Electronics > Electronics

H-bridge schematic review?

(1/3) > >>

ErikY:
Would anyone be so kind as to review my H-bridge schematic?

I put this together on a prototype board and its not working at all.

I tripple checked all of my connections against this circuit, and nothing at all from my motor.

My assumption is that something is wrong with my circuit design, but I am not seeing it.

I did not design this myself, I got most of it from a book with some very minor changes that I made.

Can anyone see a problem with this?

ErikY:
I just noticed that in my sch I have the BHi and BLo reversed for the pin names, I fixed that and still no motor

jwatte:
Do you have a multimeter?

What does it measure on the top, in the center, and on the bottom, as well as for the gates of the transistors?

billhowl:
What voltage you operate? higher then 10V?
MOSFET was not logic level need more then 10V to operate.

ErikY:
Guys, thanks for the replies.

I actually got it "kind of" working.

I figured out that my mosfet driver chip was bad. Not sure what I did, maybe I zapped it with static electricity, but it was definitely bad.

By testing the voltage going in and coming out, I saw it was not working.

Fortunately I had another one to use, popped it and it worked.

For some reason which I cannot figure out though, PWM is working for my forward (m1BHI High, and m1ALI PWM) but it is not working reverse, I am only getting one speed with the reverse m1AHI High, m1BLI PWM.

Can anyone make any sense out of that?

Navigation

[0] Message Index

[#] Next page

Go to full version