逆变桥无死区控制技术研究  

Study on No-dead-time Control Scheme for Inverter Bridges

作　　者：王亚芳[1,2] 韩春阳[1] 谢少军[1] 

机构地区：[1]南京航空航天大学,江苏南京210016 [2]南通大学,江苏南通226019

出　　处：《电力电子技术》2010年第2期32-33,76,共3页Power Electronics

摘　　要：分析了逆变器的死区效应,给出了桥式逆变器无死区控制方案。根据电流极性将桥臂等效为2个开关单元,无需设置死区时间。采用桥臂反并联二极管导通方法检测桥臂输出电流方向,无需电流传感器,降低了成本。采用简单的模拟电路设计了无死区控制的逻辑电路,以半桥逆变器为例进行了实验研究。实验结果表明,该控制方案可以明显改善逆变器的输出波形,提高直流电压利用率,开关管驱动信号只在半个基波周期内有效,开关损耗显著降低,有很好的实用价值。The dead-time effects of an inverter is analyzed,and a no-dead-time control scheme is presented for the bridge inverter.According to current polarity,a phase-leg can be decomposed into two switching cells without dead-time.The current direction can be determined by detecting the on-state of anti-parallel diode in a phase-leg,without expensive current sensor.A logic circuit based on the no-dead-time control is designed by a simple analog circuit,and the experiment is done with a half-bridge inverter.The experimental results verify that the output waveform is improved significantly,DC voltage utilization ratio is increased,and switching loss is reduced markedly as each drive signal is only effective for a half of fundamental cycle.

关 键 词：逆变器 死区效应 无死区控制 

分 类 号：TM464[电气工程—电器]