| 摘要 |
Capacitors ( 4, 6 ) are connected in series across a DC power supply ( 2 ). IGBTs ( 8, 10 ) are connected in series across the DC power supply ( 2 ), too. The IGBTs ( 8, 10 ) are rendered conductive alternately. A transformer ( 12 ) is connected between the junction of the capacitors ( 4, 6 ) and the junction of the IGBTs ( 8, 10 ). Snubber capacitors ( 32, 38 ) are connected in parallel with the IGBTs ( 8, 10 ), respectively. Diodes ( 34, 40 ) are connected in series with respective ones of the snubber capacitors ( 32, 38 ) in such a manner that said snubber capacitors ( 32, 38 ) can be charged when the IGBTs ( 8, 10 ) are rendered nonconductive. A secondary winding ( 54 SA) of a transformer ( 54 ) is connected between the DC power supply ( 2 ) and the junction of the snubber capacitor ( 32 ) and the diode ( 34 ), and converts a secondary voltage of the transformer ( 12 ) and returns the converted voltage to the DC power supply ( 2 ) when the IGBT ( 8 ) is conductive. A secondary winding ( 54 SB) of the transformer ( 54 ) is connected between the DC power supply ( 2 ) and the junction of the snubber capacitor ( 38 ) and the diode ( 40 ), and converts a secondary voltage of the transformer ( 12 ) and returns the converted voltage to the DC power supply ( 2 ) when the IGBT ( 10 ) is conductive.
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