Abstract
This paper introduces a DC–DC buck converter on the secondary side of the capacitive power transfer system to reduce the voltage and electric field across the interface, and to reduce the circuit Q, and thus the system sensitivity. The system is mathematically analyzed to study the improvement in sensitivity and voltage stress. The leakage electric field emissions around the plates are investigated by simulation. The analytical and simulation results show that by reducing the duty cycle of the buck converter at a constant output power, the voltage across the plates can be significantly reduced and the circuit becomes less sensitive to the variations in parameters. Experimental results demonstrated that Q and the voltage stress over the capacitive interface are reduced by changing the duty cycle of the buck converter. For delivering 10 W of power, the maximum voltage stress across one pair of the coupling plates is reduced from 211 V in the conventional system without using a DC–DC converter, to 65 V and 44 V at duty cycles of 30% and 20%, respectively. The system achieves an end-to-end power efficiency of 80% at an output power of 10 W and a duty cycle of 30%.
Highlights
Since the 1890s, efforts have focused on the wireless transfer of power [1], and the most successful approach has been inductive power transfer (IPT), which is based on magnetic field coupling
Tuning the operating frequency [25] is an effective method to mitigate the sensitivity issue and even with a highoperating frequency is an effective method to mitigate the sensitivity issue and even with quality factor, the system can still transfer the power with high efficiency, but by changing thea high-quality factor, the system can still transferchallenging the power with efficiency, but by changing the frequency, following the regulations becomes and high the design is complex, costly, and frequency, following the regulations becomes challenging and the design is complex, costly, and cannot cannot avoid the high voltage stress
The capacitive coupling interface was made of copper boards and the metal faces are covered by the tape as a dielectric material
Summary
Since the 1890s, efforts have focused on the wireless transfer of power [1], and the most successful approach has been inductive power transfer (IPT), which is based on magnetic field coupling. 150 mm to 300 mm air gap is usually considered for EV charging applications [21] This results in a factor and voltage across the capacitive interface. Was proposed to overcome the sensitivity issue [24]; the systemactive is complicated the voltage stress across the coupling interface is high. Is an effective method to mitigate the sensitivity issue and even with quality factor, the system can still transfer the power with high efficiency, but by changing thea high-quality factor, the system can still transferchallenging the power with efficiency, but by changing the frequency, following the regulations becomes and high the design is complex, costly, and frequency, following the regulations becomes challenging and the design is complex, costly, and cannot cannot avoid the high voltage stress. A CPT withsensitivity a DC–DCand buck on theacross secondary side is introduced to simultaneously reduce system the system theconverter voltage stress the capacitive interface.
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