ONE-PHASED TRASNFORMATION DEVICE ON ALTERNATING-ALTERNATING CURRENT FOR INDUCTIVE HEATING Russian patent published in 2007 - IPC H05B6/04 

FIELD: transformation equipment, possible use for inductive heating and melting of metals and alloys.

SUBSTANCE: in accordance to the invention, device contains two identical single transformation devices having input and output contacts, while their input contacts are connected to powering supply of alternating voltage, and output contacts are connected to load contours, each one of which is formed by actively inductive inducer-load, bridged by compensating capacitor. Each single transforming device, for example, first one, consists of 4 fully controllable rectifying cells. First two rectifying cells - 1st and 2nd ones are connected to different contacts of alternating voltage power supply, while aforementioned rectifying cells are connected serially in straight direction relatively to positive polarity of, for example, first semi-period of powering alternating voltage, and connected to load contour in such a way, that on their opening voltage of one, for example, positive, polarity is fed onto load contour during each first semi-period of powering alternating voltage to generate first semi-period of low frequency current. Second two of aforementioned fully controllable rectifying cells - 3d and 4th - are also connected to different contacts of alternating voltage power supply, and aforementioned rectifying cells are also connected serially in straight direction relatively to positive polarity of the same first semi-period of powering alternating voltage and connected to load contour in such a way, that on their opening voltage of same, but negative, polarity is fed into loading contour during each first semi-period of powering alternating voltage to generate second semi-period of low frequency current. Second identical single transformation device is connected to powering source of alternating voltage and to first device in such a way, that during each second, i.e. negative semi-period of powering alternating voltage, voltage of positive and negative polarities is fed onto its load contour to generate semi-periods of low frequency current of different polarity.

EFFECT: possible generation of double-frequency system of currents in inducer-load, equal to frequency of powering alternating voltage, where frequency of low frequency component of inducer-load current is at least several times lower than frequency of powering alternating voltage.

2 cl, 1 dwg