Why can the mainboard of an AC charging pile ensure safe charging?

The mainboard of an AC charging pile ensures safe charging by locking the risks of "power, grid, vehicle, and person" onto a single PCB—eliminating hazards before the plug connects, using chip-level algorithms and millisecond-level protection. This can be summarized into six "safety locks":

Electronic Lock: Chip-level Measurement and Voltage Stabilization

• The Class 0.5 metering SOC (e.g., HT5015) samples voltage/current every second with an error of <±0.5%. It maintains stable voltage output during rainy nights, high temperatures, and load fluctuations, preventing battery overcharging or undercharging.

Network Lock: Millisecond-Level Leakage and Arc Protection

• 6mA DC + 30mA Type A fluxgate chip, 0.1ms hardware closed-loop; rain-sensing conductivity, gun tip micro-arc instant cut-off, 50 times more sensitive than the old 300mA main circuit breaker, preventing electric shock and fire.

Vehicle Lock: Bidirectional Handshake with BMS

• CAN/PLC dual PHY, the charging gun completes VIN authentication, battery temperature, and SOH verification within 3 seconds. If the battery overheats or the relay sticks, the mainboard first reduces power and then cuts off the power supply, preventing "charging with faults.".

Personnel lock: Remote + Local Dual Emergency Stop

• Physical emergency stop button + cloud-based remote shutdown, with a 0.1s hard-cut relay; local emergency stop remains functional even when 4G/Bluetooth is disconnected, independent of network connectivity.

Environmental Lock: Full Operation Range from -40°C to +85°C

• -40°C AEC-Q100 devices, 105°C electrolytic capacitors, IP54 conformal coating, ensuring reliable startup under salt spray, condensation, and dust conditions.

Data Lock: Blockchain-Level Encrypted Settlement

• The ESAM security chip performs SM4 encryption and hash-based on-chain recording for each kilowatt-hour of electricity to prevent "cloned cards" from unauthorized transactions; it supports OTA differential updates at 128kB/30s, and the device will refuse to boot if the firmware is tampered with.

In one sentence: The mainboard of AC charging piles uses six "locks"—"chip-level metering, millisecond-level protection, bidirectional handshake, and blockchain settlement"—to contain all risks involving electricity, grid, vehicles, people, environment, and data within 0.1 seconds—this is the foundation for your peace of mind when charging.

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