SiC multi-inverter frequency band division design for increased flexibility in an induction heating surface area

This paper presents a simple solution to combine three one-switch inverters in a cell sharing one EMI filter and avoiding the appearance of audible intermodulation distortion. The concept is based on making the designs asymmetric thus distributing in different frequency bands the switching frequencies. With some previous analysis to support the selection of these frequencies, no audible noise appears. This concept has been tested experimentally with results showing good agreement with predicted ones.