Minebea Company, Limited

Takashi Kawai

Yoshihiro Nakamura

There is provided a method for controlling a switching power unit that converts AC input voltages of an AC source into a DC voltages while improving a power-factor of the AC input voltages, the switching power unit comprising an AC/DC converter circuit that is composed of a power-factor correction unit and a current resonance converter unit wherein at least a part of switching elements of the current resonance converter unit is shared with switching elements of the power-factor correction unit, wherein around timing that polarities of the AC source are switched between a positive half cycle and a negative half cycle, ON-and-OFF control of the switching elements are performed as that high frequency voltages that are applied to a primary winding of a high frequency transformer which is a part of the current resonance converter unit are to be symmetrical in a positive and negative relation.

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Kitasaku-gun, Japan

Takashi Kawai