Quasi-Z-Source Resonant Full Bridge Converter for Wireless Power Transfer with Sliding Mode Model Predictive Control

Abstract

Generally, resonant converter uses frequency modulation method for load control method. Setting the Resonant frequency under varying loading conditions is always a trade-off. For wireless power transfer (WPT), the resonant tank has a high-quality factor, and frequency fluctuations affect efficiency and gain. To achieve high efficiency, lower price and complexity, quasi-Z-source isolated resonant full bridge converter is proposed. It can reliably solve the shoot-through problem which makes short circuit and reduce the ripple output voltage compared to conventional voltage source. An efficient battery load control method can reach an advanced switching method. A fast and robust WPT allows the system to be controlled according to battery power production and consumption through the sliding mode control of battery power and switch duty and phase delay. In addition, we can perform primary and secondary side model predictive control of the quasi-z-source resonant full bridge converter by optimizing the cost function using the value of reference duty and amount of a battery’s power. The experimental results show that the proposed method can robust control WPT within a load battery demand variance.