Electric car charger, we generally use the charger to make the charger use longer. The principle of electric car chargers is to understand so that the electric car charger can be used for a more extended period. And want to understand the electric car charger, we look at its characteristics.

　　They are charging principle analysis.

　　1. Maintenance charging.

　　When the battery voltage is low (can be set, the circuit is preset at 9V or less), the charger works in small-current maintenance charging state, and the working principle of U1C ⑨ feet (in-phase terminal) potential is lower than ⑧ feet (in-phase terminal), U1C output low potential, T4 cutoff. U1D 11 feet potential of about 0.18V. At this time, the charging current is about 250mA (constant current circuit by R14, U1D, T1B peripheral circuit. The steady recent course comprises R14, U1D, T1B peripheral circuits, regular contemporary principle readers should analyze by themselves). 

　　2. Voltage limit float charging.

　　When the battery is nearly fully charged, the charger automatically turns into the voltage limit float state (voltage limit float voltage is set to 13.8V, such as 6V battery, the float voltage should be set to 6.9V), the charging current at this time will gradually decline from the fast charging state to the battery is fully charged, the charging current is only 10 ~ 30mA, to supplement the battery lost due to self-discharge.

　　3. Fast charging.

　　As maintenance charging continues, the battery voltage gradually rises. When the battery voltage exceeds 9V, the charger turns into high-current fast charging mode, U1C ⑨ pin (in-phase terminal) potential is higher than ⑧ pin (inverted terminal), U1C output high potential, T4 conduction, U1D 11 pin potential is about 0.48V, the standard charger output about 1A current to charge the battery.

　　4. Protection and charging indication circuit.

　　This circuit has a reverse polarity protection circuit consisting of D4, U1C, U1D, T1, and peripheral components. When the battery is reversed, the charger limits the output current to avoid accidents. The charging indication is composed of U1A, D7, and peripheral components. When charging, D7 lights up, and when the charger enters the floating state, D7 goes out, indicating the end of charging.

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