Current magnitude sensing circuit
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United States of America Patent
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-
May 9, 2000
Grant Date -
N/A
app pub date -
Aug 12, 1996
filing date -
Sep 7, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A current magnitude sensing circuit for detecting a malfunction of a DC brushless fan. The current magnitude sensing circuit detects drops in the current magnitude in windings of a fan motor. Depending on the frequency of the current drops in the fan current, the current magnitude sensing circuit outputs either a high or a low voltage signal. The current magnitude sensing circuit operates by charging a capacitor beyond a certain voltage and thereby providing a high fan fail output signal when a fan is spinning too slowly for proper cooling of a device. Another capacitor is charged at a different time constant for setting the fan fail output of the current magnitude circuit low for indicating that the fan is spinning sufficiently fast.
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