Over-current protection circuit for voltage regulator

Details Over-current protection circuit for voltage regulator Over-current protection circuit for voltage regulator

1977-04-21

1978-11-28

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

H02H 720

Patent

active

041278852

ABSTRACT:
A control transistor in the over-current protection circuitry of a voltage regulator is connected in a regenerative latch circuit with a complementary-conductivity auxiliary transistor, whereby conduction once initiated in said control transistor tends to be sustained. This avoids the tendency towards rapid oscillation between shut-down and power-up conditions in the over-current protection circuitry. The regenerative latch circuit loads the capacitor that supplies its sustaining current so heavily that the potential thereacross decays, the decay finally advancing to the point where regeneration halts. The resulting non-conduction of the control transistor permits the voltage regulator to attempt to resume the power-up condition. The present invention is an improvement in such a voltage regulator wherein circuitry is provided for rapidly recharging the capacitor for supplying sustaining current during this attempt. The recurrence of this cycle during short-circuit loading conditions leads to a relaxation oscillator mode of operation with the power-up duty cycle being sufficiently low that the components of the voltage regulator are kept from being damaged by overheating.

REFERENCES:
patent: 3988643 (1976-10-01), Morris
patent: 4013925 (1977-03-01), Tice et al.
patent: 4017789 (1977-04-01), Morris

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