Rotating Switching Surface Control of Series-Resonant Converter Based on a Piecewise Affine Model

In this paper, the control signal of the series-resonant converter is considered as a slope of a switching surface. The output characteristic of the converter, for an ideal case and above the resonant frequency, is achieved based on the slope of the switching surface. This output characteristic leads us to find the related slope for a specific converter gain. Nonlinear state equations of the series-resonant converter with new control input are represented in widely used class of hybrid systems that have been called piecewise affine systems. Considering the effects of the slope variations in the switching surface, a simple and efficient control law is achieved. The main advantage of the proposed method is the absence of microcontroller and frequency modulator integrated circuits in hardware implementation. This property makes the proposed method more beneficial in high-frequency applications. Experimental results confirm our theoretical investigations.