US Patent 8102157 Multi-output power supply device having charge pump circuit
Patent 8102157 was granted and assigned to RICOH COMPANY,LTD. on January, 2012 by the United States Patent and Trademark Office.
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A multi-output power supply device of low noise is disclosed that converts a first input voltage to plural different voltages. The multi-output power supply device includes a first power supply circuit for generating a constant voltage from the first input voltage, and outputs the constant voltage through a first output terminal; and one or more second power supply circuits each including a charge pump circuit for generating a constant voltage from the output voltage from the first power supply circuit. Each of the second power supply circuits changes a period of a charging and discharging cycle for charging and discharging a flying capacitor according to an electric current output from the second output terminal.
US Patent 08102157 Multi-output power supply device having charge pump circuit US Patent 8102157 Multi-output power supply device having charge pump circuit
US Patent 08102157 Multi-output power supply device having charge pump circuit
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