Frequency limitation method with time hysteresis used in quasi-resonant control
US8238123B2 · kind B2 · utility
6Cited by
2References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 16, 2010 |
| Grant date | Aug 7, 2012 |
| Priority date | — |
| Expiry date | Mar 16, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A frequency limitation method used in quasi-resonant control of a switching regulator is disclosed. The switching frequency is limited through setting a minimum time limit, such as a minimum switching period or a minimum OFF time. The minimum time limit may be a first time limit or a second time limit. The minimum time limit is changed into another value if the minimum voltage point approaches the minimum time limit point, so as to eliminate the audible noise.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.