A PEAK CURRENT MODE CONTROLLED SEPIC LED DRIVER DESIGN CONSIDERING POWER FACTOR AND FLICKER

Year 2022, Volume: 23 Issue: 1, 109 - 125, 30.03.2022

Kerim Örüklü Deniz Yıldırım

https://doi.org/10.18038/estubtda.978478

Abstract

In this paper, a peak current mode controlled single ended primary inductor converter (SEPIC) LED driver is proposed to control the brightness of the LED. One string of 37 series connected LEDs is adopted as output of the circuit. The proposed control strategy is based on measuring MOSFET peak current value using a shunt resistor. When this voltage reaches peak threshold value, controller turns off MOSFET. The output current is adjusted to desired levels by changing this peak threshold value. The power factor in the AC power supply side is low because of the full wave bridge rectifier with capacitor filter at the input of the converter. The proposed control strategy is applied with power factor correction (PFC) circuit where input voltage is multiplied by control voltage to achieve high power factor. In PFC circuit, although the line current waveform is slightly distorted due to voltage limitations in integrated circuit (IC) chip used for the proposed control strategy, power factor is kept above 0.9 for operation region between 100mA-300mA. In addition, flicker on LED string is measured for operating current region and flicker limits are revealed. Adjustable output current levels, low flicker on LED string, MOSFET peak current control at each cycle, fast output dynamics, and high power factor are acquired by the proposed control strategy.

Keywords

Light emitting diode, Peak current mode control, Flicker, Power factor correction circuit, Single ended primary inductor converter

GÜÇ FAKTÖRÜ VE FLICKERI DİKKATE ALAN BİR TEPE AKIM MODU KONTROLLÜ SEPİC LED SÜRÜCÜ TASARIMI

Abstract

Bu çalışmada, LED’in parlaklığını denetleyebilmek için tepe akım modu kontrollü SEPİC LED sürücü devresi önerilmiştir. Devrenin çıkışı, tek dizi 37 seri bağlanmış LED’den oluşmaktadır. Önerilen kontrol stratejisi, bir direnç kullanarak MOSFET’in tepe akımını ölçmeye dayanmaktadır. Bu akım değeri, tepe eşik değerine ulaştığında, kontrolcü MOSFET’i kapatmaktadır. Tepe eşik değeri değiştirilerek, çıkış akımı istenilen seviyelere ayarlanmaktadır. Devrenin giriş kısmındaki tam dalga köprü doğrultucu ve kondansatör sebebiyle AC güç kaynağı tarafında güç faktörü düşüktür. Önerilen kontrol stratejisi, yüksek güç faktörü elde etmek için kontrol gerilimi ile giriş geriliminin çarpıldığı güç faktörü düzelten devreye uygulanmıştır. Güç faktörü düzelten devrede, önerilen kontrol stratejisinde kullanılan entegre devresindeki gerilim kısıtlamaları nedeniyle giriş akımı kısmen bozulmasına rağmen, 100mA-300mA arasındaki çalışma bölgesinde güç faktörü 0.9 üzerinde tutulmuştur. Buna ek olarak, çalışma akımları için LED dizisindeki flicker ölçülmüş ve flicker limitleri ortaya konulmuştur. Önerilen kontrol stratejisi ile her periyot için MOSFET tepe akımı kontrolü sağlanmış ve ayarlanabilir çıkış akımı, hızlı çıkış dinamikleri, yüksek güç faktörü, LED dizisinde düşük flicker elde edilmiştir.

Keywords

Işık Yayan Diyot, Tepe Akım Modu Kontrolü, Güç Faktörü Düzeltici Devre, SEPİC, Flicker

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