This invention relates to a protective housing for the charging cable of an electric vehicle (EV) charging pile. The protective housing comprises a main body; the inner bottom wall of the main body is fixedly attached to the bottom of a limit plate. A door is pivotally attached to the opening of the main body via a hinge pin. A handle is fixedly attached to the bottom edge of one side of the door. One end of the limit plate features a buffer slot, within which a buffer plate is pivotally mounted. One end of a spring is fixedly attached to the inner wall of the buffer slot, while one side of the buffer plate is fixedly attached to a sponge pad. This protective housing for the EV charging pile's cable facilitates the opening of the door via the handle; the sponge pad serves to reduce vibrations generated when the door is closed, and the compression of the spring acts to cushion the impact force produced during the door's closure. Furthermore, the interlocking connection between a limit block and a corresponding slot ensures the stability of the door, while a pull ring and a trapezoidal top plate facilitate the opening of the door.
This invention also relates to a testing and verification system for EV charging piles. The system consists of two main components: a system for testing the Device Under Test (DUT), and a system for verifying interoperability and protocol compliance, as well as electrical performance. The interoperability and protocol compliance verification system includes: a test system cabinet, a programmable AC power supply, an industrial PC, safety regulation testing equipment, EV charging pile interoperability testing equipment, a battery simulator, and a programmable AC load. The electrical performance verification system includes: a test system cabinet, a programmable AC power supply, a programmable AC load, a programmable DC load, a power analyzer, waveform acquisition equipment, and an industrial PC. The system is capable of automatically conducting a comprehensive suite of tests covering both interoperability/protocol compliance and electrical performance for the charging pile. Its output capabilities allow for the simulation of various battery characteristics-including configurable series and parallel cell configurations-and the replication of battery charging and discharging characteristics across different States of Charge (SOC); additionally, the system can generate customized battery model outputs according to specific client requirements.
The energy metering assembly for electric vehicle (EV) charging piles is integrated into the charging pile's control system. It comprises a metering chip, along with a first current sampling circuit, a second current sampling circuit, a voltage sampling circuit, an auxiliary power supply, and an isolated communication circuit-all connected to the metering chip. The metering chip communicates serially with the charging pile's central controller via the isolated communication circuit; it collects the live-wire current and neutral-wire current through the first and second current sampling circuits, respectively, and acquires the charging voltage via the voltage sampling circuit. The auxiliary power supply provides power to this metering assembly. Based on the collected live-wire and neutral-wire current data, the metering chip performs leakage detection, thereby enabling the timely elimination of faults and the reduction of safety hazards. By integrating the metering assembly directly into the EV charging pile's control system, complex wiring is eliminated; furthermore, utilizing a dedicated metering chip as the processing unit ensures accurate metering and allows for functional expansion through the configuration of the chip's pins.
