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Fan rotating speed adjusting circuit

A technology for adjusting circuit and fan speed, applied in the direction of high-efficiency adjustment technology, electrical components, electrical equipment structural parts, etc., can solve the problems of slow heat conduction response, damage to switching power supply, long time and so on

Inactive Publication Date: 2015-07-01
HONG FU JIN PRECISION IND WUHAN CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional thermistor responds slowly to heat conduction, and the heat generated by the switching power supply takes a long time to conduct to the thermistor
The switching load of the switching power supply changes quickly. When the switching power supply outputs a large current, it cannot be detected by the thermistor in time, resulting in the rapid rise of heat on the switching power supply and the speed of the cooling fan cannot be increased in time, which is likely to cause damage to the switching power supply.

Method used

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  • Fan rotating speed adjusting circuit
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Embodiment Construction

[0011] see figure 1 , in a preferred embodiment of the present invention, a fan speed adjustment circuit is used to adjust the speed of a fan 300, the fan 300 is a power supply 310 heat dissipation, the power supply 310 outputs a first The DC voltage supplies power to a load 320 . The fan speed regulation circuit includes a current detection circuit 100 and a temperature detection circuit 200 . The current detection circuit 100 receives a first reference voltage, and detects the change of the first DC voltage output by the power supply 310 . The current detection circuit 100 compares the detected change of the first DC voltage with the first reference voltage, so as to output a first regulation voltage. The temperature detection circuit 200 receives a second reference voltage and the first regulation voltage. The temperature detection circuit 200 detects the temperature change of the power supply 310 to receive a second regulation voltage. The temperature detection circuit...

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PUM

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Abstract

A fan rotational speed adjusting system includes a power supply unit, a fan, a current detecting circuit and a temperature detecting circuit. The current detecting circuit detects a first DC voltage from the power supply unit, compares the first DC voltage with a first reference voltage, and outputs a first adjusting voltage. The temperature detecting circuit detects a temperature change of the power supply unit, and outputs a second adjusting voltage. The temperature detecting circuit receives the first adjusting voltage, compares the first adjusting voltage and the second adjusting voltage with a second reference voltage, and outputs a third DC voltage to the fan. The fan rotates in the corresponding rotational speed, and dissipates heat for the power supply unit.

Description

technical field [0001] The invention relates to a regulating circuit, in particular to a fan speed regulating circuit which can precisely regulate the speed of the fan according to the heating condition of the heating element. Background technique [0002] At present, most switching power supplies of desktop computers use cooling fans to dissipate heat. The traditional fan speed adjustment circuit monitors the heating status of the switching power supply in real time through a thermistor, and adjusts the cooling fan speed according to the heating status of the switching power supply. The traditional thermistor responds slowly to heat conduction, and the heat generated by the switching power supply takes a long time to conduct to the thermistor. The switching load of the switching power supply changes quickly. When the switching power supply outputs a large current, it cannot be detected by the thermistor in time, resulting in the rapid rise of heat on the switching power sup...

Claims

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Application Information

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IPC IPC(8): F04D27/00
CPCF04D27/004H05K7/20136Y02B30/70
Inventor 范永昌
Owner HONG FU JIN PRECISION IND WUHAN CO LTD