Isolated Flyback DC-DC Chopper Mode Inverters with Feedforward-Proportional Integral-Repetitive Control

Abstract

This paper proposes an isolated flyback DC-DC chopper mode inverter with feedforward-proportional integral-repetitive control. The circuit topology, operating mode, control strategy, system stability, and controller design are fully studied. The proposed inverter is composed of two bi-directional isolated flyback DC-DC choppers with inputs connected in parallel and outputs connected in reverse series. Repetitive control accumulates the output voltage error of the past several output cycles to obtain the control value of the current cycle, so the corrected output voltage is obtained cycle by cycle. The designed and developed 1kW inverter prototype has excellent performances such as single-stage power conversion, high static output precision, fast dynamic responses, high quality of output waveforms, strong loading capacity, high conversion efficiency and high reliability, etc.