CN115250011A - Single-tube P-CLC variable-frequency switching constant-current constant-voltage wireless charging device and method - Google Patents

Single-tube P-CLC variable-frequency switching constant-current constant-voltage wireless charging device and method Download PDF

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CN115250011A
CN115250011A CN202111601113.3A CN202111601113A CN115250011A CN 115250011 A CN115250011 A CN 115250011A CN 202111601113 A CN202111601113 A CN 202111601113A CN 115250011 A CN115250011 A CN 115250011A
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circuit
constant
frequency
voltage
current
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王春芳
王京雨
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Qingdao University
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Qingdao University
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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
    • 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
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • 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
    • H02J50/005—Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
    • 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
    • H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
    • 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
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • H02J7/00036—Charger exchanging data with battery
    • 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
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements

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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 belongs to the technical field of induction type wireless charging, and relates to a single-tube P-CLC frequency conversion switching constant-current constant-voltage wireless charging device and a method, alternating current is sequentially rectified by a first power frequency rectifier bridge and filtered by a first power frequency filter capacitor and then converted into direct current, direct current is sequentially inverted into high-frequency alternating current by a first compensation network, a transmitting coil, a receiving coil and a second compensation network, the high-frequency alternating current is sequentially converted into direct current by a second high-frequency rectifier bridge, a first high-frequency filter inductor and a second high-frequency filter capacitor to charge a storage battery, when the voltage of the storage battery rises to a set value, switching frequency is carried out, and charging is converted from a constant-current mode to a constant-voltage mode; the circuit has the advantages of simple structure, safe and reliable work, low switching loss, low cost and high efficiency, and can switch the switching frequency in a narrow frequency band to meet the requirement of constant-current and constant-voltage charging of the storage battery.

Description

Single-tube P-CLC variable-frequency switching constant-current constant-voltage wireless charging device and method
Technical Field
The invention belongs to the technical field of induction type wireless charging, and relates to a frequency conversion switching constant-current constant-voltage wireless charging device and method of a single-tube P-CLC (transmitting end P-type compensation and receiving end CLC compensation, P-CLC for short), which enable a single-tube circuit to be charged in a narrow frequency band by frequency conversion switching constant-current constant-voltage, and abandon four switching tubes of a full-bridge circuit, an additional control circuit and a complex closed-loop control flow.
Background
Currently, most of researches on a constant current-constant voltage compensation topology of an Inductive Power Transfer (IPT) system are based on a full-bridge inversion topology. Due to the particularity of the structure of the single-tube LC resonance inverter circuit, the existing compensation network and design method suitable for the full-bridge circuit cannot be suitable for the single-tube circuit. Compared with a single-tube LC resonance inverter circuit, the full-bridge voltage type inverter circuit has a relatively complex structure, switching tubes of an upper bridge arm and a lower bridge arm are easy to be directly communicated and burnt out, and the full-bridge voltage type inverter circuit has a plurality of switching devices, is complex to control, has large switching loss and is high in use cost. Therefore, it is urgently needed to introduce a new P-CLC compensation topology on the single-transistor circuit and to implement mode switching between the constant current and the constant voltage through the working frequency switching in a narrow range on the single-transistor circuit by a reasonable compensation network parameter design, so as to provide great research and application development values for the constant current-constant voltage compensation topology output on the single-transistor circuit.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, designs and provides a single-tube P-CLC frequency conversion switching constant-current constant-voltage wireless charging device and method, overcomes the current situation that the research blank that the constant-current constant-voltage output can not be realized by using a single-tube circuit to realize the down-conversion of a narrow frequency band is filled, and changes the working frequency from the working frequency f in a constant-current mode CC Switching to operating frequency f in constant voltage mode CV The method for switching the constant-current output mode to the constant-voltage output mode is realized, and a mode switch and a corresponding control circuit for switching topology are omitted.
In order to achieve the purpose, the main structure of the single-tube P-CLC frequency conversion switching constant-current constant-voltage wireless charging device comprises a first power frequency rectifier bridge, a first power frequency filter capacitor, a first compensation network, a transmitting coil, a receiving coil, a second compensation network, a second high-frequency rectifier bridge, a first high-frequency filter inductor, a second high-frequency filter capacitor, a storage battery, a secondary side detection circuit and a primary side control circuit, wherein the primary side control circuit 10 consists of a primary side auxiliary power supply, a primary side single-chip microcomputer control circuit, a primary side wireless communication circuit, a primary side voltage detection circuit and a switch tube driving circuit, the secondary side detection circuit consists of a secondary side auxiliary power supply, a secondary side single-chip microcomputer control circuit, a secondary side wireless communication circuit, a voltage sampling circuit and a current sampling circuit, the input end of the first power frequency rectifier bridge is connected with an alternating current power supply, the output end of the first power frequency rectifier bridge is connected with the input end of the first power frequency filter capacitor, and alternating current is sequentially rectified by the first power frequency rectifier bridge and then converted into direct current to supply the main circuit; the output end of the first power frequency filter capacitor is connected with the input end of a first compensation network, the switch tube and the diode are connected with the first compensation network, the output end of the first compensation network is connected with the transmitting coil, the input end of a second compensation network is connected with the receiving coil, direct electricity sequentially passes through the first compensation network, the transmitting coil, the receiving coil and the second compensation network, and then is inverted into high-frequency alternating current through LC resonance formed after the switch tube is switched on, clamped and switched off, the output end of the second compensation network is connected with the input end of a second high-frequency rectifier bridge, the first high-frequency filter inductor and the second high-frequency filter capacitor are sequentially connected, the storage battery is connected with the output end of the second high-frequency filter capacitor, and the high-frequency alternating current is sequentially converted into direct current through the second high-frequency rectifier bridge, the first high-frequency filter inductor and the second high-frequency filter capacitor to charge the storage battery; the primary side auxiliary power supply is respectively connected with the first power frequency filter capacitor, the first compensation network, the primary side single chip microcomputer control circuit, the primary side wireless communication circuit, the primary side voltage detection circuit and the switching tube driving circuit, the primary side voltage detection circuit is connected with the diode, the switching tube driving circuit is connected with the switching tube, and the primary side single chip microcomputer control circuit is respectively connected with the primary side wireless communication circuit, the primary side voltage detection circuit and the switching tube driving circuit; the storage battery is respectively connected with the voltage sampling circuit, the current sampling circuit and the secondary side auxiliary power supply, the secondary side single chip microcomputer control circuit is respectively connected with the secondary side auxiliary power supply, the secondary side wireless communication circuit, the voltage sampling circuit and the current sampling circuit, the secondary side auxiliary power supply is respectively connected with the voltage sampling circuit, the current sampling circuit and the secondary side wireless communication circuit, when the voltage of the storage battery rises to a set value, switching frequency is carried out, and charging is changed from a constant current mode to a constant voltage mode.
The specific process for realizing constant-current and constant-voltage charging of the invention is as follows:
(1) Starting an alternating current power supply, wherein alternating current is rectified and filtered by a first power frequency rectifier bridge and a first power frequency filter capacitor to supply power to a primary side auxiliary power supply, so that a primary side control circuit works normally; the storage battery supplies power to the secondary side auxiliary power supply, so that the secondary side state detection circuit works normally;
(2) Setting the initial state as a constant current charging mode, and charging the storage battery, wherein the switching frequency in the mode is f CC And in the stage, the secondary singlechip control circuit firstly performs digital-to-analog conversion on the voltage signal acquired by the voltage sampling circuit, when the acquired voltage signal is judged to be lower than the set output value of the constant voltage mode, the secondary wireless communication circuit does not send a state switching instruction to the primary wireless communication circuit, then the current sampling circuit performs digital-to-analog conversion on the acquired signal, and the expected fine tuning working frequency f is sent CC After the instructions are received and processed by the primary side wireless communication circuit and the primary side single chip microcomputer control circuit, the switching tube driving circuit sends out switching tube driving PWM waveforms with expected frequency, and therefore output current is kept constant;
(3) In a constant-current charging mode, when the terminal voltage of the storage battery is detected to reach a set switching value, the voltage sampling circuit collects a voltage signal and the voltage signal is processed by the secondary single-chip microcomputer control circuit, the secondary wireless communication circuit sends a state switching instruction to the primary wireless communication circuit, the circuit is switched from constant-current charging to constant-voltage charging, the secondary single-chip microcomputer control circuit and the secondary wireless communication circuit feed back the voltage signal collected by the voltage sampling circuit to the primary wireless communication circuit and the primary single-chip microcomputer control circuit, and the working frequency f is finely adjusted according to the expected set working frequency f CV The program of (2) makes the output voltage constant;
(4) In the constant-voltage charging stage, when the current of the storage battery is detected to be reduced to the minimum charging current value for charging the storage battery, the charging is proved to be finished, and at the moment, a secondary singlechip control circuit and a secondary wireless communication circuit send a stop instruction; and after the primary side wireless communication circuit and the primary side single-chip microcomputer control circuit receive the stop instruction, the generation of the PWM waveform is stopped, so that the switching tube driving circuit stops sending PWM pulse signals, and the charging is finished.
Compared with the prior art, the invention has the advantages of simple circuit structure, safe and reliable work, low switching loss, low cost and high efficiency, and can realize the requirement of constant-current and constant-voltage charging of the storage battery by switching the switching frequency in a narrow frequency band.
Description of the drawings:
fig. 1 is a schematic diagram of a circuit structure of the single-tube P-CLC variable-frequency switching constant-current constant-voltage wireless charging device according to the present invention.
Fig. 2 is a schematic diagram of a working process of the single-tube P-CLC variable-frequency switching constant-current constant-voltage wireless charging device according to the present invention.
Fig. 3 is a mutual inductance equivalent model in the constant current mode according to the present invention.
Fig. 4 is a mutual inductance equivalent model in the constant voltage mode according to the present invention.
The specific implementation mode is as follows:
the technical scheme of the invention is further explained according to the attached drawings and the specific embodiment.
The embodiment is as follows:
the main structure of the single-tube P-CLC variable-frequency switching constant-current constant-voltage wireless charging device of this embodiment includes a first power-frequency rectifier bridge 1, a first power-frequency filter capacitor 2, a first compensation network 3, a transmitting coil Lp, a receiving coil Ls, a second compensation network 4, a second high-frequency rectifier bridge 5, a first high-frequency filter inductor 6, a second high-frequency filter capacitor 7, a storage battery 8, a secondary side detection circuit 9, and a primary side control circuit 10, wherein the primary side control circuit 10 is composed of a primary side auxiliary power supply 16, a primary side monolithic computer control circuit 19, a primary side wireless communication circuit 17, a primary side voltage detection circuit 18, and a switching tube driving circuit 20, the secondary side detection circuit 9 is composed of a secondary side auxiliary power supply 13, a secondary side monolithic computer control circuit 15, a secondary side wireless communication circuit 14, a voltage sampling circuit 11, and a current sampling circuit 12, an input end of the first power-frequency rectifier bridge 1 is connected to an AC power supply, an output end is connected to an input end of the first power-frequency filter capacitor 2, and AC power passes through the first power-frequency rectifier bridge sequentiallyThe power frequency rectifier bridge 1 rectifies and the first power frequency filter capacitor 2 filters the power frequency signal and then converts the rectified signal into direct current to supply power to the main circuit; the output end of the first power frequency filter capacitor 2 is connected with the input end of the first compensation network 3, and the switch tube Q and the diode D are connected Q The output end of the first compensation network 3 is connected with a transmitting coil Lp, the input end of the second compensation network 4 is connected with a receiving coil Ls, direct electricity sequentially passes through the first compensation network 3, the transmitting coil Lp, the receiving coil Ls and the second compensation network 4, and then direct current is inverted into high-frequency alternating current through LC resonance formed after the switching tube Q is switched on, clamped and switched off, the output end of the second compensation network 4 is connected with the input end of a second high-frequency rectifier bridge 5, the second high-frequency rectifier bridge 5, a first high-frequency filter inductor 6 and a second high-frequency filter capacitor 7 are sequentially connected, a storage battery 8 is connected with the output end of the second high-frequency filter capacitor, and the high-frequency alternating current is sequentially converted into direct current through the second high-frequency rectifier bridge 5, the first high-frequency filter inductor 6 and the second high-frequency filter capacitor 7 to charge the storage battery 8; the primary side auxiliary power supply 16 is respectively connected with the first power frequency filter capacitor 2, the first compensation network 3, the primary side single chip microcomputer control circuit 19, the primary side wireless communication circuit 17, the primary side voltage detection circuit 18 and the switching tube driving circuit 20, and the primary side voltage detection circuit 1 is connected with the diode D Q The switching tube driving circuit 20 is connected with the switching tube Q, and the primary side single chip microcomputer control circuit 19 is respectively connected with the primary side wireless communication circuit 17, the primary side voltage detection circuit 18 and the switching tube driving circuit 20; the storage battery 8 is respectively connected with a voltage sampling circuit 11, a current sampling circuit 12 and a secondary auxiliary power supply 13, a secondary single chip microcomputer control circuit 15 is respectively connected with the secondary auxiliary power supply 13, a secondary wireless communication circuit 14, the voltage sampling circuit 11 and the current sampling circuit 12, the secondary auxiliary power supply 13 is respectively connected with the voltage sampling circuit 11, the current sampling circuit 12 and the secondary wireless communication circuit 14, when the voltage of the storage battery 8 rises to a set value, switching frequency is switched, and charging is changed from a constant current mode to a constant voltage mode.
The specific process for realizing constant-current and constant-voltage charging in this embodiment is as follows:
(1) Starting an alternating current power supply AC, and after the alternating current is rectified and filtered by a first power frequency rectifier bridge 1 and a first power frequency filter capacitor 2, supplying power to a primary side auxiliary power supply 16 to ensure that a primary side control circuit 10 works normally; the secondary side auxiliary power supply 13 is powered by the storage battery 8, so that the secondary side state detection circuit 9 works normally;
(2) Setting the initial state as a constant current charging mode, and charging the storage battery 8, wherein the switching frequency in the mode is f CC And in this stage, the secondary singlechip control circuit 15 performs digital-to-analog conversion on the voltage signal acquired by the voltage sampling circuit 11, when the acquired voltage signal is judged to be lower than the set output value of the constant voltage mode, the secondary wireless communication circuit 15 does not send a state switching instruction to the primary wireless communication circuit 17, then the current sampling circuit 12 performs digital-to-analog conversion on the acquired signal, and the expected fine tuning working frequency f is sent CC After being received and processed by the primary side wireless communication circuit 17 and the primary side single chip microcomputer control circuit 19, the command of (1) enables the switching tube driving circuit 20 to send out a switching tube driving PWM waveform with expected frequency, so that the output current is kept constant;
(3) In a constant-current charging mode, when the voltage of the storage battery 8 is detected to reach a set switching value, the voltage sampling circuit 11 collects a voltage signal and the voltage signal is processed by the secondary single-chip microcomputer control circuit 15, the secondary wireless communication circuit 14 sends a state switching instruction to the primary wireless communication circuit 17, the circuit is switched from constant-current charging to constant-voltage charging, the secondary single-chip microcomputer control circuit 15 and the secondary wireless communication circuit 14 feed back the voltage signal collected by the voltage sampling circuit 11 to the primary wireless communication circuit 17 and the primary single-chip microcomputer control circuit 19, and the fine-tuning working frequency f is set according to expectation CV The program of (2) makes the output voltage constant;
(4) In the constant voltage charging stage, when the current of the storage battery 8 is detected to be reduced to the minimum charging current value for charging the storage battery, the charging is proved to be completed, and at the moment, a stop instruction is sent by the secondary singlechip control circuit 15 and the secondary wireless communication circuit 14; after the primary side wireless communication circuit 17 and the primary side single chip microcomputer control circuit 19 receive the stop instruction, the generation of the PWM waveform is terminated, so that the switching tube driving circuit 20 stops sending the PWM pulse signal, and the charging is finished.
In the present embodiment, in the constant current charging mode, the circuit satisfies the following conditions:
Figure BDA0003431827180000051
in the constant voltage charging mode, the circuit only needs to satisfy the conditions:
Figure BDA0003431827180000052
wherein, ω is CC Is the working angular frequency, omega, in the constant current mode CV For the working angular frequency in the constant voltage mode, two working angular frequencies can be controlled in a narrower frequency band.
The technologies not described in detail in this embodiment are all the prior arts.

Claims (2)

1. A single-tube P-CLC frequency conversion switching constant-current constant-voltage wireless charging device is characterized in that a main structure comprises a first power frequency rectifier bridge, a first power frequency filter capacitor, a first compensation network, a transmitting coil, a receiving coil, a second compensation network, a second high-frequency rectifier bridge, a first high-frequency filter inductor, a second high-frequency filter capacitor, a storage battery, a secondary side detection circuit and a primary side control circuit, wherein the primary side control circuit 10 comprises a primary side auxiliary power supply, a primary side single-chip microcomputer control circuit, a primary side wireless communication circuit, a primary side voltage detection circuit and a switch tube driving circuit, the secondary side detection circuit comprises a secondary side auxiliary power supply, a secondary side single-chip microcomputer control circuit, a secondary side wireless communication circuit, a voltage sampling circuit and a current sampling circuit, the input end of the first power frequency rectifier bridge is connected with an alternating current power supply, the output end of the first power frequency rectifier bridge is connected with the input end of the first power frequency filter capacitor, alternating current is sequentially rectified by the first power frequency rectifier bridge and filtered by the first power frequency filter capacitor to be converted into direct current to supply the main circuit; the output end of the first power frequency filter capacitor is connected with the input end of a first compensation network, the switch tube and the diode are connected with the first compensation network, the output end of the first compensation network is connected with the transmitting coil, the input end of a second compensation network is connected with the receiving coil, direct electricity sequentially passes through the first compensation network, the transmitting coil, the receiving coil and the second compensation network, and then is inverted into high-frequency alternating current through LC resonance formed after the switch tube is switched on, clamped and switched off, the output end of the second compensation network is connected with the input end of a second high-frequency rectifier bridge, the first high-frequency filter inductor and the second high-frequency filter capacitor are sequentially connected, the storage battery is connected with the output end of the second high-frequency filter capacitor, and the high-frequency alternating current is sequentially converted into direct current through the second high-frequency rectifier bridge, the first high-frequency filter inductor and the second high-frequency filter capacitor to charge the storage battery; the primary side auxiliary power supply is respectively connected with the first power frequency filter capacitor, the first compensation network, the primary side single chip microcomputer control circuit, the primary side wireless communication circuit, the primary side voltage detection circuit and the switching tube driving circuit; the storage battery is respectively connected with the voltage sampling circuit, the current sampling circuit and the secondary side auxiliary power supply, the secondary side single chip microcomputer control circuit is respectively connected with the secondary side auxiliary power supply, the secondary side wireless communication circuit, the voltage sampling circuit and the current sampling circuit, and the secondary side auxiliary power supply is respectively connected with the voltage sampling circuit, the current sampling circuit and the secondary side wireless communication circuit.
2. A method for realizing constant-current constant-voltage wireless charging by using the device as claimed in claim 1, which is characterized by comprising the following specific processes:
(1) Starting an alternating current power supply, wherein alternating current is rectified and filtered by a first power frequency rectifier bridge and a first power frequency filter capacitor to supply power to a primary side auxiliary power supply, so that a primary side control circuit works normally; the storage battery supplies power to the secondary side auxiliary power supply, so that the secondary side state detection circuit works normally;
(2) Setting the initial state as a constant current charging mode, and charging the storage battery, wherein the switching frequency in the mode is f CC And in this stage, the secondary side single chip microcomputer control circuit firstly carries out digital-to-analog conversion on the voltage signal acquired by the voltage sampling circuit, and when the acquired voltage is judgedWhen the voltage signal is lower than the set output value of the constant voltage mode, the secondary wireless communication circuit does not send a state switching instruction to the primary wireless communication circuit, then the current sampling circuit carries out digital-to-analog conversion on the acquired signal, and the expected fine-tuning working frequency f is sent CC After the instructions are received and processed by the primary side wireless communication circuit and the primary side single chip microcomputer control circuit, the switching tube driving circuit sends out switching tube driving PWM waveforms with expected frequency, and therefore output current is kept constant;
(3) In a constant-current charging mode, when the terminal voltage of the storage battery is detected to reach a set switching value, the voltage sampling circuit collects a voltage signal and the voltage signal is processed by the secondary single-chip microcomputer control circuit, the secondary wireless communication circuit sends a state switching instruction to the primary wireless communication circuit, the circuit is switched from constant-current charging to constant-voltage charging, the secondary single-chip microcomputer control circuit and the secondary wireless communication circuit feed back the voltage signal collected by the voltage sampling circuit to the primary wireless communication circuit and the primary single-chip microcomputer control circuit, and the working frequency f is finely adjusted according to the expected set working frequency f CV The program of (2) makes the output voltage constant;
(4) In the constant-voltage charging stage, when the current of the storage battery is detected to be reduced to the minimum charging current value for charging the storage battery, the charging is proved to be completed, and at the moment, a secondary-side single chip microcomputer control circuit and a secondary-side wireless communication circuit send a stop instruction; and after the primary side wireless communication circuit and the primary side single chip microcomputer control circuit receive the stop instruction, the generation of the PWM waveform is stopped, so that the switching tube driving circuit stops sending PWM pulse signals, and the charging is finished.
CN202111601113.3A 2021-12-24 2021-12-24 Single-tube P-CLC variable-frequency switching constant-current constant-voltage wireless charging device and method Pending CN115250011A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115425857A (en) * 2022-11-07 2022-12-02 西安霍威电源有限公司 Method and circuit for converting constant current into constant voltage

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115425857A (en) * 2022-11-07 2022-12-02 西安霍威电源有限公司 Method and circuit for converting constant current into constant voltage
CN115425857B (en) * 2022-11-07 2023-02-24 西安霍威电源有限公司 Method and circuit for converting constant current into constant voltage

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