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| The LED Current Oscillation Suppression Method of High Frequency PWM Shunt Dimming Driver |
| Wang Yifeng1, Wu Xiaochen1, Li Lei2, Liang Yan2 |
1. School of Electrical and Information Engineering Tianjin University Tianjin 300072 China;
2. Beijing Huayuan New Arts Film and Television Equipment Limited Company Beijing 100088 China |
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Abstract For meeting LED requirement of high dimming performance application such as film and television shooting, this paper proposed the LED current oscillation suppression method. The method was applied to PWM shunt three-switch-Buck topology which works in high dimming frequency and wide dimming range. Firstly, it analyzed the effect of parasitic parameters on oscillation current. Meanwhile, the paper proposed a method which connects a diode with LED in series. In such way, the parasitic oscillation of LED current is suppressed. And both the reliability of LED dimming driver and output waveform qualification are improved. Finally, a 480W prototype which drives four LED arrays which comprises 9 LEDs in parallel and 15 LEDs in series each was built to verify correctness of the proposed method. The dimming frequency and switching frequency are 20kHz and 500kHz, respectively. The experiment results not only suppress current parasitic oscillation but also achieve wide dimming range which is from 1% to 99.99%.
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Received: 21 May 2020
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2021, Vol. 36 
