Electricity: electrical systems and devices – Safety and protection of systems and devices – Circuit interruption by thermal sensing
Patent
1995-01-11
1996-10-22
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Circuit interruption by thermal sensing
361115, H02H 504
Patent
active
055683509
ABSTRACT:
A fusible link provided in a power supply of a computer system for providing evidence of an over temperature condition to document a fan failure in the event of catastrophic failure of the power supply. The power supply typically includes a temperature detection circuit often including a thermistor providing a signal indicative of an over temperature condition in the power supply. A latch circuit coupled to the temperature detection circuit shuts the power supply down in an attempt to prevent such catastrophic failure. In a circuit according to the present invention, a fuse is coupled to the temperature detection circuit where the fuse open-circuits when an over temperature condition is detected. Such blown fuse documents the over temperature condition. An external pin provided through a Zener diode and coupled to the fusible link enables external determination of the state of the fuse without disassembling the power supply. In particular, a current source and voltmeter is connected to the external pin, where the current source injects current and the voltmeter measures the voltage indicative of the state of the fuse. In this manner, the present invention provides documentation of an over temperature condition existing prior to failure of a power supply, which typically indicates malfunctioning of the cooling fan.
REFERENCES:
patent: 3828289 (1974-08-01), Hickling
patent: 5140258 (1992-08-01), Bishop
Dell USA L.P.
Gaffin Jeffrey A.
Garrana Henry N.
Jackson S.
Kahler Mark P.
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