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What???Mr.Cool said:lamps are usually AC powered so your mosfet must be able to conduct in both directions.
What would the purpose of a high-side MOSFET be, unless you use a H-bridge with 4 MOSFETs?Mr.Cool said:also, do not inturrupt the power to the lamp via the ground or neutral wire, but instead interrupt the hot wire.
How do you know it's a 12V DC lamp? I can't see "The Focus" mention that anywhere.The Puma said:Its a simple 12V lamp DC and maybe later a relay
What???
MOSFET able to conduct in both directions???
What about the built-in reverse voltage diode placed between drain and source in all MOSFET transistors? This diode will always conduct in one direction, so you can never break the voltage in one direction of a MOSFET. The built-in diode will always conduct when you reverse the voltage.
What would the purpose of a high-side MOSFET be, unless you use a H-bridge with 4 MOSFETs?
I have never heard of such a MOSFET, can you plese give a link to one?Mr.Cool said:i was thinking of a MOSFET without any internal diode.
no i can not, because they do not exist. i work with IGBTs mostly and have to add external diodes, i confuse myself and was thinking of igbts i guess... there are many igbts without antiparallel diode, but due to the way mosfets are made they contain the diode.I have never heard of such a MOSFET, can you plese give a link to one?
it is about maintaining a constant connection with the ground. it is exactly the same reason why all house wiring has a switch on the HOT wire and never the neutral.I can't see why it should be more safe to break the high voltage side than the GND side. It should make no difference, so why not do it at the GND side, which is easiest.
Yes, but there's a very big difference between house wirering and 12 V.Mr.Cool said:it is about maintaining a constant connection with the ground. it is exactly the same reason why all house wiring has a switch on the HOT wire and never the neutral.I can't see why it should be more safe to break the high voltage side than the GND side. It should make no difference, so why not do it at the GND side, which is easiest.
Mr.Cool
Why do you want to isolate the GND???SPATAN said:use opto isolate TLP250 for separate GND