This document describes how to set up and use the 3-Ph OBC PFC-LLC On-Board Charger platform. The system incorporates a 3-Ph Power Factor Correction (PFC) stage based on a 3-leg voltage source inverter and the DC-DC conversion stage based on an LLC resonant converter. Each of these two stages consist of a main board with all the necessary subsystems to run either as an OBC - cascading the boards PFC and LLC - or as separated stand-alone systems.
The EVBUM2673/D user manual describes the SEC-3PH-11-OBC-EVB, a 3-phase on-board charger platform made of a PFC board and an LLC board. It explains the hardware setup for each board, required parts, power-up, and GUI operation for the LLC stage.
The PFC stage is based on a 3-leg voltage source inverter and produces a 700 ±5% Vdc DC bus, while the LLC resonant converter stage supports an output range of 200 to 450 V. The manual also covers serial communication settings, monitored variables, data saving, heatsink monitoring, and the command interface.
| PFC input voltage | 195–265 Vac per phase |
|---|---|
| DC bus output | 700 ±5% Vdc |
| LLC output voltage range | 200 to 450 V |
| PFC input current | 17 Arms |
| PFC output current | 14.3 A @ 700 V |
| PFC switching frequency | 60–140 kHz |
| LLC switching frequency | 400 kHz |
| LLC output current | 0–40 Amax |
The PFC board accepts 195–265 Vac per phase.
The PFC stage self-regulates to deliver 700 V ±5% at its output.
The LLC board can be connected to a suitable load with a functional range between 200 and 450 V.
The baud rate has to be kept at 115200; otherwise the protocol will fail.