Basic principle of mobile phone cable charger First of all, the transformer can reduce the power supply to a safe voltage for human body. Of course, the condition is to meet the demand. Secondly, after the full bridge rectification, we can get a slightly larger DC, so next we need to use the filter circuit, here we use 470uf electrolytic capacitor. Next, we need to use the potentiometer to achieve the purpose of voltage division, in order to supply a stable voltage to the three terminal voltage regulator, and we can also use the voltage regulator diode. The input end of the three terminal voltage regulator is connected to one end of the potentiometer, and the output end and the grounding end are connected to a three terminal adjustable voltage stabilizing circuit through resistance and potentiometer. Since then, our step-down, rectification, filtering, voltage divider and voltage stabilizing circuits have come to an end. Next, the base of the triode is connected to the output of the voltage regulator through a potentiometer, which is used to regulate the current, while the collector is connected to the input of the voltage regulator through resistance and indicator light, which is the display circuit. Finally, the transmitting stage is used as the output positive pole of the charger, and the ground wire is used as the output negative pole of the charger. In this way, even if our mobile phone charger is finished, the light will be on at the beginning of the charging process, indicating that it is in the charging state; When the battery is full, because the triode is cut off, the indicator is off, indicating that the charging is completed. This is the basic principle, after debugging to get accurate and stable function of outstanding lithium battery charger.
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