Dual threshold differential discriminator

Details Dual threshold differential discriminator Dual threshold differential discriminator

1992-03-23

1993-12-28

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307571, 307592, 307584, 307596, H03K 5153, H03K 1716, H03K 1722

Patent

active

052742741

ABSTRACT:
An embodiment of the present invention is a high-side driver comprising a pair of differential input controls each of which are coupled to a pair of comparators having first and second thresholds set at Vddh-1.5 volts and Vddh-2.5 volts, respectively. A logic block in front of a set-reset flip-flop recognizes only signals on the dual-input control lines where one is less than the Vddh-1.5 volt threshold and the other exceeds the Vddh-2.5 volt threshold. If signals on either or both of the dual-input control lines are between Vddh-1.5 volts and Vddh-2.5 volts, the logic block will prevent a change of state of the flip-flop which controls a high-voltage switch transistor connected to a load. The high-side driver further includes an under-voltage lockout to prevent false operation of the high-voltage switch transistor during the initial power up phase.

REFERENCES:
patent: 4950913 (1990-08-01), Kephart
patent: 5099138 (1992-03-01), Fukunaga
patent: 5134322 (1992-07-01), Bourgeois et al.
patent: 5206540 (1993-04-01), de Sa e Silva et al.

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