With the rise of photovoltaic-storage-direct-soft architecture, how can AC charging pile control boards "shake hands" with DC bus microgrids without burning out?

In photovoltaic-storage-direct-flexible buildings, the AC charging pile control board and DC bus "handshake" without burning out. The core lies in adding a "wide-range DC/DC + bidirectional AC/DC + flexible protocol" trio inside the board, transforming the pile from a "grid load" into a "microgrid node.".

The fatal flaw of traditional charging piles lies in their design based on a unidirectional AC path. If forcibly connected to a 380V DC bus, the rectifier bridge will reverse breakdown, the PFC inductor will saturate, and the relay will stick, leading to destruction within three seconds.

In 2026, the mainstream solution adopts a wide-range DC/DC converter to replace PFC, with an input of 200-1000V DC covering the full range of photovoltaic systems and an efficiency exceeding 97%. The mid-section retains AC output to ensure compatibility with existing vehicles, while adding a new 250-450V adjustable DC port for direct bus connection, with AC and DC interlocking to prevent short circuits. The backend runs a flexible protocol stack, communicating with building EMS via Modbus-TCP to receive available power commands, negotiating DC parameters with vehicles via ISO 15118-20, and obtaining real-time status from photovoltaic storage systems via SunSpec.

The handshake process consists of three steps: physical handshake to detect the gun head type, with the DC gun pre-charging to check polarity; protocol handshake where the charging pile reports requirements, EMS schedules power, and the pile and vehicle negotiate; energy flow: during photovoltaic surplus, DC efficiency reaches 97% directly; when insufficient, energy storage supplements; in case of grid failure, V2H provides reverse power supply.

Three burn-out prevention mechanisms: voltage window protection (200-1000V) with a 100ms cutoff for out-of-range conditions; current direction protection via Hall real-time detection, immediately disconnecting if exceeding 1A in reverse; thermal coupling protection that reduces overall power when any module exceeds 85°C.

Compared to traditional AC charging piles with external inverters (85% efficiency), the PV-Storage-Direct-DC compatible pile achieves 97% efficiency at lower hardware costs, offers AC/DC dual output for vehicle compatibility, and delivers superior total cost of ownership (TCO), truly enabling integrated PV-storage-charging solutions.

Xincheng Technology's AC charging piles are of superior quality and competitive prices. Feel free to inquire and make your purchase!