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This paper proposes a methodology of design and control, and shows the main simulation and experimental results for a LLCC Series-parallel resonant converter applied to Wireless Power Transmission (WPT) in-motion. Using Induced Power Transfer (IPT) and considering a near-field energy-transfer method (less than 20 cm), the converter is applied in a small scale electric vehicle (EV). The modeling was...
Due to the loose coupling characteristic of the wireless power transfer system, design of the compensation topology is important. In SS resonant compensation condition, using Buck circuit in secondary side, the output load current and the duty cycle showing approximate inverse relationship in a wide range, making traditional Buck circuit control method cannot be used. To solve this problem, this paper...
In this paper thorough analysis of Series-Parallel resonant inductive coupling (SPRIC) has been presented using two-port network theory. Characteristic of SPRIC has been derived and plotted against load variation and frequency variation in MATLAB. Concept of forced resonance and natural resonance has been discussed. Important expressions such as current transfer ratio, voltage transfer ratio, maximum...
In this paper a low cost prototype of wireless power transfer system based on air coupling is presented. The system here proposed can be useful for electric vehicle (EV) battery charging systems. It consists mainly of two copper wire coils, placed one in front of the other on the same axis. The inductor coil can easily be placed under the road surface (in a parking), while the other (the receiver...
With a development of devices for high performance, the circuit technologies have been also studied. One of main streams concerns a soft switching technology to mitigate switching stress, leading to the reduction in switching losses or electro-magnetic noise. On the other hand, as a characterized orthodox technology, the existing chopper circuit is used for the electric vehicles, etc. Such technologies...
The trend toward more electric vehicles has demanded the need for high voltage, high efficiency and long life battery systems. A complete battery system consists of the following parts: protection, management and balancing. Of the three parts, balancing is the most important concerning the life of the battery system because without the balancing system, the individual cell voltages will drift apart...
This paper describes a bidirectional DC-DC converter for a small electric vehicle. The DC-DC converter designed and tested is capable of raising the voltage from the battery pack (96 V nominal) to 600 V necessary to feed the variable frequency drive that controls the induction motor. This converter is also capable of working in the opposite direction (600 V to 96 V) in order to capture energy from...
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