Switching power supply apparatus
US8149598B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 5, 2009 |
| Grant date | Apr 3, 2012 |
| Priority date | — |
| Expiry date | Nov 17, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/33507
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switching power supply apparatus according to the present invention includes a switching device and a control circuit, and the control circuit includes: a control terminal through which an auxiliary power voltage is supplied; an error amplifier which generates a difference voltage depending on a difference between a control terminal voltage and a first reference voltage; a device current detection circuit which generates a device current detection signal indicating an amount of a current flowing in the switching device; a drive circuit which generates a drive pulse signal having a duty cycle based on a difference between the difference voltage and the device current detection signal and drives the switching device by using the generated drive pulse signal; and a dummy load circuit through which a dummy load current flows from the control terminal when the difference voltage becomes equal to or higher than a second reference voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.