Current Sensing Circuit High Frequency Magnetic Field Modulation
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Solution Overview
Problem
Current sensing techniques face limitations in non-intrusively measuring currents without disrupting the device under test, particularly in accurately converting magnetic fields into electrical signals for effective monitoring and protection applications.
Innovation Solution
A current sensing circuit comprising a high frequency signal generator, an electromagnetic exchanger, and a demodulation circuit, which generates and modulates magnetic fields to produce a modulated signal for demodulation, enabling accurate current sensing without inserting additional elements into the current path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If non-intrusive current sensing technique is used, then the current path is not disrupted, but the measurement precision is insufficient
Solution Approach 1:
The patent applies magnetic field modulation by superimposing a high-frequency magnetic field onto the current-induced magnetic field. This modulation technique enhances the detectable signal characteristics, enabling more precise measurements without intrusive contact. The high-frequency magnetic field acts as a carrier that carries the current information, improving measurement precision while maintaining non-intrusive operation.
Solution Approach 2:
The patent transforms the current measurement problem into a frequency-domain problem by using high-frequency magnetic field modulation. The current information is encoded in the modulated magnetic field at a different frequency range, allowing for more accurate detection through frequency-based separation and demodulation techniques, thus improving measurement precision without disrupting the current path.
2Measurement precision
If magnetic field conversion to electrical signals is improved, then the sensing accuracy is enhanced, but the device complexity increases
Solution Approach 1:
The patent introduces a high-frequency magnetic field as an intermediary carrier to transfer current information. Instead of directly converting the weak current-induced magnetic field to electrical signals, the system uses the high-frequency magnetic field as a mediator that amplifies and carries the information, enabling more accurate sensing while keeping the conversion circuit relatively simple through standardized modulation and demodulation techniques.
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 solution allows for precise and non-invasive current sensing, enhancing monitoring and protection capabilities by effectively converting magnetic fields into usable electrical signals, thereby addressing the limitations of existing techniques.
Implementation Method 1
The electromagnetic exchanger couples to the high frequency generator, and receives the high frequency signal to generate a high frequency magnetic field
Implementation Method 2
The high frequency magnetic field modulates a magnetic field induced by a current to generate a modulated magnetic field
Implementation Method 3
The electromagnetic exchanger induces the modulated magnetic field to output a modulated signal
Data Source
AI summary
A current sensing circuit comprises a high frequency signal generator, an electromagnetic exchanger, and a demodulation circuit. The high frequency signal generator generates a high frequency signal. The electromagnetic exchanger couples to the high frequency signal generator, and receives the high frequency signal to generate a high frequency magnetic field. The high frequency magnetic field modulates the magnetic field induced by a current to generate a modulated magnetic field. The electromagnetic exchanger induces the modulated magnetic field to output a modulated signal. The demodulation circuit couples to the electromagnetic exchanger, and performs demodulation to output a sensing result according to the modulated signal.