Several Basic Circuit Protections Of PD Power Adapter

The PD power adapter converts 220V AC power into DC power suitable for electrical equipment. It is generally composed of housings, transformers, inductors, capacitors, control ICs, PCB boards and other components. It is widely used in mobile phones, laptops, cameras, set-top boxes, and routers. and other electronic equipment. Because it is connected to 220V household electricity, manufacturers generally set the most basic four protection circuits inside the circuit for the safety and stability of use.
1. Short circuit protection: With short circuit protection, the power adapter can withstand the impact of large current caused by short circuit. When the fault disappears, the adapter can recover from protection mode and provide rated power again.
2. Overvoltage protection: When the loop is damaged, such as the optocoupler is damaged or the TL431 voltage divider network is affected, the adapter must stop working immediately and remain in this state until the user restarts the adapter.
3. Over-temperature protection: When the power adapter converts 220V AC into DC, part of the power will be consumed and dissipated through the air in the form of heat. If the heat is too late to dissipate, and accumulate to a certain amount, the temperature exceeds a certain temperature. value, the adapter will be destroyed. Therefore, a thermal sensor is installed in the general power adapter to monitor the temperature, and when the temperature exceeds the limit value set by the designer, the adapter will automatically power off. When the user cycles the power and the temperature drops, the adapter resets.
4. Over-power protection: For some power supplies, it is important that under the worst conditions - such as the current consumed by the load is too large, the maximum output current is kept in a controlled state, and there will be no actual short circuit, the UE power supply will can do it.