Fan operation detection circuit for a DC fan and method of operation thereof
First Claim
Patent Images
1. For use with a sensorless DC fan, a detection circuit comprising:
- a sensor, coupled to said DC fan, that senses an operational current through said DC fan and produces an intermediate signal based thereon; and
an alarm circuit, coupled to said sensor, that compares said intermediate signal to a range defined by an upper limit signal and a lower limit signal and generates an alarm signal when said intermediate signal is outside of said range.
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Abstract
For use with a DC fan, a detection circuit and a method of detecting an operational condition thereof. In one embodiment, the detection circuit includes: (1) a sensor, coupled to the DC fan, that senses a current through the sensorless DC fan and produces an intermediate signal based thereon and (2) an alarm circuit, coupled to the sensor, that compares the intermediate signal to a range defined by an upper limit signal and a lower limit signal and generates an alarm signal when the intermediate signal is outside of the range.
67 Citations
22 Claims
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1. For use with a sensorless DC fan, a detection circuit comprising:
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a sensor, coupled to said DC fan, that senses an operational current through said DC fan and produces an intermediate signal based thereon; and an alarm circuit, coupled to said sensor, that compares said intermediate signal to a range defined by an upper limit signal and a lower limit signal and generates an alarm signal when said intermediate signal is outside of said range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of detecting an operational condition of a sensorless DC fan, comprising:
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sensing an operational current through said sensorless DC fan; producing an intermediate signal based on said current; comparing said intermediate signal to a range defined by an upper limit signal and a lower limit signal; and generating an alarm signal when said intermediate signal is outside of said range. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification