For indoor units where H­0 is <1.8m, as well as indoor units connected to one or more spaces via ducts which supply or return air from the space at a height <1.8m, circulation airflow for the purpose of mixing the air in the room shall be provided. This circulation needs to operate continuously, or be turned on by the refrigerant detection systems, also turning off the compressor unless the compressor operation reduces the leak rate, or the total amount released to the indoor space.

TI collateral for designers: TIDA-010265 750-W Motor Inverter with C2000™ and MSPM0 Reference Design

Design Overview: This reference design is a 750W motor drive for washing machines or similar equipment, demonstrating sensorless field-oriented control (FOC) for a three-phase PMSM using either FAST software or an enhanced sliding-mode observer (eSMO). It supports both C2000™ and MSPM0 MCUs with a modular design. The ready-to-use hardware and software accelerate time to market. The design guide includes hardware details and test results. A MathWorks model-based approach facilitates faster development, requires fewer resources, and is portable across C2000 microcontroller families, allowing for offline development, tuning, and validation.

Figure 2-13 TIDA-010265 Reference Design Block Diagram

Features:

• Wide operating voltage input range of 165V to 265VAC and 50Hz or 60Hz
• Up to 750W inverter stage, 15kHz switching frequency, torque compensation, and automatic field weakening control
• Modular design with either C2000 MCU or MSPM0 controller daughterboard on the same power motherboard
• FOC motor control, supports both FAST and eSMO
• User-friendly graphical user interface to control, identify and monitor the motor
• C2000™ microcontroller (MCU) motor control software and accompanying GUI is available in the C2000WARE-MOTORCONTROL-SDK version 5_01 and newer.
• Model-based design using MathWorks MATLAB and Simulink is available in C2000WARE-MOTORCONTROL-SDK version 5_02 and newer. The design demonstrates model-based motor control with support for various sensorless observers and current sensing methods.

TI collateral for designers: 250W Motor Inverter Reference Design With GaN IPM DRV7308

Design Overview: This reference design is a 250W motor drive for major appliances, featuring a GaN IPM DRV7308-based high-efficiency motor inverter that operates without a heatsink, and includes a low standby power design with UCC28911. The design demonstrates sensorless FOC control for a 3-phase PMSM using FAST™ software or eSMO. The modular design supports both C2000™ and MSPM0 microcontrollers on the same motherboard. The tested and ready-to-use hardware and software help speed up development time. Design details and test results are provided in the design guide.

Figure 2-14 TIDA-010273 Reference Design Block Diagram

Features

• Peak efficiency >99%
• No heatsink needed for up to 250W inverter stage, 15kHz switching frequency
• 80mm by 55mm compact board size
• Low-standby power design
• Modular design with either C2000 or MSPM0 controller daughterboard on the same power motherboard
• Sensor-less field-oriented control (FOC) motor control, supports both FAST and eSMO
• User-friendly graphical user interface (GUI) to control, identify, and monitor the motor