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Ghimire P.,University of Aalborg | Pedersen K.B.,University of Aalborg | Rannestad B.,WindSolutions | Munk-Nielsen S.,University of Aalborg
Microelectronics Reliability | Year: 2015

This paper presents monitoring of ageing in high power insulated gate bipolar transistor (IGBT) modules subjected to sinusoidal loading at nominal power level. On-state voltage for IGBT, diode, and rise in interconnection resistance are used as ageing parameters. These are measured in three different ways: calibration of power modules after 24 h of operation, offline characterization every 5 min of operation, and continuous measurement during normal converter operation. Four power modules are tested, which are cycled to different degradation levels by number of cycles, where one is tested until failure. The characterization at different stages of lifetime indicates that the rise in resistance originates from thermo-mechanical degradation of interconnects. Post-test investigations: four-point probing and micro-sectioning indicate thermo-mechanical induced degradation of the chip topside interconnects as the source for rise in resistance. Major degradations are observed in bond wires and metallization on the low side diode.


Ghimire P.,University of Aalborg | Trintis I.,University of Aalborg | Munk-Nielsen S.,University of Aalborg | Rannestad B.,WindSolutions
Microelectronics Reliability | Year: 2015

Power semiconductor devices are the most fragile components limiting reliability of power converters, where major stresses are temperature dependent parameters. Typically, the operating virtual maximum junction temperature is specified by a manufacturer for each individual device. The thermal system and operating load are designed based on this number. Online monitoring of an on-state collector-emitter voltage (υ ce,on) and a junction temperature is necessary to ensure the design performance within a safe limit and also to make this method applicable for derating/uprating power. This paper presents the real time measurement of υ ce,on and thereby the junction temperature estimation in high power converters. Knowing these parameters online, the maximum power capability can be detected. The operating maximum junction temperature is selected and thereby based on the operating condition the derating of power is shown for a megawatt (MW) converter. An experimental setup including online monitoring is described and the measurement of power derating is presented at the specified conditions. © 2015.


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Trademark
WindSolutions | Date: 2010-02-09

Computer programs, namely, software used for downloading, transmitting, receiving, editing, extracting, encoding, decoding, reading, saving and organizing computer files, audio, video and/or multimedia data. [ Telecommunication services, namely, electronic transmission of files via computer networks and other telecommunication networks; provision of access to data networks on Internet; rental and provision for free of access time to data networks ]. Provision of software which can be downloaded from a global computer network (Internet) intended for the transfer, the synchronization and the management of multimedia data, of electronic text documents, of data bases, of backup data and of application programs, between a computer and a portable telephone or other multimedia reader device; consulting with regard to software, software development and design, software installation; software updating.


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News Article | July 31, 2007
Site: techcrunch.com

We all have iPods and Hickey already told us what to do if it breaks. But, say, you hate Hickey and don’t believe a word he says. Fair enough, but your iPod could still die an untimely death. Sad, yes, but WindSolutions has released CopyTrans Doctor iPod, software that’s still in beta that may, just may fix your hosed iPod. It sounds like DiskWarrior et al. in that it attempts to fix disk errors. It also will attempt to fix holes in your iPod-iTunes library. (Songs listed in the iPod but not actually there, in other words.) Windows-only, but Macs are perfect so iPod-owning Mac users won’t even have to bother.

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