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Motor-drive reference designs from ST Microelectronics

26 July 2022

ST Microelectronics has released two reference designs that simplify building complete industrial or home-appliance motor drives for compressors with the STSPIN32 motor-control system-in-package (SiP). Each integrates the motor controller with a three-phase inverter to power the motor, and an offline converter and auxiliary circuitry. A production-ready printed circuit board (PCB) design and motor-control firmware are also included.

The STEVAL-CTM011V1 targets general industrial compressors up to 250 W, while the STEVAL-CTM012V1 meets the stringent eco-design regulations for use in home appliances. The plug-and-play reference designs combine easily with a host system to start driving a motor and allow customers to fine-tune settings for optimal performance. Both ensure average efficiency greater than 96.5%.

At the heart of each design, the STSPIN32F0601Q motor-control SiP contains an STM32F031 Arm Cortex-M0 microcontroller to customize the motor control to specific end application needs and a very rugged 600 V three-phase gate driver for the inverter. The firmware provided includes high-efficiency sensorless field-oriented control (FOC). The SiP is a compact and thermally efficient quad flat no-lead (QFN) device that meets high creepage requirements for safety and reliability.

The offline AC/DC converter is a VIPER122 analog converter that integrates control logic with an 800 V avalanche-rugged power section. Frequency jittering prevents interference with other equipment, while inherently low power consumption and support for burst-mode operation at light load help comply with energy-saving regulations.

Source: STMicroelectronicsSource: STMicroelectronics

The inverter stage of the 250 W STEVAL-CTM011V1 reference design for industrial and general-purpose applications comprises six rugged STGD5H60DF insulated gate bipolar transistors. They are engineered to maximize efficiency at high switching frequencies, allowing smaller capacitive and magnetic components. In addition, low package thermal resistance enhances reliability and tight parameter distribution assists safe paralleling in high-power applications.

The STEVAL-CTM012V1 home-appliance reference design contains six STPOWER STD8N60DM2 600 V N-channel MDmesh DM2 power metal-oxide-semiconductor field-effect transistors. These are ideal for high-efficiency converters, including zero-voltage switching phase-shift converters, and combine high-speed, low-loss switching performance and low on-state losses.

The production-ready circuit-board design saves significant development time, avoiding complex layout and signal-routing challenges. The compact 11.2 cm x 7.5 cm board outline helps meet industrial and consumer-appliance form factors.

To contact the author of this article, email GlobalSpecEditors@globalspec.com

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