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An Electrolytic Capacitor-less Driver for High Brightness LED

Author: WangZuoZuo
Tutor: RuanXinBo
School: Nanjing University of Aeronautics and Astronautics
Course: Power Electronics and Power Drives
Keywords: Power factor correction Flyback converter Output current PAPR Harmonic current injection method Input voltage feedforward France
CLC: TN312.8
Type: Master's thesis
Year: 2009
Downloads: 263
Quote: 5
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Abstract


High-brightness light-emitting diode (Light Emitting Diode, LED) for its energy saving, environmental protection , high efficiency, long life and many other advantages , a new generation of green lighting. With high brightness LED lighting technology matures, it will be widely used in various fields and become the preferred lighting . Manufacture of high efficiency, low cost , high power factor , long life LED lighting drive power is to ensure the quality and overall performance of the key. In this paper, no electrolytic capacitors , high-brightness LED driver power supply. Electrolytic capacitor is affecting the life of critical power , the paper can be used by high brightness LED ripple current drive characteristics , proposed a non-electrolytic capacitors , high-brightness LED driver power supply. The power supply uses a flyback converter topology , it operates in discontinuous current mode , automatically power factor correction. Since secondary current transformer high PAPR , we propose adding the output filter capacitor series inductance and the ways in which the output current is close to the ideal sine square wave . In order to ensure long-term safe and reliable LED work , we propose in the input current into the amount of the low-order harmonics in order to further reduce the output current PAPR approach. Analysis of the third harmonic injection only and simultaneous injection of third and fifth harmonics , harmonic injection volume on the output current and input power factor PAPR effects derived to meet the input power factor under the premise that the output current peak to average harmonic injection than the minimum amount . On this basis , the input voltage feedforward proposed method to achieve the third and fifth harmonic injection , the method by varying the duty cycle of the power frequency variation of the output current harmonics injected never PAPR 2 is reduced to 1.38 . Based on the above theoretical analysis, we completed a prototype of 15W and experimental verification. Experimental results show that the proposed non-electrolytic capacitors , high-brightness LED driver power supply and the input current is injected into the third and fifth harmonics in order to reduce the output current PAPR is feasible .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Semiconductor technology > Semiconductor diode > Diodes: structure and performance > Light-emitting diodes
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