An online extraction method of junction temperature in IGBT devices with saturation voltage drop
The junction temperature, working performance, lifespan, and reliability of insulated gate bipolar transistor (IGBT) modules are closely related. Achieving online monitoring of IGBT junction temperature is of great significance to improve the reliability and extend the service life of power electron...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Department of Electric Drive for Locomotives
2023-09-01
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| Series: | 机车电传动 |
| Subjects: | |
| Online Access: | http://edl.csrzic.com/thesisDetails#10.13890/j.issn.1000-128X.2023.05.019 |
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| Summary: | The junction temperature, working performance, lifespan, and reliability of insulated gate bipolar transistor (IGBT) modules are closely related. Achieving online monitoring of IGBT junction temperature is of great significance to improve the reliability and extend the service life of power electronic systems. Based on the conduction voltage drop of IGBT, this paper proposed a model and a measuring circuit for monitoring the junction temperature by low-current and high-current saturation voltage drops to achieve accurate online monitoring of IGBT junction temperature. Firstly, combined the operating principle of IGBT, the paper derived the expression for the conduction voltage drop. Then, according to the characteristics of low-current and high-current saturation voltage drop, the junction temperature monitoring models was established. Finally, it designed a low-current constant current source circuit and a conduction voltage drop sampling circuit, and conducted experiments to verify the models. The experimental results show that the low-current saturation voltage drop is linearly related to the IGBT junction temperature, while the high-current saturation voltage drop is nonlinearly related. The measurement errors for both methods are 1.29% and 4.91% respectively. |
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| ISSN: | 1000-128X |