POWER SUPPLY INCORPORATING OVERLOAD PROTECTIVE GEAR Russian patent published in 2002 - IPC

FIELD: electrical engineering; power supplies for automatic control and computer engineering. SUBSTANCE: power supply that has ac-to-dc converter 1, power amplifier 5, output transformer 6, rectifier 7, and ripple filter 8 is provided, in addition, with analog comparator 13, error signal amplifier 14, delay unit 15, reference-voltage source, and analog voltage selector switch 16. The latter opens upon occurrence of overload in case overcurrent time period exceeds operating time of delay unit and reference voltage level of error signal amplifier 14 reduces. Amplifier starts functioning in active mode, Its output voltage is applied to input of control unit 12 which provides for maintaining power supply current at level corresponding to rated value. In case of short-circuit control unit 12 functions to maintain power supply current at level corresponding to its starting value. EFFECT: enhanced reliability. 4 cl, 4 dwg