220V 48V DC battery charger principle: 220V AC input through the two-stage tube rectification and filtering to get 310V DC, chip 3842 output PWM signal control power tube turn-on time, through the high-frequency transformer primary winding in the iron core to form a pulsating magnetic field; The secondary output voltage of the high-frequency transformer is rectified to obtain 48V DC, and the output voltage is regulated by the operation amplifier and 431 voltage. The voltage and current feedback obtained in this way are photocoupled to control the pwm pulse width of 3842, stabilize the output of 48V DC voltage and control the size of the output charging current.
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The working principle of the charger is that the input of the charger is 220 AC, after the transformer of the charger, rectification, output a certain voltage and current of direct current, and then charge the battery