A wireless charging system with zero-phase-angle constant-current constant-voltage output characteristics and a parameter design method

Abstract

This invention proposes a wireless charging system and parameter design method with zero-phase-angle constant current and constant voltage output characteristics. The wireless charging system specifically includes a DC voltage source U. DC Inverter bridge, primary-side compensation network, transmitting coil L p2 Receiver coil L' s1 Secondary-side compensation network, rectifier bridge, and load resistor R; the DC voltage source U DC The inverter bridge is connected to the primary-side compensation network and the transmitting coil L. p2 Connected, the transmitting coil L p2 With receiving coil L' s1 Mutual inductance, the receiving coil L' s1 The system is connected to a secondary compensation network and a rectifier bridge, with the rectifier bridge connected to the load resistor R. This invention achieves constant current / constant voltage operating mode switching only through two fixed operating frequencies under varying coupling coefficients, with both operating modes satisfying zero phase angle. Furthermore, the compensation topology suppresses higher harmonics in the rectifier unit, making the system's output current and voltage values ​​more stable.

Description

Technical Field

[0001] This invention relates to the field of wireless charging technology, specifically to a wireless charging system and parameter design method with zero-phase-angle constant current and constant voltage output characteristics. Background Technology

[0002] Most electrical devices currently use lithium or lead-acid batteries for power. Charging these loads requires a constant current followed by a constant voltage charging mode, and the charging voltage or current cannot fluctuate significantly with changes in the load. There are currently three methods for achieving constant current / constant voltage output in wireless power transfer systems: Method 1: Achieving constant current / constant voltage output by adjusting the system's operating frequency; Method 2: Achieving constant current / constant voltage output by switching the topology; Method 3: Achieving constant current / constant voltage output by adding an external control circuit.

[0003] However, the three existing methods for achieving constant current / constant voltage output in wireless power transfer research have certain drawbacks. Method 1: The current method of changing the operating frequency of the wireless charging system can only achieve constant current / constant voltage output and satisfy zero phase angle under a fixed coupling coefficient. When the coupling coefficient changes, the system only exhibits constant current output characteristics, or only constant voltage output characteristics, or even neither, posing difficulties in practical applications. Method 2: Switching the topology through a switch increases system complexity. The introduction of a switch introduces losses, which is detrimental to improving system efficiency. Furthermore, in high-power wireless power supply systems, losses can lead to significant temperature rise in devices, introducing heat dissipation problems. Method 3: The introduction of a control circuit also increases system complexity, introduces losses, and suffers from excessive temperature rise in high-power applications. In addition, Method 3 places higher demands on the control circuit. For the same topology, when the excitation frequency remains constant, the wireless power supply system itself only has constant current or constant voltage output characteristics, and only has zero phase angle in one output state. When the system needs to operate in both constant current and constant voltage output states, one of the output modes is entirely achieved by the control circuit. When the coupling coefficient or load variation range is large, the adjustable range of the control circuit needs to be wider, and situations may even occur that exceed the adjustable range of the control circuit. Therefore, there is an urgent need for a wireless charging topology and parameter design method with zero phase angle constant current / constant voltage output characteristics, so that the system can achieve constant current / constant voltage working mode switching only through two fixed frequency switching under varying coupling coefficients, and both working modes satisfy zero phase angle. Summary of the Invention

[0004] To address the issue of switching between constant current and constant voltage charging processes for loads such as lithium batteries and lead-acid batteries in wireless power transmission systems, this invention proposes a wireless charging system and parameter design method with zero-phase-angle constant current and constant voltage output characteristics. This system achieves constant current / constant voltage mode switching only through two fixed operating frequencies under varying coupling coefficients, with both operating modes satisfying zero phase angle.

[0005] This invention is achieved through the following scheme:

[0006] A secondary circuit for a wireless charging system with zero-phase-angle constant current and constant voltage output characteristics:

[0007] The secondary circuit includes a receiving coil L s1 The first compensation network Z s1 Secondary side compensation inductor L s2 Secondary side compensation capacitor C s1 C s2 and C s3 The second compensation network Z D0 rectifier unit and load resistor R;

[0008] The receiving coil L s1 One end is connected to the secondary compensation capacitor C s1 One end is connected to the secondary compensation capacitor C. s1 The other end is connected to the first compensation network Z s1 One end is connected, the first compensation network Z s1 The other end is connected to the secondary compensation capacitor C. s2 One end and secondary compensation inductor L s2 One end is connected;

[0009] Secondary compensation inductor L s2 The other end is connected to the secondary compensation capacitor C. s3 One end is connected to the rectifier unit, and the receiving coil L s1 The other end is connected to the secondary compensation capacitor C. s2 The other end and the secondary compensation capacitor C s3 The other end is connected; the rectifier unit is connected to the load resistor R.

[0010] Furthermore,

[0011] The first compensation network Z s1 Including secondary compensation inductor L s0 and secondary side compensation capacitor C s0 The secondary-side compensating inductor L s0 and secondary side compensation capacitor C s0 Series connection;

[0012] The second compensation network ZD0 Including secondary compensation inductor L D0 and the secondary adjustable capacitor C D0_X The secondary-side compensating inductor L D0 and the secondary adjustable capacitor C D0_X Series connection.

[0013] Furthermore,

[0014] The secondary compensation inductor L s2 Contains n compensator inductors L s2_n .

[0015] A wireless charging system with zero-phase-angle constant current and constant voltage output characteristics:

[0016] The wireless charging system includes a primary-side circuit and a secondary-side circuit.

[0017] The primary circuit includes a DC voltage source U. DC Inverter unit, primary-side compensation network and transmitting coil L p2 ;

[0018] The secondary circuit is the secondary circuit described above;

[0019] The DC voltage source U DC The inverter unit is connected to the primary-side compensation network and the transmitting coil L. p2 Connected, the transmitting coil L p2 With receiving coil L s1 Mutual intuition.

[0020] Furthermore,

[0021] The primary edge compensation network is a PS compensation structure;

[0022] The PS compensation structure includes a primary-side compensation inductance of L. p1 Primary-side compensation capacitor C p1 and C p2 ;

[0023] In the primary-side compensation network, the primary-side compensation inductance L p1 and primary-side compensation capacitor C p1 Forming a parallel branch, the primary-side compensation capacitor C p2 and transmitting coil L p2 The parallel branches and the series branches are connected in series.

[0024] Furthermore,

[0025] The inverter unit includes four switching transistors Q1, Q2, Q3 and Q4;

[0026] The DC voltage source UDC The positive terminals are connected to one end of the switching transistors Q1 and Q2, respectively;

[0027] The other end of switch Q1 is connected to one end of switch Q3 and the primary-side transmitting coil L, respectively. p2 One end is connected;

[0028] The other end of switching transistor Q2 is connected to one end of switching transistor Q4, and the primary-side compensating inductor L p1 One end and the primary-side compensation capacitor C p1 One end is connected;

[0029] DC voltage source U DC The negative terminals are connected to the other ends of switching transistors Q3 and Q4, respectively;

[0030] Primary-side compensation capacitor C p2 One end is connected to the primary compensation inductor L p1 The other end and the primary-side compensation capacitor C p1 The other end is connected;

[0031] Primary-side compensation capacitor C p2 The other end is connected to the transmitting coil L p2 The other end is connected.

[0032] Furthermore,

[0033] The rectifier unit includes four diodes D1, D2, D3, and D4, and a capacitor C0;

[0034] One end of the load resistor R is connected to one end of the capacitor C0, the negative terminal of diode D1, and the negative terminal of diode D2, respectively.

[0035] The anode of diode D1 is connected to the cathode of diode D3 and the secondary adjustable capacitor C. D0_X ;

[0036] The other end of the load resistor R is connected to the other end of the capacitor C0, the positive terminal of diode D3, and the positive terminal of diode D4, respectively.

[0037] The anode of diode D2 is connected to the cathode of diode D4 and the secondary-side compensation capacitor C. s3 Secondary side compensation capacitor C s2 and receiving coil L s1 .

[0038] A parameter design method for a wireless charging system with zero-phase-angle constant current and constant voltage output characteristics:

[0039] The parameter design method specifically includes the following steps:

[0040] Step 1: Construct a topology that simultaneously exhibits constant current and constant voltage output characteristics under varying coupling coefficients;

[0041] Step 2: When the topology has constant current output characteristics, the transmitting coil L p2 Primary-side compensating inductor L p1 Primary-side compensation capacitor C p1 and C p2 Secondary compensation inductor L s2_1 and L s2_2 Secondary side compensation capacitor C s2 and C s3 The relationship that satisfies this is:

[0042]

[0043] Where, ω CC ω is the angular frequency corresponding to the constant current mode; j is the imaginary number.

[0044] Step 3: When the topology has constant voltage output characteristics, the transmitting coil L p2 Primary-side compensating inductor L p1 Primary-side compensation capacitor C p1 and C p2 Secondary compensation inductor L s2_1 and L s2_2 Secondary side compensation capacitor C s2 The relationship that satisfies this is:

[0045]

[0046] Where, ω CV This is the angular frequency corresponding to the constant voltage mode;

[0047] Step 4: Based on the solutions from Step 2 and Step 3, obtain the operating angular frequency ω of the system when it operates in constant current and constant voltage modes, respectively. CV and ω CC :

[0048]

[0049] Where: λ p This is the ratio of the primary-side capacitance. L p2 =(1+λ) p )L p1 ;

[0050] Step 5: When the system operates in constant voltage mode and has zero phase angle output characteristics, the receiving coil L... s1 Secondary compensation inductor L s2_1 and L s2_2 and secondary side compensation capacitor C s1 and Cs3 The required relation is:

[0051]

[0052]

[0053] Step 6: Add compensation capacitor C on the secondary side s1 C s2 Add a series compensation inductor L between s0 and compensation capacitor C s0 Compensation is applied to the secondary circuit, specifically the compensation inductor L. s0 and compensation capacitor C s0 Secondary input impedance Z s1 The relations are as follows:

[0054]

[0055]

[0056] Step 7: Let Z in step 6 s1 =0, thus obtaining the compensation inductance L s0 Compensation capacitor C s0 Relationship:

[0057]

[0058]

[0059] Step 8: The rectifier unit introduces higher harmonics into the system. A series compensation inductor L is added before the rectifier unit. D0 and adjustable capacitor C D0_X The adjustable capacitor C of the system operates in constant current and constant voltage modes. D0_X The relationships are as follows:

[0060]

[0061] Where C D0_CC The adjustable capacitor C for the system in constant current operating mode D0_X Relationship, C D0_CV The adjustable capacitor C for the system in constant voltage operating mode D0_X Relationship;

[0062] Step 9: Merge identical devices in the same branch, i.e., L s0 and L s1 Merge into L' s1 C s0 and C s1 Merge into C' s1 L s2_1 and L s2_2Merge into L s2 :

[0063] L′ s1 =L s1 +L s0_1

[0064]

[0065] L s2 =L s2_1 +L s2_2 ;

[0066] Step 10: To ensure that the input voltage values ​​are the same in the constant current and constant voltage stages at the same coupling coefficient, the following relationship must be satisfied:

[0067]

[0068] Among them: I CC and U CV These are the constant current charging current and constant voltage charging voltage of the load, respectively.

[0069] An electronic device includes a memory and a processor, the memory storing a computer program, the processor executing the computer program to implement the steps of the above method.

[0070] A computer-readable storage medium for storing computer instructions that, when executed by a processor, implement the steps of the above-described method.

[0071] Beneficial effects of the invention

[0072] (1) By constructing the topology and setting the parameter relationship, this invention achieves the switching between constant current and constant voltage working modes by switching between two fixed working frequencies under the condition of variable coupling coefficient, and both working modes satisfy zero phase angle;

[0073] (2) In order to suppress the influence of high-order harmonics caused by the rectifier unit on the wireless power system, the present invention also suppresses high-order harmonics through topology compensation, thereby improving the stability of the system's constant current and constant voltage output values.

[0074] (3) Compared with existing methods for switching between constant current and constant voltage modes, this invention does not require the introduction of a switch for topology switching, nor does it require the introduction of complex control circuits. It eliminates the power loss and heat dissipation problems of switching switches, control circuits, etc. It can achieve the switching between constant current and constant voltage modes by switching between two fixed operating frequencies, and the transmission efficiency of the system is improved by optimizing the parameters. Attached Figure Description

[0075] Figure 1This is a schematic diagram of a wireless charging topology circuit with zero-phase-angle constant current / constant voltage output characteristics according to the present invention.

[0076] Figure 2 This is a circuit schematic diagram of a certain embodiment of the present invention, which has constant current / constant voltage output characteristics.

[0077] Figure 3 A circuit schematic diagram of a compensation topology added to the secondary side in one embodiment of the present invention;

[0078] Figure 4 This invention provides a topology compensation method for suppressing higher harmonics in a rectifier unit, as described in one embodiment.

[0079] Figure 5 The transconductance gain and voltage gain vary with load and coupling coefficient in one embodiment of the present invention, wherein (a) transconductance gain; (b) voltage gain;

[0080] Figure 6 The input impedance angle varies with load and coupling coefficient in one embodiment of the present invention, wherein (a) constant current mode; (b) constant voltage mode;

[0081] Figure 7 In one embodiment of the present invention, under the condition of variable coupling coefficient, the system transmission efficiency varies with the load, wherein (a) constant current mode; (b) constant voltage mode. Detailed Implementation

[0082] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0083] Combination Figures 1 to 7 ,

[0084] like Figure 1 A secondary circuit for a wireless charging system with zero-phase-angle constant current and constant voltage output characteristics:

[0085] The secondary circuit includes a receiving coil L s1 The first compensation network Z s1 Secondary side compensation inductor L s2 Secondary side compensation capacitor C s1 C s2 and C s3 The second compensation network Z D0 rectifier unit and load resistor R;

[0086] The receiving coil L s1One end is connected to the secondary compensation capacitor C s1 One end is connected to the secondary compensation capacitor C. s1 The other end is connected to the first compensation network Z s1 One end is connected, the first compensation network Z s1 The other end is connected to the secondary compensation capacitor C. s2 One end and secondary compensation inductor L s2 One end is connected;

[0087] Secondary compensation inductor L s2 The other end is connected to the secondary compensation capacitor C. s3 One end is connected to the rectifier unit, and the receiving coil L s1 The other end is connected to the secondary compensation capacitor C. s2 The other end and the secondary compensation capacitor C s3 The other end is connected; the rectifier unit is connected to the load resistor R.

[0088] The first compensation network Z s1 Including secondary compensation inductor L s0 and secondary side compensation capacitor C s0 The secondary-side compensating inductor L s0 and secondary side compensation capacitor C s0 Series connection;

[0089] The second compensation network Z D0 Including secondary compensation inductor L D0 and the secondary adjustable capacitor C D0_X The secondary-side compensating inductor L D0 and the secondary adjustable capacitor C D0_X Series connection.

[0090] The secondary compensation inductor L s2 Contains n compensator inductors L s2_n .

[0091] A wireless charging system with zero-phase-angle constant current and constant voltage output characteristics:

[0092] The wireless charging system includes a primary-side circuit and a secondary-side circuit.

[0093] The primary circuit includes a DC voltage source U. DC Inverter unit, primary-side compensation network and transmitting coil L p2 ;

[0094] The secondary circuit is the secondary circuit described above;

[0095] The DC voltage source U DC The inverter unit is connected to the primary-side compensation network and the transmitting coil L. p2Connected, the transmitting coil L p2 With receiving coil L s1 Mutual intuition.

[0096] The primary edge compensation network is a PS compensation structure;

[0097] The PS compensation structure includes a primary-side compensation inductance of L. p1 Primary-side compensation capacitor C p1 and C p2 ;

[0098] In the primary-side compensation network, the primary-side compensation inductance L p1 and primary-side compensation capacitor C p1 Forming a parallel branch, the primary-side compensation capacitor C p2 and transmitting coil L p2 The parallel branches and the series branches are connected in series.

[0099] The inverter unit includes four switching transistors Q1, Q2, Q3 and Q4;

[0100] The DC voltage source U DC The positive terminals are connected to one end of the switching transistors Q1 and Q2, respectively;

[0101] The other end of switch Q1 is connected to one end of switch Q3 and the primary-side transmitting coil L, respectively. p2 One end is connected;

[0102] The other end of switching transistor Q2 is connected to one end of switching transistor Q4, and the primary-side compensating inductor L p1 One end and the primary-side compensation capacitor C p1 One end is connected;

[0103] DC voltage source U DC The negative terminals are connected to the other ends of switching transistors Q3 and Q4, respectively;

[0104] Primary-side compensation capacitor C p2 One end is connected to the primary compensation inductor L p1 The other end and the primary-side compensation capacitor C p1 The other end is connected;

[0105] Primary-side compensation capacitor C p2 The other end is connected to the transmitting coil L p2 The other end is connected.

[0106] The rectifier unit includes four diodes D1, D2, D3, and D4, and a capacitor C0;

[0107] One end of the load resistor R is connected to one end of the capacitor C0, the negative terminal of diode D1, and the negative terminal of diode D2, respectively.

[0108] The anode of diode D1 is connected to the cathode of diode D3 and the secondary adjustable capacitor C. D0_X ;

[0109] The other end of the load resistor R is connected to the other end of the capacitor C0, the positive terminal of diode D3, and the positive terminal of diode D4, respectively.

[0110] The anode of diode D2 is connected to the cathode of diode D4 and the secondary-side compensation capacitor C. s3 Secondary side compensation capacitor C s2 and receiving coil L s1 .

[0111] A parameter design method for a wireless charging system with zero-phase-angle constant current and constant voltage output characteristics:

[0112] The parameter design method specifically includes the following steps:

[0113] Step 1: As Figure 2 As shown, a topology structure with constant current and constant voltage output characteristics is constructed under variable coupling coefficient conditions.

[0114] Step 2: When the topology has constant current output characteristics, the transmitting coil L p2 Primary-side compensating inductor L p1 Primary-side compensation capacitor C p1 and C p2 Secondary compensation inductor L s2_1 and L s2_2 Secondary side compensation capacitor C s2 and C s3 The relationship that satisfies this is:

[0115]

[0116] Where, ω CC ω is the angular frequency corresponding to the constant current mode; j is the imaginary number.

[0117] Step 3: When the topology has constant voltage output characteristics, the transmitting coil L p2 Primary-side compensating inductor L p1 Primary-side compensation capacitor C p1 and C p2 Secondary compensation inductor L s2_1 and L s2_2 Secondary side compensation capacitor C s2 The relationship that satisfies this is:

[0118]

[0119] Where, ω CVThis is the angular frequency corresponding to the constant voltage mode;

[0120] Step 4: Based on the solutions from Step 2 and Step 3, obtain the operating angular frequency ω of the system when it operates in constant current and constant voltage modes, respectively. CV and ω CC :

[0121]

[0122] Where: λ p This is the ratio of the primary-side capacitance. L p2 =(1+λ) p )L p1 ;

[0123] By setting the system parameter relationships in steps 2-4, the constructed topology has constant current / constant voltage output characteristics under varying coupling coefficients, but the system does not have zero phase angle output characteristics in either of the two operating modes.

[0124] Step 5: When the system operates in constant voltage mode and has zero phase angle output characteristics, the receiving coil L... s1 Secondary compensation inductor L s2_1 and L s2_2 and secondary side compensation capacitor C s1 and C s3 The required relation is:

[0125]

[0126]

[0127] Step 6: As Figure 3 As shown, without disrupting the zero-phase-angle output characteristics of the system in constant current, constant voltage, and constant voltage modes, the secondary-side compensation capacitor C... s1 C s2 Add a series compensation inductor L between s0 and compensation capacitor C s0 The secondary circuit is compensated to achieve zero-phase output in constant current mode, thereby compensating for the inductor L. s0 and compensation capacitor C s0 Secondary input impedance Z s1 The relations are as follows:

[0128]

[0129]

[0130] Step 7: Let Z in step 6 s1 =0, thus obtaining the compensation inductance L s0 Compensation capacitor Cs0 Relationship:

[0131]

[0132]

[0133] Step 8: Adding a rectifier unit to the system will introduce certain higher harmonics. To suppress the impact of higher harmonics on the system output characteristics, higher harmonics are introduced, such as... Figure 4 As shown, a series compensation inductor L is added before the rectifier unit. D0 and adjustable capacitor C D0_X The adjustable capacitor C of the system operates in constant current and constant voltage modes. D0_X The relationships are as follows:

[0134]

[0135] Where C D0_CC The adjustable capacitor C for the system in constant current operating mode D0_X Relationship, C D0_CV The adjustable capacitor C for the system in constant voltage operating mode D0_X Relationship;

[0136] Step 9: Merge identical devices in the same branch, i.e., L s0 and L s1 Merge into L' s1 C s0 and C s1 Merge into C' s1 L s2_1 and L s2_2 Merge into L s2 :

[0137] L′ s1 =L s1 +L s0_1

[0138]

[0139] L s2 =L s2_1 +L s2_2 ;

[0140] Step 10: The constant current output value and constant voltage output value of the system change with the coupling coefficient in a consistent manner. To ensure that the input voltage values ​​corresponding to the constant current and constant voltage stages are the same at the same coupling coefficient, the following relationship must be satisfied:

[0141]

[0142] Among them: I CC and U CVThese are the constant current charging current and constant voltage charging voltage of the load, respectively.

[0143] An electronic device includes a memory and a processor, the memory storing a computer program, the processor executing the computer program to implement the steps of the above method.

[0144] A computer-readable storage medium for storing computer instructions that, when executed by a processor, implement the steps of the above-described method.

[0145] This invention achieves constant current / constant voltage operating mode switching by only two fixed operating frequencies under varying coupling coefficients, with both operating modes satisfying zero phase angle. Furthermore, by compensating for the suppression of higher harmonics in the rectifier unit through topology compensation, the system's output current and voltage values ​​are made more stable.

[0146] The parameters of the topology, determined using the parameter design method described above, are shown in Table 1. Among them, the constant current output current is 6A, the constant voltage output voltage is 144V, and the transmission power is 864W.

[0147]

[0148] Table 1 Topology parameters

[0149] The transconductance gain and voltage gain of the wireless power transfer system vary with the coupling coefficient and load, respectively, as follows: Figure 5 As shown.

[0150] according to Figure 5 (a) It can be seen that the transconductance gain of the system decreases as the coupling coefficient increases. When the coupling coefficient of the system is fixed and the load changes, the transconductance gain of the system remains constant. Therefore, it can be seen that the system has constant current output characteristics.

[0151] according to Figure 5 (b) It can be seen that the voltage gain of the system increases as the coupling coefficient decreases. When the coupling coefficient remains unchanged and the load changes, the voltage gain of the system remains constant. Therefore, it can be seen that the system has constant voltage output characteristics.

[0152] The input impedance angle of the system varies with load and coupling coefficient in both operating modes as follows: Figure 6 As shown, the system input impedance angle is not equal to 0° due to the influence of the device's internal resistance.

[0153] according to Figure 6 (a) It can be seen that when the load value is smaller and the coupling coefficient is larger, the input impedance angle of the system corresponding to constant current mode is larger. However, under constant current mode, the absolute value of the maximum input impedance angle does not exceed 0.266°.

[0154] When the system operates in constant voltage output mode, the input impedance angle increases as the coupling coefficient decreases, but the absolute value of the input impedance angle does not exceed 3.0°.

[0155] In a wireless power transfer system with varying coupling coefficients, the transmission efficiency of the two operating modes varies with the load as follows: Figure 7 As shown.

[0156] according to Figure 7 (a) It can be seen that when the system is working in constant current mode, the transmission efficiency of the system increases with the increase of the coupling coefficient, and conversely, decreases with the increase of the load value. In constant current mode, the transmission efficiency of the system is higher than 93.7%.

[0157] according to Figure 7 (b) It can be seen that in constant voltage mode, the transmission efficiency increases with the increase of load and coupling coefficient, and the overall efficiency is higher than 93.7%.

[0158] The foregoing has provided a detailed description of the wireless charging system and parameter design method with zero-phase-angle constant current and constant voltage output characteristics proposed in this invention. The principles and implementation methods of this invention have been explained. The above description of the embodiments is only for the purpose of helping to understand the method and core ideas of this invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this invention. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A secondary circuit of a wireless charging system with zero-phase-angle constant current and constant voltage output characteristics, characterized in that: The secondary circuit includes a receiving coil. L s1 The first compensation network Z s1 Secondary side compensation inductor L s2 Secondary side compensation capacitor C s1 , C s2 and C s3 The second compensation network Z D0 rectifier unit and load resistor R ; The receiving coil L s1 One end and the secondary compensation capacitor C s1 One end is connected to the secondary compensation capacitor. C s1 The other end is connected to the first compensation network Z s1 One end is connected, the first compensation network Z s1 The other end is connected to the secondary compensation capacitor. C s2 One end and secondary compensation inductor L s2 One end is connected; Secondary compensation inductor L s2 The other end is connected to the secondary compensation capacitor. C s3 One end is connected to the rectifier unit, and the receiving coil L s1 The other end is connected to the secondary compensation capacitor. C s2 The other end and the secondary compensation capacitor C s3 The other end is connected; the rectifier unit is connected to the load resistor. R .

2. The secondary-side circuit according to claim 1, characterized in that: The first compensation network Z s1 Including secondary side compensation inductor L s0 and secondary side compensation capacitor C s0 The secondary-side compensating inductor L s0 and secondary side compensation capacitor C s0 Series connection; The second compensation network Z D0 Including secondary side compensation inductor L D0 and secondary adjustable capacitor C D0_X The secondary-side compensating inductor L D0 and secondary adjustable capacitor C D0_X Series connection.

3. The secondary-side circuit according to claim 1, characterized in that: The secondary compensation inductor L s2 Contains n compensator inductors L s2_n .

4. A wireless charging system with zero-phase-angle constant current and constant voltage output characteristics, characterized in that: The wireless charging system includes a primary-side circuit and a secondary-side circuit. The primary circuit includes a DC voltage source. U DC Inverter unit, primary-side compensation network and transmitting coil L p2 ; The secondary circuit is the secondary circuit as described in any one of claims 1-3; The DC voltage source U DC The inverter unit is connected to the primary-side compensation network and the transmitting coil. L p2 Connected, the transmitting coil L p2 With receiving coil L s1 Mutual intuition.

5. The wireless charging system according to claim 4, characterized in that: The primary edge compensation network is a PS compensation structure; The PS compensation structure includes a primary-side compensation inductor of... L p1 Primary-side compensation capacitor C p1 and C p2 ; In the primary-side compensation network, the primary-side compensation inductor L p1 and primary-side compensation capacitor C p1 Forming a parallel branch, the primary-side compensation capacitor C p2 and transmitting coil L p2 The parallel branches and the series branches are connected in series.

6. The wireless charging system according to claim 4, characterized in that: The inverter unit includes four switching transistors. Q 1. Q 2. Q 3 and Q 4; The DC voltage source U DC The positive terminals are respectively connected to the switching transistor. Q 1 and Q Connect one end of 2; Switching transistor Q The other end of 1 is connected to the switching transistor. Q One end of 3 and the primary-side transmitting coil L p2 One end is connected; Switching transistor Q The other end of 2 is connected to the switching transistor. Q 4, primary-side compensating inductor L p1 one end and the primary-side compensation capacitor C p1 One end is connected; DC voltage source U DC The negative terminals are respectively connected to the switching transistor. Q 3 and Q Connect the other end of 4; Primary-side compensation capacitor C p2 One end is connected to the primary side compensation inductor. L p1 The other end and the primary-side compensation capacitor C p1 The other end is connected; Primary-side compensation capacitor C p2 The other end is connected to the transmitting coil L p2 The other end is connected.

7. The wireless charging system according to claim 4, characterized in that: The rectifier unit includes four diodes. D 1. D 2. D 3. D 4 and capacitors C 0; The load resistor R One end is connected to the capacitor C One end of 0, diode D The negative terminal of 1 and the diode D Connect the negative terminal of 2; diode D The positive terminals of 1 are connected to diodes respectively. D 3. The negative terminal and the adjustable capacitor on the secondary side C D0_X ; The load resistor R The other end is connected to the capacitor. C The other end of 0, diode D 3's positive terminal and diode D 4 is connected to the positive terminal; diode D The positive terminals of 2 are connected to diodes respectively. D 4. Negative and secondary side compensation capacitors C s3 Secondary side compensation capacitor C s2 and receiving coil L s1 .

8. A parameter design method for a wireless charging system with zero-phase-angle constant current and constant voltage output characteristics as described in any one of claims 4 to 7, characterized in that: The parameter design method specifically includes the following steps: Step 1: Construct a topology that simultaneously exhibits constant current and constant voltage output characteristics under varying coupling coefficients; Step 2: When the topology has constant current output characteristics, the transmitting coil L p2 Primary-side compensating inductor L p1 Primary-side compensation capacitor C p1 and C p2 Secondary compensation inductor L s2_1 and L s2_2 Secondary side compensation capacitor C s2 and C s3 The relationship that satisfies this is: in, This is the angular frequency corresponding to the constant current mode; j It is the symbol for imaginary numbers; Step 3: When the topology has constant voltage output characteristics, the transmitting coil... L p2 Primary-side compensating inductor L p1 Primary-side compensation capacitor C p1 and C p2 Secondary compensation inductor L s2_1 and L s2_2 Secondary side compensation capacitor C s2 The relationship that satisfies this is: in, This is the angular frequency corresponding to the constant voltage mode; Step 4: Based on the solutions from Step 2 and Step 3, obtain the operating angular frequencies of the system when it operates in constant current and constant voltage modes, respectively. and : , in: This is the ratio of the primary-side capacitance. , ; Step 5: When the system operates in constant voltage mode and has zero phase angle output characteristics, the receiving coil... L s1 Secondary compensation inductor L s2_1 and L s2_2 and secondary side compensation capacitor C s1 and C s3 The required relation is: ； Step 6: Add compensation capacitor on the secondary side C s1 , C s2 Add a series compensating inductor between L s0 and compensation capacitor C s0 Compensate the secondary circuit to compensate for the inductance. L s0 and compensation capacitor C s0 Secondary input impedance Z s1 The relations are as follows: ， ； Step 7: Let the steps in step 6 be... Z s1 =0, thus obtaining the compensation inductance. L s0 Compensation capacitor C s0 Relationship: ； Step 8: The rectifier unit introduces higher harmonics into the system. A series compensating inductor is added before the rectifier unit. L D0 and adjustable capacitor C D0_X The system has an adjustable capacitor in constant current and constant voltage operating modes. C D0_X The relationships are as follows: , ； in C D0_CC Adjustable capacitor for the system in constant current operating mode C D0_X Relationship, C D0_CV Adjustable capacitor for the system in constant voltage operating mode C D0_X Relationship; Step 9: Merge identical devices in the same branch, i.e. L s0 and L s1 merged into L' s1 , C s0 and C s1 merged into C' s1 , L s2_1 and L s2_2 merged into L s2 : L s2 = L s2_1 + L s2_2 ； Step 10: To ensure that the input voltage values ​​are the same in the constant current and constant voltage stages at the same coupling coefficient, the following relationship must be satisfied: in: I CC and U CV These are the constant current charging current and constant voltage charging voltage of the load, respectively.

9. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method of claim 8.

10. A computer-readable storage medium for storing computer instructions, characterized in that, When the computer instructions are executed by the processor, they implement the steps of the method of claim 8.

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