CN112366835A - Wireless power transmission system with double-end power supply - Google Patents

Wireless power transmission system with double-end power supply Download PDF

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Publication number
CN112366835A
CN112366835A CN202011236742.6A CN202011236742A CN112366835A CN 112366835 A CN112366835 A CN 112366835A CN 202011236742 A CN202011236742 A CN 202011236742A CN 112366835 A CN112366835 A CN 112366835A
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power supply
transmitting coil
supply circuit
cut
compensation capacitor
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CN112366835B (en
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范满义
史黎明
殷正刚
潘硕
裴春兴
曹春伟
岳成林
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Institute of Electrical Engineering of CAS
CRRC Tangshan Co Ltd
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Institute of Electrical Engineering of CAS
CRRC Tangshan Co Ltd
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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
    • 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

Abstract

A wireless power transfer system powered on both ends, comprising in a transmitting part: DC power supply E1High frequency inverter H1Compensator S1And a compensation inductance L1And a compensation capacitor C1Sequentially connected to form a T-shaped power supply circuit I and a DC power supply E2High frequency inverter H2Compensator S2And a compensation inductance L2And a compensation capacitor C2And the T-shaped power supply circuits II are sequentially connected to form the T-shaped power supply circuit II. A power supply circuit I, a transmitting coil P, a compensating capacitor C and a power supply circuit II are sequentially connected in series, and a direct current power supply E1And a DC power supply E2The power supply circuit I and the power supply circuit II are respectively arranged at two ends of the transmitting coil P. When the system is supplied with power at two ends, the first cut-off switch Q1And a second cut-off switch Q2And simultaneously, the power supply circuit is disconnected, and when the power supply circuit has a fault, the fault circuit can be disconnected through the corresponding disconnecting switchBesides, the other power supply circuit supplies power independently, so that the normal operation of the system is guaranteed.

Description

Wireless power transmission system with double-end power supply
Technical Field
The invention relates to a double-end power supply induction type wireless power transmission system.
Background
The existing rail transit vehicles mostly adopt a pantograph or a third rail mode for power supply. When the rail transit vehicle runs, carbon deposit is easily generated by friction of the pantograph or the third rail, poor contact is caused, the vehicle is disconnected from the network and powered off, the reliability of a power supply system is reduced, the service life of equipment of the vehicle power supply system is also influenced, and the pantograph or the third rail needs high maintenance cost. The inductive electric energy transmission based on the electromagnetic induction principle realizes the electric energy non-contact transmission, solves the problems of spark, friction, carbon deposit and the like caused by contact power supply, avoids the potential danger of electric shock of electric equipment in environments such as moist environment, underwater environment and the like, has the advantages of safety, reliability, convenience, no pollution and the like, can replace the existing electrified traffic equipment pantograph and contact network or third rail power supply mode, and can greatly improve the power supply safety and reliability.
The existing induction type wireless power transmission system mainly comprises the following steps: rectifying the power frequency alternating current to obtain direct current voltage, then generating high frequency alternating current after high frequency inversion, and injecting the high frequency alternating current into a transmitting coil to generate a high frequency alternating magnetic field; the receiving coil obtains induced electromotive force through electromagnetic induction, obtains direct current after high-frequency rectification, and provides electric energy for a load.
In the field of long-distance power supply of rail transit, according to a ground high-frequency inverter configuration scheme, existing power supply systems can be divided into centralized power supply and distributed power supply. The centralized power supply is to supply power to the transmitting coils through a high-power high-frequency power supply with capacity through a change-over switch, the distributed power supply is to supply power to the segmented transmitting coils through a plurality of low-capacity high-frequency inverters, and the double-end power supply structure is to arrange the high-frequency inverters and two ends of the transmitting coils and supply power to the same transmitting coil at the same time. Compared with centralized power supply and distributed power supply, the double-end power supply can reduce the length of a feeder cable, reduce the extra loss of the system and improve the working efficiency of the system; the power capacity of a single power supply is reduced; when the power supply circuit breaks down, the system can cut off the fault circuit and is independently supplied with power by the other power supply circuit, and normal operation of the system is guaranteed.
Chinese patent 201610318334.2, "method for controlling double-end power supply of inductive coupling power transmission system", discloses a wireless power transmission double-end power supply structure and method for controlling output power and current, but the system can be equivalent to a high-frequency power supply with parallel output terminals, and the system requires a feeder cable with the same length as the transmitting coil. In addition, no double-end power supply technology for wireless energy transmission is reported in the prior literature.
Chinese patent 201510130015.4, "two-wire parallel-wound wireless power transmission system and output power distribution method thereof," discloses a two-wire parallel-wound wireless power transmission system and output power distribution method thereof. However, the input ends of the two parallel-wound transmitting coils of the system are respectively connected with the two inverters, double-end power supply cannot be realized by the structure, and meanwhile, if one set of power supply system fails, the output power of the system is reduced, and the normal operation of the system cannot be ensured.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a wireless power transmission system with double-end power supply and a fault removal method thereof.
The invention is suitable for a wireless power transmission system with long-distance power supply, in particular to a high-power and large-current long-distance wireless power transmission system, such as a rail transit wireless power transmission system, and has high efficiency and high reliability.
The invention adopts the technical scheme that the invention achieves the aim that:
a wireless power transmission system with double-end power supply comprises a transmitting part and a receiving part.
The receiving part comprises a receiving coil, a receiving side compensation capacitor, a rectifying and filtering circuit and a load which are connected in sequence.
The transmitting part comprises a power supply circuit I, a power supply circuit II, a transmitting coil P, a compensation capacitor C and a fault removal switch. DC power supply E1High frequency inverter H1Compensator S1And a compensation inductance L1And a compensation capacitor C1Sequentially connected to form a T-shaped power supply circuit I and a DC power supply E2High frequency inverter H2Compensating device S2And a compensation inductance L2And a compensation capacitor C2Sequentially connected to form a T-shaped power supply circuit II and a DC power supply E1And a DC power supply E2The power supply circuit I is connected with the transmitting coil P, the compensating capacitor C and the power supply circuit II in series in sequence to form a wireless power transmission system with double-end power supply, the power supply circuit I and the power supply circuit II are respectively arranged at two ends of the transmitting coil, and the compensating capacitor C comprises a compensating capacitor Cp1And a compensation capacitor Cp2. First cut-off switch Q1A second cut-off switch Q connected in parallel with the output of the supply circuit I2The output end of the power supply circuit II is connected in parallel; first cut-off switch Q1Control terminal and controller K1Connected, second cut-off switch Q2Control terminal and controller K2Are connected. When the wireless power transmission system with double-end power supply carries out double-end power supply, the first cut-off switch Q1And a second cut-off switch Q2Simultaneous disconnection, high frequency inverter H1And a high frequency inverter H2Simultaneous power supply, high frequency inverter H1And a high frequency inverter H2The operating frequencies are equal and the output voltages are 180 degrees out of phase.
The transmitting coil P comprises a transmitting coil Lp1And a transmitting coil Lp2And a transmitting coil Lp1And a transmitting coil Lp2Parallel wound, transmitting coil Lp1Is connected with one end of a power supply circuit I, a transmitting coil Lp1Another terminal of (1) and a compensation capacitor Cp1After being connected in series, the power supply circuit is connected with one end of a power supply circuit II; transmitting coil Lp2Is connected with the other end of the power supply circuit I, and a transmitting coil Lp2Another terminal of (1) and a compensation capacitor Cp2And the other end of the power supply circuit II is connected with the other end of the power supply circuit II after being connected in series.
According to the fault removing method of the wireless power transmission system with double-end power supply, when the power supply circuit I breaks down, the controller K1Control the first cut-off switch Q1Closing, cutting off the power supply circuit I, and controlling the controller K2Controlling the second cut-off switch Q2Keeping the disconnection state, and independently supplying power to the wireless power transmission system with double-end power supply by a power supply circuit II; when the power supply circuit II is in fault, the controller K2Controlling the second cut-off switch Q2Closing, cutting off the power supply circuit II, and controlling the controller K1Control the first cut-off switch Q1And keeping the disconnection state, and independently supplying power to the wireless power transmission system with double-end power supply by a power supply circuit I.
The compensator S1Impedance value of
Figure BDA0002766940490000031
And a compensator S2Impedance value of
Figure BDA0002766940490000032
Determined by equation (1):
Figure BDA0002766940490000033
in the formula (1), the reaction mixture is,
Figure BDA0002766940490000034
is a DC power supply E1And a DC power supply E2Value of the output voltage VLSetting a voltage, omega, for the direct current output of the receiving sideFor the system operating angular frequency, M is the receiving coil LsAnd a transmitting coil Lp1And the receiving coil LsAnd a transmitting coil Lp2Mutual inductance value between, receiving coil LsAnd a transmitting coil Lp1Mutual inductance value of, receiving coil LsAnd a transmitting coil Lp2The mutual inductance values are equal, and are all M, and j is an imaginary number symbol.
The compensation inductance L1Inductance value of
Figure BDA0002766940490000035
And a compensation inductance L2Inductance value of
Figure BDA0002766940490000036
Determined by equation (2):
Figure BDA0002766940490000037
in the formula (2), the reaction mixture is,
Figure BDA0002766940490000038
is a DC power supply E1And a DC power supply E2Value of the output voltage VLA set voltage is output for the DC output of the receiving side, M is a receiving coil LsAnd a transmitting coil Lp1And the receiving coil LsAnd a transmitting coil Lp2Mutual inductance value between, receiving coil LsAnd a transmitting coil Lp1Mutual inductance value of, receiving coil LsAnd a transmitting coil Lp2The mutual inductance values between the two groups are equal and are all M.
The compensation capacitor C1Capacity of
Figure BDA0002766940490000039
And a compensation capacitor C2Capacity of
Figure BDA00027669404900000310
Determined by equation (3):
Figure BDA00027669404900000311
in the formula (3), the reaction mixture is,
Figure BDA00027669404900000312
is a DC power supply E1And a DC power supply E2Value of the output voltage VLSetting voltage for DC output of receiving side, where omega is angular frequency of system operation, and M is receiving coil LsAnd a transmitting coil Lp1And the receiving coil LsAnd a transmitting coil Lp2Mutual inductance value between, receiving coil LsAnd a transmitting coil Lp1Mutual inductance value of, receiving coil LsAnd a transmitting coil Lp2The mutual inductance values between the two groups are equal and are all M.
The compensation capacitor Cp1Capacity of
Figure BDA00027669404900000313
Determined by equation (4):
Figure BDA00027669404900000314
in the formula (4), ω is the system operating angular frequency,
Figure BDA00027669404900000315
is a transmitting coil Lp1Inductance value of, MppIs a transmitting coil Lp1And a transmitting coil Lp2The mutual inductance value between them.
The compensation capacitor Cp2Capacity of
Figure BDA00027669404900000316
Determined by equation (5):
Figure BDA0002766940490000041
in the formula (5), ω is the system operating angular frequency,
Figure BDA0002766940490000042
is a transmitting coil Lp2Inductance value of, MppIs a transmitting coil Lp1And a transmitting coil Lp2The mutual inductance value between them.
When the wireless power transmission system with double-end power supply carries out double-end power supply, the controller K1Control the first cut-off switch Q1Disconnect, controller K2Controlling the second cut-off switch Q2Cut-off, high-frequency inverter H1And a high frequency inverter H2And meanwhile, power is supplied to the transmitting coil, the working frequencies of the two high-frequency inverters are equal, and the phase difference of the output voltages is 180 degrees.
When the power supply circuit I is in fault, the controller K1Control the first cut-off switch Q1Closing, cutting off the power supply circuit I, and controlling the controller K2Controlling the second cut-off switch Q2Keeping the disconnection state, and independently supplying power to the wireless power transmission system with double-end power supply by a power supply circuit II;
when the power supply circuit II is in fault, the controller K2Controlling the second cut-off switch Q2Closing, cutting off the power supply circuit II, and controlling the controller K1Control the first cut-off switch Q1And keeping the disconnection state, and independently supplying power to the wireless power transmission system with double-end power supply by a power supply circuit I.
The theoretical analysis and circuit principle of the wireless power transmission system with double-end power supply are as follows:
according to an equivalent circuit when the two ends of the system are powered on, the relationship among the electrical quantities of the system based on kirchhoff's law is as follows:
Figure BDA0002766940490000043
in the formula (6), the reaction mixture is,
Figure BDA0002766940490000044
for high frequency inverter H1The fundamental component of the output voltage is,
Figure BDA0002766940490000045
for high frequency inverter H2The fundamental component of the output voltage, omega is the angular frequency of system operation, j is the imaginary number sign,
Figure BDA0002766940490000046
is a compensator S1The value of the impedance of (a) is,
Figure BDA0002766940490000047
is a compensator S1The value of the impedance of (a) is,
Figure BDA0002766940490000048
is a compensator S2The value of the impedance of (a) is,
Figure BDA0002766940490000049
to compensate for capacitance C1The capacity value of (a) is,
Figure BDA00027669404900000410
to compensate for capacitance C2The capacity value of (a) is,
Figure BDA00027669404900000411
for compensating inductance L1The sensitivity value of (a) to (b),
Figure BDA0002766940490000051
to compensate for the capacitance L2The sensitivity value of (a) to (b),
Figure BDA0002766940490000052
is a transmitting coil Lp1The inductance value of (a) is set,
Figure BDA0002766940490000053
is a transmitting coil Lp2Inductance value of, MppIs a transmitting coil Lp1And a transmitting coil Lp2Mutual inductance between M and LsAnd a transmitting coil Lp1And the receiving coil LsAnd a transmitting coil Lp2Mutual inductance value between, receiving coil LsAnd a transmitting coil Lp1Mutual inductance value of, receiving coil LsAnd a transmitting coil Lp2Mutual inductance values between them are equal, all areIn the case of M, the ratio of M,
Figure BDA0002766940490000054
is a receiving coil LsThe inductance value of (a) is set,
Figure BDA0002766940490000055
compensating the capacitance C for the receiving sidesThe capacity value of (a) is,
Figure BDA0002766940490000056
for high frequency inverter H1The current is output, and the current is output,
Figure BDA0002766940490000057
to compensate for capacitance C1A current is caused to flow through the electric current,
Figure BDA0002766940490000058
is a transmitting coil Lp1The current of (a) is measured,
Figure BDA0002766940490000059
for high frequency inverter H2The current is output, and the current is output,
Figure BDA00027669404900000510
to compensate for capacitance C2A current is caused to flow through the electric current,
Figure BDA00027669404900000511
is a transmitting coil Lp2The current of (2).
Based on the basic knowledge of the circuit, the high frequency inverter H1Fundamental component of output voltage
Figure BDA00027669404900000512
And the output voltage of the DC power supply
Figure BDA00027669404900000513
The relation of (A) is as follows:
Figure BDA00027669404900000514
in the formula (7), the reaction mixture is,
Figure BDA00027669404900000515
is a DC power supply E1The output voltage of (1).
Based on the basic knowledge of the circuit, the high frequency inverter H2Fundamental component of output voltage
Figure BDA00027669404900000516
And the output voltage of the DC power supply
Figure BDA00027669404900000517
The relation of (A) is as follows:
Figure BDA00027669404900000518
in the formula (8), the reaction mixture is,
Figure BDA00027669404900000519
is a DC power supply E2The output voltage of (1).
In the power supply circuit I and the power supply circuit II, in order to ensure that the power supply circuit I and the power supply circuit II have symmetrical structures, corresponding parameters in the circuits need to be equal, and the transmitting coil Lp1And a transmitting coil Lp1The parallel winding is symmetrical in structure, so that the electrical parameters in the system have the following relational expression:
Figure BDA00027669404900000520
in the formula (9), the reaction mixture is,
Figure BDA00027669404900000521
is a compensator S1The value of the impedance of (a) is,
Figure BDA00027669404900000522
is a compensator S2The value of the impedance of (a) is,
Figure BDA00027669404900000523
for supplementingCompensated capacitor C1The capacity value of (a) is,
Figure BDA00027669404900000524
to compensate for capacitance C2The capacity value of (a) is,
Figure BDA00027669404900000525
for compensating inductance L1The sensitivity value of (a) to (b),
Figure BDA00027669404900000526
to compensate for the capacitance L2The sensitivity value of (a) to (b),
Figure BDA00027669404900000527
is a transmitting coil Lp1The inductance value of (a) is set,
Figure BDA00027669404900000528
is a transmitting coil Lp2Inductance value of, Mp1sFor the receiving coil and the transmitting coil Lp1Mutual inductance value of, Mp2sFor the receiving coil and the transmitting coil Lp2The value of the mutual inductance of (a),
Figure BDA00027669404900000529
is a DC power supply E1The value of the output voltage is then calculated,
Figure BDA00027669404900000530
is a DC power supply E2The output voltage value of (1).
In order to keep the system in a resonance state, the electrical quantities of the system need to satisfy the following conditions:
Figure BDA0002766940490000061
in the formula (10), j is an imaginary symbol, ω is the system operating angular frequency,
Figure BDA0002766940490000062
is a compensator S1The value of the impedance of (a) is,
Figure BDA0002766940490000063
is a compensator S2The value of the impedance of (a) is,
Figure BDA0002766940490000064
to compensate for capacitance C1The capacity value of (a) is,
Figure BDA0002766940490000065
to compensate for capacitance C2The capacity value of (a) is,
Figure BDA0002766940490000066
for compensating inductance L1The sensitivity value of (a) to (b),
Figure BDA0002766940490000067
to compensate for the capacitance L2The sensitivity value of (a) to (b),
Figure BDA0002766940490000068
is a receiving coil LsThe inductance value of (a) is set,
Figure BDA0002766940490000069
compensating the capacitance C for the receiving sidesThe capacity value of (a) is,
Figure BDA00027669404900000610
is a transmitting coil Lp1The inductance value of (a) is set,
Figure BDA00027669404900000611
is a transmitting coil Lp2The inductance value of (a) is set,
Figure BDA00027669404900000612
is a transmitting coil Lp1The current of (a) is measured,
Figure BDA00027669404900000613
is a transmitting coil Lp2Current of (M)ppIs a transmitting coil Lp1And a transmitting coil Lp2Mutual inductance between them.
Due to the DC power supply E1Output voltage and DC power supply E2Are equal in value of output voltage, becauseThis adoption of
Figure BDA00027669404900000614
Indicating a direct current source E1And a DC power supply E2The output voltage of (d) is:
Figure BDA00027669404900000615
the transmitting coil L is obtained from the formulae (6), (7), (8), (9), (10) and (11)p1Current of
Figure BDA00027669404900000616
And a transmitting coil Lp2Current of
Figure BDA00027669404900000617
The expression of (a) is:
Figure BDA00027669404900000618
in the formula (12), the reaction mixture is,
Figure BDA00027669404900000619
is a DC power supply E1And a DC power supply
Figure BDA00027669404900000620
The output voltage value of (a) is a circumferential ratio, [ pi ] is a system operating angular frequency, [ omega ] is an imaginary number symbol,
Figure BDA00027669404900000621
is a compensator S1The value of the impedance of (a) is,
Figure BDA00027669404900000622
to compensate for capacitance C1The capacity value of (a) is,
Figure BDA00027669404900000623
is a compensator S2The value of the impedance of (a) is,
Figure BDA00027669404900000624
to compensate for capacitance C2The capacity value of (c).
Because the parameters of the electrical quantities of the power supply circuit I and the power supply circuit II are consistent, the transmitting coil Lp1Current of
Figure BDA00027669404900000625
And a transmitting coil Lp2Current of
Figure BDA0002766940490000071
Are identical in phase and amplitude, i.e.
Figure BDA0002766940490000072
Receiving coil LsInduced voltage of
Figure BDA0002766940490000073
The expression of (a) is:
Figure BDA0002766940490000074
in formula (13), M is a receiving coil LsAnd a transmitting coil Lp1And the receiving coil LsAnd a transmitting coil Lp2Mutual inductance value between, receiving coil LsAnd a transmitting coil Lp1Mutual inductance value of, receiving coil LsAnd a transmitting coil Lp2The mutual inductance values are equal, and are all M, omega is the angular frequency of system operation, j is an imaginary number symbol,
Figure BDA0002766940490000075
is a transmitting coil Lp1The current of (a) is measured,
Figure BDA0002766940490000076
is a transmitting coil Lp2The current of (2).
Due to the transmitting coil Lp1Current of
Figure BDA0002766940490000077
And a transmitting coil Lp2Current of
Figure BDA0002766940490000078
The amplitude and phase are identical, so the receiver coil induced voltage can be expressed as:
Figure BDA0002766940490000079
in the formula (14), j is an imaginary symbol, ω is the system operating angular frequency,
Figure BDA00027669404900000710
is a transmitting coil Lp1The current of (a) is measured,
Figure BDA00027669404900000711
is a transmitting coil Lp2M is the receiving coil LsAnd a transmitting coil Lp1And the receiving coil LsAnd a transmitting coil Lp2Mutual inductance value between, receiving coil LsAnd a transmitting coil Lp1Mutual inductance value of, receiving coil LsAnd a transmitting coil Lp2The mutual inductance values between the two groups are equal and are all M.
Receiving coil LsInduced voltage of
Figure BDA00027669404900000712
And system DC voltage VLThe relation of (A) is as follows:
Figure BDA00027669404900000713
in the formula (15), VLIs the set output dc voltage.
The compensator S of the power supply circuit I can be obtained from the equations (12), (14) and (15)1Impedance value of
Figure BDA00027669404900000714
And supply of powerCompensator S of circuit II2Impedance value of
Figure BDA00027669404900000715
Determined by equation (16):
Figure BDA00027669404900000716
in the formula (16), the compound represented by the formula,
Figure BDA00027669404900000717
is a DC power supply E1And a DC power supply
Figure BDA00027669404900000718
ω is the angular frequency of the system operation, j is the imaginary symbol, VLFor a set output DC voltage, M is the receiving coil LsAnd a transmitting coil Lp1And the receiving coil LsAnd a transmitting coil Lp2Mutual inductance value between, receiving coil LsAnd a transmitting coil Lp1Mutual inductance value of, receiving coil LsAnd a transmitting coil Lp2The mutual inductance values between the two groups are equal and are all M.
The compensation capacitor C in the power supply circuit I can be obtained from the formulas (12), (14) and (15)1Capacity of
Figure BDA00027669404900000719
And a compensation capacitor C in the power supply circuit II2Capacity of
Figure BDA00027669404900000720
Determined by equation (17):
Figure BDA0002766940490000081
in the formula (17), the compound represented by the formula (I),
Figure BDA0002766940490000082
is a DC power supply E1And a DC power supply
Figure BDA0002766940490000083
The output voltage value of omega is the angular frequency of system operation, VLFor a set output DC voltage, M is the receiving coil LsAnd a transmitting coil Lp1And the receiving coil LsAnd a transmitting coil Lp2Mutual inductance value between, receiving coil LsAnd a transmitting coil Lp1Mutual inductance value of, receiving coil LsAnd a transmitting coil Lp2The mutual inductance values between the two groups are equal and are all M.
According to the equations (10) and (17), the compensation inductance L of the power supply circuit I can be obtained1Inductance value of
Figure BDA0002766940490000084
And a compensation inductance L of the supply circuit II2Inductance value of
Figure BDA0002766940490000085
Determined by equation (18):
Figure BDA0002766940490000086
in the formula (18), the reaction mixture,
Figure BDA0002766940490000087
is a DC power supply E1And a DC power supply
Figure BDA0002766940490000088
Value of the output voltage VLFor a set output DC voltage, M is the receiving coil LsAnd a transmitting coil Lp1And the receiving coil LsAnd a transmitting coil Lp2Mutual inductance value between, receiving coil LsAnd a transmitting coil Lp1Mutual inductance value of, receiving coil LsAnd a transmitting coil Lp2The mutual inductance values between the two groups are equal and are all M.
For keeping the system in resonance, the transmitting coil Lp1Inductance value of
Figure BDA0002766940490000089
Transmitting coil Lp1And a transmitting coil Lp2Mutual inductance value M betweenppAnd a compensation capacitor Cp1Capacity of
Figure BDA00027669404900000810
The transmitting coil L needs to be maintained in a complete resonance statep2Inductance value of
Figure BDA00027669404900000811
Transmitting coil Lp1And a transmitting coil Lp2Mutual inductance value M betweenppAnd a compensation capacitor Cp1Capacity of
Figure BDA00027669404900000812
The need to maintain a full resonance state exists for the following relationship:
Figure BDA00027669404900000813
in the formula (19), j is an imaginary symbol, ω is the system operating angular frequency,
Figure BDA00027669404900000814
is a transmitting coil Lp1The sensitivity value of (a) to (b),
Figure BDA00027669404900000815
is a transmitting coil Lp2The sensitivity value of (a) to (b),
Figure BDA00027669404900000816
to compensate for capacitance Cp1The capacity value of (a) is,
Figure BDA00027669404900000817
to compensate for capacitance Cp2Capacity value of (M)ppIs a transmitting coil Lp1And a transmitting coil Lp2The mutual inductance value between them.
Due to the transmitting coil Lp1Current of
Figure BDA00027669404900000818
And a transmitting coil Lp2Current of
Figure BDA00027669404900000819
The amplitude and phase are completely equal, and a compensation capacitor C can be obtained according to the formula (19)p1Capacity of
Figure BDA00027669404900000820
And a compensation capacitor Cp2Capacity of
Figure BDA00027669404900000821
Determined by equation (20):
Figure BDA00027669404900000822
in the formula (20), ω is the system operating angular frequency,
Figure BDA0002766940490000091
is a transmitting coil Lp1The inductance value of (a) is set,
Figure BDA0002766940490000092
is a transmitting coil Lp2Inductance value of, MppIs a transmitting coil Lp1And a transmitting coil Lp2The mutual inductance value between them.
When the wireless power transmission system with double-end power supply performs double-end power supply, the power supply circuit I and the power supply circuit II simultaneously supply power to the transmitting coil P from two ends of the transmitting coil P. When the power supply circuit I is in fault, the controller K1Control the first cut-off switch Q1Closing, cutting off the power supply circuit I, and controlling the controller K2Controlling the second cut-off switch Q2And keeping the disconnection state, and independently supplying power to the wireless power transmission system with double-end power supply by a power supply circuit II. When the power supply circuit II is in fault, the controller K2Controlling the second cut-off switch Q1Closing, cutting off the power supply circuit II, and controlling the controller K1Control the first cut-off switch Q1Remaining off, with no supply from both endsThe line electric energy transmission system is independently powered by a power supply circuit I.
Compared with the prior art, the invention has the advantages that:
the power supply circuits of the wireless power transmission system with double-end power supply are respectively arranged at two ends of the transmitting coil, and the output power of the wireless power transmission system is provided by the power supply circuits at two ends of the transmitting coil, so that the power capacity of a single power supply circuit can be reduced, and the system cost is reduced.
Secondly, when the power supply circuit I has faults, the controller K1Control the first cut-off switch Q1Closed, the power supply circuit I is cut off, and the controller K2Controlling the second cut-off switch Q2And the disconnection state is kept, the power supply circuit II is controlled to independently supply power, and the system can normally run. If the power supply circuit II has a fault, the controller K2Controlling the second cut-off switch Q2Closed, power supply circuit II is cut off, controller K1Control the first cut-off switch Q1The disconnection state is kept, the power supply circuit I is controlled to supply power independently, and the system can run normally, so that fault removal is realized, and the reliability of the system is improved.
Drawings
The invention is further described with reference to the accompanying drawings and the detailed description;
FIG. 1 is a schematic circuit diagram of a dual-end-powered wireless power transmission system according to the present invention;
fig. 2 is a system equivalent circuit of a wireless power transmission system with double-end power supply when the wireless power transmission system with double-end power supply is powered;
FIG. 3 is a schematic diagram of a system circuit structure when the power supply circuit I independently supplies power when the power supply circuit II fails;
fig. 4 is a system equivalent circuit diagram when the power supply circuit I independently supplies power when the power supply circuit II fails.
Detailed Description
As shown in fig. 1, the wireless power transmission system with double-end power supply of the present invention is composed of a transmitting part and a receiving part; the receiving part comprises receiving coils L connected in series in sequenceSAnd a receiving side compensation capacitor CSRectifier filter circuit D and load RL(ii) a The transmitting section includes: DC power supply E1High frequency inverter H1Compensator S1And a compensation inductance L1And a compensation capacitor C1Sequentially connected to form a power supply circuit I; DC power supply E2High frequency inverter H2Compensator S2And a compensation inductance L2And a compensation capacitor C2And are connected in sequence to form a power supply circuit II. DC power supply E1And a DC power supply E2The power supply can be independent power supplies with equal voltage amplitude or connected into the same power supply. The power supply circuit I is connected with the transmitting coil P, the compensation capacitor C and the power supply circuit II in sequence to form a double-end power supply circuit, and the compensation capacitor C comprises a compensation capacitor Cp1And a compensation capacitor Cp2First cut-off switch Q1A first cut-off switch Q connected in parallel with the output of the supply circuit I1Terminal and controller K1Connecting; second cut-off switch Q2A second cut-off switch Q connected in parallel with the output of the supply circuit II2Control terminal and controller K2Are connected. When the wireless power transmission system with double-end power supply carries out double-end power supply, the first cut-off switch Q1And a second cut-off switch Q2Maintaining the off state, high frequency inverter H1And a high frequency inverter H2And simultaneously supplying power and outputting voltage with 180-degree phase difference.
The transmitting coil P comprises two parts: transmitting coil Lp1And a transmitting coil Lp2And two transmitting coils are wound in parallel. Transmitting coil Lp1Is connected with one end of a power supply circuit I, a transmitting coil Lp1Another terminal of (1) and a compensation capacitor Cp1And the other end of the power supply circuit II is connected with the other end of the power supply circuit II after being connected in series. Transmitting coil Lp2Is connected with the other end of the power supply circuit I, and a transmitting coil Lp2Another terminal of (1) and a compensation capacitor Cp2And the other end of the power supply circuit II is connected with the other end of the power supply circuit II after being connected in series.
In the wireless power transmission system with double-end power supply, when the power supply circuit I has a fault, the controller K1Control the first cut-off switch Q1Closing, cutting off the power supply circuit I, and controlling the controller K2Controlling the second cut-off switch Q2Keeping the disconnection state, and independently supplying power to the wireless power transmission system with double-end power supply by a power supply circuit II; when the power supply circuit II is in fault, the controller K2Controlling the second cut-off switch Q2Closing, cutting off the power supply circuit II, and controlling the controller K1Control the first cut-off switch Q1And keeping the disconnection state, and independently supplying power to the wireless power transmission system with double-end power supply by a power supply circuit I.
Fig. 2 is a system equivalent circuit of a wireless power transmission system with double-end power supply. In FIG. 2, S1Compensators for the supply circuit I, C1A compensation capacitor for the supply circuit I, L1Compensating inductances, S, for supply circuits I2Compensators for supply circuits II, C2A compensation capacitor for the supply circuit II, L2Compensating inductances, L, for supply circuits IIsTo receive coils, CsFor compensating the capacitance at the receiving side, ReThe system is an alternating current equivalent load.
Figure BDA0002766940490000101
For high frequency inverter H1The fundamental component of the output voltage of (a),
Figure BDA0002766940490000102
for high frequency inverter H1The current is output, and the current is output,
Figure BDA0002766940490000103
to compensate for capacitance C1The current of (a) is measured,
Figure BDA0002766940490000104
is a transmitting coil Lp1The current of (a) is measured,
Figure BDA0002766940490000105
for high frequency inverter H2The fundamental component of the output voltage of (a),
Figure BDA0002766940490000106
for high frequency inverter H2The current is output, and the current is output,
Figure BDA0002766940490000107
to compensate for capacitance C2The current of (a) is measured,
Figure BDA0002766940490000108
is a transmitting coil Lp2The current of (a) is measured,
Figure BDA0002766940490000109
to receive the coil current.
Fig. 3 is a schematic diagram of a system circuit structure when the power supply circuit II fails and the power supply circuit I independently supplies power. In FIG. 3, E1Is a DC power supply, S1Compensators for the supply circuit I, C1A compensation capacitor for the supply circuit I, L1Compensating inductances, L, for supply circuits Ip1Is a transmitting coil, Lp2For the transmitting coil, the transmitting coil Lp1And a transmitting coil Lp2And (4) parallel winding. L issTo receive coils, CsFor compensating the capacitance at the receiving side, RLIs the system load resistance.
Fig. 4 is a system equivalent circuit diagram when the power supply circuit I independently supplies power when the power supply circuit II fails. In the context of figure 4, it is shown,
Figure BDA00027669404900001010
for the fundamental component of the inverter output voltage, S1Compensators for the supply circuit I, C1A compensation capacitor for the supply circuit I, L1Compensating inductances, L, for supply circuits Ip1Is a transmitting coil, Lp2For the transmitting coil, the transmitting coil Lp1And a transmitting coil Lp2And (4) parallel winding. L issTo receive coils, CsFor compensating the capacitance at the receiving side, ReIn order to exchange the equivalent load for the system,
Figure BDA00027669404900001011
for high frequency inverter H1The current is output, and the current is output,
Figure BDA0002766940490000111
to compensate for capacitance C1The current of (a) is measured,
Figure BDA0002766940490000112
is a transmitting coil Lp1The current of (a) is measured,
Figure BDA0002766940490000113
to receive the coil current.
In this embodiment:
the first cut-off switch Q1And a second cut-off switch Q2Simultaneous disconnection, high frequency inverter H1And a high frequency inverter H2And meanwhile, power is supplied, the two sets of high-frequency inverters have the same working frequency, the phase difference of output voltages is 180 degrees, and the wireless power transmission system with double-end power supply realizes double-end power supply. The compensator S1Impedance value of
Figure BDA0002766940490000114
And a compensator S2Impedance value of
Figure BDA0002766940490000115
Determined by equation (1):
Figure BDA0002766940490000116
the compensation inductance L1Inductance value of
Figure BDA0002766940490000117
And a compensation inductance L2Inductance value of
Figure BDA0002766940490000118
Determined by equation (2):
Figure BDA0002766940490000119
the compensation capacitor C1Capacity of
Figure BDA00027669404900001110
And a compensation capacitor C2Capacity of
Figure BDA00027669404900001111
Determined by equation (3):
Figure BDA00027669404900001112
the compensation capacitor Cp1Capacity of
Figure BDA00027669404900001113
Determined by equation (4):
Figure BDA00027669404900001114
the compensation capacitor Cp2Capacity of
Figure BDA00027669404900001115
Determined by equation (5):
Figure BDA00027669404900001116
in the formula (1), the formula (2), the formula (3), the formula (4) and the formula (5),
Figure BDA00027669404900001117
DC power supply E1And a DC power supply E2Value of the output voltage VLSetting voltage for DC output of receiving side, where omega is angular frequency of system operation, and M is receiving coil LsAnd a transmitting coil Lp1And the receiving coil LsAnd a transmitting coil Lp2Mutual inductance value between, receiving coil LsAnd a transmitting coil Lp1Mutual inductance value of, receiving coil LsAnd a transmitting coil Lp2The mutual inductance values between the two groups are equal and are all M,
Figure BDA00027669404900001118
is a transmitting coil Lp1The inductance value of (a) is set,
Figure BDA00027669404900001119
is a transmitting coil Lp2Inductance value of, MppIs a transmitting coil Lp1And a transmitting coil Lp2Mutual inductance between them.

Claims (4)

1. A wireless power transmission system with double-end power supply is composed of a transmitting part and a receiving part, and is characterized in that: the receiving part comprises receiving coils L which are connected in series in sequenceSAnd a receiving side compensation capacitor CSRectifier filter circuit D and load RL(ii) a The transmitting part comprises: DC power supply E1High frequency inverter H1Compensator S1And a compensation inductance L1And a compensation capacitor C1T-shaped power supply circuit I and direct-current power supply E which are sequentially connected2High frequency inverter H2Compensator S2And a compensation inductance L2And a compensation capacitor C2The T-shaped power supply circuit II, the transmitting coil P and the compensating capacitor C are sequentially connected; DC power supply E1And a DC power supply E2The compensation capacitor C comprises a compensation capacitor C for outputting independent power supplies with equal voltage amplitudes or connecting the same power supplyp1And a compensation capacitor Cp2(ii) a First cut-off switch Q1Connected in parallel with the output of the supply circuit I, a first cut-off switch Q1Control terminal and controller K1Connecting; second cut-off switch Q2A second cut-off switch Q connected in parallel with the output of the supply circuit II2Control terminal and controller K2Connecting; when the wireless power transmission system carries out double-end power supply, the first cut-off switch Q1And a second cut-off switch Q2Simultaneous disconnection, high frequency inverter H1And a high frequency inverter H2Simultaneous power supply, high frequency inverter H1And a high frequency inverter H2The operating frequencies are equal and the output voltages are 180 degrees out of phase.
2. The dual-ended power wireless power transfer system of claim 1, whereinThe method comprises the following steps: the transmitting coil P comprises a transmitting coil Lp1And a transmitting coil Lp2The two transmitting coils are wound in parallel; transmitting coil Lp1One end of (1) and a compensation inductance L in the power supply circuit I1Is connected to the output terminal of the transmitting coil Lp1Another terminal of (1) and a compensation capacitor Cp1High-frequency inverter H connected in series with power supply circuit II2And a compensation capacitor C2Are connected; transmitting coil Lp2And a high-frequency inverter H in the power supply circuit I1And a compensation capacitor C1Are connected to a common point, a transmitting coil Lp2Another terminal of (1) and a compensation capacitor Cp2Compensating inductance L in series connection and power supply circuit II2The output ends of the two are connected.
3. The dual-ended powered wireless power transfer system of claim 1, wherein: the compensator S1Impedance value of
Figure FDA0002766940480000011
And a compensator S2Impedance value of
Figure FDA0002766940480000012
Determined by equation (1):
Figure FDA0002766940480000013
the compensation inductance L1Inductance value of
Figure FDA0002766940480000014
And a compensation inductance L2Inductance value of
Figure FDA0002766940480000015
Determined by equation (2):
Figure FDA0002766940480000016
the compensation capacitor C1Capacity of
Figure FDA0002766940480000017
And a compensation capacitor C2Capacity of
Figure FDA0002766940480000018
Determined by equation (3):
Figure FDA0002766940480000019
the compensation capacitor Cp1Capacity of
Figure FDA00027669404800000110
Determined by equation (4):
Figure FDA0002766940480000021
the compensation capacitor Cp2Capacity of
Figure FDA0002766940480000022
Determined by equation (5):
Figure FDA0002766940480000023
in the formula (1), the formula (2), the formula (3), the formula (4) and the formula (5),
Figure FDA0002766940480000024
is a DC power supply E1And a DC power supply E2Value of the output voltage VLSetting voltage for DC output of receiving side, where omega is angular frequency of system operation, and M is receiving coil LsAnd a transmitting coil Lp1And the receiving coil LsAnd a transmitting coil Lp2Mutual inductance value between, receiving coil LsAnd a transmitting coil Lp1Mutual inductance value of, receiving coil LsAnd a transmitting coil Lp2The mutual inductance values between the two groups are equal and are all M,
Figure FDA0002766940480000025
is a transmitting coil Lp1The inductance value of (a) is set,
Figure FDA0002766940480000026
is a transmitting coil Lp2Inductance value of, MppIs a transmitting coil Lp1And a transmitting coil Lp2J is an imaginary symbol.
4. The dual-ended powered wireless power transfer system of claim 1, wherein: when the power supply circuit I is in fault, the controller K1Control the first cut-off switch Q1Closing, cutting off the power supply circuit I, and controlling the controller K2Controlling the second cut-off switch Q2Keeping the disconnection state, and independently supplying power to the wireless power transmission system with double-end power supply by a power supply circuit II; when the power supply circuit II is in fault, the controller K2Controlling the second cut-off switch Q2Closing, cutting off the power supply circuit II, and controlling the controller K1Control the first cut-off switch Q1And keeping the disconnection state, and independently supplying power to the wireless power transmission system with double-end power supply by a power supply circuit I.
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CN109245231A (en) * 2018-10-29 2019-01-18 浙江大学 A kind of wireless charging topological structure with nature constant pressure and flow output characteristics

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150015197A1 (en) * 2013-07-11 2015-01-15 The Regents Of The University Of Michigan Double-sided lcc compensation method for wireless power transfer
CN106208414A (en) * 2016-08-05 2016-12-07 西南交通大学 The inductive electric energy transmission system of energy many primary coils of resonance compensation automatically
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