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Refrigerator compressor digital inverter


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Saves money through adaptable compressor control

Due to today’s power saving requirements, digital inverters for refrigerators are becoming more popular. A compressor driven by a digital controlled inverter has the power to adapt itself to the usage habit of the consumer throughout the day and it can operate at various speeds. It will speed up during the day as you open and close the doors, and at night, slow down to maintain the temperature. This simple action can save users 20-30% on their electric bill.

This design uses a combination of the 16-bit MCU (RL78/G14) and op-Amp (READ2302) to ensure an adaptable and robust solution for this type of application. Supporting a power rating up to 350W, this design uses the MCU to control the BLDC compressor motor (180 degree sine wave control) and the op-amp is used for motor current sensing using the 3-shunt control methodology.

Key features:

  • Adaptable to different compressors
  • Improved system efficiency and energy usage
  • 180 degree sensorless FOC control
woman looking into open refrigerator

refrigerator-compressor-body2-table and diagram

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Recommended products

Products Description Documents
RL78/G14 Low power consumption, high function general-purpose microcontrollers Hardware User's Manual
ISL80136 40V, Low Quiescent Current, High Accuracy, 50mA Linear Regulator Datasheet
OP Amp    
READ2302 High driveability and high slew rate, input output full range, CMOS dual operational amplifier Datasheet


Block diagram

Block Diagram: Refrigerator Compressor Digital Inverter

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