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

 

The input control high voltage must equal the power supply voltage to turn off the PNPs.

 

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

 

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.

 

What are you trying to drive? Voltage? Current? What provides the drive signals? What is the switching rate? PWM?

 

Please refer to the circuits of New H-Bridge Design.