| Electronics > Beginners |
| H-bridge doesnt supply any current. |
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| Dmeads:
Hi folks! I followed the Lewis Loflin H bridge tutorial for an SPWM signal which is great I have included my schematic, but I used a square wave to simulate in LTspice instead of the SPWM switching. also I used IRFZ24N instead of IRFZ44N MOSFETs. I get a nice sinusoidal output with a high resistance RC filter, but no matter what load i stick on the bridge, my power supply says the H bridge never draws more than 1mA, which from simulation I learned is for the 10kohm pullup resistors with a 10V supply voltage. Does anyone know how my H bridge can output more current? I would eventually like to use it to drive an induction motor. Thanks! |
| james_s:
Your circuit is not the same. One has all N channel mosfets, the other has N and P channel mosfets, at least it looks that way from the picture. |
| garethw:
You’re trying to turn on an N-channel mosfet by grounding it and that will not work. You can’t swap p and n channel devices without reconfiguring the circuit. Sent from my iPhone using Tapatalk |
| Mechatrommer:
if you do that in real life, you will burn all the mosfets. |
| mc172:
--- Quote from: Mechatrommer on September 08, 2019, 09:51:44 pm ---if you do that in real life, you will burn all the mosfets. --- End quote --- Well that's a great help to the OP, nice one for helping him to understand why. :palm: |
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