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

A duty cycle modulation, wireless power supply technology, applied in electrical components, circuit devices, output power conversion devices, etc., can solve problems such as low efficiency and affect system performance, to avoid system impact, reduce production costs, and improve system performance. The effect of efficiency and reliability

Inactive Publication Date: 2021-08-24
LUDONG UNIVERSITY
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  • Summary
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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 po

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

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[0022] The present invention will be further described below with reference to the accompanying drawings:

[0023] Figure 1 For the method of the method of the present invention, the wireless power transmission system is integrally shown in the system, the system power frequency AC input, DC regulator or steady stream output, the intermediate by EMI, Power Frequency AC / DC, High Frequency DC / AC, High Frequency AC / DC, High Frequency AC / DC, sub-filter line and coupling coil and its compensation line, coupling coil, and its compensation lines contain primary coupled coils, primary compensation networks and secondary coupling coils, secondary compensation networks; signal acquisition includes system output voltage collection, Output current acquisition and power frequency AC / DC output DC bus voltage collection.

[0024] The EMI module is used to filter out high frequency current ripples in the input terminal of the power frequency AC / DC module and reduce electromagnetic in...

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Abstract

The invention provides a method for suppressing power frequency ripples of a wireless power supply system through PWM duty ratio modulation, and the power frequency ripples are voltage fluctuation which is two times of the power frequency of the output voltage of a rectification line. According to the method for suppressing the power frequency ripple of the wireless power supply system through PWM duty ratio modulation, the PWM duty ratio of a high-frequency DC/AC inverter line is modulated according to the change of the output voltage of a power frequency AC/DC rectifier line, 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 PWM duty ratio 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] High-frequ...

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Application Information

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IPC IPC(8): H02J50/12H02M1/08
CPCH02J50/12H02M1/08
Inventor侯典立王洪刚
OwnerLUDONG UNIVERSITY