WANG Rui, WANG Jin hua, ZHANG Jun ming

 

(College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

 

 

Abstract: Aming at simplifying the complex and costly RGB LED lighting system which requires multiple LED drivers, an individually controllable multi outputs LED driver based on secondary side post regulation (SSPR) was proposed. The proposed LED driver was based on multi outputs flyback converter with additional secondary side MOSFETs. The time sharing multiplexing control was applied to make each output current individually controllable. The system configuration, operation principle and system development were analyzed in detail. A prototype was designed to verify the theoretical analysis. The results indicate that the proposed LED driver can output multiple individually controllable currents and get no influence from the load voltage and the transformer turns ratio.

 

Key words: flyback; secondary side post regulation (SSPR); LED driver; multiple output