基于开关控制电容的电动汽车无线充电双向IPT系统设计与分析

Tahir Hafeez, M. Numan, Akif Zia, H. A. Qureshi, Hasaan Farooq
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引用次数: 0

摘要

对于松散耦合的变压器,在感应电力传输(IPT)系统中,由于变压器绕组一次侧和二次侧位置的变化,漏电电感和磁化电感会发生变化。为了减少这些电感变化的影响,已经提出了各种补偿网络。这些补偿网络用于电力电子应用中获得统一的功率因数和恒定的输出电压。然而,这些补偿网络大多只针对特定的耦合系数设计固定的补偿网络。因此,需要实现一个可变分量的补偿网络来补偿网络电感的变化。本文提出了一种基于开关电容的补偿网络,使网络的谐振频率与变换器的开关频率相匹配。该网络利用开关电容对耦合系数在0.23 ~ 0.35范围内的磁化电感进行补偿。此外,所提出的变换器是对称的,因此在零电压开关条件下,可以在保持恒定输出电压和单位功率因数的情况下实现双向潮流。
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A Study on the Design and Analysis of a Bidirectional IPT System for EV wireless charging by Using Switch-Controlled Capacitor
For loosely coupled transformers, the leakage and magnetizing inductances vary due to the changing positions for the primary and the secondary sides of the transformer windings in inductive power transfer (IPT) systems. For reducing the effects of these varying inductances, various compensation networks have been proposed. These compensation networks are used to obtain a unity power factor and constant output voltage for power electronic applications. However, most of these compensation networks have a fixed compensation network designed for only a specific coupling coefficient. Therefore, a compensation network with variable components needs to be implemented to compensate for the changing inductances of the network. In this paper switched capacitor-based compensation network is proposed to match the resonant frequency of the network with the switching frequency of the converter. The proposed network compensates the magnetizing inductance for coupling coefficient in the range of 0.23 to 0,35 using a switched capacitor. Moreover, the proposed converter is symmetrical so that bidirectional power flow is possible while maintaining constant output voltage and unity power factor under zero voltage switching condition (ZVS).
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