SOFT-SWITCHING POWER CONVERTING APPARATUS

摘要

Provided is a soft-switching power converting apparatus wherein a magnetic energy regenerative switch, in which a magnetic energy storage capacitor of a small capacitance is connected between the DC terminals of a bridge circuit comprising at least two reverse conductivity type semiconductor switches, is used to provide a soft-switching mechanism for the switching operations of the semiconductor elements for use in all switchings and wherein a raised pulse voltage of a high frequency generated by the magnetic energy regenerative switch is used as the voltage of a DC link part and then converted to a DC voltage or to a AC voltage of any desired low frequency again by use of a filter and a switching control means. In this way, a reversible power converting apparatus can be realized which provides the soft-switching mechanism for the switching operations of the semiconductor elements for use in all switchings so as to raise or reduce the output voltage and which can be composed of a relatively small number of components with simple control means used.