Current sensing circuit

Details Current sensing circuit Current sensing circuit

1997-07-31

1999-02-02

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

External effect

Temperature

327512, 327262, 327362, 327 83, H01C 713

Patent

active

058670548

ABSTRACT:
A current sensing circuit which provides for accurate in-line current sensing with extremely low insertion loss. A low valued resistor (e.g., 0.005 ohms) is connected in series with the source and load of the current to be measured. An analog-to-digital converter (ADC) is used to measure the resulting voltage generated across the resistor. In order to minimize inaccuracies due to voltage offsets introduced by the measurement circuitry when measuring the low voltages generated across such a low resistance, the ADC is "chopped," thereby causing self cancellation of any such offset voltages. A voltage source which provides a reference voltage for the ADC has a temperature coefficient which is approximately equal in magnitude to the temperature coefficient of the resistor. Hence, for a given current through the resistor, the reported voltage as measured across the resistor remains constant over temperature.

REFERENCES:
patent: 4517511 (1985-05-01), Suto
patent: 4928200 (1990-05-01), Redl et al.
patent: 5198701 (1993-03-01), Davies et al.
patent: 5534788 (1996-07-01), Smith et al.

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