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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...
Buck-IPT system is composed of a front power regulation buck circuit and a behind inductive power transfer circuit (IPT), which is higher-order, multi-operating-mode, compound nonlinear system. Aiming at dynamic problems such as large inductor current and slow response in the start-up progress, this paper proposes a dynamic characteristic optimization control method. Firstly, this paper proposes a...
The technology of dynamic Wireless Power Transfer (WPT) has a broad application prospect in Electrical Vehicle (EV). Recently, the DD type has been proposed as the EV's charging magnetic coupler design, which already has been shown to have the best performance in the stationary charging. For dynamic wireless charging, the output power fluctuates when EV moves. This paper seeks to optimize the magnetic...
A multi-scale modeling method is proposed for analyzing wireless power transfer (WPT) systems. Utilizing hybrid system theory and mechanism modeling theory, a two-scale model is built for a WPT system with series tuned primary and secondary sides. Both the circuit-level evolution mechanism and component-level dynamic switching process can be analyzed clearly and efficiently. Simulation results have...
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.
Aiming at achieving robust control of an Inductive Power Transfer (IPT) system and based on an H∞ loop-shaping algorithm, this paper proposes a multi-objective optimization framework to ensure an optimal performance. Three objectives and constraints related to the H∞ loop-shaping design and singular structured value are defined to optimize the robust stability and robust performance. A time-domain...
In an Inductively Coupled Power Transfer (ICPT) system, there are two approaches, namely terminal control and source control, to obtain constant voltage output. The source control is beneficial to reduce unnecessary power losses and realize optimal operation. However, due to nonlinear characteristic of ICPT system, it is difficult to set up a nonlinear robust controller. This paper presents an extended...
Based on Generalized State Space Averaging (GSSA) method, this paper realized the output control of an Inductively Coupled Power Transfer (ICPT) system with frequency uncertainty. The state variables in time domain were expanded to generalized state variables in frequency domain and the linear state space model was established. Using linear fractional transformation, the GSSA model was separated into...
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...
In Inductively Coupled Power Transfer (ICPT) system, attribute to unidirectional energy transfer, there are many problems such as energy feedback difficultly and low efficiency brought by system open-loop running. This paper put forwards a novel contactless energy bi-directional transfer mode to realize energy exchange between transmitter and receiver. The paper presents a bi-directional energy conversion...
This paper presents a new power regulation method for contactless power transfer systems that combines current magnitude control of a series tuned resonant converter with energy injection concepts suitable for constant load or single pick-up applications. In the latter, the control of the primary converter operates with asymmetrical control, to regulate the magnitude of the high frequency primary...
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...
The LCL type MCWPT system in continuous current mode is analyzed in detail. The iterative model for numerical analysis of transient dynamic response is built up with discrete time mapping modeling method. It is found that when the control frequency is equal to the inherent resonant frequency of secondary side, the inverter output current has large distortion and the switches are working in hard-switching...
This paper studies boost zero-voltage-switching (ZVS) multi-resonant converter (MRC). Compared with the hard switching converter, it has many virtues such as high efficiency and low radiated EMI emission. Both the hard-switching and the soft-switching boost converters are modeled with state-space averaging method and discrete time mapping modeling method respectively. Simulation results verify the...
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