Hall Sensor Series Branches Counteract Current Flow
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Solution Overview
Problem
Existing Hall sensors face challenges in achieving high magnetic sensitivity while minimizing current flow and reducing interference from offset voltages and heating.
Innovation Solution
A Hall sensor design featuring multiple series-connected Hall elements with specific terminal contact configurations and current flow directions, forming branches that counteract each other's current flow, and utilizing symmetrical arrangements to enhance sensitivity and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple Hall elements are connected in series to increase magnetic sensitivity, then the magnetic sensitivity increases, but the current load increases causing more heating and interference
Solution Approach 1:
The Hall sensor is divided into two separate branches (first branch and second branch), each containing series-connected Hall elements. This segmentation allows the total sensitivity to be distributed across branches, reducing the current load on each individual branch while maintaining overall high sensitivity through the combination of both branches.
Solution Approach 2:
The two branches are configured with opposite current flow directions, creating a counterbalancing effect where the heating and interference from one branch is compensated by the other branch. This anti-weight approach allows the sensor to achieve high magnetic sensitivity while canceling out thermal effects and interference.
2Measurement precision
If multiple Hall elements are connected in series to increase magnetic sensitivity, then the magnetic sensitivity increases, but the interference from offset voltages increases
Solution Approach 1:
The Hall sensor is divided into two separate branches with opposite current flow directions. This segmentation enables differential measurement where offset voltages from individual Hall elements can be canceled out by the opposing configuration, while the magnetic sensitivity signals add constructively.
Solution Approach 2:
The opposite current flow directions in the two branches create a counterbalancing effect that cancels offset voltage interference. The Hall elements in one branch compensate for offset voltages in the other branch, allowing high magnetic sensitivity to be achieved without proportional increase in offset interference.
3Measurement precision
If a complex arrangement of Hall elements is used to reduce offset voltages, then the offset suppression improves, but the device complexity increases
Solution Approach 1:
The Hall sensor is segmented into two symmetric branches with simple series connections. This segmentation achieves offset voltage suppression through the symmetric opposite configuration without requiring complex interconnections or additional components, maintaining structural simplicity while improving measurement precision.
Solution Approach 2:
The two branches are configured with opposite current flow directions and symmetric arrangements of Hall elements. This controlled asymmetry in current direction combined with spatial symmetry achieves offset cancellation while maintaining a relatively simple overall structure that is easier to manufacture than more complex differential configurations.
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 design increases magnetic sensitivity without increasing current flow, reduces interference from offset voltages and heating, and provides a reliable and efficient measurement of magnetic fields.
Implementation Method 1
The present invention relates to a Hall sensor... Hall sensors are used in many technical areas, e.g., to detect the position of switches or actuators contactlessly... the use and spatial detection of magnetic fields offer advantages
Data Source
AI summary
A Hall sensor including multiple Hall elements which have a first terminal contact and a second terminal contact and a third terminal contact, the multiple Hall elements being electrically connected in series. The first terminal contacts and the third terminal contacts of the individual Hall elements are connected to each other, and the second terminal contacts of the Hall elements are supply voltage terminals or as Hall voltage taps. A beginning of a first branch being electrically connected in series to an end of a second branch, in such a way that the direction of the current flow through the Hall elements of the first branch is counter to the direction of the current flow through the Hall elements of the second branch.