Current measurement circuit, current detection circuit and...

Details Current measurement circuit, current detection circuit and... Current measurement circuit, current detection circuit and...

Filed on

2011-08-09

Date issued

2011-08-09

Examiner

Nguyen, Hoai-An D (Department: 2858)

Patent Class

Electricity: measuring and testing

SubClass

Measuring, testing, or sensing electricity, per se

Other Related Categories

C324S522000

Type

Reexamination Certificate

Status

active

Patent number

07994771

Description

ABSTRACT:
A current measurement circuit includes: a constant-voltage loop circuit including an operational amplifier, and a first resistor for current detection connected to an output of the operational amplifier, the output of the operational amplifier being fed back to an inverting input terminal of the operational amplifier via the first resistor; a differential amplifier for current detection with an input of a voltage between both ends of the first resistor; and a saturation prevention and recovery circuit connected to the both ends of the first resistor for preventing saturation of the operational amplifier and/or accelerating recovery from the saturation thereof.

REFERENCES:
patent: 4402030 (1983-08-01), Moser et al.
patent: 5371469 (1994-12-01), Anderson
patent: 5886581 (1999-03-01), Hugel et al.
patent: 6465933 (2002-10-01), North, Jr.
patent: 2009/0084677 (2009-04-01), Kawase et al.
patent: 63-082377 (1988-04-01), None

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