THREE-PHASE DOUBLE-FREQUENCY VOLTAGE INVERTER WITH ZERO LEAD FOR INDUCTIVE HEATING (VERSIONS) Russian patent published in 2012 - IPC H02M7/42 H02M7/53 H02M7/487 H05B6/04 

FIELD: electricity.

SUBSTANCE: three-phase double-frequency voltage inverter with zero lead consist of three on-phase single-ended inverters; each inverter includes preset inductor choke, single-phase active inductive load and balancing capacitor connected in series. All inverters are connected to DC source and form three single-phase active-inductive loads for three-phase active-inductive load connected by star scheme. All transistors are switched directly in regard to DC source polarity and shunted by opposite diodes, and single-phase active-inductive loads are shunted by balancing capacitors. Three-phase double-frequency voltage inverter with zero lead is equipped additionally with three circuits; each circuit consists of capacitor and choke, at that capacitor is connected to each circuit between transistor and active-inductive load and choke is switched in parallel to the circuit formed in series by the above capacitor and active-inductive load.

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

2 cl, 2 dwg