Pin Configurable Smart Current Sensor Using Segmented Hall Effect Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current sensors, particularly Hall Effect sensors, face challenges in accurately measuring and regulating large currents in electrical systems, especially in applications requiring precise control and protection against reverse currents and temperature variations.
Innovation Solution
A system incorporating at least two Hall Effect sensors, a control unit, and a sensing circuitry that monitors current flow through a conductive element, enabling the regulation of a contactor unit to manage power generation and consumption, including features for temperature protection, reverse current detection, and remote user control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single Hall Effect sensor is used to measure current, then the device complexity is low, but the measurement precision and reliability for large currents deteriorates
Solution Approach 1:
The current measurement function is segmented across multiple Hall Effect sensors (first and second sensors) that independently measure different portions of the magnetic field. Each sensor provides separate measurement signals that are processed individually before being combined, allowing for higher precision measurements of large currents while distributing the complexity across modular sensing channels rather than requiring a single complex sensor
2Reliability
If multiple Hall Effect sensors are used to improve measurement accuracy, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The control unit processes measurements from multiple sensors through segmented functional blocks: individual signal conditioning for each sensor, separate processing paths for different measurement types (current, power, energy), and modular protection functions. This segmentation allows reliable current sensing through multiple sensors while organizing complexity into manageable, independent processing modules rather than a monolithic complex system
Solution Approach 2:
The control unit is designed with multi-functionality to handle diverse tasks: it processes current measurements from multiple Hall Effect sensors, calculates power and energy parameters, implements overload protection, detects reverse currents, and provides temperature compensation. This universal control unit consolidates multiple functions into a single integrated device, improving reliability through redundant sensing while avoiding the proliferation of separate dedicated circuits for each function
3Reliability
If the contactor unit operates without protection, then the ease of operation is high, but the reliability under varying conditions deteriorates
Solution Approach 1:
The control unit continuously monitors current measurements from the Hall Effect sensors and proactively detects potential overload conditions, reverse currents, and temperature variations before they cause damage. Protection actions are initiated in advance based on predetermined thresholds and I2t calculations, preventing harmful effects rather than responding after failure occurs. This preliminary protective action ensures reliable operation under varying conditions while keeping the protection logic integrated into the existing control unit rather than requiring separate complex protection circuits
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
Enables precise regulation of current flow, protects against overloads and reverse currents, and allows for remote monitoring and control, ensuring reliable operation of electrical loads even under varying conditions.
Implementation Method 1
Hall Effect current sensors generate a voltage in response to a magnetic field generated by a current
Data Source
AI summary
A method of regulating the operation of an electrical system, the electrical system including, a contactor unit including a contactor and a conductive element, sensing circuitry including at least two Hall Effect sensors, and a control unit including at least a trip circuit, an I2t unit, and a one coil current monitor. The method includes receiving, by the control unit, one or more first measurements, from the sensing circuitry and determining, by the control unit, a current corresponding to a current in the at least one conductive element based on the one or more first measurements. The control unit also determines an instantaneous power generated by a load based on the current and regulates the operation of the contactor unit based on the power generated by the load.