FIELD: electricity.
SUBSTANCE: conversion device for induction heating based on a parallel bridge resonant inverter comprises two valve bridges on four controlled valves with DC and AC diagonals, parts of a throttle of an oscillating circuit, a source of supply, two capacitors, a double-winding inductor, semi-windings of which are arranged on a side surface of a crucible along the axis of the inductor and perpendicularly to this axis in an alternating sequence. In a control system in process of charge melting high-frequency single-phase electromagnetic field is generated, and in process of electromagnetic mixing and heating of a melted metal, double-frequency double-phase electromagnetic field is generated: low-frequency electromagnetic field with high-frequency modulation. By low frequency the electromagnetic field generated by the second valve bridge is shifted by 90° el. relative to the first valve bridge.
EFFECT: generation of a high-frequency single-phase electromagnetic field at the stage of metal melting and double-frequency double-phase electromagnetic field at the stage of electromagnetic mixing of melted metal and its heating with one conversion device, simplification and reduction of losses.