Current limiting circuit for high current peripheral drivers

Details Current limiting circuit for high current peripheral drivers Current limiting circuit for high current peripheral drivers

1983-01-10

1985-08-06

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307254, 307300, H03K 1760, H03K 326

Patent

active

045338396

ABSTRACT:
In a peripheral driver circuit a switching output transistor is operated from digital logic control and is provided with a shut off circuit which turns the output transistor off when its collector supply current exceeds its saturation current. A controlled base drive current is generated in a circuit that includes a scaled reference transistor that is operated at the same current density and the same collector voltage as the output transistor at its rated current. The reference transistor base current is amplified in a circuit having a current gain equal to the scaling between the reference and output transistors. Thus the base current applied to the output transistor is related to the driver rated current which ensures that saturation will occur up to at least the rated current and above which the shut off will be effective.

REFERENCES:
patent: 4318011 (1982-03-01), Zeis
patent: 4404478 (1983-09-01), Rischmuller
patent: 4427902 (1984-01-01), Hickman et al.
patent: 4469082 (1984-09-01), Nishitoba et al.

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