Optocoupler Feedback Voltage Regulation Circuit for SG3525 & TL494 Inverter Output using IC TL431

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Издатель Jul 6, 2026

Want to keep your inverter output perfectly stable at 220V or 230V? In this video, we break down a simple, high-performance automatic voltage regulation circuit designed for SG3525 and TL494 PWM inverters using an optocoupler isolated feedback loop and TL431 precision shunt regulator IC.

Learn how the TL431 precision shunt regulator acts as a rock solid voltage sensor across any temperature, preventing your transformer from buzzing or fluctuating. We explain the step-by-step working of the optocoupler isolation network and the BC547 switching logic that instantly narrows down the PWM duty cycle whenever the voltage goes high.

Whether you are building a custom sine wave inverter or a square wave home inverter, this isolated feedback loop will make your project professional, safe, and highly accurate!

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