Mobile phone universal charger circuit diagram explanation

Mobile phone universal charger circuit diagram (I)

Working principle: The circuit is mainly composed of oscillation circuit, charging circuit, voltage stabilization protection circuit, etc. Its input voltage is AC220V, 50/60Hz, 40mA, output voltage is DC4.2V, and output current is 150mA~180mA. Before charging, connect the battery to be charged and see if the test indicator on the charger panel is on. If it is on, it means the polarity is correct and you can connect the power supply to charge; otherwise, it means the polarity of the battery and the polarity of the charger output voltage are opposite. At this time, you need to press the polarity conversion switch AN1 (test key).

Mobile phone universal charger circuit diagram (II)

    The front stage of the circuit is a common RCC flyback circuit, and the back stage is automatic polarity control.

    CT3582 is a chip suitable for universal charging. CT3582 uses a dual-row dip package with a constant current output of 200mA.

    End voltage 4.25V, with end voltage fine-tuning device

    1 BTN battery negative terminal

    2 L3 indicator pin

    3 L2 indicator pin

    4 L1 indicator pin

    5 SEL function selection (connect to VDD for 3-light and 2-light mode, connect to GND for 7-color mode)

    6 GND

    7 BTP battery positive terminal

    8 VCC