SUPPLY MAINS RECTIFIER FOR INVERTER-TYPE SECONDARY POWER SUPPLIES Russian patent published in 2003 - IPC

FIELD: electrical engineering, inverter-type single-phase secondary power supplies. SUBSTANCE: novelty is that control system of known device that has its power section incorporating supply mains semiconductor bridge rectifier is made in the form of NOR gate as part of three optoelectronic isolators and transistor switch, mentioned transistor switch being connected in conductive direction between gate electrodes of supply mains semiconductor bridge rectifier thyristors and common cathodes of these thyristors; gate electrodes of mentioned thyristors and control input of mentioned transistor switch are shorted out in nonconductive direction by photodiodes of three mentioned optoelectronic isolators so that photodiodes of first and second optoelectronic isolators are connected to shortedout points through break contacts of relay monitoring voltage across filter capacitor; one of two photodiodes of third coupled optoelectronic isolator is connected directly to shorted-out points; anodes of light-emitting diodes of first and second optoelectronic isolators are connected through ballast resistor to plus lead of diode bridge; cathodes of light-emitting diodes of first and second optoelectronic isolators are connected to their respective R-C shaping circuits; supply voltage monitoring relay coil is connected to supply mains and loose leads of capacitors and discharge resistors are integrated with common minus lead of mentioned diode bridge and supply mains semiconductor bridge rectifier; both light- emitting diodes of third coupled optoelectronic isolator are cumulatively connected in series and coupled through respective output of device protective system; common point of gate electrodes of supply mains semiconductor bridge rectifier thyristors is connected to cut-off diode cathode, anode of this diode being coupled through additional current-limiting resistor with common cathodes of mentioned diode bridge and with cathode of voltage regulator diode whose anode is integrated with anodes of two isolating diodes whose cathodes are connected to one of R-C shaping circuits. Replacing power supply and synchronizing unit, as well as pulse-phase control system by simple logic circuit has made it possible to greatly simplify device as a whole. EFFECT: simplified design of supply mains rectifier control system for inverter-type secondary power supplies. 1 cl, 3 dwg