Transactions of China Electrotechnical Society  2021, Vol. 36 Issue (12): 2522-2534    DOI: 10.19595/j.cnki.1000-6753.tces.201442
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Online Junction Temperature Extraction for SiC Module Based on Built-in Temperature Sensor
Liu Ping, Li Haipeng, Miao Yiru, Chen Changle, Huang Shoudao
College of Electrical and Information Engineering Hunan University Changsha 410082 China

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Abstract  

Silicon carbide (SiC) MOSFET has the advantages of high switching speed and low loss, which will be more and more widely used in high efficiency and high power density applications. In these applications, SiC MOSFETs are facing severe reliability tests, and the online accurate extraction of junction temperature is essential for lifetime prediction and health assessment. This paper proposed an online junction temperature extraction method for power module based on built-in negative temperature coefficient (NTC) temperature sensor. First, the thermal network model between the built-in NTC sensor and the power chips considering the thermal coupling effect was established, and a fast loss calculation method for SiC MOSFET was proposed. Then, the thermal network parameters were extracted by finite element simulation, and the stability of thermal network parameters under different boundary conditions was verified. Simulation and experimental results show that the proposed method can accurately obtain the dynamic junction temperature, and the thermal network model parameters are not affected by changes in boundary conditions such as ambient temperature and heat dissipation conditions. It is suitable for junction temperature monitoring and lifetime prediction under real mission profiles.

Key wordsNegative temperature coefficient temperature sensor      SiC MOSFET      thermal network model      chip temperature     
Received: 30 October 2020     
PACS: TM46  
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Liu Ping
Li Haipeng
Miao Yiru
Chen Changle
Huang Shoudao
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Liu Ping,Li Haipeng,Miao Yiru等. Online Junction Temperature Extraction for SiC Module Based on Built-in Temperature Sensor[J]. Transactions of China Electrotechnical Society, 2021, 36(12): 2522-2534.
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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.201442     OR     https://dgjsxb.ces-transaction.com/EN/Y2021/V36/I12/2522
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