System Electrothermal Transient Analysis of a High Current (40A) Synchronous Step Down Converter

2019 ◽  
Author(s):  
Rajen Murugan ◽  
Jie Chen ◽  
Todd Harrison ◽  
C. T. Kao ◽  
Nathan Ai
Keyword(s):  
Transient Analysis ◽  
Multichip Module ◽  
High Current ◽  
Power Mosfets ◽  
Modeling Methodology ◽  
Low Profile ◽  
Essential Components ◽  
Thermal Measurements ◽  
Evaluation Module ◽  
Step Down

Abstract In this paper, we detailed the system electrothermal transient co-design modeling and silicon validation effort that led to the industry’s first highly efficient, highest power density (40A) synchronous step-down converter. The device was designed in an innovative multichip module (MCM) low-profile LQFN packaging technology. By integrating the control and drive circuitry with two discrete N-channel power MOSFETs, significant reduction in system on-resistance, RDS(ON), was achieved. The validity of the co-design electrothermal modeling methodology was assessed by comparing directly to silicon thermal measurements made on an evaluation module (EVM) which comprises the inductor, capacitor, and other essential components. Correlation between simulation and laboratory measurements on the integrated solution will be discussed.

scholarly journals Multiple Heat Source Thermal Modeling and Transient Analysis of LEDs

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1860 ◽  
Author(s):  
Anton Alexeev ◽  
Grigory Onushkin ◽  
Jean-Paul Linnartz ◽  
Genevieve Martin
Keyword(s):  
Heat Source ◽  
Transient Analysis ◽  
Thermal Power ◽  
Finite Element Models ◽  
Heat Sources ◽  
Thermal Measurements ◽  
Thermal Transient ◽  
Transient Thermal ◽  
Transient Measurements

Thermal transient testing is widely used for LED characterization, derivation of compact models, and calibration of 3D finite element models. The traditional analysis of transient thermal measurements yields a thermal model for a single heat source. However, it appears that secondary heat sources are typically present in LED packages and significantly limit the model’s precision. In this paper, we reveal inaccuracies of thermal transient measurements interpretation associated with the secondary heat sources related to the light trapped in an optical encapsulant and phosphor light conversion losses. We show that both have a significant impact on the transient response for mid-power LED packages. We present a novel methodology of a derivation and calibration of thermal models for LEDs with multiple heat sources. It can be applied not only to monochromatic LEDs but particularly also to LEDs with phosphor light conversion. The methodology enables a separate characterization of the primary pn junction thermal power source and the secondary heat sources in an LED package.

Fabrication of high current and low profile micromachined inductor with laminated Ni/Fe core

2002 ◽  
Vol 25 (1) ◽  
pp. 106-111 ◽  
Author(s):  
Jin-Woo Park ◽  
Jae Yeong Park ◽  
Yeun-Ho Joung ◽  
M.G. Allen
Keyword(s):  
High Current ◽  
Low Profile

Economic woes to mark succession preparation in Cuba

2017 ◽  
Keyword(s):  
Economic Reform ◽  
Foreign Investment ◽  
Vice President ◽  
Reform Process ◽  
Economic Downturn ◽  
Social Unrest ◽  
Content Type ◽  
Low Profile ◽  
Step Down ◽  
The Eu

Subject The Cuban economy. Significance Less than three months before President Raul Castro is due to step down from the state leadership, Cuba’s economy is in decline and its reform process has stalled. Castro’s heir apparent, Vice President Miguel Diaz-Canel, is keeping a low profile and promising continuity. An emerging independent media is causing concern in government circles but has not yet led to a crackdown. Impacts The economic downturn will strain society but an outburst of social unrest remains unlikely for now. As US pressure and domestic tensions rise, Havana will strive for cohesion, even if this stalls economic reform. Trump's confrontational politics force Havana to seek foreign investment elsewhere and to maintain good relations with the EU and Canada.

Modeling of Formation of Readiness of Cadets of Military Institutions of the Troops of the National Guard of the Russian Federation for Command Activity

2021 ◽  
pp. 101-114
Author(s):  
Alexey Alexandrovich Tsybulko ◽  
◽  
Alexander Nikolaevich Dakhin ◽  
Keyword(s):  
Comparative Analysis ◽  
Vocational Training ◽  
National Guard ◽  
Professional Experience ◽  
Modeling Methodology ◽  
Modeling Process ◽  
Essential Components ◽  
The Future ◽  
The Russian Federation ◽  
The Military

Problem and Aim. The article considers the problem of modeling such a pedagogical phenomenon as the cadet’s readiness for command activity. The military professional experience of the future officer was formalized and the correlation of “readiness” with the traditional competence of the military man was validated. The essential components of the modeling process of the cadet’s readiness for command activity are established, the criteria for the effectiveness of such modeling are determined. The purpose of the article is establish the essential components of the process of modeling the readiness of the cadet for command activity, determine the criteria for the effectiveness of such modeling. Methodology. Research methods: comparative analysis of military-vocational training technologies, highlighting the essential intentions of the cognitive plan in them, followed by designing a criteria base for the effectiveness of using such technologies in the formation of cadets’ readiness for command activities. The article considers the problem of modeling such a pedagogical phenomenon as the cadet’s readiness for command activity. The military professional experience of the future officer was formalized and the correlation of “readiness” with the traditional competence of the military man was validated. The essential components of the modeling process of the cadet’s readiness for command activity are established, the criteria for the effectiveness of such modeling are determined.

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