Design of Single Phase AC Compensated Stabilizer Power Supply Based on Chopper

The volume,precision and weight of an AC stabilized voltage supply are of vital importance to some equip-ments,but the low-power single phase AC stabilized voltage supply provided in present market generally has short-comings of high precision with big volume or small volume with low precision.So an unipolar AC stabilized voltage supply with chopping control cascade compensation is designed.In this supply,chopping control AC voltage regulat-ing,cascade compensation and a voltage closed-loop are adopted.And in the system,MCU of STC12C5A62AD with A/D input and PWM output is adopted,by which simple structure and control are gotten.DC voltage sampling feed-back technique is used in voltage closed-loop,and its sampling frequency is up to 12.8 kHz,so the precision of sam-pling and control are all high.PWM chopping frequency is 4 kHz,so capacity of filter capacitor and inductors are small.Experiment results of prototype show that the system has high precision of output voltage,and smaller volume and weight than common products,and it will have great practical value.