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A high-power-LED driver with power-efficient LED-current sensing circuit

Wing Yan Leung, Tsz Yin Man, Mansun Chan

Open publisher page 33 citations

Abstract

For lighting application, high-power LED nowadays is driven at 350mA and a sensing resistor is used to provide feedback for LED-current regulation. This method adds an IR drop at the output branch, and limits power efficiency as LED-current is large and keeps increasing. In this paper, a power-efficient LED-current sensing circuit is proposed. The circuit does not use any sensing resistor but extracts LED-current information from the output capacitor of the driver. The sensing circuit is implemented in a Buck-boost LED driver and has been fabricated in AMS 0.35μm CMOS technology. Measurement results indicate a power-conversion efficiency of 92% and at least 90 times power reduction in sensing compared to existing approach.

About this research paper

What this paper is about

For lighting application, high-power LED nowadays is driven at 350mA and a sensing resistor is used to provide feedback for LED-current regulation. This method adds an IR drop at the output branch, and limits power efficiency as LED-current is large and keeps increasing. In this paper, a power-efficient LED-current sensing circuit is proposed. The circuit does not use any sensing resistor but extracts LED-current information from the output capacitor of the driver. The sensing circuit is implemented in a Buck-boost LED driver and has been fabricated in AMS 0.35μm CMOS technology. Measurement results indicate a power-conversion efficiency of 92% and at least 90 times power reduction in sensing compared to existing approach.

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OpenAlex reports 33 citations for this work. Citation counts describe recorded attention and do not establish research quality.

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Available abstract

For lighting application, high-power LED nowadays is driven at 350mA and a sensing resistor is used to provide feedback for LED-current regulation. This method adds an IR drop at the output branch, and limits power efficiency as LED-current is large and keeps increasing. In this paper, a power-efficient LED-current sensing circuit is proposed. The circuit does not use any sensing resistor but extracts LED-current information from the output capacitor of the driver. The sensing circuit is implemented in a Buck-boost LED driver and has been fabricated in AMS 0.35μm CMOS technology. Measurement results indicate a power-conversion efficiency of 92% and at least 90 times power reduction in sensing compared to existing approach.

Key concepts: LED circuit, Resistor, Capacitor, Electrical engineering, Power (physics), CMOS, Current (fluid), LED lamp

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