CN112564308A - Double-frequency compensation and power decoupling control system for double-load WPT system - Google Patents
Double-frequency compensation and power decoupling control system for double-load WPT system Download PDFInfo
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- CN112564308A CN112564308A CN202011376772.7A CN202011376772A CN112564308A CN 112564308 A CN112564308 A CN 112564308A CN 202011376772 A CN202011376772 A CN 202011376772A CN 112564308 A CN112564308 A CN 112564308A
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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
- H02J50/402—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
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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
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
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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
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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
- H02M3/285—Single converters with a plurality of output stages connected in parallel
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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
- 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
- H02M3/33576—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 having at least one active switching element at the secondary side of an isolation transformer
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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
-
- 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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Inverter Devices (AREA)
Abstract
The invention relates to a double-frequency compensation and power decoupling control system for a double-load WPT system. The invention relates to the technical field of wireless power transmission, wherein a direct current power supply provides power for the whole system, a first DC/DC conversion circuit realizes the adjustment of direct current bus voltage at the input side of a full-bridge inverter circuit, the full-bridge inverter circuit converts direct current into high-frequency alternating current for a transmitting coil, and a double-frequency compensation network allows the current of two frequency components at the output end of the full-bridge inverter circuit to pass through and supply the current to the transmitting coil. The two receiving coils respectively receive the energy of the two frequency components to realize decoupling output. The invention provides a double-frequency compensation network with randomly set frequency and a parameter design method thereof, which can realize the hardware constant current of two frequency components of emission current and reduce the design difficulty of an inversion source. Meanwhile, a power decoupling control method of two frequency components is provided, and the output power of two loads can be adjusted simultaneously.
Description
Technical Field
The invention relates to the technical field of wireless power transmission, in particular to a double-frequency compensation and power decoupling control system for a double-load WPT system.
Background
The wireless electric energy transmission technology can realize non-contact and full-isolation electric energy supply, and has higher reliability, stronger environmental adaptability and more convenient human-computer interaction compared with wired power supply, thereby being widely valued and researched. The technology is applied to the fields of mobile communication equipment, household appliances, biological medical treatment, electric automobiles, rail transit and the like.
Technologies such as a coupling mechanism design, a compensation network characteristic, a power control method, and the like of a WPT (wireless power transfer) system at a single receiving end are relatively mature. However, in practical applications, there are cases where one transmitting coil simultaneously powers a plurality of receiving terminals. The multi-receiving-end system has two outstanding problems: firstly, due to the limitation of space and position, cross coupling exists between two receiving coils with a close distance, and both output power and system efficiency are affected; secondly, when a plurality of loads work simultaneously, decoupling control of the power of each receiving end needs to be realized.
In order to decouple the receiving coil and improve the system performance, the decoupling can be realized by designing an orthogonal magnetic circuit, but the structural decoupling is often limited due to the influence of the space and the size of a receiving end. The purpose of maximum output power or maximum system efficiency can be achieved by matching the optimal resonant frequency or the optimal working load of the system, but the optimal frequency is usually deviated from the natural resonant frequency point, so that the reactive power of the system is increased. In addition, the power of a plurality of loads can be decoupled and controlled by using the frequency bifurcation phenomenon, the resonant frequencies of different receiving ends are arranged at different bifurcation points, and the output power is realized by adjusting the working frequency. However, this method does not reach the maximum coupling capability between each receiving end and each transmitting end, and belongs to an optimal solution considering the trade-off in a practical sense.
The multi-frequency wireless power transmission technology provides a new solution for decoupling control of the receiving ends, different resonant frequencies are configured for the multiple receiving ends, decoupling on power is achieved by superposing current components of various frequencies in the transmitting current, the problem of output power reduction caused by cross coupling of the receiving ends is solved, and system efficiency is improved. There are currently two implementations: the first method utilizes fundamental wave and odd harmonic of resonant frequency to transmit energy, however, the resonant frequency of each receiving end cannot be set at will; the second type provides the emission current component of a plurality of frequencies through the mode that a plurality of contravariant sources are established ties or are coupled, has the advantage that the frequency is set wantonly, but contravariant source structure is complicated, and the cost is higher, and the control degree of difficulty is big.
How to simplify the structure of the inverter source and the power decoupling control method on the premise that the resonant frequency is set at will still needs further research.
Disclosure of Invention
In order to reduce the volume of the motor, improve the response speed of the system and simultaneously improve the integration level and the reliability of the system, the invention provides the following technical scheme:
a dual-frequency compensation and power decoupling control system for a dual-load WPT system comprises a transmitting end, a first receiving end and a second receiving end;
the transmitting end comprises a direct current power supply, a first DC/DC conversion circuit, a full-bridge inverter circuit, a double-frequency compensation network and a transmitting coil;
the direct current power supply is connected with a first DC/DC conversion circuit, the first DC/DC conversion circuit is connected with a full-bridge inverter circuit, the full-bridge inverter circuit is connected with a double-frequency compensation network, and the double-frequency compensation network is connected with a transmitting coil.
Preferably, the first receiving end includes a first receiving coil, a first series compensation circuit, a first high-frequency rectification circuit, a second DC/DC conversion circuit, and a first load;
the first receiving coil and the transmitting coil are mutually inductive, the first receiving coil is connected with a first series compensation circuit, the first series compensation circuit is connected with a first high-frequency rectifying circuit, the first high-frequency rectifying circuit is connected with a second DC/DC conversion circuit, and the second DC/DC conversion circuit is connected with a first load.
Preferably, the second receiving end includes a second receiving coil, a second series compensation circuit, a second high-frequency rectification circuit, a third DC/DC conversion circuit, and a second load;
the second receiving coil and the transmitting coil are mutually inductive, the second receiving coil is connected with a second series compensation circuit, the second series compensation circuit is connected with a second high-frequency rectifying circuit, the second high-frequency rectifying circuit is connected with a third DC/DC conversion circuit, and the third DC/DC conversion circuit is connected with a second load.
Preferably, the dual frequency compensation network comprises a capacitor Cf1Capacitor Cf2Inductor L1And an inductance Lf(ii) a The capacitor Cf1One end is connected with an inductor L1Output current of terminal, said capacitor Cf1The other end is connected with an inductor LfOne end of the inductor LfThe other end is connected with a capacitor Cf2One end of the capacitor Cf2The other end outputs the current of the transmitting coil.
Preferably, the dual-frequency compensation network comprises two resonant frequencies, one of which is the lowest resonant frequency ωLOne is the highest resonance frequency ωHω is expressed by the following equation corresponding to the resonance frequencies of the first receiving terminal and the second receiving terminal, respectivelyLAnd ωH：
Wherein L is1Is a series resonant inductor, LfIs a parallel resonant inductor, CfIs a capacitor Cf1And a capacitor Cf2The value of (a).
Preferably, the full-bridge inverter circuit comprises a power switch tube T1Power switch tube T2Power switch tube T3Power switch tube T4Antiparallel diode D1Antiparallel diode D2Antiparallel diode D3And an anti-parallel diode D4；
The power switch tube T3And power switch tube T1One end of the power switch tube is connected to the positive electrode of an adjustable direct current input voltage source, and the power switch tube T4And power switch tube T2One end of the power switch tube T is connected to the negative electrode of an adjustable direct current input voltage source1The other end is connected with a power switch tube T2The other end, the power switch tube T3The other end is connected with a power switch tube T4The other end, the anti-parallel diode D1Antiparallel diode D2Antiparallel diode D3And an anti-parallel diode D4Are respectively connected in parallel to the power switch tube T1Power switch tube T2Power switch tube T3And power switch tube T4The above.
Preferably, the double-frequency compensation and power decoupling control system of the double-load WPT system is modulated by an SPWM method, a modulation ratio M is determined, and the modulation ratio M is represented by the following formula:
wherein M issFor modulating the amplitude of the wave, McIs the carrier amplitude.
Preferably, the independent adjustment of the two frequency components of the emission current is realized by adjusting the values of the direct-current bus voltage and the modulation ratio M, and the effective values of the two frequency components of the emission current are expressed by the following formula:
wherein E isdIs a DC bus voltage, omega1And ω2Operating frequencies, J, of two main components of the emission current, respectively0Is a Bessel function.
The invention has the following beneficial effects:
the invention provides a double-frequency compensation network with randomly set frequency, which can realize the hardware constant current of two frequency components of emission current and reduce the design difficulty of an inverter source.
The invention provides power decoupling control of two frequency components based on an SPWM (sinusoidal pulse width modulation) method, and can realize simultaneous adjustment of output power of two loads. The invention provides a double-frequency compensation network parameter design method, which provides reference and guidance for practical application
Drawings
Figure 1 is a schematic diagram of a dual frequency compensation and power decoupling control system for a dual load WPT system;
FIG. 2 is a schematic diagram of a dual-frequency compensation topology;
FIG. 3 is a schematic diagram of a full bridge inverter topology;
FIG. 4 is a schematic diagram of SPWM modulation;
FIG. 5 is a parameter design flow.
Detailed Description
The present invention will be described in detail with reference to specific examples.
The first embodiment is as follows:
as shown in fig. 1 to 4, the present invention provides a dual-frequency compensation and power decoupling control system for a dual-load WPT system, which specifically comprises:
a dual-frequency compensation and power decoupling control system for a dual-load WPT system comprises a transmitting end, a first receiving end and a second receiving end;
the transmitting end comprises a direct current power supply, a first DC/DC conversion circuit, a full-bridge inverter circuit, a double-frequency compensation network and a transmitting coil;
the direct current power supply is connected with a first DC/DC conversion circuit, the first DC/DC conversion circuit is connected with a full-bridge inverter circuit, the full-bridge inverter circuit is connected with a double-frequency compensation network, and the double-frequency compensation network is connected with a transmitting coil.
The first receiving end comprises a first receiving coil, a first series compensation circuit, a first high-frequency rectifying circuit, a second DC/DC conversion circuit and a first load;
the first receiving coil and the transmitting coil are mutually inductive, the first receiving coil is connected with a first series compensation circuit, the first series compensation circuit is connected with a first high-frequency rectifying circuit, the first high-frequency rectifying circuit is connected with a second DC/DC conversion circuit, and the second DC/DC conversion circuit is connected with a first load.
The second receiving end comprises a second receiving coil, a second series compensation circuit, a second high-frequency rectifying circuit, a third DC/DC conversion circuit and a second load;
the second receiving coil and the transmitting coil are mutually inductive, the second receiving coil is connected with a second series compensation circuit, the second series compensation circuit is connected with a second high-frequency rectifying circuit, the second high-frequency rectifying circuit is connected with a third DC/DC conversion circuit, and the third DC/DC conversion circuit is connected with a second load. The direct current power supply provides electric energy for the whole system, the first DC/DC conversion circuit realizes the adjustment of direct current bus voltage at the input side of the full-bridge inverter circuit, the full-bridge inverter circuit converts direct current into high-frequency alternating current for the transmitting coil to use, the double-frequency compensation network allows the current of two frequency components at the output end of the full-bridge inverter circuit to pass through and supply the current to the transmitting coil, the two components have the characteristic of hardware constant current, and the transmitting coil generates a high-frequency alternating magnetic field in the space under the excitation of the current of the two frequency components to establish an energy exchange channel.
The first receiving coil and the second receiving coil induce voltage in a high-frequency magnetic field generated by the transmitting coil, the high-frequency magnetic field is in a resonance state after being matched by the series compensation circuit, the high-frequency rectifying circuit rectifies received high-frequency alternating current into direct current so as to be convenient to transform and use, and the second DC/DC converter and the third DC/DC converter transform the direct current to match the charging requirement of a load.
The dual frequency compensation network comprises a capacitor Cf1Capacitor Cf2Inductor L1And an inductance Lf(ii) a The capacitor Cf1One end is connected with an inductor L1Output current of terminal, said capacitor Cf1The other end is connected with an inductor LfOne end of the inductor LfThe other end is connected with a capacitor Cf2One end of the capacitor Cf2The other end outputs the current of the transmitting coil.
For the transmission end compensation topology, the traditional serial (S) topology and parallel (P) topology have only one resonance point, while the LCL topology has two resonance points, but only one of them satisfies the hardware constant current condition. A new type of dual frequency compensation topology is therefore proposed herein, as shown in fig. 2. The high-impedance transmission circuit has two inherent resonance points, presents a high-impedance state for other frequency components, and two frequency components in the transmission current both meet the hardware constant current condition.
Wherein: l ispFor self-inductance of the transmitting coil, L1Is a series resonant inductor, LfIs a parallel resonant inductor, Cf1And Cf2Is a parallel resonant capacitor, CeqIs the equivalent capacitance of the parallel branch. u. ofinIs an input voltage, i.e. the output voltage of the full-bridge inverter circuit (3)inIs an input current, i.e. the output current, u of the full-bridge inverter circuit (3)oTo compensate for the output voltage of the network, ipIs the current of the transmitting coil. The double-frequency compensation topology takes LCL topology as a prototype, and two ends of a parallel resonance capacitor of the double-frequency compensation topology are connected with another group of LC resonance branches in parallel to introduce additional resonance points.
The dual-frequency compensation network comprises two resonant frequencies, one of which is the lowest resonant frequency omegaLOne is the highest resonance frequency ωHω is expressed by the following equation corresponding to the resonance frequencies of the first receiving terminal and the second receiving terminal, respectivelyLAnd ωH：
Wherein L is1Is a series resonant inductor, LfIs a parallel resonant inductor, CfIs a capacitor Cf1And a capacitor Cf2The value of (a).
The full-bridge inverter circuit comprises a power switch tube T1Power switch tube T2Power switch tube T3Power switch tube T4Antiparallel diode D1Antiparallel diode D2Antiparallel diode D3And an anti-parallel diode D4；
The power switch tube T3And power switch tube T1One end of the power switch tube is connected to the positive electrode of an adjustable direct current input voltage source, and the power switch tube T4And power switch tube T2One end of the power switch tube T is connected to the negative electrode of an adjustable direct current input voltage source1The other end is connected with a power switch tube T2The other end, the power switch tube T3The other end is connected with a power switch tube T4The other end, the anti-parallel diode D1Antiparallel diode D2Antiparallel diode D3And an anti-parallel diode D4Are respectively connected in parallel to the power switch tube T1Power switch tube T2Power switch tube T3And power switch tube T4The above.
The corresponding full-bridge inversion topology of the transmitting power supply is shown in fig. 3, Ed is adjustable direct current input voltage, and Uo is inversion source output voltage.
The schematic diagram of the SPWM modulation method is shown in FIG. 4, where usFor modulating waves with a frequency equal to the lower resonant frequency omega of the dual-frequency compensation networkL，ucIs a carrier wave with a frequency equal to the higher resonant frequency omega of the dual-frequency compensation networkH。
The method comprises the following steps of modulating a double-frequency compensation and power decoupling control system of a double-load WPT system through an SPWM modulation method, determining a modulation ratio M, and expressing the modulation ratio M through the following formula:
wherein M issFor modulating the amplitude of the wave, McIs the carrier amplitude.
The independent regulation of two frequency components of the emission current is realized by regulating the values of the direct current bus voltage and the modulation ratio M, and the effective values of the two frequency components of the emission current are expressed by the following formula:
wherein E isdIs a DC bus voltage, omega1And ω2Operating frequencies, J, of two main components of the emission current, respectively0Is a Bessel function.
The second embodiment is as follows:
as shown in fig. 5, the present invention provides a parameter design method:
given receiving end 1 output power Ps1Equivalent load resistance Rs1Given the output power P of the receiving end 2s2Equivalent load resistance Rs2；
Giving mutual inductance M between receiving end 1 and transmitting endps1Push out the induced voltage U of the receiving terminal 1s1Giving system efficiency index eta and receiving end interphase mutual inductance Ms12Push out the induced voltage U of the receiving terminal 2s2Giving mutual inductance M between the receiving end 2 and the transmitting endps2；
Push out omega1And Ip_ω1Product, determining the operating frequency omega1、ω2Push out ω2And Ip_ω2The product of the two or more of the first and second,
push out Ip_ω1Push out of Ip_ω2,
Push M ═ M*Lower DC bus voltage EdAnd a compensation inductance L1Push out the compensation inductance LfAnd a compensation capacitor Cf。
The above description is only a preferred embodiment of a dual-frequency compensation and power decoupling control system for a dual-load WPT system, and the protection range of the dual-frequency compensation and power decoupling control system for the dual-load WPT system is not limited to the above embodiments, and all technical solutions belonging to the idea belong to the protection range of the present invention. It should be noted that modifications and variations which do not depart from the gist of the invention will be those skilled in the art to which the invention pertains and which are intended to be within the scope of the invention.
Claims (8)
1. A dual-frequency compensation and power decoupling control system for a dual-load WPT system is characterized in that: the system comprises a transmitting end, a first receiving end and a second receiving end;
the transmitting end comprises a direct current power supply, a first DC/DC conversion circuit, a full-bridge inverter circuit, a double-frequency compensation network and a transmitting coil;
the direct current power supply is connected with a first DC/DC conversion circuit, the first DC/DC conversion circuit is connected with a full-bridge inverter circuit, the full-bridge inverter circuit is connected with a double-frequency compensation network, and the double-frequency compensation network is connected with a transmitting coil.
2. The dual-frequency compensation and power decoupling control system for the dual-load WPT system as claimed in claim 1, wherein: the first receiving end comprises a first receiving coil, a first series compensation circuit, a first high-frequency rectifying circuit, a second DC/DC conversion circuit and a first load;
the first receiving coil and the transmitting coil are mutually inductive, the first receiving coil is connected with a first series compensation circuit, the first series compensation circuit is connected with a first high-frequency rectifying circuit, the first high-frequency rectifying circuit is connected with a second DC/DC conversion circuit, and the second DC/DC conversion circuit is connected with a first load.
3. The dual-frequency compensation and power decoupling control system for the dual-load WPT system as claimed in claim 2, wherein: the second receiving end comprises a second receiving coil, a second series compensation circuit, a second high-frequency rectifying circuit, a third DC/DC conversion circuit and a second load;
the second receiving coil and the transmitting coil are mutually inductive, the second receiving coil is connected with a second series compensation circuit, the second series compensation circuit is connected with a second high-frequency rectifying circuit, the second high-frequency rectifying circuit is connected with a third DC/DC conversion circuit, and the third DC/DC conversion circuit is connected with a second load.
4. The dual-frequency compensation and power decoupling control system for the dual-load WPT system as claimed in claim 1, wherein: the dual frequency compensation network comprises a capacitor Cf1Capacitor Cf2Inductor L1And an inductance Lf(ii) a The capacitor Cf1One end is connected with an inductor L1Output current of terminal, said capacitor Cf1The other end is connected with an inductor LfOne end of the inductor LfThe other end is connected with a capacitor Cf2One end of the capacitor Cf2The other end outputs the current of the transmitting coil.
5. The dual-frequency compensation and power decoupling control system for the dual-load WPT system as claimed in claim 4, wherein: the dual-frequency compensation network comprises two resonant frequencies, one of which is the lowest resonant frequency omegaLOne is the highest resonance frequency ωHω is expressed by the following equation corresponding to the resonance frequencies of the first receiving terminal and the second receiving terminal, respectivelyLAnd ωH：
Wherein L is1Is a series resonant inductor, LfIs a parallel resonant inductor, CfIs a capacitor Cf1And a capacitor Cf2The value of (a).
6. The dual-frequency compensation and power decoupling control system for the dual-load WPT system as claimed in claim 1, wherein: the full-bridge inverter circuit comprises a power switch tube T1Power switch tube T2Power switch tube T3Power switch tube T4Antiparallel diode D1Antiparallel diode D2Antiparallel diode D3And an anti-parallel diode D4；
The power switch tube T3And power switch tube T1One end of the power switch tube is connected to the positive electrode of an adjustable direct current input voltage source, and the power switch tube T4And power switch tube T2One end of the power switch tube T is connected to the negative electrode of an adjustable direct current input voltage source1The other end is connected with a power switch tube T2The other end, the power switch tube T3The other end is connected with a power switch tube T4The other end, the anti-parallel diode D1Antiparallel diode D2Antiparallel diode D3And an anti-parallel diode D4Are respectively connected in parallel to the power switch tube T1Power switch tube T2Power switch tube T3And power switch tube T4The above.
7. The dual-frequency compensation and power decoupling control system for the dual-load WPT system as claimed in claim 6, wherein: the method comprises the following steps of modulating a double-frequency compensation and power decoupling control system of a double-load WPT system through an SPWM modulation method, determining a modulation ratio M, and expressing the modulation ratio M through the following formula:
wherein M issFor modulating the amplitude of the wave, McIs the carrier amplitude.
8. The dual-frequency compensation and power decoupling control system for the dual-load WPT system as claimed in claim 1, wherein: the independent regulation of two frequency components of the emission current is realized by regulating the values of the direct current bus voltage and the modulation ratio M, and the effective values of the two frequency components of the emission current are expressed by the following formula:
wherein E isdIs a DC bus voltage, omega1And ω2Operating frequencies, J, of two main components of the emission current, respectively0Is a Bessel function.
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