Design of a New Hybrid Topology of WPT System to Achieve Load-Independent Constant-Current and Constant-Voltage Output

Masood Rehman,Perumal Nallagownden,Zuhairi Baharudin

doi:10.3390/sym12091453

Masood Rehman, Perumal Nallagownden + Show 1 more

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https://doi.org/10.3390/sym12091453

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Journal: Symmetry	Publication Date: Sep 4, 2020
Citations: 3	License type: CC BY 4.0

Affiliation: Universiti Teknologi Petronas

Abstract

The usage of the Wireless Power Transfer (WPT) technique for charging lithium-ion (Li-ion) batteries of electric vehicles (EVs) is increasing rapidly. The Li-ion battery requires constant current (CC) followed by constant-voltage (CV) supply for efficient battery charging and to enhance its lifespan. However, it is hard to obtain CC and CV outputs due to the variation of battery resistance during charging. Moreover, a zero-phase angle (ZPA) of the input source is essential to improve the power transfer capability. Therefore, this paper proposes a new hybrid compensation topology to achieve load-independent CC and CV behavior of the WPT system along with ZPA. Two symmetrical coils have been used in the proposed WPT system as transmitter (Tx) and receiver (Rx) coils. A comprehensive mathematical analysis for achieving CC and CV characteristics as well as for power losses is carried out. A new hybrid compensation is designed by combining Series–Series (SS) and Inductor–Capacitor–Capacitor/Series (LCC-S) compensation topologies along with two additional switches. The proposed compensation works on single resonance frequency, and it is simple, reliable, and easy to implement with only one compensation capacitor from the Rx side. Simulations are performed, and a prototype is fabricated to verify the mathematical analysis and simulation results. The overall result shows that the mathematical analysis and simulations comply with the experimental results. Full load efficiencies of 90.33% and 88.91% are achieved in the CC and CV modes, respectively.

Highlights

Wireless Power Transfer (WPT) technology using inductive and magnetic resonant coupling has been broadly investigated because of its variety of applications, such as charging the batteries of implantable medical devices, consumer electronic devices, unmanned aerial vehicles (UAVs), electric bicycles (EBs), and electric vehicles (EVs) [1,2]
This section comprises the operations in constant current (CC) mode and in constant voltage (CV) mode using a simulated circuit
This paper proposes a new hybrid topology to obtain load-independent CC and CV outputs

Summary

Introduction

Wireless Power Transfer (WPT) technology using inductive and magnetic resonant coupling has been broadly investigated because of its variety of applications, such as charging the batteries of implantable medical devices, consumer electronic devices, unmanned aerial vehicles (UAVs), electric bicycles (EBs), and electric vehicles (EVs) [1,2]. WPT offers certain benefits in terms of its reliability, environment friendliness, aesthetics, enduring lifespan, and lack of electrical shocks [3,4]. Supply followed by constant voltage (CV) irrespective of load fluctuations for charging the battery is often preferred [5]. The typical charging behavior of a Li-ion battery shows that the battery voltage increases drastically during CC charging mode and arrives at certain constant levels as illustrated in Figure 1 [6]

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