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2015•IEEE Transactions on Power ElectronicsRequires access

A Novel LED Driver With Flicker-free Based on Flyback Converter

L Chen

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Abstract

In the field of light emitting diode(LED) applications,a kind of Flyback-Buck power supply is proposed in order to solve the power frequency flicker problem in AC/DC power supply with power factor correction(PFC).It consists of a Buck converter and a Flyback PFC converter with dual output windings.Auxiliary winding of the Flyback is connected with the input of the Buck structure,while Flyback PFC output in series of the Buck output constitutes the total output.By adjusting the output of Buck converter,a zero second-order line frequency output voltage ripple is reached,thus eliminates the flicker problem of LED.Due to the main power of Flyback-Buck converter deals with one time by single Flyback PFC converter,the new LED driver without flicker can achieve a much higher efficiency than cascade topology converters.Finally,a 0.7 A/50 W prototype is made to verify the theory in the laboratory.

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What this paper is about

In the field of light emitting diode(LED) applications,a kind of Flyback-Buck power supply is proposed in order to solve the power frequency flicker problem in AC/DC power supply with power factor correction(PFC).It consists of a Buck converter and a Flyback PFC converter with dual output windings.Auxiliary winding of the Flyback is connected with the input of the Buck structure,while Flyback PFC output in series of the Buck output constitutes the total output.By adjusting the output of Buck converter,a zero second-order line frequency output voltage ripple is reached,thus eliminates the flicker problem of LED.Due to the main power of Flyback-Buck converter deals with one time by single Flyback PFC converter,the new LED driver without flicker can achieve a much higher efficiency than cascade topology converters.Finally,a 0.7 A/50 W prototype is made to verify the theory in the laboratory.

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Available abstract

In the field of light emitting diode(LED) applications,a kind of Flyback-Buck power supply is proposed in order to solve the power frequency flicker problem in AC/DC power supply with power factor correction(PFC).It consists of a Buck converter and a Flyback PFC converter with dual output windings.Auxiliary winding of the Flyback is connected with the input of the Buck structure,while Flyback PFC output in series of the Buck output constitutes the total output.By adjusting the output of Buck converter,a zero second-order line frequency output voltage ripple is reached,thus eliminates the flicker problem of LED.Due to the main power of Flyback-Buck converter deals with one time by single Flyback PFC converter,the new LED driver without flicker can achieve a much higher efficiency than cascade topology converters.Finally,a 0.7 A/50 W prototype is made to verify the theory in the laboratory.

Key concepts: Flyback converter, Flyback transformer, Buck converter, Flyback diode, Buck–boost converter, Electrical engineering, Control theory (sociology), Flicker

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