Power factor corrected SMPS with light and heavy load control modes
US6714425B2 · kind B2 · utility
106Cited by
9References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 16, 2002 |
| Grant date | Mar 30, 2004 |
| Priority date | — |
| Expiry date | Sep 16, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P80/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In the switching power supply, a load state judgment circuit (25) judges the state of a load (20) according to a pulse signal VG to be used for ON/OFF control of a MOS transistor (8) as a switching element in a DC—DC converter (127). In order to reduce a power consumption of the switching power supply, a PFC ON/OFF switching circuit (24) stops the operation of the power factor improving converter (126) when the judgment result indicates a light load state, and starts the operation of the power factor improving converter (126) when the judgment result indicates a heavy load state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.