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by coulomb
Tue Jun 19, 2018 5:36 am
Forum: General Technical Discussions
Topic: Car not charging,..DC/DC converter failure. not what we expected.
Replies: 16
Views: 590

Re: Car not charging,..DC/DC converter failure. not what we expected.

Kiev, the charger block diagram is almost the same as for the Elcon EV chargers, except: * The PFC transistor is a pair of PFC MOSFETs in the Elcons * The Elcons' switching devices are MOSFETs, not IGBTs I didn't realise that the DC-DC was in a separate compartment. I assumed that one transformer wa...
by coulomb
Mon Jun 18, 2018 5:12 pm
Forum: General Technical Discussions
Topic: Car not charging,..DC/DC converter failure. not what we expected.
Replies: 16
Views: 590

Re: Car not charging,..DC/DC converter failure. not what we expected.

It may be repairable yet. True. But unfortunately after a massive transient like that, blowing some parts to soot, it's likely that there is damage to other parts of the circuit. As with the soot, I guess it could be HV discharge, but the only thing it would have discharge to was the relay next to ...
by coulomb
Tue Jun 12, 2018 5:33 am
Forum: General Technical Discussions
Topic: Car not charging,..DC/DC converter failure. not what we expected.
Replies: 16
Views: 590

Re: Car not charging,..DC/DC converter failure. not what we expected.

Howdy Mike, welcome to the miev forum. Hi. I may be starting an interest in iMievs, for a colleague. I was thinking those blue caps were like the 2 Y caps of an EMI filter such as this: ... and it read: HR R 102k Yes, that clinches it. Now I'm thinking that electronpusher's "resistors" ma...
by coulomb
Sun Jun 10, 2018 8:50 pm
Forum: General Technical Discussions
Topic: Car not charging,..DC/DC converter failure. not what we expected.
Replies: 16
Views: 590

Re: Car not charging,..DC/DC converter failure. not what we expected.

Maybe there is a board buried under where the two blue caps are sticking up? Actually, those "caps" are a slightly different blue to the others. I suspect that these are NTCs (negative temperature coefficient resistors), which are often used for soft starting / pre-charge. Their resistanc...

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