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In order to optimize the efficiency of Buck converter in wireless charging system for EVs and further the efficiency of whole system, the loss model is established and analyzed in this paper. The load characteristics of Buck converter in wireless charging system is analyzed and then the relationships between switching frequency and efficiency in different load characteristics are derived and switching...
Maximum power transfer is a significant issue in wireless power transfer system, the common used method is impedance matching to track the optimal impedance point by using a power electronic converter. However, in a practical WPT system, the coupling coefficient will drift from the designed value due to the air gap, receiver structure and other environmental influence. As a result, the optimal impedance...
An effective voltage regulation circuit for inductive power transfer systems was proposed in this paper. The circuit takes the advantage of the secondary coil and a switch component and a capacitor was added. The relationship between output voltage and duty cycle of switches was analyzed and verified by simulation.
This paper studies a frequency bifurcation phenomenon of a soft-switched push-pull contactless power transfer (CPT) system with parallel tuned pick-up and short-circuit decoupling power flow control. An extended stroboscopic mapping method is applied to obtain the possible zero voltage switching (ZVS) operating points first, then the fundamental resonant operating points are defined, and the system...
This paper proposes an extended stroboscopic mapping (ESM) method for analyzing soft-switching operating points of resonant inverters. The essential idea of the proposed method is treating the operating period of traditional stroboscopic mapping model as a variable and employing fixed-point theory to find the soft-switching operating points. The method consists of four simple and easy-to-implement...
The complicated nonlinear behaviors of a triacbased controllable rectifier are investigated in this paper. The triac is modeled as a nonlinear equivalent resistor. Considering the triggering and conducting conditions of the triac and the conducting condition of the rectifier, a piecewise state space model is set up. Based on that, a discrete iteration mapping model is further developed to analyze...
The paper present comparison analysis of current soft-switched methods. Series resonant full bridge topology and parallel resonant full bridge topology were choose for their sine wave current in inductor, which meet requirement of Contactless Power Transfer (CPT) system. The paper also presents a detailed simulation and analysis between series resonant and parallel resonant full bridge topologies...
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