Three-Phase Power Supply / Multifeeder Board

• Overview

Compact three-phase-input power-supply board based on a customer-provided design. The board accepts L1/L2/L3/N mains input and provides isolated low-voltage power and supervision functions for the host system.

• My contribution

I refactored and cleaned up the customer schematic, then designed the PCB completely from scratch. I was responsible for component placement, routing, mechanical integration, 3D verification and the complete manufacturing documentation package.

• Engineering highlights

The design combines three-phase mains input, high-voltage rectification, filtering, isolated flyback conversion, low-voltage regulation and AC/power supervision on a compact board. The PCB required clear separation of high- and low-voltage domains, practical routing of high-current/high-voltage paths, accommodation of large through-hole power components, and strict coordination with the mechanical envelope and connectors.

• Result

The finished board was prepared for manufacturing and released to production.

• Tools / technologies

Altium Designer, three-phase mains input, AC/DC conversion, flyback SMPS, high-voltage PCB layout, power supervision, DFM, manufacturing documentation.