vcfan Posted July 15, 2013 Share Posted July 15, 2013 ive also cracked open apple chargers,and the design is very safe,it isn't a design issue at all. my theory is that a component,such as a resistor popped off inside,and shorted the 2 ends. Link to comment Share on other sites More sharing options...
neufuse Veteran Posted July 15, 2013 Veteran Share Posted July 15, 2013 You do realise that using a phone while its charging damages the battery, that is why the cables are so short. uh no... they have switching circuits when a phone is plugged in the charger uses transistors to switch current flow so it can charge the battery and simultaneously NOT use the battery for phone operation... the second the cord is pulled that gate switches back instantly to battery power... hence why you can do what you do... this circuit also senses the switch, hence why the phone knows its on AC or Battery, and switches on another sensor circuit that senses the charge... it's a pretty simple concept if you look at the schematics for it Link to comment Share on other sites More sharing options...
The_Decryptor Veteran Posted July 16, 2013 Veteran Share Posted July 16, 2013 ive also cracked open apple chargers,and the design is very safe,it isn't a design issue at all. my theory is that a component,such as a resistor popped off inside,and shorted the 2 ends. Or she had a knock off charger, some of those are scary as well. She was also in the shower at the time and stepped out to answer it, so that would definitely affect it. vcfan 1 Share Link to comment Share on other sites More sharing options...
FaiKee Posted July 16, 2013 Author Share Posted July 16, 2013 The Chinese Police had a preliminary inspection of the charger and wire and found that it's in intact and working condition. I guess they want to wait for Apple tech guys to open up the phone, so Apple couldn't say a 3rd party had tempered with it and try to get away. iphones have integrated batteries, and the girl's family said it was bought last year, unlikely there is a home-made battery that caused the accident. Apple's only hope is if they found the phone had been "repaired" by a unauthorized shop. Link to comment Share on other sites More sharing options...
Shiranui Posted July 16, 2013 Share Posted July 16, 2013 Saw this on the news. Probably a dodgy Chinese-made third-party charger, but even so, I don't see how the case could have become live, especially not with the 220V mains voltage rather than the 5 or so from the charger. Anyway, I have received 240V shocks from the mains on 4 occasions in my life -- the first being when I was about 3 years old -- and I have survived each time. I must be immortal. Link to comment Share on other sites More sharing options...
The_Decryptor Veteran Posted July 16, 2013 Veteran Share Posted July 16, 2013 From the front page article on this subject. That's not an Apple charger, that's a knock off. If that's the real charger she was using then it's not Apple's fault (Even though it already wasn't) Link to comment Share on other sites More sharing options...
FaiKee Posted July 16, 2013 Author Share Posted July 16, 2013 From the front page article on this subject. *** snip **** That's not an Apple charger, that's a knock off. If that's the real charger she was using then it's not Apple's fault (Even though it already wasn't) Yes you are right, when the video came out , many people already pointed out that it's not the charger provided by Apple China stores, so the story now goes into a interesting turn. :) Link to comment Share on other sites More sharing options...
vcfan Posted July 16, 2013 Share Posted July 16, 2013 I made a little mspaint block diagram of the apple charger pretty standard design, but the isolation boundary is adequate. it prevents arcing,and components shorting. the cheap chargers ive seen have like either 1/6 the isolation boundary compared to apple,samsung,etc. or no boundary at all. hell I've seen chargers not even use a transformer,just some resistors,caps and some diodes. the UL or certification markings are mostly fake. im surprised we're not hearing more of these incidents,because these knockoff chargers can be had for only a dollar on ebay,and they sell a ton of them. The_Decryptor, FaiKee and Shiranui 3 Share Link to comment Share on other sites More sharing options...
FaiKee Posted July 16, 2013 Author Share Posted July 16, 2013 I made a little mspaint block diagram of the apple charger ** snip ** pretty standard design, but the isolation boundary is adequate. it prevents arcing,and components shorting. the cheap chargers ive seen have like either 1/6 the isolation boundary compared to apple,samsung,etc. or no boundary at all. hell I've seen chargers not even use a transformer,just some resistors,caps and some diodes. the UL or certification markings are mostly fake. im surprised we're not hearing more of these incidents,because these knockoff chargers can be had for only a dollar on ebay,and they sell a ton of them. Tks for the detail chart, but one question: transformer only works on a/c, should the rectifier be after step down? Link to comment Share on other sites More sharing options...
vcfan Posted July 16, 2013 Share Posted July 16, 2013 Tks for the detail chart, but one question: transformer only works on a/c, should the rectifier be after step down? the transformer control circuit does switching on the dc supply at the input,so it turns it basically into ac. And I simplified the diagram, but the ac is rectified with a diode at the output to give dc Link to comment Share on other sites More sharing options...
Recommended Posts