With the trend of mobile devices moving toward multi-core, large screen, and ultra-thin, the consumption of mobile devices is accelerating. Users want mobile devices to charge faster, generate less heat, and charge mobile devices anytime, anywhere. Clearly, fast charging and wireless charging technology are the ideal solution to this problem.
Texas Instruments (TI) announced the introduction of a new lithium-ion battery charger integrated circuit (IC) that reduces the charging time of smartphones and tablets by half compared to other charger solutions. The bq2419x family of rated 4.5A output, 20V input switch mode chargers with I2C interface and USB mobile (OTG) support for mobile power and power packs, 4G LTE routers, Wi-Fi speakers, portable medical and industrial designs Applications enable faster, lower temperature charging.
Consumers hope that the battery charging speed of portable electronic products will continue to increase. The new design requires a higher precision, more efficient charging circuit to ensure that the system operates safely at low temperatures while charging at a faster rate. TI's latest bq24190, bq24192, bq24192i, bq24193, bq24195, bq24195L and bq24196 fast charging circuits not only shorten the charging time through battery path impedance compensation, but also provide programmable thermal management to ensure the most reliable and reliable system operation. After several months of charging and discharging, the battery of the machine has a long period of continuous working time, which makes the mobile phone users feel troubled. 
(Figure can be enlarged)
Circuit Theory: This reference design is a programmable single-chip IC solution for fast nickel-cadmium (NiCd), nickel-hydrogen (NiMH) or lithium-ion (Li-Ion) cells in single or multi-chemical applications. Charge management. It will use the appropriate battery chemistry (nickel or lithium) and perform the operation using the best charging and termination algorithms. This process eliminates poor charging, undercharging or overcharging and ensures fast charging accuracy and safe termination.
Circuit characteristics series battery number: 1S to 25S
Maximum input voltage: 25V
Maximum charging current: 1A
Topology: Switch mode battery capacity is increasing overall, so charging with a larger current can achieve the same charging rate as before, but this will shorten the battery life. Yu Ming, market development manager of Texas Instruments Battery Power Management Solution, said that TI combines a fuel gauge with a charging IC, uses a fuel gauge to control the charging IC, and uses impedance tracking technology to obtain the battery aging degree, internal temperature and various full Charge the situation. On this basis, some control of the charging IC can be performed to optimize the setting of the charging voltage and the charging current.
Review analysis:
When the charging current exceeds the optimal and safe charging range that the battery can withstand, it will cause some lithium deposition inside the battery. On the electrode and the isolation film, this lithium precipitation is irreversible, which can be seen in the internal resistance of the battery. The internal resistance of the battery increases sharply, which means that the voltage will quickly reach the full charge voltage when charging with the same current, but it will be quickly discharged when it is discharged. I originally needed a battery with 8 hours of battery life, but it was charged by a large current. After aging, the battery may be out of power for two or three hours, and the battery life is greatly affected. At this stage, wireless charging is a two-dimensional degree of freedom, not charging in a three-dimensional range; the maximum power limited by the charging standard is 5 watts; charging is one-to-one matching and only supports one-way communication. In the future, the power of wireless charging technology is not limited to 5 watts. After the standard of 15 watts comes out, mobile phone applications can be extended to flat and even super-applications; one-to-many pairing can be realized by loose coupling technology to supply more devices at the same time; Two-way communication is also possible between the transmitting end and the receiving end.
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