1-MHz self-driven ZVS full-bridge converter for 48-V power pod and DC/DC brick

• Published in: IEEE transactions on power electronics Vol. 20; no. 5; pp. 997 - 1006
• Main Authors: Ming Xu, Yuancheng Ren, Jinghai Zhou, Lee, F.C.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.09.2005; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Capacitors; Converters; DC/DC brick; Diodes; Direct current; Drivers; Driving; Electric currents; Electrical engineering. Electrical power engineering; Energy consumption; Energy efficiency; Exact sciences and technology; Gates; Microprocessors; Power electronics, power supplies; power pod; Power system transients; Pulse width modulation; Rectifiers; self-driven; Strontium; Switching frequency; Synchronous; Topology; Zero voltage switching; zero voltage switching (ZVS); Waveform; Rectifier; Power converter; power pod; Prototype; Computer power supplies; self-driven; Snubbers; Zero voltage switching; Power electronics; Experimental study; Energy loss; Experimental result; Network analysis; zero voltage switching (ZVS); High frequency; Computer server; Synchronous circuit; Comparative study; Bridge convertor; DC/DC brick
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2005.854019

In this paper, a self-driven zero-voltage-switching (ZVS) full-bridge converter is proposed. With the proposed self-driven scheme, the combination of the ZVS technique and Self-driven technique recycles the gate driving energy by making use of the input capacitor of the secondary side synchronous rectifier (SR) as the snubber capacitor of the primary side switches. Compared with the external driver, the proposed converter can save driving loss and synchronous rectifier body diode conduction loss. Additionally, compared with the existed level-shifted self-driven scheme for bridge-type symmetrical topologies, its gate signal is very clean and suitable for high-frequency applications. A 1-MHz, 1.2-V/70-A prototype is built to verify the analysis. Experimental results show that it can achieve 81.7% efficiency. And there is an efficiency improvement of 4.7% over conventional phase-shifted full-bridge converter with an external driver.