Multifunctional alternating current charging device

The utility model discloses a multifunctional alternating-current charging device, which comprises an alternating-current charging pile connected with a power grid side, a vehicle interface and an electric vehicle, and the alternating-current charging pile is connected with the electric vehicle through the vehicle interface. The alternating current charging pile comprises a switch K1, a switch K2, a switch K21, a switch K3, a switch K31, a switch K4, a switch S1, a resistor R1, a resistor R4, a resistor R5, a triode Q1 and a power supply device, by the adoption of the technical scheme, control guiding and awakening functions of the electric automobile are achieved, real-time data of a power grid are transmitted to the power supply device through the Ethernet, and the power supply device is connected with the alternating current charging pile. According to the real-time load condition of the power grid, the power supply device adjusts the size of output current by adjusting the size of the duty ratio of PWM so