Voltage/current characteristics control circuit particularly for

Details Voltage/current characteristics control circuit particularly for Voltage/current characteristics control circuit particularly for

1991-12-17

1993-05-11

Stephan, Steven L.

Electricity: power supply or regulation systems

Self-regulating

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

323315, 361 79, 361 93, G05F 316

Patent

active

052104818

ABSTRACT:
Voltage/current characteristics control circuit particularly for protecting power transistors, which comprises at least one power transistor; the emitter terminal of a first transistor is directly connected to the output of the power transistor; the emitter terminal of a second transistor is connected to the first terminal of the power transistor by means of a first resistor. The collector terminal and the base terminal of the first transistor are connected to a current source. The base terminal of the first transistor is connected to the base terminal of the second transistor, and the circuit furthermore comprises a protection circuitry. The circuitry is connected to the collector terminal of the second transistor through a differential stage which comprises a third transistor and a fourth transistor; the third transistor and fourth transistor have a respective second resistor and third resistor arranged in series. Divider means are furthermore provided and are interposed between the second terminal of the power transistor and the base terminals of the third transistor and fourth transistor.

REFERENCES:
patent: 4225897 (1980-09-01), Kaplan
patent: 4233556 (1980-11-01), Nagel et al.
patent: 4302792 (1981-11-01), Harwood
patent: 4599578 (1986-07-01), Seevinck
patent: 4680664 (1987-07-01), Leuthen
patent: 4789842 (1988-12-01), Naxera
patent: 4918563 (1990-04-01), Kanai et al.
patent: 5008586 (1991-04-01), Miyazaki et al.

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