Design of a High Voltage Power Amplifier with Multiple Protection

General signal generators have a low voltage output and a weak load capacity,unable to drive large capacitive loads with transducer.For these reasons,a kind of high voltage power amplifier based on MCU and PA84 is designed.This kind of amplifier can provide high amplitude,strong ability of current driving pulse.The amplifier uses the A/D combined in MCU and a self-built high-speed instrumentation amplifier to sample the output current continuously.The output short circuit and over-current protection are achieved.The use of auto zero point adjustment circuit effectively reduces the amplifier zero drift.The amplifier has output capacity up to± 140 V,maximum continuous operating current of 1 A,and has a complete overload protection and power protection.The experimental results indicate that the amplifier has a good linearity and stability.Therefore,this kind of amplifier meets the needs of practical application.