Switch mode power supply using transformer flux sensing for duty cycle control
US6396718B1 · kind B1 · utility
80Cited by
8References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 19, 2000 |
| Grant date | May 28, 2002 |
| Priority date | — |
| Expiry date | Dec 19, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/33546
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switch mode power supply (200, FIG. 2; 600, FIG. 6) includes a transformer (208), a transistor (212) that drives the primary winding of the transformer, and a controller (210, 610). The controller senses whether or not the transformer is reset and applies a switching control signal to a control terminal (220) of the transistor, accordingly. The signal is produced at a switching frequency, and the signal has a duty cycle that is limited based on whether or not the transformer is reset.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.