Power supply apparatus, its control method and image formation apparatus
US6236579A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 3, 2000 |
| Grant date | May 22, 2001 |
| Priority date | — |
| Expiry date | Jul 3, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/36
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a power supply apparatus which supplies a high-tension alternating voltage to a load, field-effect transistors (N-MOS) are disposed between both ends of a converter transformer having a center tap and the ground respectively, and a field-effect transistor (P-MOS) is disposed between the center tap and a power supply. In an ordinary operation, a transistor connected to the center tap is being on and transistors at the both ends of the converter transformer are alternately switched at the same frequency by a converter transformer driving circuit, thereby generating the high-tension alternating voltage on the side of a secondary winding of the converter transformer. When the generation of the high-tension alternating voltage is stopped, the driving circuit is controlled to cause the transistor connected to the center tap to be off and cause the transistors at the both ends of the converter transformer to be on, thereby preventing an unstable output voltage generated when output oscillation is stopped.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.