Reliability increase of resonance induction heating units during the fault conditions

Purpose. To develop an automatic protection system against fault operation conditions for the resonant inverter of induction heating unit due to absence load. Methodology. Resonant load transfer function analysis using first harmonic approximation, calculation control parameters numerical methods, computer simulation unit. Experimental studies based on a smelter with microprocessor in order check adequacy proposed model and system. Findings. A is presented, which was verified by experimental results melting By this model, circuit low developed, shift operating frequency introduction additional phase difference between current voltage feedback loop. The methodology calculating created (‘capacitor bank-inductor-part’ system) methods solving equations. above method can be used inverters any configuration topology. According during fault, developed limits amplitude within safe region reactive elements, while normal does not affect successfully keeps oscillating loads. simple enough its quick implementation existing digitally controlled units has high speed. Originality. Methodology create limiting been developed. Practical value. Developed allows reduce process interruption user. Moreover, increases tolerance units. Structure simplifies modernization development new models such