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Stochastic PWM methods to inhibit junction temperature rise in IGBT module
Zihui Liu,Jiaqing Ma,Zhiqin He,Qinmu Wu 전력전자학회 2024 JOURNAL OF POWER ELECTRONICS Vol.24 No.4
The insulated gate bipolar transistor (IGBT) module is a core component of high-power electronic device systems. Since the junction temperature of an IGBT module increases with operation, the junction temperature of the IGBT module is the main cause of failure, which seriously affects the safe and stable operation of systems. To restrain the junction temperature and to improve the reliability of IGBT modules during operation, a new stochastic pulse width modulation (PWM) strategy is proposed. It is deduced that this method can do a good job of restraining the junction temperature of IGBT modules. The effectiveness of this method is verified on an experimental platform of a permanent magnet synchronous motor system. Experimental results show that the stochastic PWM has a good inhibitory effect on the junction temperature of IGBT modules in the same cycle, and that the difference of the most significant inhibition effect is about 3.27 K. The proposed stochastic PWM has practical engineering significance in terms of restraining the junction temperature of IGBT modules.
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Jiaying Wang,Zihui Ma,Chengtao Wang,Wei Chen 한국식품과학회 2024 Food Science and Biotechnology Vol.33 No.8
Auricularia auricular (A. auricula), a nutritious fungus and traditional medicinal resource, is known for melanin. This review aims to summarize the research progress on melanin in A. auricula, specifically focusing on biosynthesis, fermentation production, extraction processes, physicochemical characterization, biological functions, and applications. The biosynthesis of melanin in A. auricula primarily involves the oxidative polymerization reaction of phenolic compounds. To enhance melanin production, strategies such as deep fermentation culture, selection of optimal fermentation materials, and optimization of the culture medium have been employed. Various extraction processes have been compared to determine their impact on the physicochemical properties and stability of melanin. Moreover, the antioxidant and antibiofilm activities of A. auricula melanin, as well as its potential beneficial effects on the human body through in vivo experiments, have been investigated. These findings provide valuable insights into the application of A. auricula melanin and serve as a reference for future research in this field.
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