Safety Y capacitor for escort charger

Not long ago, a piece of news was raging. When Ms. Yang of Jinhua City, Zhejiang Province charged her iPhone, she found that the phone actually operated, jumped between different apps, and then booked a presidential suite. At that time, all kinds of remarks were flying, such as what hackers invaded the charger, chargers implanted Trojans, etc. In fact, things are not so complicated.

After disassembling the charger, I found that this kind of imagination is only because of a small safety Y capacitor. The quality of the safety Y capacitor in this charger is not good, the filtering effect is invalid, and the ion is on the screen of the mobile phone. On the chaos, it happened to be a presidential suite. The culprit of this incident is such a safety capacitor.

Filtering effect: In the power supply circuit, the rectifier circuit turns the alternating current into a pulsating direct current, and after the rectifier circuit is connected to a larger capacity capacitor, the rectified pulsating DC voltage becomes relatively stable by using its charging and discharging characteristics. DC voltage. In practice, in order to prevent the supply voltage of each part of the circuit from changing due to load changes, there are typically tens to hundreds of microfarads of capacitance at the output of the power supply and the power input of the load.