode of the receiving power supply module;
a first input end is led out between the diode D3 and the diode D1, and a second input end is led out between the diode D4 and the diode D2.
In an optional embodiment, the constant current receiving module includes a receiving coil Ls1 and a capacitor Cs1;
the first input end, the receiving coil Ls1, the capacitor Cs1 and the second input end are connected in sequence.
In an optional embodiment, the constant voltage receiving module includes a receiving coil Ls2 and a capacitor Cs2;
the first input end, the receiving coil Ls2, the capacitor Cs2 and the second input end are connected in sequence.
Correspondingly, the invention also provides a wireless charging method, which is realized based on any one of the wireless charging systems and comprises the following steps:
the first switch and the second switch are kept in an open-circuit state in a standby state;
closing the first switch S1 according to the charging request;
taking the voltage at two ends of the receiving power supply module as a charging voltage;
detecting the charging voltage, and judging whether the charging voltage U0 is smaller than a voltage threshold value U1;
and when the charging voltage U0 is not less than the voltage threshold value U1, opening the first switch and closing the second switch.
An optional embodiment, further comprising the steps of:
detecting the charging voltage, and judging whether the charging voltage U0 is smaller than a voltage threshold U2, wherein the voltage threshold U2 is larger than the voltage threshold U1;
and when the charging voltage U0 is not less than the voltage threshold U2, the second switch is switched off.
In summary, according to the wireless charging system and the wireless charging method provided by the invention, two sets of coupling mechanisms are arranged in the same wireless charging system, one set of coupling mechanism realizes constant-current charging, the other set of coupling mechanism realizes constant-voltage charging, and the working states of the two sets of coupling mechanisms are switched according to the magnitude of charging voltage, so that the charging requirements of constant current and constant voltage of the battery are met, a traditional constant-current and constant-voltage control algorithm is not needed, and the control complexity is reduced. In the embodiment, the three coils form an S-S-S topological structure to realize the constant voltage output effect, and the coupling between the transmitting coil and the receiving coil is enhanced. This embodiment has reduced vice limit volume and quality through set up change over switch at the primary for unmanned aerial vehicle vice limit realizes the lightweight.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is a schematic structural diagram of a wireless charging system in this embodiment;
fig. 2 is a flowchart of a wireless charging method in the present embodiment.
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 some, not all, embodiments of the present invention. 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.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
The invention provides a wireless charging system, which comprises a transmitting device and a receiving device, wherein the transmitting device comprises a transmitting terminal and a receiving terminal; specifically, emitter specifically is the external receiving arrangement who arranges unmanned aerial vehicle in, and receiving arrangement sets up unmanned on.
The transmitting device comprises a transmitting power supply module, a transmitting inverter, a first constant current transmitting module, a second constant current transmitting module and a constant voltage conversion module; the input end of the transmitting inverter is connected with the transmitting power supply, the input end of the first constant current transmitting module is connected to the output end of the transmitting inverter based on a first switch, the input end of the second constant current transmitting module is connected to the output end of the transmitting inverter based on a second switch, the input end of the constant voltage conversion module is arranged corresponding to the output end of the second constant current transmitting module, and the constant voltage conversion module is used for converting the constant current output of the second constant current transmitting module into constant voltage output.
Specifically, the transmitting inverter is used for generating high-frequency power meeting voltage requirements so as to transmit the high-frequency power by the transmitting coils of the first constant-current transmitting module and the second constant-current transmitting module, and after the transmitting coil of the second constant-current transmitting module transmits the high-frequency power, the constant-voltage converting module converts the constant-current output into the constant-voltage output and transmits the constant-voltage output to the outside.
The first switch and the second switch are not in a passage state at the same time, specifically, the first switch and the second switch respectively control the on-off state between the first constant current transmitting module, the second constant current transmitting module and the transmitting inverter, and only one transmitting module of the first constant current transmitting module and the second constant current transmitting module should work at the same time in order to ensure the safety of the receiving device.
Specifically, the receiving device comprises a constant current receiving module, a constant voltage receiving module, a rectifier filter and a receiving power supply module, wherein the receiving power supply module is connected with the output end of the rectifier filter, and the output end of the constant current receiving module and the output end of the constant voltage receiving module are respectively connected with the input end of the rectifier filter. The receiving device is of a structure installed on the unmanned aerial vehicle, when the unmanned aerial vehicle needs to be charged, the constant current receiving module is opposite to the first constant current transmitting module in position, and the constant voltage receiving module is opposite to the second constant current transmitting module in position, so that the requirement of the objective position of wireless charging is met; due to the single operability of the first constant current transmitting module and the second constant current transmitting module, correspondingly, the constant current receiving module and the first constant current transmitting module on one side of the receiving device do not need to be additionally provided with control elements so as to prevent the constant current receiving module and the first constant current transmitting module from working simultaneously, and the receiving power supply module can realize charging action under the respective actions of the constant current receiving module and the first constant current transmitting module.
Specifically, through foretell wireless charging system, the control structure that constant current charges and constant voltage charge sets up in emitter one side, and receiving arrangement is provided with two corresponding receiving modules and can satisfies variable charging demand, can reduce the circuit complexity, equipment quantity and the weight of receiving arrangement one side, satisfies receiving arrangement's lightweight requirement.
Furthermore, the legs of the general unmanned aerial vehicle are supported on the ground when the unmanned aerial vehicle lands, in order to ensure the wireless charging quality, the receiving modules are generally arranged on one side of the legs, and the two receiving modules of the embodiment of the invention can be respectively arranged on the two legs, so that the balance weight balance of the unmanned aerial vehicle can be ensured.
Specifically, the transmitting inverter comprises a switching tube Q1, a switching tube Q2, a switching tube Q3 and a switching tube Q4.
The anode of the transmitting power supply module, the switch tube Q1, the switch tube Q3 and the cathode of the transmitting power supply module are sequentially connected to form a loop, and a first transmitting end is led out between the switch tube Q1 and the switch tube Q3; the positive pole of transmission power module, switch tube Q2, switch tube Q4, the negative pole of transmission power module connects gradually and forms the return circuit, draw forth the second transmitting terminal between switch tube Q2 and the switch tube Q4.
Specifically, the transmitting power supply module V1 forms high-frequency alternating current through the transmitting inverter to supply power to the transmitting coil, the primary side transmits energy to the secondary side through a magnetic field coupling mode, and the receiving power supply module of the unmanned aerial vehicle supplies power through the rectifier filter.
In an optional embodiment, the first constant current transmission module comprises a capacitor Cp1 and a transmission coil Lp1;
the first transmitting end, the first switch, the capacitor Cp1, the transmitting coil Lp1 and the second transmitting end are sequentially connected.
In an optional embodiment, the second constant current transmission module comprises a capacitor Cp2 and a transmission coil Lp2;
the first transmitting end, the second switch, the capacitor Cp2, the transmitting coil Lp2 and the second transmitting end are sequentially connected.
In an alternative embodiment, the constant voltage conversion module comprises a conversion coil Lp3 and a capacitor Cp3; two ends of the conversion coil Lp3 are respectively connected with two ends of the capacitor Cp3 to form a loop; the conversion coil Lp3 is arranged corresponding to the transmitting coil Lp2 of the second constant current transmitting module.
In an optional embodiment, the rectifier filter includes a diode D1, a diode D2, a diode D3, a diode D4, and a capacitor CL; the negative electrode of the receiving power supply module, the diode D3, the diode D1 and the positive electrode of the receiving power supply module are sequentially connected to form a loop; the negative electrode of the receiving power supply module, the diode D4, the diode D2 and the positive electrode of the receiving power supply module are sequentially connected to form a loop; two ends of the capacitor CL are respectively connected with the anode and the cathode of the receiving power supply module; a first input end is led out between the diode D3 and the diode D1, and a second input end is led out between the diode D4 and the diode D2.
In an optional embodiment, the constant current receiving module includes a receiving coil Ls1 and a capacitor Cs1; the first input end, the receiving coil Ls1, the capacitor Cs1 and the second input end are connected in sequence. In an optional embodiment, the constant voltage receiving module includes a receiving coil Ls2 and a capacitor Cs2; the first input end, the receiving coil Ls2, the capacitor Cs2 and the second input end are connected in sequence.
In summary of the above description, when constant-current charging is required, the first switch S1 is turned on, the topology of the system coupling mechanism is SS type, the transmitting coil Lp1 wirelessly transmits energy to the receiving coil Ls1, and according to theoretical analysis, the topology output current formula is as follows:
Figure GDA0003856003720000081
because the internal resistances Rp1 and Rs1 of the coil are small, rp1 (Rs 1+ RL) can be ignored, and the topology is considered to have constant current output capability.
When the charging voltage reaches a set voltage threshold value and constant-voltage charging is needed, the second switch S2 is conducted to close the first switch S1, the topology of the system coupling mechanism is S-S-S type, the transmitting coil Lp2 wirelessly transmits energy to the receiving coil Ls2 through the relay coil Lp3, and according to theoretical analysis, the topology output voltage formula is as follows.
Figure GDA0003856003720000091
The S-S-S topology can be considered to have constant voltage output capability because the internal resistances Rp2, rp3 and Rs2 of the coils are small.
Correspondingly, the invention provides a wireless charging method, which is realized based on any one of the wireless charging systems, and comprises the following steps:
s101, keeping a first switch and a second switch in an open state in a standby state;
s102, closing a first switch S1 according to the charging request;
s103, taking the voltage at two ends of the power receiving module as a charging voltage, detecting the charging voltage, and judging whether the charging voltage U0 is smaller than a voltage threshold value U1;
and S104, when the charging voltage U0 is not less than the voltage threshold value U1, opening the first switch and closing the second switch.
An optional embodiment, further comprising the steps of:
s105, detecting the charging voltage, and judging whether the charging voltage U0 is smaller than a voltage threshold U2, wherein the voltage threshold U2 is larger than the voltage threshold U1;
s106: and when the charging voltage U0 is not less than the voltage threshold U2, the second switch is switched off.
In summary, according to the technical scheme of this embodiment, two sets of coupling mechanisms are arranged in the same wireless charging system, one set of coupling mechanism realizes constant-current charging, the other set of coupling mechanism realizes constant-voltage charging, and the working states of the two sets of coupling mechanisms are switched according to the magnitude of the charging voltage, so that the charging requirements of constant current and constant voltage of the battery are met, a traditional constant-current and constant-voltage control algorithm is not needed, and the control complexity is reduced. In the embodiment, the three coils form an S-S-S topological structure to realize the constant voltage output effect, and the coupling between the transmitting coil and the receiving coil is enhanced. This embodiment has reduced vice limit volume and quality through set up change over switch at the primary for unmanned aerial vehicle vice limit realizes the lightweight.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.

Claims (10)

1. A wireless charging system is characterized by comprising a transmitting device and a receiving device;
the transmitting device comprises a transmitting power supply module, a transmitting inverter, a first constant current transmitting module, a second constant current transmitting module and a constant voltage conversion module; the input end of the transmitting inverter is connected with the transmitting power supply, the input end of the first constant current transmitting module is connected to the output end of the transmitting inverter based on a first switch, the input end of the second constant current transmitting module is connected to the output end of the transmitting inverter based on a second switch, the input end of the constant voltage converting module is arranged corresponding to the output end of the second constant current transmitting module, and the constant voltage converting module is used for converting the constant current output of the second constant current transmitting module into constant voltage output;
the first switch and the second switch are not in a passage state at the same time;
the receiving device comprises a constant current receiving module, a constant voltage receiving module, a rectifier filter and a receiving power supply module, wherein the receiving power supply module is connected with the output end of the rectifier filter, and the output end of the constant current receiving module and the output end of the constant voltage receiving module are respectively connected with the input end of the rectifier filter.
2. The wireless charging system of claim 1, wherein the transmitting inverter comprises a switching tube Q1, a switching tube Q2, a switching tube Q3 and a switching tube Q4;
the anode of the transmitting power supply module, the switch tube Q1, the switch tube Q3 and the cathode of the transmitting power supply module are sequentially connected to form a loop, and a first transmitting end is led out between the switch tube Q1 and the switch tube Q3;
the positive pole of transmission power module, switch tube Q2, switch tube Q4, the negative pole of transmission power module connects gradually and forms the return circuit, draw forth the second transmitting terminal between switch tube Q2 and the switch tube Q4.
3. The wireless charging system of claim 2, wherein the first constant current transmission module comprises a capacitor Cp1 and a transmission coil Lp1;
the first transmitting end, the first switch, the capacitor Cp1, the transmitting coil Lp1 and the second transmitting end are sequentially connected.
4. The wireless charging system according to claim 3, wherein the second constant current transmission module includes a capacitor Cp2 and a transmission coil Lp2;
the first transmitting end, the second switch, the capacitor Cp2, the transmitting coil Lp2 and the second transmitting end are sequentially connected.
5. The wireless charging system according to claim 4, wherein the constant voltage conversion module includes a conversion coil Lp3 and a capacitor Cp3;
two ends of the conversion coil Lp3 are respectively connected with two ends of the capacitor Cp3 to form a loop;
the conversion coil Lp3 is arranged corresponding to the transmitting coil Lp2 of the second constant current transmitting module.
6. The wireless charging system according to claim 1, wherein the rectifier filter includes a diode D1, a diode D2, a diode D3, a diode D4, and a capacitor CL;
the negative electrode of the receiving power supply module, the diode D3, the diode D1 and the positive electrode of the receiving power supply module are sequentially connected to form a loop;
the negative electrode of the receiving power supply module, the diode D4, the diode D2 and the positive electrode of the receiving power supply module are sequentially connected to form a loop;
two ends of the capacitor CL are respectively connected with the anode and the cathode of the receiving power supply module;
a first input end is led out between the diode D3 and the diode D1, and a second input end is led out between the diode D4 and the diode D2.
7. The wireless charging system of claim 6, wherein the constant current receiving module comprises a receiving coil Ls1 and a capacitor Cs1;
the first input end, the receiving coil Ls1, the capacitor Cs1 and the second input end are connected in sequence.
8. The wireless charging system of claim 6, wherein the constant voltage receiving module comprises a receiving coil Ls2 and a capacitor Cs2;
the first input end, the receiving coil Ls2, the capacitor Cs2 and the second input end are connected in sequence.
9. A wireless charging method implemented by the wireless charging system according to any one of claims 1 to 8, comprising the steps of:
the first switch and the second switch are kept in an open-circuit state in a standby state;
closing the first switch S1 according to the charging request;
taking the voltage at two ends of the receiving power supply module as a charging voltage;
detecting the charging voltage, and judging whether the charging voltage U0 is smaller than a voltage threshold value U1;
and when the charging voltage U0 is not less than the voltage threshold value U1, opening the first switch and closing the second switch.
10. The wireless charging method according to claim 9, further comprising the steps of:
detecting the charging voltage, and judging whether the charging voltage U0 is smaller than a voltage threshold U2, wherein the voltage threshold U2 is larger than the voltage threshold U1;
and when the charging voltage U0 is not less than the voltage threshold U2, the second switch is switched off.
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