Method for determining the current flowing through a load in a m

Details Method for determining the current flowing through a load in a m Method for determining the current flowing through a load in a m

1994-12-05

1996-07-23

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Calibration

324503, 324537, 307 101, G01R 3500, G01R 3100

Patent

active

055393209

ABSTRACT:
A method of determining a measurement value (U.sub.-- M) utilizes a calibrating operation and a measuring operation together with an operational amplifier (OP) having an output voltage (U.sub.-- A). The measurement value (U.sub.-- M) represents a current (I) flowing through a load (L) in a motor vehicle having a battery. The battery has a terminal of high potential and a terminal of low potential with the difference between the potentials being the battery voltage (U.sub.-- BATT). The load (L) is connected into a load current circuit and a measuring resistor (R.sub.-- M) also is connected into the load current circuit conducting a load current (I) which, in turn, causes a voltage (R.sub.-- M.cndot.I) to drop across the measuring resistor (R.sub.-- M). The method includes the steps of: amplifying the voltage R.sub.-- M.cndot.I across the measuring resistor (R.sub.-- M) utilizing the operational amplifier (OP); performing the calibrating operation with a sequence of substeps; and, performing the measuring operation with a further sequence of substeps to obtain the measurement value (U.sub.-- M). In this way, the previously required balancing of resistors in the calibrating operation can be omitted.

REFERENCES:
patent: 3581198 (1971-05-01), Shoemaker
patent: 4354155 (1982-10-01), Speidel et al.
patent: 5132609 (1992-07-01), Nguyen
patent: 5337013 (1994-08-01), Langer et al.
patent: 5424677 (1995-06-01), Carson

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