Interesting stuff - truck air conditioner unit board

[budm]

Re: Interesting stuff - truck air conditioner unit board

How is the Anode and the Cathode are connected?

[Th3_uN1Qu3]

Re: Interesting stuff - truck air conditioner unit board

But here is the deal. I have been thin king about the diode (the huge one) which is on input side, just after fuse. Can it really work with diode being in conducting state between voltage and ground

Yes. It is called a reverse protection diode. It is soldered reverse polarity, so that, in normal operation, it does nothing. When the power supply is wired in reverse, it limits the output voltage to its voltage drop below ground (it is usually a schottky so that means -0.2-0.3v), so the circuitry after it is never exposed to a high negative voltage. High current goes thru it and it blows the fuse.

[budm]

Re: Interesting stuff - truck air conditioner unit board

Crowbar protection in case of wrong polarity voltage is applied to the unit.

[tom66]

Re: Interesting stuff - truck air conditioner unit board

Possibly a surge suppressor diode, like a TVS.

[Behemot]

Re: Interesting stuff - truck air conditioner unit board

Yes yes yes. I turned it arround and was surprised why the hell the fuse still keeps blowing when the transistor is good, when everything is good

OK, now I think it could work, will connect it to the rest and see whether it will fire up. What I carefoully measued, no voltage anywhere, I guess you have to turn the thing on using some of the panels which are in the truck obviously.