Method and apparatus for controlling the charge of a bootstrap capacitor for non-synchronous type DC-DC converter
US7321258B2 · kind B2 · utility
7Cited by
2References
14Claims
0Family size
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Inventors
Key dates
| Filing date | Jul 29, 2005 |
| Grant date | Jan 22, 2008 |
| Priority date | — |
| Expiry date | Mar 17, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of controlling the charge of the bootstrap capacitor during light load or no load conditions for a non-synchronous type of DC-DC converter consists of bootstrap capacitor voltage detector, light load detector and secondary switch controller. By turning on the secondary switch during the off-time of the power transistor when the bootstrap voltage is lower than the required value under light load condition, the bootstrap capacitor voltage will be able to charge back to the required value, yet minimizing the minimum current requirement for the DC-DC converter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.