Method for identifying an overload current of an electric drive
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United States of America Patent
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Oct 17, 2006
Issued Date -
N/A
app pub date -
Jun 27, 2003
filing date -
Sep 26, 2002
priority date (Note) -
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Abstract
The invention relates to Method to detect a sluggishness or the blocking of an electric drive (3), which is triggered via a power semiconductor component (7). The electric drive (3) can be operated in both a partial load range (PWM timing signal<100%) as well as in a full load range (PWM timing signal=100%), but always as a function of the timing of the PWM signal (29, 30). An evaluation circuit (37) is connected with a micro-controller (25). Pulses generated within a time interval are detected in the evaluation circuit (37) from the current I flowing via the first power semiconductor component (7) and the number of detected pulses A1*, A2* are compared with a to-be-expected number of pulses A1, A2.
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