Stability analysis of DC-DC converters with energy balance control

With variation of parameters, DC-DC converters may change from stable state to an unstable state, which degrades the performances of the converter system severely. In this article, by establishing the state-space average model, the stability and bifurcation of a boost and a buck-boost converter with the energy balance control (EBC) is studied, respectively. Then the stability boundary and stable parameter domains are accurately predicted. The obtained stability region provides parameter regulating range for converter design. Furthermore, compared with the one-cycle control (OCC) method, the EBC possesses an extended stable parameter domain, which avoiding the unstable behaviors such as Hopf bifurcation, Quasi-periodic Oscillation even chaos, etc. The theoretic analysis is well validated though simulation and experiment.