| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an AC-DC converter for directly switching an AC current, which is improved so as to suppress an even number harmonic current in an AC current switching circuit by matching the currents of a positive half-wave and a negative half-wave of an AC current. <P>SOLUTION: In an AC-DC converter including an AC power supply 1, a reactor 2, first to fourth diodes 3 to 6 which constitute a bridge rectifier, a first capacitor 7, and a load 8, a first switch element 9, and a second switch element 10 are connected to a first diode 3 and a second diode 4 in parallel, respectively. A first resistance 11 is inserted into a first capacitor 7 in series, and detection circuits 13 and 14 for detecting voltages at both ends of the first resistance 11 are added. An oscillation control circuit 12 is added to turn on the first switch element 9 and the second switch element 10 simultaneously in synchronization with output signals from the detection circuits 13 and 14, and to maintain an on-period constant at least during one AC period of the AC power supply 1. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
