Abstract
Wireless Power Transfer (WPT) is commonly used to transmit power from a transmitting coil to various movable power devices. In the WPT system, due to a resonant tank inherent characteristic, the system cannot achieve a high output voltage gain. This paper proposes a novel current-fed push–pull circuit to realize high output voltage gain by adding a bi-directional switch between the resonant network and inverter. To obtain a high voltage gain, this paper proposes energy storage and energy injection mode to realize an energy boost function. A duty cycle control method for mode switching is also proposed. The proposed method allows the converter to operate with a variable voltage gain over a wide range with high efficiency. Experimental validation shows that the system gain of a proposed circuit can achieve a variable gain from 2 to 7 of which the converter can be two times higher than the classical system with the same condition.
Highlights
The Wireless Power Transfer (WPT) system as a novel technology can realize power wireless transmission from power supply to electrical equipment with the aid of magnetic coupling
More and more applications in WPT technology require low DC voltage input and high voltage output. These applications include the Photovoltaic (PV) system, battery power supply system and Universal Serial Bus (USB) powered devices. It is not easy for the WPT system to obtain high voltage gain according to the following reasons—first, due to the WPT system being a weakly coupling system with very low coupling coefficient k [7,8] and the coupling coefficient of transformer can almost reach 1
The second reason is the inherent characteristic of the resonant network
Summary
The Wireless Power Transfer (WPT) system as a novel technology can realize power wireless transmission from power supply to electrical equipment with the aid of magnetic coupling. Series resonant network exhibits voltage source characteristics that cannot obtain a high voltage gain. The parallel resonant network exhibits current source characteristics that obtain high voltage gain on the light load condition. An energy storage and injection switching mode is proposed to modethe is proposed to control flowing into the resonant network. A switching duty cycle regulation method regulation method is proposed to reach high voltage gain. Aiming at voltage gain promotion, this paper proposes a resonant energy promotion method at at voltage gainenergy promotion, thismode paperisproposes energy method theAiming primary side. During one full switching cycle, operation control the of connection between resonant tank and push–pull. During one fullthe switching control the operation connection between resonant tank and can push–pull circuit.
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