The Analysis And Design Of The Parallel Resonant ICPT System

The inductively coupled power transfer technology (ICPT) provides a new way to deliver power. In recent years, many successes have been achieved. The prospect of ICPT is so broad that more attention is paid to it. By now, many practical applications of ICPT have been actualized.ICPT is used in non-contact power transmission system. Generally, ICPT is made up of two sub-circuits: high frequency power radiation circuit composed of switch converter and resonance circuit which accept and provide power to the load. The coupling between the radiation circuit and the receive circuit is so weak that the tradition theory and technology used in transformer and inductive motor aren't available in ICPT. In order to reduce the energy loss and electromagnetic stress in switch, it is important to work under the mode of zero-voltage switch (ZVS) or zero-current switch (ZCS).In this paper, a current-fed parallel resonance zero voltage converter satisfied above request is investigated. On the base of mathematical model of this kind of converter, the approximate analytic solution is obtained. The main work of this paper is presented as follow:1. First, the characteristic, development and prospect of ICPT is introduced.2. Next, the basic principle of ICPT is explained; the topology of ICPT and the types of compensative circuit are summarized and investigated.3. In the third chapter, the theory of current fed parallel resonance converter is investigated. With the saturation characteristic of MOS transistor, the dynamic mathematical model of the converter is present. The method for the period solution of strongly nonlinear systems is used to obtain the approximate analytic solution of the model. The formula of ZVC frequency is given. At last, the comparison between the numerical solution and the approximate solution is carried out with the computer.4. At the last chapter, an ICTP circuit is designed to drive a toy racing car. The results of the experiment prove that there is wide applicability of the current fed parallel resonance converter.