Lixin Technology MB Marketing Project Manager He Xinlong share, despite the efforts of the industry are to increase the wireless charging watts to speed up the charging speed, but security is still the most important consideration.Recently, Apple (iOS) released the iOS 11.2 operation Although the system can support 7.5W power, however, charging at room temperature for more than 16 minutes, the phone temperature began to rise, still need to reduce the charging current to reduce the temperature of the cell phone.From the current technological trends, the speed of wireless charging is still impossible to exceed the cable charging, Receiving device overheating is also a big problem.
However, the problem of equipment heating can be physically alleviated by high voltage and low current.He Xinlong further explained that the biggest side effect of pulling up the charging wattage is to generate heat, and the heat problem is caused by the impedance of the coil. To solve the thermal issue at the receiving end of the WPC Qi specification, the future trend is to pull up the voltage and reduce the current.
In addition to increasing the cost of components, the high voltage and the low current will also cause the voltage drop to increase, which will further reduce the efficiency of the charging IC. Therefore, He Xinlong pointed out that the optimization and systematic integration of the related charging and power control ICs , Will be the next major challenge for wireless charging in smart phone rollout, and to further increase charging speed and reduce heat generation, there must be a greater degree of integration between components.