| 摘要 |
PROBLEM TO BE SOLVED: To prevent a failure of a switch element included in a power factor improvement unit in the event of an instantaneous voltage drop or an instantaneous power failure.SOLUTION: While a power factor improvement unit (25) performs power factor improvement operation by stepping up an input voltage (V1), if an instantaneous voltage drop or an instantaneous power failure occurs in commercial power supply (91), an instantaneous stop control unit (31g) switches switching elements (Q25a, Q25b, Q25c) included in the power factor improvement unit (25) off, to stop the power factor improvement operation. The power factor improvement unit (25) also stops the power factor improvement operation when the commercial power supply (91) is restored. |
