H bridge Simulation

Discussion in 'General Electronics Chat' started by Chacabucogod, Oct 21, 2014.

  1. Chacabucogod

    Thread Starter New Member

    Nov 16, 2013
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    I'm modelling an H-Bridge on pspice, but when I connect all my transistors it stops working. Any idea why?

    [​IMG]
    [​IMG]
     
  2. crutschow

    Expert

    Mar 14, 2008
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    3,229
    The input control high voltage must equal the power supply voltage to turn off the PNPs.
     
  3. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    The base current of the NPN s is only (1-0.65)/1k = 350uA

    As Zapper points out, the base drive for the PNPs is totally wrong
     
  4. Chacabucogod

    Thread Starter New Member

    Nov 16, 2013
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    1
    Well. If I tried to make this into a high voltage h bridge (120 V) I certainly wouldn't use a 120 volts signal to drive the BJTS. Is there another way to do this?

    Thank you.
     
  5. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    What are you trying to drive? Voltage? Current? What provides the drive signals? What is the switching rate? PWM?
     
  6. ScottWang

    Moderator

    Aug 23, 2012
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