Hall Sensor Bias Regulation for Temperature-Stable Output
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Solution Overview
Problem
Hall effect devices experience significant temperature drift, leading to unacceptable variations in output voltage due to changes in temperature, which complicates their application in various fields by increasing size, complexity, and cost.
Innovation Solution
A Hall effect device with a voltage regulator that maintains a constant voltage at a point within the Hall element between bias terminals, using external resistors in parallel with the Hall element to adjust bias voltages and minimize temperature-induced changes in Hall voltage, thereby reducing sensitivity to temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If additional compensation components are used to reduce temperature drift, then temperature stability is improved, but device complexity increases
Solution Approach 1:
The patent merges the temperature compensation function with the existing biasing circuitry by using a voltage regulator to control the bias voltage across the Hall element. This integration eliminates the need for separate compensation components while maintaining temperature stability, as the regulator dynamically adjusts the bias voltage to counteract temperature-induced resistance changes in the Hall element.
Solution Approach 2:
The voltage regulator operates as a feedback mechanism that monitors and adjusts the bias voltage across the Hall element based on temperature conditions. By dynamically modifying the bias voltage in response to temperature changes, the system compensates for resistance variations in the Hall element, thereby stabilizing the Hall voltage output without requiring additional discrete compensation components.
2Measurement precision
If additional compensation components are used to reduce temperature drift, then measurement precision is improved, but device size increases
Solution Approach 1:
The patent combines the temperature compensation functionality into the existing biasing circuit structure using a voltage regulator. This merging approach maintains measurement precision by stabilizing the Hall voltage against temperature drift while avoiding the need for additional discrete compensation components that would increase the device footprint.
Solution Approach 2:
The voltage regulator serves multiple functions: it provides bias voltage stabilization, temperature compensation, and protection for the Hall element. This multi-functionality eliminates the need for separate compensation components, thereby maintaining compact device size while achieving precise temperature-independent measurements.
3Reliability
If additional compensation components are used to reduce temperature drift, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent integrates temperature compensation into the biasing circuit using a voltage regulator, which reduces the total component count and simplifies the manufacturing process. This merging approach maintains reliability by ensuring stable Hall voltage output across temperature ranges while lowering manufacturing costs through reduced bill of materials and assembly complexity.
Solution Approach 2:
The voltage regulator automatically compensates for temperature-induced resistance changes in the Hall element without requiring external intervention or complex compensation circuits. This self-service mechanism maintains reliable operation across temperature variations while keeping the device simple and cost-effective to manufacture.
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
The solution effectively stabilizes the Hall voltage against temperature changes, reducing drift to acceptable levels, resulting in a smaller, simpler, and cheaper device with minimal need for additional temperature compensation components.
Implementation Method 1
The Lorenz force acting on the majority carriers in the Hall element 102 generates a 'Hall voltage' (VH+ to VH−) in the form of an offset voltage across Hall voltage terminals 108 and 110
Implementation Method 2
Hall effect devices are typically used to sense the presence, and sometimes the magnitude, of a magnetic field
Implementation Method 3
the output voltage (VH+ to VH−) of the Hall element 102 typically varies with the temperature of the Hall element 102. Graphs 120, 122 and 124 in FIGS. 2, 3 and 4, respectively, illustrate this phenomenon, commonly called 'temperature drift'
Data Source
AI summary
A Hall effect device includes a Hall element and a voltage regulator. The Hall element has first and second bias terminals, or nodes. The Hall effect device maintains, or regulates, a voltage at a point within the Hall element between the first and second bias terminals at about a constant voltage level, while generating a Hall effect voltage. In particular embodiments, the Hall effect voltage is, thus, prevented from substantially varying with the temperature of the Hall element.