Controlling LED current from a constant voltage source
US9769894B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 2014 |
| Grant date | Sep 19, 2017 |
| Priority date | — |
| Expiry date | Jun 27, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/3725
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An LED driver circuit provides dimming control in LED lighting applications that can accommodate an AC/DC constant voltage converter. The driver circuit provides a dimming control signal that is used to directly control the DC output current of a downstream DC/DC converter driving an LED array. The dimming control signal tracks the AC or DC output from a dimming controller such that variations in the AC or DC voltage are reflected in the dimming control signal. This dimming control signal is then provided to the downstream DC/DC converter, bypassing the AC/DC constant voltage converter to directly control dimming of the LED array. Such an arrangement lets lighting design engineers deploy the familiar and well-understood constant voltage converter topology in LED lighting applications while retaining the ability to control dimming in the LED lighting applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.