Resonant Converter

Overview

This project is an LLC resonant converter. The power supply is designed to step down a nominal 60V input to a 12V output, capable of delivering up to 10A of continuous current (120W).

The board features power telemetry using an INA219 sensor, which can be easily interfaced via a standard QWIIC connector.

Key Features

• Input Voltage: 60V ± 5%
• Output: 12V @ 10A
• Topology: LLC Resonant Converter
• Telemetry: Onboard INA219 power monitor with a QWIIC I2C connector
• Magnetics: Custom-wound transformer

Project Status

Design: ✅ → Fabrication & Assembly: ✅ → Bring-up: ✅

[!IMPORTANT] Hardware modification required (rev.1.0.0):

Replace R20 with a diode (e.g. 1N4148) to prevent VCCP from backfeeding U3. Without this fix, VCCP remains too low for the LLC controller U1 to start up.

Used Tools

• KiCad - Schematic and PCB design