THREE-PHASE DOUBLE-FREQUENCY CURRENT INVERTER WITH ZERO OUTPUT FOR INDUCTION HEATING Russian patent published in 2010 - IPC H05B6/04 

FIELD: electricity.

SUBSTANCE: three-phase double-frequency current inverter consists of input throttle and three single-phase single-step inverters, every of which comprises serially connected transistor, diode, single-phase active-inductance load and compensating capacitor, at the same time all single-phase inverters with the first outputs of transistors are connected to the second output of input throttle, the first output of which is connected to the first pole of DC voltage source, and with the second outputs of single-phase active-inductance loads, inverters are connected to the second pole of DC voltage source to form three-phase active-inductance load, connected as "star", at the same time all transistors are connected straight relative to polarity of DC voltage source, diodes are connected in accord and serially with transistors, and single-phase active-inductance loads are shunted with compensating capacitors. Three-phase double-frequency current inverter is additionally equipped with three circuits, every of which consists of capacitor and throttle, at the same time in each circuit capacitor is connected between diode and active-inductance load, and throttle is connected parallel to circuit formed by serially connected mentioned capacitor and active-inductance load.

EFFECT: simultaneous generation of high-frequency and low-frequency three-phase electromagnetic fields and simplification.

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