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. INDEX TERMS Wireless power transfer (WPT), electric vehicle (EV), switching hybrid topology, inductance and double capacitances-series (LCC-S), constant current/constant voltage (CC/CV).
In low power energy storage systems, to match the voltage levels of the low-voltage battery side and high-voltage direct current (DC) bus, a high voltage gain converter with bidirectional operation is required. In this system, the cost effectiveness of the design is a critical factor; therefore, the system should be designed using a small number of components. This paper proposes a set of bidirectional converters with high voltage gain range based on the integration of the boost converter with a Ćuk converter, single ended primary inductor converter (Sepic), and buck-boost converter. The proposed converters consist of a small number of components with a high voltage gain ratio. Detailed comparisons are made with respect to the operating mode, number of components, voltage, and current ripple and efficiency. The efficiency of proposed converters are higher than the conventional converters in entire power range, and 6% higher efficiency can be achieved in large duty cycle by calculating loss analysis. To verify performances of the proposed converters, three 200-W prototypes of the converters are developed under the same experimental conditions. The results revealed that converter I exhibits the highest efficiency in the boost mode (92%) and buck mode (92.2%). The experimental results are shown to verify the feasibility and performances of the set of converters.
In inductive power transfer (IPT) systems, series–series (S-S) and double capacitances and inductances–series (LCCL-S) compensation topologies are widely utilized. In this study, the basic characteristics of S-S and LCCL-S are analyzed and compared in the tuning state. In addition, considering the universality of detuning, and because the two topologies have the same secondary structures, the voltage and current stress on components, input impedances, voltage gains, and output powers of S-S and LCCL-S are mainly analyzed and compared in the detuning state, which is caused by variations in the secondary compensation capacitance. To compare the efficiency of the two topologies and verify the comparative analysis, comparative experiments based on a 2.4-kW IPT experimental prototype are conducted. The comparative result shows that the S-S compensation topology is more sensitive to load variations and less sensitive to secondary compensation capacitance variations than LCCL-S. Both in the tuning and detuning states, the efficiency of the S-S topology is higher in high-power electric vehicle (EV) applications, and the efficiency of LCCL-S is higher in low-power.
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