Capacitorless led driver

 · In this paper, a configuration of flicker-free electrolytic capacitor-less single-phase ac-dc driver for LED lighting is proposed. The configuration comprises an electrolytic capacitor-less PFC converter and a bidirectional converter, which serves to absorb the ac component of the pulsating current of the PFC converter, leaving only a dc component to drive Cited by: An Electrolytic Capacitor-Less LED Driver using Harmonics Injection Technique Krunal H. Patel1 Dhiren A. Luhar2 Prof. Chetan D. Upadhyay3 1,2M.E. Student 3Assistant Professor 1,2,3L.D. College of Engineering, Ahmedabad Abstract—An LED lighting system requires a driver for to the power conversion from ac voltage to dc regulated current output. current through LED lamps and achieves a high power factor and high efficiency. A W (V/A) LED driver prototype was built which demonstrates that the proposed method can achieve the same LED current with only 44µF film capacitors, compared to the µF electrolytic capacitors required in conventional single-stage LED drivers. Meanwhile.

A prototype of proposed electrolytic capacitor-less LED driver is built and practical results are validated with simulation counterparts. The proposed LED driver is able to absorb the current ripple of twice line frequency, allowing ripple free current to the load without using electrolytic capacitors. The LED drivers without electrolytic capacitors are also developed with two-stage asymmetrical half-bridge (AHB) based converters [31]-[33]. Table II shows a comparison of LED driver circuits for N groups of selective dimming. The driver is composed of two converters that are connected in parallel, using just one controlled switch. The buck–boost duty is to deliver constant power to the LED, while ensuring a good PF. The boost converter is employed to cancel the low-frequency ripple at the LED.

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