Controller for heated gloves/socks

Discussion in 'The Projects Forum' started by enveetee, Dec 3, 2009.

  1. enveetee

    Thread Starter New Member

    Dec 1, 2009
    5
    0
    Hi, first post so be gentle!!!


    I'm looking to make a controller for some heated garments. I've sorted the garments and heating element fine, it all works off a 3cell Lipo battery.

    I need to solve two problems.

    1) Heat regulation. Each glove/sock draws between 300 and 700 mAh @ 12V depending on how warm they need to be. I have found a circuit based on a NE555, LM393 and a FET (IRF540) which seems to do the job (I need to build and test it.)

    2)Battery protection. I need to protect the battery. Lipos go crazy if discharged below 3V per cell so I need a cut off at around 10V to protect them. I was thinking of using a MAXIM 8211 or 8212 voltage detection IC and a relay to disconnect the circuit at 10V or so.

    Does this sound feasible? Should I be taking another approach? Can anyone suggest a circuit or give me some ideas on how to proceed?

    Cheers

    Nigel
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    What is the voltage of your 3-cell LIPO battery?

    It would help a great deal if you would post the circuit diagram (schematic).
    IRF540 MOSFETs require a Vgs of 10v (voltage on the gate using the source as a reference). NE555 is a bjt (bipolar junction transistorized) 555 timer, it requires at least 6v to operate, and it's output will not go higher than Vcc-1.3v even under light load.

    Disconnect is not a problem using a MOSFET and some simple circuitry. You really don't want to use a relay, as it will draw a lot of power by itself.

    Does this sound feasible? Should I be taking another approach? Can anyone suggest a circuit or give me some ideas on how to proceed?[/QUOTE]

    I thought you had a circuit already?
     
  3. enveetee

    Thread Starter New Member

    Dec 1, 2009
    5
    0
    Thanks for taking time to responde

    10V nominal


     
    Last edited: Dec 4, 2009
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