flyback inductor uninsulated

Discussion in 'General Electronics Chat' started by yougarage, Nov 18, 2014.

  1. yougarage

    Thread Starter New Member

    Nov 29, 2010
    16
    0
    Hello! I'm a beginner in electronics, I was wondering if this circuit I designed can work (picture attached)
    It should work this way: a square wave is applied to the the IGBT (300 volts clamp) gate. When the IGBT is on, the inductor charges. When the gate goes low, a high flyback voltage is generated from the inductor resulting in a capacitor charge of higher voltage than 12 v.
    Can this work as a simple step up converter? Thanks for your advice!
    circuit.png
     
  2. yougarage

    Thread Starter New Member

    Nov 29, 2010
    16
    0
    I forgot to add a diode to prevent capacitor shorting to ground when IGBT is on
    circuit.png
     
  3. crutschow

    Expert

    Mar 14, 2008
    13,001
    3,229
    Yes, you have the basic design of a voltage boost converter circuit. Note that the output voltage is not regulated and can go to a very high value.
    D1 does not do anything since it is always reversed biased by the +12V supply.
     
  4. yougarage

    Thread Starter New Member

    Nov 29, 2010
    16
    0
    Is this design going to produce lot of noise in the 12v supply line when the flyback charges the capacitor? How could it be avoided?
     
  5. crutschow

    Expert

    Mar 14, 2008
    13,001
    3,229
    It can be minimized by adding a ceramic 0.1uF cap directly between the top of the inductor and the ground point of C1
     
Loading...