BMS-Battery 900 watt charger failure

[alex77roma]

I have the 900 watt battery chargers bought from bms battery about an year ago, setted to 96 volt 7 ampere.
The charger was working fine, but suddently decided to don't work more without outbreak or smoke.
Internally it is all in order, with no trace of burn.
Now if I mesure the otuput voltage I read about only 11 volt.
Has anyone had a similar problem? Any solutions?
Has this type of charger a protection diode?
Is there a chance to repair it?

 

[jameswalker]

Mine just died now too... though the transformer went up in smoke...
There is no way to determine the part number, so it is terminal. Time to get a new charger...

 

[dnmun]

are both of you talking about the EMC-1000 charger?

do you know how to open the chargers and take a picture inside? i doubt if the transformer died but the IGBTs that are used for the switching transistors may have shorted. or the schottky diodes on the output.

 

[alsmith]

There are quite a few threads about repairing these chargers, don't give up until you've looked inside. Repairs can be very inexpensive- mine (lower wattage) was repaired for nothing but a bit of time and effort.
And you've got an offer of help from dnmun- what have you got to lose? Even if you order a new one you could end up with a spare one ready for the next breakdown....

 

[dnmun]

yep, i have parts and i actually think the EMC-1000 is the best charger they sell for the money. it is the smaller chargers that usually die. you can buy the IGBTs on ebay for $4 plus $4 shipping on the first and $.10 on the second.

 

[jameswalker]

Yes I am sure, it was the smaller transformer that died. Not the IGBT's. It used to have a yellow plastic protective casing around it, it is now black and charred.

It failed previously by the inductor having a bad solder connection, causing a few sparks so I simply resoldered that. 30 charges later, the transformer has gone pop. It is the secondary transformer rather than the primary mains transformer. I have no idea what its windings are therefore cannot buy a replacement.

 

[Mic]

...
Edit:
Problem solved - thanks!