Electronic Circuits Doris Kim, Soongsil University

Electronic Circuits Doris Kim, Soongsil University 3. AC circuit analysis: Various bridge circuits 4. Structure of transformers: Mutual inductance, transformer ratio, and practical transformers. AC Circuit Analysis Part 2

 This is an introductory course on the basics of electronic circuits. The covered subjects are DC and AC circuits, diodes, semiconductors, and transistors. The students are required to become familiear with electronic circuits and their roles in modern experimental instruments. Since this is not an engineering course, theoretical or analytical details on electronic circuits will not be covered. Instead, basic concepts of circuit elements and practical methods on how to build electronic circuits will be emphasized.

Design for Reliability of Power Electronics for Grid-Connected Photovoltaic Systems Yongheng Yang, Ariya Sangwongwanich, Frede Blaabjerg

Design for Reliability of Power Electronics for Grid-Connected Photovoltaic Systems Yongheng Yang, Ariya Sangwongwanich, Frede Blaabjerg 

 Abstract—Power electronics is the enabling technology for optimizing energy harvesting from renewable systems like Photovoltaic (PV) and wind power systems, and also for interfacing grid-friendly energy systems. Advancements in the power semiconductor technology (e.g., wide band-gap devices) have pushed the conversion efficiency of power electronics to above 98%, where however the reliability of power electronics is becoming of high concern. Therefore, it is important to design for reliable power electronic systems to lower the risks of many failures during operation; otherwise will increase the cost for maintenance and reputation, thus affecting the cost of PV energy. Today’s PV power conversion applications require the power electronic systems with low failure rates during a service life of 20 years or even more. To achieve so, it is vital to know the main life-limiting factors of power electronic systems as well as to design for high reliability at an early stage. Knowhow of the loading in power electronics in harsh operating environments (e.g., fluctuating ambient temperature and solar irradiance) is important for life-time prediction, as the prerequisite of Design for Reliability (DfR). Hence, in this paper, the technological challenges in DfR of power electronics for grid-connected PV systems will be addressed, where how the power converters are stressed considering real-field mission profiles. Furthermore, the DfR technology will be systematically exemplified on practical power electronic systems (i.e., gridconnected PV systems). Index Terms—Reliability, design for reliability, power electronics, physics of failure, mission profiles, thermal loading, degradation, Monte Carlo method, photovoltaic systems.
LINK
https://vbn.aau.dk/ws/portalfiles/portal/250508960/Yongheng_Yang_CPSS_Transactions_on_Power_Electronics_and_Applications_CPSS_TPEA_vol.....pdf

Oscilloscope measurements in power electronics: II. Differential probe - Prof. Sam Ben-Yaakov

Prof. Sam Ben-Yaakov is the Chief Scientist Officer, Director, and co-founder of Green Power Technologies Ltd. He brings to the Company his entrepreneurial experience in theoretical and practical Power Electronics and analog electronic circuits and systems. Prof. Sam Ben-Yaakov serves as a professor and a researcher in the Department of Electrical and Computer Engineering, Ben-Gurion University, Israel. For several years Prof. Ben-Yaakov served as the Chairman and Head of Institute of Electronics of the Ben-Gurion University. In addition he is a well-known consultant to many companies worldwide.

Embedded Computing Design: Pre-Switch Demo in the Lab-Pre-Switch demonstrates their forced-switching AI power technology

This unrehearsed video shows Pre-Switch's James Hamond (CTO) and Derek Kroes (VP Engineering) demonstrating a 10KW full bridge solar inverter running Pre-Switch's AI forced-resonant soft-switching technology (Pre-Flex). Pre-Flex uses a learning AI to predict and generate a forced-resonance voltage waveform, timed accurately to enable zero voltage switching. The demonstration shows discrete IGBTs running at 50Khz at 98.5% efficiency, inverting 320Vdc to 240Vac. Able to work for both IGBT's and wide-bandgap devices, Pre-Flex enables switching losses to be reduced from 80% (IGBT), and 95% (wide-bandgap) enabling up to a 5X to 20X faster Fsw when compared to hard-switched legacy solutions.
LINK
https://www.pre-switch.com

Measuring the Plant Transfer Function of ​a Digitally Controlled Converter-Dr. Ali Shirsavar

Measuring the plant of a digitally controlled converter is not as straightforward as in the analog case. The solution however is quite simple. Set the compensator to a constant value and measure the loop. Dr. Ali Shirsavar explains the details and how to connect the Bode 100 to perform the measurement. Check out www.biricha.com to learn more about digital control of power converters.