SECC Solution for Charging Pile Applications

As the global energy transition accelerates towards cleaner and smarter systems, the deep integration of electric vehicles (EVs) with power grids has emerged as a critical enabler. Vehicle-to-Grid (V2G) technology not only turns EVs into mobile energy storage units but also empowers them to support grid peak shaving and the integration of renewable energy. In this transformative shift, the SECC (Supply Equipment Communication Controller), the "intelligent brain," which bridges charging stations and vehicles, plays a pivotal role.

1. SECC: The "Protocol Converter" and "Decision Hub" for Smart Charging

As the core control unit of EV charging stations, the SECC coordinates with the Electric Vehicle Communication Controller (EVCC) to negotiate charging parameters, monitor the charging process, and manage operational functions. Leveraging Power Line Communication (PLC) technology or other dedicated protocols, it facilitates data exchange with the vehicle to ensure safe, efficient, and compatible charging.

2. Protocol Compatibility

The charging protocol serves as the "common language" between charging stations and electric vehicles. 

ISO 15118: The internationally mainstream standard that supports Plug & Charge (P&C) and V2G bidirectional charging/discharging, enabling seamless authentication and payment through digital certificates.

DIN 70121: A widely adopted communication protocol in Europe, regarded as a lightweight version of ISO 15118, serving as a "passport" for market access in the region.

GB/T 27930: The DC charging standard widely used in China, featuring mature technology, though it requires upgrades in V2G support and contactless payment capabilities.

3. Core Architecture of the MYIR’s SECC Solution

PLC Modem Circuit: Superimposes high-frequency carrier signals onto the charging control signal (CP) and ground line (PE) to enable data transmission between the charging station and the vehicle.

CP Signal Generation Circuit: Generates CP signals with specific duty cycles (e.g., 5%) to establish communication links and transmit charging parameters.

ADC Acquisition Circuit: Monitors input voltage and detects resistance values on the CP and PE lines to determine gun insertion status and authorize charging.

Communication Interface Circuit: Supports multiple communication methods including CAN bus, Ethernet, and PLC, enabling data exchange with the charging station management platform and EVCC.

Safety Protection Circuit: Integrates over-current, over-voltage, and insulation detection functions to ensure electrical safety during charging.

MYIR's SECC solution delivers a high-standard, low-risk rapid development platform for clients, with core strengths in protocol compatibility, operational security, and a comprehensive reference design.