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http://dx.doi.org/10.6113/JPE.2017.17.6.1445

Zero-Voltage-Transition Buck Converter for High Step-Down DC-DC Conversion with Low EMI  

Ariyan, Ali (Department of Electrical Engineering, Isfahan (Khorasgan) Branch, Islamic Azad University)
Yazdani, Mohammad Rouhollah (Department of Electrical Engineering, Isfahan (Khorasgan) Branch, Islamic Azad University)
Publication Information
Journal of Power Electronics / v.17, no.6, 2017 , pp. 1445-1453 More about this Journal
Abstract
In this study, a new zero-voltage transition (ZVT) buck converter with coupled inductor using a synchronous rectifier and a lossless clamp circuit is proposed. The regular buck converter with tapped inductor has extended duty cycle for high step-down applications. However, the leakage inductance of the coupled inductor produced considerable voltage spikes across the switch. A lossless clamp circuit is used in the proposed converter to overcome this problem. The freewheeling diode was replaced with a synchronous rectifier to reduce conduction losses in the proposed converter. ZVT conditions at turn-on and turn-off instants were provided for the main switch. The synchronous rectifier switch turned on under zero-voltage switching, and the auxiliary switch turn-on and turn-off were under zero-current condition. Experimental results of a 100 W-100 kHz prototype are provided to justify the validity of the theoretical analysis. Moreover, the conducted electromagnetic interference of the proposed converter is measured and compared with its hard-switching counterpart.
Keywords
Coupled inductor; Electromagnetic interference (EMI); High step-down converter; Synchronous rectifier; Zero-voltage transition (ZVT); Zero-current transition (ZCT);
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Times Cited By KSCI : 5  (Citation Analysis)
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