Circuit Topology Analysis for LED Lighting and its Formulation Development

William Chen, Ka Wai Eric Cheng and Jianwei Shao
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William Chen: Power Electronics Research Centre, Department of Electrical Engineering, The Hong Kong Polytechnic University, Kowloon 999077, Hong Kong, China
Ka Wai Eric Cheng: Power Electronics Research Centre, Department of Electrical Engineering, The Hong Kong Polytechnic University, Kowloon 999077, Hong Kong, China
Jianwei Shao: Power Electronics Research Centre, Department of Electrical Engineering, The Hong Kong Polytechnic University, Kowloon 999077, Hong Kong, China

Energies, 2019, vol. 12, issue 21, 1-27

Abstract: Light emitted diode (LED) is becoming more popular in the illumination field, and the design of LED lighting is generally made to provide illumination at lower power usage, helping save energy. A power electronic converter is needed to provide the power conversion for these LEDs to meet high efficiency, reduce components, and have low voltage ripple magnitude. The power supply for LED is revisited in this paper. The LEDs connected in series with diode, transistor, or inductor paths are examined. The formulation for each of the cases is described, including the classical converters of buck, boost, buck–boost, and ?uk. The circuit reductions of the classic circuit, circuit without the capacitor, and without a freewheeling diode are studied. Using LED to replace freewheeling diodes is proposed for circuit component reduction. General equations for different connection paths have been developed. The efficiency and output ripple amplitude of the proposed power converters are investigated. Analytical study shows that the efficiency of proposed circuits can be high and voltage ripple magnitude of proposed circuits can be low. The results show that the proposed circuit topologies can be easily adapted to design LED lighting, which can meet the criteria of high efficiency, minimum components, and low-voltage ripple magnitude at the same time.

Keywords: LED driving circuit; diode path; transistor path; inductor path; theoretical analysis; ripple amplitude; efficiency; component count (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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