Abstract
This paper proposes an LCL-L compensation circuit for high power capacitive power transfer (CPT) aiming at minimizing number of resonant components and improving system performance. The proposed topology adopts only four external resonant components at both sides of the capacitive coupler. The output power is proportional to the capacitive coupling coefficient, therefore, it simplifies the design procedure and abolishes protection circuit requirements under coupler’s misalignment. Moreover, optimizing efficiency at full-load conditions of compensation network can be easily achieved in this system by designing resonant components at the highest value of the mutual capacitance. Theoretical analysis of the proposed system is conducted alongside comparison to lasted CPT compensation circuits. Simulation and experimental results of a 1.5-kW CPT prototype with an air gap distance of 150 mm are provided to verify the feasibility and the effectiveness of the proposed system. System performances under different coupler’s misalignment conditions and output power levels are also examined and discussed as well.
Highlights
As compared with an Inductive Power Transfer (IPT) system, a capacitive power transfer (CPT) system has several benefits such as implementing low-cost and insensitive to nearby metal objects [1]
This paper introduces the LCL-L compensation circuit topology for high power and large air-gap CPT systems such as Electric Vehicle battery charging to eliminate the abovementioned drawbacks associated with double-sided LC topology
An improved LCL-L compensation circuit topology for a high-power CPT system is presented in this paper
Summary
As compared with an Inductive Power Transfer (IPT) system, a capacitive power transfer (CPT) system has several benefits such as implementing low-cost and insensitive to nearby metal objects [1]. To further reduce the number of components, double-sided LC topology [23], [24] is proposed by developing from a series compensation circuit where only an external inductor and capacitor are connected in series and parallel with the capacitive coupler in each side respectively In both [21] and [22], the output power is proportional to the capacitive coupling coefficient k, which brings several advantages. This paper introduces the LCL-L compensation circuit topology (i.e. illustrated in Fig. 2) for high power and large air-gap CPT systems such as Electric Vehicle battery charging to eliminate the abovementioned drawbacks associated with double-sided LC topology. In the following analysis Vin, V1, V2, Vo, Iin, I1, and Io are used to express the complex form of the corresponding variables
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