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Dual Motor Control with Interleaved PFC for Air Conditioner Outdoor Unit Reference Design

AIR-CON-ODU-REF

Renesas' Air Conditioner Outdoor Unit (ODU) reference design is a total solution for controlling outdoor air conditioning units. It is used in combination with the MCI-HV-AC which is AC200V high-voltage inverter board, communication board, and peripheral devices. It is capable of evaluating and developing dual motor control with the provided permanent magnet (PM) sensorless vector control sample code. 

Features

  • Reference design integrating the RX26T microcontroller and a 3-phase inverter circuit
  • Dual motor control function (compressor and fan)
  • Open-loop start (current pull-in control) during stop and low-speed operation
  • PM sensorless vector control using induced voltage observer during medium to high-speed operation (1-shunt and 3-shunt)
  • Flux weakening control for high-speed operation and maximum torque per ampere (MTPA) control for IPMSM
  • Torque vibration suppression function, step-out detection, and flying start (catching control)
  • Single-phase and interleaved PFC control (power factor correction and boost function)
  • MCI-HV-AC inverter board features
    • Supports single-phase AC input (AC100V ~ 240V, 50Hz/60Hz)
    • Supports 2-motor (compressor, fan) control
    • Equipped with overcurrent detection, overvoltage protection, and overheat detection functions
    • Equipped with a four-way valve and expansion valve control interface
    • Equipped with temperature control sensor interface
    • Equipped with air conditioner indoor unit communication interface

Applications

Motor Control, Building Automation
AIR-CON-ODU-REF Reference Design Inverter Board - Top
AIR-CON-ODU-REF Reference Design Inverter Board - Top with Isolated MC-COM Communication Board
AIR-CON-ODU-REF Reference Design Inverter Board - Top
AIR-CON-ODU-REF Reference Design Inverter Board - Top with Isolated MC-COM Communication Board

Products in the Design

3D illustration featuring top and bottom of LFQFP ic chip package with 48 leads
RX 32-Bit Performance/Efficiency MCUs
RX26T Active
32-bit Microcontroller Optimized for Dual-Motor and PFC Control
Datasheet

Add-on Hardware

Additional boards that work with this platform. Some may be required for full functionality or to evaluate specific features.
MC-COM

Renesas Flexible Motor Control Communication Board

MC-COM Active
Enable safe and isolated serial communication between Renesas MCUs and motor control systems. Supports reliable debugging and evaluation in motor control development environments.
Recommended Documents:
MC-COM User's Manual
MC-COM DesignPackage

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Blog Post
Jun 4, 2025
Simpler and Safer High-Voltage Motor Control Evaluation

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