need help to understand H-bridge using mosfet and BJT

Discussion in 'General Electronics Chat' started by kougou, Mar 23, 2013.

  1. kougou

    Thread Starter New Member

    Oct 20, 2012
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    0
    Please refer to the photo of the attach H-bridge circuit below.

    Currently, we are using the H-bridge as a drive circuit for the series RLC resonance circuit (not the motor!). Because of this, we probably won't need LTV-827 there to electrically isolate the H-bridge.
    Because we need it to run around 80 ish kHz, and the TA said we need to add BJT there because we have high voltage ( 140 V rms )across the capacitor of RLC circuit.
    Just wondering do you guys understand why should add BJT and what effect will it bring to the circuit?
     
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  2. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    Those are not simple bjt - they are opto couplers so the signals are electrically isolated from the circuit.
     
  3. tubeguy

    Well-Known Member

    Nov 3, 2012
    1,157
    197
    Could you please clarify how the 140 V rms relates to the schematic posted.
     
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