REGULATED VOLTAGE CHANGER Russian patent published in 1997 - IPC

FIELD: secondary power supplies. SUBSTANCE: voltage changer has two transistor switches 1, 2, two diodes 3, 4, transformer 6, choke coil 8, filter capacitor 9, rectifier 11, LC filter, compensating capacitor 14, two delay elements 15, 16, control unit 17, error signal amplifier 18, reference voltage supply 19, pulse-position modulator 20, electric isolation unit 21, triggering circuit 22. Under steady state conditions, pulses coming from control unit 17 alternately drive in conduction transistor switches 1, 2. Unlike-polarity voltage pulses are built up across primary winding 7 of transformer 6; waveform of current carried by this winding is corrected by choke coil 8 and that of pulses across transistor switches 1, 2, by capacitor 14; DC component of voltage pulses across switches 1, 2 is separated at capacitor 9 and AC component goes via transformer 6 to rectifier 11 and is passed through LC filter 12. Output voltage of voltage changer is regulated due to modulation of change-over phase of switches 1, 2. EFFECT: improved design. 2 dwg