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.
Highlights
Wireless power transfer (WPT) technology, as a technology for transmitting power over a large air gap, has attracted the attention of power electronics academia in recent years
A high–frequency current whose amplitude envelope changes regularly in half–waves is modulated in the transmitting coil to realize the wireless transmission of electric energy; this transmission mode eliminates the defects caused by the direct current (DC) filtering and voltage regulation links in the traditional alternating current (AC)–DC–AC high–frequency converter, and reduces the difficulty of controlling the sinusoidal voltage output by the secondary2 loof o16p
A kind of new AC–DC–AC high frequency convertor based on series resonance is pinrohpaolfAs–eCwdaivneA[s1C4i/Ds].CmAohdiuglhaP–tFefCdreqinutehneDcCytr/AcaCunrsrmenitttCiwonmPrghpimeoncassorayteiiolnatmo preliatluiTzdxeeCteohinlevweliorepleescshtarnagnessmriesgsuiolnarolyf electric energy; this transmission mode eliminates the defects caused by the DC filtering and voltage regulation links in the tradiPtiroimnaaryl sAidCe –DC–AC high–frequency converter, and reduces the difficulty of controlling the sinusoidal voltage output by the secondary loop
Summary
Wireless power transfer (WPT) technology, as a technology for transmitting power over a large air gap, has attracted the attention of power electronics academia in recent years. A high–frequency current whose amplitude envelope changes regularly in half–waves is modulated in the transmitting coil to realize the wireless transmission of electric energy; this transmission mode eliminates the defects caused by the DC filtering and voltage regulation links in the traditional AC–DC–AC high–frequency converter, and reduces the difficulty of controlling the sinusoidal voltage output by the secondary loof o16p. A kind of new AC–DC–AC high frequency convertor based on series resonance is pinrohpaolfAs–eCwdaivneA[s1C4i/Ds].CmAohdiuglhaP–tFefCdreqinutehneDcCytr/AcaCunrsrmenitttCiwonmPrghpimeoncassorayteiiolnatmo preliatluiTzdxeeCteohinlevweliorepleescshtarnagnessmriesgsuiolnarolyf electric energy; this transmission mode eliminates the defects caused by the DC filtering and voltage regulation links in the tradiPtiroimnaaryl sAidCe –DC–AC high–frequency converter, and reduces the difficulty of controlling the sinusoidal voltage output by the secondary loop. The secondary resonant current iLs reverses to zero, and the diode current i6 and i7 continue to gradually decrease in the same direction; i5 and i8 increase in the positive direction. The load current IL is affected by both load RL and input Vi
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