LED driver circuit with open load detection
US9332614B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 2014 |
| Grant date | May 3, 2016 |
| Priority date | — |
| Expiry date | Sep 29, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B47/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Various examples directed to LED driver circuits capable of detecting the removal of an LED load are disclosed. In one example, the LED driver circuit may include a bleeder and load disconnect detection circuit having a bleeder circuit and a bleeder controller coupled to control the bleeder circuit. The bleeder controller may cause the bleeder circuit to draw a bleeder current that functions to supplement a load current drawn by an LED load to cause an input current of the LED driver circuit to be greater than a minimum holding current of a dimmer circuit. The bleeder controller may be further configured to detect a disconnect of the LED load based on the input current of the LED driver circuit, the bleeder control signal, and/or the bleeder current. In response to detecting a disconnect of the LED load, the bleeder controller may disable operation of the bleeder circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.