An LCC-P Compensated Wireless Power Transfer System with a Constant Current Output and Reduced Receiver Size

Abstract

Wireless Power Transfer (WPT) for autonomous underwater vehicles (AUVs) has been a research focus in recent years. This paper studies the inductor-capacitor-capacitor and parallel (LCC-P) compensation topology to achieve a compact receiver for AUVs. Unlike the series-series (SS) compensation topology, the LCC-P topology retains the advantages of the double-sided LCC topology and has a more compact receiver than the double-sided LCC topology with fewer elements used on the receiver side. The analytical model of such a WPT system is established to analyze the output power and transfer efficiency. The LCC-P topology has a higher efficiency compared to the SS topology due to the smaller conduction loss of the inverter. Moreover, a method of eliminating the DC filter inductor L0 is proposed to further decrease the size and weight of the receiver. The amplitude of the withstanding voltage on the receiver compensation capacitor without L0 is approximately decreased by 40% compared to that with L0. Both cases of with and without L0 have a constant current output and the peak efficiency without L0 is about 94%, which is 1% lower than that with L0. A prototype was built and the experimental results verified the theoretical analysis.

Magnetic Field during Wireless Charging in an Electric Vehicle According to Standard SAE J2954

“…The numerical simulations were carried out by a hybrid technique based on the solution of an electromagnetic (EM) field/circuit coupled problem. As a secondary goal, the mitigation of the magnetic field emissions was addressed by using an LCC compensation [25][26][27][28][29] to control the coil currents in order to be compliant with EMF safety regulations. Since the main focus was to assess the most critical magnetic field in the environment, the worst case EV-WPT system configuration was considered herein, e.g., small size vehicle (city car), high power level for the considered vehicle (WPT Class 2), maximum ground clearance, and maximum offset.…”

A Compact Spatial Free-Positioning Wireless Charging System for Consumer Electronics Using a Three-Dimensional Transmitting Coil

“…On the receiver side, C 2 and L 2 forms the series resonance. The equations of resonance relationship are given as follows [13]:…”

Influence of Asymmetric Coil Parameters on the Output Power Characteristics of Wireless Power Transfer Systems and Their Applications

“…Hence, we can conclude that when both real solutions of (8) exist, the symmetric WPT will display the frequency splitting phenomenon. At each splitting frequency the output power reaches the peak value expressed as P max = R E U 2 s /4R 2 ; otherwise, (8) has no real solution so the output power will have only one peak. According to the discriminant of (8), the critical coupling coefficient k s can be obtained:…”

“…A hefty number of related studies have appeared [1,2], making WPT technology more and more feasible. Now wireless charging is adopted for electric vehicle charging [3][4][5], power supplies for medical implanting devices [6,7], underwater devices [8], industrial drone charging [9,10], power supplies for consumer electronics [11,12], etc. All these products and services use WPT technology to improve and advance the experience feeling, making WPT applications increasingly diverse.…”