Invention Application
- Patent Title: PULSE WIDTH MODULATION AND VOLTAGE TEST SIGNALS FOR FAN TYPE DETECTION
-
Application No.: US17599828Application Date: 2019-07-24
-
Publication No.: US20220206548A1Publication Date: 2022-06-30
- Inventor: Hsiang Chuan Sung , Chien Hao Chen , Fu-Yi Chen , Yi-Hsuan Huang , Chi-feng Chen
- Applicant: Hewlett-Packard Development Company, L.P.
- Applicant Address: US TX Spring
- Assignee: Hewlett-Packard Development Company, L.P.
- Current Assignee: Hewlett-Packard Development Company, L.P.
- Current Assignee Address: US TX Spring
- International Application: PCT/US2019/043265 WO 20190724
- Main IPC: G06F1/20
- IPC: G06F1/20 ; H05K7/20 ; G01P3/489

Abstract:
An example non-transitory machine-readable storage medium includes instructions to determine whether a cooling fan is controlled by pulse wave modulation (PWM) or is voltage-controlled. When executed, the instructions cause a processor of a computing device to transmit first and second PWM test signals at different PWM duties to a fan connector connected to the cooling fan, receive a first and second fan speed signals in response, and determine, when the first fan speed signal is not equal to the second fan speed signal, that the cooling fan is a PWM-controlled fan. The instructions further cause the processor to transmit first and second voltage test signals at different voltages to the fan connector, receive a third fan and fourth speed signal in response, and determine, when the third fan speed signal is not equal to the fourth fan speed signal, that the cooling fan is a voltage-controlled fan.
Information query