Temperature control of a heater cartridge

Discussion in 'The Projects Forum' started by Amanullah Tomal, Sep 8, 2016.

  1. Amanullah Tomal

    Thread Starter New Member

    Sep 8, 2016
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    Hi, I am a student. I have a low basic in electronics and circuits,
    I need some help for making a circuit to control temperature of a heater cartridge.
    I have the following things
    Cartridge heater Voltage: 12V power 40W
    Thermistor:NTC 100K B=3950
    I want to control temperature using NI USB 6211
    Please help me making the circuit and wiring. If i need to buy any thing please suggest me.
     
  2. #12

    Expert

    Nov 30, 2010
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    I have a thermistor thermostat laying around, but the USB I don't. Here's a datasheet for the requested interface:
     
  3. Amanullah Tomal

    Thread Starter New Member

    Sep 8, 2016
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    I want help regarding wiring and making circuits. For circuit should I buy anything like Relay/ MOSFET. I have just got some ideas but not sufficient.
     
  4. #12

    Expert

    Nov 30, 2010
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    So, what's the deal here? You want to start with, "How to solder" and make your first project a USB controlled heater?
    Have you heard about Ohm's Law? Watt's Law? Have you ever designed any circuit?

    ps, here's the thermostat. You will have to change some resistors to make it compatible with a 100K thermistor.
    http://forum.allaboutcircuits.com/blog/lm723-as-a-thermostat.532/
     
  5. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    Your circuit could be based on something like this :-
    HeaterControl.JPG
     
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  6. Amanullah Tomal

    Thread Starter New Member

    Sep 8, 2016
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    Hi Alec_t,
    Thanks a lot for your reply.
    Plese clarify me the following things, in USB6211 you have shown A & D here A= ANALOG INPUT
    D= DIGITAL OUTPUT/PWM right???
    2. +5V will come from USB 6211 right??
    3. what is Trim?
    4. There are 3 pins for N- MOSFET. Gate, Source and Drain
    Please elaborately tell me only about these 3 pins connections.
    5. will you suggest me which N- MOSFET will be suitable for my application?? is there any model number?
     
  7. Amanullah Tomal

    Thread Starter New Member

    Sep 8, 2016
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    6. Another thing I want to keep the temperature constant at 200C. For this one should I need anything more??
     
  8. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    Right.
    No. From the USB bus. According to the datasheet the USB6211 is "bus-powered".
    A trimmer potentiometer wired as a rheostat, to allow setting of the input operating point if need be.
    Yes. The pinout depends on the particular FET you choose/ can obtain where you live.
    Don't know your component source. Do you buy locally or on-line? Can you access Farnell, Digikey, Mouser, .....?
     
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  9. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    You may do. Depends on what you are heating, how accurate the temp must be, how fast the system must respond to thermal transients, etc. A PID controller (Google will explain) may be required.
     
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  10. Amanullah Tomal

    Thread Starter New Member

    Sep 8, 2016
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    I buy from the both of the sources that means locally/ online. I can access DIGIKEY.
     
  11. #12

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    Nov 30, 2010
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