LED drive device
US9439262B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 9, 2014 |
| Grant date | Sep 6, 2016 |
| Priority date | — |
| Expiry date | Apr 9, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B47/26
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An LED drive device that drives and lights on an LED includes: a power conversion device that converts a voltage of a first power supply, and supplies the voltage to the LED; a second power supply having a voltage lower than a threshold voltage of the LED; a current generation unit that generates current using the voltage of the second power supply, and supplies generated current to an anode of the LED; and a ground-fault detection unit that determines that a ground fault does not occur at the anode of the LED when current does not flow from the current generation unit, and determines that the ground fault occurs at the anode of the LED when current flows from the current generation unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.