Iron loss evaluation of magnetic materials excited by a SiC inverter with a Schottky barrier diode wall-integrated trench MOSFET

Atsushi Yao,Fumiki Kato,Hiroshi Hozoji,Hiroshi Sato,Shinsuke Harada,Hiroshi Yamaguchi

doi:10.1063/9.0000035

Abstract

This study examines the impact of the different diode characteristics on the magnetic hysteretic and iron loss properties of a conventional non-oriented (NO) silicon steel sheet core under silicon carbide (SiC) inverter excitation. We compared the magnetic properties of the magnetic core excited by the inverter using the developed Schottky barrier diode (SBD) wall-integrated trench MOSFET (SWITCH–MOS), which has a low on-voltage Von diode, with those excited by the inverter using a conventional U-shaped trench gate MOSFET (UMOS), which has a body PiN diode with high Von. This study shows for the first time that the shape of the minor loop and iron loss properties depends strongly on only the diode characteristics in the inverter. The iron loss of magnetic materials excited by the SWITCH–MOS inverter with the low-Von diode (i.e., the built-in SBD) was less than that in the case of using the conventional UMOS with a high-Von diode (i.e., the body PiN diode). That is, the SWITCH–MOS with built-in SBD can reduce not only the switching loss, but also the iron loss in magnetic materials such as motor cores.

Highlights

Motor and transformer systems are generally composed of cores of soft magnetic materials and inverters with power semiconductors
This study shows for the first time that the SWITCH–MOS with a built-in Schottky barrier diode (SBD) can reduce the switching loss,19 and the iron loss in magnetic materials such as motor cores compared to the losses in the case of the conventional U-shaped trench gate metal-oxide semiconductor field-effect-transistor (MOSFET) (UMOS)
This study examined the impact of different diode characteristics on the magnetic hysteretic and iron loss properties of a conventional NO silicon steel sheet core under Pulse width modulation (PWM) inverter excitation

Summary

Introduction

Motor and transformer systems are generally composed of cores of soft magnetic materials and inverters with power semiconductors. The voltage and current waveforms generated by the PWM inverter has higher-order harmonic components. These PWM inputs induce complex hysteresis loops with major and minor loops in the magnetic material cores.. Previous studies have shown that minor loops are created by all the on-voltages Von of both forward and reverse properties in the semiconductor devices of inverters.. The step is to understand the influence of Von corresponding to only reverse properties, which correspond to the diode characteristics, on the magnetic properties under PWM inverter excitation. In this study, the hysteretic and iron loss properties of magnetic materials excited by an inverter using a lowVon diode were compared with those excited by an inverter using a high-Von diode

Methods

Results

Conclusion