access icon free Novel distortionless dimming in high power LED lighting using isolated SEPIC converter

A new low-cost energy-saving concept in the modern light-emitting diode (LED) illumination system is developed and implemented using an isolated single-ended primary inductance converter (SEPIC). The dimming scheme presented in this study is a single-step with negligible distortion in the AC mains current as compared to the traditional low-cost triode for alternating current (TRIAC) dimming system, which distorts the AC mains current wave-shape beyond sinusoidal nature due to the phase-cut techniques. This dimming concept is completely retrofitted, no additional arrangement is required to initiate the dimming as compared to a TRIAC dimmer or other controllers. The isolated SEPIC converter is modelled and analysed in detail using the state-space average technique. The stability of the designed converter and overall closed-loop control are verified using Bode-plot analysis. The full load converter efficiency is found around 93%, which is much higher than the conventional flyback topology-based LED driver. The concept presented in this study is tested with the help of a laboratory prototype with an LED load of 60 W.

Inspec keywords: switching convertors; DC-DC power convertors; driver circuits; closed loop systems; light emitting diodes; power factor correction; power convertors; lighting

Other keywords: additional arrangement; dimming scheme; designed converter; current dimming system; negligible distortion; TRIAC; other controllers; low-cost energy-saving; LED load; novel distortionless dimming; primary inductance converter; load converter efficiency; power 60.0 W; SEPIC converter; dimming concept; AC current wave-shape; state-space average technique; AC mains; illumination system; lighting; conventional flyback topology-based LED driver; modern light-emitting diode; closed-loop control; low-cost triode; cut technique

Subjects: Power electronics, supply and supervisory circuits; Control of electric power systems; Light emitting diodes; DC-DC power convertors; Power convertors and power supplies to apparatus

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