AC EV Charger Reference Design
An illustrative reference design for the main control board of AC chargers (7 / 11 / 22 kW) on the consumption / charging side of PV & ESS: CP control pilot (±12 V PWM) and PP connection confirmation, residual current detection, energy meter reading over RS-485 (DL/T 645), and both Ethernet and 4G uplinks to the OCPP platform on networked models; 12 V is supplied by the charger's internal AC/DC module. Each position is marked with the VOOHU parts available, recommended part numbers and package pinouts.
Illustrative PCB ⇄ Schematic
Illustrative top-side view arranged by functional zone (not the actual layout). Red numbered dots mark positions VOOHU can supply. Click a component on the board, an entry in the index below or a part in the schematic to see recommended parts and package pinouts on the right.
Illustrative control pilot topology: the MCU generates a 1 kHz PWM, which CP circuit U2 outputs as ±12 V onto the charging gun's CP line, and the circuit also detects the voltage level after the vehicle side pulls it down; the CP / PP lines are clamped to ground by the VOOHU 30 V bidirectional ESD D1 (WHALD30E2B). The 1 kΩ output resistor, diode and divider network are designed per GB/T 18487.1 / IEC 61851-1 and are shown only illustratively.
Board bill of materials
Summarized by position; click any row to locate it on the board above.
| No. | Zone | Position | Ref. | VOOHU category | Recommended part | Availability |
|---|---|---|---|---|---|---|
| 01 | A Pilot / RCD | Charging cable CP / PP connector | J1 | — | — | Non-VOOHU |
| 02 | A Pilot / RCD | CP / PP ESD | D1 | TVS ESD | WHALD30E2B | VOOHU |
| 03 | A Pilot / RCD | CP detection & PWM driver | U2 | — | — | Non-VOOHU |
| 04 | A Pilot / RCD | Residual current detection (RCM, 6 mA DC / 30 mA AC) | U3 | — | — | Non-VOOHU |
| 05 | B Meter / 4G | Meter RS-485 terminal | J2 | — | — | Non-VOOHU |
| 06 | B Meter / 4G | RS-485 GDT | GDT1 | GDT | WHGT090V1P0A | VOOHU |
| 07 | B Meter / 4G | RS-485 CMC | L1 | Signal Line Common Mode Chokes | WHAC-4532A-510U0 | VOOHU |
| 08 | B Meter / 4G | RS-485 ESD / TVS | D2 | TVS ESD | WHALD30E2B | VOOHU |
| 09 | B Meter / 4G | Isolated RS-485 transceiver | U4 | — | — | Non-VOOHU |
| 10 | B Meter / 4G | Nano SIM card socket | J3 | SIM Card Sockets | WHNS135-T1151-01 | VOOHU |
| 11 | B Meter / 4G | SIM card ESD array | D3 | TVS ESD | WHTA5V01P2C | VOOHU |
| 12 | B Meter / 4G | 4G Cat.1 module | U5 | — | — | Non-VOOHU |
| 13 | C Ethernet | RJ45 (OCPP uplink) | J4 | RJ45 Connector | WH56A31882021103 | VOOHU |
| 14 | C Ethernet | Ethernet port gas discharge tube | GDT2 | GDT | WHGD090V1P0B | VOOHU |
| 15 | C Ethernet | 10/100 LAN transformer (high isolation) | T1 | LAN Transformers | WHSH16F01D4 | VOOHU |
| 16 | C Ethernet | Eth ESD array | D4 | TVS ESD | WHALD03G4U | VOOHU |
| 17 | C Ethernet | 10/100 PHY | U6 | Ethernet PHY | JL1101BR-NI | VOOHU |
| 18 | C Ethernet | Push-pull driver + rectifier / LDO | U7 | — | — | Non-VOOHU |
| 19 | C Ethernet | Push-pull isolation transformer | T2 | Push-Pull Transformers | WHST06K02A0 | VOOHU |
| 20 | D Control core | MCU (charging control + OCPP) | U1 | — | — | Non-VOOHU |
| 21 | E 12 V power | 12 V power input (in-charger AC/DC module) | J5 | — | — | Non-VOOHU |
| 22 | E 12 V power | Input power-line common-mode choke | L2 | Power Line Common Mode Chokes | WHAL-7060A-102T0 | VOOHU |
| 23 | E 12 V power | Buck converter (12 V → 5 V / 4G 3.8 V) | U8 | — | — | Non-VOOHU |
| 24 | E 12 V power | Buck converter (5 V → 3.3 V / core) | U9 | — | — | Non-VOOHU |
| 25 | E 12 V power | Molded inductors ×2 (DC-DC) | L3 L4 | Molded Inductors | WHYT0630 Series | VOOHU |
Resources & downloads
Board bill of materials
Reference designators, zones, VOOHU categories, recommended parts and availability for all 25 positions. Opens directly in Excel.
Datasheet collection
Datasheet PDFs for the VOOHU parts recommended on this board.
Design files & footprint library
Schematic, PCB, and VOOHU part footprints and 3D models.
Coming soonRequest the AC EV charger reference design full package
Includes the full-board position list, datasheets for the recommended VOOHU parts and position-by-position selection notes. For selection advice tailored to your power rating, network connection (Ethernet / 4G / Wi-Fi) or certification requirements, please include it in your requirements. We reply within 24 hours on working days.
