Electronic circuit for DC conversion of fluorescent lighting ballast
US8330381B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 12, 2010 |
| Grant date | Dec 11, 2012 |
| Priority date | — |
| Expiry date | May 16, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Embodiments of an illumination device including LEDs for connection to an existing fluorescent lamp fixture including a conventional ballast described. One illumination device includes protection circuitry configured to protect the illumination device from the ballast current signal, a full-wave rectifier, a smoothing filter electrically coupled to the full wave rectifier, and a current regulator power circuit electrically coupled to the smoothing filter and the LEDS. The current regulator power circuit can include a first switching element configured to operate in response to a first (PWM) ON/OFF control signal; a current controller electrically coupled to a gate of the first switching element, the current controller configured to generate the first PWM control signal; and a current sense resistor electrically coupled to the first switching element and configured to sense the current through the LEDS, wherein the sensed current is fed back to the current controller.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.