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by coulomb
Fri Sep 21, 2018 4:11 am
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter
Replies: 215
Views: 7999

Re: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter

So with these non OEM fuses, does anyone think it would be doable to convert the fuses without screw terminals into fuses with screw terminals by soldering the fuse to some copper fashioned into screw terminals and soldering the fuse to the copper? I doubt it. Fuses are inherently thermal in nature...
by coulomb
Wed Sep 19, 2018 1:19 am
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter
Replies: 215
Views: 7999

Re: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter

From the "R" in the series name, I'm guessing that these use the X7R ceramic formula. These are among the worst for non-linearity and variation of characteristics with temperature. Hmmm. I take it back. From the Murata Capacitor Data Book , the R series (among two others) has a quite mode...
by coulomb
Tue Sep 18, 2018 11:34 pm
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter
Replies: 215
Views: 7999

Re: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter

Did anybody notice what the Murata data sheet says about these DEH series capacitors: ... Do not use these products in any automotive power train or safety equipment including battery charrgers for electric vehicles and plug-in hybrids. ... (My altered boldness) I think I did notice that in passing...
by coulomb
Tue Sep 18, 2018 11:27 pm
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter
Replies: 215
Views: 7999

Re: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter

Does anyone have suggestions on where to buy quality capacitors (I'm in the USA)? I'd try the "usual suspects": Mouser, Digi-Key, Newark. A quick search on eBay shows there are capacitors rated up to at least 40kV. I meant to say "in a similar sized package". Though I see that s...
by coulomb
Tue Sep 18, 2018 11:09 pm
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter
Replies: 215
Views: 7999

Re: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter

As for the fuse, would this work? https://au.rs-online.com/web/p/products/7686125/?grossPrice=Y&cm_mmc=AU-PLA-DS3A-_-google-_-PLA_AU_EN_Fuses_Sockets_And_Circuit_Breakers-_-Fuses%7CCartridge_Fuses-_-PRODUCT+GROUP&matchtype=&pla-392408123959&gclid=CjwKCAjwxILdBRBqEiwAHL2R83h1tofZAmpY...
by coulomb
Tue Sep 18, 2018 3:44 pm
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter
Replies: 215
Views: 7999

Re: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter

I"m struggling with the terminology in this thread -- vertical pcb (I don't see one), Your charrger doesn't have one. Some (roughly half?) of the chargers have a vertical PCB with surface mount capcitors on it instead of the two through-hole capacitors. dog house??? That's just the potted area...
by coulomb
Sat Sep 15, 2018 6:44 pm
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter
Replies: 215
Views: 7999

Re: Relay testing

i soldered some tiny wirewrap wires to the AC relay coil pins and measured 9.9R with relay off and 0.2R when closed. I assume that's neutral in to neutral out. So it seems the relay in jay's failed box is ok. It doesn't make a very solid sounding clunk or snap, but i guess you can't judge a relay b...
by coulomb
Thu Sep 13, 2018 6:16 am
Forum: EVSE (Charging Stations)
Topic: Charging from 48V DC
Replies: 4
Views: 135

Re: Charging from 48V DC

I wonder if you can connect 48 VDC directly to the L1 and L2 inputs of a J1772 connector. Yes, it's supposed to see AC, but there is a PFC (Power Factor Correction) stage that is capable of boosting say 48 V to the ~400 VDC needed for charging the battery. You can't have it running at full power; ev...
by coulomb
Thu Sep 13, 2018 6:03 am
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter
Replies: 215
Views: 7999

Re: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter

It looks like I've been able to successfully repair this second OBC that I have been working on. Wow! Two out of two, and not a semidonductor has died in either of them. Well done! https://www.smileysapp.com/gif-emoji/clapping.gif Kiev: I assume that when the doghouse capacitors blow, they are at l...
by coulomb
Tue Sep 11, 2018 8:02 pm
Forum: General / Main Owners Forum
Topic: And now my I will not charge!!
Replies: 42
Views: 2070

Re: And now my I will not fast charge!!

So its been a month and my new OBC is working well however I have tried two different fast chargers in the last week and neither would charge my car. ... I have not successfully fast charged my car since the new OBC was put in. I happened across this discussion about a Nissan Leaf charrger today: h...

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