Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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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)
  • Received : 2017.04.05
  • Accepted : 2017.07.26
  • Published : 2017.11.20
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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.

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References

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