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Improved pulse width control method for five switches H bridge inverter
Received:September 30, 2018  Revised:November 23, 2018
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Keywords:five level inverter  five switches H-bridge inverter  unipolar frequency doubling  carrier phase shift pulse width modulation  
Fund Project:The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)
yemanyuan School of Electrical and Automation Engineering,East China Jiaotong University yemanyuan1@163.com
zhangjunfei East China jiaotong University 、Electrical and Automation Engineering School, 897393765@qq.com
chenle East China jiaotong University 、Electrical and Automation Engineering School 1317615934@qq.com
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      In order to solve the problem that the traditional cascaded five-level inverter requires many switching devices, this paper introduces a five-switch h-bridge inverter topology that combines an auxiliary switching circuit with an h-bridge circuit. According to the characteristics of the working principle of this topology, the PWM modulation strategy is studied, and an improved PWM control method based on carrier phase-shifting pulse width modulation is proposed. According to the two-cell H bridge cascade, the waveform of five-level phase voltage is obtained by the single-pole frequency doubling cps-pwm modulation method, and the five-level voltage waveform is taken as the output target waveform of the five-switch h-bridge inverter. Finally, the feasibility and validity of the topology structure and control method are proved by simulation and experiment.