Large signal dynamic stability analysis of synchronised current controlled modulators. Application to sine wave high power inverters

Abstract

This paper deals with a new application of DC/DC regulators for the achievement of a sine wave output. More particularly, synchronised current control modulator MC <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> in a buck configuration is discribed to generate an AC waveform at 50 Hz. Large signal simulation is detailed which concludes on the setting of a sawtooth corrective network to avoid the structural instability for V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> >> V/2. It is shown that small signal analysis can be applied for such application and mathematical models for discontinuous and continuous conduction modes are presented. The paper ends with the test of a breadboard generating a pure sine wave without harmonic content at 85 % efficiency.