A PWM ASIC using stochastic coding

Abstract

The authors describe an application-specific integrated circuit (ASIC) design implementing a novel pulse width modulation (PWM) technique. This PWM function is based on the stochastic coding of the driving pulses. This approach allows a small IC area and high-speed generation of pulse sequences. The validity of the proposed PWM has been studied with simulation and experiment. Several limiting operation conditions of the ASIC are also defined. Using the stochastic PWM a three-voltage inverter is shown to be a more efficient solution than the classical PWM and a dual-voltage inverter; fewer harmonics are generated in current and voltage.<>