Sine wave lamp controller with active switch commutation and anti-flicker correction
US7667991B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 19, 2007 |
| Grant date | Feb 23, 2010 |
| Priority date | — |
| Expiry date | Jul 19, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A pulse width modulated half bridge dimming controller is provided for dimming a lighting ballast is described. The top half of the bridge is comprised of two switches, the top switch set, and the bottom half of the bridge is comprised of two switches, the bottom switch set. Each switch also has a diode in parallel with it. The drivers for the switches are configured so that each of the switches can be turned on and off independently of all of all the other switches. Preferably, the controller is capable of operating in all four quadrants. In one preferred embodiment the switches are IGBTs. The switches are controlled in a manner so that when one of the switches sets changes states, the second switch set has one switch on and one switch off, so that one of the diodes in the second switch set is disposed to block shoot through and provide a path to allow current to continue flowing in the inductive load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.