Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/72743
Title: Minimization of current crowding during turn-off of power GTO devices
Authors: Lee, T.K.
Liang, Y.C. 
Issue Date: 1994
Source: Lee, T.K.,Liang, Y.C. (1994). Minimization of current crowding during turn-off of power GTO devices. PESC Record - IEEE Annual Power Electronics Specialists Conference 1 : 442-449. ScholarBank@NUS Repository.
Abstract: The maximum controllable anode current is influenced by the current crowding phenomenon observed in GTO thyristors during turn-off. This phenomenon initiates (1) the formation of the current filament with a density much higher than its surrounding and leads to the localized thermal instability; and (2) the conductivity modulation at the conduction channel causing a non-uniform electric field distribution within the depletion layer and resulting an early punchthrough breakdown. In this paper, device parameters are optimised by detailed two-dimensional device simulations to minimize the current crowding and at the same time to maintain a low forward voltage drop and short turn-off time. By doing so, the localized thermal stress can be reduced and a more uniform electric field distribution is obtained.
Source Title: PESC Record - IEEE Annual Power Electronics Specialists Conference
URI: http://scholarbank.nus.edu.sg/handle/10635/72743
ISSN: 02759306
Appears in Collections:Staff Publications

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