Regulation for automotive cooling fan

Discussion in 'The Projects Forum' started by sonda, Oct 30, 2012.

Thread Status:
Not open for further replies.
  1. sonda

    Thread Starter New Member

    Oct 30, 2012
    i m looking for a temperature controll circuit which is suitable for a automobile cooling system fans.
    i need to controll 2 fans which each will draw 15A max. i need a circuit which can drive this two fans in low & high speed (according to the temp increase) or operate one fan in low temp & both at high temp.
    i did try some op amp circuits & didnt work at all. please advice me/ thanks in advance.
  2. wayneh


    Sep 9, 2010
    Can you post a schematic of what you tried? What components did you try?

    You need a temperature sensor, a comparator circuit supplied with a reference to determine the switching temperatures and then a power control circuit to control the fans.

    Is this for an automotive application?
  3. sonda

    Thread Starter New Member

    Oct 30, 2012


    Hi ,
    thanks for your response. yes this is for a automobile application. the 1st circuit i used that LM311 which was blown when i connect to power. the 2nd one works ok, but the problem is i cant make it for 2 settings.
  4. bertus


    Apr 5, 2008

    You just hijacked an existing thread:

    Now you have a thread of your own.

    I am closing this thread as it violates AAC policy and/or safety issues.

    6. Restricted topics. The following topics are regularly raised however are considered “off-topic” at all times and will results in Your thread being closed without question:

    • Any kind of over-unity devices and systems
    • Automotive modifications
    • Devices designed to electrocute or shock another person
    • LEDs to mains
    • Phone jammers
    • Rail guns and high-energy projectile devices
    • Transformer-less power supplies
    This comes from our Tos:
    Terms of Service
    There will be enough sites where automotive questions can be discussed :
    Member selected automotive forums

Thread Status:
Not open for further replies.