Spectral analysis of a novel transient dynamic boost PWM inverter control for power amplifiers

This paper presents a detail spectral analysis and the experimental results of a new topology to solve the distortion due to pulse dropping. Owing to the non-ideal switching characteristics of the components, pulse dropping occurs since the devices cannot produce a very narrow pulse at the output of a PWM inverter. This causes spectral distortion and is especially unacceptable for digital audio amplifier application. A new topology called Transient Dynamic Boost has been developed to solve this problem. By introducing a compensation signal when the amplitude of the modulating signal reaches a critical level, the output signal will remain undistorted with an appropriate DC link voltage is applied. Both the theoretical analysis and experimental results have verified the validity of the new technique.