Use the data to speak the ipad charger charging IPhone4

Is this microblogging a help or a rumor? Today we measured. The picture is a harbinger of rumors on the web, and the microblog was also used in an interview with Apple technicians to call it a start. The reality: The 10W adapter's product description in the Apple online store specifically mentions it can be used on iphones and ipods. Since the ipod has a smaller battery capacity, and the current should be smaller than the iphone, how can the 10-watt charger be charged to other devices? Preparing these devices is not a problem, the editorial department can find 10 pairs of children. We first use iPhone4 charger respectively to IPhone4 and iPad2 charge, to see how the input power consumption, you do not have to divide this number by 5 to get the current, because this is the power consumption of the input, also need to pass through the voltage conversion output, which will generate heat. Next we use iPad2 charger respectively to IPhone4 and iPad2 charge, the key is this one, no matter which charger to charge for iPhone4, power consumption is almost. In other words, when using iPad2 to charge iPhone4, the output certainly does not reach 2.1A of current. The actual charge is about 1 a charge. The actual test results show that using the ipad charger to charge the iPhone4 will not shorten the actual, because the electricity supply is almost the same. On the next page, let's briefly explain why purple. The left and right two pins are powered by the positive and negative poles, needless to say, to the Apple device when charging will give the charger a recognition signal is the data is this pin provided, The iphone and ipod provide a 2.0V voltage signal on this pin, while the ipad provides a 2.7V voltage signal that the charger is limiting the output current with this voltage signal. So iPhone4 plug in the ipad charger will only output 1 A of the current charge. And to charge the Apple device also requires the data is the pin to signal, but simply put the power supply and negative connection is not charged, which I found in my experiment, this and some Android phones are similar. Conclusion: Charging IPhone4 with an ipad charger will not damage the battery or damage the cell phone, rumors are circulating online. Add: See some netizens in the article comment, I add the use of IPhone4 charger for the ipad charging line not. The conclusion is yes, just a little slow, but it can also be filled. Reason can see the picture. For the action of charging the lithium battery directly, there are some restrictions on whether it can be filled in. The charging current must be higher than a certain value to be able to, otherwise has been a very small current to the lithium battery charge, full day also cannot fill. But for lithium-ion batteries in the ipad, the 10-watt charger or USB port is not charged directly to the battery, because there is also a voltage-switching circuit between the charger and the battery. Mature lithium battery charge IC used in the circuit, such as MCP73855 or TP4056 and so on. They are responsible for stabilizing the charge voltage between 4.2V plus and minus 0.04V. At this time the input voltage conditions are relatively broad, such as from the 3.7v-7v. So there is not much limit to the voltage when charging the ipad. The current also needs to reach a certain threshold when it is charged, such as the ipad's battery is about 300mA above the current, no matter how long it takes to recharge the electricity. If the voltage or current at the time of charging is any one that falls in the orange area of the image, then the ipad cannot be recharged. However, the USB port and iPhone4 charger from the voltage and current to see more than the secondary area, so the charge will not be a problem. Another argument is full of dissatisfaction, the actual situation is not the case, because the lithium battery charge in the late (fast full time), charging current will drop to 0.1C (c is the battery capacity, such as 1000mAH battery, 1C is 1000mA), and then slowly reduced to the degree of 0.01C. Both the iphone charger and the ipad charger offer the same size of current. So it can be filled.