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I just acquired a $2 counterfeit that looks precisely identical to the legitimate iPhone charger proven in the report...
Hi AaronX. I calculated the charging current two strategies. I set a multimeter from the output circuit to acquire a straightforward current measurement. To the voltage/present-day graphs, I set a "existing feeling" resistor (a fraction of the ohm) while in the output circuit and measured the voltage across it with an oscilloscope.
The HP charger is the exact same given that the the charger that came Together with the Palm Pre prior to HP purchased Palm. Never ever realized the prongs twisted off right up until I go through your post
These chargers cram a great deal of elaborate circuitry into a small offer, as you can see through the apple iphone charger below. (See my apple iphone charger teardown for more specifics.)
T_Beermonster: I plugged the bogus United kingdom charger into 120V from the adapter pointed out previously mentioned, which doesn't modify the power in any respect, so It truly is just 120V 60Hz in the fake United kingdom charger.
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Hey Ken - this was super instructive And that i wanted to thanks for it. A charger is just some normal, every day piece of technology that men and women fork out small to no interest to in any way but while you've learned, they don't seem to be developed equal and vary wildly with regard to general performance.
Measuring these curves was a bit difficult. I employed a NTE2382 electric power MOSFET transistor being a variable load, manually varying the gate bias to make the load curve. The transistor wanted a large heat sink to dissipate ten watts.
I have already been working with what seems like your Orange UK counterfeit charger to push dwelling-created pictorial illuminations produced with christmas gentle chains.
The next rating is Latest Sag, which displays how The present fluctuates as load increases. Last but not least, Regulation shows the general balance of the output with the charger.
I not long ago calculated a charger which was drawing (multimeter-examined) 0.56A at 5V once the controller was driven up and all the light-chains within the illumination have been lighted. I was consequently pleased to deliver 1 absent being fitted at a colleague's house.
Excellent article. Please review much more chargers, like the Amazon Kindle PowerFast. Also, it would be very good to grasp the Android condition, where by I fully grasp the info pins have to be shorted alongside one another within the charger or cable (?) or Android phones only cost at 500ma.
The end result is a wide variation in the standard of the chargers, a lot of which is invisible to the consumer, who could consider "a charger is really a charger".
As for furnishing 1A: After i measured the charger, it did not offer 1A but shut down cleanly well before there.