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ZHONG XIAOLE,최성열(Seong-Yeol Choi),김영석(Yeong-Seuk Kim) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.6
The increase of integration and power density make over current and over temperature protection circuits necessary. A low-dropout regulator (LDO) with protection circuits is designed based on traditional structures of LDO. Over current protection circuits convert the detecting current into the gate voltage which controls the switch MOSFET. Using the temperature characteristic of Bipolar Junction Transistor(BJT) conducting voltage, over temperature protection circuits can invert the comparator and protect the whole chip. The circuits is designed based on 0.18㎛ CMOS technology. The LDO input voltage is 1.8 V, and the output voltage is 1.3 V, the maximum output current is 10mA.
Gui-Bao Wang,Hong-Zhong Huang,Yu Liu,Xiaoling Zhang,Zhonglai Wang 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.10
The article aims to estimate the uncertainty of possible failure events of redundancy systems based on the crossentropy (CE) method. Failure events of subsystems and components always result in the incomplete or complete failure of engineering systems, yet optimal condition monitoring of a complex system is heavily dependent on the accuracy analysis of all the failure events of subsystems and components and their interaction effects. The CE method is a versatile tool for estimating probabilities of rare events in complex systems with the least bias beyond conditional constraints. In this paper we introduce the CE method for analyzing the system reliability with the highest uncertainty among all possibilities satisfying supplied moment constraints, and developed numerical CE algorithms capable of estimating the uncertainty of failure modes in an M-dimensional redundancy system domain with moment constraints of order up to N. A general computational framework of event estimation and condition monitoring of redundancy systems is illustrated in which the Monte Carlo simulations and CE optimization algorithms are combined. Numerical results indicate potential improvements in the measure of the uncertainty of redundancy systems that would lead to the best-fit analysis of all the complete or incomplete failure events.
Sudharsan Chinnaiyan,David Gonzalez Castillo,Pengyu Lai,Salahaldein Ahmed,Hao Chen,Xiaoling Li,Riya Paul,Yuxiang Chen,Zhong Chen,H. Alan Mantooth 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-
This paper proposes a gate driver design for high-temperature power module applications based on low-temperature cofired ceramic (LTCC) substrates. The proposed gate drivers reduce the problem caused by thermal cycling and help achieve closer system integration. This makes the integrated power module operate in a wider range of temperatures and reduces the overall size of the power system. This work compares two suitable LTCC gate drives for use in conjunction with the power modules. Both LTCC-based gate drivers were characterized from 25℃ to 250℃. The experimental results of the gate drives resulted in fall and rise times of 61.28 ns and 31.5 ns, and 31 ns and 170 ns, respectively, for version-1 and version-2. In addition, a power module with integrated LTCC-based gate drivers is proposed.