Analysis of conducted emission from induction plate and recommending the minimization techniques

The concept for this research work is based on the conducted emission (EMI) and concerns related to it. Daily use home appliances like Microwave Oven, Induction Plate, Hair Dryer as well as wireless equipments like Wi-Fi router/modem, cordless phone, laptop emits conducted EMI. This EMI can result in such situations which are potentially hazardous and may put the life of other equipments in danger. To avoid such situations and to minimize risk associated with these equipments, analysis is required. Induction plate, which is commonly used for the cooking purpose, has been taken as model for analysis of conducted emission. The Conducted Emission from Induction plate of “Prestige” make, Pic 3.0V2 2000 Watt, has been measured with SCHAFFNER make Line Impedance Stabilization Network (LISN) and SCHAFFNER SCR 3501 Spectrum Analyzer. The Induction Plate was first tested without filter. After this test, Conducted Emission level was found to be exceeded at some frequencies. Later the Induction Plate was tested with RFI filter, which was connected in between the power supply cable. After this testing, when results were compared with CISPR standards, it was found that the Conducted Emission level is reduced by 15 to 20 dB. Hence if Induction Plate is used with RFI filter, it would be helpful to meet EMI/EMC compliance.