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US 2020/0305306 A1Published application
Method and system for preventing or correcting fan reverse rotation during online installation and removal
AssigneeCisco Technology, Inc.
InventorsPaolo Sironi, Emanuele Umberto Giacometti, Rohit Dev Gupta, Joel Richard Goergen
Life of this patent
Estimating the term…
Abstract
In one embodiment, a method includes detecting reverse rotation of a fan inserted into a modular electronic system comprising at least one other fan, wherein the reverse rotation of the fan is caused by a back pressure generated by the other fan rotating in a forward direction, applying current pulses to stop reverse rotation of the inserted fan and start rotation of the fan in a forward direction, and operating all of the fans with rotation in the forward direction.
Claims20
A method comprising:
- detecting insertion of a fan into a modular electronic system comprising at least one other fan rotating in a forward direction to cool components of the modular electronic system;
- reducing a fan speed of said at least one other fan to reduce back pressure generated by said at least one other fan to prevent reverse rotation of the inserted fan;
- and
- controlling fan speed according to system temperature with all of the fans rotating in the forwarding direction.
1 more element
A method comprising:
- detecting reverse rotation of a fan inserted into a modular electronic system comprising at least one other fan, wherein said reverse rotation of the fan is caused by a back pressure generated by said at least one other fan rotating in a forward direction;
- applying current pulses to stop reverse rotation of the inserted fan and start rotation of the fan in a forward direction;
- and
- operating all of the fans with rotation in said forward direction.
1 more element
A modular electronic system comprising:
- an electronic module;
- at least two removable fans for cooling the electronic module;
- and
- a fan controller for controlling the speed of the fans and receiving input comprising the speed and direction of rotation of the fans,
- wherein the fan controller is operable upon detecting reverse rotation of one of the fans to initiate application of current pulses to the fan to stop reverse rotation of the fan.
2 more elements
Dependencies are inferred from the claim text.