Abstract
Wireless power transfer (WPT) technology has been widely applied to automobile industries, household electronics and medical devices because of its many advantages. The hybrid battery charging scheme, which combines constant voltage (CV) and constant current (CC), is considered to be quite reasonable in view of the limitations of the conventional CC/CV implementation scheme. In this study, based on the inductance and double capacitances-series (LCC-S) compensation topology, a switching hybrid topology is proposed for CC/CV electric vehicle (EV) battery charging. The topology parameters are designed according to the specified CV and zero phase angle (ZPA). In the CC charging mode, two additional capacitances are added to the topology for CC and ZPA implementation. Based on the proposed weak communication, the CC and CV charging mode can be converted via two AC switches (ACSs). The proposed hybrid system provides a simple structure, easy controllability, and stable output. A 2.5-kW experimental prototype is configured to verify the proposed hybrid charger. The maximum DC efficiencies (at 2.5-kW) of the CC and CV charging modes are 89.28% and 88.33%, respectively.
Highlights
Electric vehicle (EV) battery charging methods involve both contact charging and wireless charging [1]–[3]
Two additional capacitors are added to an LCC-S topology and controlled via two AC switches (ACSs) for constant current (CC) and constant voltage (CV) charging
The CC, CV and zero phase angle (ZPA) characteristics could be implemented with ease using the proposed topology
Summary
Electric vehicle (EV) battery charging methods involve both contact charging and wireless charging [1]–[3]. Y. Chen et al.: Switching Hybrid LCC-S Compensation Topology for Constant Current/Voltage EV Wireless Charging. In practical WPT applications, conventional control methods, e.g., FM control, PS control, and zero phase angle (ZPA) automatic tracking control usually require high-speed and real-time feedback of information (battery voltage/current, state of charge (SOC), etc.) from the receiver to the transmitter via wireless communication (Zigbee, Wi-Fi, Bluetooth, etc.) [24], [25]. In the WPT system based on the switching hybrid topology, a concept of weak communication is proposed here, because the CC/CV charging can be implemented without continuous feedback from the secondary to the primary side. In the LCC-S resonant network shown, C1 and C2 are two additional capacitors to implement CC/CV output, and S1 and S2 are the corresponding ACSs to switch the charging modes.
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