Thunderchild
New Member
I'm looking for some sort of latch relay whereby it just takes a pulse to switch it on and another to switch it off (or a reverse polarity pulse), it needs to be as compact as an automotive relay and work on 12 V
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20+ basically i need an automotive relay replacement that latches as opposed to only being on when there is current
I'm also looking at VERY low power consumption in order to produce very little heat as i'm putting it in a rather confined space, currently the automotive relay is 3 watts, so baring using very low RDSon mosfets I need some sort of mechanically latch thing, I had thought maybe I could build something with a motor so it screws and unscrews to open and close a switch but that may become bulky and I'm not equipped to make it really
hi TC,yes well I have no problem using a transistor to drive the relay but 3 W of heat from the coil is too much for me as my case has a 10C/W temp coeficient, thats why I want it to latch so it is not on all the time and does not make much heat
Well its a power control box for a car and the "relay" must handle the full current going into the system from the dynamo, it will not need to operate quickly hence the idea of the motorised switch
Well its a power control box for a car and the "relay" must handle the full current going into the system from the dynamo, it will not need to operate quickly hence the idea of the motorised switch
by pulse i mean a 12 V power supply switched on for as long as necessary to operate but obviously not non stop like a relay, it will be MCU controlled so I can meet most requirements, I haven't looked at the specs of those switched but they look rather large, i have the space of 1 or two automotive relays, maybe i need to find a suitable motor mechanism like... oh what: a servo ! how stupid of me not to think of the obvious ! a servo can easily push a switch, now I just need to figure out how to control one from an MCU