THREE-PHASE BRIDGE TWO-FREQUENCY VOLTAGE 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 voltage inverter includes six transistors, six diodes, six tuned throttles, 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 each of which is shunted with opposite diode; at that, all three single-phase inverters are connected with DC outputs to DC supply, and three tuned throttles are connected with the first outputs to AC outputs; the other outputs of the above throttles are connected to the first outputs of three single-phase active inductance loads forming three-phase active inductance load connected as per star-connected circuit; at that, all transistors are connected in straight direction in relation to polarity of DC supply; at that, each balancing capacitor is parallel connected to one of three single-phase active inductance loads. Three-phase bridge two-frequency voltage inverter is also provided with three circuits each of which consists of capacitor and throttle; at that, to the second outputs of three tuned throttles there connected with the first outputs are three capacitors the second outputs of which are connected to the first outputs of three single-phase active inductance loads. At that, to the first outputs of three above mentioned capacitors there connected with the first outputs are three throttles the second outputs of which are connected to the second outputs 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