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by coulomb
Sat Dec 18, 2021 7:35 pm
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC)
Replies: 857
Views: 621784

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

10 W 4.7 Ohm then I max = 1.5 A, or U max = 6.9 V They actually will get up to ≈170 V briefly, so a massive overload: P = U²/R = 170²/4.7 = 7225 W, or a 723x overload! I suppose one should use RMS values, so that's 120²/4.7 = 3064 W = 306x overload. I would prefer to see a resistor with a high peak...
by coulomb
Thu Dec 16, 2021 6:05 am
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC)
Replies: 857
Views: 621784

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

The fuse in the glass bottle is a 20A, it might be too much. The fuse in the resistor is a thermal fuse. Obviously, it needs to be in thermal contact with the resistor element. I don't think that your fuse will protect much, but it should not do any harm. Fortunately, it should only be blocking AC;...
by coulomb
Sun Nov 21, 2021 5:29 pm
Forum: Instruments - Radio/USB/Nav - CAN - Climate Controls - Remote
Topic: EV-ECU Reverse Engineering
Replies: 5
Views: 14140

Re: EV-ECU Reverse Engineering

he found a datasheet for the 37xxx family used back in the '90s. I had a quick skim. It's a 16-bit CPU with 16 KiB of (mask programmable?) prom, A and B accumulators (16 bits), X and Y index registers (both 16-bit), and 16-bit S and PC registers. It sounds like a Motorola 6809, though quite possibl...
by coulomb
Sun Nov 21, 2021 4:53 pm
Forum: General Technical Discussions
Topic: MiEV, potential regen braking issue
Replies: 18
Views: 6961

Re: MiEV, potential regen braking issue

shamie wrote:Do you think that was enough to clean it out?

I would guess so. Contact cleaner is a solvent, as far as I know.
by coulomb
Mon Nov 15, 2021 7:22 pm
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC)
Replies: 857
Views: 621784

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

I still have same problem 4,7 Ohm resistor died again. ... What could be else wrong here? I assume that the relay signal must go through the ribbon cable. Those things can be cracked, or the connection at either end could be dodgy. Perhaps consider bypassing just the relay signal with a separate wi...
by coulomb
Mon Oct 04, 2021 7:10 am
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC)
Replies: 857
Views: 621784

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

Do you think it reasonable to assume that both capacitors (in parallel) were the same value? Yes, though it's obviously not necessarily the case. 47 nF is the closest preferred value to half of 100 nF, which designers seem to like for bypass capacitors. Also, why would you use two capacitors in par...
by coulomb
Sun Oct 03, 2021 3:24 pm
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC)
Replies: 857
Views: 621784

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

philsuth wrote:Haven't quite decided whether to try installing another cap to replace the cremated one or just to leave well enough alone.

I certainly would replace the capacitor. It may be assisting with suppressing of ringing, so leaving it out may stress the PFC MOSFETs, possibly leading to early failure.
by coulomb
Wed Sep 29, 2021 4:49 am
Forum: Modifications & Accessories
Topic: Socket replacement type 1 -> type 2
Replies: 2
Views: 2875

Re: Socket replacement type 1 -> type 2

The adaptor cables and adaptors are a pin-for-pin change with no electronics so as long as it can be made to physically fit, I can't see that it would be a problem Are you sure? It seems to me that the meaning of the proximity pilot changes with type 2; it specifies the maximum cable current carryi...
by coulomb
Sun Sep 19, 2021 11:58 pm
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC)
Replies: 857
Views: 621784

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

kiev wrote:... but hopefully there is a way to get thru and replace the diodes.

Or perhaps replace the diodes with a suitably rated and somehow heatsunk bridge rectifier. Assuming also of course that the shorted diode doesn't prevent the rest of it from working.
by coulomb
Wed Aug 11, 2021 1:23 am
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC)
Replies: 857
Views: 621784

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

By the way, do you happen to know either of these users, both from Western Australia? From the first page of this topic. 17. skylogger#2, 9/2018, 2010 in Western Australia , blown snubber caps and MCU fuse, AC relay and precharge Rs [EDIT: REPAIRED--SUCCESS!, 9/2018 ] 13. skylogger, not charging in ...

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