Fixed frequency dimming method and fixed frequency dimming circuit for light emitting module
US8344636B2 · kind B2 · utility
2Cited by
1References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 19, 2010 |
| Grant date | Jan 1, 2013 |
| Priority date | — |
| Expiry date | Oct 15, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/3725
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A fixed frequency dimming method and fixed frequency dimming circuit for a light emitting module can control light emitting brightness of the light emitting module through a hysteresis control circuit. A voltage difference between an upper limit voltage and a lower limit voltage of a hysteresis width of the hysteresis control circuit is maintained at a fixed value, and a driving current flowing through the light emitting module is changed by changing the upper limit voltage or the lower limit voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.