Abstract
Capacitive wireless power transfer (CPT) is becoming a promising alternative to inductive power transfer (IPT) due to low costs and the simplicity of capacitive coupler. This paper presents a new architecture that makes CPT systems even simpler and easier to control. In the proposed scheme, a wide input voltage range is achieved by duty control while the output voltage is inherently load-independent, and this eliminates the need for an extra DC-DC converter. Our system also provides an extended zero-voltage-switching (ZVS) range to deal with both input and load variations. We carried out ZVS analysis for each MOSFET switch and based on this an optimal design was proposed. We implemented a prototype 160 W CPT system based on our design procedure, and its performance was then verified under a universal input voltage with load variations from 200- $1000~\Omega $ . A DC-DC efficiency as high as 88.2% was achieved, showing the value of the proposed topology.
Highlights
N OWADAYS, wireless power transfer is widely applied in electric vehicles, wireless sensor network, liquid crystal display (LCD), LED lighting and biomedical applications [1]
The DC voltage is converted to a high frequency (HF) AC voltage using a HF inverter
An input matching network (IMN) is required to compensate for the capacitance of the coupler to reduce the volt-ampere rating of the circuit while an output matching network (OMN) is used to boost the current
Summary
N OWADAYS, wireless power transfer is widely applied in electric vehicles, wireless sensor network, liquid crystal display (LCD), LED lighting and biomedical applications [1]. Various topologies are available for the HF inverter in CPT systems [5]–[9], the phase-shift full-bridge configuration is usually regarded as the most suitable topology because it can control both the magnitude and frequency of the primary voltage [10], [11] It requires four power switches and gate drivers, which makes the system complex and expensive. The proposed structure provides a wide ZVS range for both power switches by utilizing a parallel inductance, Lp, and operates exactly at the resonant frequency of system where inherent load regulation is provided. Before we illustrate the operation of the buck-boost half bridge topology, the following assumptions are made: 1) The clamp capacitor voltage VCc is considered constant due to a sufficiently large Cc. 2) The two switches, S1 and S2, have identical characteristics. ANALYSIS OF THE PROPOSED SYSTEM features of the proposed system are investigated
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