中频发电机用逆变器的移相控制策略及实现

将二重移相SPWM控制策略与数字式SPWM调制器相结合,研制了一种适用于便携式中频发电机的低成本、高性能逆变器.采用二重移相的SPWM逆变桥控制策略,在不改变主电路结构的基础上,通过软件设计实现了PWM逆变电路的二重化,从而提高了等效开关频率,降低了开关损耗,节约了成本并提高了效率.实验结果表明,所设计的逆变器与发电机配合使用良好,各项指标均满足要求,输出电压波形畸变小,目前已用于实际生产中.

Phase-shifted Control Strategy of Inverter for Portable Medium Frequency Generator

A kind of cost-effective and high performance inverter for portable immediate frequency generator was develoed combining the dual phase-shifted SPWM control strategy with digital SPWM modulator.The control strategy realized by software design without changing the structure of main circuit can effectively improve the equivalent switching frequency,reduce the switching dissipation and get lower cost and higher efficiency.Experiment results prove that the inverter can work well with the generator,the output voltage,frequency and power satisfy the target of design task,the THD of output voltage is low.Now the power supply developed has been put into practical productiou.