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Cooling Fan Circuits
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Last Updated on: Wednesday, July 16, 2014 06:34 AM

 

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
3-Pin Fan in 4-Pin Socket -  The most recent PC motherboards provide four pin connectors for cooling fans especially for the CPU fan. The older three pin fans are controlled by varying their DC voltage….must register on this site.... [Published in Elecktor July/August 2010]
AC line powers microcontroller-based fan-speed regulator -  9-Nov-06 Issue of EDN  Capacitor drops voltage, decreases waste heat in line-powered controllers..... [Design Idea by Abel Raynus, Armatron International Inc, Malden, MA; Edited by Brad Thompson and Fran Granville]
ADT7463 Configurations -  AN-612 Analog Devices Application Note  (app note added 2/06)
AN-1260: Autonomous Fan Control for Processor Systems using the LM85 -  National Semiconductor Application Note  (app note added 2/06)
AN-1262: Four-Speed Fan Control using Simple Remote Diode Temperature Sensor -  National Semiconductor Application Note  (app note added 2/06)

AN-345: Grounding for Low-and-High-Frequency Circuits -  AN-345 Analog Devices Application Note  (app note added 2/06)
AN-348: Avoiding Passive-Component Pitfalls -  AN-348 Analog Devices Application Note  (app note added 2/06)
AN-349: Keys to Longer Life for CMOS -  AN-349 Analog Devices Application Notes  (app note added 09/08) Here's How CMOS Can be Protected Against Abuse
AN36 ZXBM200x Series of Variable Speed 2-Phase Fan Motor Controller -  Zetec Semiconductors  Applications NotesThis applications document is intended to aid users in ir development of  controller electronics for fan and blower motors using  ZXBM200x series of variable speed, 2-phase, DC brushless motor controllers.   (app note added 2/06)
AN-612: ADT7463 Configurations -  AN-612 Analog Devices Application Note  (app note added 2/06)
AN-613: Programming the Automatic Fan Speed Control Loop -  AN-613 Analog Devices Application Note  (app note added 2/06)
AN-699: Noise Filtering & the ADT7461 -  AN-699 Analog Devices Application Note  (app note added 2/06)
AN-702: Using the ADT7461 as a Multichannel Temperature Sensor -  AN-702 Analog Devices Application Note  (app note added 2/06)
AN764: Implementing Temperature-Based Variable Fan Speed Control in Nlx Power Supplies -  Microchip Application Note Published 4-Feb-03  (app note added 2/06)
AN767: Interfacing Microchip’s Fan Speed Controllers to a SPI? -  Microchip Application Note Published 12-Nov-02  (app note added 2/06)
AN768: Redundant Fan Systems using the TC647 Fan Manager -  Microchip Application Note Published 4-Feb-02  (app note added 2/06)
AN770: Linear Voltage Fan Speed Control using Microchip's TC64x Family TC642, TC646, TC648 -  Microchip Application Note Published 27-Jul-04  (app note added 2/06)
AN771: Suppressing Acoustic Noise in PWM Fan Speed Control Systems -  Microchip Application Note Published 27-Jul-04  (app note added 2/06)
AN-772: A Design & Manufacturing Guide for the Lead Frame Chip Scale Package -  AN-772 Analog Devices Application Note  (app note added 2/06)
AN772: Speed Error in PWM Fan Control Systems TC646, TC647, TC649 -  Microchip Application Note Published 27-Jul-04  (app note added 2/06)
Audio amp makes efficient fan controller -  11/09/00 EDN-Design Ideas.....You can use discrete transistors to vary power to a fan to control its speed. However, with a simple modification, you can use an audio-amplifier IC to control a fan module (Figure 1). The LM4872….PDF contains multiple circuits, scroll to find the one of interest..... [Design Idea by Wallace Ly, National Semiconductor Corp, Santa Clara, CA]
Autonomous Fan Control for Processor Systems using the LM85 -  National Semiconductor Application Note  (app note added 2/06)
Avoiding Passive-Component Pitfalls -  AN-348 Analog Devices Application Note  (app note added 2/06)
Boost Converter Controls 12 Volt Fan from 5 Volt Supply -  12/12/97 EDN-Design Ideas.....Temperature-controlled PWM boost converter allows operation of a12V brushless dc fan from a5V supply.… [Design Idea by John McNeill, Worcester Polytechnic Institute, Worcester, MA]
Ceiling Fanspeed Control -  Ceiling Fan Speed Control - For one of those 3 or 4 blade decorative fans…. [Reverse engineered schematic by Stepan Novotill]
Circuit Generates Analog Fan Speed Control -  Maxim-IC Appnote #1125 / (app note added 5/08) -This circuit delivers a continuous and linear fan-control voltage that is proportional to temperature.
Circuit protects system from overheating -  8-Nov-01 Issue of EDN  The two-chip circuit in Figure 1 provides fan control and overtemperature warning and shutdown signals to protect systems from excessive heat. The circuit monitors the temperature of the pc board and the die temperature of a CPU, an FPGA, or another IC with an on-chip temperature-sensing transistor..... [Design Idea by Kerry Lacanette, Maxim Integrated Products, Sunnyvale, CA]
Circuit provides efficient fan-speed control -  4-Mar-04 Issue of EDN  As Moore's Law plunges us into the realm of multigigahertz processors and PCs with gigabytes of RAM, engineers face the task of removing the heat that these state-of-the-art components produce. Cooling such systems poses a dilemma. If you optimize the fan size and speed for nominal operating conditions, the system is susceptible to failure when conditions deteriorate..... [Design Idea by John Guy, Maxim Integrated Products, Sunnyvale, CA]
Computer Fan Speed Tacho Out Circuit: Add a Fan Speed Monitor Lead to Any 12V Two Wire Fan.  -  Add a fan speed monitor lead to any 12V two wire fan.  You will find this identical circuit inside most 3 wire computer fans with speed monitoring output to the motherboard.  Peel off the sticker from the fan hub in order to access a motor winding pin for connecting up the tacho circuit..... [Circuit by Stepan Novotill]
Cooling Fan Controller -  As we begin to enjoy those lazy hazy days of summer, the most important thing on most of our minds is how to keep cool during those hot days. For some of us that means turning up the old air conditioner and sipping on a nice cold glass of our favorite soft drink. However, we often forget about an equally important..... [Radio Amateur Society of Norwich]

         

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