POWER SUPPLY WITH OVERLOAD PROTECTIVE GEAR Russian patent published in 2005 - IPC

FIELD: converter engineering; regulated limited-load-current secondary power supplies with overcurrent and short-circuit protective gear.

SUBSTANCE: proposed power supply has input terminals connected to inputs of power amplifier whose output is connected through current transformer primary winding to primary winding of power transformer, extreme leads of secondary winding of the latter being connected to input of power rectifier; it also has ripple filter whose inputs are connected to outputs of power rectifier; outputs of ripple filter are connected to output terminals and to extreme leads of voltage divider; center tap of voltage divider is connected to first control input of control unit whose first output is connected to first control input of power amplifier and second input, to second control input of power amplifier. Extreme leads of current-transformer secondary winding are connected to load resistor and to rectifier inputs and center tap, to second output terminal. Rectifier output is connected through filter circuit and resistor to first input of error signal amplifier of overload protection channel and to first output of resistor. Second input of error signal amplifier in overload protection channel is connected to output of reference voltage source and output, to second control input of control unit through diode. Second output of resistor is connected through voltage regulator diode to wiper of potentiometer whose extreme leads are connected to lead of insulating amplifier 22 whose input is connected through input voltage divider to input terminals.

EFFECT: enhanced reliability of protective gear.

3 cl, 3 dwg