The Study On Precision Testing Instrument Base On Pulsewidth Modulation Principle

This paper brings forward the modulation method based on DSP technique firstly. With the aid of high-speed powerful control DSP, the direct conformation between mathematics models and control signal is realized, and proved the anti-jamming ability, developed output stability. After compares and analyzes the different schemes of chopper circuit and relevant circuits, brings forward the scheme of chopper circuit suitable for precision testing instrument, and takes ways to improve chopper circuit. Realized the power output of DC~. AC. The emulation and tests show that the power amplifier based on PWM principle is suited with the tendency of development of precision testing instrument.