CN113572274A - Resonant wireless power transmission system with LCC-LCLCC compensation network - Google Patents
Resonant wireless power transmission system with LCC-LCLCC compensation network Download PDFInfo
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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
- 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
- H02M7/53—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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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention provides a resonant wireless power transmission system with an LCC-LCLCC compensation network, and relates to the technical field of wireless power transmission. The LCC resonant network is arranged at the transmitting end, and the LCC resonant network is arranged at the receiving end, so that the wireless power transmission system provided by the invention has better efficiency performance compared with the existing LCC-S and bilateral LCC type wireless power transmission systems, and the method specifically comprises the following steps: when the load changes, the change range of the electric energy transmission efficiency is smaller than that of the existing topological structure, and compared with the traditional structure, the electric energy transmission efficiency can be maintained more effectively, and the transmission is more stable. When the coil deflects, the descending amplitude of the transmission efficiency is smaller, and the anti-deflection capability is stronger.
Description
Technical Field
The invention relates to the technical field of wireless power transmission, in particular to a resonant wireless power transmission system with an LCC-LCLCC compensation network.
Background
The traditional electric energy transmission mode adopts plug-in type wired transmission, potential safety hazards such as sparks and high-voltage electric shock exist during power utilization, the power utilization safety is damaged, the power utilization reliability is low, and the safety requirements of some special industrial occasions are difficult to achieve. The wireless power transmission technology is a power transmission technology that has been widely discussed and researched to overcome these shortcomings. The wireless power transmission system is an emerging technology for realizing power transmission from a power supply to a load end within a certain distance without physical contact. Different from the traditional electric energy transmission mode of direct contact of metal wires, the radio transmission technology utilizes magnetic fields, laser or microwaves and the like as energy transmission media, so that electric direct contact is not needed between a power grid and electric equipment, the inherent defects of the traditional metal wire direct contact power supply mode are effectively overcome, and the utilization rate of the electric equipment to electric wires and wiring ports is greatly reduced.
The wireless electric energy transmission system carries out energy transmission by depending on the coupling of the coils, and because the electric energy transmission at a certain distance needs to be realized, the coupling coefficient between the coils is low, and the energy transmission efficiency is reduced. In order to improve the energy transmission efficiency, the transmitting and receiving coils need to be compensated, so that the transmitting coil and the receiving coil are in a resonance state, and the transmission efficiency of the system is greatly improved in the resonance state. However, the previous structures have some drawbacks and disadvantages: the basic series or parallel compensation network can not realize the constant current of the transmitting coil and the constant voltage output of the receiving end, the newly proposed LCC-S type and bilateral LCC type compensation networks can realize the constant current of the transmitting coil and the constant voltage output of the receiving end, but the load characteristics are still not good enough, the efficiency is obviously reduced when the load is changed, and meanwhile, the transmission efficiency is also obviously reduced when the transmitting coil and the receiving coil are misaligned and offset occurs.
Publication No. CN212063636U, publication date: 2020-12-01, a wireless power transmission device based on composite LCC compensation, which adopts a bilateral LCC type compensation network, also has the problems that the load characteristics are still not good enough, and the efficiency is obviously reduced when the load changes.
Disclosure of Invention
In order to overcome the technical problems, the invention provides a resonant wireless power transmission system with an LCC-LCLCC compensation network, which has more stable transmission and stronger anti-offset capability when the load changes.
The technical scheme of the invention is as follows:
a resonant wireless power transmission system with an LCC-lclclcc compensation network, comprising: a transmitting end and a receiving end; the transmitting end includes: first rectifying and filtering circuit, high-frequency power inverter circuit, LCC resonant network and transmitting coil L2(ii) a The receiving end includes: receiving coil L3The LCLCLCC resonant network and the second rectifying and filtering circuit;
the first rectification filter circuit of the transmitting end is connected with a high-frequency power inverter circuit, the high-frequency power inverter circuit is connected with an LCC resonance network, and the LCC resonance network is connected with a transmitting coil L2Receiving coil L at the receiving end3And the LCLCLCC resonant network is connected with the second rectifying and filtering circuit.
The technical scheme provides a main circuit topological structure of a resonant wireless power transmission system with an LCC-LCC compensation network, and the wireless power transmission system has better efficiency performance compared with the existing LCC-S and bilateral LCC type wireless power transmission systems by arranging an LCC resonant network at a transmitting end and arranging the LCC resonant network at a receiving end, and specifically comprises the following steps: when the load changes, the change range of the electric energy transmission efficiency is smaller than that of the existing topological structure, and compared with the traditional structure, the electric energy transmission efficiency can be maintained more effectively, and the transmission is more stable. When the coil deflects, the descending amplitude of the transmission efficiency is smaller, and the anti-deflection capability is stronger.
Further, the LCC resonant network includes: first inductance L1A first capacitor C1A second capacitor C2(ii) a The LCLCC resonant network includes: third capacitor C3A fourth capacitor C4A fourth inductor L4A fifth capacitor C5A fifth inductor L5；
Second capacitance C of LCC resonant network2And a transmitting coil L2Connected in series with the first capacitor C1In parallel, a first capacitor C1The first pin of the inductor is connected with a first inductor L1The second pin of the first inductor L1The first pin is connected with the first output end of the high-frequency power inverter circuit and the first capacitor C1The second pin of the high-frequency power inverter circuit is connected with the second output end of the high-frequency power inverter circuit; receiving coil L3Third capacitance C of resonant network with LCLCLCC3Connected in series with a fourth capacitor C4Parallel connection, a fourth capacitor C4The first pin of the inductor is connected with a fourth inductor L4First pin of, fourth inductance L4The second pin of the first inductor is connected with a fifth inductor L5The first pin of the first capacitor C5The first pin of the inductor is connected with a fourth inductor L4Second pin of (1), fifth capacitor C5The second pin of the first capacitor is connected with a fourth capacitor C4Second pin, fifth capacitor C5Second pin and fifth inductor L5And the second pins are connected with a second rectifying and filtering circuit.
Further, the first rectifying and filtering circuit includes: first rectifying diode D1A second rectifying diode D2A third rectifying diode D3A fourth rectifying diode D4An input filter capacitor Cin(ii) a First rectifying diode D1Is connected with a third rectifying diode D3Negative pole of (D), third rectifying diode3Is connected with a fourth rectifying diode D4The fourth rectifying diode D4Negative pole of the first rectifying diode D is connected with the second rectifying diode D2And a second rectifying diode D2Negative pole of the first rectifying diode D1Negative pole of (2), input filter capacitor CinA first end connected with a rectifier diode D2Negative pole of (2), input filter capacitor CinThe second end is connected with a four-rectifier diode D4The positive electrode of (1); positive pole of first rectifier diode and fourth rectifier diode D4The negative pole of the first rectifying and filtering circuit is used as the power input end of the first rectifying and filtering circuit and is input into the filtering capacitor CinTwo ends of the first rectifying filter circuit are used as a first rectifying filter circuitThe output end of the high-frequency power inverter circuit is connected with the high-frequency power inverter circuit.
Further, the high-frequency power inverter circuit is a full-bridge inverter circuit.
Among the above-mentioned technical scheme, adopt full-bridge inverter circuit, switching current is less, and conversion efficiency is high.
Further, the high frequency power inverter circuit includes: first MOS transistor Q1A second MOS transistor Q2And a third MOS transistor Q3And a fourth MOS transistor Q4；
First MOS transistor Q1The source electrode is connected with a second MOS tube Q2Drain electrode, second MOS transistor Q2The source electrode is connected with a fourth MOS tube Q4Source, fourth MOS transistor Q4The drain electrode is connected with a third MOS tube Q3Source, third MOS transistor Q3The drain electrode is connected with a first MOS transistor Q1Drain electrode, fourth MOS transistor Q4The source electrode is grounded; third MOS transistor Q3Drain electrode and fourth MOS transistor Q4The source electrodes are used as the input end of the high-frequency power inverter circuit and are connected with the output end of the first rectifying and filtering circuit; first MOS transistor Q1Source and fourth MOS transistor Q4The drain electrode is used as the output end of the high-frequency power inverter circuit and is connected with the LCC resonant network.
Further, the first MOS transistor Q1A second MOS transistor Q2And a third MOS transistor Q3And a fourth MOS transistor Q4Are all N-channel depletion type MOS tubes.
Further, the second rectifying and filtering circuit includes: first power diode DR1A second power diode DR2A third power diode DR3A fourth power diode DR4An output filter capacitor Co；
First power diode DR1Is connected with a third power diode DR3Negative pole of (2), third power diode DR3Is connected with a fourth power diode DR4Positive electrode of (1), fourth power diode DR4Negative pole of the first power diode D is connected with the second power diode DR2Anode of (2), second power diode DR2Negative pole of the first power diode DR1Negative electrode of (1), output filter capacitorCoThe first end is connected with a second power diode DR2Negative electrode of (1), output filter capacitor CoThe second end is connected with a fourth power diode DR4The positive electrode of (1); first power diode DR1And a fourth power diode DR4The negative electrode of the second rectifying and filtering circuit is used as the input end of the second rectifying and filtering circuit and is connected with the LCLCLCC resonant network, and the output filtering capacitor CoAnd the two ends of the second rectifying and filtering circuit are used as the output ends of the second rectifying and filtering circuit and are connected with a load electrical appliance.
Further, an output filter capacitor CoIs a polar capacitor, and outputs a filter capacitor CoThe first pin is a positive electrode of a capacitor, and a filter capacitor C is outputoThe second pin of (2) is a cathode of the capacitor.
Further, a fourth capacitor C4Is larger than the fifth capacitor C5The capacity of (c).
Further, a fourth rectifying capacitor C4Impedance Z ofC4Fifth rectifying capacitor C5Impedance Z ofC5And the impedance Z of the coupled inductorMThe size relationship of (A) is as follows:
the technical scheme provides a main circuit topological structure of a resonant wireless power transmission system with an LCC-LCLCC compensation network, and compared with the prior art, the technical scheme has the beneficial effects that: the LCC resonant network is arranged at the transmitting end, and the LCC resonant network is arranged at the receiving end, so that the wireless power transmission system provided by the invention has better efficiency performance compared with the existing LCC-S and bilateral LCC type wireless power transmission systems, and the method specifically comprises the following steps: when the load changes, the change range of the electric energy transmission efficiency is smaller than that of the existing topological structure, and compared with the traditional structure, the electric energy transmission efficiency can be maintained more effectively, and the transmission is more stable. When the coil deflects, the descending amplitude of the transmission efficiency is smaller, and the anti-deflection capability is stronger.
Drawings
FIG. 1 is a schematic diagram of the present invention;
FIG. 2 is a circuit block diagram of the present invention;
FIG. 3 is an equivalent circuit diagram of the LCC-LCLCC compensation network;
FIG. 4 is a schematic diagram comparing the efficiency change of the LCC-LCC topology and the conventional LCC-S topology when the load changes;
fig. 5 is a three-dimensional schematic diagram comparing the efficiency variation of the LCC-LCLCC topology and the conventional LCC-S topology when the load and coupling coefficient are varied.
Detailed Description
For clearly illustrating the resonant wireless power transmission system with LCC-LCLCC compensation network of the present invention, the present invention will be further described with reference to the examples and the accompanying drawings, but the protection scope of the present invention should not be limited thereby.
Example 1
A resonant wireless power transmission system with an LCC-lclclcc compensation network, the schematic circuit diagram of which is shown in fig. 1, comprising: a transmitting end and a receiving end; the transmitting end includes: first rectifying and filtering circuit, high-frequency power inverter circuit, LCC resonant network and transmitting coil L2(ii) a The receiving end includes: receiving coil L3The LCLCLCC resonant network and the second rectifying and filtering circuit;
the first rectification filter circuit of the transmitting end is connected with a high-frequency power inverter circuit, the high-frequency power inverter circuit is connected with an LCC resonance network, and the LCC resonance network is connected with a transmitting coil L2Receiving coil L at the receiving end3And the LCLCLCC resonant network is connected with the second rectifying and filtering circuit.
In the embodiment, the input of the alternating current power supply reaches the transmitting coil L through the first rectifying and filtering circuit, the high-frequency power inverter circuit and the LCC resonant network of the transmitting end in sequence2Transmitting coil L2Electric energy is transmitted to a receiving coil L in a wireless mode3A receiving coil L3The electric energy is output to the LCLCC resonant network, and then reaches a load after passing through the second rectifying and filtering circuit to supply power for the load.
According to the technical scheme, the LCC resonant network is arranged at the transmitting end, and the LCC resonant network is arranged at the receiving end, so that the wireless power transmission system provided by the invention has better efficiency performance compared with the existing LCC-S and bilateral LCC type wireless power transmission systems, and specifically comprises the following steps: when the load changes, the change range of the electric energy transmission efficiency is smaller than that of the existing topological structure, and compared with the traditional structure, the electric energy transmission efficiency can be maintained more effectively, and the transmission is more stable. When the coil deflects, the descending amplitude of the transmission efficiency is smaller, and the anti-deflection capability is stronger.
Example 2
A resonant wireless power transmission system with an LCC-lclclcc compensation network, the circuit principle of which is shown in fig. 1, comprising: a transmitting end and a receiving end; the transmitting end includes: first rectifying and filtering circuit, high-frequency power inverter circuit, LCC resonant network and transmitting coil L2(ii) a The receiving end includes: receiving coil L3The LCLCLCC resonant network and the second rectifying and filtering circuit;
the first rectification filter circuit of the transmitting end is connected with a high-frequency power inverter circuit, the high-frequency power inverter circuit is connected with an LCC resonance network, and the LCC resonance network is connected with a transmitting coil L2Receiving coil L at the receiving end3And the LCLCLCC resonant network is connected with the second rectifying and filtering circuit.
In the embodiment, the input of the alternating current power supply reaches the transmitting coil L through the first rectifying and filtering circuit, the high-frequency power inverter circuit and the LCC resonant network of the transmitting end in sequence2Transmitting coil L2Electric energy is transmitted to a receiving coil L in a wireless mode3A receiving coil L3The electric energy is output to the LCLCC resonant network, and then reaches a load after passing through the second rectifying and filtering circuit to supply power for the load.
The circuit structure of the wireless power transmission system of this embodiment is shown in fig. 2, wherein the LCC resonant network includes: first inductance L1A first capacitor C1A second capacitor C2(ii) a The LCLCC resonant network includes: third capacitor C3A fourth capacitor C4A fourth inductor L4A fifth capacitor C5A fifth inductor L5；
Second capacitance C of LCC resonant network2And a transmitting coil L2Connected in series with the first capacitor C1In parallel, a first capacitor C1The first pin of the inductor is connected with a first inductor L1The second pin of the first inductor L1The first pin is connected with the first output end of the high-frequency power inverter circuit and the first capacitor C1The second pin of the high-frequency power inverter circuit is connected with the second output end of the high-frequency power inverter circuit; receiving coil L3Third capacitance C of resonant network with LCLCLCC3Connected in series with a fourth capacitor C4Parallel connection, a fourth capacitor C4The first pin of the inductor is connected with a fourth inductor L4First pin of, fourth inductance L4The second pin of the first inductor is connected with a fifth inductor L5The first pin of the first capacitor C5The first pin of the inductor is connected with a fourth inductor L4Second pin of (1), fifth capacitor C5The second pin of the first capacitor is connected with a fourth capacitor C4Second pin, fifth capacitor C5Second pin and fifth inductor L5And the second pins are connected with a second rectifying and filtering circuit.
The first rectifying and filtering circuit comprises: first rectifying diode D1A second rectifying diode D2A third rectifying diode D3A fourth rectifying diode D4An input filter capacitor Cin(ii) a First rectifying diode D1Is connected with a third rectifying diode D3Negative pole of (D), third rectifying diode3Is connected with a fourth rectifying diode D4The fourth rectifying diode D4Negative pole of the first rectifying diode D is connected with the second rectifying diode D2And a second rectifying diode D2Negative pole of the first rectifying diode D1Negative pole of (2), input filter capacitor CinA first end connected with a rectifier diode D2Negative pole of (2), input filter capacitor CinThe second end is connected with a four-rectifier diode D4The positive electrode of (1); positive pole of first rectifier diode and fourth rectifier diode D4The negative pole of the first rectifying and filtering circuit is used as the power input end of the first rectifying and filtering circuit and is input into the filtering capacitor CinAnd the two ends of the first rectifying and filtering circuit are used as the output ends of the first rectifying and filtering circuit and are connected with the high-frequency power inverter circuit.
In this embodiment, the ac power input to the first rectifying-filtering circuit is 220V commercial power,220V commercial power is converted into steamed bread waves through a first rectifying and filtering circuit, and a filtering capacitor CinThe steamed bread wave is converted into direct current with the amplitude of 310V and is transmitted to a high-frequency power inverter circuit.
The high-frequency power inverter circuit is a full-bridge inverter circuit.
The high-frequency power inverter circuit includes: the MOS transistor comprises a first MOS transistor Q1, a second MOS transistor Q2, a third MOS transistor Q3 and a fourth MOS transistor Q4;
first MOS transistor Q1The source electrode is connected with a second MOS tube Q2Drain electrode, second MOS transistor Q2The source electrode is connected with a fourth MOS tube Q4Source, fourth MOS transistor Q4The drain electrode is connected with a third MOS tube Q3Source, third MOS transistor Q3The drain electrode is connected with a first MOS transistor Q1Drain electrode, fourth MOS transistor Q4The source electrode is grounded; third MOS transistor Q3Drain electrode and fourth MOS transistor Q4The source electrodes are used as the input end of the high-frequency power inverter circuit and are connected with the output end of the first rectifying and filtering circuit; first MOS transistor Q1Source and fourth MOS transistor Q4The drain electrode is used as the output end of the high-frequency power inverter circuit and is connected with the LCC resonant network.
In this embodiment, the high-frequency power inverter circuit employs an N-channel depletion type MOS transistor; the high-frequency power inverter circuit is used for converting direct current obtained by rectifying and filtering the preceding stage into high-frequency alternating current. The square wave PWM signal is applied to the grid electrode of the MOS tube, and the on-off of the MOS tube is controlled by controlling the square wave PWM signal to the G pole (namely, a control pole) of the MOS tube, so that direct current is converted into high-frequency alternating current.
In the specific implementation process, the PWM wave frequency applied by the grid electrode of the MOS tube is adjusted and controlled, and the resonance of the compensation network is combined, so that the process of the MOS tube during the switching-on and switching-off is a soft switching process, and the transmission efficiency is improved.
The second rectifying and filtering circuit comprises: first power diode DR1A second power diode DR2A third power diode DR3A fourth power diode DR4An output filter capacitor Co；
First power diode DR1Is connected with a third power diode DR3Negative pole of (2), third power diode DR3Is connected with a fourth power diode DR4Positive electrode of (1), fourth power diode DR4Negative pole of the first power diode D is connected with the second power diode DR2Anode of (2), second power diode DR2Negative pole of the first power diode DR1Negative electrode of (1), output filter capacitor CoThe first end is connected with a second power diode DR2Negative electrode of (1), output filter capacitor CoThe second end is connected with a fourth power diode DR4The positive electrode of (1); first power diode DR1And a fourth power diode DR4The negative electrode of the second rectifying and filtering circuit is used as the input end of the second rectifying and filtering circuit and is connected with the LCLCLCC resonant network, and the output filtering capacitor CoAnd the two ends of the second rectifying and filtering circuit are used as the output ends of the second rectifying and filtering circuit and are connected with a load electrical appliance.
The second rectifying and filtering circuit is used for enabling the high-frequency alternating-current sine wave received by the LCLCC resonant network of the receiving end to pass through a diode D of the receiving endR1、DR2、DR3、DR4Converted into high-frequency steamed bread waves, and then passed through filter capacitor COThe high-frequency steamed bread wave is converted into direct current and is transmitted to load equipment for use.
In this embodiment, the output filter capacitor CoIs a polar capacitor, and outputs a filter capacitor CoThe first pin is a positive electrode of a capacitor, and a filter capacitor C is outputoThe second pin of (2) is a cathode of the capacitor. Because the direct current is output through the rectification of the second rectification filter circuit, a capacitor with polarity must be adopted. In addition, the output filter capacitor has larger capacitance, and the capacitance of the capacitor with polarity is much larger than that of the capacitor without polarity under the same volume, thereby obtaining better circuit performance.
Fourth capacitor C4Is larger than the fifth capacitor C5The capacity of (c).
Fourth rectifying capacitor C4Impedance Z ofC4Fifth rectifying capacitor C5Impedance Z ofC5And the magnitude relation of the coupling inductance impedance ZM is as follows:
example 3
In the present embodiment, the characteristics of the LCC-LCLCLCC compensation network are analyzed, and the equivalent circuit diagram of the LCC-LCLCLCC compensation network is shown in FIG. 3, wherein R1～R5R is the sum of the inductance, the capacitance and the parasitic resistance of the coil in each loop respectivelyLRepresenting the load resistance, while both the inductance and capacitance of fig. 3 are considered ideal devices. Wherein Z isMThe coupling impedance is an equivalent impedance of the circuit at the other end (the transmitting end coupled to the receiving end, the receiving end coupled to the transmitting end) due to the coil coupling.
The parasitic resistance is expressed as:
R1＝RL1+RC1
R2＝RC1+RC2+RL2
R3＝RC3+RC4+RL3
R4＝RC4+RC5+RL4
R5＝RL5+RC5
kirchhoff analysis was performed on five loops:
UIN＝(ZL1+ZC1)·IIN+R1·IIN-ZC1·I1
0＝(ZC1+ZC2+ZL2)·I1+R2·I1-ZC1·IIN+I2ZM
0＝(ZC3+ZC4+ZL3)·I2+R3·I2-ZC4·I3+I1ZM
0＝(ZC4+ZC5+ZL4)·I3+R4·I3-ZC4·I2-ZC5·IO
0＝(ZC5+ZL5)·IO+(R5+RL)·IO-ZC5·I3
since the circuit operates in a resonant state, i.e. the inductance and capacitance of each mesh are in resonance, as indicated in parentheses in the above formula: l is1And C1Resonance, C1、C2And L2Resonance, C3、C4And L3Resonance, C4、C5And L4Resonance, C5And L5Resonating; at resonance the above equation can be expressed as:
UIN＝R1·IIN-ZC1·I1
0＝R2·I1-ZC1·IIN+I2ZM
0＝R3·I2-ZC4·I3+I1ZM
0＝R4·I3-ZC4·I2-ZC5·IO
0＝(R5+RL)·IO-ZC5·I3
in matrix form:
solving the matrix, and simplifying to obtain the efficiency expression of the wireless power transmission system with the LCC-LCLCC compensation network:
when the parasitic impedance is ignored, an input current expression, a transmitting coil current expression, an output voltage expression and a transmission power expression of the wireless power transmission system with the LCC-LCLCC compensation network are obtained, and the following steps are sequentially carried out:
the above five expressions are theoretically illustrated:
(1) the input current does not contain an imaginary part and presents pure resistance, theoretically illustrates the possibility of realizing a Zero Phase Angle (ZPA) of the circuit, and provides a calculation formula of the input current. The input current expression does not contain an imaginary part, namely, no phase difference exists (if the phase difference exists, the imaginary part exists), theoretically, a circuit zero phase angle ZPA can be realized, the circuit zero phase angle ZPA means that no phase difference exists, reactive power can be reduced due to the fact that no phase difference exists, and the efficiency of the system is improved.
(2) Current and input voltage of transmitting coil and first capacitor C1Is dependent on the value of (a), independent of the load, the transmitter coil L is realized2Constant current of (2).
(3) The output voltage is independent of the load, so that the condition of constant voltage output is achieved, and the output voltage, the input voltage, the coupling degree of the coil and the capacitor C are disclosed1、C4、C5It is related.
(4) Discloses transmission power and input voltage, coil coupling degree and capacitance C of a wireless power transmission system with an LCC-LCLCC compensation network1、C4、C5And load dependent.
(5) Discloses the transmission efficiency, the coil coupling degree and the capacitance C of a wireless power transmission system with an LCC-LCLCC compensation network1、C4、C5Parasitic resistance and load haveAnd off.
In order to achieve the aforementioned advantages, the present invention has better transmission efficiency performance than the conventional wireless power transmission system (such as LCC-S type), and the capacitor C4Impedance Z ofC4Capacitor C5Impedance Z ofC5And the impedance Z of the coupled inductorMThe following equation is satisfied:
i.e. the fourth capacitance C4Must be greater than the fifth capacitance C5The difference value of the two is required to be larger than the minimum difference value calculated by the formula, and the method has the advantages. This is an important parameter feature of the present invention.
Compared with the traditional technical structure, the invention increases the complexity of the compensation network, and the added devices carry out parameter design according to the parameter characteristics provided by the invention, thereby realizing the advantages of the invention: (1) when the load changes, the change range of the transmission efficiency is smaller than that of the existing topological structure, and compared with the traditional structure, the transmission efficiency can be maintained higher, and the transmission is more stable. (2) When the coil deflects, the descending amplitude of the transmission efficiency is smaller, and the anti-deflection capability is stronger.
A comparison schematic diagram of the efficiency change situation of the LCC-LCC topology of the embodiment and the conventional LCC-S topology when the load changes is shown in fig. 4, where when the load changes from a heavy load to a light load, the efficiency maintenance capability is stronger, the efficiency is higher when the load changes from the light load, and the load range is wider;
a three-dimensional schematic diagram comparing the efficiency change conditions of the LCC-LCC topology and the conventional LCC-S topology when the load and the coupling coefficient change is shown in fig. 5, and it can be seen that, when the load and the coupling coefficient change, the efficiency of the wireless power transmission system of the embodiment is higher than that of the conventional LCC-S topology in most interval ranges; thus the transmitting coil L2And a receiving coil L3When deviation occurs, namely the coupling coefficient is reduced, the resonant wireless power transmission system adopting the LCC-LCLCC compensation network has stronger efficiency maintaining capability and stronger anti-deviation effect.
Claims (10)
1. A resonant wireless power transmission system with an LCC-LCLCC compensation network, comprising: a transmitting end and a receiving end; the transmitting end includes: first rectifying and filtering circuit, high-frequency power inverter circuit, LCC resonant network and transmitting coil L2(ii) a The receiving end includes: receiving coil L3The LCLCLCC resonant network and the second rectifying and filtering circuit;
the first rectification filter circuit of the transmitting end is connected with a high-frequency power inverter circuit, the high-frequency power inverter circuit is connected with an LCC resonance network, and the LCC resonance network is connected with a transmitting coil L2Receiving coil L at the receiving end3And the LCLCLCC resonant network is connected with the second rectifying and filtering circuit.
2. The resonant wireless power transmission system with the LCC-LCLCC compensation network of claim 1, wherein the LCC resonant network comprises: first inductance L1A first capacitor C1A second capacitor C2(ii) a The LCLCC resonant network includes: third capacitor C3A fourth capacitor C4A fourth inductor L4A fifth capacitor C5A fifth inductor L5；
Second capacitance C of LCC resonant network2And a transmitting coil L2Connected in series with the first capacitor C1In parallel, a first capacitor C1The first pin of the inductor is connected with a first inductor L1The second pin of the first inductor L1The first pin is connected with the first output end of the high-frequency power inverter circuit and the first capacitor C1The second pin of the high-frequency power inverter circuit is connected with the second output end of the high-frequency power inverter circuit; receiving coil L3Third capacitance C of resonant network with LCLCLCC3Connected in series with a fourth capacitor C4Parallel connection, a fourth capacitor C4The first pin of the inductor is connected with a fourth inductor L4First pin of, fourth inductance L4The second pin of the first inductor is connected with a fifth inductor L5The first pin of the first capacitor C5The first pin of the inductor is connected with a fourth inductor L4Second lead of (2)Pin, fifth capacitor C5The second pin of the first capacitor is connected with a fourth capacitor C4Second pin, fifth capacitor C5Second pin and fifth inductor L5And the second pins are connected with a second rectifying and filtering circuit.
3. The resonant wireless power transmission system with the LCC-LCLCC compensation network of claim 2, wherein the first rectifying and filtering circuit comprises: first rectifying diode D1A second rectifying diode D2A third rectifying diode D3A fourth rectifying diode D4An input filter capacitor Cin(ii) a First rectifying diode D1Is connected with a third rectifying diode D3Negative pole of (D), third rectifying diode3Is connected with a fourth rectifying diode D4The fourth rectifying diode D4Negative pole of the first rectifying diode D is connected with the second rectifying diode D2And a second rectifying diode D2Negative pole of the first rectifying diode D1Negative pole of (2), input filter capacitor CinA first end connected with a rectifier diode D2Negative pole of (2), input filter capacitor CinThe second end is connected with a four-rectifier diode D4The positive electrode of (1); positive pole of first rectifier diode and fourth rectifier diode D4The negative pole of the first rectifying and filtering circuit is used as the power input end of the first rectifying and filtering circuit and is input into the filtering capacitor CinAnd the two ends of the first rectifying and filtering circuit are used as the output ends of the first rectifying and filtering circuit and are connected with the high-frequency power inverter circuit.
4. The resonant wireless power transmission system with the LCC-LCLCC compensation network as claimed in claim 1, wherein the high frequency power inverter circuit is a full bridge inverter circuit.
5. The resonant wireless power transmission system with the LCC-LCLCC compensation network as claimed in claim 3, wherein the high frequency power inverter circuit comprises: first MOS transistor Q1A second MOS transistor Q2And a third MOS transistor Q3And a fourth MOS transistor Q4；
First MOS transistor Q1The source electrode is connected with a second MOS tube Q2Drain electrode, second MOS transistor Q2The source electrode is connected with a fourth MOS tube Q4Source, fourth MOS transistor Q4The drain electrode is connected with a third MOS tube Q3Source, third MOS transistor Q3The drain electrode is connected with a first MOS transistor Q1Drain electrode, fourth MOS transistor Q4The source electrode is grounded; third MOS transistor Q3Drain electrode and fourth MOS transistor Q4The source electrodes are used as the input end of the high-frequency power inverter circuit and are connected with the output end of the first rectifying and filtering circuit; first MOS transistor Q1Source and fourth MOS transistor Q4The drain electrode is used as the output end of the high-frequency power inverter circuit and is connected with the LCC resonant network.
6. The resonant wireless power transmission system with the LCC-LCLCLCC compensation network as claimed in claim 5, wherein the first MOS transistor Q1A second MOS transistor Q2And a third MOS transistor Q3And a fourth MOS transistor Q4Are all N-channel depletion type MOS tubes.
7. The resonant wireless power transmission system with the LCC-LCLCC compensation network of claim 2, wherein the second rectifying and filtering circuit comprises: first power diode DR1A second power diode DR2A third power diode DR3A fourth power diode DR4An output filter capacitor Co；
First power diode DR1Is connected with a third power diode DR3Negative pole of (2), third power diode DR3Is connected with a fourth power diode DR4Positive electrode of (1), fourth power diode DR4Negative pole of the first power diode D is connected with the second power diode DR2Anode of (2), second power diode DR2Negative pole of the first power diode DR1Negative electrode of (1), output filter capacitor CoThe first end is connected with a second power diode DR2Negative electrode of (1), output filter capacitor CoThe second end is connected with a fourth power diode DR4The positive electrode of (1);first power diode DR1And a fourth power diode DR4The negative electrode of the second rectifying and filtering circuit is used as the input end of the second rectifying and filtering circuit and is connected with the LCLCLCC resonant network, and the output filtering capacitor CoAnd the two ends of the second rectifying and filtering circuit are used as the output ends of the second rectifying and filtering circuit and are connected with a load electrical appliance.
8. The resonant wireless power transmission system of claim 7, wherein the output filter capacitor CoIs a polar capacitor, and outputs a filter capacitor CoThe first pin is a positive electrode of a capacitor, and a filter capacitor C is outputoThe second pin of (2) is a cathode of the capacitor.
9. The resonant wireless power transmission system with the LCC-LCLCLCC compensation network as claimed in claim 2, wherein the fourth capacitor C4Is larger than the fifth capacitor C5The capacity of (c).
10. The resonant wireless power transmission system of claim 2, wherein the fourth rectifying capacitor C is configured to be coupled to the second rectifying capacitor C4Impedance Z ofC4Fifth rectifying capacitor C5Impedance Z ofC5And the magnitude relation of the coupling inductance impedance ZM is as follows:
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