Light emitting diode (LED) driver and associated LED driving method
US8207685B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 2010 |
| Grant date | Jun 26, 2012 |
| Priority date | — |
| Expiry date | Nov 1, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/44
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The LED driver of the present invention comprises multiple LED arrays, at least one dividing diode, a power module, a driving module, at least one switch pair and a voltage sensing module. Each LED array comprises multiple LEDs connected in series. The dividing diode is mounted between adjacent LED arrays. The power module is connected to an external power source and forms a pulsating direct current (DC) voltage. The driving module receives the pulsating DC voltage outputs a constant current to the LED arrays. The voltage sensing module closes and opens the switch pairs that changes electrical configuration of the LED arrays. The LED driving method of the present invention comprises setting multiple voltage drops and at least one reference voltage; sensing an incoming voltage to compare with the reference voltage; and changing ways of connections of LED arrays based on the reference voltage and the incoming voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.