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Real-time Thermal Management of Power MOSFETs in a Motor Drive
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| Author(s) |
C.D. French; P.P.Acarnley; C.M.Johnson |
| Abstract |
This paper introduces a closed-loop observer for the real-time estimation of the active junction
temperature in a power MOSFET, using measurements of the device electrical terminal quantities:
current and on-state voltage. The observer has been implemented using a TMS 320C31 40MHz digital
signal processor, which is capable of performing the dual tasks of current control and temperature
estimation at the modulation frequency of 8.3kHz. Experimental results verify that the instantaneous
temperature of a power device can be monitored throughout the range of operating conditions
(conduction and freewheeling) encountered in a variable-frequency variable-voltage converter
controlled by pulse width modulation. The effect of modelling errors on the quality of temperature
estimates is illustrated. Because modelling errors result in current estimation errors, a measure of
modelling error is readily available. |
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| Filename: | EPE1999 - PP00403 - French.pdf |
| Filesize: | 372.6 KB |
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| Type |
Members Only |
| Date |
Last modified 2004-03-26 by System |
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