Patent · US Active

Control circuit and method for LED drivers

US8471497B2 · kind B2 · utility

4Cited by

0References

13Claims

0Family size

Assignee

RICHPOWER MICROELECTRONICS CORPORATION · KY

Inventors

Chen-Jie Ruan · Shanghai, CN
Chin-Hui Wang · Chiayi, TW
Liang Mao · Shanghai, CN

Key dates

Filing date	Apr 6, 2011
Grant date	Jun 25, 2013
Priority date	—
Expiry date	Nov 18, 2031

Classification

Technology area (CPC H)Electricity
CPC primaryH05B45/375
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A control circuit and method for a LED driver accurately control the output current of the LED driver by adjusting a reference voltage or a feedback voltage according to the input voltage of the LED driver such that the output current decreases with the decrease of the input voltage. Therefore, it enhances the efficiency of the LED driver and maximizes the battery use time of a battery powered system.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.