Current Sensor Shunt Circuit for High-Frequency AC Diagnostics
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Solution Overview
Problem
Existing current measurement systems for AC currents have limited sensitivity to frequency components higher than the fundamental frequency, which hampers accurate diagnosis and monitoring of apparatus conditions.
Innovation Solution
The current measurement system incorporates a current sensor with a measurement coil magnetically coupled to the conductor and a shunt resistor connected across the measurement coil, allowing for improved sensitivity to frequency components above the fundamental frequency by setting the saturation frequency higher than the upper limit of the measurement range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional current measurement system is used, then the measurement is simple and straightforward, but the sensitivity to frequency components higher than the fundamental frequency is limited
Solution Approach 1:
The patent changes the electrical parameters of the measurement system by introducing a shunt resistor with specific resistance value and configuring the output impedance of the current sensor. By adjusting these electrical parameters, the system extends its frequency response range and improves sensitivity to higher frequency components while maintaining a relatively simple overall structure.
2Adaptability or versatility
If the measurement range upper limit is increased to capture higher frequency components, then the diagnostic capability is improved, but the system becomes more complex
Solution Approach 1:
The patent extends the measurement range by modifying electrical parameters - specifically by adding a shunt resistor and adjusting output impedance - rather than by adding complex frequency analysis hardware. This allows the system to accurately measure and diagnose higher frequency components while keeping the structural complexity low.
3Measurement precision
If the saturation frequency is increased to improve high-frequency sensitivity, then the measurement accuracy for harmonics is improved, but the system complexity increases
Solution Approach 1:
The patent raises the saturation frequency by changing electrical parameters of the current sensor - specifically by configuring the output impedance and introducing a shunt resistor with appropriate resistance value. This allows the sensor to maintain linear response at higher frequencies without requiring complex sensor design modifications.
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
This configuration enhances the system's sensitivity to higher frequency components, enabling more accurate detection of changes in apparatus conditions, such as abnormalities or unidentified conditions, without interrupting the apparatus's operation.
Implementation Method 1
a measurement coil configured to be magnetically coupled to the conductor
Implementation Method 2
The shunt resistor has both ends electrically connected to both ends of the measurement coil, respectively. An output voltage across the both ends of the shunt resistor
Data Source
AI summary
A current measurement system is configured to measure an alternating-current (AC) current flowing through a conductor. The AC current has a frequency within a measurement range. The system includes a current sensor and a shunt resistor. The current sensor includes a measurement coil configured to be magnetically coupled to the conductor. The shunt resistor has both ends electrically connected to both ends of the measurement coil, respectively. An output voltage across the both ends of the shunt resistor is saturated at a saturation point in a saturation frequency of the frequency of the AC current. An upper limit value of the measurement range including the frequency is higher than a fundamental frequency of the AC current. The saturation frequency is higher than or equal to the upper limit value. The current measurement system improves sensitivity to frequency components higher than the fundamental frequency of the AC current.