A teardown of BYD’s 7kW home EV charger reveals a smart dual‑MCU design with built‑in safety at every level. What’s most striking? The solution is powered by a highly localized lineup of Chinese chips and components.
This BYD charging pile, compact and wall-mounted, delivers up to 7kW, providing ~50 km range/hour—ideal for overnight household charging. It features a standard 7-hole AC socket (national standard) with live, neutral, ground, CC, and CP signals, plus an emergency stop button (Yijia YJ-LA16 connector).
Opening the casing requires special tools to remove 12 tamper-proof screws, revealing:
- Top cover: LED status indicator and NFC communication boards.
- Bottom cover: Core control mainboard and charging cable assembly.
LED Status Indicator Board
Uses a dual-color (red/green) LED, powered via backplane interface, to display charging status (connection, charging, fault, completion).
NFC Communication Board
Handles user authentication and charging authorization.
- Main control MCU: MindMotion MM32F0010A1T (32-bit ARM Cortex-M0, 48MHz, 16KB Flash, 2KB RAM).
- NFC reader chip: Wisesun WS1850S (13.56MHz contactless, supports SPI/I2C/UART).
- Other components: Buzzer, two Jingweite crystal oscillators, 5V-3.3V LDO.
Core Control Mainboard
Acts as the system “brain,” managing charging control, communication, protection, and power.
Please refer to the elaborate BOM analysis as below.
| Manufacturer | Model | Description |
| Nations Technologies | N32G452CCL7 | 32-bit microcontroller |
| Everlight | EL0452 | High-speed optocoupler |
| Everlight | EL3H7 | Optocoupler |
| Everlight | EL817 | Linear optocoupler, used in the power supply feedback loop to stabilize voltage and provide isolation |
| hiliwi | HLW8032 | Power metering chip, high-precision metering without calibration |
| Microdiode Semiconductor | D83075A-1A-1A-TR | Inverter |
| Micro-Star | ME8115F | PWM switch-mode power supply controller |
| MEISHUO | MPQ1-S-112D-A | 12V power relay |
| ZHENHENGTONG | ZHTPT107 | Miniature electric current transformer |
| Mornsun | A1212S-WR3 | Isolated non-regulated module |
| STE | MPX310VACX2 | AC capacitor |
| Texas Instruments | LM2903AVQ | High-voltage dual differential comparator |
| Texas Instruments | TPS54331 | 28V, 3A adaptive buck converter |
| STMicroelectronics | LM239 | Low-power quad comparator |
| Fudan Microelectronics | FM2417 | With individual data protection function |
| Changjing Electronics | CJT1117P | Linear voltage regulator |
| Wisesun (Huiling) | WS1850S | 13.56MHz contactless read/write card chip compliant with ISO/IEC14443 standard |
| MindMotion Microelectronics | MM32F0010A1T | 32-bit microcontroller based on Arm Cortex-M0 |