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Stunning 3000A, 2000A, 3000T power supply discovery - MUST READ IF YOU HAVE ONE

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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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