IGBT Vge higher than Vge

Discussion in 'The Projects Forum' started by sriniketh, Aug 5, 2015.

  1. sriniketh

    Thread Starter New Member

    Jul 7, 2015
    29
    0
    Hello,

    I am trying to build a circuit with IGBT and RC circuit. In which i have a situation where the emitter of the IGBT is connected to the capacitor. When the capacitor voltage is charged to voltage level higher than the gate emitter voltage, the IGBT switches to off state. How can i solve this problem . I have attached the LTspice circuit for understanding .

    Input voltage 200VDC

    Regards and Thanks in advance

    Sriniketh
     
  2. ronv

    AAC Fanatic!

    Nov 12, 2008
    3,290
    1,255
    There are several ways:
    Bootstrap driver
    Charge pump driver
    Isolated power suppy to name a few
    Have a google to see which might be best for you or tell us more about the timing of your circuit.
    PS. one post is enough. More will just make it confusing.
     
  3. sriniketh

    Thread Starter New Member

    Jul 7, 2015
    29
    0
    Thank you for the reply. I am new to this forum . i made the title wrong , didnt know to delete the thread , so made new one.

    With respect to the timing , the time period for both the IGBTs are 1000µs and

    T-on for the IGBT which is connected to capacitor is 999699ns
    T-on for the second IGBT which is connected to ground through resistive load is 100ns
     
  4. ronv

    AAC Fanatic!

    Nov 12, 2008
    3,290
    1,255
    Hmm,
    The 100 ns will be a problem for both the driver and the IGBT I think.
    http://www.irf.com/product-info/datasheets/data/ir25607.pdf
     
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