Application of fast charging technology in smart phones

The application of fast charging technology in smart phones In the past two years, the size, screen resolution and mobile processor (AP) speed of the new generation of smart phones have increased, all of which require larger lithium batteries. Although both Qualcomm and MediaTek have announced their own fast charging methods, the charging methods of the two companies are quite different. The following are their charging principles and solutions for fast charging plans. Qualcomm's Quick Charge 2.0 Qualcomm snapdragon800 chip was launched in 2013. It contains the QuickCharge 2.0 version of the channel. The working principle is briefly described by the device through the USB data communication port D+/D-, the output voltage signal charger, charging The device has a built-in USB input decoder chip, and the output voltage of the charger is required. Although the output current of fast charging is limited to less than 1.8a, there are three options for output voltage: 5V, 9V, and 12V. The rated power of the new QC2.0 standard fast charger is 15W, which is 2-3 times that of an ordinary 5V USB charger. This is a fast charger developed in cooperation with Qualcomm's QC2.0 standard. The method is selected as the decoding chip iW620 that conforms to the Qualcomm QC2.0 protocol and the primary-side PWMIC chip iW1760 developed by Dialogue. The application of fast charging technology in smart phones iW620 is a sot-123USB decoder IC. The IC reads the required information from the USB data communication port D+/D-read, and then ICDRV drives the signal to output with different currents (2mA~10mA) To the LED of the photocoupler, control different output voltages (5V/9V/12V). The signal is reflected by the optical coupler to the primary power processing chip iW1760. iW1760 is a digitally controlled power processing chip, which performs output voltage and current on one control twice. Application of fast charging technology in smart phones The iW1760 is a real-time waveform analyzer. It reads the voltage waveform of the VSENSE pin in a periodic manner, and then generates a response voltage VFB, which is exactly equal to the output voltage in most cases. Used to adjust the output voltage. MediaTek’s Pump Express MediaTek announced a new SOC processor MT6630 in February this year, equipped with a new fast charging technology PumpExpress. PMIC's power processing integrated circuit has built-in pump speed technology. Features: Allow the charger to determine the initial voltage required for charging based on the current. PMIC announced that the pulse current command is transmitted to the charger via USBVbus. The charger adjusts the output voltage according to this manual and gradually increases to 5V to reach the maximum charging current. The application of fast charging technology in smartphones MediaTek now has two fast charging standards: (1) The output power of the pump expresses the fast charger. The DC power supply is less than 10w (5V), and the control output voltage: 4.8V/5V/4.6V/4.4 V/4.2V/3.8V/3.6V, 4.0V/important output power: 5V/1 and 5V/1.5A (2) pump expression + supplied charger output power is greater than 15w, the difference in control output voltage is added 12V , 9V and 7 three gears, 9 to 12V/V/7V/5V/4.8V/4.6V/4.4V/4.2V/4.0V/3.8V/3.6V. 3 Conclusion In 2014, due to the planning changes involving the entire charger system promoted by Qualcomm and Mediatek, the new demand for fast charging applications has become an important variable that promotes the reshuffle of the smartphone charger industry. In the planning of fast chargers, whether it is the reduction of planning costs or the improvement of reliability, there are more new topics worthy of discussion. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: The difference between UPS power supply, diesel generator and EPS power supply