单相半桥电压型逆变电路如下图所示，在 t1~t2时间段，开关管 V1.V2,的状态为 （0.5）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69421' and id < 4494903 and id<>'4494903' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69421' and id > 4494903 and id<>'4494903' order by id asc limit 5