Abstract
This article proposes a quasi-Z-source (qZS)-based Inductive Power Transfer (IPT) system for Electric Vehicles (EVs) charging applications. The IPT systems use the magnetic field to transfer power between two coils wirelessly, achieving improved reliability, safety and less environmental impact. Compared to the conventional IPT system, the proposed qZS-IPT system simultaneously achieves DC/DC regulation and DC/AC conversion through a single-stage conversion, thus lowering the cost and complexity of the system. Moreover, the reliability of the system is improved thanks to the qZS network shoot-though immunity and the reduced number of switches. To ensure the battery efficient charging and long service life, the constant current/constant voltage (CC/CV) method is considered. With the proposed innovative modulation scheme, the qZS can easily change between buck and boost modes, respectively, lowering or increasing the secondary side current. A theoretical analysis is presented for system design. Simulation results based on a 25 kW (200 V/135 A) low duty EV charger are presented to verify the effectiveness of the proposed scheme. Experimental tests are performed on a 150 W scale-down prototype to validate the analysis and demonstrate the effectiveness of the proposed qZS-IPT system for CC/CV chargers.
Highlights
The growing need to reduce polluting emissions leads, in our days, to the rapid spread of Electric Vehicles (EVs) [1]
It should be noted that the articles reviewed so far are all preferred for the classic Inductive Power Transfer (IPT) configuration, while there are still few works that consider the implementation of the current/constant voltage (CC/CV) charging mode on Z-source converters-based IPT systems
To achieve the CC/CV charging method, the control acts on the primary side qZS converter and with a proper modulation scheme, the converter can increase or decrease the voltage on the primary side
Summary
The growing need to reduce polluting emissions leads, in our days, to the rapid spread of Electric Vehicles (EVs) [1]. The input impedance network (Z-network) ensures short circuit protection Another key element in IPT systems is the battery charging method [31,32]. It should be noted that the articles reviewed so far are all preferred for the classic IPT configuration, while there are still few works that consider the implementation of the CC/CV charging mode on Z-source converters-based IPT systems. The main motivation of this article is to investigate impedance source converters in IPT systems for CC/CV charging of EV batteries. To achieve the CC/CV charging method, the control acts on the primary side qZS converter and with a proper modulation scheme, the converter can increase (boost mode) or decrease (buck mode) the voltage on the primary side. A small-scale prototype is presented in Section 5 and the acquired waveforms and recorded CC/CV charging curves are provided, validating the proposed system with experimental results
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