Abstract
Power converters powered by batteries have been widely used in many applications, such as outdoor emergency lighting, electric motorcycle charger, unmanned aerial vehicle supply and so on. This paper presents a 500 kHz zero-voltage-switching (ZVS) Class E type DC-DC converter with two anti-series MOSFETs used for battery-powered applications. The low-side MOSFET is adopted as the main switch to realize the working operation of traditional Class E resonant converter, while the high-side anti-series MOSFET is used to implement the regulation of the converter output voltage based on pulse width modulation (PWM). Both active switches are ZVS operated so that a high efficiency can be achieved. By changing the high-side MOSFET duty cycle, the ac voltage of the resonant tank is also changed to regulate the output voltage consequently. The control method is simple, and the operating frequency is constant, which is beneficial for the design of the resonant components. A 100-W prototype is built to verify the validity of the proposed control method for which a 94.85% efficiency has been achieved.
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