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Fan control circuit

A fan control and fan voltage technology, applied in pump control, non-varactor pump, machine/engine, etc., can solve the problems of poor fan voltage regulation, no over-temperature protection, and difficulty in meeting heat dissipation requirements and noise requirements at the same time. Achieve the effect of high adjustment accuracy, strong adjustability, and meet the requirements of heat dissipation and noise

Active Publication Date: 2015-04-08
GUANGDONG VTRON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. It is difficult to accurately control the minimum voltage of the fan, which cannot meet the noise requirements of the fan in the low power consumption state
[0004] 2. The fan voltage is poorly adjustable, and it is difficult to meet the heat dissipation requirements and noise requirements of the system under different load conditions at the same time
[0005] 3. No over-temperature protection function

Method used

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Embodiment Construction

[0016] The solution of the present invention is explained in detail below in conjunction with the drawings.

[0017] The fan control circuit of the present invention, such as figure 2 As shown, it includes a fan voltage regulation circuit, which is connected to the negative pole of the fan, namely point A, and mainly includes a transistor Q1 and an operational amplifier IC1A.

[0018] The triode is a PNP type triode, the collector of which is grounded, the emitter is connected to the negative pole of the fan, and the base is connected to the output terminal of the operational amplifier IC1A through a resistor R2.

[0019] The negative electrode of the operational amplifier IC1A is connected to the fan negative electrode, grounded, and the input voltage Vin through resistors R1, R4, and the thermistor RT1, and the positive electrode is grounded through resistor R6 and resistor R5, and connected to the input voltage Vin, and the ground terminal is grounded. , The power supply terminal...

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Abstract

The invention discloses a fan control circuit. An operational amplifier is adopted to be a core device for controlling the voltage of a fan, the characteristics of the operational amplifier are utilized, the fan voltage and minimum voltage can be controlled through regulating peripheral resistance, the fan control circuit has the advantages of high regulating precision and strong adjustability, and accordingly, heat dissipation requirements and noise requirements under different load conditions as well as the noise requirements in a low power state on products are satisfied. Moreover, the invention further designs an over-temperature protection circuit so as to improve the product safety.

Description

Technical field [0001] The invention relates to the technical field of fan control, in particular to a fan control circuit. Background technique [0002] Traditional fan control circuit such as figure 1 As shown, the control circuit uses two voltage regulator tubes to control the minimum voltage and maximum voltage of the fan, and realizes the control of the fan voltage curve by adjusting R1, which has the following defects: [0003] 1. It is difficult to accurately control the minimum voltage of the fan, and cannot meet the noise requirements of the fan under low power consumption. [0004] 2. The fan voltage is poorly adjustable, and it is difficult to simultaneously meet the heat dissipation and noise requirements of the system under different load conditions. [0005] 3. There is no over-temperature protection function. Summary of the invention [0006] Based on the above situation, the present invention proposes a fan control circuit to improve the controllability and control acc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D27/00
Inventor 弓金文赖增茀郑维
Owner GUANGDONG VTRON TECH CO LTD