SINGLE-PHASE BRIDGE-TYPE TRANSISTOR INVERTER WITH INVERSE DIODE BRIDGE Russian patent published in 2003 - IPC

FIELD: electrical engineering; single-phase bridge-type inverters. SUBSTANCE: novelty is that known device widely used in miscellaneous secondary power supplies for power capacities from tens of watt (domestic video and audio appliances) to several kilowatts (inverter-type electric welding machines, small plasmatrons, and the like) is provided with single-phase bridge-type transistor inverter with inverse diode bridge. Inverter is connected across diagonally opposite dc terminals to power supply and across diagonally opposite ac terminals, to primary winding of matching power transformer through in-series-connected capacitor. Secondary winding of mentioned matching power transformer is coupled with load through diode rectifier and smoothing choke. Mentioned transformer is provided with auxiliary winding whose turn number is twice as small as that of primary winding. Mentioned auxiliary winding is connected across diagonally opposite ac terminals of inverse diode bridge isolated from diagonally opposite ac terminals of bridge-type transistor inverter. Such design has made it possible to return reactive power to power supply during each half-cycle of inverter bypassing capacitor thereby eliminating voltage resonance at any combination of parameters of matching power transformer and capacitor. EFFECT: ability of eliminating voltage resonance in single-phase bridge-type inverter. 1 cl, 3 dwg