CN107994686B - Multi-load inductive coupling power transmission device - Google Patents
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- CN107994686B CN107994686B CN201710310157.8A CN201710310157A CN107994686B CN 107994686 B CN107994686 B CN 107994686B CN 201710310157 A CN201710310157 A CN 201710310157A CN 107994686 B CN107994686 B CN 107994686B
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- H02J5/005—
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- H02J7/025—
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- 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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- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/49—Combination of the output voltage waveforms of a plurality of converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The invention discloses a multi-load inductive coupling electric energy transmission device which comprises a constant current chopping unit and a high-frequency inversion unit, wherein the high-frequency inversion unit comprises at least two single-phase current type multi-level inversion circuits, and the constant current chopping unit obtains approximate constant current in a primary coil loop so as to eliminate the influence of load change on the resonant current of the primary loop. The high-frequency inversion link adopts a single-phase current type multi-level inversion circuit, more multi-level output current can be obtained on the basis of the through-current of a conventional power device, and the waveform of the inversion current is closer to sine while the current stress of a switching device is reduced. The multi-level current waveform modulated by the power transmitting end control unit has lower waveform distortion, and is beneficial to reducing the electromagnetic field exciting coil loss and the electromagnetic interference to the environment. Therefore, the stability and reliability of the system operation can be maintained during multi-load switching.
Description
Technical Field
The invention relates to the technical field of power transmission, in particular to a multi-load inductive coupling power transmission device.
Background
The wireless power transmission is a technology for power transmission through space electromagnetic field coupling, and has the main advantages that plugging and unplugging are not needed, and the wireless power transmission is simple and convenient to use; the electric spark is not generated, and the electric spark plug can be used in flammable and explosive industrial environments; the energy transmission device can be used for energy transmission in water and can also be applied to underwater applications such as marine equipment. The transmitting end and the wireless power receiving end of the wireless power transmission system transfer energy through a magnetic field, and a wire is not needed to be connected between the transmitting end and the wireless power receiving end.
The basic working principle of the inductive coupling power transmission system is as follows: the power frequency alternating current power supply is changed into high-frequency alternating current through a rectifying and filtering link and a high-frequency inversion link, the high-frequency alternating current transmits electromagnetic energy to the outside through a primary side coil, a secondary side coil in the energy receiving device converts magnetic field energy converted by the power supply side into electric energy again under the action of an electromagnetic induction coupling principle, and the electric energy is converted into an electric energy form which can be directly used by a system load through a system circuit device.
At present, relatively deep research and analysis have been carried out on relevant theories, design methods, control problems and practical applications of a single-load inductive coupling power transmission technology. However, when faced with multi-load power supply applications, it is necessary to rebuild the multi-load inductively coupled power transfer system. As shown in fig. 1, the magnetoelectric integrated system with multiple parameters restricted with each other is more complex in design than a single-load inductive coupling power transmission system, so that only a partial reference or a single-load inductive coupling power transmission technology can be used. In a multi-load inductive coupling power transmission system, a key technical problem is that load changes can affect the resonant current of a transmitting coil loop of the system. In a multi-load inductive coupling power transmission system, a key technical problem is that load changes can affect the resonant current of a transmitting coil loop of the system. During the steady-state operation of the multi-load inductive coupling power transmission system, when one or more loads stop operating (or change), the reflected impedance of the power receiving coil loop reflected to the system transmitting coil loop inevitably changes, so that the high-frequency sinusoidal resonant current of the transmitting coil changes. Therefore, if a conventional three-phase inverter circuit is adopted in the high-frequency inverter link, the stability and reliability of the system work are influenced during multi-load switching.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a multi-load inductive coupling power transmission apparatus, which can maintain the stability and reliability of system operation during multi-load switching.
The technical scheme of the invention is that a multi-load inductive coupling electric energy transmission device with the following structure is provided, which comprises a rectifying unit, a constant current chopping unit, a high-frequency inversion unit and a power transmitting end control unit; the rectifying unit is connected with the constant current chopping unit; the high-frequency inverter unit comprises at least two single-phase current type multi-level inverter circuits; the single-phase current type multi-level inverter circuit is connected in series and then connected to two ends of the constant current chopping unit; each single-phase current type multi-level inverter circuit is connected with the primary side coil of the corresponding coupling coil; the secondary coil of each coupling coil is connected with the high-frequency rectifying circuit; each high-frequency rectifying circuit is used for being connected with a load; the power transmitting end control unit is used for driving the single-phase current type multi-level inverter circuit to work.
After adopting the structure, compared with the prior art, the multi-load inductive coupling electric energy transmission device has the following advantages:
the multi-load inductive coupling electric energy transmission device comprises a constant current chopping unit and a high-frequency inversion unit, wherein the high-frequency inversion unit comprises at least two single-phase current type multi-level inversion circuits, and the constant current chopping unit obtains approximate constant current in a primary coil loop so as to eliminate the influence of load change on the resonant current of the primary loop. The high-frequency inversion link adopts a single-phase current type multi-level inversion circuit, more multi-level output current can be obtained on the basis of the through-current of a conventional power device, and the waveform of the inversion current is closer to sine while the current stress of a switching device is reduced. The multi-level current waveform modulated by the power transmitting end control unit has lower waveform distortion, and is beneficial to reducing the electromagnetic field exciting coil loss and the electromagnetic interference to the environment. Therefore, the stability and reliability of the system operation can be maintained during multi-load switching.
As an improvement, the single-phase current type multi-level inverter circuit is a single-phase current type five-level inverter circuit. After adopting this kind of structure, the design is more reasonable.
As an improvement, the single-phase current type five-level inverter circuit comprises a shunt inductor and eight switching circuits; one end of the first switch circuit, one end of the fourth switch circuit and one end of the shunt inductor are connected with one end of the smoothing inductor; the other end of the shunt inductor is connected with one end of the second switch circuit and one end of the third switch circuit; the other end of the first switch circuit and the other end of the second switch open circuit are both connected with one end of the compensation capacitor; the other end of the third switch circuit and the other end of the fourth switch circuit are both connected with the other end of the compensation capacitor; one end of the fifth switch circuit is connected with the other end of the first switch circuit, one end of the sixth switch circuit is connected with the other end of the second switch circuit, one end of the seventh switch circuit is connected with the other end of the third switch circuit, and one end of the eighth switch circuit is connected with the other end of the fourth switch circuit; the other end of the fifth switch circuit, the other end of the sixth switch circuit, the other end of the seventh switch circuit and the other end of the eighth switch circuit are all connected with the rectifying circuit. After the structure is adopted, the single-phase current type multi-level inverter circuit adopts the single-phase current type five-level inverter circuit and adopts the five-level PWM modulation technology, so that the input current is in a five-level PWM waveform, the harmonic content is low, and the waveform is closer to sine.
As an improvement, the switching circuit comprises a diode and a triode, and the cathode of the diode is connected with the collector of the triode; the anode of the diode is one end of the switch circuit, and the emitter of the triode is the other end of the switch circuit. After adopting this kind of structure, circuit structure is simpler.
As an improvement, a first compensation capacitor is connected in parallel between two ends of a primary coil of the coupling coil. The first compensation capacitor is used for constructing a primary coil parallel resonance compensation network.
As an improvement, a second compensation capacitor is connected in parallel between two ends of the secondary coil of the coupling coil. The first compensation capacitor is used for constructing a secondary coil parallel resonance compensation network.
As an improvement, the constant current chopping unit comprises a first switching tube, a smoothing inductor, a second diode and a constant current control circuit; the collector of the first switching tube is connected with the cathode of the rectifying circuit; the emitter of the first switch tube is connected with one end of the flat wave inductor, and the other end of the flat wave inductor is connected with one end of the single-phase current type multi-level inverter circuit; the anode of the second diode is connected with the anode of the rectifying circuit, and the cathode of the second diode is connected with the cathode of the rectifying circuit; the constant current control circuit is used for driving the first switch tube to work. After adopting this kind of structure, simple structure, the effect of eliminating the influence of load change to primary circuit resonant current is better.
As an improvement, the constant current control circuit comprises a PI controller and a waveform modulation circuit; the total current of the direct current side is collected and compared with the direct current set value, and then the total current is sent to a PI controller, and a PWM pulse signal is generated through the waveform modulation circuit to adjust the first switch tube so as to realize constant current control. After adopting this kind of structure, constant current control circuit simple structure, and control is convenient.
As an improvement, the power transmitting end control unit comprises a square wave shaping circuit, a digital signal processor and a programmable logic unit; the square wave shaping circuit is used for shaping a sinusoidal voltage current signal of a primary coil of the coupling coil into a square wave signal, sending the square wave signal to the digital signal processor for phase-locked control, and sending the square wave signal to the programmable logic unit for phase discrimination; the digital signal processor is used for acquiring voltage and current signals of a primary coil side of the coupling coil and calculating transmitting power; receiving a power signal of a secondary side coil side of the coupling coil, and calculating the power which is actually transmitted by the primary side coil according to the power signal; obtaining a sinusoidal reference signal according to the power which is actually transmitted by the primary coil, wherein the frequency and the phase of the sinusoidal reference signal are realized by a phase-locked control algorithm; transmitting the sinusoidal reference signal to a programmable logic unit; the programmable logic unit receives the sinusoidal reference signal and generates a PD-PWM signal; and (3) recombining and distributing the PD-PWM signals by combining the current-sharing control of the single-phase current type multi-level inverter circuit, and controlling the single-phase current type multi-level inverter circuit to work after driving and amplifying. By adopting the structure, the power transmitting end control unit realizes output current waveform PD-PWM modulation and simultaneously maintains the balance control of DC side shunt inductor current.
Drawings
Fig. 1 is a circuit schematic of a multi-load inductively coupled power transfer device of the present invention.
Fig. 2 is a schematic structural diagram of a constant current control circuit of the multi-load inductive coupling power transmission device according to the present invention.
Fig. 3 is a schematic structural diagram of a power transmitting terminal control unit of the multi-load inductive coupling power transmission apparatus according to the present invention.
Fig. 4 shows the current waveforms of the primary and secondary coils when the three groups of loads are completely consistent.
FIG. 5 shows the current waveforms of the primary and secondary windings when the three loads are all different.
Shown in the figure: 1. the high-frequency rectification circuit comprises a rectification unit, 2 a constant-current chopper circuit, 3 a high-frequency inversion unit, 4 a first compensation capacitor, 5 a coupling coil, 6 a second compensation capacitor, 7 and a high-frequency rectification circuit.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1, the multi-load inductive coupling power transmission device of the present invention includes a rectifying unit 1, a constant current chopping unit 2, a high frequency inverter unit 3, and a power transmitting end control unit; the rectifying unit 1 is connected with the constant current chopping unit 2; the high-frequency inverter unit 3 comprises at least two single-phase current type multi-level inverter circuits; the single-phase current type multi-level inverter circuit is connected in series and then connected to two ends of the constant current chopping unit 2; each single-phase current type multi-level inverter circuit is connected with the primary side coil of the corresponding coupling coil 5; the secondary coil of each coupling coil 5 is connected with a high-frequency rectifying circuit 7; each high-frequency rectifying circuit 7 is used for connecting with a load; the power transmitting end control unit is used for driving the single-phase current type multi-level inverter circuit to work. In this embodiment, the single-phase current type multi-level inverter circuit is a single-phase current type five-level inverter circuit. And a first compensation capacitor 4 is connected in parallel between two ends of the primary coil of the coupling coil 5. And a second compensation capacitor 6 is connected in parallel between two ends of the secondary coil of the coupling coil 5.
The single-phase current type five-level inverter circuit comprises a shunt inductor and eight switching circuits; one end of the first switch circuit, one end of the fourth switch circuit and one end of the shunt inductor are connected with one end of the smoothing inductor; the other end of the shunt inductor is connected with one end of the second switch circuit and one end of the third switch circuit; the other end of the first switch circuit and the other end of the second switch open circuit are both connected with one end of the compensation capacitor; the other end of the third switch circuit and the other end of the fourth switch circuit are both connected with the other end of the compensation capacitor; one end of the fifth switch circuit is connected with the other end of the first switch circuit, one end of the sixth switch circuit is connected with the other end of the second switch circuit, one end of the seventh switch circuit is connected with the other end of the third switch circuit, and one end of the eighth switch circuit is connected with the other end of the fourth switch circuit; the other end of the fifth switch circuit, the other end of the sixth switch circuit, the other end of the seventh switch circuit and the other end of the eighth switch circuit are all connected with the rectifying circuit.
The switching circuit comprises a first diode and a triode, and the cathode of the first diode is connected with the collector of the triode; the anode of the first diode is one end of the switch circuit, and the emitter of the triode is the other end of the switch circuit.
Referring to fig. 2, the constant current chopping unit includes a first switching tube, a smoothing inductor, a second diode, and a constant current control circuit; the collector electrode of the first switching tube is connected with the cathode of the rectifying circuit; the emitter of the first switch tube is connected with one end of the flat wave inductor, and the other end of the flat wave inductor is connected with one end of the single-phase current type multi-level inverter circuit; the anode of the second diode is connected with the anode of the rectifying circuit, and the cathode of the second diode is connected with the cathode of the rectifying circuit; and the PWM signal generated by the constant current control circuit is used for driving the first switching tube to work. The constant current control circuit comprises a PI controller and a waveform modulation circuit; the total current of the direct current side is collected and compared with the direct current set value, and then the total current is sent to a PI controller, and a PWM pulse signal is generated after the total current passes through the waveform modulation circuit to control the first switching tube so as to realize constant current control.
Referring to fig. 3, the power transmitting end control unit includes a square wave shaping circuit, a digital signal processor, and a programmable logic unit; the square wave shaping circuit is used for shaping a sinusoidal voltage current signal of a primary coil of the coupling coil into a square wave signal, sending the square wave signal to the digital signal processor for phase-locked control, and sending the square wave signal to the programmable logic unit for phase discrimination; the digital signal processor is used for acquiring voltage and current signals of a primary coil side of the coupling coil and calculating transmitting power; receiving a power signal of a secondary side coil side of the coupling coil, and calculating the power which is actually transmitted by the primary side coil according to the power signal; obtaining a sinusoidal reference signal according to the power which is actually transmitted by the primary coil, wherein the frequency and the phase of the sinusoidal reference signal are realized by a phase-locked control algorithm; transmitting the sinusoidal reference signal to a programmable logic unit; the programmable logic unit receives the sinusoidal reference signal and generates a PD-PWM signal; and (3) recombining and distributing the PD-PWM signals by combining the current sharing control of the single-phase current type multi-level inverter circuit, and controlling the single-phase current type multi-level inverter circuit to work after driving and amplifying.
The working principle of the multi-load inductive coupling electric energy transmission device is as follows: the rectification side adopts a mode of diode rectification and inductive filtering, and the power factor of the network side can be improved by avoiding using an electrolytic capacitor and an additional PFC circuit. In order to eliminate the influence of multi-load switching on the resonant current of the primary circuit, a constant-current chopper circuit is inserted at the rear stage of the rectifying circuit, as shown in 2 in fig. 1. The constant current control implementation method is shown in fig. 2, and the system collects the total current i at the direct current side in real time L Is related to a given value of DC current I d_set After comparison, the signals are sent to a PI controller and pass through a waveform modulation circuit to generate PWM pulse signals to adjust a switching tube VT 1 To achieve constant current control.
The control circuit on the power transmitting side of the multi-load ICPT system is mainly composed of 3 parts, namely a DSP, a CPLD and a square wave shaping circuit, as shown in FIG. 3.
Sinusoidal voltage and current signals of the primary winding are converted into square wave signals through a square wave shaping circuit, and the square wave signals are respectively sent to the DSP and the CPLD and used for phase-locked control and phase identification. The DSP is mainly responsible for calculating the power actually transmitted by the primary coil in real time and is realized by adjusting the amplitude of a sinusoidal reference signal of the single-phase five-level current type inverter, and the frequency and the phase of the sinusoidal reference signal are realized by a phase-locked control algorithm. The CPLD is mainly responsible for generating 8 paths of PD-PWM signals and is used for driving and controlling 8 switching tubes of the single-phase five-level current type inverter, so that high-frequency low-harmonic sine current output is realized. Therefore, multi-load wireless power supply can be realized by connecting a plurality of single-phase current type five-level units in series in a primary side loop and configuring the same number of receiving coils on a secondary side.
The invention takes three groups of loads as an example, and carries out comparative analysis:
case 1: the three groups of loads are completely consistent, so that the current waveforms of the three primary coils are completely overlapped, the current waveforms of the three secondary coils are also completely overlapped, and the waveforms are shown in fig. 4.
Case 2: the three groups of loads are all different, which shows that the three groups of loads are distributed asymmetrically. It can be seen that the current waveforms of the secondary three coils are very different, which indicates that the secondary coil absorbs power of a corresponding magnitude according to the magnitude of the actual load. In this case, the current waveforms of the three primary coils do not completely coincide but have small differences in amplitude. This shows that the circuit proposed by the present invention can overcome the influence of the secondary load variation on the primary coil current, and the waveform is shown in fig. 5.
Claims (7)
1. A multi-load inductively coupled power transfer device, comprising: the device comprises a rectifying unit, a constant-current chopping unit, a high-frequency inversion unit and a power transmitting end control unit; the rectifying unit is connected with the constant current chopping unit; the high-frequency inverter unit comprises at least two single-phase current type multi-level inverter circuits; the single-phase current type multi-level inverter circuit is connected in series and then connected to two ends of the constant current chopping unit; each single-phase current type multi-level inverter circuit is connected with the primary side coil of the corresponding coupling coil; the secondary coil of each coupling coil is connected with the high-frequency rectifying circuit; each high-frequency rectifying circuit is used for being connected with a load; each power transmitting end control unit is used for receiving a power signal of the secondary side coil side of each corresponding coupling coil and calculating the power which is actually transmitted by the corresponding primary side coil according to the received power signal; the power transmitting end control unit obtains a sinusoidal reference signal according to the power which is actually transmitted by the primary coil, and drives the corresponding single-phase current type multilevel inverter circuit to output the sinusoidal reference signal;
the single-phase current type multi-level inverter circuit is a single-phase current type five-level inverter circuit, and the single-phase current type five-level inverter circuit comprises a shunt inductor and eight switch circuits;
the power transmitting end control unit comprises a square wave shaping circuit, a digital signal processor and a programmable logic unit;
the square wave shaping circuit is used for shaping a sinusoidal voltage current signal of a primary coil of the coupling coil into a square wave signal, sending the square wave signal to the digital signal processor for phase-locked control, and sending the square wave signal to the programmable logic unit for phase discrimination;
the digital signal processor is used for acquiring voltage and current signals of a primary coil side of the coupling coil and calculating transmitting power; receiving a power signal of a secondary side coil side of the coupling coil, and calculating the power which is actually transmitted by the primary side coil according to the power signal; obtaining a sinusoidal reference signal according to the power which is actually transmitted by the primary coil, wherein the frequency and the phase of the sinusoidal reference signal are realized by a phase-locked control algorithm; transmitting the sinusoidal reference signal to a programmable logic unit;
the programmable logic unit receives the sine reference signal and generates 8 paths of PD-PWM signals; and combining the current sharing control of the single-phase current type five-level inverter circuit, recombining and distributing 8 paths of PD-PWM signals, and respectively driving and controlling 8 switching circuits in the single-phase five-level current type inverter circuit after driving and amplifying so as to output high-frequency low-harmonic sine current.
2. A multi-load inductively coupled power transfer device as claimed in claim 1 wherein: one end of the first switch circuit, one end of the fourth switch circuit and one end of the shunt inductor are connected with one end of the smoothing inductor; the other end of the shunt inductor is connected with one end of the second switch circuit and one end of the third switch circuit; the other end of the first switch circuit and the other end of the second switch open circuit are both connected with one end of the compensation capacitor; the other end of the third switch circuit and the other end of the fourth switch circuit are both connected with the other end of the compensation capacitor; one end of the fifth switch circuit is connected with the other end of the first switch circuit, one end of the sixth switch circuit is connected with the other end of the second switch circuit, one end of the seventh switch circuit is connected with the other end of the third switch circuit, and one end of the eighth switch circuit is connected with the other end of the fourth switch circuit; the other end of the fifth switch circuit, the other end of the sixth switch circuit, the other end of the seventh switch circuit and the other end of the eighth switch circuit are all connected with the high-frequency rectification circuit.
3. A multi-load inductively coupled power transfer device as claimed in claim 2 wherein: the switching circuit comprises a first diode and a triode, and the cathode of the first diode is connected with the collector of the triode; the anode of the first diode is one end of the switch circuit, and the emitter of the triode is the other end of the switch circuit.
4. A multi-load inductively coupled power transfer device as claimed in claim 1 wherein: and a first compensation capacitor is connected in parallel between two ends of a primary coil of the coupling coil.
5. A multi-load inductively coupled power transfer device as claimed in claim 1 or 4 wherein: and a second compensation capacitor is connected in parallel between two ends of the secondary coil of the coupling coil.
6. A multi-load inductively coupled power transfer device as claimed in claim 1 wherein: the constant current chopping unit comprises a first switching tube, a smoothing inductor, a second diode and a constant current control circuit; the collector of the first switching tube is connected with the cathode of the rectifying circuit; the emitter of the first switch tube is connected with one end of the flat wave inductor, and the other end of the flat wave inductor is connected with one end of the single-phase current type multi-level inverter circuit; the anode of the second diode is connected with the anode of the rectifying circuit, and the cathode of the second diode is connected with the cathode of the rectifying circuit; the constant current control circuit is used for driving the first switch tube to work.
7. The multi-load inductively coupled power transfer device of claim 6 wherein: the constant current control circuit comprises a PI controller and a waveform modulation circuit; the method comprises the steps of collecting total current of a direct current side, comparing the total current with a direct current set value, sending the total current to a PI controller, and generating a PWM pulse signal through a waveform modulation circuit to adjust a first switching tube to achieve constant current control.
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