Refrigerator Compressor Digital Inverter

A compressor driven by a digitally 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, making digital inverters for refrigerators more and more popular. This design uses a combination of Renesas’ 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 350 W, this design uses the MCU to control the BLDC compressor motor (180° sine wave control), and the op amp is used for motor current sensing using the three-shunt control methodology.