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I try to use a SSR instead a toggle relay to switch the polarity of a railway DCC signal at a RailSwitch middle contact. This digital signal is AC 18V, the maximal current is 3AInspired by the TIDUC87A document I create following circuit. The gray toggle switch is only to show what I want to realize.It works perfect if only one SSR is implemented ( left OR right side ) but no function if both SSR are connected.
My Questrion:Is there an integrated ( and cheep ) ready to use circuit available for a AC SSR toggle switch?Whats wrong with this circuit?
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In reply to Karsten Kankowski:
Karsten, What is speed of your communication, How quickly you will need MOSFETs to turn on and off?
In reply to Miro Oljaca79:
That is good, requirements are not too hard. Looking at your schematic it looks to me that you are making short circuit between DCC+ and DCC-. Is that correct?
What is maximum current that you are expecting and what is voltage that you are expecting between DCC+ and DCC-?
Thanks a lot for your interest!I try some different versions to control both side of MOSFET SSR with common ground. But this do not work related to the reversi diodes. So I have to spend 5 more parts and two independent ground lines. Now it´s working fine. But it seemed to be near the same costs and PCB space like a mechanical relay. My hoe was to find a more integrated solution.
The max current is less than 3A for which I chose now the IRLL024N because its reverse diode can drive 3.1A continous current. The SPDT switch using my solution with discrete parts do not create a short between DCC+ and DCC- . It is used for a mobile train railswitch which need a "polarisation" to ensure that the mobile train see allways a voltage different between its wheels.
I attach my solution here: may be someone is intereste in such a solution.
Thanks a lot again for your interest and questions! Best RegardsKarsten
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