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US 2016/0258437 A1Published application
Fan operation detection
AssigneeHewlett-Packard Development Company, L.P.
InventorsPedro Miguel Teixido Rovira, Santiago Sanz Ananos, Fernando Bayona Alcolea
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Abstract
Inputting an input resistance to an operational amplifier. Detecting whether a number of fans are in operation based on the input resistance to the operational amplifier by driving a number of resistors connected in series in a fan circuit associated with the number of fans.
Claims15
A system for fan operation detection, comprising:
- a fan, comprising a circuit including a resistor in series with a transistor;
- and
- an operational amplifier that drives the resistor of the fan and detects operation of the fan based on an input resistance.
A method for fan operation detection, comprising:
- driving a number of fault resistors associated with a number of fans with an operational amplifier;
- inputting an input resistance to the operational amplifier;
- and
- comparing a voltage reference to an output of the operational amplifier.
1 more element
A system for fan operation detection, comprising:
- a number of fans coupled to an operational amplifier in series, wherein each of the number of fans comprises a circuit including a resistor in series with a transistor;
- an operational amplifier configured to
- drive the resistor of each of the number of fans;
- and
- detect whether each of the number of fans are operating based on an input resistance using a voltage reference.
2 more elements
Dependencies are inferred from the claim text.