Venkadesh_M
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Then this is not a at all rectifier............
No sir , Our project need this negative as full as positive .. !!
I post the photo that require for output !
did you see it ?! here it is View attachment 82650
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Our project depends on DC MOTOR on the load
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Also , I don't get it form your design ,, when you put the same component in the upper 2 thyristors but in other hand of the lower 2 thyristor in completely different connection form the opto-coupler into thyristor !! 8-O
you can see from your design U2 & U4 are the same .. and U1 & U3 are the same but not the same for all of the thyristor ?!
why we just but the same material for the full bridge ..
People actually use to name it controlled rectifier.Then this is not a at all rectifier...
People actually use to name it controlled rectifier.
But your optocouplers don't have 400V or so voltage rating, isn't it? Trigger transformer is the classical solution, opto triacs can be used if dV/dt is low enough to avoid self-triggering.
Gate reference here is floating... View attachment 93746.....I want to control the scr from microcontroller which has separate grounding. I dont want to mix the Microcontroller Ground with High voltage ground. How to do it..
I think the gate current need to flow in microAmps with respect to Cathode of scr. But Cathode of SCR is in +Ve output of DC voltage.. Help me in this regard
In the circuit you shown, the Cathode is connected to ground, so you can get the zero referencing...But look at the controlled bridge rectifier, the cathode of SCR is not connected to ground, It is connected to the power + Bus DC Voltage. So your circuit is not applicable to this case. Plz think it again. Thanks for the reply
It can't work, for the simple reason that no transistor opto-coupler stands 300 or 400 V. I already mentioned this in post #42, don't know if you just ignored the comment or don't understand the problem. :-(The circuit i connected the SCR with optocoupler will work...???
It can't work, for the simple reason that no transistor opto-coupler stands 300 or 400 V. I already mentioned this in post #42, don't know if you just ignored the comment or don't understand the problem. :-(
P.S.: I don't discuss the meaningless case shown in your schematic, where the opto coupler LEDs are always powered . If we want the thyristors permanently turned on, we place diodes instead.
It can't work, for the simple reason that no transistor opto-coupler stands 300 or 400 V. I already mentioned this in post #42, don't know if you just ignored the comment or don't understand the problem. :-(
P.S.: I don't discuss the meaningless case shown in your schematic, where the opto coupler LEDs are always powered . If we want the thyristors permanently turned on, we place diodes instead.
In the second diagram , Another end of secondary side of Pulse transformer is connect to AC line..It is dangerous, that High voltage AC line is directly connected to Return path of pulse transformer. It may be OK for some theoretical explanation But It will not work in practical application.
I wonder if I missed something in the schematic? The secondary side is connected to AC line, that's no problem. The primary side is isolated. It's not just a theoretical explanation, it's a fully working circuit.In the second diagram , Another end of secondary side of Pulse transformer is connect to AC line..It is dangerous, that High voltage AC line is directly connected to Return path of pulse transformer. It may be OK for some theoretical explanation But It will not work in practical application.
You can do it with a single SCR connect the load in series with a diode bridge and connect an SCR between positive and negative outputs of the bridge Very easy
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