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Mutual inductance detection method of wireless charging system, control method and corresponding system

A technology of wireless charging and detection method, which is used in the measurement of electricity, current collectors, electric vehicles, etc., can solve the problems of deviation of the calculated mutual inductance from the actual value, affecting system performance, and error of the calculated mutual inductance, etc., to improve performance and stability. , Improve the detection accuracy and eliminate the effect of engineering errors

Active Publication Date: 2021-04-30
ZTEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual engineering applications, there may be engineering errors in loosely coupled transformer parameters and compensation parameters, and these errors will lead to errors in the calculated value of mutual inductance
When the error accumulation is large, it may cause the calculated value of mutual inductance to deviate far from the actual value, and if the calculated value of mutual inductance with large error is included in the system control, it may affect the system performance

Method used

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  • Mutual inductance detection method of wireless charging system, control method and corresponding system
  • Mutual inductance detection method of wireless charging system, control method and corresponding system
  • Mutual inductance detection method of wireless charging system, control method and corresponding system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] see figure 1 , which shows a method flowchart of a mutual inductance detection method for a wireless charging system.

[0057] Please also refer to figure 2 , which shows a schematic structural diagram of a wireless charging system, the wireless charging system includes a transmitting end and a receiving end, and the transmitting end includes a transmitting coil L P , the receiving end includes a receiving coil L S , compensation capacitor C 1 , compensation inductance L 1 and a full-bridge rectifier circuit 1, the transmitting coil L P and the receiving coil L S They are the primary coil and the secondary coil of the loosely coupled transformer, that is, the energy transmitting device and the receiving device, and the currents are I P and I S . The transmitter also includes a full-bridge inverter circuit 2, wherein the full-bridge rectifier circuit 1 is composed of four switching tubes Q S1 , Q S2 , Q S3 and Q S4 connected in the form of an electric bridge...

Embodiment 2

[0094] See Figure 5 , which shows a method flowchart of a wireless charging control method, the method includes steps S21 and S22, specifically as follows:

[0095] S21. Obtain a mutual inductance parameter of the wireless charging system through a mutual inductance detection method of the wireless charging system.

[0096] Preferably, when the mutual inductance detection method of the wireless charging system is specifically implemented, the implementation manners of steps S11 to S16 in the first embodiment can be adopted accordingly, so this embodiment will not be described repeatedly.

[0097] S22. Control system parameters of the wireless charging system to adjust according to the mutual inductance parameters, so as to improve system performance.

[0098] Because the electric energy transmission of the wireless charging system is to transfer energy through a pair of coupled transmitting coil and receiving coil. In practical applications, there is a large gap between the...

Embodiment 3

[0101] See Figure 6 , which shows the system configuration diagram of the mutual inductance detection system of the wireless charging system, the wireless charging system includes a transmitting end and a receiving end, and the transmitting end includes a transmitting coil L P , the receiving end includes a receiving coil L S , compensation capacitor C 1 , compensation inductance L 1 and a full-bridge rectifier circuit 1, the transmitting coil L P and the receiving coil L S They are the primary coil and the secondary coil of the loosely coupled transformer, that is, the energy transmitting device and the receiving device, and the currents are I P and I S . The transmitter also includes a full-bridge inverter circuit 2, wherein the full-bridge rectifier circuit 1 is composed of four switching tubes Q S1 , Q S2 , Q S3 and Q S4 connected in the form of an electric bridge, and the full bridge inverter circuit 2 is also composed of four switching tubes Q P1 , Q P2 , Q ...

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Abstract

The invention discloses a mutual inductance detection method of a wireless charging system, a control method and a corresponding system, and the mutual inductance detection method of the wireless charging system comprises the steps: controlling a full-bridge rectification circuit of a receiving end to be in a short-circuit state, and controlling the wireless charging system to work in a frequency conversion manner in a preset frequency range, and identifying the resonant frequency points of a compensation capacitor and a compensation inductor of the receiving end, and calculating the mutual inductance value of the wireless charging system by combining the measured electrical parameters at the resonant frequency points, i.e., the current current value on the transmitting coil and the current voltage values at the two ends of the compensation inductor of the receiving end. According to the invention, the compensation inductance of the receiving end and the electrical parameters when the compensation capacitance resonates or approaches resonance are obtained to obtain a relatively accurate mutual inductance value, so that the engineering error of the compensation parameters of the receiving end can be eliminated, and the detection precision is greatly improved; and the accurate mutual inductance value is brought into system control, so that the performance and the stability of the system are greatly improved.

Description

technical field [0001] The present invention relates to the technical field of wireless charging, in particular to a mutual inductance detection method, a control method and a corresponding system of a wireless charging system. Background technique [0002] The application of wireless charging technology in the field of electric vehicles has gradually become popular. In engineering applications, the position between the ground equipment and the on-board equipment is in an uncertain state depending on the parking state, and the vehicle chassis will also vary depending on the state of the vehicle. This causes the horizontal offset distance and vertical distance (ground clearance) between the primary and secondary coils of the loosely coupled transformer of the wireless charging system to change within a certain range, resulting in the mutual inductance value of the loosely coupled transformer Change accordingly. In engineering applications, in order to improve the stability a...

Claims

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Application Information

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IPC IPC(8): H02J50/10H02J50/12H02J7/00G01R31/00
CPCH02J50/10H02J50/12H02J7/00G01R31/006Y02T10/70Y02T90/14Y02T10/7072
Inventor 刘玮胡超罗勇
Owner ZTEV
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