Solid state current limit circuit

Details Solid state current limit circuit Solid state current limit circuit

1975-03-27

1976-05-25

Goldberg, Gerald

Electricity: power supply or regulation systems

Remote sensing

323 68, 317 23, 317 33VR, 317 40R, G05F 158

Patent

active

039597130

ABSTRACT:
A current limit circuit is disclosed for sensing the current drain of a load connected in series therewith. Under normal operating conditions the circuit presents a relatively low impedance in series with the load. Circuit overload protection is provided if the current increases above a predetermined value by a current limiting circuit provided for limiting the current conducted therethrough. In response to the current limiting condition, thermal shutdown of the circuit occurs to reduce the current that is supplied to the load to a predetermined minimum value i.e., the current limit circuit presents an impedance to the load which is relatively much greater than the impedance of the current limit circuit during normal operating conditions. After a predetermined time, the current limit circuit is again rendered operative and if the circuit overload condition is still present the aforedescribed cycle is repeated until the fault condition is corrected.

REFERENCES:
patent: 3599079 (1971-08-01), Ansbro et al.
patent: 3691426 (1972-09-01), Mankovitz
patent: 3697860 (1972-10-01), Baker
patent: 3723774 (1973-03-01), Rogers
patent: 3753078 (1973-08-01), Hiedel
Electronics, Dec. 6, 1973; Vol. 46, No. 25; "Temperature Limiting Boosts Regulator Output Current" by M. J. Shah, pp. 112, 113.

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