STABILIZED CONSTANT-TO-VARIABLE VOLTAGE CONVERTER Russian patent published in 1994 - IPC

FIELD: high vision devices. SUBSTANCE: stabilized constant-to-variable voltage converter includes transformer with first 1 and second 2 windings. First winding 1 is connected in series with generating transistor 3 between first and second leads-out 4, 5 for connection of power supply source. Source 6 of reference voltage, diode 7, field-effect transistor 8, limiting element 9 and second winding 2 are connected in series between first and second leads-out 4, 5. Two analogous leads-out of limiting element 9 and additional diode 10 are tied together and two analogous leads-out opposite to them are coupled correspondingly to source and gate of field-effect transistor 8. First lead-out of resistor 12 is linked to one lead-out of capacitor 11 and second lead-out of resistor 12 is coupled to first lead-out 4 for connection of power supply source or to other lead-out of capacitor 11. Additional diode 10, second winding 2 and first capacitor 11 form series closed circuit. Second capacitor 13 is placed between drain of field-effect transistor 8 and limiting element 9. Controlling electrode of generating transistor 3 is linked to drain of field-effect transistor 8 and through diode 7 and source 6 of reference voltage - to first lead-out 4 for connection of power supply source. Resistor 14 is connected in parallel to limiting element 9 and source 6 of reference voltage presents transistor 15 and third capacitor 16 coupled in parallel. Controlling electrode of transistor 15 is connected to one of windings 1, 2 via negative feedback circuit. EFFECT: improved operational efficiency. 3 cl, 2 dwg