Improved modification of the single-switch AC-AC converter for induction heating applications

A new single-switch parallel resonant converter for induction heating is introduced. The circuit consists of the input LC-filter, bridge rectifier and only one controlled power switch. The switch operates in a soft commutation mode and serves as a high frequency generator. The improved scheme of the above converter is based on the prototype, which was previously introduced by the present authors, and avoids its shortcomings, i.e. the presence of the DC-component in the load current. The steady-state analysis of the converter operation is given. The theoretical analysis and computer simulation are in good agreement with the experimental results.