Lookup NU author(s): Mahera Musallam,
Professor Paul Acarnley,
Dr Len Pritchard,
Professor Volker Pickert
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Reliable functioning of a power electronic switching device is limited not only by the instantaneous device junction temperature but also by its variation. A technique for reducing the device temperature variation is described. A simplified mathematical model of the thermal process in the device is evaluated in real time to estimate the instantaneous device temperature. A temperature control loop adjusts the device switching losses to compensate changes in conduction loss, thus keeping the total losses, and hence the temperature, substantially constant. This principle is applied to a pulsed power supply and to a PWM converter operating at a very-low-frequency (0.1 Hz) output power modulation. The amplitude of device temperature variations is reduced by at least 50%. © 2008 Elsevier Ltd. All rights reserved.
Author(s): Musallam M, Acarnley PP, Johnson CM, Pritchard L, Pickert V
Publication type: Article
Publication status: Published
Journal: Control Engineering Practice
Print publication date: 01/12/2008
ISSN (print): 0967-0661
ISSN (electronic): 1873-6939
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