Method and apparatus for protecting switching element of inverte

Details Method and apparatus for protecting switching element of inverte Method and apparatus for protecting switching element of inverte

1997-02-20

1999-02-23

Barlow, John

Data processing: measuring, calibrating, or testing

Calibration or correction system

Temperature

702130, 39575001, H02M 1100, G01K 112

Patent

active

058754148

ABSTRACT:
In a method and apparatus for protecting a plurality of same semiconductor switching elements used in a PWM inverter from being overheated, a junction temperature rise T.sub.n of one of the switching elements is derived on the basis of an output frequency of the inverter (.omega. c), an output current (I) of the inverter, and a control factor (a) and when T.sub.n >T.sub.nref, the overheat in the corresponding switching element occurs so that a gate signal for each switching element is not inputted or an PWM off duty ratio on a pulse duty ratio of the gate signal is increased to limit the output current of the inverter.

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The Transactions of The Institute of Electrical Engineers of Japan vol. 111-D, No. 9,Sep. 1991, pp. 740-751 (No translation).

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