Switching power supply unit and electronic apparatus having display
US7091705B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 6, 2004 |
| Grant date | Aug 15, 2006 |
| Priority date | — |
| Expiry date | Oct 6, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/156
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switching power supply unit for providing an output voltage that is controlled such that a first detection voltage detected on the basis of the output voltage becomes equal to a first reference voltage. The peak voltage at the node of a serially connected coil and a switch of the switching power supply unit is detected and used as a second detection voltage for over-voltage protection. Thus, over-voltage protection of the switching power supply unit is secured with no additional terminal on the switching control IC for over-voltage protection even if such components as a feedback circuit and a rectifying diode of the power supply unit become open.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.