Power device
AssigneeMatsushita Electric Works, Ltd.
InventorsIsao Takahashi, Masataka Mitani
Life of this patent
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Abstract
A power device of improved input power-factor, reduced high frequency noise with rush current upon power source connection restrained, reduced switching loss and improved circuit efficiency is provided by an arrangement in which an output of a full-wave rectifying circuit is subjected to a high-frequency interruption through a switching means, an energy accumulated in an inductor connected to the switching means is applied through another switching means to a smoothing capacitor, and a current from the full-wave rectifying circuit so as to flow to the capacitor is interrupted by still another switching means.
Claims9
A power device comprising:
- a full-wave rectifying circuit for full-wave rectifying AC power and producing a DC output,
- switching means for adding a frequency to the DC output of said full-wave rectifying circuit through high-frequency interruption of the DC output,
- inductor means connected through said switching means to the DC output of said full-wave rectifying circuit,
- a first reverse-current preventing element connected to said inductor means,
- a smoothing capacitor connected to said inductor means through said first reverse-current preventing element,
- a second reverse-current preventing element connected to prevent a current from flowing from said full-wave rectifying circuit to said smoothing capacitor, and
- a load circuit connected through said switching means and said second reverse-current preventing element to said smoothing capacitor.
Dependencies are inferred from the claim text.