High side current monitor with extended voltage range

Details High side current monitor with extended voltage range High side current monitor with extended voltage range

2005-10-18

2005-10-18

Tan, Vibol (Department: 2819)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

C361S093900, C361S091100, C361S091200, C326S127000

Reexamination Certificate

active

06956727

ABSTRACT:
A high side current monitor circuit includes an op amp which is coupled across a sensing element which carries a current Isenseand develops a shunt voltage Vsense. A feedback transistor driven by the op amp output conducts an output current Ioutthrough a resistor to a current output node necessary to make the op amp inputs equal, such that Ioutis proportional to Isense. Ioutis conducted through a resistor to generate a ground-referred voltage proportional to Vsense. When the common mode voltage of Vsenseis greater than the op amp's breakdown voltage, a discrete transistor is connected between the current output node and ground to stand off the voltage across the amp. The monitor circuit is arranged such that it can be powered with a limited fraction of the common mode voltage when used with a discrete transistor, and is self-biased when used without a discrete transistor.

REFERENCES:
patent: 5220207 (1993-06-01), Kovalcik et al.
patent: 5892647 (1999-04-01), Mizoe
patent: 6222922 (2001-04-01), Scott et al.
patent: 6785521 (2004-08-01), Hadjichristos et al.

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