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

Ali Ariyan; Mohammad Rouhollah Yazdani

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

Ali Ariyan

Mohammad Rouhollah Yazdani

Vol. 17, No. 6, pp. 1445-1453, Nov. 2017

10.6113/JPE.2019.17.6.1445

Coupled inductor

Electromagnetic interference (EMI)

High step-down converter

Synchronous rectifier

Zero-voltage transition (ZVT)

Zero-current transition (ZCT)

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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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Cite this article

[IEEE Style]

A. Ariyan and M. R. Yazdani, "Zero-Voltage-Transition Buck Converter for High Step-Down DC?DC Conversion with Low EMI," Journal of Power Electronics, vol. 17, no. 6, pp. 1445-1453, 2017. DOI: 10.6113/JPE.2019.17.6.1445.

[ACM Style]

Ali Ariyan and Mohammad Rouhollah Yazdani. 2017. Zero-Voltage-Transition Buck Converter for High Step-Down DC?DC Conversion with Low EMI. Journal of Power Electronics, 17, 6, (2017), 1445-1453. DOI: 10.6113/JPE.2019.17.6.1445.