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Magnetic Field Based Current Measurement

A technology of magnetic field measurement and current measurement, which is applied in the direction of the magnitude/direction of the magnetic field, measuring devices, measuring electrical variables, etc., and can solve problems such as low energy efficiency

Active Publication Date: 2021-09-14
TEXAS INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this current measurement is energy inefficient and may add unwanted resistance to the current path

Method used

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  • Magnetic Field Based Current Measurement
  • Magnetic Field Based Current Measurement
  • Magnetic Field Based Current Measurement

Examples

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Embodiment Construction

[0013] The present invention relates generally to electronic systems, and more particularly to magnetic field based current measurement. A current measurement system may include two or more magnetic field sensors (eg, fluxgate sensors) arranged in a predetermined arrangement relative to at least one current conductor (eg, a metal trace on a printed circuit board (PCB)). As an example, the magnetic field sensors may be arranged in an equidistant and symmetrical arrangement with respect to the cross-section of the current conductor(s). The magnetic field sensor is configured to measure the magnetic field associated with the current conductor(s).

[0014] The current measurement system also includes a current measurement processor configured to receive magnetic field measurements associated with the current conductor(s). Accordingly, the current measurement processor may implement a mathematical calculation to calculate the current amplitude in each of the current conductor(s) t...

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Abstract

The present invention relates to magnetic field based current measurement. One example includes a current measurement system (10). The system includes at least two magnetic field sensors (14) positioned proximate to and in a predetermined arrangement relative to a current conductor (12), each of the magnetic field sensors (14) being configured to measure and A current flowing in the current conductor (12) is associated with a magnetic field and provides a corresponding magnetic field measurement. The system also includes a current measurement processor (16) configured to implement a mathematical algorithm based on a Taylor series expansion of the magnetic field measurements to calculate an amplitude of the current based on the mathematical algorithm.

Description

technical field [0001] The present invention relates generally to electronic systems, and more particularly to magnetic field based current measurement. Background technique [0002] In electronic circuits, current is measured for various reasons. For example, current may be measured to implement circuit functions, or may be implemented for circuit protection to mitigate damage to electronic devices in associated electronic circuits. Current can be measured in various ways. One example involves measuring the voltage across a resistor in the current path of the current to be measured via Ohm's law. However, this current measurement is energy inefficient and may add unwanted resistance to the current path. Another way of measuring current is based on measuring the magnetic field in a non-contact manner. In a magnetic field-based non-contact current sensor, current flow through a current conductor (such as a metal trace) generates a magnetic field that is detected by the ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00G01R33/02
CPCG01R19/00G01R33/02G01R15/185G01R15/207G01R15/148
Inventor A·波利斯里纳特·拉马斯瓦米巴赫尔·S·哈龙
Owner TEXAS INSTR INC