Fan failure alert for electronic equipment
First Claim
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1. A fan failure alert for electronic equipment comprising:
- a fan alert circuit coupled between a fan and its power source, said alert circuit comprising;
a resistance sensing and pulse producing means for generating pulses having a frequency proportional to the fan'"'"'s operating speed;
an amplifier for receiving said pulses from said resistance sensing and pulse producing means;
a frequency-to-voltage converter circuit coupled to said amplifier for producing an output voltage level in response to said amplified pulses;
a reference voltage source connected to said resistance sensing and pulse producing means in parallel with said amplifier and said converter for setting a reference voltage level;
a voltage comparator circuit receiving said reference voltage level and said output voltage level for comparison and for generating a signal responsive to a difference between said reference voltage level and said output reference level; and
a switch connected to said comparator circuit operable in response to said signal for actuating an alert means.
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Abstract
A detection and alarm circuit for protection of electronic components includes a fan motor current sensing resistor for producing a pulse that is amplified and introduced to a frequency-to-voltage converter for generating a filtered and processed voltage level for application to a voltage comparator. A reference voltage circuit supplies a voltage level to the comparator for matching with the filtered and processed voltage level and depending on the mismatch, an output signal is introduced to a transistor switch for operating an alert alarm device.
76 Citations
7 Claims
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1. A fan failure alert for electronic equipment comprising:
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a fan alert circuit coupled between a fan and its power source, said alert circuit comprising; a resistance sensing and pulse producing means for generating pulses having a frequency proportional to the fan'"'"'s operating speed; an amplifier for receiving said pulses from said resistance sensing and pulse producing means; a frequency-to-voltage converter circuit coupled to said amplifier for producing an output voltage level in response to said amplified pulses; a reference voltage source connected to said resistance sensing and pulse producing means in parallel with said amplifier and said converter for setting a reference voltage level; a voltage comparator circuit receiving said reference voltage level and said output voltage level for comparison and for generating a signal responsive to a difference between said reference voltage level and said output reference level; and a switch connected to said comparator circuit operable in response to said signal for actuating an alert means. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification