Design and analysis of RFI and EMI suppressor for high frequency induction heater using filters — A comparative study

The proposed paper deals with the design and analysis of RFI and EMI suppressor for high frequency Induction Heating equipment using filters. The simulation has been done in PSIM software. The harmonics that are injected because of the high frequency switching have been a major problem in induction heating applications. These harmonics can be reduced by the connection of a low pass filter between the ac supply and the induction heating equipment. The design should be in accordance with the harmonic standards that play a very crucial role in deciding the amount of current harmonics that is allowed to flow back to the supply side. In this present work, a Semi Active Filter has been proposed that has much better harmonic attenuation ability than the existing passive filters. The THD of input current has been compared to show that the former is able to maintain much better power quality than the latter. Moreover, both of them are also compared to the system without an LPF to show the necessity and importance of low pass filters in Induction Heating Equipment.