Circuits and methods for driving light sources
US8890440B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 19, 2013 |
| Grant date | Nov 18, 2014 |
| Priority date | — |
| Expiry date | Aug 19, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/38
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A controller for controlling power to a light source includes a first sensing pin, a second sensing pin, and a driving pin. The first sensing pin receives a first signal indicating an instant current through an energy storage element. The second sensing pin receives a second signal indicating whether the instant current decreases to a predetermined level. The driving pin provides a driving signal to a switch to control a current through the light source to a target level. The driving signal is generated based on one or more signals selected from the first signal and the second signal. The controller further includes an error amplifier for generating an error signal based on the first signal and a reference signal indicating the target level. The output of the error amplifier is coupled to a capacitor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.