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这个波形很正常,电感电流断续波形。负电流是因为二极管的结电容和L1谐振所致。---此时开关管关断了,电流下降到零后,会因为电压和电流的相位差关系,发生谐振。也就是说电流过零瞬间,电感两端电压并不为零,因此电流就会反向,所以会有负电流出现。