SINGLE-PHASE TRANSISTOR BRIDGE INVERTER Russian patent published in 2003 - IPC

FIELD: electrical engineering; transformer-loaded single-phase inverters for secondary power supplies of various electrical installations. SUBSTANCE: proposed single-phase inverter has series- connected capacitor inserted in primary winding circuit of matching power transformer and is provided with auxiliary reactive-power return winding connected across diagonally opposite terminals of backward diode bridge; transistor switch connected between one of backward diode bridge poles and like pole of power supply in conductive direction relative to mentioned diode bridge has its control input coupled with AND circuit incorporated in two optocouplers and with resistive voltage divider; light-emitting diodes of mentioned optocouplers are cumulatively interconnected in series and integrated through common point with one of ac diagonal vortices of mentioned transistor bridge; optocoupler leads are connected through current-limiting resistors to power supply poles in conductive direction; photodiodes of mentioned optocouplers are cumulatively interconnected in series; anode of one of photodiodes is connected to control input of transistor switch and cathode of other photodiode, to common point of mentioned resistive voltage divider incorporated in two series-connected resistors whose leads are connected in parallel with mentioned transistor switch. EFFECT: provision for eliminating voltage resonance in transistor bridge inverter. 1 cl, 2 dwg