Current Sensor Switching Magnetic and Shunt Detection
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Solution Overview
Problem
Current sensors, such as magnetic proportional and balance sensors, face limitations in measurement range and accuracy due to magnetic saturation and power supply constraints, requiring separate sensors for different current ranges, which complicates manufacturing and space usage.
Innovation Solution
A current sensor that switches between magnetic detection and shunt resistance detection based on current magnitude, using a magnetic sensor and a shunt resistor connected in series, with a switching unit to select the appropriate detection method for small and large currents, allowing for high accuracy and a wide measurement range in a single device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic detection is used for small current measurement, then measurement accuracy is improved, but measurement range is limited
Solution Approach 1:
The current sensor dynamically switches between magnetic detection mode (for small currents with high accuracy) and shunt resistance detection mode (for large currents with wide range) based on the magnitude of the current being measured. This dynamic adaptation allows the system to maintain high measurement accuracy while extending the overall measurement range.
Solution Approach 2:
The current sensor is designed to perform multiple functions: it can detect small currents with high accuracy using magnetic detection, and detect large currents using shunt resistance detection. By integrating both detection methods into a single device with switching capability, the sensor achieves universality across different current ranges.
2Measurement precision
If separate current sensors are used for small and large current measurements, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent merges magnetic detection functionality and shunt resistance detection functionality into a single current sensor device. The switching unit integrates both detection paths and selectively activates them based on current magnitude, eliminating the need for separate sensors and reducing overall system complexity.
Solution Approach 2:
A single current sensor is designed to handle both small and large current measurements by incorporating multiple detection methods. This multi-functional design replaces what would traditionally require separate specialized sensors, simplifying the overall device configuration.
3Measurement precision
If separate current sensors are used for different current ranges, then measurement accuracy is improved, but space consumption increases
Solution Approach 1:
The patent combines magnetic detection components and shunt resistance detection components into a single integrated current sensor package. This merging eliminates the need for multiple separate sensor installations, thereby reducing the total space required while maintaining high measurement accuracy across different current ranges.
Solution Approach 2:
A single multi-functional current sensor replaces what would traditionally require multiple separate sensors for different current ranges. This universal sensor handles both small and large currents, significantly reducing the space consumption associated with having separate dedicated sensors for each current range.
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 enables high accuracy at low currents and widens the measurement range while achieving space savings by using a single sensor for both small and large current measurements, reducing power consumption and simplifying manufacturing.
Implementation Method 1
a magnetic sensor whose characteristics are changed by an inducted magnetic field from a current to be measured
Implementation Method 2
a shunt resistor that is connected in series with a current line for circulating the current to be measured
Data Source
AI summary
A current sensor includes a magnetic balance sensor including a feedback coil that is disposed in the vicinity of a magnetic sensor element whose characteristics are changed by an inducted magnetic field from a current to be measured and generates a cancellation magnetic field for offsetting the inducted magnetic field, a shunt resistant that is connected in series with a current line for circulating the current to be measured, and a switch circuit that switches to magnetic balance detection at the time of a small current and switches to shunt resistance detection at the time of a large current.