Primary side sampled feedback control in power converters
US7859859B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 20, 2006 |
| Grant date | Dec 28, 2010 |
| Priority date | — |
| Expiry date | Jan 4, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A primary-side sampled feedback system includes a sample acquisition phase during which the voltage across the clamp capacitor is sensed as a measure of the primary-reflect output voltage. One end of the clamp capacitor is ground-referenced during the sample acquisition phase. The sample circuitry, which may include a transformer-coupled input for receiving the gate drive of the secondary switch, may use secondary-side or primary and secondary side signals to generate the sample acquisition control pulse and clamp switch drive signal. The sample acquisition control pulse occurs when the secondary current reaches its minimum or zero.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.