| 摘要 |
<P>PROBLEM TO BE SOLVED: To downsize a cooler by enabling the reduction of the loss due to a semiconductor element without marring the reliability on power ripple compensation. <P>SOLUTION: In an AC-AC converter composed of a power rectifier and an inverter, at least one bidirectional switch 13, which can control the conduction and break of both forward and reverse currents, being composed of one or more semiconductor switches, is connected between any of the serial connection points of semiconductor switches within the power rectifier and any of the serial connection points of the semiconductor switches within the inverter. The bidirectional switch 13 is made conductive with the timing of the potentials at both ends of the bidirectional switch 13 being equal to each other, and when the voltage and frequency of the AC input of the power rectifier are within specified ranges, the switching actions of the power rectifier and the inverter are stopped. <P>COPYRIGHT: (C)2007,JPO&INPIT |
