STMicroelectronics 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 PCB design and motor-control firmware are also included.
The STEVAL-CTM011V1 targets general industrial compressors up to 250W and 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, ST’s STSPIN32F0601Q motor-control SiP contains an STM32F031 Arm Cortex-M0 microcontroller to customize the motor control to specific end application needs and a rugged 600V 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 800V 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.
The inverter stage of the 250W STEVAL-CTM011V1 reference design for industrial and general-purpose applications comprises six rugged STGD5H60DF insulated gate bipolar transistors (IGBTs). They are engineered to maximize efficiency at high-switching frequencies, allowing smaller capacitive and magnetic components. In addition, their 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 600V N-channel MDmesh DM2 power MOSFETs. These are ideal for high-efficiency converters, including zero-voltage switching (ZVS) phase-shift converters, combining 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 x 7.5cm board outline helps meet industrial and consumer-appliance form factors.
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