Zero-Voltage-Switching High-Step-Down Buck Converter With Continuous Output Current
Reza Montazerolghaem, Ehsan Adib, Javad Semiromizadeh, Patrick Wheeler
Abstract
This article proposes a high-step-down dc–dc converter with a continuous output current. In order to obtain high efficiency, the proposed converter topology ensures the zero-voltage switching of the <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">mosfet</small> s and zero-current switching of the diodes. One of the advantages of the proposed converter is the continuity of the output current and the maintenance of the soft-switching of semiconductor elements throughout a broad power range. Through the use of coupled inductors and series capacitors, the duty cycle of the converter is lengthened. As a result, the peak current of <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">mosfet</small> s is reduced. Moreover, power is transmitted to the output through both the switches, optimizing the converter loss distribution. With the bootstrap method, the switches of the converter also are controlled, eliminating the need for gate drivers with isolated power supply. A 200-W prototype converter with a 400-V input voltage and 24-V output voltage has been implemented to validate the theoretical analysis and confirm the topology's increased efficiency.