High power factor, electrolytic capacitor-less driver circuit for light-emitting diode lamps
US9338843B2 · kind B2 · utility
0Cited by
1References
9Claims
0Family size
Inventors
Key dates
| Filing date | Mar 19, 2014 |
| Grant date | May 10, 2016 |
| Priority date | — |
| Expiry date | Mar 19, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/375
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A driver circuit for use with LED lamps. The driver circuit uses a rectifier, a power factor correction subcircuit, a voltage conversion subcircuit, and a semiconductor switch. The power factor correction subcircuit uses a film capacitor instead of an electrolytic capacitor. As well, the power factor correction subcircuit uses either an inductor or a transformer to shape the incoming current to a substantially sinusoidal waveform that is in phase with the input AC current. The semiconductor switch provides a high frequency pulsating triangular current at the output of the rectifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.