| 摘要 |
The present power supply device includes a microcomputer (18) that detects a current (Iin) input to an active filter (10), a voltage (Vin) input to the active filter (10), and a voltage (Vo) output from the active filter (10), decreases a target voltage (Vt) as the input current (Iin) increases, and controls an IGBT (13) to turn on/off the IGBT (13) to match the input current (Iin) and the input voltage (Vin) in phase with each other and also match the output voltage (Vo) to the target voltage (Vt). Thus, as the input current (Iin) increases, the target voltage (Vt) is decreased. A loss caused at the IGBT (13) can be reduced to be small.
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