Power supply circuit
AssigneeCasio Computer Co., Ltd.
InventorRyuichi Hirayama
Life of this patent
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Abstract
A power supply circuit includes at least one capacitor, a plurality of switching members, a power supply which outputs a plurality of voltages and a selecting section for controlling said plurality of switching sections to periodically select one of said plurality of voltages and apply the selected voltage to one terminal and the other terminal of the capacitor. The selecting section includes a member for applying the selected voltage to one terminal and the other terminal of the capacitor across a resistor, during a current limiting period immediately after the application of the selected one of said plurality of voltages to one terminal and another terminal of the capacitor is started.
Claims14
A power supply circuit comprising:
- at least one capacitor;
- a plurality of switching members;
- a power supply which outputs a plurality of voltages;
- and
- a selecting section for controlling said plurality of switching sections to periodically select one of said plurality of voltages and apply the selected voltage to one terminal and the other terminal of the capacitor,
- wherein the selecting section comprises a member for applying the selected voltage to one terminal and the other terminal of the capacitor across a resistor, during a current limiting period immediately after the application of the selected one of said plurality of voltages to one terminal and another terminal of the capacitor is started.
A method of driving a power supply circuit, comprising:
- the power supply circuit comprising a capacitor;
- periodically selecting one of a plurality of voltages and applying the selected voltage to one terminal and the other terminal of the capacitor;
- applying the selected one of said plurality of voltages to one terminal of the capacitor across a resistor, during a current liming period immediately after the application of the selected voltage to one terminal and the other terminal of the capacitor is started;
- and
- directly applying one of said plurality of voltages to one terminal and the other terminal of the capacitor after the current limiting period has passed.
Dependencies are inferred from the claim text.