| 摘要 |
PROBLEM TO BE SOLVED: To suppress reactor noise which is produced in synchronization with the short-circuit operation of a reactor, in a load near a boundary where the reactor short-circuit operation for adjustment of a DC power voltage begins to start.SOLUTION: In the DC power unit, a control unit 9 varies an ON period Δt (0≤t), with reference to a difference between the target DC voltage for controlling a DC voltage into a desired value and the output of a DC voltage detector, however, it is possible to avoid the alternate occurrence of a power cycle, when a current generated by short-circuiting the switching part flows to a reactor and a power cycle when it does not flow even in an input current, in the vicinity of the boundary between 0 and a value that begins to be larger than 0 with respect to the ON period Δt, by changing the variation of the ON period Δt between the time, when it decreases and the time when it increases. |
