This paper focuses on a nine level multilevel inverter with DC link capacitors at the input side. The main disadvantage of cascaded multilevel inverter is the number of DC sources. So a nine level multilevel inverter with DC link switches, which requires less number of DC sources as compared to the conventional multilevel inverter is proposed. Single carrier method is the control strategy used here. A comprehensive literature survey on existing nine level multilevel inverter is carried out. The feasibility of the proposed nine level inverter is verified through simulation. Proposed nine level inverter is compared with the conventional H bridge multilevel inverter.

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Induction heating (IH) is nowadays widely used in domestic, industrial and even medical applications because of its advantages such as cleanliness, direct and fast heating, better efficiency etc. Advances are taking place rapidly in the technologies mainly in the power electronics section and the control used in IH. This paper analyses a voltage fed inverter with the power control strategy that allows the inverter switches to operate at zero voltage switching at a load range from 0-100%. The frequency is maintained constant and thus the switching losses are minimized. The soft-switching achieved over the entire load range improves the overall efficiency and the results are analyzed using MATLAB/Simulink.

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