Driving circuit of light emitting diode
US8704451B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 7, 2011 |
| Grant date | Apr 22, 2014 |
| Priority date | — |
| Expiry date | May 24, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/355
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A driving circuit of a light emitting diode (LED) including an AC power, a rectifier, a power converter, a waveform sampler, and a control circuit is provided. The AC power provides an AC signal. The rectifier is coupled to the AC power and outputs a driving signal. The power converter is coupled to the rectifier. The power converter includes an LED and outputs a first signal positive correlated with a current passing through the LED. The waveform sampler is coupled between the AC power and the rectifier, and outputs a second signal directly proportional to the AC signal. The control circuit is coupled between the waveform sampler and the power converter, and outputs a control signal to the power converter according to a comparison result between the first signal and the second signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.