With the popularity of mobile phones and the acceleration of high-application power consumption, people's pursuit of charging speed is getting faster and faster, and a variety of fast charging protocols have been derived, FCP, SCP, QC, AFC, PD, QC, VOOC, Dash, et al. The power of chargers for mobile phones has also changed from 0.5W many years ago to the highest 100W now. Ronghe Electronics has been developing various mobile phone chargers since 2009, such as PD fast charge charger compatible with various mobile phones, and popular QC fast charge. For car owners, a variety of multi-program car chargers. There is also a Qi-certified wireless charger, which provides a new charging method for mobile phones.