Current limit circuit for power supply regulators

Details Current limit circuit for power supply regulators Current limit circuit for power supply regulators

1991-03-19

1994-06-07

Gregory, Bernarr E.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323277, 361 79, G05F 1575

Patent

active

H00013196

ABSTRACT:
Most power supply regulators either cause the output voltage to drop-off gradually, or caused output oscillation upon reaching or exceeding the limit current. Current limit feedback to an error amplifier within a switching regulator is used to control the output voltage, prevent oscillation, insure that current limiting does not occur until a well-defined threshold is achieved and then steeply limit the current. The circuit uses feedback to the switching regulator to maintain the output voltage within desired limits. The output current flows through the current limit resistor R.sub.c thus providing a voltage proportional to the current at the base-emitter junction of Q.sub.1 via CR.sub.1 and R.sub.2. During normal operation, the forward biased CR.sub.1 voltage maintains a reverse bias on the B-E junction of Q.sub.1. When the voltage across R.sub.c exceeds the forward bias on CR.sub.1, Q.sub.1 turns on, hence turning on Q.sub.2, thus providing its contribution to the current limit feedback circuitry for use by the switching regulator.

REFERENCES:
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patent: 4180768 (1979-12-01), Ferraro
patent: 4335345 (1982-06-01), Converse

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