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Fan control circuit

A fan control and circuit technology, applied in pump control, logic circuit connection/interface layout, electrical digital data processing, etc., can solve the problems of increasing design cost, increasing design complexity, and expensive micro-control chips, etc., to simplify the circuit Effect of Design Complexity and Design Cost

Inactive Publication Date: 2010-06-16
岳阳言溪劳务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the microcontroller chip is expensive and uses a different voltage from the fan, so an additional voltage source needs to be provided for the microcontroller chip, which not only increases the design complexity, but also increases the design cost

Method used

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Examples

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no. 1 example

[0031] Please refer to figure 1 , figure 1 It is a fan control circuit diagram according to the first embodiment of the present invention. The fan control circuit 100 includes an integration unit 110 , an operational amplifier 120 , a PMOS transistor P12 and an NMOS transistor N12 . The integrating unit 110 mainly converts the two pulse width modulation signals PWM1 and PWM2 into DC voltages PV1 and PV2 for comparison. The operational amplifier 120 is coupled between the integrating unit 110 and the PMOS transistors P12 and NMOS transistors N12 for comparing the DC voltages PV1 and PV2 to determine which of the PWM signals PWM1 and PWM2 has a higher operating frequency. The gates of the PMOS transistor P12 and the NMOS transistor N12 are coupled to the output of the operational amplifier 120, and are correspondingly turned on according to the comparison result of the DC voltage PV1 and PV2 to output one of the pulse width modulation signals PWM1 and PWM2 to drive all correspo...

no. 2 example

[0036] In order to enhance the voltage conversion characteristic of the integrating unit 110, the integrating circuits 112, 114 in the integrating unit 110 can be realized by using different integrating circuits. Please refer to figure 2 , figure 2 It is a fan control circuit diagram according to the second embodiment of the present invention. The main difference between the fan control circuit 200 and the fan control circuit 100 is the integration unit 210 , which is also composed of two integration circuits 212 and 214 with the same circuit structure. The integrating circuit 212 is coupled between the negative input terminal of the operational amplifier 120 and the pulse width modulation signal PWM1 for converting the pulse width modulation signal PWM1 into a DC voltage PV1; the integrating circuit 214 is coupled to the operational amplifier 120 Between the positive input terminal and the pulse width modulation signal PWM2, used for converting the pulse width modulation ...

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Abstract

A fan control circuit comprises an integral unit, an operational amplifier, a PMOS transistor and an NMOS transistor. The integral unit converts the pulse width modulation signals into voltage and outputs the voltage to the positive and negative input ends of the operational amplifier. The PMOS transistor is coupled between the first pulse width modulation signal and an output end and the grid of the PMOS transistor is coupled with the output end of the operational amplifier. The NMOS transistor is coupled between the second pulse width modulation signal and the output end and the grid of the NMOS transistor is coupled with the output end of the operational amplifier. The fan control circuit of the invention can be directly composed of discrete components and can use the same voltage source with the fan, thus reducing the design cost and the complexity.

Description

technical field [0001] The present invention relates to a fan control circuit, and in particular to a fan control circuit suitable for servers. Background technique [0002] There are usually multiple sets of fans on the servo system for heat dissipation. As far as the current computer system is concerned, the fan control is mainly through an embedded controller (Embedded Controller, referred to as EC) on the motherboard (Mother Board) to perform overheating. Protect. The embedded controller detects the temperature of the computer system, and adjusts the operating frequency of the pulse width modulation (PWM) signal to control the speed of the system fan of the computer system, thereby achieving the effect of temperature regulation. [0003] There will be multiple sets of thermal sensors in the servo system to determine the fan speed at different positions. For example, if the main boards of two servers share a fan board, the main boards of the servers will provide differen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D27/00H03K19/0175G06F1/20
Inventor 柯廷铮黄柏学
Owner 岳阳言溪劳务有限公司