CN113629799A - Wireless charging system and method for switching constant-current constant-voltage charging mode - Google Patents

Wireless charging system and method for switching constant-current constant-voltage charging mode Download PDF

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Publication number
CN113629799A
CN113629799A CN202110789343.0A CN202110789343A CN113629799A CN 113629799 A CN113629799 A CN 113629799A CN 202110789343 A CN202110789343 A CN 202110789343A CN 113629799 A CN113629799 A CN 113629799A
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China
Prior art keywords
constant
compensation
coil
circuit
switch
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Pending
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CN202110789343.0A
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Chinese (zh)
Inventor
龚文兰
尹立群
肖静
吴晓锐
吴宁
陈绍南
韩帅
陈卫东
郭敏
郭小璇
姚知洋
阮诗雅
赵立夏
孙乐平
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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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Priority to CN202110789343.0A priority Critical patent/CN113629799A/en
Publication of CN113629799A publication Critical patent/CN113629799A/en
Pending legal-status Critical Current

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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
    • 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
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00304—Overcurrent protection
    • 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

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

Abstract

The invention provides a wireless charging system and a wireless charging method for switching constant-current and constant-voltage charging modes, wherein the system comprises a transmitting end circuit and a receiving end circuit; the transmitting end circuit comprises a direct-current power supply, a full-bridge inverter circuit, a primary LCC type compensation circuit and an energy transmitting coil which are connected in sequence; the receiving end circuit comprises an energy receiving coil, a secondary LCC type compensation circuit, a secondary S type compensation circuit and a rectification filter circuit which are sequentially connected, wherein the switching on and off of the secondary LCC type compensation circuit and the secondary S type compensation circuit are controlled by a selector switch assembly; the energy transmitting coil and the energy receiving coil are coupled with each other; in the initial charging stage, the secondary LCC type compensation circuit is switched on, the secondary S type compensation circuit is switched off, and the load is charged with constant current; when the charging voltage reaches a preset voltage threshold, the secondary side S-type compensation circuit is switched on, and the secondary side LCC-type compensation circuit is switched off, so that the load is charged at a constant voltage. The constant-current and constant-voltage two-stage charging of the invention not only improves the charging efficiency, but also improves the performance and the service life of the battery, and saves the cost.

Description

Wireless charging system and method for switching constant-current constant-voltage charging mode
Technical Field
The invention relates to the technical field of wireless power transmission, in particular to a wireless charging system and method for switching constant-current and constant-voltage charging modes.
Background
Traditional wired charging has the shortcoming that it is inconvenient, need the manual operation to carry out electrical connection etc. of charging, along with the continuous development of wireless power transmission, has overcome wired charging's shortcoming, and wireless charging technique has advantages such as nimble, reliable, safety, and the charging process need not artificial intervention, and is more and more extensive in fields such as robot, household electrical appliances and electric automobile.
However, in general, wireless charging employs a single compensation network, which only has the capability of constant current or constant voltage output, if charging is performed in a constant current mode, the battery gassing phenomenon caused by excessive current at the later stage of charging may occur, and if charging is performed in a constant voltage mode, the problems of excessive current at the initial stage of charging, long charging time and the like may occur, so that wireless charging using the single compensation network has certain limitations. Therefore, there is a need for improvements in the prior art.
Disclosure of Invention
The invention aims to provide a wireless charging system and a wireless charging method for switching constant-current and constant-voltage charging modes, which can solve the problems caused by a single charging mode in the prior art.
The purpose of the invention is realized by the following technical scheme:
in a first aspect, the present invention provides a wireless charging system with constant-current and constant-voltage charging mode switching, including a transmitting-end circuit and a receiving-end circuit; the transmitting end circuit comprises a direct-current power supply, a full-bridge inverter circuit, a primary LCC type compensation circuit and an energy transmitting coil which are connected in sequence;
the receiving end circuit comprises an energy receiving coil, a secondary LCC type compensation circuit and a secondary S type compensation circuit which are controlled to be switched on and switched off by a change-over switch assembly, a rectification filter circuit and a load which are connected in sequence;
the energy transmitting coil and the energy receiving coil are coupled with each other;
in the initial charging stage, the switching switch component controls the secondary LCC type compensation circuit to be switched on, and the secondary S type compensation circuit is switched off, so that the load is charged at constant current; when the charging voltage reaches a preset voltage threshold value, the secondary S-type compensation circuit is controlled to be switched on through the change-over switch assembly, and the secondary LCC-type compensation circuit is switched off to perform constant-voltage charging on the load.
Further, the change-over switch assembly comprises a first switch, a second switch and a third switch; the secondary LCC type compensation circuit comprises a secondary compensation coil, a first compensation capacitor and a second compensation capacitor; the secondary side S-shaped compensation circuit comprises a third compensation capacitor; one end of the energy receiving coil is connected to one input end of the rectification filter circuit after passing through a series circuit of the first compensation capacitor and the secondary compensation coil, and the second switch is connected between one end of the energy receiving coil and the first compensation capacitor in series, or the second switch is connected between the first compensation capacitor and the secondary compensation coil in series, or the second switch is connected between the secondary compensation coil and one input end of the rectification filter circuit in series; the first switch and the third compensation capacitor are connected in series and then connected between one end of the energy receiving coil and one input end of the rectifying and filtering circuit; the third switch is connected between the serial node of the first compensation capacitor and the secondary compensation coil and the other end of the energy receiving coil after being connected with the second compensation capacitor in series; the other end of the energy receiving coil is connected with the other input end of the rectifying and filtering circuit.
Furthermore, the primary LCC type compensation circuit comprises a primary compensation coil, a fourth compensation capacitor and a fifth compensation capacitor, wherein one end of the primary compensation coil is connected with one output end of the full-bridge inverter circuit, and the other end of the primary compensation coil is respectively connected with one end of the fourth compensation capacitor and one end of the fifth compensation capacitor; the other end of the fourth compensation capacitor is connected with the other output end of the full-bridge inverter circuit and one end of the energy transmitting coil; the other end of the fifth compensation capacitor is connected with the other end of the energy transmitting coil.
Furthermore, the primary side compensation coil and the secondary side compensation coil both adopt double D type coils, and the placement positions of the primary side compensation coil and the secondary side compensation coil are mutually vertical; the energy transmitting coil and the energy receiving coil both adopt Q-type coils.
Furthermore, a first magnetic core is arranged on one side of the primary side compensation coil, which is far away from the energy transmitting coil; and a second magnetic core is arranged on one side of the secondary compensation coil, which is far away from the energy receiving coil.
Further, the first magnetic core, the primary side compensation coil and the energy emission coil are integrated together; the second magnetic core, the secondary side compensation coil and the energy receiving coil are integrated together.
In a second aspect, the present invention provides a wireless charging method for switching constant-current and constant-voltage charging modes, which is implemented by using the wireless charging system for switching constant-current and constant-voltage charging modes, and comprises the following steps:
the wireless charging system is powered on, the direct current power supply voltage sequentially passes through the full-bridge inverter circuit, the direct current voltage is converted into high-frequency alternating current voltage, and the high-frequency alternating current voltage is transmitted to the secondary side through the primary side LCC type compensation circuit and the energy transmitting coil;
the energy receiving coil of the secondary side receives the voltage of the energy transmitting coil, the LCC type compensation circuit of the secondary side is controlled to be switched on through the change-over switch assembly, and the S type compensation circuit of the secondary side is switched off to perform constant current charging on a load;
when the charging voltage reaches a preset voltage threshold value, the secondary S-type compensation circuit is controlled to be switched on through the change-over switch assembly, and the secondary LCC-type compensation circuit is switched off to perform constant-voltage charging on the load.
Further, the method for controlling the secondary LCC type compensation circuit to be switched on or off by the change-over switch assembly comprises the following steps: the switch is connected in series in the secondary LCC type compensation circuit, and the LCC type compensation circuit is switched on or off by controlling the on or off of the switch.
Further, the method for controlling the secondary side S-shaped compensation circuit to be switched on or off by the change-over switch assembly comprises the following steps: the switch is connected in series in the secondary side S-type compensation circuit, and the LCC type compensation circuit is switched on or off by controlling the on or off of the switch.
Further, the change-over switch assembly comprises a first switch, a second switch and a third switch; the first switch is connected in series in the secondary side S-type compensation circuit, and the second switch and the third switch are connected in series in the secondary side LCC-type compensation circuit.
The invention relates to a wireless charging system and a wireless charging method with constant-current constant-voltage charging mode switching, wherein in an initial charging stage, a secondary LCC type compensation circuit is controlled to be switched on through a switch, a secondary S type compensation circuit is controlled to be switched off, constant-current charging is carried out, when the voltage reaches a preset voltage threshold value, the secondary S type compensation circuit is controlled to be switched on through the switch, the secondary LCC type compensation circuit is switched off, and constant-voltage charging is carried out; the battery gassing phenomenon caused by overlarge current in the later charging period of constant-current charging is avoided, and the problems of overlarge current and long charging time in the initial constant-voltage charging period are also avoided; moreover, the output constant current and constant voltage control is realized by adopting an LCC-S/LCC type compensation network and a topology switching mode of a secondary side, an additional DC-DC circuit and an additional control mode are not required to be added, the system control is simplified, the structure is simple, and the system cost is saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of a wireless charging system with constant-current constant-voltage charging mode switching according to the present invention;
FIG. 2 is a schematic diagram of the current curve and voltage curve of the constant current and voltage charging process of the present invention;
FIG. 3 is a schematic diagram of the placement positions of the primary side compensation coil and the secondary side compensation coil according to the present invention;
fig. 4 is a schematic diagram of the winding mode of the primary and secondary double-D type coil.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
The wireless charging system with constant-current and constant-voltage charging mode switching comprises a transmitting end circuit and a receiving end circuit, as shown in fig. 1;
the transmitting end circuit comprises a direct current power supply, a full-bridge inverter circuit, a primary LCC type compensation circuit and an energy transmitting coil L which are connected in sequenceP；
The receiving end circuit comprises energy receiving coils L which are connected in sequenceSThe secondary LCC type compensation circuit and the secondary S type compensation circuit are controlled to be switched on and switched off through the change-over switch assembly, the rectification filter circuit and the load are controlled to be switched on and switched off;
the energy transmitting coil and the energy receiving coil are coupled to each other.
In the initial charging stage, the switch component is switched on, the secondary LCC type compensation circuit is controlled to be switched off, the secondary S type compensation circuit is controlled to be switched off, and the wireless charging system carries out constant-current charging on the load. When the charging voltage reaches a preset voltage threshold value, the secondary S-type compensation circuit is controlled to be switched on through the change-over switch assembly, the secondary LCC-type compensation circuit is switched off, and the wireless charging system performs constant-voltage charging on the load. The preset voltage threshold is set according to a specific battery capacity.
The constant-current constant-voltage charging curve is shown in fig. 2, the constant-current charging is performed in the initial stage, when the voltage reaches the preset voltage threshold, the constant-voltage charging is switched, and the charging current is continuously reduced along with the increase of the electric quantity of the battery until the battery is fully charged. Compared with constant-current charging, the constant-current and constant-voltage two-stage charging method avoids the phenomenon of battery gassing caused by overlarge current in the later charging period, and also avoids the problems of overlarge current and long charging time in the initial constant-voltage charging period. The constant-current and constant-voltage two-stage charging not only improves the charging efficiency, but also improves the performance and the service life of the battery.
Optionally, in this embodiment, the switch assembly includes a first switch S5A second switch S6And a third switch S7(ii) a The secondary LCC type compensation circuit comprises a secondary compensation coil Lf2A first compensation capacitor CS1A second compensation capacitor Cf2(ii) a The secondary side S-shaped compensation circuit comprises a third compensation capacitor CS2(ii) a One end of the energy receiving coil is connected with the secondary side compensating coil in series through the first compensating capacitorThe second switch is connected between one end of the energy receiving coil and the first compensation capacitor in series, or the second switch is connected between the first compensation capacitor and the secondary compensation coil in series, or the second switch is connected between the secondary compensation coil and one input end of the rectification filter circuit in series; the first switch and the third compensation capacitor are connected in series and then connected between one end of the energy receiving coil and one input end of the rectifying and filtering circuit; the third switch is connected between the serial node of the first compensation capacitor and the secondary compensation coil and the other end of the energy receiving coil after being connected with the second compensation capacitor in series; the other end of the energy receiving coil is connected with the other input end of the rectifying and filtering circuit.
Fig. 1 is an example to illustrate one of the connection relationships: first compensation capacitor CS1Is connected with an energy receiving coil LSOne terminal of (1), a first compensation capacitor CS1The other end of the secondary side compensation coil L is connected withf2And a second compensation capacitor Cf2One end of (a); secondary side compensating coil Lf2Is connected with a second switch S6One end of (a); second compensation capacitor Cf2Is connected with a third switch S at the other end7One end of (1), a third switch S7Is connected with an energy receiving coil L at the other endSThe other end of (a); a second switch S6And the other end of the third switch S7The other end of the input end of the rectifying and filtering circuit is connected with the input end of the rectifying and filtering circuit. One way of setting the position of the switch is given in fig. 1, and may be achieved in another way, such as S5At CS2To the right (with respect to the position in the figure), S6At Lf2Left side of or CS1Left side of, S7At Cf2The upper side of the secondary LCC type compensation circuit can be controlled to be switched on or off.
First switch S5And the secondary side S-shaped compensation circuit is positioned on the secondary side S-shaped compensation circuit and used for controlling the opening and closing of the secondary side S-shaped compensation circuit.
The second switch is arranged on the secondary side compensation coil Lf2And a first compensation capacitor CS1For controlling the series connection of the secondary compensation coil and the first compensation capacitorOpening and closing the road.
Third switch S7At the second compensation capacitor Cf2For controlling the opening and closing of the second compensation capacitor.
In the initial charging stage, the first switch is switched off, the second switch and the third switch are switched on, the secondary LCC type compensation circuit is switched on, the secondary S type compensation circuit is switched off, and constant-current charging is carried out. When the voltage reaches a preset voltage threshold value, the first switch is closed, the second switch and the third switch are disconnected, the auxiliary S-type compensation circuit is switched on, the auxiliary LCC-type compensation circuit is switched off, and constant-voltage charging is carried out.
Alternatively, in this embodiment, the primary LCC-type compensation circuit includes a primary compensation coil Lf1A fourth compensation capacitor Cf1And a fifth compensation capacitor CPOne end of the primary side compensation coil is connected with one output end of the full-bridge inverter circuit, and the other end of the primary side compensation coil is respectively connected with one end of the fourth compensation capacitor and one end of the fifth compensation capacitor; the other end of the fourth compensation capacitor is connected with the other output end of the full-bridge inverter circuit and one end of the energy transmitting coil; the other end of the fifth compensation capacitor is connected with the other end of the energy transmitting coil.
Referring to fig. 1 to illustrate the working principle of the present invention, the wireless charging system with constant-current and constant-voltage charging mode switching of this embodiment adopts an LCC-S/LCC topology, in which U is shown in the figureinFor DC power supply input, MOS transistor S1～S4Form a full bridge inverter circuit, Lf1、Cf1、CPAnd LPFor the primary compensation network, Lf2、Cf2、CS1、CS2And LSCompensating the network for the secondary side, wherein LPAnd LSA primary side energy transmitting coil and a secondary side energy receiving coil respectively. Diode D1～D4Forming a rectifying circuit, C is a filter capacitor, RLIs a load, S5(first switch), S6(second switch) and S7(third switch) is a topology switch assembly. When constant current charging is carried out, the secondary side adopts LCC topology, and S is carried out at the moment5Breaking, S6And S7Conducting; when constant voltage charging is performedThe secondary side adopts S topology, and S is adopted at the time5Conduction, S6And S7And disconnecting, thereby realizing the switching of the secondary side topology.
Primary side compensation coil L in primary side LCC type compensation circuitf1Secondary side compensating coil L in secondary side LCC type compensating circuitf2double-D type coils are adopted, and the two coils are perpendicular to each other in placement position so as to achieve mutual decoupling of the two coils, and the reference is made to figure 3. Fig. 3 shows the placement positions of the primary compensation coil and the secondary compensation coil. The winding mode of the primary and secondary double-D type coil is the same, and referring to FIG. 4, FIG. 4 shows the winding mode of the primary and secondary double-D type coil. The energy transmitting coil and the energy receiving coil are Q-shaped coils which are mutually coupled. For this coupling mechanism, decoupling of the compensation coil and the energy coil can be achieved.
In one embodiment, a COMSOL is used for building a simulation model for simulation, and when only the primary Q-type energy transmitting coil is excited by current, the mutual inductance of the primary and secondary energy coils is 15.497uH, and the mutual inductance of the secondary double-D compensation coil and the primary Q-type energy coil is 0.0588 uH. When the current of the primary side double D-type compensation coil is only excited, the mutual inductance of the secondary side energy Q-type coil and the primary side double D-type compensation coil is 0.0023uH, which can be obtained through simulation calculation. The coupling mechanism of the embodiment can realize the decoupling of the primary and secondary side energy coils and the compensation coil while reducing the volume.
Optionally, in this embodiment, a first magnetic core is disposed on a side of the primary compensation coil away from the energy emitting coil, that is, an energy emitting coil and a first magnetic core are disposed on two sides of the primary compensation coil, respectively; and a second magnetic core is arranged on one side of the secondary compensation coil, which is far away from the energy receiving coil, namely the two sides of the secondary compensation coil are respectively provided with the energy receiving coil and the second magnetic core. The magnetic coupling capability is improved by the magnetic core.
Optionally, in this embodiment, the first magnetic core, the primary compensation coil, and the energy transmitting coil are integrated together; the second magnetic core, the secondary compensation coil and the energy receiving coil are integrated together. Based on a magnetic integration method, a primary side magnetic core, an energy coil and a compensation coil are wound together, and a secondary side magnetic core, an energy coil and a compensation coil are wound together, so that the coupling mechanism of the wireless charging system is small in size and saves space.
Through the implementation of the embodiment, the phenomenon of battery gassing caused by overlarge current in the later charging period of constant-current charging is avoided, and the problems of overlarge current and long charging time in the initial charging period of constant-voltage charging are also avoided; moreover, the output constant current and constant voltage control is realized by adopting an LCC-S/LCC type compensation network and a topology switching mode of a secondary side, an additional DC-DC circuit and an additional control mode are not required to be added, the system control is simplified, the structure is simple, and the system cost is saved.
The embodiment also provides a wireless charging method for switching constant-current and constant-voltage charging modes, which is implemented by using the wireless charging system for switching constant-current and constant-voltage charging modes, and comprises the following steps:
when the wireless charging system is powered on, the direct current power supply voltage sequentially passes through the full-bridge inverter circuit, the direct current voltage is converted into high-frequency alternating current voltage, and the high-frequency alternating current voltage is transmitted to the secondary side through the primary side LCC type compensation circuit and the energy transmitting coil.
And the energy receiving coil of the secondary side receives the voltage of the energy transmitting coil, the LCC type compensation circuit of the secondary side is controlled to be switched on through the change-over switch assembly, and the S type compensation circuit of the secondary side is switched off to perform constant current charging on the load.
When the charging voltage reaches a preset voltage threshold value, the secondary S-type compensation circuit is controlled to be switched on through the change-over switch assembly, and the secondary LCC-type compensation circuit is switched off to perform constant-voltage charging on the load.
Further, the method for controlling the secondary LCC type compensation circuit to be switched on or off by the change-over switch assembly comprises the following steps: the switch is connected in series in the secondary LCC type compensation circuit, and the LCC type compensation circuit is switched on or off by controlling the on or off of the switch.
Further, the method for controlling the secondary side S-shaped compensation circuit to be switched on or off by the change-over switch assembly comprises the following steps: the switch is connected in series in the secondary side S-type compensation circuit, and the LCC type compensation circuit is switched on or off by controlling the on or off of the switch.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The above description is for the purpose of illustrating embodiments of the invention and is not intended to limit the invention, and it will be apparent to those skilled in the art that any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the invention shall fall within the protection scope of the invention.

Claims (10)

1. A wireless charging system with constant-current and constant-voltage charging mode switching comprises a transmitting end circuit and a receiving end circuit; the transmitting end circuit comprises a direct-current power supply, a full-bridge inverter circuit, a primary LCC type compensation circuit and an energy transmitting coil which are connected in sequence; the method is characterized in that:
the receiving end circuit comprises an energy receiving coil, a secondary LCC type compensation circuit and a secondary S type compensation circuit which are controlled to be switched on and switched off by a change-over switch assembly, a rectification filter circuit and a load which are connected in sequence;
the energy transmitting coil and the energy receiving coil are coupled with each other;
in the initial charging stage, the switching switch component controls the secondary LCC type compensation circuit to be switched on, and the secondary S type compensation circuit is switched off, so that the load is charged at constant current; when the charging voltage reaches a preset voltage threshold value, the secondary S-type compensation circuit is controlled to be switched on through the change-over switch assembly, and the secondary LCC-type compensation circuit is switched off to perform constant-voltage charging on the load.
2. The wireless charging system with constant-current and constant-voltage charging mode switching according to claim 1, wherein: the change-over switch assembly comprises a first switch, a second switch and a third switch; the secondary LCC type compensation circuit comprises a secondary compensation coil, a first compensation capacitor and a second compensation capacitor; the secondary side S-shaped compensation circuit comprises a third compensation capacitor; one end of the energy receiving coil is connected to one input end of the rectification filter circuit after passing through a series circuit of the first compensation capacitor and the secondary compensation coil, and the second switch is connected between one end of the energy receiving coil and the first compensation capacitor in series, or the second switch is connected between the first compensation capacitor and the secondary compensation coil in series, or the second switch is connected between the secondary compensation coil and one input end of the rectification filter circuit in series; the first switch and the third compensation capacitor are connected in series and then connected between one end of the energy receiving coil and one input end of the rectifying and filtering circuit; the third switch is connected between the serial node of the first compensation capacitor and the secondary compensation coil and the other end of the energy receiving coil after being connected with the second compensation capacitor in series; the other end of the energy receiving coil is connected with the other input end of the rectifying and filtering circuit.
3. The wireless charging system with constant-current and constant-voltage charging mode switching according to claim 1, wherein: the primary LCC type compensation circuit comprises a primary compensation coil, a fourth compensation capacitor and a fifth compensation capacitor, wherein one end of the primary compensation coil is connected with one output end of the full-bridge inverter circuit, and the other end of the primary compensation coil is respectively connected with one end of the fourth compensation capacitor and one end of the fifth compensation capacitor; the other end of the fourth compensation capacitor is connected with the other output end of the full-bridge inverter circuit and one end of the energy transmitting coil; the other end of the fifth compensation capacitor is connected with the other end of the energy transmitting coil.
4. The wireless charging system with constant-current and constant-voltage charging mode switching according to claim 1, wherein: the primary side compensation coil and the secondary side compensation coil both adopt double D type coils, and the placement positions of the primary side compensation coil and the secondary side compensation coil are vertical to each other; the energy transmitting coil and the energy receiving coil both adopt Q-type coils.
5. The wireless charging system with constant-current and constant-voltage charging mode switching according to claim 1, wherein: a first magnetic core is arranged on one side of the primary side compensation coil, which is far away from the energy transmitting coil; and a second magnetic core is arranged on one side of the secondary compensation coil, which is far away from the energy receiving coil.
6. The wireless charging system with constant-current and constant-voltage charging mode switching according to claim 5, wherein: the first magnetic core, the primary side compensation coil and the energy transmitting coil are integrated together; the second magnetic core, the secondary side compensation coil and the energy receiving coil are integrated together.
7. A wireless charging method for switching constant-current constant-voltage charging mode, which is implemented by using the wireless charging system for switching constant-current constant-voltage charging mode of any one of claims 1 to 7, and comprises the following steps:
the wireless charging system is powered on, the direct current power supply voltage sequentially passes through the full-bridge inverter circuit, the direct current voltage is converted into high-frequency alternating current voltage, and the high-frequency alternating current voltage is transmitted to the secondary side through the primary side LCC type compensation circuit and the energy transmitting coil;
the energy receiving coil of the secondary side receives the voltage of the energy transmitting coil, the LCC type compensation circuit of the secondary side is controlled to be switched on through the change-over switch assembly, and the S type compensation circuit of the secondary side is switched off to perform constant current charging on a load;
when the charging voltage reaches a preset voltage threshold value, the secondary S-type compensation circuit is controlled to be switched on through the change-over switch assembly, and the secondary LCC-type compensation circuit is switched off to perform constant-voltage charging on the load.
8. The wireless charging method with constant-current and constant-voltage charging mode switching according to claim 7, wherein the method for controlling the secondary LCC type compensation circuit to be switched on or off by the switching element comprises the following steps: the switch is connected in series in the secondary LCC type compensation circuit, and the LCC type compensation circuit is switched on or off by controlling the on or off of the switch.
9. The wireless charging method with constant-current and constant-voltage charging mode switching according to claim 7, wherein the method for controlling the secondary side S-shaped compensation circuit to be switched on or off by the switching module comprises the following steps: the switch is connected in series in the secondary side S-type compensation circuit, and the LCC type compensation circuit is switched on or off by controlling the on or off of the switch.
10. The wireless charging method with constant-current and constant-voltage charging mode switching according to claim 8 or 9, wherein the switch assembly comprises a first switch, a second switch and a third switch; the first switch is connected in series in the secondary side S-type compensation circuit, and the second switch and the third switch are connected in series in the secondary side LCC-type compensation circuit.
CN202110789343.0A 2021-07-13 2021-07-13 Wireless charging system and method for switching constant-current constant-voltage charging mode Pending CN113629799A (en)

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