Was just wondering if someone could comment on a battery switcher I am making for my boat
This is just phase 1, the actual switcher. I will later on add a "Low voltage cut" circuit on the Battery supply as well.
The purpose for this circuit is that I have a LED TV w/banned in a boat that will consume up to 22W at 12V
When I dock my boat I normally go over to 220V main power and prefer my TV to run on 220V mains, rather than the 12V battery.
Here is the circuit so far. I have tested it on a protoboard on a 0.23A fan and monitored the output on my scope. Seems to be quite smooth. The Relay is stated to switch in 2-5ms and the 4700uF Cap is the biggest I have in my collection at the moment. I do not want the TV to "reset" when the relay switches powersupply.
not sure if the FR107 is needed? I just added it incase I put other electronics on that side.
The 1N5408 I had to add to get the Relay to turn off immediatly. without it the relay got power from the Cap.
On my protoboard I use a DPDT relay and also separate the grounds. Can this in worst cases blow the Cap? when the relay switches over and then switches both ground and 12V? I am doing this because I am very afraid of ground currents in my boat. That can do lots of harm.