BS2/DS1620 Entertainment Center Cooling System
I built an entertainment system for my son, and the passive cooling features built into it turned out to be insufficient. So, I decided to design and build an active system.
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Using only a case fan was noisy, and ran at one speed independent of temperature.
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Using a variable speed fan helped, but it would run continuously at low speed wasting energy and creating unnecessary noise.
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So, I designed a circuit using a BS2, DS1620 temperature sensor/control chip, and a variable speed fan.
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The BS2 was used to program the DS1620 with the temperature power would be applied to the IRL 520 MOSFET switch, which would then pass the drive voltage to the fan. The variable speed temperature controlled fan would then run at an rpm dependent upon the temperature it sensed.
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When the temperature decreased to the lower limit programmed into the DS1620, the IRL 520 MOSFET switch would turn off, thereby turning off the drive power to the fan.
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A unique property of the DS1620, acting as a stand-alone thermostat, is its built in hysteresis on the Tcom pin. The pdf attachment explains the hysteresis.
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All of the required information to build this project is in the attached pdf document. Pictures of the key components are also attached.
·
Using only a case fan was noisy, and ran at one speed independent of temperature.
·
Using a variable speed fan helped, but it would run continuously at low speed wasting energy and creating unnecessary noise.
·
So, I designed a circuit using a BS2, DS1620 temperature sensor/control chip, and a variable speed fan.
·
The BS2 was used to program the DS1620 with the temperature power would be applied to the IRL 520 MOSFET switch, which would then pass the drive voltage to the fan. The variable speed temperature controlled fan would then run at an rpm dependent upon the temperature it sensed.
·
When the temperature decreased to the lower limit programmed into the DS1620, the IRL 520 MOSFET switch would turn off, thereby turning off the drive power to the fan.
·
A unique property of the DS1620, acting as a stand-alone thermostat, is its built in hysteresis on the Tcom pin. The pdf attachment explains the hysteresis.
·
All of the required information to build this project is in the attached pdf document. Pictures of the key components are also attached.
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Comments
I like how you came up with the ·
Very Nice Project·
I like the way you·Put all of it·Together and how well
Thought·out it is··········
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··Thanks for any·
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Sam
Post Edited (sam_sam_sam) : 8/2/2008 1:40:56 PM GMT