Title :
Tapped-inductor buck converter for high-step-down DC-DC conversion
Author :
Yao, Kaiwei ; Ye, Mao ; Xu, Ming ; Lee, Fred C.
Author_Institution :
Monolithic Power Syst., Los Gatos, CA, USA
fDate :
7/1/2005 12:00:00 AM
Abstract :
The narrow duty cycle in the buck converter limits its application for high-step-down dc-dc conversion. With a simple structure, the tapped-inductor buck converter shows promise for extending the duty cycle. However, the leakage inductance causes a huge turn-off voltage spike across the top switch. Also, the gate drive for the top switch is not simple due to its floating source connection. This paper solves all these problems by modifying the tapped-inductor structure. A simple lossless clamp circuit can effectively clamp the switch turn-off voltage spike and totally recover the leakage energy. Experimental results for 12V-to-1.5V and 48V-to-6V dc-dc conversions show significant improvements in efficiency.
Keywords :
DC-DC power convertors; electrical faults; inductors; switching convertors; 12 to 1.5 V; 48 to 6 V; clamp circuit; floating source connection; gate drives; high-step-down dc-dc conversion; leakage inductance; tapped inductor buck converter; voltage spike; Buck converters; Circuit topology; Clamps; Inductance; Inductors; Low voltage; Magnetic separation; Pulse width modulation; Switches; Transformers; High-step-down dc–dc converter; lossless clamp circuit; tapped inductor;
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2005.850920
