the robust control of pwm power amplifier by theIECON'01: The 27th Annual Conference of the IEEE Industrial Electronics Society The Robust Control of PWM Power Amplier by the Approximate 2-Degree-of-Freedom Digital Integral-Type Control System Kohji HIGUCHI, Kazushi NAKANO Kuniya ARAKI, Fumiho CHINO Dept.of Electronic Engineering Dept.of Electronic Engineering The University of Electro-Communications NF ELECTRONIC INSTRUMENTS 1-5-1 Chofu-gao-ka,Chofu 6-3-20 Tunashimahigashi,Kohoku-ku Tokyo 182-8585,Japan Yokohama 223-8508,Japan e-mai:higuchi@ee.uec.ac.jp e-mail:arakik@nfcorp.co.jp e-mail:nakano@ee.uec.ac.jp e-mail:chino-f@nfcorp.co.jp Abstract A robust PWM power amplier whose transient response characteristics do not deteriorate against an extensive load change and/or direct-current power-supply voltage change is needed. In this paper,……