The charger is essentially a conversion device, and there is loss in the process, which is given off in the form of heat
Dec 13, 2022| The charger is essentially a conversion device, and there is loss in the process, which is given off in the form of heat. Chargers tend to draw more power from the socket than the charger says. Since Mi Rubik's Cube Converter Pro only supports the input of USB module: 200-240V~, 110V 60Hz cannot be tested normally during the test. The following figure shows the conversion efficiency test of 220V 50Hz. It can be seen that the conversion efficiency of the three voltage gears measured is between 88-90%.
Because the charger uses switching power supply, the transformer secondary output is not DC, need to go through the rectifier and capacitor filter output, that is, the charger output will have ripple, the lower the ripple, the higher the charger output quality. It can be seen that the value of no-load ripple at 220V 50Hz ranges from 40-48mVp-p. The load ripple values are between 74 and 101 MVP-p.
The charger is a conversion device, and there will be losses during the charging process, which will be emitted in the form of heat, so the charger will be hot. Mi Rubik's Cube converter Pro was placed in a 25℃ incubator with USB-C port loading for 1 hour, and the surface temperature of the charger was collected.
At 220V 50Hz, output at 12V2.5A for 1 hour. The surface temperature of the charger is as follows. In a 220V 50Hz mains environment, the limit load is 1 hour and the temperature is between 61 and 70℃.
