LED 照明用電解コンデンサレス ディジタル制御スイッチングコンバータ

抄録

This paper presents an analysis of the current control for converters without electrolytic capacitors for light-emitting diode(LED) lamps. Although LEDs are long life, the life of drivers using the electrolytic capacitors is less than the one of LEDs. Therefore filmcapacitors are applied instead of electrolytic capacitors. However, a fluctuation of LED current increases since the capacitance is reduced.In order to avoid the flickers, the current controller must reduce the fluctuations. To analyze and simulate inductor currents of the converters, nonlinear systems are employed. Prototype converters are implemented by a micro controller. It is shown that the proposed analysis is good agreed with simulation results and experimental results.