Method and system for high efficiency, fast transient multi-channel LED driver
US8058810B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 7, 2009 |
| Grant date | Nov 15, 2011 |
| Priority date | — |
| Expiry date | May 12, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/46
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
System and method for a light emitting diode (LED) driver are disclosed. To supply an LED bus voltage to a large array of LEDs organized in multiple channels where one or more LEDs are connected in series in each channel, an LED driver includes a power converter, a feedback generation circuit, and a phase-division based controller. The power converter is configured for providing the LED bus voltage to the multiple LED channels based on a voltage control signal. The feedback generation circuit is configured for generating a feedback signal based on the LED bus voltage supplied to the multiple LED channels. The phase-division based controller is configured for generating the voltage control signal based on the feedback signal and information from the multiple LED channels. The phase-division based controller divides each pulse width modulation (PWM) of each channel into a tracking phase and a pre-charging phase so that the LED bus voltage supplied to the multiple channels changes between the tracking phase and the pre-charging phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.