Research on Constant Voltage/Current Output of LCC–S Envelope Modulation Wireless Power Transfer System

Abstract

As a technology that makes power transfer more flexible, wireless power transfer (WPT) technology has become a hot research topic in recent years. However, most of the existing studies are based on a DC–DC WPT system. If applied to AC loads, the traditional system usually contains multiple energy conversion stages, which lead to a low transmission efficiency and therefore higher costs. Besides, the necessary large electrolytic capacitors make the system unreliable and bulky. The goal of this study is to design a reliable and efficient WPT system featuring constant current (CC) and constant voltage (CV) output for AC loads. In this work, an inductor–capacitor–capacitor series (LCC–S) enveloped modulation wireless power transfer (EM–WPT) system is proposed. The design of the proposed system is elaborated in this paper, including the working principle of the system’s power converters, the relationship between CC/CV output characteristics and the input current, and the control strategy of CC/CV output based on an AC–AC boost converter. Lastly, an experimental prototype is configured to verify the CC/CV characteristics. The measured overall efficiency of the system reaches 91% and the power factor of input power supply approaches 1.

Wireless Power Transmission System for Powering Rotating Parts of Automatic Machineries

“…Some authors support their conclusions using finite element analysis as reported, for example, in [21]. The literature reports numerous works [22,23] dealing with the same issue, but the emphasis is on WPT systems' driving and regulation [24][25][26][27].…”

Electromagnetic Interference in Cardiac Implantable Electronic Devices Due to Dynamic Wireless Power Systems for Electric Vehicles

“…A compensation network is used on both the GA and VA coils to achieve the resonance condition in order to improve the electrical performance. On the receiving side, the VA coil is connected to the compensation network and to a rectifier, which transforms the high-frequency voltage into direct voltage used to recharge the battery [36][37][38][39][40][41][42][43]. For the analysis of the magnetic coupling and system performances, an equivalent simplified circuit can be adopted, as shown in Figure 2.…”

Component design procedure for LCC‐S wireless power transfer systems based on genetic algorithms and sensitivity analysis

“…For instance, the Series‐Series (SS) compensation is characterized by high transmission efficiency at low coupling coefficients and operates approximately as a current source [11]. On the other hand, the LCC‐S compensation, which is receiving relevant attention lately, achieves better results at higher coupling coefficients and operates approximately as a voltage source [12]. Each topology exploits the resonance phenomenon: inductances and capacitors are tuned to resonate at a particular frequency, minimizing the reactive power and maximizing the active power transmission [13].…”