Fan failure alert for electronic equipment

Details Fan failure alert for electronic equipment Fan failure alert for electronic equipment

1995-07-10

1996-07-09

Swann, Glen

Communications: electrical

Condition responsive indicating system

Specific condition

310 68B, 310 68C, 324166, 340635, 340661, 340663, G08B 2100

Patent

active

055348548

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.

REFERENCES:
patent: 3885200 (1975-05-01), Burkle
patent: 4479115 (1984-10-01), Holzhauer
patent: 4977375 (1990-12-01), Toth

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