| 摘要 |
When a relay (21) is controlled, an AC voltage (1) may be rectified in a full-wave rectification fashion. In a voltage-doubler rectification fashion, and a rectified output supplied to a main converter (6) or the AC voltage (1) may be rectified in a half-wave rectification fashion, and a rectified output supplied to a standby converter (10). A just detection circuit (23) detects a rectified voltage of the standby side, and a detection circuit (24) may detect a rectified voltage supplied to the main converter (6). The first and second voltage detection circuits (23) and (24) control operations of relay drive circuits (21D and 22D) based on both detection signals so that any one of two relay contacts (21a and 22a) may be turned on. Since a voltage of the rectified output supplied to the main converter (6) may be detected and its detection signal also may be used for control, a detection timing can be made fast so that, even when the voltage of the commercially-available voltage is fluctuated suddenly, the rectification systems can be switched immediately.
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