Power supply apparatus
AssigneeFujitsu Limited
InventorsKazunori Hayami, Yoshiyasu Nakashima, Yu Yonezawa
Life of this patent
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Abstract
A power supply apparatus includes a power supply section and a control section. The power supply section includes a first switch which performs switching of power-supply output, an inductor and a capacitor which form an LC circuit that resonates current flowing through the first switch, and a second switch which changes capacitance of the capacitor. The control section finds in advance a correspondence between a time ratio of a switching pulse of the first switch and a resonance frequency which matches an edge of a switching pulse having each time ratio, and controls switching of the second switch so as to resonate the LC circuit at a resonance frequency corresponding to a time ratio at operation time.
Claims5
A power supply apparatus comprising:
- a power supply section including:
- a first switch which performs switching of power-supply output;
- an inductor and a capacitor which form an LC circuit that resonates current flowing through the first switch;
- and
- a second switch which changes capacitance of the capacitor;
- and
- a control section which finds in advance a correspondence between a time ratio of a switching pulse of the first switch and a resonance frequency that matches an edge of a switching pulse having each time ratio and which controls switching of the second switch so as to resonate the LC circuit at a resonance frequency corresponding to a time ratio at operation time.
Dependencies are inferred from the claim text.