Dimmable LED driver and methods with improved supplemental loading
US8922129B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 6, 2010 |
| Grant date | Dec 30, 2014 |
| Priority date | — |
| Expiry date | Oct 21, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In one general aspect, a dimmer power supply circuit is disclosed for use with single-pole dimmers that includes a first AC mains input line, second AC mains input line, and a rectification circuit responsive to the first and second AC mains input lines. A positive LED supply terminal responsive to the rectification circuit, and a negative LED supply terminal is responsive to the rectification circuit. At least one preload resistor is operatively connected in a first intermittent loading circuit path between two supply rails in the dimmer power supply circuit, and a peak detector is responsive to the first and second AC mains input lines. A first switching circuit includes a selectively enabled conduction path operatively connected in the first intermittent loading circuit path between the first and second supply rails and a control input that is responsive to the peak detector to selectively enable the switching element's conduction path when power detected across the first and second AC mains input lines is dimmed to below a predetermined level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.