THREE-PHASE BRIDGE TWO-FREQUENCY CURRENT INVERTER FOR INDUCTION HEATING (VERSIONS) Russian patent published in 2011 - IPC H02M7/42 H02M7/53 H02M7/53862 H02M7/5387 H05B6/02 

FIELD: electricity.

SUBSTANCE: three-phase bridge two-frequency current inverter includes DC voltage supply, two input throttles, six transistors, six diodes, three single-phase active inductance loads and three balancing capacitors; at that, three-phase inverter consists of three single-phase inverters, each of which includes two first and second in-series connected transistors; at that, diode is connected in series to each of them; at that, the first dc outputs of three single-phase inverters are connected to the second output of the first input throttle the first output of which is connected to the first pole of DC voltage supply; the second DC outputs of the three above mentioned single-phase inverters are connected to the first output of the second input throttle the second output of which is connected to the second pole of DC voltage supply. At that, three-phase active inductance load consisting of three single-phase active inductance loads and connected as per start-connected circuit is connected to AC outputs; at that, all transistors are connected in straight direction in relation to polarity of DC voltage supply; at that, each balancing capacitor is parallel connected to one of three single-phase active inductance loads.

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

3 cl, 3 dwg