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:
Jun. 23, 2009
Filed:
Apr. 13, 2006
Masahiro Uehara, Mishima, JP;
Masahiro Uehara, Mishima, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A power supply device includes a plurality of DC voltage generating circuits that share a voltage control circuit controlling a voltage to be supplied to a voltage stabilizing capacitor. The voltage control circuit and the DC voltage generating circuits are controlled so that supplying voltage to the capacitor is stopped to stop output, that a first DC voltage generating circuit among the plurality of DC voltage generating circuits is driven for a predetermined time period and is then stopped, and that supplying voltage to the capacitor is started and also a second DC voltage generating circuit among the plurality of DC voltage generating circuits starts to be driven to output a positive bias, in order to sequentially perform a stop of output from the first DC voltage generating circuit and a start of output from the second DC voltage generating circuit. Accordingly, overshoot of an output voltage is prevented.