An Improved Asymmetric Half-Bridge Converter for Switched Reluctance Motor in Low-Speed Operation with Current Regulated Mode

Sakhon Woothipatanapan; Phop Chancharoensook; Anuwat Jangwanitlert

An Improved Asymmetric Half-Bridge Converter for Switched Reluctance Motor in Low-Speed Operation with Current Regulated Mode

Sakhon Woothipatanapan

Phop Chancharoensook

Anuwat Jangwanitlert

Vol. 15, No. 6, pp. 1533-1546, Nov. 2015

10.6113/JPE.2015.15.6.1533

Asymmetric half-bridge converter

Parallel IGBT/MOSFET

Switched reluctance motor

Switching loss

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Abstract

This study presents a novel method for reducing the switching losses of an asymmetric half-bridge converter for a three-phase, 12/8 switched reluctance motor operated in low speed. In particular, this study aims to reduce the switching-off losses of chopping switches in the converter when operated in the current regulated mode (chopping mode). The proposed method uses the mixed parallel operation of IGBT (chopping switch) and MOSFET (auxiliary switch). MOSFET is precisely controlled to momentarily conduct prior to the turn-off interval of the IGBT. Consequently, the voltage across the switches is clamped to approximately zero, substantially decreasing the turn-off switching losses. The analytical expressions of power losses are extensively elaborated. Compared with the conventional asymmetric half-bridge converter, the modified converter can effectively minimize the switching losses. Therefore, the efficiency of the converter is eventually improved. Computer simulation and experimental results confirm the effectiveness of the proposed technique.

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Cite this article

[IEEE Style]

S. Woothipatanapan, P. Chancharoensook, A. Jangwanitlert, "An Improved Asymmetric Half-Bridge Converter for Switched Reluctance Motor in Low-Speed Operation with Current Regulated Mode," Journal of Power Electronics, vol. 15, no. 6, pp. 1533-1546, 2015. DOI: 10.6113/JPE.2015.15.6.1533.

[ACM Style]

Sakhon Woothipatanapan, Phop Chancharoensook, and Anuwat Jangwanitlert. 2015. An Improved Asymmetric Half-Bridge Converter for Switched Reluctance Motor in Low-Speed Operation with Current Regulated Mode. Journal of Power Electronics, 15, 6, (2015), 1533-1546. DOI: 10.6113/JPE.2015.15.6.1533.