The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 05, 1999
Filed:
May. 29, 1997
Kazuo Hasegawa, Miyagi-ken, JP;
Alps Electric Co., Ltd., Tokyo, JP;
Abstract
Power supply circuitry is disclosed which suppresses changes in a converted voltage regardless of changes in a load state without substantially increasing the volume and weight of the power supply circuitry and raising the manufacturing cost. The circuitry has a direct current power source. A first DC-to-DC converter converts a voltage of the direct current power source. A smoothing filter smoothes the converted voltage of the first DC-to-DC converter and outputs it. The power supply circuitry further includes a power supply section. The power supply section has a voltage detecting portion for detecting a decrease in the converted voltage and outputs a voltage-decrease detection signal. A power holding portion charges capacitor devices with the converted voltage or a voltage of the direct current power source, and discharges the capacitor devices when a voltage-decrease detection signal is output. A second DC-to-DC converter converts an output of the power holding portion and synthesizes the converted output with the converted voltage of the first DC-to-DC converter. A predetermined voltage at which the voltage-decrease detection signal starts to be generated is set lower than the internal control voltage of the first DC-to-DC converter.