We all now that when it comes to perfection then sky is the limit but still one has to strive for perfection in order to keep competition at bay and for achieving new heights in growth. If we believe that, then looking at Apple we can feel that this Cupertino-based high-tech company always strives for perfection whether be it offering devices, packed with cutting edge technology or offering sophisticated device’s accessory and the best thing is that consumers don’t mind paying more for unique and extra- efficient accessories.
Look at Apple iPhone Charger which is so expensive, worth $30, yet it is grabbing attention and creating a place for itself. It is not only safe but at the same time it is extremely efficient.
Ken Shirriff is among those few curious techies who decided to find out, what lies beneath. After tearing down an Apple’s iPhone charger, he made some efforts to justify the expensive tag of an iPhone charger. He found that, in order to get the right output voltage, the iPhone charger turns the input power on and off approximately about 70,000 times a second. That’s seriously incredible. Isn’t it?
This expensive iPhone charger includes two circuit boards, which are about one inch square in size. The primary board which is placed on the top is capable of handling high voltage input circuitry and the board which is placed at the bottom, facilitates low voltage output circuitry.
Let see how Sheriff justifies the high-priced iPhone charger:
“Apple’s power adapter is clearly a high-quality power supply designed to produce carefully filtered power. Apple has obviously gone to extra effort to reduce EMI interference, probably to keep the charger from interfering with the touchscreen. When I opened the charger up, I expected to find a standard design, but I’ve compared the charger to the Samsung charger and several other high-quality industry designs, and Apple goes beyond these designs in several ways…
“Apple’s design provides extra safety in a few ways… the super-strong AC prongs, and the complex over-temperature / over-voltage shutdown circuit. Apple’s isolation distance between primary and secondary appears to go beyond the regulations…
“Apple’s iPhone charger crams a lot of technology into a small space. Apple went to extra effort to provide higher quality and safety than other name-brand chargers, but this quality comes at a high cost.”
And if you want to know some more deep technological details of this expensive iPhone charger, then this is how Sheriff tries to explain:
“The input AC is filtered thorugh a tiny ferrite ring on the plastic case (see photo below). The diode bridge output is filtered by two large capacitors and an inductor. Two other R-C snubbers filter the diode bridge, which I’ve only seen elsewhere in audio power supplies to prevent 60Hz hum;perhaps this enhances the iTunes listening experience. Other chargers I disassembled don’t use a ferrite ring and usually only a single filter capacitor. The primary circuit board has a grounded metal shield over the high-frequency components (see photo), which I haven’t seen elsewhere. The transformer includes a shield winding to absorb EMI. The output circuit uses three capacitors including two relatively expensive tantalum ones and an inductor for filtering, when many supplies just use one capacitor. The Y capacitor is usually omitted from other designs. The resonant clamp circuit is highly innovative.”
Well no wonder why sheriff got so impressed with this iPhone charger and after going through the significant details of this iPhone charger, I think every reader will be amazed at Apple’s quality oriented, reliable charger. We must thank Ken Sherriff, who rather than mere speculating on high-priced iPhone charger, went one step further in order to present his views backed with sufficient logics and findings and made us understand that why it is worth paying extra for this sophisticated iPhone charger.