Robust Digital Control of a Broadband PWM Power Amplifier

摘要

Lately, it is required that the bandwidth of PWM (pulse width modulation) power amplifier is extended. For example, it is in application of the testing power supply of a low frequency immunity examination, or a class-D amplifier. In this paper, the authors show that the bandwidth of PWM power amplifier can be extended by using an approximate 2DOF (2-degree-of-freedom) digital controller. This controller is implemented on a DSP (digital signal processor). It is demonstrated from experiments that the bandwidth can be made wider with this controller.