| Abstract |
This paper discusses the use of a power inverter, controlled with a dual current mode modulator, as a high efficiency high power operational amplifier. The power converter and PWM modulator are represented by a linear continuous small signal model which is suitable to easily synthesize the feedback loops needed to obtain a four quadrant inverter, which then performs as the operational amplifier. Both maximum power and small signal bandwidths are briefly pointed out. The unsuitability of the continuous model for the stability prediction, led to a discrete model, derived from the continuous one, for the study of the onset of instability. Chaotic behaviour in this region is also illustrated. Theoretical and experimental results concerning the implementation of DC and low frequency AC power supplies, together with their internal reactance for the simulation of AC networks, are presented. |
