CN112311107A - Single-tube inversion inductive coupling electric energy transmission device and control method thereof - Google Patents
Single-tube inversion inductive coupling electric energy transmission device and control method thereof Download PDFInfo
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- 239000003990 capacitor Substances 0.000 claims abstract description 58
- 230000005669 field effect Effects 0.000 claims abstract description 35
- 238000010280 constant potential charging Methods 0.000 claims abstract description 14
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- 238000005070 sampling Methods 0.000 claims description 45
- 238000007600 charging Methods 0.000 claims description 19
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- 238000012935 Averaging Methods 0.000 description 1
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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
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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
- H02J50/80—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
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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
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging 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
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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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
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
- H02J7/04—Regulation of charging current or voltage
Abstract
The invention belongs to the technical field of electricity, and relates to a single-tube inversion inductive coupling electric energy transmission device and a control method thereof.A power frequency alternating current is converted into a direct current after passing through a power frequency rectifier bridge and a power frequency filter capacitor, and then the direct current is inverted into a high-frequency alternating current by a first field effect tube and a second field effect tube; high-frequency alternating current is respectively applied to two ends of a transmitting coil of the primary side first resonant network and two ends of a transmitting coil of the secondary side resonant network, current is induced at two ends of a receiving coil of the secondary side resonant network, the current is changed into required direct current after passing through the secondary side resonant network and the high-frequency rectifying circuit, and finally, a storage battery is charged; the control is simple, the switching loss is low, the transmission of larger power can be realized by a double-input single-output structure, the voltage born by a single switching tube is reduced, and the requirement on constant-current and constant-voltage charging of the storage battery can be realized.
Description
The technical field is as follows:
the invention belongs to the technical field of electricity, and relates to a device and a method for realizing constant-current and constant-voltage wireless charging through a secondary side switching compensation network by a single-tube-based double-input single-output circuit, namely a single-tube inversion inductive coupling electric energy transmission device capable of carrying out constant-current and constant-voltage wireless charging on a storage battery and a control method thereof.
Background art:
at present, a full-bridge or half-bridge inverter circuit is mostly adopted in a main circuit topology of a constant current-constant voltage charging system based on an Inductive Power Transfer (IPT) technology, and no relevant literature for realizing constant current-constant voltage wireless charging through switching of a secondary compensation network by an inverter circuit with a double-input single-output structure based on single-tube LC resonance exists. Compared with the traditional single-input single-output single-tube inverter circuit, the single-tube inverter circuit with the double-input single-output structure can reduce the withstand voltage of a switching tube and can make the power more than kilowatt level. The control method for switching the secondary side compensation parameters is simpler than the method for switching the frequency on the basis of realizing the constant current-constant voltage. Therefore, the single-tube-based double-input single-output circuit device and the control method for realizing constant-current and constant-voltage wireless variable-parameter charging, which are suitable for kilowatt-level and have the advantages of simple circuit structure, low cost and high reliability, are designed, and have great practical values.
The invention content is as follows:
the invention aims to overcome the defects of the prior art, solve the problems that the bearing voltage of a switching tube of a wireless power transmission circuit based on LC resonance single-tube inversion is high and the wireless charging of high-power constant-voltage output cannot be realized at present, and design and provide a single-tube inversion inductive coupling power transmission device and a control method thereof.
In order to achieve the purpose, the main structure of the single-tube inversion inductive coupling electric energy transmission device comprises a power frequency rectifier bridge, a first power frequency filter capacitor, a second power frequency filter capacitor, a primary side first resonant network, a primary side second resonant network, a switching tube, a secondary side resonant network, a high-frequency rectifier circuit, a high-frequency filter capacitor, a storage battery, a primary side control circuit and a secondary side control circuit; an alternating current power supply is connected with an input end of a power frequency rectifier bridge, an anode output end and a cathode output end of the power frequency rectifier bridge are respectively connected with an anode of a first power frequency filter capacitor and a cathode of a second power frequency filter capacitor, a cathode of the first power frequency filter capacitor is connected with an anode of the second power frequency filter capacitor, an anode of the first power frequency filter capacitor is connected with an input end of a primary side first resonant network, an anode of the second power frequency filter capacitor is connected with an input end of a primary side second resonant network, a cathode output end of the power frequency rectifier bridge, a cathode of the second power frequency filter capacitor and a source electrode of a second field effect tube in the primary side second resonant network are respectively connected with a ground wire of the primary side, a first transmitting coil in the primary side first resonant network and a second transmitting coil in the second resonant network share a BP coil, and the BP coil is composed of two identical, partially overlapped and mutually decoupled coils, the output ends of the primary side first resonant network and the primary side second resonant network are respectively connected with the drains of the corresponding first field effect transistor and the second field effect transistor; the secondary side resonance network is cascaded with the high-frequency rectifier bridge, wherein the positive electrode output end of the high-frequency rectifier bridge and the negative electrode of the high-frequency filter capacitor are connected with the positive electrode of the storage battery, the negative electrode output end of the high-frequency rectifier bridge and the negative electrode of the high-frequency filter capacitor are connected with the negative electrode of the storage battery, power frequency alternating current is converted into direct current after passing through the power frequency rectifier bridge and the power frequency filter capacitor, and then the direct current is reversely converted into high-frequency alternating current by the first field effect tube and the second field effect tube; high-frequency alternating current is respectively applied to two ends of a transmitting coil of the primary side first resonant network and two ends of a transmitting coil of the secondary side resonant network, current is induced at two ends of a receiving coil of the secondary side resonant network, the current is changed into required direct current after passing through the secondary side resonant network and the high-frequency rectifying circuit, and finally, a storage battery can be charged; the power frequency rectifier bridge rectifies power frequency alternating current; the first power frequency filter capacitor and the second power frequency filter capacitor form a low-pass filter which can filter out higher harmonics; the first field effect tube and the second field effect tube realize high-frequency inversion of electric energy; the two primary side resonance networks are respectively formed by connecting a primary side compensation capacitor and a transmitting coil; due to the coupling effect of the magnetic field, the two transmitting coils transmit electric energy to the receiving coil together; the secondary side resonance network is formed by connecting a receiving coil, a secondary side first compensation capacitor, a secondary side second compensation capacitor, an inductor and a single-pole double-throw relay for switching the compensation network according to a circuit principle; the high-frequency rectifier bridge converts alternating current into direct current and charges a storage battery; the primary side auxiliary power supply, the primary side single chip circuit, the primary side wireless communication circuit and the primary side driving circuit form a primary side control circuit together; the primary side driving circuit is respectively connected with the grid electrodes of the first field effect tube and the second field effect tube, and the primary side single chip microcomputer circuit is respectively connected with the primary side driving circuit, the primary side auxiliary power supply and the primary side wireless communication circuit; the primary side auxiliary power supply supplies power to the primary side wireless communication circuit, the primary side single chip microcomputer control circuit, the primary side driving circuit and the primary side single chip microcomputer control circuit; the primary side single chip microcomputer control circuit outputs driving signals of the first field effect transistor and the second field effect transistor according to communication signals received by the primary side wireless communication circuit, and the driving signals enter the primary side driving circuit to be amplified; the secondary control circuit comprises a voltage sampling circuit, a current sampling circuit, a secondary single chip circuit, a secondary auxiliary power supply, a secondary wireless communication circuit and a secondary driving circuit; the voltage sampling circuit and the current sampling circuit are connected with the anode of the storage battery, and the output voltage and the output current of the main circuit are detected; the secondary side single chip microcomputer circuit is respectively connected with the voltage sampling circuit, the current sampling circuit, the secondary side auxiliary power supply, the secondary side driving circuit and the secondary side wireless communication circuit; the voltage sampling circuit, the current sampling circuit, the secondary side driving circuit, the secondary side single chip circuit and the secondary side wireless communication circuit are all powered by a secondary side auxiliary power supply; and transmitting the received voltage and current signals of the sampling circuit to the secondary single chip microcomputer circuit, and then controlling the secondary wireless communication circuit to transmit a feedback signal to the primary wireless communication circuit.
The specific process for realizing the single-tube inversion inductive coupling electric energy transmission comprises the following steps:
(1) starting an alternating current power supply to supply power to a main circuit, starting a primary auxiliary power supply to respectively supply power to a primary single chip circuit, a primary wireless communication circuit and a primary driving circuit, and starting a secondary auxiliary power supply to respectively supply power to a secondary wireless communication circuit, a secondary driving circuit, a voltage sampling circuit and a current sampling circuit;
(2) when the main circuit reaches a stable working state, the storage battery starts to be charged, the first stage of charging is constant-current charging, the voltage sampling circuit and the current sampling circuit work simultaneously, the acquired signal is subjected to AD conversion by the secondary side single-chip microcomputer circuit, when the acquired voltage signal is judged to be lower than a preset value, the secondary side single-chip microcomputer circuit judges and then works in a current sampling mode, no driving signal is sent to the secondary side driving circuit, for the single-pole double-throw relay of which the secondary side is used for switching a compensation network, the relay is provided with a normally open contact and a normally closed contact, and the switching between the normally open contact and the normally closed contact in the single-pole double-throw relay is controlled by controlling whether a coil in the relay is electrified or not; when the single-pole double-throw relay is in a normally closed contact, the circuit works in a constant current mode, the output current of the circuit is constantly equal to the current value of constant current charging at the moment, and the constant current charging is carried out on the storage battery; the secondary singlechip circuit transmits data to the secondary wireless communication circuit to enable the secondary singlechip circuit to be in wireless communication with the primary wireless communication circuit;
(3) along with the constant-current charging, at the moment when the voltages at two ends of the storage battery reach a preset value, the voltage value at the moment is collected by a voltage sampling circuit, after the voltage is processed by a secondary-side single-chip microcomputer control circuit, a driving signal is sent to a secondary-side driving circuit, a relay is switched to a normally open contact at the moment, the circuit works in a constant-voltage mode, the output voltage of the circuit is constantly equal to the voltage value of constant-voltage charging, the storage battery is subjected to constant-voltage charging, and the preset voltage value is smaller than the voltage value of the constant-voltage charging; meanwhile, the secondary singlechip circuit transmits data to the secondary wireless communication circuit to enable the secondary wireless communication circuit to carry out wireless communication with the primary wireless communication circuit;
(4) with the constant voltage charging, when the current flowing through the storage battery is detected to be reduced to be smaller than a preset minimum limit, the primary side driving circuit and the secondary side driving circuit stop sending pulse signals after the processing of the secondary side single chip circuit, the secondary side wireless communication circuit, the primary side wireless communication circuit and the primary side single chip circuit, so that the charging is finished, otherwise, the constant voltage output is continued.
Compared with the existing charging device and method, the invention has the advantages of simple control and low switching loss, and the structure with double input and single output can realize the transmission of larger power, reduce the voltage born by a single switch tube and simultaneously realize the requirement of constant-current and constant-voltage charging of the storage battery.
Description of the drawings:
fig. 1 is a schematic diagram of a main structure circuit of the single-tube inverter inductive coupling power transmission device according to the present invention.
FIG. 2 is a schematic diagram of a compensation network of the single-tube inversion inductive coupling power transmission device of the present invention, which can realize constant current and constant voltage by only changing the switching frequency without switching the compensation topology, wherein when charging at constant current, the single-chip microcomputer outputs PWM frequency of fCCWhen constant voltage charging, the singlechip outputs PWM frequency of fCVThe topology can enable the circuit to realize constant current and constant voltage output only by changing the switching frequency.
FIG. 3 is a schematic diagram of a BP coil structure for realizing mutual decoupling by partial overlapping shared by two transmitting coils, according to the invention, decoupling between two transmitting coils on the primary side can be realized by adopting the BP coil, wherein the left coil represents a first transmitting coil Lp1And the right coil represents the second transmitting coil Lp2。
Fig. 4 is a schematic diagram of voltage and current waveforms of a single-tube inverter constant-current and constant-voltage output by a double-input and single-output structure realized by a secondary-side switching compensation network according to the present invention. Wherein IBFor the value of the current flowing through the accumulator during charging, IccCurrent value for constant current charging, UBFor charging the voltage value, U, across the accumulatorcvVoltage value for constant voltage charging, UccFor presetting the voltage across the accumulator during the constant-current-constant-voltage mode conversion, IminIs the set value of the current flowing through the battery at the end of charging.
Fig. 5 is a schematic diagram of a working process of the single-tube inversion inductive coupling electric energy transmission device for realizing constant-current-constant-voltage working mode conversion through a secondary side switching compensation network.
The specific implementation mode is as follows:
the technical solution of the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example (b):
the main structure of the single-tube inversion inductive coupling electric energy transmission device comprises a power frequency rectifier bridge 1, a power frequency filter capacitor 2, a primary side resonance network 3 and a first field effect tube Q1A second field effect transistor Q2The secondary side resonant network 4, the high-frequency rectifier bridge 5, the high-frequency filter capacitor 6, the storage battery 7, the primary side control circuit 8 and the secondary side control circuit 9; an AC power supply is connected to the input end of a power frequency rectifier bridge 1, and a power frequency filter capacitor 2 is composed of a first power frequency filter capacitor Cin1And a second power frequency filter capacitor Cin2The low-pass filter is connected in series and used for filtering higher harmonics and averaging the input voltage; the primary side resonant network 3 consists of a primary side first resonant network and a primary side second resonant network, and the primary side first resonant network consists of a primary side first compensation capacitor Cp1And a first radiation coil Lp1Connecting to form; the primary side second resonant network is composed of a primary side second compensation capacitor Cp2And a second transmitting coil Lp2Connected by a magnetic field coupling effect, the transmitting coil Lp1And a transmitting coil Lp2Jointly transmit electrical energy to the receiving coil Ls(ii) a The secondary resonant network 4 is formed by a secondary resonant network and a receiving coil LsA secondary side first compensation capacitor Cs1And a secondary side second compensation capacitor Cs2Inductor L1And a single-pole double-throw relay S for mode switching, which is connected according to the electrical principle; output positive terminal of power frequency rectifier bridge 1 and first power frequency filter capacitor Cin1The anode of the first power frequency filter capacitor is connected with the input end a end of the primary side first resonant network, and the second power frequency filter capacitor Cin2The anode of the first power frequency filter capacitor is connected with the input end C end of the primary side second resonant networkin1Negative pole and second power frequency filter capacitor Cin2The positive electrodes of the two electrodes are connected; output negative terminal of power frequency rectifier bridge 1 and second power frequency filter capacitor Cin2Negative electrode of (1), second field effect transistor Q2Respectively connected with the ground wire of the primary side, the output end b end of the primary side first resonance network and the first field effect transistor Q1Is connected to the drain of the first field effect transistor Q1Source electrode and first power frequency filter capacitor Cin1Is connected to the negative electrode ofThe output end d of the side second resonant network and the working field effect tube Q2The drain electrodes of the first and second transistors are connected; the secondary side resonance network 4 is cascaded with the high-frequency rectifier bridge 5, the output positive end of the high-frequency rectifier bridge 5 and the positive electrode of the high-frequency filter capacitor 6 are connected with the positive electrode of the storage battery 7, and the output negative end of the high-frequency rectifier bridge 5 and the negative electrode of the high-frequency filter capacitor 6 are connected with the negative electrode of the storage battery 7; the high-frequency rectifier bridge 5 converts alternating current into direct current, and the direct current is filtered and then charged into a storage battery 7; the primary side control circuit 8 comprises a primary side auxiliary power supply 10, a primary side wireless communication circuit 11, a primary side single chip microcomputer circuit 12 and a primary side driving circuit 13; the primary side driving circuit 13 is respectively connected with the first field effect transistor Q1And a second field effect transistor Q2The primary side single chip circuit 12 is respectively connected with the primary side auxiliary power supply 10, the primary side wireless communication circuit 11 and the primary side drive circuit 13; the primary side auxiliary power supply 10 supplies power to the primary side wireless communication circuit 11, the primary side driving circuit 13 and the primary side single chip microcomputer control circuit 12; the primary side singlechip control circuit 12 outputs a first field effect transistor Q according to the communication signal received by the primary side wireless communication circuit 111And a second field effect Q2Then the driving signal enters the primary side driving circuit 13 to be amplified; the secondary control circuit 9 comprises a secondary auxiliary power supply 14, a secondary driving circuit 15, a secondary single-chip circuit 16, a secondary wireless communication circuit 17, a voltage sampling circuit 18 and a current sampling circuit 19; the voltage sampling circuit 18 and the current sampling circuit 19 are connected with the anode of the storage battery 7 and used for detecting the output voltage and the output current of the main circuit; the secondary single chip microcomputer circuit 16 is respectively connected with a secondary auxiliary power supply 14, a secondary driving circuit 15, a secondary wireless communication circuit 17, a voltage sampling circuit 18 and a current sampling circuit 19; the auxiliary power supply 14 is used for supplying power for connecting an auxiliary single chip circuit 16, an auxiliary wireless communication circuit 17, a voltage sampling circuit 18 and a current sampling circuit 19; the secondary side single chip circuit 16 controls the secondary side wireless communication circuit 17 to transmit a feedback signal to the primary side wireless communication circuit 11 according to the received voltage and current signals of the sampling circuit; the power frequency alternating current is rectified by a power frequency rectifier bridge 1 and filtered by a power frequency filter capacitor 2 in sequence to change the power frequency alternating current into direct current, and a first field effect tube Q1And a second field effectTube Q2Respectively inverting the direct current into high-frequency alternating current to realize high-frequency inversion of electric energy in respective resonant networks; high-frequency alternating current is applied to two ends of a transmitting coil of the primary side resonance network 3, current is induced to two ends of a receiving coil of the secondary side resonance network 4, the induced current is changed into required direct current through the secondary side resonance network 4 and the high-frequency rectifier bridge 5, and the direct current is finally supplied to a storage battery 7 through a high-frequency filter capacitor 6 for charging.
The specific process for realizing the single-tube inversion inductive coupling electric energy transmission comprises the following steps:
(1) starting an alternating current power supply AC to supply power to a main circuit, starting a primary auxiliary power supply 10 to respectively supply power to a primary wireless communication circuit 11, a primary single-chip microcomputer circuit 12 and a primary driving circuit 13, and starting a secondary auxiliary power supply 14 to respectively supply power to a secondary driving circuit 15, a secondary wireless communication circuit 17, a voltage sampling circuit 18 and a current sampling circuit 19;
(2) when the main circuit reaches a stable working state, the storage battery 7 starts to be charged, the first stage of charging is constant current charging, the voltage sampling circuit 18 and the current sampling circuit 19 work simultaneously, the secondary singlechip circuit 16 carries out AD conversion on the collected signals, and when the collected voltage signals u are judgedoIs lower than a preset value urefWhen the single-pole double-throw relay is judged by the secondary single-chip microcomputer circuit 16 and works in a current sampling mode, no driving signal is sent to the secondary driving circuit, and the normally closed contact of the single-pole double-throw relay S and the first compensation capacitor C of the secondary sides1Connected, the circuit works in a Constant Current (CC) mode and outputs a current IBIs constantly equal to IccCharging the storage battery 7 with constant current; meanwhile, the secondary singlechip circuit 16 transmits data to the secondary wireless communication circuit 17, so that the secondary wireless communication circuit wirelessly communicates with the primary wireless communication circuit 11;
(3) when the voltage at the two ends of the storage battery 7 reaches the output voltage value U of the constant voltage modeccAt the moment, the voltage value is collected by the voltage sampling circuit 18, the secondary singlechip control circuit 16 judges and processes the voltage value and sends out a driving signal, the driving signal is transmitted to the relay through the driving circuit, and the single-pole double-throw relay S and the secondary side second compensation electricity at the momentContainer Cs2Connected, the circuit operates in Constant Voltage (CV) mode, and the circuit outputs a voltage UBIs constantly equal to UcvConstant voltage charging is carried out on the storage battery; meanwhile, the secondary singlechip circuit 16 transmits data to the secondary wireless communication circuit 17, so that the secondary wireless communication circuit wirelessly communicates with the primary wireless communication circuit 11;
(4) during the constant-voltage charging phase, when it is detected that the current flowing through the accumulator 7 has dropped below a predetermined limit IminDuring charging, after the processing of the secondary singlechip circuit 16, the secondary wireless communication circuit 17, the primary wireless communication circuit 11 and the primary singlechip circuit 12, the primary driving circuit 13 and the secondary driving circuit 15 stop sending PWM pulse signals, so that charging is finished, otherwise, constant voltage output is continued.
Claims (2)
1. A single-tube inversion inductive coupling electric energy transmission device is characterized in that the main structure of the device comprises a power frequency rectifier bridge, a first power frequency filter capacitor, a second power frequency filter capacitor, a primary side first resonant network, a primary side second resonant network, a switching tube, a secondary side resonant network, a high-frequency rectifier circuit, a high-frequency filter capacitor, a storage battery, a primary side control circuit and a secondary side control circuit; an alternating current power supply is connected with an input end of a power frequency rectifier bridge, an anode output end and a cathode output end of the power frequency rectifier bridge are respectively connected with an anode of a first power frequency filter capacitor and a cathode of a second power frequency filter capacitor, a cathode of the first power frequency filter capacitor is connected with an anode of the second power frequency filter capacitor, an anode of the first power frequency filter capacitor is connected with an input end of a primary side first resonant network, an anode of the second power frequency filter capacitor is connected with an input end of a primary side second resonant network, a cathode output end of the power frequency rectifier bridge, a cathode of the second power frequency filter capacitor and a source electrode of a second field effect tube in the primary side second resonant network are respectively connected with a ground wire of the primary side, a first transmitting coil in the primary side first resonant network and a second transmitting coil in the second resonant network share a BP coil, and the BP coil is composed of two identical, partially overlapped and mutually decoupled coils, the output ends of the primary side first resonant network and the primary side second resonant network are respectively connected with the drains of the corresponding first field effect transistor and the second field effect transistor; the secondary side resonance network is cascaded with the high-frequency rectifier bridge, wherein the positive electrode output end of the high-frequency rectifier bridge and the negative electrode of the high-frequency filter capacitor are connected with the positive electrode of the storage battery, the negative electrode output end of the high-frequency rectifier bridge and the negative electrode of the high-frequency filter capacitor are connected with the negative electrode of the storage battery, power frequency alternating current is converted into direct current after passing through the power frequency rectifier bridge and the power frequency filter capacitor, and then the direct current is reversely converted into high-frequency alternating current by the first field effect tube and the second field effect tube; high-frequency alternating current is respectively applied to two ends of a transmitting coil of the primary side first resonant network and two ends of a transmitting coil of the secondary side resonant network, current is induced at two ends of a receiving coil of the secondary side resonant network, the current is changed into required direct current after passing through the secondary side resonant network and the high-frequency rectifying circuit, and finally, a storage battery can be charged; the power frequency rectifier bridge rectifies power frequency alternating current; the first power frequency filter capacitor and the second power frequency filter capacitor form a low-pass filter which can filter out higher harmonics; the first field effect tube and the second field effect tube realize high-frequency inversion of electric energy; the two primary side resonance networks are respectively formed by connecting a primary side compensation capacitor and a transmitting coil; due to the coupling effect of the magnetic field, the two transmitting coils transmit electric energy to the receiving coil together; the secondary side resonance network is formed by connecting a receiving coil, a secondary side first compensation capacitor, a secondary side second compensation capacitor, an inductor and a single-pole double-throw relay for switching the compensation network according to a circuit principle; the high-frequency rectifier bridge converts alternating current into direct current and charges a storage battery; the primary side auxiliary power supply, the primary side single chip circuit, the primary side wireless communication circuit and the primary side driving circuit form a primary side control circuit together; the primary side driving circuit is respectively connected with the grid electrodes of the first field effect tube and the second field effect tube, and the primary side single chip microcomputer circuit is respectively connected with the primary side driving circuit, the primary side auxiliary power supply and the primary side wireless communication circuit; the primary side auxiliary power supply supplies power to the primary side wireless communication circuit, the primary side single chip microcomputer control circuit, the primary side driving circuit and the primary side single chip microcomputer control circuit; the primary side single chip microcomputer control circuit outputs driving signals of the first field effect transistor and the second field effect transistor according to communication signals received by the primary side wireless communication circuit, and the driving signals enter the primary side driving circuit to be amplified; the secondary control circuit comprises a voltage sampling circuit, a current sampling circuit, a secondary single chip circuit, a secondary auxiliary power supply, a secondary wireless communication circuit and a secondary driving circuit; the voltage sampling circuit and the current sampling circuit are connected with the anode of the storage battery, and the output voltage and the output current of the main circuit are detected; the secondary side single chip microcomputer circuit is respectively connected with the voltage sampling circuit, the current sampling circuit, the secondary side auxiliary power supply, the secondary side driving circuit and the secondary side wireless communication circuit; the voltage sampling circuit, the current sampling circuit, the secondary side driving circuit, the secondary side single chip circuit and the secondary side wireless communication circuit are all powered by a secondary side auxiliary power supply; and transmitting the received voltage and current signals of the sampling circuit to the secondary single chip microcomputer circuit, and then controlling the secondary wireless communication circuit to transmit a feedback signal to the primary wireless communication circuit.
2. A method for implementing single-tube inverter inductive coupling power transmission by using the device of claim 1, which comprises the following steps:
(1) starting an alternating current power supply to supply power to a main circuit, starting a primary auxiliary power supply to respectively supply power to a primary single chip circuit, a primary wireless communication circuit and a primary driving circuit, and starting a secondary auxiliary power supply to respectively supply power to a secondary wireless communication circuit, a secondary driving circuit, a voltage sampling circuit and a current sampling circuit;
(2) when the main circuit reaches a stable working state, the storage battery starts to be charged, the first stage of charging is constant-current charging, the voltage sampling circuit and the current sampling circuit work simultaneously, the acquired signal is subjected to AD conversion by the secondary side single-chip microcomputer circuit, when the acquired voltage signal is judged to be lower than a preset value, the secondary side single-chip microcomputer circuit judges and then works in a current sampling mode, no driving signal is sent to the secondary side driving circuit, for the single-pole double-throw relay of which the secondary side is used for switching a compensation network, the relay is provided with a normally open contact and a normally closed contact, and the switching between the normally open contact and the normally closed contact in the single-pole double-throw relay is controlled by controlling whether a coil in the relay is electrified or not; when the single-pole double-throw relay is in a normally closed contact, the circuit works in a constant current mode, the output current of the circuit is constantly equal to the current value of constant current charging at the moment, and the constant current charging is carried out on the storage battery; the secondary singlechip circuit transmits data to the secondary wireless communication circuit to enable the secondary singlechip circuit to be in wireless communication with the primary wireless communication circuit;
(3) along with the constant-current charging, at the moment when the voltages at two ends of the storage battery reach a preset value, the voltage value at the moment is collected by a voltage sampling circuit, after the voltage is processed by a secondary-side single-chip microcomputer control circuit, a driving signal is sent to a secondary-side driving circuit, a relay is switched to a normally open contact at the moment, the circuit works in a constant-voltage mode, the output voltage of the circuit is constantly equal to the voltage value of constant-voltage charging, the storage battery is subjected to constant-voltage charging, and the preset voltage value is smaller than the voltage value of the constant-voltage charging; meanwhile, the secondary singlechip circuit transmits data to the secondary wireless communication circuit to enable the secondary wireless communication circuit to carry out wireless communication with the primary wireless communication circuit;
(4) with the constant voltage charging, when the current flowing through the storage battery is detected to be reduced to be smaller than a preset minimum limit, the primary side driving circuit and the secondary side driving circuit stop sending pulse signals after the processing of the secondary side single chip circuit, the secondary side wireless communication circuit, the primary side wireless communication circuit and the primary side single chip circuit, so that the charging is finished, otherwise, the constant voltage output is continued.
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