The chopped DC is fed into a flyback transformer which converts it into low voltage AC. The DC is switched on and off by a transistor controlled by a power supply controller IC. In more detail, the AC line power is first converted to high voltage DC by a diode bridge. Because of their design, switching power supplies are generally compact and efficient and generate little waste heat compared to simpler linear power supplies. The iPhone power adapter is a switching power supply, where the input power is switched on and off about 70,000 times a second in order to get the exact output voltage required. It simply takes AC input (anything between 100 and 240 volts) and produce 5 watts of smooth 5 volt power, but the circuit to do this is surprisingly complex and innovative. This article is now available in Vietnamese Bộ sạc iPhone của Apple.ĭisassembling Apple's diminutive inch-cube iPhone charger reveals a technologically advanced flyback switching power supply that goes beyond the typical charger.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |