The Design And Research Of EVs AC Charging Spot

Electric vehicle AC charging spots are the most common charging infrastructures andthe premise for achieving the industrialization and marketization of electric vehicles.Electric vehicle AC charging spot is the device with standard charging interface that adoptsthe conduction method of charging to supply power for electric vehicles and generally hasthe functions of energy metering, billing, communications and control safety.AC chargingspot commonly can be installed in the parking and residential area with safety protection,and is also the main equipment for the Electric vehicles in conventional charging mode.This paper discusses a kind of AC charging spot that based on special electricalenergy measurement chip and scheme of software and hardware of AC charging spot ismade. In the aspect of hardware, main circuit includes MCU circuit, power circuit, voltage/current signal conditioning circuit, CAN bus interface circuit for communicating withbackground management system and man-machine interaction circuit. Normallyman-machine interaction circuit includes POS interface, touch-screen display interface,voice prompt interface. Based on the characteristic of hardware circuits and energymeasurement chips in this paper, the design of software that matched to the AC chargingspot is also carried on.AC charging spot usually works in the form of charging station, so backgroundmanagement software is needed to match the AC charging spot. Background managementsoftware is to finish the functions of sending and receiving data, analysis, management,and storage. Background management software was developed based on LabVIEW andused LabSQL toolkit for database operations. Background management softwarecommunicates with AC charging spot through CAN bus. Refering to the communicationprotocols between electric vehicle on-board charger and AC charging spot, thecommunication protocols between BMS and AC charging spot is formulated.Electricity metering principle is introduced in this paper and also introduces the basicknowledge about energy meter measurement of the special electrical energy measurementchip. At last, some knowledge about intelligent charging method is introduced. The AC charging spot developed in this paper features with perfect functions, simpleoperation and stable running. The AC charging spot also has passed the relevant testingorganizations, so it has a broad application prospect and potential market and plays a keyrole in the popularity of electric vehicles.