Power decoupling dual-load hybrid wireless power transmission system

Abstract

The invention discloses a dual-load hybrid wireless power transmission system with power decoupling. The dual-load hybrid wireless power transmission system comprises a high-frequency inversion module, a hybrid coupling mechanism, a same-side decoupling compensation circuit, an S-S compensation circuit and a rectification filtering module. The coupling mechanism is formed by integrating two groups of horizontal four-pole-plate coupling mechanisms and two groups of horizontal square coil coupling mechanisms, and mutual impedance of pole plates and mutual impedance of different sides of coils are counteracted, so that different-side decoupling and main mutual impedance superposition are realized, and the transmission power is increased. The same-side decoupling compensation circuit adopts a connection mode that the same potential position of the input side and the same potential position of the output side are connected in series, so that an equivalent excitation voltage source of the same-side decoupling compensation circuit is counteracted with an equivalent excitation voltage source coupled at the same side of the system, and same-side decoupling of the system is realized. And the S-S compensation circuit adopts a connection mode that the input side independent side and the output side independent side are connected in series, so that the constant current output of the system is realized. Compared with the prior art, the problems of same-side coupling and different-side coupling of the system are considered at the same time, and independent operation of all channels of the system is achieved.

Description

Technical Field

[0001] The present invention belongs to the field of wireless power transmission technology, and particularly relates to a dual-load hybrid wireless power transmission system with power decoupling. Background Art

[0002] At present, the research on power decoupling of existing dual-load wireless power transmission systems only solves the same-side coupling between the input sides and between the output sides of the system. However, in practical applications, when a certain load does not require power supply, the disconnection of its corresponding power supply will affect the power output of other loads, resulting in the failure of the decoupling strategy and the inability to achieve independent operation of each power transmission channel. Especially in the case where the load power levels vary greatly, when a certain load power supply is disconnected, the phenomenon that the output power of other loads deviates from the rated power value is particularly significant. Therefore, it is highly necessary to design a dual-load wireless power transmission system that can achieve both same-side and cross-side decoupling to ensure that the two loads can output power independently and stably. Summary of the Invention

[0003] The object of the present invention is to design a dual-load hybrid wireless power transmission system with power decoupling. To achieve the above object, the technical solution adopted by the present invention is as follows:

[0004] The dual-load hybrid wireless power transmission system with power decoupling includes: 2 high-frequency full-bridge inverters, a coupling mechanism with cross-side decoupling conditions, 4 independent external capacitors C ex1 , C ex2 , C ex3 , C ex4 , a same-side decoupling compensation circuit, an S-S compensation circuit, 2 full-bridge rectifiers, and 2 load resistors R L3 , R L4 . The input DC voltages of the two inverters are U dc1 and U dc2 respectively, the operating angular frequencies are both ω, and the output fundamental voltages are U1 and U2 respectively.

[0005] The coupling mechanism with cross-side decoupling conditions is composed of an electric field coupling part and a magnetic coupling part. The electric field coupling part includes two groups of mutually symmetric horizontal four-pole plates, and the magnetic coupling part includes two groups of square transmitting and receiving coils embedded inside the plates. The transmitting plates are coplanar four-pole plates, including the first pair of transmitting plates P1, P2 and the second pair of transmitting plates P3, P4; the receiving plates are coplanar four-pole plates, including the first pair of receiving plates P5, P6 and the second pair of receiving plates P7, P8. The transmitting coils are two coplanar coils, namely transmitting coil L1 and transmitting coil L2; the receiving coils are two coplanar coils, namely receiving coil L3 and receiving coil L4. The mutual capacitance between any two plates P i , P j is denoted as Cm,n is represented, where m, n = 1, 2, 3, 4, 5, 6, 7, 8. The self-inductance of the coil is represented by L a is represented, and the mutual inductance between any two coils L a and L b is represented by M ab , where a, b = 1, 2, 3, 4, a ≠ b.

[0006] The four independent external capacitors C ex1 and C ex2 and C ex3 and C ex4 of the power decoupled dual-load hybrid wireless power transfer system, where the capacitor C ex1 is connected in parallel on both sides of the plates P1 and P2, the capacitor C ex2 is connected in parallel on both sides of the plates P3 and P4, the capacitor C ex3 is connected in parallel on both sides of the plates P5 and P6, and the capacitor C ex4 is connected in parallel on both sides of the plates P7 and P8. The plates P1 and P2 of the electric field part in the coupling mechanism and the independent external capacitor C ex1 connected in parallel on both sides of the plates form the input port 1, the plates P3 and P4 and the independent external capacitor C ex2 connected in parallel on both sides of the plates form the input port 2, the plates P5 and P6 and the independent external capacitor C ex3 connected in parallel on both sides of the plates form the output port 3, and the plates P7 and P8 and the independent external capacitor C ex4 connected in parallel on both sides of the plates form the output port 4.

[0007] The same-side decoupling compensation circuit of the power decoupled dual-load hybrid wireless power transfer system is two independent impedance elements X p and X s , where one end of X p is connected to the same-potential end of the transmitting plates P2 and P3, and the other end is connected to the negative-potential end of the output voltages U1 and U2 of the inverter; one end of X s is connected to the same-potential end of the receiving plates P6 and P7, and the other end is connected to the negative-potential end of the output voltages U3 and U4 before rectification. The independent impedance elements X p and X s must be selected according to the equivalent model of the hybrid coupling mechanism. If the hybrid coupling mechanism is capacitive, the equivalent model of the hybrid coupling mechanism is the electric field coupling model, and the same-side decoupling compensation circuit is two independent inductors L p and L s ; if the hybrid coupling mechanism is inductive, the equivalent model of the hybrid coupling mechanism is the magnetic field coupling model, and the same-side decoupling compensation circuit is two independent capacitors C p and C s .

[0008] The SS compensation circuit of the power decoupled dual-load hybrid wireless power transmission system is composed of four independent impedance elements X e1 , X e2 , X e3 , X e4 , where X e1 One end is connected to the end of the coil L1 close to the input voltage, and the other end is connected to the positive potential end of the inverter output voltage U1; X e2 One end is connected to the end of coil L2 close to the input voltage, and the other end is connected to the positive potential end of the inverter output voltage U2; X e3 One end is connected to the end of the coil L3 close to the input voltage, and the other end is connected to the positive potential end of the output voltage U3 before rectification; X e4 One end is connected to the end of the coil L4 close to the input voltage, and the other end is connected to the positive potential end of the output voltage U4 before rectification. e1 , X e2 , X e3 , X e4 The selection must be made based on the equivalent model of the hybrid coupling mechanism. If the hybrid coupling mechanism is capacitive, the equivalent model of the hybrid coupling mechanism is an electric field coupling model. The SS compensation circuit is composed of four independent inductors L e1 , L e2 , L e3 , L e4 If the hybrid coupling mechanism is inductive, the equivalent model of the hybrid coupling mechanism is a magnetic field coupling model, and the same-side decoupling compensation circuit is composed of four independent capacitors C e1 , C e2 , C e3 , C e4 .

[0009] The Π-type equivalent circuit of the electric field coupling mechanism of the power decoupled dual-load hybrid wireless power transmission system, wherein C in1 is the self capacitance of input port 1, C in2 is the self capacitance of input port 2, C out3 is the self capacitance of output port 3, C out4 is the self capacitance of output port 4, C m,p1p2p5p6 is the main coupling equivalent mutual capacitance between input port 1 and output port 3, C m,p3p4p7p8 is the main coupling mutual capacitance between input port 2 and output port 4, C m,p1p2p3p4 is the mutual capacitance of the same side coupling between input port 1 and input port 2, C m,p5p6p7p8 is the mutual capacitance of the same side coupling between output port 3 and output port 4, C m,p1p2p7p8 is the opposite-side coupling mutual capacitance between input port 1 and output port 4, C m,p3p4p5p6is the mutual capacitance of the opposite-side coupling between the input port 2 and the output port 3. Where U c1 , U c2 , U c3 , U c4 are the voltages across the four ports respectively, and the port equivalent mutual capacitances C m,1,1 , C m,2,1 , C m,1,2 , C m,2,2 of the input port 1, input port 2, output port 3 and output port 4 are respectively expressed as:

[0010]

[0011] The admittance matrix Y c of the Π-type equivalent circuit of the electric field coupling mechanism is:

[0012]

[0013] The impedance matrix Z c of the electric field coupling mechanism can be expressed as:

[0014] Z c = Y c -1 (3)

[0015] According to the two-port network characteristics of the electric field coupling mechanism, it can be transformed into an equivalent excitation voltage source model. The element in the i-th row and j-th column of the impedance matrix Z c is defined as 1 / jωC ij , and the impedance matrix can be expressed as:

[0016]

[0017] For the magnetic field coupling mechanism of the power decoupling two-load hybrid wireless power transmission system, an input port 1 is formed at both ends of the coil L1, an input port 2 is formed at both ends of L2, an output port 3 is formed at both ends of L3, and an output port 4 is formed at both ends of L4. According to the two-port network characteristics of the coupling mechanism, the impedance matrix Z i of its equivalent excitation voltage source model can be expressed as:

[0018]

[0019] The magnetic field energy transmission channel and the electric field energy transmission channel of the power decoupling double-load hybrid wireless power transmission system are in series relationship. Therefore, the equivalent excitation voltage source model of the hybrid coupling mechanism of this system is the series connection of the equivalent excitation voltage source model of the magnetic field coupling mechanism and the equivalent excitation voltage source model of the electric field coupling mechanism. Therefore, without considering the conditions satisfied by each element of the compensation network, the overall loop current matrix of the system can be obtained:

[0020]

[0021] Among them, U1 is the AC output voltage of the high-frequency full-bridge inverter on the first system input side, U2 is the AC output voltage of the high-frequency full-bridge inverter on the second system input side, I1 is the AC output current of the high-frequency full-bridge inverter on the first system input side, I2 is the AC output current of the high-frequency full-bridge inverter on the second system input side, I3 is the AC output current before rectification on the third system output side, I4 is the AC output current before rectification on the fourth system output side, jX ii = jωL i + 1 / jωC ii ; jX ij = ±jωM ij + 1 / jωC ij , i ≠ j, where when jX ij is the sub-diagonal element, take +, and when jX ij is other elements, take -.

[0022] For the hybrid coupling mechanism of the power decoupled dual-load hybrid wireless power transfer system, by adjusting the plate and coil parameters, the off-side impedances in the coupling mechanism are cancelled out, that is:

[0023]

[0024] For the same-side decoupling compensation impedance elements X p and X s of the power decoupled dual-load hybrid wireless power transfer system, the following conditions must be satisfied:

[0025]

[0026] For the parameters of the S-S compensation impedance elements X e1 , X e2 , X e3 , X e4 of the power decoupled dual-load hybrid wireless power transfer system, they respectively satisfy the following conditions:

[0027]

[0028] Thus, the loop current matrix obtained from Equation (6) is simplified as follows:

[0029]

[0030] From Equation (10), the output currents I3 and I4 of the system are respectively:

[0031]

[0032] Through the above parameter and structure design, the output current of the circuit is constant and does not change with the change of the load. Moreover, the circuit output is only related to the power main coupling impedance corresponding to each transmission channel and will not be affected by other input or output sides.

[0033] Compared with the prior art, the remarkable advantages of the present invention are as follows: The present invention integrates a dual-load magnetic coupling mechanism and an electric field coupling mechanism, and uses the magnetic field and the electric field coupling mechanism to transfer energy simultaneously, thereby improving the transmission power of the system; by utilizing the cross-coupled mutual capacitance of the electric field coupling mechanism and the cross-coupled mutual inductance resonance in the magnetic field coupling mechanism, the cross-coupling on the opposite sides of the system is eliminated; by utilizing the resonance of the mutual capacitance and mutual inductance of the compensation element and the same-side coupling of the hybrid coupling mechanism, the cross-coupling on the same side of the system is eliminated; it can be widely applied to application scenarios with multiple loads. When a certain load does not require power supply, the output to other loads will not be affected.

[0034] The following will be described in detail with reference to the embodiments and the accompanying drawings. Description of the Drawings

[0035] Figure 1 It is a topological structure of a power-decoupled dual-load hybrid wireless power transmission system;

[0036] Figure 2 It is a coupling mechanism of a power-decoupled dual-load hybrid wireless power transmission system;

[0037] Figure 3 It is a Π-type equivalent circuit of an electric field coupling mechanism of a power-decoupled dual-load hybrid wireless power transmission system;

[0038] Figure 4 It is an equivalent controlled source circuit of a power-decoupled dual-load hybrid wireless power transmission system;

[0039] Figure 5 It is a simplified equivalent controlled source circuit of a power-decoupled dual-load hybrid wireless power transmission system;

[0040] Figure 6 It is a dimension diagram of a coupling mechanism of a power-decoupled dual-load hybrid wireless power transmission system;

[0041] Figure 7 It is a diagram of the output current varying with the load when the input power supply of a power-decoupled dual-load hybrid wireless power transmission system is operating normally;

[0042] Figure 8 It is a diagram of the output current after the power supply of the input side 2 of a power-decoupled dual-load hybrid wireless power transmission system is open-circuited;

[0043] Figure 9Output current diagram after the input - side 1 power supply of a power - decoupled dual - load hybrid wireless power transfer system is cut off.

[0044] Specific implementation mode

[0045] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0046] As Figure 1 shown, the power - decoupled two - load hybrid wireless power transfer system includes: two high - frequency full - bridge inverters, a coupling mechanism with cross - side decoupling conditions, four independent externally - connected capacitors C ex1 , C ex2 , C ex3 , C ex4 , a same - side decoupling compensation circuit, an S - S compensation circuit, two full - bridge rectifiers, and two load resistors R L3 , R L4 . The input DC voltages of the two inverters are U dc1 and U dc2 respectively, the operating angular frequency is ω, and the output fundamental voltages are U1 and U2.

[0047] As Figure 2 shown, the coupling mechanism with cross - side decoupling conditions consists of an electric - field coupling part and a magnetic - field coupling part. The electric - field coupling part includes two groups of symmetric horizontal four - plate electrodes, and the magnetic - field coupling part includes two groups of square transmitting and receiving coils embedded inside the electrodes. The transmitting electrode plates are coplanar four - plate electrodes, including the first pair of transmitting electrode plates P1, P2 and the second pair of transmitting electrode plates P3, P4; the receiving electrode plates are coplanar four - plate electrodes, including the first pair of receiving electrode plates P5, P6 and the second pair of receiving electrode plates P7, P8. The transmitting coils are two coplanar coils, namely transmitting coil L1 and transmitting coil L2; the receiving coils are two coplanar coils, namely receiving coil L3 and receiving coil L4. The mutual capacitance between any two electrode plates P i , P j is represented by C m,n , where m,n = 1,2,3,4,5,6,7,8. The self - inductance of the coil is represented by L a , and the mutual inductance between any two coils L a , L b is represented by M ab , where a,b = 1,2,3,4,a≠b.

[0048] The four independent externally - connected capacitors C ex1 , C ex2 , C ex3 , C ex4 of the power - decoupled dual - load hybrid wireless power transfer system, where the capacitor C ex1Connected in parallel on both sides of the plates P1 and P2, capacitor C ex2 Connected in parallel on both sides of the plates P3 and P4, capacitor C ex3 Connected in parallel on both sides of the plates P5 and P6, capacitor C ex4 Connected in parallel on both sides of the plates P7 and P8. The plates P1 and P2 of the electric field part in the coupling mechanism and the independent external capacitor C connected in parallel on both sides of the plates ex1 Form input port 1, the plates P3 and P4 and the independent external capacitor C connected in parallel on both sides of the plates ex2 Form input port 2, the plates P5 and P6 and the independent external capacitor C connected in parallel on both sides of the plates ex3 Form output port 3, the plates P7 and P8 and the independent external capacitor C connected in parallel on both sides of the plates ex4 Form output port 4.

[0049] The same-side decoupling compensation circuit of the power decoupling dual-load hybrid wireless power transmission system is two independent impedance elements X p and X s , where one end of X p is connected to the same-potential end of the transmitting plates P2 and P3, and the other end is connected to the negative-potential end of the inverter output voltages U1 and U2; one end of X s is connected to the same-potential end of the receiving plates P6 and P7, and the other end is connected to the negative-potential end of the output voltages U3 and U4 before rectification. The independent impedance elements X p and X s must be selected according to the equivalent model of the hybrid coupling mechanism. If the hybrid coupling mechanism is capacitive, the equivalent model of the hybrid coupling mechanism is the electric field coupling model, and the same-side decoupling compensation circuit is two independent inductors L p , L s ; if the hybrid coupling mechanism is inductive, the equivalent model of the hybrid coupling mechanism is the magnetic field coupling model, and the same-side decoupling compensation circuit is two independent capacitors C p , C s .

[0050] The S-S compensation circuit of the power decoupling dual-load hybrid wireless power transmission system is four independent impedance elements X e1 , X e2 , X e3 , X e4 , where one end of X e1 is connected to the end of the coil L1 close to the input voltage, and the other end is connected to the positive-potential end of the inverter output voltage U1; one end of X e2 is connected to the end of the coil L2 close to the input voltage, and the other end is connected to the positive-potential end of the inverter output voltage U2; one end of X e3One end is connected to the end of coil L3 close to the input voltage, and the other end is connected to the positive potential end of the output voltage U3 before rectification; X e4 One end is connected to the end of coil L4 close to the input voltage, and the other end is connected to the positive potential end of the output voltage U4 before rectification. The independent impedance element X e1 、X e2 、X e3 、X e4 shall be selected according to the equivalent model of the hybrid coupling mechanism. If the hybrid coupling mechanism is capacitive, the equivalent model of the hybrid coupling mechanism is the electric field coupling model, and the S-S compensation circuit is 4 independent inductors L e1 、L e2 、L e3 、L e4 ; if the hybrid coupling mechanism is inductive, the equivalent model of the hybrid coupling mechanism is the magnetic field coupling model, and the same-side decoupling compensation circuit is 4 independent capacitors C e1 、C e2 、C e3 、C e4 .

[0051] As Figure 3 shown, the Π-type equivalent circuit of the electric field coupling mechanism of the power decoupled dual-load hybrid wireless power transfer system, where C in1 is the self-capacitance of input port 1, C in2 is the self-capacitance of input port 2, C out3 is the self-capacitance of output port 3, C out4 is the self-capacitance of output port 4, C m,p1p2p5p6 is the main coupling equivalent mutual capacitance between input port 1 and output port 3, C m,p3p4p7p8 is the main coupling mutual capacitance between input port 2 and output port 4, C m,p1p2p3p4 is the same-side coupling mutual capacitance between input port 1 and input port 2, C m,p5p6p7p8 is the same-side coupling mutual capacitance between output port 3 and output port 4, C m,p1p2p7p8 is the cross-side coupling mutual capacitance between input port 1 and output port 4, C m,p3p4p5p6 is the cross-side coupling mutual capacitance between input port 2 and output port 3. Where U c1 、U c2 、U c3 、U c4 are the voltages across the four ports respectively, and the port equivalent mutual capacitances C m,1,1 、C m,2,1 、C m,1,2 、C m,2,2 of input port 1, input port 2, output port 3 and output port 4 are respectively expressed as:

[0052]

[0053] The admittance matrix Y of the Π - type equivalent circuit of the electric - field coupling mechanism c is as follows:

[0054]

[0055] The impedance matrix Z of the electric - field coupling mechanism c can be expressed as:

[0056] Z c =Y c -1 (14)

[0057] According to the two - port network characteristics of the electric - field coupling mechanism, it can be transformed into an equivalent excitation voltage - source model. Define the element in the i - th row and j - th column of the impedance matrix Z c as 1 / jωC ij , and the impedance matrix can be expressed as:

[0058]

[0059] For the magnetic - field coupling mechanism of the described two - load hybrid wireless power transfer system with power decoupling, an input port 1 is formed at both ends of coil L1, an input port 2 is formed at both ends of L2, an output port 3 is formed at both ends of L3, and an output port 4 is formed at both ends of L4. According to the two - port network characteristics of the coupling mechanism, the impedance matrix Z of its equivalent excitation voltage - source model i can be expressed as:

[0060]

[0061] For the described two - load hybrid wireless power transfer system with power decoupling, the magnetic - field energy transfer channel and the electric - field energy transfer channel are in series. Therefore, the equivalent excitation voltage - source model of the hybrid coupling mechanism of this system is the series connection of the equivalent excitation voltage - source model of the magnetic - field coupling mechanism and the equivalent excitation voltage - source model of the electric - field coupling mechanism. Therefore, without considering the conditions satisfied by each element of the compensation network, the overall loop - current matrix of the system can be obtained:

[0062]

[0063] where U1 is the AC output voltage of the high - frequency full - bridge inverter on the input side 1 of the system, U2 is the AC output voltage of the high - frequency full - bridge inverter on the input side 2 of the system, I1 is the AC output current of the high - frequency full - bridge inverter on the input side 1 of the system, I2 is the AC output current of the high - frequency full - bridge inverter on the input side 2 of the system, I3 is the AC output current before rectification on the output side 3 of the system, I4 is the AC output current before rectification on the output side 4 of the system, jX ii =jωL i +1 / jωC ii ; jXij = jωM ij + 1 / jωC ij , i ≠ j

[0064] The hybrid coupling mechanism of the power decoupled dual-load hybrid wireless power transfer system makes the impedance on the opposite sides in the coupling mechanism cancel each other out by adjusting the parameters of the plates and coils, that is:

[0065]

[0066] The same-side decoupling compensation impedance elements X p and X s of the power decoupled dual-load hybrid wireless power transfer system must satisfy the following conditions:

[0067]

[0068] The parameters of the S-S compensation impedance elements X e1 , X e2 , X e3 , X e4 of the power decoupled dual-load hybrid wireless power transfer system S-S must satisfy the following conditions respectively:

[0069]

[0070] Thus, the loop current matrix obtained from Equation (17) is simplified as follows:

[0071]

[0072] It can be obtained from Equation (21) that the output currents I3 and I4 of the system are respectively:

[0073]

[0074] Through the above parameter and structure design, the output current of the circuit is constant and does not change with the change of the load, and the circuit output is only related to the power main coupling impedance corresponding to its respective transmission channel and will not be affected by other input or output sides.

[0075] Compared with the prior art, the remarkable advantages of the present invention are: the present invention integrates the dual-load magnetic coupling mechanism and the electric field coupling mechanism, uses the magnetic field and the electric field coupling mechanism to transfer energy simultaneously, and improves the transmission power of the system; uses the cross-coupled mutual capacitance of the electric field coupling mechanism and the cross-coupled mutual inductance resonance in the magnetic field coupling mechanism to eliminate the cross-coupling on the opposite sides of the system; uses the mutual capacitance and mutual inductance resonance of the compensation element and the same-side coupling of the hybrid coupling mechanism to eliminate the cross-coupling on the same side of the system; can be extended and applied to application scenarios with multiple loads, and when a certain load does not need power supply, the output to other loads will not be affected.

[0076] Example: Analysis of Simulation Results

[0077] A coupling mechanism model is built in a finite element simulation software. The sizes of the coils and plates on the input side 1, input side 2, and output side 4 are the same, while the sizes of the coils and plates on the output side 3 are different from the previous three. As Figure 6 shown, the left figure is the size diagram of the coils and plates on the output side 3, the right figure is the size diagram of the coils and plates on the input side 1, input side 2, and output side 4, and the lower figure is the front view of the hybrid coupling mechanism. The plates have holes on the inner side for placing coils. For the input side 1, input side 2, and output side 4, the outer width D of the plate is 0.35 m, the outer height H of the plate is 0.2 m, and the inner width D of the plate after opening the holes m is 0.25 m, and the inner height H of the plate m is 0.15 m. The outer width L of the coil is 0.2 m, and the outer height L of the coil H is 0.25 m, and the inner width L of the coil m is 0.1 m, and the inner height L of the coil Hm is 0.15 m. The thickness of the plate and the coil d is 2 mm. The coil and the plate are placed coplanarly, and the diagonal of the coil is collinear with the diagonal of the plate. For the output side 3, the outer width D3 of the plate is 0.33 m, the outer height H3 of the plate is 0.18 m, and the inner width D of the plate after opening the holes m3 is 0.24 m, and the inner height H of the plate m3 is 0.14 m. The outer width L3 of the coil is 0.17 m, and the outer height L of the coil H3 is 0.21 m, and the inner width L of the coil m3 is 0.08 m, and the inner height L of the coil Hm3 is 0.13 m. The thickness of the plate and the coil d is 2 mm. The coil and the plate are placed coplanarly, and the diagonal of the coil is collinear with the diagonal of the plate. The transmission distance H of the coupling mechanism t is 0.05 m.

[0078] Taking the circuit diagram of a two-load hybrid wireless power transfer system with power decoupling shown Figure 1 as an example, a circuit model is built using circuit simulation software. Among them, the output fundamental wave amplitudes U1 and U2 of the two high-frequency full-bridge inverters are both 100 V, and the operating angular frequency, i.e., the system resonance angular frequency ω, is 1 MHz. The parameters of the equivalent excitation voltage source circuit of the electric field coupling mechanism are: the self-capacitance C of the input port 1 11 is 149.79 pF, the mutual capacitance C between the input port 1 and the input port 2 12 is 20.15 nF, the mutual capacitance C between the input port 1 and the input port 3 13 is 5.83 nF, the mutual capacitance C between the input port 1 and the input port 414 is 55.32 nF, the self-capacitance C of input port 2 22 is 149.86 pF, the mutual capacitance C between input port 2 and input port 3 23 is 74.97 nF, the mutual capacitance C between input port 2 and input port 4 24 is 5.50 nF, the self-capacitance C of input port 3 33 is 149.18 pF, the mutual capacitance C between input port 3 and input port 4 34 is 26.87 nF, the self-capacitance C of input port 4 44 is 149.72 pF. The parameters of each item of the equivalent excitation voltage source circuit of the magnetic field coupling mechanism are: the self-inductance L1 of input port 1 is 27.20 μH, and the mutual inductance M between input port 1 and input port 2 12 is 0.28 μH, the mutual inductance M between input port 1 and input port 3 13 is 7.90 μH, the mutual inductance M between input port 1 and input port 4 14 is 0.26 μH, the self-inductance L2 of input port 2 is 27.10 μH, and the mutual inductance M between input port 2 and input port 3 23 is 0.19 μH, the mutual inductance M between input port 2 and input port 4 24 is 9.42 μH, the self-inductance L3 of input port 3 is 23.20 μH, and the mutual inductance M between input port 3 and input port 4 34 is 0.20 μH, the self-inductance L4 of input port 4 is 27.10 μH. The inductance L of the same-side decoupling compensation network p is 1.54 μH, L s is 1.14 μH, the S-S compensation inductance L e1 、L e2 、L e4 are all 140.37 μH, L e3 is 145.45 μH.

[0079] As Figure 7 shown, the values of the load R L3 and the load R L4 are changed from 0.1 Ω to 100 Ω. It can be seen that as the load changes, the output currents of output side 3 and output side 4 both remain unchanged. Therefore, the system can achieve constant current output.

[0080] As Figure 8 、 Figure 9 shown, the value of the fixed load R L3 is 10 Ω, the load R L4The value is 50Ω. After disconnecting the DC input voltage of input side 1 or input side 2, the output current on the corresponding output side approaches 0, while the output current on the other output side remains basically unchanged. Therefore, the system basically realizes the independent operation of each transmission channel.

[0081] As can be seen from the above embodiments, by adopting a power decoupled two-load hybrid wireless power transmission system proposed by the present invention, its output current does not change with the change of the load resistance, can maintain the constancy of the output current, the output side of the circuit is only affected by its corresponding input side, and is less affected by other input sides, and basically realizes the independent operation of each transmission channel.

[0082] The above embodiments are only exemplary embodiments of the present invention and are not used to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements within the essence and protection scope of the present invention, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the present invention.

Claims

1. A power decoupled dual-load hybrid wireless power transmission system, characterized in that: include: 2 high-frequency full-bridge inverters, coupling mechanism with opposite-side decoupling conditions, 4 independent external capacitors C ex1 , C ex2 , C ex3 , C ex4 , same-side decoupling compensation circuit, SS compensation circuit, 2 full-bridge rectifiers, 2 load resistors R L1 , R L2 ; The input DC voltages of the two inverters are U dc1 and U dc2 , the working angular frequency is ω, and the output fundamental voltages are U1 and U2 respectively.

2. A power decoupled dual-load hybrid wireless power transmission system according to claim 1, characterized in that: The coupling mechanism with the opposite-side decoupling condition is composed of an electric field coupling part and a magnetic coupling part, wherein the electric field coupling part includes two groups of mutually symmetrical horizontal quadrupole plates, and the magnetic coupling part includes two groups of square transmitting and receiving coils embedded in the plates. The transmitting plates are coplanar quadrupole plates, including a first pair of transmitting plates P1, P2 and a second pair of transmitting plates P3, P4; the receiving plates are coplanar quadrupole plates, including a first pair of receiving plates P5, P6 and a second pair of receiving plates P7, P8. The transmitting coils are two coplanar coils, namely, the transmitting coil L1 and the transmitting coil L2; the receiving coils are two coplanar coils, namely, the receiving coil L3 and the receiving coil L4; any two plates P i , P j The mutual capacitance between m,n Indicates, where m, n = 1, 2, 3, 4, 5, 6, 7, 8, and the coil self-inductance is L a It means that any two coils L a , L b The mutual inductance between ab Indicates that a, b = 1, 2, 3, 4, a ≠ b.

3. The power decoupled dual-load hybrid wireless power transmission system according to claim 1, characterized in that: 4 independent external capacitors C ex1 , C ex2 , C ex3 , C ex4 , where the capacitor C ex1 Connected in parallel on both sides of the plates P1 and P2, capacitor C ex2 Connected in parallel on both sides of the plates P3 and P4, capacitor C ex3 Connected in parallel on both sides of the plates P5 and P6, capacitor C ex4 Connected in parallel on both sides of the plates P7 and P8; the plates P1 and P2 of the electric field part of the coupling mechanism and the independent external capacitor C connected in parallel on both sides of the plates ex1 Forming input port 1, plate P3 and plate P4 and independent external capacitor C connected in parallel on both sides of the plate ex2 Forming input port 2, plates P5 and P6 and independent external capacitors C connected in parallel on both sides of the plates ex3 Forming output port 3, plates P7 and P8 and independent external capacitors C connected in parallel on both sides of the plates ex4 Output port 4 is formed.

4. The power decoupled dual-load hybrid wireless power transmission system according to claim 1, characterized in that: The Π-type equivalent circuit of the electric field coupling mechanism of the power decoupled dual-load hybrid wireless power transmission system, wherein C in1 is the self capacitance of input port 1, C in2 is the self capacitance of input port 2, C out3 is the self capacitance of output port 3, C out4 is the self capacitance of output port 4, C m,p1p2p5p6 is the main coupling equivalent mutual capacitance between input port 1 and output port 3, C m,p3p4p7p8 is the main coupling mutual capacitance between input port 2 and output port 4, C m,p1p2p3p4 is the mutual capacitance of the same side coupling between input port 1 and input port 2, C m,p5p6p7p8 is the mutual capacitance of the same side coupling between output port 3 and output port 4, C m,p1p2p7p8 is the mutual capacitance of the opposite sides of input port 1 and output port 4, C m,p3p4p5p6 is the opposite-side coupling mutual capacitance between input port 2 and output port 3, where U c1 , U c2 , U c3 , U c4 are the voltages at both ends of the four ports, the port equivalent mutual capacitance C of input port 1, input port 2, output port 3, and output port 4 respectively. m,1,1 , C m,2,1 , C m,1,2 , C m,2,2 Respectively expressed as: The admittance matrix Y of the π-type equivalent circuit of the electric field coupling mechanism c for: Impedance matrix Z of electric field coupling mechanism c It can be expressed as: According to the two-port network characteristics of the electric field coupling mechanism, it can be transformed into an equivalent excitation voltage source model, and the impedance matrix Z c The element in the i-th row and j-th column is defined as 1 / jωC ij , the impedance matrix can be expressed as: The magnetic field coupling mechanism of the power decoupled dual-load hybrid wireless power transmission system, the two ends of the coil L1 form an input port 1, the two ends of L2 form an input port 2, the two ends of L3 form an output port 3, and the two ends of L4 form an output port 4. According to the two-port network characteristics of the coupling mechanism, the impedance matrix Z of its equivalent excitation voltage source model i It can be expressed as: The magnetic field energy transmission channel and the electric field energy transmission channel of the power decoupled dual-load hybrid wireless power transmission system are in series relationship, so the equivalent excitation voltage source model of the hybrid coupling mechanism of the system is the equivalent excitation voltage source model of the magnetic field coupling mechanism and the equivalent excitation voltage source model of the electric field coupling mechanism in series. Therefore, without considering the conditions satisfied by each component of the compensation network, the overall loop current matrix of the system can be obtained: Among them, U1 is the AC output voltage of the high-frequency full-bridge inverter on the system input side 1, U2 is the AC output voltage of the high-frequency full-bridge inverter on the system input side 2, I1 is the AC output current of the high-frequency full-bridge inverter on the system input side 1, I2 is the AC output current of the high-frequency full-bridge inverter on the system input side 2, I3 is the AC output current before rectification on the system output side 3, I4 is the AC output current before rectification on the system output side 4, jX ii =jωL i +1 / jωC ii ;jX ij = ±jωM ij +1 / jωC ij ,i≠j, where jX ij If it is a sub-diagonal element, take +. When jX ij For other elements, take -.

5. The power decoupled dual-load hybrid wireless power transmission system according to claim 1, characterized in that: By adjusting the parameters of the pole plate and coil, the impedances on the opposite sides of the coupling mechanism are offset, that is:

6. The power decoupled dual-load hybrid wireless power transmission system according to claim 1, characterized in that: The same-side decoupling compensation circuit is composed of two independent impedance elements X p and X s , where X p One end is connected to the same potential end of the emitter plates P2 and P3, and the other end is connected to the negative potential end of the inverter output voltage U1 and U2; X s One end is connected to the same potential end of the receiving plates P6 and P7, and the other end is connected to the negative potential end of the output voltage U3 and U4 before rectification; the independent impedance element X p and X s The selection must be made based on the equivalent model of the hybrid coupling mechanism. If the hybrid coupling mechanism is capacitive, the equivalent model of the hybrid coupling mechanism is an electric field coupling model. The same-side decoupling compensation circuit is composed of two independent inductors L p , L s If the hybrid coupling mechanism is inductive, the equivalent model of the hybrid coupling mechanism is a magnetic field coupling model, and the same-side decoupling compensation circuit is two independent capacitors C p , C s ; Among them, the same-side decoupling compensation impedance element X p and X s The following conditions must be met:

7. The power decoupled dual-load hybrid wireless power transmission system according to claim 1, characterized in that: The SS compensation circuit consists of four independent impedance elements X e1 , X e2 , X e3 , X e4 , where X e1 One end is connected to the end of the coil L1 close to the input voltage, and the other end is connected to the positive potential end of the inverter output voltage U1; X e2 One end is connected to the end of coil L2 close to the input voltage, and the other end is connected to the positive potential end of the inverter output voltage U2; X e3 One end is connected to the end of the coil L3 close to the input voltage, and the other end is connected to the positive potential end of the output voltage U3 before rectification; X e4 One end is connected to the end of the coil L4 close to the input voltage, and the other end is connected to the positive potential end of the output voltage U4 before rectification. e1 , X e2 , X e3 , X e4 The selection must be made based on the equivalent model of the hybrid coupling mechanism. If the hybrid coupling mechanism is capacitive, the equivalent model of the hybrid coupling mechanism is an electric field coupling model. The SS compensation circuit is composed of four independent inductors L e1 , L e2 , L e3 , L e4 If the hybrid coupling mechanism is inductive, the equivalent model of the hybrid coupling mechanism is a magnetic field coupling model, and the same-side decoupling compensation circuit is composed of four independent capacitors C e1 , C e2 , C e3 , C e4 ; Among them, the SS compensation impedance component parameter X e1 , X e2 , X e3 , X e4 The following conditions are met respectively:

8. The power decoupled dual-load hybrid wireless power transmission system according to claim 1, characterized in that: The transfer matrix is: From formula (10), the output currents I3 and I4 of the system are: Through the above parameters and structural design, the output current of the circuit is constant and does not change with the change of load, and the circuit output is only related to the power main coupling impedance corresponding to each transmission channel and will not be affected by other input sides or output sides; it can be extended to applications containing multiple loads, and when a load does not need power supply, it will not affect the output of other loads.

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