Control circuit and method of a LED driver
US9781786B2 · kind B2 · utility
33Cited by
0References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 27, 2016 |
| Grant date | Oct 3, 2017 |
| Priority date | — |
| Expiry date | Jan 27, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/382
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A control circuit of a LED driver utilizes a counter to acquire a cycle and a conduction time or a non-conduction time of an AC phase-cut voltage outputted by a TRIAC dimmer. A bleeding signal is determined according to the cycle and the conduction time or the non-conduction time and used for adjusting a bleeding current so as to avoid a flickering of the LED. The control circuit does not need extra pins for coupling a large capacitor, but the bleeding signal can be still acquired. Preferably, the present invention is suitable for an IC of low pin numbers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.