contactless charger/qi standard cable charger

The rapid development of communication skills promotes a variety of mobile phones, and also leads to a variety of mobile phone chargers. The brief operation process of the charger is as follows: the input voltage is reduced by the capacitor, and then becomes DC after rectification by the diode rectifier bridge. The mobile phone is charged by the barrier diode and the filter capacitor. With the increase of charging time, the voltage at both ends of the battery also increases. The voltage is introduced into the reference voltage comparator through the voltage regulator, and three comparators are equipped with three indicator lights, When the three lights are all on, it indicates that the charging is full. Through the above work process description, contact life experience, design mobile phone universal charger circuit. Skill requirements: be able to charge the lithium battery smoothly, with necessary display and maintenance functions. The charging voltage is 4.2V and the charging constraint voltage is 4.5V.