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Method for suppressing power frequency ripple of wireless power supply system through phase modulation

A wireless power supply and phase modulation technology, applied in electrical components, circuit devices, high-efficiency power electronic conversion, etc., can solve problems such as affecting system performance and low efficiency, avoiding system impact, reducing production costs, and improving system efficiency and reliability. sexual effect

Inactive Publication Date: 2021-08-24
LUDONG UNIVERSITY
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The main problem facing wireless power transmission at present is low efficiency. Its power consumption is mainly caused by coil magnetic flux leakage and multi-stage power converters. Reducing the number of power conversion stages is an effective solution to further improve efficiency. Power frequency AC / DC, high High-frequency DC / AC and high-frequency AC / DC are essential three-level power conversion, which can subtract high-frequency DC / DC power conversion, and adjust the power frequency AC / DC output voltage to meet the needs of system voltage and current changes, but The problem we are facing is the impact of 2 times the power frequency ripple, which will bring large power frequency fluctuations in voltage and current at the output of the system, affecting system performance

Method used

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  • Method for suppressing power frequency ripple of wireless power supply system through phase modulation
  • Method for suppressing power frequency ripple of wireless power supply system through phase modulation
  • Method for suppressing power frequency ripple of wireless power supply system through phase modulation

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Embodiment Construction

[0024] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0025] figure 1 It is the overall schematic diagram of the wireless power transmission system of the method of the present invention, the system has power frequency AC input, DC stabilized voltage or steady current output, and the middle consists of EMI, power frequency AC / DC, high frequency DC / AC, high frequency AC / DC, high frequency AC / DC, secondary filter circuit and coupling coil and its compensation circuit, the coupling coil and its compensation circuit include primary coupling coil, primary compensation network and secondary coupling coil, secondary compensation network; signal acquisition includes system output voltage acquisition, Output current acquisition and power frequency AC / DC output DC bus voltage acquisition.

[0026] The EMI module is used to filter the high-frequency current ripple at the input terminal of the power frequency AC / DC module to reduc...

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Abstract

The invention provides a method for suppressing power frequency ripples of a wireless power supply system through phase modulation, and the power frequency ripples are that the output voltage of a rectification line contains voltage fluctuation which is two times of the power frequency. According to the method for suppressing the power frequency ripple of the wireless power supply system through phase modulation, the PWM phase of a full-bridge inverter circuit of a high-frequency DC / AC is modulated according to the change of the output voltage of a power frequency AC / DC rectifying circuit, and the purpose of suppressing the influence of the power frequency ripple at the receiving end voltage or current of power is achieved. The method has the beneficial effects that the power conversion stage number is reduced, the system efficiency is improved, and the production cost is reduced.

Description

technical field [0001] The invention relates to a power converter in the field of wireless power supply, in particular to eliminating the influence of power frequency ripple after rectification through high-frequency DC / AC phase modulation. Background technique [0002] Wireless power transmission systems usually have 4 levels of power conversion and power coupling lines: power frequency AC / DC, high frequency DC / AC, high frequency AC / DC, high frequency DC / DC and coupling coils and their compensation lines. [0003] Power frequency AC / DC is responsible for converting power frequency AC into DC voltage, adopting active power factor adjustment circuit, so that it has a higher power factor and reduces reactive components, but the DC bus inevitably has a certain 2 times the power frequency ripple voltage. [0004] High-frequency DC / AC converts DC voltage into high-frequency AC, which further drives the wireless power transmission compensation line and its coupling coil. [0005...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J50/12H02M7/5387H02M1/38
CPCH02J50/12H02M7/5387H02M1/38Y02B70/10
Inventor 侯典立王洪刚
Owner LUDONG UNIVERSITY
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