I bought an old zetagi power supply some time ago. It is rated 30 amps 1 minute on and one minute off at 13.xx volt.
It made a buss noise for a while and then the bridge rectifier died shortly after FB2502 bridge.
I googled it, it is 25 amps max and cannot deliver 30 amps for one minute.
I put meters in it voltage, ac amps, and some fans to cool it and I replaced it with bridge gbpc5010. (silver ones chinese 1$)
Today I wanted to do a field strength meter tests and pulled 30 amps out of the AC side. Even not after a minute of taking that it smoked with a loud bang and then a few smaller bangs. I opened the case and the only thing that was really hot was the didoe bridge gbpc5010 and I could smell diode smell, so its gone.
There are no small condensators over the bridge as you see in many designs. (103)
I know it was only pulling 30 amps at the AC side. Bit puzzled what should I put in there?
At the DC side it was delivering about 16 amps at 14 Volt to my transmitter..
There is also another protection circuit with a tyristor but it was cool, so it did not activate. The tyristor is only activated at +15V and there are some filters not to make it jump active to early.
The bridge rectifier is screwed to the main cool block and with that it holds a pcb with paralell 8x4700uf. From there it goes to another pcb wich drive the good old 4x2n3055 wich share the cool block as well.
It made a buss noise for a while and then the bridge rectifier died shortly after FB2502 bridge.
I googled it, it is 25 amps max and cannot deliver 30 amps for one minute.
I put meters in it voltage, ac amps, and some fans to cool it and I replaced it with bridge gbpc5010. (silver ones chinese 1$)
Today I wanted to do a field strength meter tests and pulled 30 amps out of the AC side. Even not after a minute of taking that it smoked with a loud bang and then a few smaller bangs. I opened the case and the only thing that was really hot was the didoe bridge gbpc5010 and I could smell diode smell, so its gone.
There are no small condensators over the bridge as you see in many designs. (103)
I know it was only pulling 30 amps at the AC side. Bit puzzled what should I put in there?
At the DC side it was delivering about 16 amps at 14 Volt to my transmitter..
There is also another protection circuit with a tyristor but it was cool, so it did not activate. The tyristor is only activated at +15V and there are some filters not to make it jump active to early.
The bridge rectifier is screwed to the main cool block and with that it holds a pcb with paralell 8x4700uf. From there it goes to another pcb wich drive the good old 4x2n3055 wich share the cool block as well.
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