Timeline for Aluminum Electrolytic Capacitor Dissipation Factor
Current License: CC BY-SA 3.0
19 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| May 12, 2014 at 3:57 | history | protected | CommunityBot | ||
| Aug 23, 2013 at 8:54 | history | edited | Brian Wang | CC BY-SA 3.0 |
Added ripple current measurements/observation
|
| Aug 22, 2013 at 0:55 | comment | added | Brian Wang | @Remiel I will have to ask my colleague to modify the cap to give it a longer leg since it is a snap-in type. Hopefully, it does not have any impact on the behaviour. The choke in the schematics is not used and is replaced by a pair of thick wires. | |
| Aug 22, 2013 at 0:51 | comment | added | Brian Wang | @Remiel I bought the caps off mouser and they should be brand new. I measure two types of Nichicon caps (LS and GU series) and all of them (about 10 pcs) exhibit the same low capacitance, but with-in-spec behaviour... I don't have prior experience with Nichicon caps so I have no idea if this generally holds true or not. | |
| Aug 21, 2013 at 19:01 | answer | added | user16324 | timeline score: 0 | |
| Aug 21, 2013 at 11:17 | comment | added | Stephen Collings | Also, it's pretty unusual for a large electrolytic cap to be on the low-end of its spec when new. My experience has been that they start on the high end of their spec, then decay with use. Are these brand new caps? Of course, I'm not terribly familiar with how LCR meters operate on caps of that size. We typically measure capacitance by charging to full voltage and then observing the decay constant when a resistor's attached. | |
| Aug 21, 2013 at 11:10 | comment | added | Stephen Collings | My first step would be to put an AC current clamp around the lead to the cap. Also, you do have a choke shown in the drawing. You could put the values into the equations here: electronics.stackexchange.com/questions/60847-/… Smaller capacitance will, indeed, increase the ripple currents. | |
| Aug 21, 2013 at 8:11 | history | edited | Brian Wang | CC BY-SA 3.0 |
Added measurements by a LCR
|
| Aug 21, 2013 at 6:10 | history | tweeted | twitter.com/#!/StackElectronix/status/370065341101408256 | ||
| Aug 21, 2013 at 2:06 | comment | added | Brian Wang | @Remiel Could you recommend a way to measure the ripple current for the capacitor? There is no choke in the current path. I have edited the post with the schematics. Thanks. | |
| Aug 21, 2013 at 2:04 | comment | added | Brian Wang | @BrianDrummond I though 6A is only seen by the motor and the ripple current for the capacitor should be less. I am not sure though since I must figure out a way to measure the ripple current in this test. | |
| Aug 21, 2013 at 2:02 | comment | added | Brian Wang | @ChrisL I would assume the 400V rated voltage for the capacitor is safe to use in 220VAC application. Or is it the even bigger voltage margin necessary? | |
| Aug 21, 2013 at 1:43 | history | edited | Brian Wang | CC BY-SA 3.0 |
Added the rectifier circuit diagram.
|
| Aug 20, 2013 at 23:43 | answer | added | Russell McMahon♦ | timeline score: 3 | |
| Aug 20, 2013 at 23:28 | answer | added | Jon Watte | timeline score: 0 | |
| Aug 20, 2013 at 19:24 | comment | added | Stephen Collings | Single-phase? Do you have any ripple current measurements? Is there a choke in the current path? | |
| Aug 20, 2013 at 15:32 | comment | added | user16324 | What reasoning leads to a ripple current rating of <2A in a 6A power supply? | |
| Aug 20, 2013 at 13:18 | comment | added | scld | Firstly, I would recommend a capacitor rated to at least 2x the VAC. | |
| Aug 20, 2013 at 9:40 | history | asked | Brian Wang | CC BY-SA 3.0 |