Induction heating apparatus using a pair of inversely series connected gate-controlled switching devices

Abstract From the Canadian patent

An induction heating apparatus comprises a pair of inversely series connected first and second gate-controlled switching devices and a pair of feedback diodes each being inversely parallel connected to the first and second switching devices, respectively. A high frequency resonant circuit is connected in series or parallel circuit relation with the gatecontrolled switching devices to a source of low frequency alternating voltage. A gating circuit triggers the first and second switching devices in the order named during a first half cycle of the alternating voltage and in a reversed order during the second half cycle of the alternating voltage.