Help I killed my King Power charger

[patrickza]

I usually switch on my charger before I plug in to the bike, it avoids the big spark because the voltages are much closer. Sometimes I forget, last night was one of those times. I plugged the charger into the bike, got the big spak so I knew I forgot to turn it on, turn it on and it ran for about 20 seconds then started pulsing on and off. Was weird, it's never done that before. Picked up the case and it was very very hot. Turned off for a while until cool, turned on again and it ran normally for 20s again and then did it's pulse trick and was very warm. Let me post some pics and I'll carry on.

Inside of the charger. Last night that copper coily thing (I'm using the technical terms) was seriously hot. as well as the side the yellow wire leads to, and it would just pulse.

Today there's no light on the charger, the coil doesn't really heat up, the only thing that does is the FET I'm pointing to with the thermometer. I haven't had a chance to lift the circiut board yet, will try soon and see if I can get more pics. The fuse is fine, no problems there.

Anything else I should look for besides burnt components?

 

[dnmun]

measure voltage from the back end forward if it will still run. look for a voltage drop across the schottky diode that holds the charge in the back end. it has the three legs with the two outside legs tied to the same trace, usually. i have never opened mine.

 

[patrickza]

Haha it's all a little moot now I'm afraid, probe slipped huge bang all power tripped. If it was salvageable before it definitely isn't anymore! I'll get hold of ecitypower and order a new one.

Using my headway charger in the meantime. Not a great charger though, gets to 88.2v and then just drops the charge, doesn't leave much time for any balancing to happen. Doesn't qualify as a CC/CV charger to me.

 

[auraslip]

I actually blew mine up the other day. What happened was I trying to turn down the voltage so I could run my ping pack with out bms via the internal pot that controls voltage, but I over did it and the voltage was too high. This blew out a capacitor. I replaced the cap with a 100v model, but now I can only get the charger to put out 110v.

Related - these are not king power chargers. They are made be king pan.
http://kingpan.en.alibaba.com/product/344738034-209782657/productdetail.html

If anyone wants, I'm thinking of doing a group buy of these.