System for preventing fan rotating speed signal current from flowing backwards

A technology of fan speed and signal current, which is applied in the computer field and can solve problems such as burning board ICs

Inactive Publication Date: 2019-05-24
ZHENGZHOU YUNHAI INFORMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the internal MOSFET or triode of the fan fails, and the Gate terminal and the Drain terminal are short-circuited, the level of the internal Gate terminal of the fan is directly connected to the V on the board. FG Level, the power supply inside the fan is generally 54V or 12V level, short circuit may burn out the IC on the board

Method used

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  • System for preventing fan rotating speed signal current from flowing backwards
  • System for preventing fan rotating speed signal current from flowing backwards

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Embodiment Construction

[0023] In order to make the object, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0024] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are to distinguish two entities with the same name but different parameters or parameters that are not the same, see "first" and "second" It is only for the convenience of expression, and should not be construed as a limitation on the embodiments of the present invention, which will not be described one by one in the subsequent embodiments.

[0025] Based on the above purpose, the first aspect of the embodiments of the present invention provides an embodiment of a system for preventing backflow of fan speed signal current. figure 2 Shown is a schematic diagram of the system.

[0026] Su...

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Abstract

A system for preventing fan rotating speed signal current from flowing backwards comprises a CPLD, an input pin of the CPLD is connected to a fan fault alarm signal pin of a fan connector, and the CPLD is configured to output an enable signal from an output pin in response to receiving a fan fault alarm signal at the input pin; The output end of the BUFFER is connected to the BMC, the input end ofthe BUFFER is connected to a fan rotating speed feedback signal pin, and the enable pin of the BUFFER is connected to the output pin of the CPLD; Wherein the positive electrode of the diode is connected to a board card power supply, the negative electrode of the diode is connected to a fan rotating speed feedback signal pin, and the BUFFER is configured to respond to an enable signal received bythe enable pin and block the transmission of the fan rotating speed feedback signal to the BMC. System according to the invention, When a MOSFET or a triode for controlling a TACH signal in the fan breaks down, the TACH signal can be controlled. When the GATE end and the Drain end are short-circuited, the power supply of the P3V3 _ STBY on the board card can be protected from being broken down bythe high voltage of the fan, and the chip on the board card is protected from being burnt out by the high voltage and the high current of the fan end.

Description

technical field [0001] This field relates to the field of computers, and more particularly relates to a system for preventing the reverse flow of fan speed signal current. Background technique [0002] The server controls the chip management fan through the BMC (baseboard controller). The BMC monitors the temperature information of each location in the server, and under the guidance of the control strategy, controls the fan to generate different speeds. Fan control signals usually include PWM (pulse width modulation signal), TACH (fan speed feedback signal), presence detection, and LED control signals. The BMC outputs a pulse width modulation signal through the PWM signal, and controls the fan with a different high-level duty cycle to generate different rotation speeds; the fan receives the PWM, generates different speeds, and then sends the actual speed data information through the TACH signal, Send it to the BMC control chip, so that the control chip can read the speed in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F1/30G06F11/30F04D27/00
Inventor 王培培孔祥涛
Owner ZHENGZHOU YUNHAI INFORMATION TECH CO LTD
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