Abstract
This paper presents a sleeve-type capacitive power transfer (CPT) system for contactless rotary applications. Sleeve-type capacitive couplers with different coupling arrangements between primary and secondary metal sleeves are proposed in this research, which lead to different coupling characteristics with positive, zero, and negative coupling coefficients. The effect of coupling coefficient variations caused by both the power transfer distance and the ratio between the overlapping length and the height of outer sleeves is analyzed. Combining the sleeve-type coupler, the CPT system is developed with a double-sided LC-compensated network and half-bridge inverter. For the CPT systems with positive and negative coupling coefficients, parameter design methods are presented to determine system parameters to achieve zero phase angle (ZPA) condition under the same output power. Then overall system performances of the CPT systems with local maximum positive and local minimum negative coupling coefficients are analyzed and compared by simulation in MATLAB/Simulink and Maxwell. Finally, an experimental prototype is constructed, which has demonstrated a power efficiency of 85.3% at 100.8 W. Simulation and experimental results show that the CPT system with local minimum negative coupling coefficient has clear advantages in increasing transfer distance, reducing voltage on sleeves, suppressing fringing electric field, and improving power density.
Highlights
Wireless power transfer (WPT) technology mainly utilizes magnetic field or electric field to transfer electrical power wirelessly combining power electronics technology and modern control theory
WPT is recognized by the World Economic Forum (WEF) as one of the ten emerging technologies that have the greatest impact on the world and are most likely to make significant breakthroughs [6]
Focusing on wireless charging for rotating applications, this paper proposes a capacitive power transfer (CPT) system with a novel sleeve-type capacitive coupler which consists of four layers of metal sleeves and two layers of dielectric
Summary
Wireless power transfer (WPT) technology mainly utilizes magnetic field or electric field to transfer electrical power wirelessly combining power electronics technology and modern control theory. The previous column array capacitive coupler is not helpful in increasing transfer distance, and it has not been researched on the CPT system in rotary application. Focusing on wireless charging for rotating applications, this paper proposes a CPT system with a novel sleeve-type capacitive coupler which consists of four layers of metal sleeves and two layers of dielectric. By introducing the coupler possessing local minimum negative coupling coefficient and a half-bridge inverter to the CPT system, transfer distance can be increased; voltage on sleeve and coupler size are reduced; fringing electric field is better suppressed; power density of the CPT system is improved.
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