Current sense apparatus and method

Details Current sense apparatus and method Current sense apparatus and method

2005-04-05

2005-04-05

Zarneke, David (Department: 2829)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Magnetic saturation

Reexamination Certificate

active

06876190

ABSTRACT:
A current sense apparatus and method comprises a common drain DMOSFET and a MOSFET connected in series between a high voltage and a low voltage to serve as an output stage. The DMOSFET produces a phase output current, a mirror current mirrored from the phase output current, and a sense voltage. A servo amplifier is connected with the mirror current and sense voltage to produce a current sense signal. Due to the mirror current from the DMOSFET proportional to the phase output current, the current sense apparatus senses the phase output current in a temperature independent manner.

REFERENCES:
patent: 5864227 (1999-01-01), Borden et al.
patent: 5939867 (1999-08-01), Capici et al.
patent: 6046577 (2000-04-01), Rincon-Mora et al.
patent: 6188212 (2001-02-01), Larson et al.

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