LED control circuit
US7990077B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 2008 |
| Grant date | Aug 2, 2011 |
| Priority date | — |
| Expiry date | Nov 20, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A LED control circuit includes an LED array circuit and a control circuit. The LED array circuit has a plurality of parallel branches, each of which has a constant-current regulator, an LED and an FET connected together in series, wherein the constant-current regulator supplies a steady current to the corresponding LED and the FET can control the respective LED to be put out or lighted up. The control circuit includes a microprocessor and a temperature sensor. The temperature sensor is connected with the microprocessor and located near the LEDs of the LED array circuit for detecting the temperature of the LEDs and transmitting the temperature signals to the microprocessor. The microprocessor is connected with the FETs of the LED array circuit for controlling the corresponding FETs to be repeatedly on or off according to the temperature signals in order to regulate the temperature of the corresponding LEDs respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.