Current limited power semiconductor device

Details Current limited power semiconductor device Current limited power semiconductor device

1992-12-04

1993-12-21

Wambach, Margaret R.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

3072992, 307546, 307310, 307318, 307491, 361 91, 361 93, 361100, 361101, H03K 301, H03K 326

Patent

active

052723925

ABSTRACT:
A current limit circuit for protection of an intelligent power switch includes a series circuit of a sense transistor and a sense resistor coupled to the power semiconductor transistor switch so that the sense resistor current is a fraction of, and is proportional to, the power transistor current. A pull-down transistor is coupled to the control electrode of the power transistor switch. A feedback circuit including a series connection of a diode-connected transistor and a reference V source is coupled between the sense resistor and the control electrode of the pull down transistor. The feedback circuit produces a voltage level shift and the circuit provides an accurate limit on the power transistor current independent of any variations in threshold voltage.

REFERENCES:
patent: 5061863 (1991-10-01), Mori et al.
patent: 5184272 (1993-02-01), Suda et al.

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