Basic 4-Transistor MOSFET H-Bridge

[f.hababorbitz]

Your older H-bridge designs is what brought me to your channel.
My current project is improving the speed control on a milling machine power feed. These use universal motors, and are just SCR half wave controlled. Reversing is done with micro switches the reverse the connection of the field coils. Once I figured out that a H-bridge will not reverse the motor (I thought universal motors worked the same as PM motors), now I'm back to an improved PWM design that is much faster then 60Hz.
The problem with all these power feed after market units, the sweet spot on the speed potentiometer is so very small, from not rotating to too fast. I'm going to use an encoder so there will be feedback in the system. This will also let me have electronic limit switch end points.
So I can use a DPDT relay to switch the field coil, or figure out a solid state one. The direction change would only occur when the current is zero, so arching of relay contacts will not be an issue. I just think solid state is the way to do this. And that is effectively an H-bridge. And would be the design you have in this video.
I'm a retired EE, 10 years now.

[BillDemos]

What a bliss to have found your channel. Subscribed when I came across the photovoltaic optocoupler video of yours, we are lucky to have such good content online! This here is the standard CMOS implementation, MOSFETS requiring a P on top and an N at the bottom, naturally forming a NOT gate, with field effect transistors. I love you have extended it to allow for higher voltages that the MOSFET gates natively tolerate, in the standard CMOS implementation, you don't even have those as your rail is always within the region, and the silicon goes as fast as it can. One could ofcouse manufacture a p and a n mosfet with a thicker gate insulator to allow for 30 volts of input, and in that configuration nothing else is needed except the transistors and how you lay them to do any logic. I have three videos on the complete design starting with the CMOS not gate and then the AND and the OR on my channel, if you have a look you will see we have no mercy on the transistors, all gates are either connected to the up or the down rail directly. Best regards, happy to see so nicely made videos :)

[kokeskokeskokes]

I love to see more, it's been a while.

[stevecummins]

Thanks.
Maybe use photovoltaic optocouplers to allow use of identical n-channels on both low and high side.

[juanriofrio]

Hello Sir, I would like to ask a question about MOSFETs.... I'm trying to add a remote on and off switching to a 12vdc lamp. I'm trying to use a tsop1730 receiver which will drive a pnp transistor that connect to the 12v in order to power the lamp.I found that the light just flicker rapidly but doesn't stay on. So thinking and looking for a solution, I thought replacing the transistor with a pnp mosfet will do the job. I just not sure if will be possible, perhaps there is a simpler better solution to accomplish the on and off switching. Any help or advice will be appreciated very much. Thank you

[yavuzokuyan]

Does it have PWM control? Can a 40 amp motor be driven in this circuit?

[analoghardwaretops]

Basically the " dead time" (when all 4 Tx's.are "OFF") is only ensured if one doesn't press both push buttons simultaneously..
it is possible to provide this with both push buttons being of 1NO/1NC type...( at least..) instead of just an 1NO
Here the NC of one being in series with NO of the other...

[eng_mo_ah]

your circuit doesn't make sense, you will blow up lower MOSFET because gate voltage will be 24V, and Why use zener diode ! While you make a voltage decided on the gate of the up MOSFET ?