描述
一个单相光伏逆变器的典型全桥逆变电路,为尽可能地降低igbt的损耗,有时pwm控制策略使上桥臂igbt1/igbt3的开关频率设定为电网频率(例如50hz),而下桥臂的igbt2/igbt4则工作在较高的开关频率下,来实现输出正弦波。这样的工作模式对全桥逆变中的4个igbt单元的性能要求是不尽相同的。因为上桥臂工作在工频开关频率,所以对igbt1/igbt3要求具有低的饱和压降vce(sat),以降低系统的通态损耗,同时尽量降低二极管的反向恢复损耗,要求二极管具有快的恢复时间或者采用sic二极管;因为下桥臂的igbt单元工作在高频下,所以对igbt2/igbt4要求尽可能快的关断速度以降低开关损耗。
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