Research On Theory And Technique Of Inductive Coupled Power Transfer System

This dissertation focuses on the basic working principle of Inductive Coupled Power Transfer (ICPT) system, comparing the loosely coupled transformer, which is the mainly component of the system, with the traditional transformer, building the mutual model of the loosely coupled transformer and analyzing the performance of the electromagnetic structure. In order to get a stronger magnetic field and a higher inductive voltage, a new coupling method between a rotating magnet and a receiving coil is presented according to the working principle of transformer. The influence of the size of the receiving coil to the inductive voltage and the power transfer ability is analyzed theoretically and by simulation as well. In order to reduce the influence of the leakage inductance, the influence of coupling coefficient and secondary quality factor to the voltage gain, current gain and power transfer efficiency of different compensation topology is analyzed. All the compensation circuit is simulated by PSpice software. The compensation in both primary and secondary side makes the exponent number of the system higher, which causes bifurcation phenomenon. Bifurcation criteria of all the compensation topology are presented and the frequencies at which the power switches can work at the soft-switching condition are simulated, which provide theoretical foundation for the ICPT system design in order to avoid bifurcation and reduce the switching loss.