Products > Test Equipment
Stunning 3000A, 2000A, 3000T power supply discovery - MUST READ IF YOU HAVE ONE
TheSteve:
Rework done.
Installed the ESCOS-TDK B43644B5107M000 capacitor and Bournes 75K CRM2512-FX-7502ELF resistors.
PCB was a little toasted under the original 22K resistors, the glue that held the parts on was very crispy and burnt.
Good for another 10 years I hope.
EE-digger:
Looks good and the 75k resistors will keep it comfortable for a long time. My new Murata is hissing at me so the cleaned up original may go back into the scope.
tautech:
Seems an unusual SMPS design needing bleed resistors on the HV DC cap. :-//
Normal modern SMPS design has the controller remain working until the HV DC cap gets discharged to low and safe levels.
TheSteve:
--- Quote from: tautech on January 31, 2024, 08:26:17 am ---Seems an unusual SMPS design needing bleed resistors on the HV DC cap. :-//
Normal modern SMPS design has the controller remain working until the HV DC cap gets discharged to low and safe levels.
--- End quote ---
The datasheet tells the tale - it has very poor efficiency(but good power factor). I guess the design is minimum 15 + years old but even then it is pretty weak.
EE-digger:
I have a second Murata coming in at noon. If it is quiet, it's going in and the cleaned up original goes on the shelf until I need to use my service agreement. Then the old supply goes back in, etc. ;)
And Steve, you can't say these supplies haven't been burned in :)
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