Electricity: electrical systems and devices – Safety and protection of systems and devices – Voltage regulator protective circuits
Patent
1975-12-08
1977-05-03
Miller., J.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Voltage regulator protective circuits
330207P, 361103, H02H 720
Patent
active
040217019
ABSTRACT:
The disclosed protection circuit which is suitable for providing protection of transistors included in integrated circuits such as regulators and power amplifiers, includes thermal shutdown, safe area and current control circuits. The current control portion includes a sense transistor connected substantially in parallel with the transistor to be protected. In monolithic integrated circuit applications, the sense transistor has an emitter area that is a predetermined ratio of the emitter area of the protected transistor. A "sense resistor" is connected to the sense transistor and develops a control signal which is proportional to the instantaneous current being conducted by the protected transistor. A threshold circuit is coupled between the sense resistor and the drive circuit for the protected transistor and responds to the magnitude of the control signal crossing a predetermined threshold to remove or reduce the drive to the protected transistor.
REFERENCES:
patent: 3527997 (1970-09-01), Nercessian
patent: 3571660 (1971-03-01), Phillips
patent: 3577035 (1971-05-01), Constable
patent: 3597655 (1971-08-01), Forte
patent: 3755751 (1973-08-01), Ring
patent: 3845405 (1974-10-01), Leidich
patent: 3896393 (1975-07-01), Cave et al.
patent: 3906310 (1975-09-01), Esashika
patent: 3916263 (1975-10-01), Abbott
Jones, Jr. Maurice J.
Miller. J.
Motorola Inc.
Salce Patrick R.
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