3-Phase Interleaved Boost Converter — C2000 Firmware

Embedded firmware for a 3-phase interleaved boost converter running on the TI TMS320F28035 Piccolo Isolated controlCARD.

Overview

This project implements a fully functional 3-phase interleaved boost modulator with:

• 3-phase interleaved PWM with configurable phase delay and dead-time
• CLA (Control Law Accelerator) for real-time current control offloading
• Serial communication interface for parameter tuning and monitoring
• Ring buffer based command processing
• TI DSP/BIOS HAL (DSP2803x headers and drivers)

Hardware

Component	Details
MCU	TMS320F28035 Isolated controlCARD (TI Piccolo, 60 MHz, CLA)
Topology	3-phase interleaved boost (120 degree phase shift)
Control	Digital current-mode control via CLA

Project Structure

interleaved_boost/
├── main.c                 # Entry point — system init, ISR setup
├── application.c/h        # Application logic, state machines, serial protocol
├── device.c/h             # Peripheral configuration (PWM, ADC, GPIO)
├── I_Controller.cla/h     # CLA current controller implementation
├── CLAshared.h            # Shared variables between CPU and CLA
├── CLAtasks.cla           # CLA task definitions
├── DCL/                   # Digital Control Library (TI DCL)
├── defines.h              # System constants (PWM freq, dead-time, etc.)
├── globals.c              # Global variable definitions
├── ringbuffer.c/h         # Ring buffer for serial communication
├── commands.h             # Serial command definitions
├── error.h                # Error code definitions
├── hwrcommunication.py    # Python script for host-side serial communication
├── hal/                   # TI DSP2803x HAL (headers, drivers, linker scripts)
└── targetConfigs/         # CCS target configuration files

Key Design Decisions

• CLA for current loop: The TMS320F28035's Control Law Accelerator runs the inner current control loop independently from the main CPU, enabling higher control bandwidth
• Interleaved topology: 3 phases at 120 degree offset reduce input/output ripple by a factor of 3 at the switching frequency, enabling smaller passive components
• Serial interface: Runtime parameter adjustment (duty cycle, period, phase delay, dead-time) via Python script

Getting Started

Prerequisites

• Code Composer Studio (CCS) v5+
• TI C2000 compiler
• TMDSCNCD28035ISO controlCARD

Build and Flash

1. Import the project into Code Composer Studio
2. Set the target configuration to match your debug probe (XDS100v2 or similar)
3. Build the project (Project > Build All)
4. Connect the controlCARD and flash (Run > Debug)

Host Communication

Use the Python script to send commands and monitor parameters:

python hwrcommunication.py

Author

Riccardo Tinivella — developed at NTB/OST Buchs

License

See project files for license details.