
Refrigerator compressors are now driven by brushless DC motors or permanent magnet synchronous motor to meet high energy efficiency ratings. You must use an inverter-based variable speed drive for the brushless motor to achieve this high energy efficiency. The variable speed drive allows you to operate the compressor at an optimal speed in order to maintain a constant temperature setting as
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Refrigerator compressors are now driven by brushless DC motors or permanent magnet synchronous motor to meet high energy efficiency ratings. You must use an inverter-based variable speed drive for the brushless motor to achieve this high energy efficiency. The variable speed drive allows you to operate the compressor at an optimal speed in order to maintain a constant temperature setting as compared to a fixed-speed single-phase AC induction motor (ACIM) drive. Field-Oriented Control (FOC) of brushless motors enables you to implement the variable speed drive and add advanced motor control features like on-the-fly startup and stall detection with auto-recovery.
This refrigerator compressor reference design will help you to rapidly prototype and develop a cost-effective and innovative design using a dsPIC33EP64MC202 Digital Signal Controller. Other Microchip components utilized in the design include a MCP16331 DC/DC converter and a MIC5239 LDO voltage regulator. The design works with a wide variety of refrigerator compressor motors, supporting both Interior Permanent Magnet Synchronous Motors (IPMSM) and Surface Mount Permanent Magnet Synchronous Motors (SPMSM).This reference design implements sensorless control and single-shunt current sensing technique to save BOM cost. This design also addresses the challenges of reliable startup of the compressor with high pressure and low standby power consumption.
Microchip provides Class-B Safety Software libraries for the dsPIC33 to reduce your development time for appliances requiring functional safety.
Ready for a live demonstration? This reference design is provided with full user’s guide, source code, schematics and PCB layout. Contact Microchip for demonstration, design files and firmware.