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Unipolar SPWM current control method for two-module wireless charging system

A technology of wireless charging and control methods, applied in the direction of control/regulation systems, high-efficiency power electronic conversion, electrical components, etc., can solve the problems of output control and no practical application, and achieve the effect of reducing the increase of current

Active Publication Date: 2020-12-15
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Modular wireless energy transfer technology is conducive to breaking through the power limitation of traditional single-channel wireless charging, but due to the complex cross-coupling between different modules, it is difficult to control the output of one module independently, so there is no practical application at present.

Method used

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  • Unipolar SPWM current control method for two-module wireless charging system
  • Unipolar SPWM current control method for two-module wireless charging system
  • Unipolar SPWM current control method for two-module wireless charging system

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Embodiment Construction

[0024] A unipolar SPWM current control method for a two-module wireless charging system of the present invention, the two-module wireless charging system contains two independent wireless charging modules, each module includes a transmitting coil, a receiving coil and a Set of independent primary and secondary circuits and the control loop of the module. The unipolar SPWM control method is adopted for the inverter on the input side. The upper and lower switch tubes of the same bridge arm of the inverter are given complementary control signals, and one of the bridge arms is used as the direction arm, and the other bridge arm is used as the chopper arm. For the first module, the direction arm of the full-bridge inverter on the input side adopts a complementary square wave control signal. When the amplitude of the modulation wave is greater than 0, a turn-on signal is given to the upper switch, and a turn-off signal is given to the lower switch; If the amplitude value is less tha...

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Abstract

The invention discloses a unipolar SPWM current control method of a two-module wireless charging system. The unipolar SPWM current control method of the invention is based on the outer loop of outputcurrent and the inner loop of the difference value of transmitting coil current and transmitting coil average current; the feedback items of each control loop are determined through an inequality which judges a feedback relationship through the magnitude of mutual inductance, so that the independent control of the output current of each module can be realized. Output end joint control suitable foran offset condition is provided. According to the method, the output current and power of two wireless charging modules can be independently controlled; and the universality of the method is not affected by different resonant cavity parameters, any coil mutual inductance parameters and deviation. With the method adopted, the independent control over the output current of the receiving end of eachmodule can be realized, and the independent control over the output of the two wireless charging modules can be realized without additionally arranging elements in the main power loop of the system.

Description

technical field [0001] The invention belongs to the technical field of wireless charging, and relates to a unipolar SPWM current control method of a two-module wireless charging system. Background technique [0002] With the increasingly serious problems of energy shortage and environmental pollution worldwide, the importance of developing electric vehicles has become increasingly prominent. Wireless charging technology for electric vehicles has attracted much attention due to its advantages of high efficiency, convenience, low maintenance cost, and no environmental impact. Although the current low-power wireless charging technology has been developed to a certain extent, high-power wireless fast charging is still under study. Modular wireless energy transfer technology is conducive to breaking through the power limitation of traditional single-channel wireless charging, but due to the complex cross-coupling between different modules, it is difficult to control the output o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J50/40H02M3/335
CPCH02M3/33569H02J50/40Y02B70/10
Inventor 钟文兴徐德鸿朱晨李豪
Owner ZHEJIANG UNIV
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