EMI model of Air-conditioning Outdoor Machines

The air-conditioning outdoor machines have a complex electromagnetic environment with more than one EMI noise source. This paper investigates the influence of the driver system of air-conditioning outdoor machines, including the inverters to drive fans and air-conditioning compressor. A conducted EMI model for the air-conditioning outdoor machines is presented, which includes AC cables, power devices, PCB, reactor, the motors of fans and compressor. Based on the model, the influence of compressor system and fan system on the EMI of the whole outdoor unit system and the interference between them are analyzed.