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In Reply to: RE: Help needed: Significant Voltage drop after PS caps posted by banpuku on January 29, 2017 at 09:49:21
Have you checked either of the two DC Link capacitors, especially C1, for leakage?
What is the DC resistance of each of the two chokes?
How much V is dropped across each of those two 15K resistors? (Thus you can calculate the total current draw of your circuit downstream from the filter.)
I am rather surprised there is not at least a small voltage drop across each of L1 and L2.
Follow Ups:
Are you running the supply with a test load? Without a load, there is no current through the circuit and therefore is not a true test of the circuit. I usually test a supply with a high wattage resistor based on the current that I intend to draw from the supply.
Your numbers appear strange since the intersection of L1, L2, and C1 is one point, so you should not get 380v and 152v at the same spot.
The DC resistance of the chokes is 140 ohms.
VDC is the same before and after the 15k resistor.
Do me a return favor, please do tell me what you hear. Thanks.
Jeff Medwin
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