Hall Sensor Current Measurement with System Information Compensation
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Solution Overview
Problem
Current measurement apparatuses using hall sensors face errors due to hysteresis characteristics of magnetic cores, which cannot be effectively reduced by conventional methods.
Innovation Solution
A current measurement apparatus that includes a current sensing element, a communication unit to receive system information from upper-level controllers, and a correction amount calculation unit to calculate and correct current measurement errors based on this information, thereby outputting more accurate current measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a hall sensor type current measurement apparatus is used to measure current, then the current measurement can be performed non-contactly through the magnetic core, but current measurement errors occur due to hysteresis characteristics of the magnetic core
Solution Approach 1:
The patent applies feedback by using the measured current value to calculate a compensation amount that corrects the hysteresis error. The correction amount calculation unit uses the measured current and system information to determine a compensation value that is fed back to correct the measurement, thereby eliminating the hysteresis effect in the final measurement result.
Solution Approach 2:
The patent changes the measurement parameter by introducing a compensation amount that adjusts the measured current value. By calculating the compensation amount based on system information (such as temperature, frequency, and magnetic core characteristics) and subtracting it from the measured value, the system transforms the inaccurate measurement into an accurate one by modifying the measurement parameter.
2Measurement precision
If system information is used to calculate compensation amount, then current measurement accuracy is improved, but device complexity increases due to additional communication unit and correction calculation unit
Solution Approach 1:
The patent applies universality by making the measurement operation unit perform multiple functions: it not only outputs the measured current value but also calculates the compensation amount and outputs the corrected measurement result. This multi-functionality reduces the need for separate dedicated correction circuits, thereby limiting the increase in device complexity while still improving measurement accuracy.
Solution Approach 2:
The patent uses system information as an intermediary that bridges the gap between the measured current and the corrected current. Rather than directly correcting the measurement, the system information (temperature, frequency, etc.) serves as a mediator to calculate the compensation amount, which then adjusts the measurement result. This intermediary approach allows accuracy improvement without requiring complex direct correction mechanisms.
3Device complexity
If conventional simple circuit is used to measure current from hall element voltage, then device complexity is minimized, but current measurement error due to hysteresis cannot be reduced
Solution Approach 1:
The patent applies self-service by enabling the measurement operation unit to automatically calculate and apply the compensation amount using the measured current and system information. The system serves itself by internally generating the correction without requiring external complex correction circuits, thereby maintaining relative circuit simplicity while improving measurement accuracy.
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
The apparatus reduces current measurement errors and improves accuracy by using system information to correct for hysteresis-related errors, enhancing both noise reduction and time response in current measurement systems.
Implementation Method 1
a hall element 1120 installed in the air gap formed in the magnetic core 1110 to output a hall voltage by a hall effect
Data Source
AI summary
A current measurement apparatus includes: a current sensing element generating a signal according to a current to be measured; a current measurement means measuring an amount of the current to be measured from the signal outputted from the current sensing element; a communication unit receiving system information from at least one upper-level controller; a correction amount calculation unit calculating information on an amount of a corrected current based on the amount of the current to be measured and the system information; and a measurement operation unit outputting the information on the amount of the corrected current to the at least one upper-level controller.