CN112436615A - Magnetic integrated coupling parallel single-tube wireless electric energy transmission device and constant voltage control method thereof - Google Patents
Magnetic integrated coupling parallel single-tube wireless electric energy transmission device and constant voltage control method thereof Download PDFInfo
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- CN112436615A CN112436615A CN202011389395.0A CN202011389395A CN112436615A CN 112436615 A CN112436615 A CN 112436615A CN 202011389395 A CN202011389395 A CN 202011389395A CN 112436615 A CN112436615 A CN 112436615A
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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
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or 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
- 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
Abstract
The invention belongs to the technical field of electricity, and is based on a magnetic integration coupling parallel type single-tube wireless electric energy transmission device and a constant voltage control method thereof1C1After filtering by the filter circuit, converting power frequency alternating current into direct current, and inverting the direct current into high-frequency alternating current by the switching tube; high-frequency alternating current is applied to two ends of the primary transmitting coil after passing through the primary resonant network, current is induced at two ends of the secondary receiving coil, and the induced current is changed into direct current after sequentially passing through the secondary resonant network, the high-frequency rectifier bridge and the high-frequency filter capacitor to supply power to a load; the control is simple, the switching loss is low,the circuit has the advantages of simple structure, low cost, high efficiency, capability of meeting the requirement of constant-voltage power supply of the load and practical application value.
Description
The technical field is as follows:
the invention belongs to the technical field of electricity, and discloses a magnetic integrated coupling parallel type single-tube wireless electric energy transmission device and a constant voltage control method thereof.
Background art:
in recent years, the demand for a high-Power Wireless Power Transfer (WPT) system is increasing, but the demand is limited by the loss and voltage stress of a switching device, in order to improve the Power level of the system, the Wireless Power Transfer is performed by adopting a method of connecting a plurality of inverters in parallel, which becomes a hot point, but the parallel connection of the inverters introduces a circulating current problem; in order to solve the problem of circulation, decoupling coils on the same side by using a magnetic integrated coupling mode becomes a new research direction; the magnetic integrated coil structure is designed, and the influence of the circular current caused by the parallel connection of inverters is eliminated in a mode of decoupling the coils on the same side through the magnetic integrated coupling; most of the parallel inverter circuits adopted at present mostly adopt a half-bridge or full-bridge structure to transmit wireless electric energy, and relevant documents based on the wireless electric energy transmission of the parallel single-tube inverter circuits are not found. The parallel single-tube inverter circuit adopts two sets of inverter circuits with single switching tubes, is simpler to control than a half-bridge inverter circuit, has high reliability, does not have the problem of direct connection of bridge arms, eliminates the circulating current influence caused by parallel connection of inverters based on the decoupling effect of magnetic integrated coupling on coils on the same side, and has higher power grade and smaller voltage stress of the switching tubes than the single-tube inverter circuit. Therefore, the single-tube circuit-based constant-voltage output parallel wireless electric energy transmission device suitable for three kilowatts and below is designed, has a simple circuit structure, low cost and high reliability, and has a very high practical value.
The invention content is as follows:
the invention aims to overcome the defects of the prior art, break through the difficulties that the current single-tube wireless electric energy transmission power level is low, the voltage stress of a switch tube is large and the wireless electric energy transmission device generates a circular current after being connected in parallel, and provides a magnetic integration coupling parallel single-tube wireless electric energy transmission device and a constant voltage control method thereof.
In order to achieve the purpose, the main structure of the magnetic integration coupling type parallel single-tube wireless electric energy transmission device comprises a power frequency rectifier bridge and an L1C1Filter circuit formed by connecting first primary side transmitting coil and first primary side capacitorThe device comprises a first primary side resonance network, a first switching tube, a first secondary side resonance network formed by connecting a first secondary side receiving coil, a first secondary side capacitor and a first secondary side inductor according to an electrical principle, a first high-frequency rectifier bridge, a first high-frequency filter capacitor, a second primary side resonance network formed by connecting a second primary side transmitting coil and a second primary side capacitor, a second switching tube, a second secondary side resonance network formed by connecting a second secondary side receiving coil, a second secondary side capacitor and a second secondary side inductor according to the electrical principle, a second high-frequency rectifier bridge, a second high-frequency filter capacitor, a primary side control circuit, a secondary side control circuit and a load; l is1C1The filter circuit is a low-pass filter formed by connecting a first inductor and a first capacitor and used for filtering higher harmonics; the input end of the power frequency rectifier bridge is connected with an alternating current power supply, and the output end of the power frequency rectifier bridge is connected with the L1C1The input end of the filter circuit is connected; l is1C1The output end of the filter circuit is respectively connected with the first primary side resonance network and the second primary side resonance network, the source electrode of the first switching tube is connected with the first primary side resonance network, and the source electrode of the second switching tube is connected with the second primary side resonance network; the first primary side resonance network, the first secondary side resonance network, the first high-frequency rectifier bridge and the first high-frequency filter capacitor are sequentially connected, the second primary side resonance network, the second secondary side resonance network, the second high-frequency rectifier bridge and the second high-frequency filter capacitor are sequentially connected, the load is respectively connected with the first high-frequency filter capacitor and the second high-frequency filter capacitor, and the first high-frequency filter capacitor and the second high-frequency filter capacitor are used for filtering higher harmonics and providing direct current with small ripples for the load; 220V power frequency alternating current provided by an alternating current power supply is rectified by a power frequency rectifier bridge and L1C1After filtering by the filter circuit, converting power frequency alternating current into direct current, and inverting the direct current into high-frequency alternating current by the first switching tube and the second switching tube; high-frequency alternating current is applied to two ends of the first primary side transmitting coil and two ends of the second primary side transmitting coil through the first primary side resonant network and the second primary side resonant network respectively, currents are induced at two ends of the first secondary side receiving coil and two ends of the second secondary side receiving coil, and the currents induced at two ends of the first secondary side receiving coil sequentially pass through the first secondary side resonant network, the first high-frequency rectifier bridge and the first high-frequency rectifier bridgeThe frequency filter capacitor is changed into direct current, and the current induced at the two ends of the second secondary side receiving coil sequentially passes through the second secondary side resonant network, the second high-frequency rectifier bridge and the second high-frequency filter capacitor to be changed into direct current so as to supply power to the load; the primary side control circuit comprises a voltage detection circuit, a primary side auxiliary power supply, a primary side single chip microcomputer control circuit, a driving circuit and a primary side wireless communication circuit; the secondary side of the driving circuit is connected with the grids of the first switching tube and the second switching tube; the primary side auxiliary power supply is connected with an alternating current power supply; the voltage detection circuit is respectively connected with the drive circuit and the drain electrodes of the first switching tube and the second switching tube; the primary side single chip microcomputer control circuit is respectively connected with the voltage detection circuit, the primary side auxiliary power supply, the driving circuit and the primary side wireless communication circuit; the primary side auxiliary power supply supplies power for the voltage detection circuit, the primary side single chip microcomputer control circuit, the driving circuit and the primary side wireless communication circuit; the primary side single chip microcomputer control circuit outputs driving signals of the first switching tube and the second switching tube according to communication signals received by the primary side wireless communication circuit, the driving signals enter the driving circuit to be amplified, and the two switching tubes are simultaneously switched on and off; the voltage detection circuit is used for detecting the voltages at two ends of the first switching tube and the voltage of the driving circuit, sending signals to the primary-side single-chip microcomputer control circuit, displaying the voltages on the first switching tube and the driving circuit and judging whether zero-voltage switching-on is realized or not, and when the voltage of the driving circuit is zero, detecting the voltage of the first switching tube to ensure that the first switching tube realizes zero-voltage switching-on; the secondary control circuit comprises a secondary wireless communication circuit, a secondary single-chip microcomputer control circuit, a sampling circuit and a secondary auxiliary power supply; the sampling circuit is connected with the positive pole of the load and is used for detecting the output voltage of the load; the secondary side single chip microcomputer control circuit is respectively connected with the secondary side wireless communication circuit, the secondary side auxiliary power supply and the sampling circuit; the secondary side auxiliary power supply supplies power to the secondary side wireless communication circuit, the secondary side single chip microcomputer control circuit and the sampling circuit; and the secondary singlechip control circuit controls the secondary wireless communication circuit to transmit a feedback signal to the primary wireless communication circuit according to the received voltage and current signals of the sampling circuit.
The first primary side transmitting coil and the second primary side transmitting coil are decoupled and do not influence each other; decoupling between the first secondary side receiving coil and the second secondary side receiving coil is not influenced mutually; the decoupling process between the coils on the same side is as follows: the first primary side transmitting coil and the second primary side transmitting coil are integrated together, so that mutual inductance between the two transmitting coils is zero, and decoupling is realized; the first secondary receiving coil and the first primary transmitting coil are identical in structure, the second secondary receiving coil and the second primary transmitting coil are identical in structure, and the first secondary receiving coil and the second secondary receiving coil are integrated together, so that mutual inductance between the two receiving coils is zero, and decoupling is realized; and the first primary side transmitting coil only generates inductive coupling effect on the first secondary side receiving coil, and the second primary side transmitting coil only generates inductive coupling effect on the second secondary side receiving coil.
The constant voltage control process for realizing the magnetic integration coupling parallel single-tube wireless electric energy transmission device 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 microcomputer control circuit, a voltage detection circuit, a driving circuit and a primary wireless communication circuit, and starting a secondary auxiliary power supply to respectively supply power to a sampling circuit, a secondary single-chip microcomputer control circuit and a secondary wireless communication circuit;
(2) the voltage detection circuit detects the voltage of the first switching tube and the voltage of the driving signal, when the primary single-chip microcomputer control circuit detects the signal of the voltage detection circuit, two identical driving signals are transmitted to the driving circuit, and the driving circuit simultaneously turns on or simultaneously turns off the two switching tubes;
(3) when the main circuit reaches a stable working state, the sampling circuit works, the sampling circuit collects voltage values at two ends of a load, the voltage values are processed by the secondary singlechip control circuit, and data are transmitted to the secondary wireless communication circuit to be wirelessly communicated with the primary wireless communication circuit; when the primary-side single-chip microcomputer control circuit detects a signal from the primary-side wireless communication circuit, the primary-side single-chip microcomputer control circuit adjusts and finely adjusts the duty ratio and the frequency of an output driving signal, so that the voltage applied to two ends of a load is stabilized at a preset value.
Compared with the existing parallel bridge inverter, the parallel bridge inverter has the advantages of simple control, low switching loss, simple circuit structure, low cost and high efficiency, can meet the requirement of constant-voltage power supply of a load, and has practical application value.
Description of the drawings:
fig. 1 is a schematic diagram of a main structure circuit of the magnetic integrated coupling parallel single-tube wireless power transmission device according to the present invention.
FIG. 2 is a coil structure used in the present invention, wherein coil (a) is a square coil having an average side length D; the coil (b) is a coil formed by winding four squares with the average side length of D/2; coil (a) as a first primary transmission coil Lp1And a first secondary receiving coil Ls1(ii) a Coil (b) as a second primary transmission coil Lp2And a second minor edge receiving coil Ls2(ii) a The integrated coil (c) is a coil in which the coil (a) and the coil (b) are integrated.
FIG. 3 is a schematic diagram of the working flow of the method for controlling two switching tubes according to the present invention, wherein the driving signals of the two switches are the same, and only the control method of the first switching tube is shown, wherein UBIs a sampled voltage value, U, across the loadGFor voltage sample values of the drive signal, UQIs the sampled voltage value, f, across the first switching tubesIs the resonant frequency of the system, foFor switching on the operating frequency of the first switching tube, UrefIn order to be the set reference value for the reference value,
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 magnetic integrated coupling parallel single-tube wireless electric energy transmission device comprises a power frequency rectifier bridge 1 and an L1C1The filter circuit 2 is composed of a first primary side transmitting coil Lp1And a first primary side capacitor Cp1First primary side resonant network 3 and first switching tube Q formed by connection1A first secondary side receives the winding coil Ls1A first secondary capacitor Cs1And a first secondary inductance L2First secondary resonant net formed by connection according to electrical principleA network 4, a first high-frequency rectifier bridge 5, a first high-frequency filter capacitor 6, a second primary side transmitting coil Lp2And a second primary capacitor Cp2Second primary side resonant network 7 and second switching tube Q formed by connection2A second auxiliary edge receives the winding coil Ls2And a second secondary side capacitor Cs2And a second secondary inductance L3A second secondary resonant network 8, a second high-frequency rectifier bridge 9, a second high-frequency filter capacitor 10, a primary side control circuit 11, a secondary side control circuit 12 and a load which are formed according to the electrical principle; l is1C1The filter circuit 2 is composed of a first inductor L1And a first capacitor C1A low-pass filter is connected to filter out higher harmonics; the input end of the power frequency rectifier bridge 1 is connected with an alternating current power supply, and the output end is connected with L1C1The input end of the filter circuit 2 is connected; l is1C1The output end of the filter circuit 2 is respectively connected with the first primary side resonance network 3 and the second primary side resonance network 7, and the first switching tube Q1Is connected with the first primary side resonance network 3, and a second switching tube Q2The source of which is connected to a second primary resonant network 7; the first primary side resonance network 3, the first secondary side resonance network 4, the first high-frequency rectifier bridge 5 and the first high-frequency filter capacitor 6 are sequentially connected, the second primary side resonance network 7, the second secondary side resonance network 8, the second high-frequency rectifier bridge 9 and the second high-frequency filter capacitor 10 are sequentially connected, and the load is respectively connected with the first high-frequency filter capacitor 6 and the second high-frequency filter capacitor 10; 220V AC power supplyacSequentially rectified by a power frequency rectifier bridge 1 and L1C1After being filtered by the filter circuit 2, the power frequency alternating current is converted into direct current, and the first switching tube Q1And a second switching tube Q2Inverting the direct current into high-frequency alternating current; high-frequency alternating current is applied to the first primary side transmitting coil L through the first primary side resonant network 3 and the second primary side resonant network 7 respectivelyp1And a second primary side generating coil Lp2Two ends of the wire receiving ring L are connected with a first auxiliary edges1And a second minor edge receiving coil Ls2A first secondary receiving coil L with currents induced at both endss1The current induced at the two ends sequentially passes through the first secondary side resonant network 4, the first high-frequency rectifier bridge 5 and the first high frequencyThe filter capacitor 6 is changed into direct current, and the second secondary side is connected with a winding coil Ls2The currents induced at the two ends sequentially pass through the second secondary side resonant network 8, the second high-frequency rectifier bridge 9 and the second high-frequency filter capacitor 10 to be converted into direct currents, and power is supplied to a load; the primary side control circuit 11 comprises a voltage detection circuit 13, a primary side auxiliary power supply 14, a primary side single chip microcomputer control circuit 15, a driving circuit 16 and a primary side wireless communication circuit 17; the secondary side of the driving circuit 16 and the first switch tube Q1And a second switching tube Q2The grid electrodes are connected; the primary side auxiliary power supply 14 is connected with a power supply; the voltage detection circuit 13 is respectively connected with the driving circuit and the first switch tube Q1And a second switching tube Q2The drain electrodes of the two electrodes are connected; the primary-side single-chip microcomputer control circuit 15 is respectively connected with the voltage detection circuit 13, the primary-side auxiliary power supply 14, the driving circuit 16 and the primary-side wireless communication circuit 17; the primary side auxiliary power supply 13 supplies power to the voltage detection circuit 13, the primary side single chip microcomputer control circuit 15, the driving circuit 16 and the primary side wireless communication circuit 17; the primary-side singlechip control circuit 15 outputs a first switching tube Q according to the communication signal received by the primary-side wireless communication circuit 151And a second switching tube Q2The driving signal enters the driving circuit 16 for amplification; the voltage detection circuit 13 is used for detecting the first switch tube Q1The voltage of the two ends of the drain source and the driving circuit, and sends the signal to the primary-side singlechip control circuit 15 to display the voltage of the first switching tube Q1And the voltage on the driving circuit 16 and whether zero voltage switching-on is realized or not are judged, and when the driving voltage is zero, the voltage of the switching tube is detected to ensure that the first switching tube Q is connected1Realizing zero voltage switching-on; the secondary control circuit 12 comprises a secondary wireless communication circuit 18, a secondary single-chip microcomputer control circuit 19, a sampling circuit 20 and a secondary auxiliary power supply 21; the sampling circuit 20 is connected with the positive pole of the load and detects the output voltage of the load; the secondary singlechip control circuit 19 is respectively connected with the secondary wireless communication circuit 18, the secondary auxiliary power supply 21 and the sampling circuit 20; the auxiliary power supply 21 supplies power to the auxiliary wireless communication circuit 18, the auxiliary single-chip microcomputer control circuit 19 and the sampling circuit 20; the secondary singlechip control circuit 19 controls the secondary wireless communication circuit 18 to the primary wireless communication circuit 1 according to the received voltage and current signal of the sampling circuit 207 transmit a feedback signal.
In this embodiment, the first primary resonant network 3 and the second primary resonant network 7 compensate the first primary transmitting coil L respectivelyp1And a second primary transmission coil Lp2Reactive circulating current of (a); the first primary side transmitting coil L is due to the magnetic field coupling effectp1And a second primary transmission coil Lp2Transmitting electric energy to a first secondary receiving coil Ls1And a second minor edge receiving coil Ls2(ii) a The first secondary resonant network 4 and the second secondary resonant network 8 compensate the first secondary receiving coil L, respectivelys1And a second minor edge receiving coil Ls2Reactive circulating current of (a).
The process of implementing the constant voltage control in this embodiment specifically includes the following steps:
(1) starting an alternating current power supply to supply power to a main circuit, starting a primary auxiliary power supply 14 to supply power to a voltage detection circuit 13, a primary single-chip microcomputer control circuit 15, a driving circuit 16 and a primary wireless communication circuit 17 respectively, and starting a secondary auxiliary power supply 21 to supply power to a secondary wireless communication circuit 18, a secondary single-chip microcomputer control circuit 19 and a sampling circuit 20 respectively;
(2) the sampling circuit 20 collects the voltage value U across the loadBThe voltage detection circuit 13 detects the driving voltage signal UGAnd a first switching tube Q1Voltage U acrossQ(ii) a When the first switch tube Q1Operating frequency foIs less than the resonant frequency f of the first primary side resonant network 3sWhile the voltage value U of the two ends of the load is adjustedBAnd a set reference value UrefComparing if the voltage value U across the load isBLess than a set reference value UrefSimultaneously increasing the operating frequency f of two switching tubeso(ii) a If the voltage value U is sampledBGreater than a set reference value UrefReducing the operating frequency f of two switching tubes simultaneouslyo(ii) a When the first switch tube Q1Operating frequency foGreater than the resonant frequency f of the first primary resonant network 3sWhile, the voltage value U at the two ends of the loadBAnd a set reference value UrefComparing if the voltage value U across the load isBLess than a set reference value UrefWhile decreasingOperating frequency f of two switching tubeso(ii) a If the voltage value U across the load isBGreater than a set reference value UrefWhile adding the first switch tube Q1And a second switching tube Q2Operating frequency fo(ii) a When the driving voltage signal U detected by the voltage detection circuit 13GWhen the voltage is equal to 0, the first switch tube Q is conducted1Voltage U ofQWhen the first switch tube Q is judged1Voltage U ofQWhen the duty ratio is not equal to 0, the duty ratios of the two switching tubes are simultaneously and greatly increased; when the first switch Q1Voltage U of the tubeQWhen the voltage is equal to 0, the duty ratio of the two switching tubes is increased slightly at the same time until the voltage U of the switching tubesQAnd when the frequency is larger than 0 again, returning to readjust the working frequency of the two switching tubes.
Claims (3)
1. A magnetic integrated coupling parallel single-tube wireless electric energy transmission device is characterized in that the main structure of the device comprises a power frequency rectifier bridge and an L-shaped single-tube wireless electric energy transmission device1C1The high-frequency filter circuit comprises a filter circuit, a first primary side resonance network formed by connecting a first primary side transmitting coil and a first primary side capacitor, a first switch tube, a first secondary side resonance network formed by connecting a first secondary side receiving coil, a first secondary side capacitor and a first secondary side inductor according to an electrical principle, a first high-frequency rectifier bridge, a first high-frequency filter capacitor, a second primary side resonance network formed by connecting a second primary side transmitting coil and a second primary side capacitor, a second switch tube, a second secondary side resonance network formed by connecting a second secondary side receiving coil, a second secondary side capacitor and a second secondary side inductor according to the electrical principle, a second high-frequency rectifier bridge, a second high-frequency filter capacitor, a primary side control circuit, a secondary side control circuit and a load; l is1C1The filter circuit is a low-pass filter formed by connecting a first inductor and a first capacitor and used for filtering higher harmonics; the input end of the power frequency rectifier bridge is connected with an alternating current power supply, and the output end of the power frequency rectifier bridge is connected with the L1C1The input end of the filter circuit is connected; l is1C1The output end of the filter circuit is respectively connected with the first primary side resonance network and the second primary side resonance network, the source electrode of the first switch tube is connected with the first primary side resonance network, and the second switchThe source electrode of the tube is connected with the second primary side resonant network; the first primary side resonance network, the first secondary side resonance network, the first high-frequency rectifier bridge and the first high-frequency filter capacitor are sequentially connected, the second primary side resonance network, the second secondary side resonance network, the second high-frequency rectifier bridge and the second high-frequency filter capacitor are sequentially connected, the load is respectively connected with the first high-frequency filter capacitor and the second high-frequency filter capacitor, and the first high-frequency filter capacitor and the second high-frequency filter capacitor are used for filtering higher harmonics and providing direct current with small ripples for the load; 220V power frequency alternating current provided by an alternating current power supply is rectified by a power frequency rectifier bridge and L1C1After filtering by the filter circuit, converting power frequency alternating current into direct current, and inverting the direct current into high-frequency alternating current by the first switching tube and the second switching tube; high-frequency alternating current is applied to two ends of a first primary side transmitting coil and a second primary side transmitting coil respectively through a first primary side resonance network and a second primary side resonance network, currents are induced at two ends of a first secondary side receiving coil and a second secondary side receiving coil, the currents induced at two ends of the first secondary side receiving coil are changed into direct current through the first secondary side resonance network, a first high-frequency rectifier bridge and a first high-frequency filter capacitor in sequence, and the currents induced at two ends of the second secondary side receiving coil are changed into direct current through the second secondary side resonance network, a second high-frequency rectifier bridge and a second high-frequency filter capacitor in sequence to supply power to a load; the primary side control circuit comprises a voltage detection circuit, a primary side auxiliary power supply, a primary side single chip microcomputer control circuit, a driving circuit and a primary side wireless communication circuit; the secondary side of the driving circuit is connected with the grids of the first switching tube and the second switching tube; the primary side auxiliary power supply is connected with an alternating current power supply; the voltage detection circuit is respectively connected with the drive circuit and the drain electrodes of the first switching tube and the second switching tube; the primary side single chip microcomputer control circuit is respectively connected with the voltage detection circuit, the primary side auxiliary power supply, the driving circuit and the primary side wireless communication circuit; the primary side auxiliary power supply supplies power for the voltage detection circuit, the primary side single chip microcomputer control circuit, the driving circuit and the primary side wireless communication circuit; the primary side single chip microcomputer control circuit outputs driving signals of the first switching tube and the second switching tube according to communication signals received by the primary side wireless communication circuit, the driving signals enter the driving circuit to be amplified, and the two driving signals are amplifiedThe switch tubes are simultaneously switched on and off; the voltage detection circuit is used for detecting the voltages at two ends of the first switching tube and the voltage of the driving circuit, sending signals to the primary-side single-chip microcomputer control circuit, displaying the voltages on the first switching tube and the driving circuit and judging whether zero-voltage switching-on is realized or not, and when the voltage of the driving circuit is zero, detecting the voltage of the first switching tube to ensure that the first switching tube realizes zero-voltage switching-on; the secondary control circuit comprises a secondary wireless communication circuit, a secondary single-chip microcomputer control circuit, a sampling circuit and a secondary auxiliary power supply; the sampling circuit is connected with the positive pole of the load and is used for detecting the output voltage of the load; the secondary side single chip microcomputer control circuit is respectively connected with the secondary side wireless communication circuit, the secondary side auxiliary power supply and the sampling circuit; the secondary side auxiliary power supply supplies power to the secondary side wireless communication circuit, the secondary side single chip microcomputer control circuit and the sampling circuit; and the secondary singlechip control circuit controls the secondary wireless communication circuit to transmit a feedback signal to the primary wireless communication circuit according to the received voltage and current signals of the sampling circuit.
2. The magnetic integrated coupling parallel type single-tube wireless power transmission device according to claim 1, wherein decoupling between the first primary side transmitting coil and the second primary side transmitting coil does not affect each other; decoupling between the first secondary side receiving coil and the second secondary side receiving coil is not influenced mutually; the decoupling process between the coils on the same side is as follows: the first primary side transmitting coil and the second primary side transmitting coil are integrated together, so that mutual inductance between the two transmitting coils is zero, and decoupling is realized; the first secondary receiving coil and the first primary transmitting coil are identical in structure, the second secondary receiving coil and the second primary transmitting coil are identical in structure, and the first secondary receiving coil and the second secondary receiving coil are integrated together, so that mutual inductance between the two receiving coils is zero, and decoupling is realized; and the first primary side transmitting coil only generates inductive coupling effect on the first secondary side receiving coil, and the second primary side transmitting coil only generates inductive coupling effect on the second secondary side receiving coil.
3. The constant pressure control method of the device according to claim 2, comprising the steps of:
(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 microcomputer control circuit, a voltage detection circuit, a driving circuit and a primary wireless communication circuit, and starting a secondary auxiliary power supply to respectively supply power to a sampling circuit, a secondary single-chip microcomputer control circuit and a secondary wireless communication circuit;
(2) the voltage detection circuit detects the voltage of the first switching tube and the voltage of the driving signal, when the primary single-chip microcomputer control circuit detects the signal of the voltage detection circuit, two identical driving signals are transmitted to the driving circuit, and the driving circuit simultaneously turns on or simultaneously turns off the two switching tubes;
(3) when the main circuit reaches a stable working state, the sampling circuit works, the sampling circuit collects voltage values at two ends of a load, the voltage values are processed by the secondary singlechip control circuit, and data are transmitted to the secondary wireless communication circuit to be wirelessly communicated with the primary wireless communication circuit; when the primary-side single-chip microcomputer control circuit detects a signal from the primary-side wireless communication circuit, the primary-side single-chip microcomputer control circuit adjusts and finely adjusts the duty ratio and the frequency of an output driving signal, so that the voltage applied to two ends of a load is stabilized at a preset value.
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| CN110386008A (en) * | 2019-06-27 | 2019-10-29 | 中国电力科学研究院有限公司 | A kind of electric car wireless charging method and system based on double transmitting-bis- pickup modes |
| CN110544975A (en) * | 2019-09-27 | 2019-12-06 | 青岛大学 | single-tube constant-current constant-voltage wireless charging device and control method thereof |
| CN110808641A (en) * | 2019-11-01 | 2020-02-18 | 南京航空航天大学 | Wireless power transmission topology with strong anti-migration performance based on multi-frequency energy parallel transmission |
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