Method and circuit arrangement for current measurement
First Claim
1. A method for current measurement at a potential which is at a higher value than zero potential, comprising:
- measuring the current value in the form of an analog signal;
transmitting the measured information, after A/D conversion, in the form of a digital signal to an evaluation unit which is at ground potential, wherein characterized in that the analog signal is subjected to compression before A/D conversion and transmission, and the digital signal is subjected to expansion after transmission at ground potential.
1 Assignment
0 Petitions
Accused Products
Abstract
A method with corresponding circuit arrangement is disclosed, whereby for evaluation of a measured signal arising as an analogue value with a potential greater than zero potential in a measuring device requiring a supply current, the measured information therefrom is transmitted as a digital signal to an analytical unit lying at earth potential after an A/D conversion. The generated digital signal thus provides the clock signal for a modulation of the supply current and thus also carries out the function of the carrier for the information content of the measured signal. Curved characteristic lines for compression/decompression of the signals are used. Suitable devices for temperature compensation may be similarly provided.
-
Citations
20 Claims
-
1. A method for current measurement at a potential which is at a higher value than zero potential, comprising:
-
measuring the current value in the form of an analog signal;
transmitting the measured information, after A/D conversion, in the form of a digital signal to an evaluation unit which is at ground potential, wherein characterized in that the analog signal is subjected to compression before A/D conversion and transmission, and the digital signal is subjected to expansion after transmission at ground potential. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
-
18. A circuit arrangement for current measurement at a shunt, at a potential which is at a higher value than zero potential, wherein a voltage drop is evaluated as a measure of the current after amplification, the circuit arrangement comprising:
-
an amplifier for amplifying a voltage signal that is tapped off at the shunt;
an analog/digital converter for converting the amplified signal subjected to compression before A/D conversion;
an evaluation unit, which is at ground potential, wherein the digital signal is subjected to expansion after transmission at ground potential; and
means for performing the compression and expansion. - View Dependent Claims (19, 20)
-
Specification