Shorted Compensating Winding for AC Direct Component Measurement
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Solution Overview
Problem
Existing current measuring systems struggle to accurately measure the direct component of alternating current when there is a significant disparity between the direct and alternating components, often due to the direct component being masked by noise from the conversion system, especially when the direct component is several orders of magnitude lower than the alternating component.
Innovation Solution
A device featuring a magnetic core with a gap and a magnetic field sensor, coupled with a shorted compensating winding in the form of a single turn or mesh structured tubular conducting ring, which reduces the magnetic flux from alternating components, allowing for precise measurement of the direct component by eliminating the alternating component's influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional current measuring system with feedback control loop is used, then the measuring range is satisfactory for a vast array of applications, but when there is a large disproportion between the direct component and the alternating component of the measured current, the measured signal from the direct component can be at the level of noise of the conversion system, making it impossible to measure the direct component
Solution Approach 1:
The invention extracts and separates the measurement of the direct component from the alternating component by introducing a compensating winding that specifically targets and eliminates the alternating component's magnetic flux, allowing the direct component to be measured independently without being masked by noise
Solution Approach 2:
The compensating winding acts as an intermediary element that mediates between the alternating component and the magnetic field sensor, canceling out the alternating flux before it reaches the sensor and thereby eliminating the noise interference
2Measurement precision
If a very precise measuring system with great measurement resolution is required to measure the direct component when it is several orders of magnitude lower than the alternating component, then the direct component can be measured, but the system complexity increases
Solution Approach 1:
The invention converts the harmful effect of the alternating component's magnetic flux into a beneficial cancellation effect by using the compensating winding to generate an equal and opposite flux, thereby eliminating the need for extremely high measurement resolution
3Reliability
If the measured signal from the direct component is at the level of noise of the conversion system, then measurement is impossible, but adding a compensating winding increases the device complexity
Solution Approach 1:
The compensating winding applies preliminary anti-action by preemptively canceling out the alternating component's magnetic flux before it can interfere with the measurement of the direct component, thereby ensuring measurement reliability
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 enables precise measurement of the direct component of alternating current even when it is significantly lower than the alternating component, enhancing measurement accuracy by significantly reducing noise interference and maintaining the direct component's magnetic field strength.
Implementation Method 1
A device featuring a magnetic core with a gap and a magnetic field sensor, coupled with a shorted compensating winding in the form of a single turn or mesh structured tubular conducting ring, which reduces the magnetic flux from alternating components
Implementation Method 2
a current-carrying wire around which there is located a magnetic core provided with a gap in which a magnetic field sensor with insulated terminals is located
Data Source
AI summary
The invention relates to a device for measuring the direct component of alternating current, applicable in current measuring systems where a low direct component of alternating current and a high amplitude of the alternating component of alternating current occur. The device for measuring the direct component of alternating current comprises a current-carrying wire (1) around which there is located a magnetic core (2) provided with a gap (3) in which a magnetic field sensor (4) with insulated terminals (5) is located and it comprises a shorted compensating winding (6) or (9) which is made in the form of a single turn coil placed on the core (2).