CONVERSION DEVICE FOR INDUCTION HEATING BASED ON PARALLEL BRIDGE RESONANT INVERTER AND METHOD TO CONTROL CONVERSION DEVICE FOR INDUCTION HEATING BASED ON PARALLEL BRIDGE RESONANT INVERTER Russian patent published in 2012 - IPC H05B6/00 H05B6/04 H05B6/10 H02M7/521 H02M7/523 H02M7/5387 

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.

2 cl, 2 dwg