apple inc in 2012 case study solution - An Overview
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Internally a charger is undoubtedly an surprisingly compact switching electricity offer that successfully converts line AC into five volt DC output. The input AC is first transformed to substantial-voltage DC. The DC is chopped up tens of A huge number of moments a next and fed into a little flyback transformer. The output of your transformer is transformed to reduced-voltage DC, filtered, and offered as the 5 volt output through the USB port.
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The graphs ended up produced utilizing the X-Y manner over the oscilloscope, Along with the load voltage as Y and the current as X. I made use of a .twelveΩ present perception resistor to measure the load present.
As for offering 1A: Once i measured the charger, it didn't supply 1A but shut down cleanly well just before there.
But a powersupply may be meant to give say one.1A constant recent at powerup, and switch to constant-voltage mode the moment 5V is attained. From then on it is going to shutdown when one.2A is touched...
On Oct 2, 2012, Samsung appealed the decision to The us Court docket of Appeals with the Federal Circuit, requesting that Apple's victory be thrown out, declaring which the foreman of your jury had not disclosed that he were sued by Seagate Technology Inc., his previous employer, and which has a strategic romance with Samsung, Inspite of getting been questioned link for the duration of jury selection if he had been involved with lawsuits.
A more complicated dynamic load circuit is explained below, but The easy circuit was enough for me.
My guess may be the voltage sag is intentional and really helps to decrease the energy dissipated within the wall charger by itself. There isn't a need to maintain just 5V with the charger output in the event the battery is in a small charger level.
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The desk beneath displays the sort of charger, the current which the label statements the charger gives, The existing it in fact presents, and the charger sort it indicates to your device.
Hey Ken - this was super enlightening and I planned to thanks for it. A charger is just a few ordinary, every single day piece of technological know-how that folks pay back little to no awareness to in the least but when you've discovered, they're not made equivalent and fluctuate wildly with regards to general performance.
Since HTC is doing properly with their telephones lately, Why don't you overview it. A teardown might be nice way too. Oh, and the Apple MagSafe chargers also!
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