MULTIPHASE CONVERSION DEVICE FOR INDUCTION HEATING Russian patent published in 2010 - IPC H05B6/04 

FIELD: electricity.

SUBSTANCE: proposed invention relates to conversion equipment and may be used in installations for induction heating and melting of metal. Main circuit of multiphase double-frequency conversion device comprises source of DC voltage, the first and second filter throttles, and also three circuits, every of which is formed by controlled valve, serially with which one of load-inductor windings is connected, being shunted by capacitor, at the same time the first output of DC voltage source is connected with the first output of the first filter throttle, the second output of which is connected to three first outputs of three controlled valves, at the same time the second outputs of three windings of load inductor shunted by capacitors are connected to each other and joined to the first output of the second filter throttle, the second output of which is connected to the second pole of DC voltage source, at the same time load-inductor is made of three windings, two of which are connected accordingly serially, and all three controlled valves are connected directly relative to polarity of DC voltage source. Each winding of load inductor with shunting capacitor is tuned for high frequency of double-frequency field of loading circuit. Parallel to each winding of load inductor there is a serial circuit connected made of capacitance and inductance, own frequency of which is equal to lower frequency of double frequency field of loading circuit. High-frequency and low-frequency multiphase components of electromagnetic field in loading circuit are formed by means of special logic for control of controlled valves, when each controlled valve is repeatedly connected and disconnected and forms packs of phase-shifted high-frequency pulses.

EFFECT: provision of simultaneous generation of high frequency and low frequency multiphase electromagnetic fields.

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