Study on Constant Charging Current Charging Control of Contaceless Power Ttransfer Systems

Aimed at the charging control of contactless power transfer (CPT) systems, the paper proposes a primary side control method based on H∞ control. With the conversion of differential dynamic model in frequency domain, the generalized state space averaging model is set up. The control system structure and performance weighted function are proposed. The Ricatti equations for controller and observer are put forward and solved with Hermitian matrix as well. Furthermore, an iterative computing method is designed to acquire optimal H∞ controller. The control method can regulate the energy injection according to different load condition and improves the system efficiency especially for light load condition. The experimental results verify this method.