LED driver circuits
US8749163B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 22, 2011 |
| Grant date | Jun 10, 2014 |
| Priority date | — |
| Expiry date | Mar 31, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/50
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A driver circuit for one or more LEDs includes a power circuit having an output terminal, a capacitor coupled to the output terminal and a switch, and a control circuit coupled to the power circuit for controlling the power circuit. The control circuit is configured to operate the switch for coupling a resistance in series with the capacitor in response to detecting an open circuit condition at the output terminal. Additionally, or alternatively, the driver circuit may include a switched mode power supply, and the control circuit may be configured to switch operation of the switched mode power supply from a current control mode to a voltage control mode, and reduce a current setting for the current control mode, in response to detecting an open circuit condition at the output terminal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.