Variable Hall Sensor Current Control for Precision Measurement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current measurement apparatuses face limitations in precision, with higher measurement errors at lower currents due to the inverse proportionality between measurable current and precision, requiring separate devices for high and low current measurements, leading to increased complexity and cost.
Innovation Solution
A current measurement apparatus with variable tuning precision, utilizing a hall element, a variable current source, and a controller that adjusts the current applied to the hall element based on system state, temperature, and current change rate, allowing a single ASIC to include a variable current source, voltage measurer, and controller for improved reliability and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a constant hall sensor driving current is applied to measure current, then the measurement range is fixed, but the measurement precision deteriorates at lower currents due to inverse proportionality between measurable current and precision
Solution Approach 1:
The patent applies dynamics by making the hall sensor driving current variable rather than constant. The controller dynamically adjusts the driving current based on the measured current magnitude: applying higher current for small currents to maximize precision, and lower current for large currents to avoid saturation. This dynamic adjustment resolves the contradiction between maintaining high precision across different current ranges and adapting to varying measurement requirements.
Solution Approach 2:
The patent changes the parameter of hall sensor driving current from a fixed value to a variable value that adapts to the measurement conditions. By modifying this critical parameter based on the current being measured, the system achieves both high measurement precision and broad adaptability, eliminating the need for multiple specialized measurement devices.
2Measurement precision
If separate current measurement apparatuses are employed for high current and low current measurements, then measurement precision is improved for specific ranges, but device complexity increases
Solution Approach 1:
The patent implements universality by designing a single current measurement apparatus that can accurately measure both high and low currents through variable driving current control. The hall sensor-based device performs multiple measurement functions by dynamically adjusting its operating parameters, eliminating the need for separate specialized devices for different current ranges and thereby reducing overall system complexity.
Solution Approach 2:
The patent merges the functionality of multiple current measurement devices into a single apparatus. By combining high-current measurement capability and low-current measurement capability in one device through intelligent current control, the system reduces the total number of components while maintaining or improving measurement precision across all current ranges.
3Measurement precision
If the hall sensor driving current is increased to improve low current measurement precision, then measurement precision is improved, but measurement saturation occurs at higher currents
Solution Approach 1:
The patent applies dynamics by implementing real-time adjustment of the hall sensor driving current based on the measured current magnitude. The controller monitors the current level and dynamically switches between high driving current (for low current measurements with high precision) and low driving current (for high current measurements to prevent saturation). This dynamic control strategy simultaneously improves precision at low currents and maintains reliability at high currents.
Solution Approach 2:
The patent employs feedback control where the measured current information is used to adjust the driving current for the hall sensor. The controller receives feedback about the current magnitude and automatically adjusts the driving current accordingly, ensuring optimal measurement conditions are maintained across the entire current range. This feedback mechanism prevents both precision loss at low currents and saturation at high currents.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables stable and precise current measurement across a wide range of currents without the need for multiple devices, maintaining high precision at low currents and preventing measurement saturation from sudden changes, while minimizing material costs and temperature-related issues.
Implementation Method 1
a hall element provided in a gap formed in a core and outputting a hall voltage by a hall effect
Data Source
AI summary
Provided is a current sensor having variable tuning precision capability depending on an amount of a current to be measured, a system state and the like. In the present disclosure, the current measurement apparatus having variable tuning precision capability does not separately require a current sensor measuring a small current with high precision and a current sensor stably measuring a large current without saturation. In the present disclosure, a single current measurement apparatus may vary current measurement precision depending on a current magnitude and the like, and may thus measure the small current with the high precision and stably measure the large current without saturation.