How to build a proper H-bridge that probably won't catch fire
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- เผยแพร่เมื่อ 13 ก.ค. 2024
- Lots of people asking about when this is going to be wrapped up. So here it is! Sorry it's late; I don't have the best video editing tools at my disposal.
Simulation: tinyurl.com/hcrhe6q
How not to build an H-bridge (part 1): • How NOT to Build an H-...
Transistor tutorial (part 0): • Practical Transistor T...
There are lots of other working designs, some using fewer transistors than I showed here. Here is a good blog listing many different types with discussion on pros/cons of each.
www.talkingelectronics.com/pro... - วิทยาศาสตร์และเทคโนโลยี
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IGBT exploded?? They are used for all three phase systems and some of them can deal with around 100 Amps to 300 Amps current and thousands of volts. There is nothing else there to replace IGBT or is there???
Great video! Very detailed, with very good attention to detail. Even touched on Optocouplers at the end, Nice!
Very nice explanation and useful information.
I like the video, however your explanations about the coils and the capacitor are wrong (or at least I got them wrong)…
To clarify:
The current through an inductor can not change in an instant, otherwise an overvoltage would occur, destroying the transistors (u = L di/dt), because they cannot block the voltage. This is why the Diodes are necessary - so the current isn't shut down.
Same goes for the voltage on the capacitor you talk about. It does not smooth current, it smoothes out the voltage (voltage on a capacitor cannot change rapidly without great current) and supports the ext. voltage source (battery) by supplying current in the moments it is required.
Otherwise: Great video :) Keep going!
Great video with a lot of details indeed!
great video. One point to mention: Design in circuit protection when the microcontroller may not start up fast enough to turn its outputs on/off. When the controller is in reset, it does not drive its outputs and this could cause the motor control circuit to short out if it relies on the microcontroller to sequence the transistors correctly.
This is really cool. Can you do an in depth vid about high power 30A+......?
Hi Josh ! Thanks for the video and the time on doing it. I've seen it but don't know if that's enough for a project I'm running. It includes 24V 1500W DC motors, so as you can see almost 63A and to be honest I don't know how to handle that. Could you please give me some advice. Thanks !
Great Video, but like the other one before, it could really benefit from being shortened by half.
Although I knew most of the things, I found it a bit hard to follow all the tangents.
Nevertheless it helped me a lot. So thank you very much.
Please make visual diagrams much larger on your videos that cover your screen size for clarity. But, very good video and topic. Good job.
I have some TIP120 darlington transistors. They wont work for this schematic right? coz they are npn internally. Does anyone have a diagram I could follow that would allow me to use these transistors? similar to this video? I'm pretty new to this.
Josh, I was watching your video and analysis of H bridge circuits, and I was unable to determine your education/experience in electrical engineering.
I'm assuming your a technician/technologist or P.Eng in mechatronics?
Very interesting videos
Computer engineering undergrad, but most of my experience is will full stack web. Electronics, robotics, and game dev are hobbies.
What? Binary junction transistors instead of bipolar junction transistors @ 6:37
Oops.
@@JoshSideris hey binary and bipolar only have 2 options 1 or 0 . P or N .... works in my book haha
thanks man i love u
Can someone point me in the direction of motor drivers with this level of quality or thought? Thanks
I have a dumb question, how about H bridge with just plain old electromagnetic relays in situation where I need to control 755 motor on, off and direction, does not need to be very quick, nothing fancier?
That would be an option. However, DC has a really bad tendency to weld its contacts closed.
i made the H brideg (Supply 24vDC) with TIP127(pnp) on top with 220k.....and TIP122 (npn) at bottom with 330 ohm .......i have used 1N4007 s as the freewheeling diodes......initially i got 24v at motor output .....but when i connected the 24v DC motor which consumes not more than 300mA current the voltage across motor dropped to 18v.....i want 24 volts across motor.....please suggest something....................
drive.google.com/open?id=0B_xYZc-AB1zRVmZzM25KT1g3cG8
Well first off this isn't the circuit I recommend in this video, so I can't really offer complete support on it. However, please check out my video on how NOT to build an H-bridge to understand some of the common pitfalls in H-bridge design (th-cam.com/video/xbJ0dT-VZIQ/w-d-xo.html) then return and finish watching this video so that you can hear my advice on design thinking.
Second, there are potential problems with your circuit design. For one, what is your input voltage? 5V? Unless input is equal to VCC, how is the input voltage going to fight against the 24V VCC to turn off the upper PNPs? It's just a guess on my part.