OpenVVVF

Open-source Variable Voltage Variable Frequency (VVVF) power electronics — a high-power, user-configurable 3-phase inverter platform.

Developed in Dr. Keith Corzine's Smart Power Lab at the University of California, Santa Cruz (UCSC).

Hardware at a glance

The OpenVVVF control board is fully isolated and power-stage agnostic:

Dual-MCU control — STM32H723ZG main MCU + STM32G474RCTx safety coprocessor
Fully isolated gate drives, voltage/current sensing, CAN transceivers, and digital inputs
Dual isolated CAN buses and isolated 24–60 V digital inputs
Designed to attach to the on-project 600 A / 800 VDC-class IGBT power stage, or to nearly any user-supplied power stage with appropriate gate-driver and divider scaling
The on-project power stage supports up to 800 VDC working bus depending on the DC link capacitor selection
Capable of driving PMSM, IPM, induction, and other 3-phase AC machines

OpenVVVF/Hardware — High-power 3-phase VSI hardware designs: dual-MCU control board, independent safety coprocessor, fully isolated gate drives and sensing, isolated CAN, and scalable power stages.
OpenVVVF/RTE — Firmware, Real Time Examiner (RTE) host tool, and node-based codegen/telemetry. Run arbitrary control schemes, any modulation strategy, and fully user-configurable signal flow via nodes.

User-configurable: Control schemes, modulation strategies, CAN protocols, and safety thresholds are all adjustable through node-based codegen tools.
Safety-focused: Dual-MCU architecture with an independent safety coprocessor, redundant safe-state pathways, and design-for-ASIL targets.
Fully open source: No vendor lock-in, no OTP/DRM, no encrypted bootloaders with unreplaceable keys. You own the hardware and the code.

Contributions are welcome. Start with the Hardware repo for schematics and build docs, or the RTE repo for firmware and tooling.