Analysis of Chaos in Three-Level Full-Bridge Converter

Abstract As an important part in the active magnetic bearing, its performance has great impact on bearing system. Most of systems use current-mode switching power amplifiers. The full-bridge converter is main topological structure amplifier for bearings. It mainly supplies current to coil so it can offer enough fore rotor. abundant nonlinear phenomena as conversion device lies region. This paper chooses proportionally controlled three-level bearings under mode pulse width modulation (PWM) study object, building a discrete mapping model circuit by stroboscopic sampling and conducting analyses bifurcation stability chaotic characteristics based this built. established adjustment range proportional control coefficient carrier cycle using numerical calculation, with correctness theoretical analysis being verified simulation experimental results. Chaotic be eliminated reducing controller bus voltage, increasing frequency, which enhances converter.