Compensation circuit for improving the current transfer ratio of the photo coupler and the power control system including the circuit

摘要

PURPOSE: A compensating circuit and a voltage control system including the same are provided to stabilize phase and size of an output voltage by improving current transfer ratio of a photo-coupler creating a transfer current in response to a forward current. CONSTITUTION: A compensator(400) comprises a feedback circuit, a photo-coupler, and a current transmission ratio improvement block(410). The feedback circuit feeds back an output voltage. The photo-coupler creates a transfer current corresponding to a forward current flowing in the feedback circuit. The current transmission ratio improvement block improves current transfer ratio of the photo-coupler. The current transmission ratio improvement block comprises a capacitor connected in parallel with an optical detector(PD).