I will not be clever and tell you about how I assembled a very simple H-bridge from ordinary radio components. If anyone does not know, the H-bridge is a device that controls the rotation of the electric motor in one direction, or in the other, with a control signal.
The thyristor itself, when turned on, does not turn off, even in the absence of a control signal. Even a field-effect transistor will not break the power circuit. The thyristor will feed the gate of the transistor. An ordinary diode soldered to the thyristor control leg will fix it.
2 resistors 100 Ohm,
2 resistors 10 kOhm,
2 field-effect transistors irf 740, 10 A, 400 V,
2 thyristors KU 202N, 10 A, 400 V,
I found all the details to demonstrate the assembly's performance without leaving my home. Some were new, others used.
He took the aluminum plate, which was, drilled holes for transistors and thyristors, soldered resistances.
The plate, which is also a positive contact, was screwed to it with nuts thyristors. Diodes were soldered to the control legs of the thyristors. Through a dielectric and plastic cups, I pulled field-effect transistors with screws. I connected the gates to diodes, and I will give a control signal here. The output from the thyristor is connected to the source of the transistor. Everything is in accordance with the attached diagram. This completes the assembly. Can be connected to pins “A” and “B” ARDUINO, through silicon transistors “PNP”.
First, I connected a voltmeter to the output of the H-bridge. You can see how the polarity at the output changes when I apply a signal to points “A” and “B”. Then I connected a weak electric motor, on the gear I drew a blue dot. You can see how the direction of rotation of the gear changes. Well, at the end I took an electric motor with a gearbox from a drill, 15 V, 1.2 A. Everything works great. The main thing is not to overload the valid parameters. This assembly is rated up to 10 A. When the electric motor is started, there is a jump in Amperes by two, or three times. You can see this in the video. For more serious loads, field-effect transistors and thyristors can be assembled into assemblies, or more powerful ones can be selected.
I didn’t just invent the H-bridge, although I did, it might be said loudly, maybe someone has met something like that, but I tried. My project came to a halt when the Chinese BTS7960 43A motor driver burned out. The guys clearly overestimated the parameters, and the 24 volt limit did not suit me. So I had to break my head.
Unfinished project can be viewed
Now you will not need to carry money to cunning and greedy merchants. You can make powerful H-bridges yourself, with increased voltage.
No need to thank -)))