Can the socket for charging be compared with the charger that comes with the mobile phone?

With the popularity of various digital products, there are now one or two USB charging sockets on many household power sockets, which can directly convert 220V AC voltage into 5V DC voltage, which is very convenient for charging mobile phones and Bluetooth speakers. And you don't have to look everywhere for a charger anymore. So what is the quality of the USB charging port on this socket compared with the mobile phone charger?

This power socket with USB charging port has an isolated AC DC module, which directly converts 220V AC voltage into 5V DC voltage to charge mobile phones and other equipment. The principle is the same as that of mobile phone charger, but the quality of AC -DC conversion circuit of some sockets is not as good as that of mobile phone charger. If the charging current is slightly larger, it may generate heat and reduce the output voltage, thus slowing down the charging speed. The above picture shows the output voltage of a USB charging port on the power socket measured by USB voltmeter. When it is empty, the measured output voltage is 4.97V V V. ..

The AC DC circuit module in this power socket with USB is usually directly connected to the AC 220V circuit. As long as there is 220V AC voltage on the socket, the AC -DC conversion circuit will always be in working state, which is equivalent to that the mobile phone charger is always plugged into the power socket. Although it is empty, it still consumes a certain amount of electricity, and long-term electrification is not good for components on the AC -DC conversion module. Although some sockets are equipped with a USB switch (as shown in the above figure), when the switch is pressed, the USB charging port will have a voltage of 5V, but this switch generally controls the on-off of the USB charging port and will not cut off the 220V AC voltage at the input end of the AC -DC conversion circuit.

To sum up, the USB charging port above this power socket is slightly inferior to the mobile phone charger in terms of load capacity, charging speed, power saving and safety.