Author Topic: MOSFET reverse polarity protection + crowbar circuit combined  (Read 871 times)

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Offline ZhenekTopic starter

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MOSFET reverse polarity protection + crowbar circuit combined
« on: August 14, 2019, 05:55:35 pm »
I'm trying to combine two well known circuits, one is reverse polarity protection with MOSFET, another is crowbar circuit against overvoltage. Before trying to make the real circuit on the breadboard, I've decided to simulate it in TINA. However, I can't make it working. Separately both snippets work. Below is schematic and simulation result. It seems that SCR is always on for the reason I cannot explain.
In real application I supposed to place a fuse where ammeter is on my schematics. Zeners are rated 15V.
What am I doing wrong?
 

Offline ZhenekTopic starter

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Re: MOSFET reverse polarity protection + crowbar circuit combined
« Reply #1 on: August 14, 2019, 09:38:18 pm »
Ok, changing SCR to TRIAC makes all the difference, now it's working as expected. Still I cannot explain, any ideas?
 


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