Power supply device and image forming apparatus using the same
US7551871B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 13, 2006 |
| Grant date | Jun 23, 2009 |
| Priority date | — |
| Expiry date | Aug 2, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/36
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.