The Charger Is Essentially A Conversion Device.

The charger is essentially a conversion device. There is loss in the process, which is dissipated in the form of heat. The power that the charger draws from the socket is often greater than the parameters labeled on the charger. Below is the conversion efficiency of CukTech 65W ultra-thin charger in two types of mains environment; The output efficiency of 20V voltage range in the two types of mains environment is different, so the data is different. The conversion efficiency of the six voltage gears measured is the highest at 15V3A voltage gear at 220V 50Hz, and the conversion efficiency is 93.83%. The lowest conversion efficiency is 5V3A at 110V and 60Hz, and the conversion efficiency is 86.01%. Ripple is a phenomenon caused by the voltage fluctuation of the DC stable power supply, because the DC stable power supply is generally formed by the AC power supply through the rectifier voltage regulation and other links; Due to the switching power supply used in the charger, the secondary output of the transformer is not DC, which needs to be output by rectification and capacitor filtering, that is, there will be ripple in the output of the charger. The charging head network uses oscilloscope to test the output ripple value of the charger, and compares it with the national standard to test the output quality of the charger. The lower the ripple, the higher the quality of the charger's output. It can be seen that under the two voltage environments, the highest ripple is 15V0A at 220V 50Hz, with a value of 69.5mVp-p. The lowest ripple is 5V0A at 220V 50Hz, and the value is 40.1mVp-p.