Pulse-width modulation (PWM) output method for solving problem of nonuniform heating of bridge arm switch of single-phase full-bridge inverter circuit

A single-phase full bridge and circuit bridge technology, applied in the control field, can solve the problems of disparity in the operating frequency of the two bridge arms, uneven heating of the switches of the two bridge arms, etc., and achieve the effects of overcoming the failure of switching devices, prolonging the service life, and improving reliability

Inactive Publication Date: 2012-07-25
FUZHOU UNIV
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Problems solved by technology

Therefore, the existing inverter output mode has the disadvantage of uneven heating of the switches of the two bridge arms due to the great disparity in the operating frequencies of the two bridge arms.

Method used

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  • Pulse-width modulation (PWM) output method for solving problem of nonuniform heating of bridge arm switch of single-phase full-bridge inverter circuit
  • Pulse-width modulation (PWM) output method for solving problem of nonuniform heating of bridge arm switch of single-phase full-bridge inverter circuit
  • Pulse-width modulation (PWM) output method for solving problem of nonuniform heating of bridge arm switch of single-phase full-bridge inverter circuit

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Embodiment Construction

[0012] This embodiment provides a PWM voltage output method to solve the uneven heat generation of the switches of the two bridge arms of the single-phase full-bridge inverter circuit. . That is, the previous cycler let figure 1 The left bridge arm outputs PWM wave voltage, and the right bridge arm outputs square wave voltage. In the next cycle, the left bridge arm outputs square wave voltage, and the right bridge arm outputs PWM wave voltage. Such an alternate output mode not only maintains The output voltage waveform remains unchanged, and the heating of the switches of the two bridge arms is balanced, so that the temperature of the overheated switch is significantly reduced, and the failure of the switching device caused by overheating is effectively overcome.

[0013] Next, we take the implementation of DSP controller control as an example to realize the two bridge arms of the single-phase full-bridge inverter circuit to alternately output PWM wave and square wave voltage...

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Abstract

The invention relates to a pulse-width modulation (PWM) output method for solving the problem of nonuniform heating of a bridge arm switch of a single-phase full-bridge inverter circuit. The PWM output method is characterized in that two bridge arms use the modulation wave period T as an interval for alternately outputting PWM waves and square wave voltage. The problem of nonuniform heating caused by great work frequency differences of two bridge arm switches is solved, the temperature of an overheat switch is obviously reduced, insulated gate bipolar translator (IGBT) power switch device faults caused by overheat is effectively overcome, the reliability of a switch device is favorably improved, and the service life is prolonged.

Description

technical field [0001] The invention relates to control fields such as motors and electrical appliances, power electronics, and DSP technology, in particular to a PWM output method for solving uneven heating of bridge arm switches of a single-phase full-bridge inverter circuit. Background technique [0002] Single-phase DC-AC inverter is usually realized by single-phase full-bridge circuit, which is composed of two bridge arms, such as figure 1 shown. During the inverter process, one bridge arm fixedly outputs unipolar PWM voltage (the voltage wave at point a of the left bridge arm), and the other bridge arm outputs a fixed power frequency (50 / 60HZ) alternating square wave voltage (the right bridge arm Voltage wave at point b), the voltage U between the two bridge arms a and b ab After LC filtering, it is a pure single-phase sinusoidal AC output voltage U AB , the voltage changes periodically with the frequency of the modulating wave. [0003] However, the frequency of P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02M1/32
Inventor 王榕生汤宁平黄灿水林珍
Owner FUZHOU UNIV
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