Electrical device e.g. frequency converter for switching power supply, has common-mode rejection choke to avoid saturation of magnetically effective core when pulse duration in starting phase is larger than that in steady operation phase

摘要: The device (1) has an inverter (6) which direct current voltage terminals (15A,15B) coupled via common-mode rejection choke (8) to power supply and output (18A-18C) pulse sequence including alternating pulses of different polarity. duration in starting phase is shorter than steady operation phase. provided avoid saturation magnetically effective core when larger