Design High Power Factor High Efficiency Primary-Side Regulated Flyback LED Driver

Inhalt:
This article explains the operation principles of the Primary-Side Regulated (PSR) Flyback topology in LED lighting application with high power factor and high operation efficiency. The basics of the PSR Flyback LED driver are presented and its merits are addressed. A design procedure is proposed and described in details for engineers to achieve the optimum design balance between the AC/DC LED driver’s efficiency, Power Factor (PF), THD and its Flyback transformer design. The unique PSR Flyback design approach allows the driver operate partially in BCM mode at low input voltage. Therefore the driver can achieve high efficiency, maintain high Power Factor and low THD. A quick design example is also given at the end of the paper for verification.