Somjai Arayawat, S. Pongswatd, P. Ukakimapurn, Thanit Trisuwannawat
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Isolated Current Feedback Control for Buck Converter
This paper proposes the design and technique for controlling DC voltage of DC-DC converter using isolated current feedback. When testing with different loads [1], the output obtained has good voltage regulator, a wide input voltage range, quick response and safe. This research uses phototransistor to detect output current signal and send feedback with isolated electrical signal to PWM (Pulse Width Modulation) circuit to control the duty cycle fed to switch. Buck converter is a step down voltage converter, which results in the current at output higher than that of input [2]. This research uses output current fed through Opto and select only linear interval current ratio fed to control and feedback. The experiment is performed using Buck-Type DC-DC converter to level the output voltage as desired.Results are satisfying and a simplest circuit.
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