Abstract
Loosely coupled inductive power transfer system is designed to deliver power efficiently from a stationary primary source to one movable secondary load over relatively large air gap via magnetic coupling without wires and connectors. It has advantages of avoiding the dangers of sparking and the risk of electrical shocks. However, the research and development about this technology is quite limited at present in this country. Considering its potential development and applications in the future, it is vary worthy to study and explore the fundamental principle and design guideline of a noncontact switching mode DC power supply. The contributions of this thesis may be summarized as follows. First, three resonant frequencies, namely, and are obtained which can achieve minimum input volt-ampere capacity of the loosely coupled inductive power transfer system as well as maximum output power. Second, in order to analyze and design this system more efficiently, by assuming that the series resonant frequency is equal to the parallel resonant frequency, simple analytic formulas of and are obtained. Third, according to characteristics of different operation modes in AC output situation, output voltage or current can be controlled from the primary side of the transformer. Fourth, a simple design procedure and some analytic formulas are proposed to simplify the design process. Finally, a prototype is also constructed to verify the feasibility of the proposed theory.