LED driver circuit and method
US6836081B2 · kind B2 · utility
124Cited by
8References
37Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Oct 31, 2001 |
| Grant date | Dec 28, 2004 |
| Priority date | — |
| Expiry date | Jun 12, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/58
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An LED driver circuit and method are disclosed where a plurality of arrays of light emitting diodes each have a transistor connected to each respective array of light emitting diodes. A PWM controller has an input for receiving a voltage reference and an output connected to selected transistors for driving the selected transistors and setting a PWM duty cycle for the selected arrays of light emitting diodes to determine the brightness of selected light emitting diodes. An oscillator is connected to the PWM controller for driving the PWM controller.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.