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Temperature Controller for Oven

Discussion in 'General Electronics Discussion' started by anele, Apr 10, 2017.

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  1. anele

    anele

    3
    0
    Aug 19, 2014
    I want to build a Fuzzy Oven and a controller for my final design project at University. I have encounted some problems the first being how to automatically vary the current flowing through the heat element in order to control the temperature of the oven.

    First I tried using a digital resistor connected in series with the element. I would then vary the resistance of the total circuit in order to control the current. The resistor just ended up burning up due to initial high current I believe.

    My next idea was to build a 0 - 10 A current source but cant find any schematics for this online.

    The circuit voltage supply is 220 V (ac) and the resistance of the heat element is 30 ohms (rated for 1500 W), meaning the current flowing through the element is 7.38 A when nothing else is connected.

    Can someone point me in the right direction to be able to control the temp of the element without using on/off control.
     
  2. Minder

    Minder

    3,006
    640
    Apr 24, 2015
    For a electronic version of a oven controller there is the Picmicro AN958, even comes with code!
    There is also Fairchild AN-3006 for non-micro version.
    M.
     
  3. Alec_t

    Alec_t

    2,892
    775
    Jul 7, 2015
    An element like that would be controlled by switching it on and off with a variable duty-cycle. Considering the element's high thermal inertia, the switching could be done either by phase angle control or by whole cycle counting.
     
  4. anele

    anele

    3
    0
    Aug 19, 2014
    I am quite new to electronics so this might be a dumb question. I have decided to the Picmicro AN958 circuit for control.
    does it matter what diode and transister I use for this circuit?
     
  5. anele

    anele

    3
    0
    Aug 19, 2014
    I am quite new to electronics so this might be a dumb question. I have decided to the Picmicro AN958 circuit for control.
    does it matter what diode and transister I use for this circuit?
     
  6. Minder

    Minder

    3,006
    640
    Apr 24, 2015
    The transistor is not critical, if referring to D2 then a 1n4005/7 would work..
    M.
     
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