Dual Frequency Buck-Boost Interleaved Inverter for All Metal Induction Heating Applications

Multiple load induction heating applications require good control techniques and high power inverters. A dual frequency buck-boost inverter configuration for different loads operating at different frequencies is proposed in this paper. Each load uses one half-bridge series resonant inverter. Effective input voltage to each half-bridge becomes 2VDC in this configuration and hence it handles same power as that of full-bridge topology. Through buck-boost converter half of the load power is supplied to each load and remaining half load power is transferred directly from the source. With ADC control, each load power is controlled independently. This topology uses less number of components. The presented inverter configuration is simulated with two loads and can be extended to multiple loads also.