Symmetrical Shunt Sampling Layout for Accurate Current Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Poor contact at the connection ends of shunts in circuit loops leads to uneven current density distribution, causing deviations in voltage sampling and reducing detection accuracy.
Innovation Solution
A shunt design with symmetrically distributed sampling points on connection segments, each connected through impedance members with controlled resistance differences, ensuring accurate current detection by minimizing uneven current distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If welding is used to connect the shunt to the circuit loop, then the connection is secure, but bubbles generated during welding cause poor contact at the connection ends, leading to uneven current density distribution and detection accuracy deviation
Solution Approach 1:
The connection segment is divided into multiple sampling points (at least 2 sampling points) along its length. Each sampling point is connected to a corresponding sampling point on the other connection segment through impedance members, creating multiple parallel current paths. This segmentation ensures that even if welding bubbles cause poor contact at certain locations, current can still flow through other sampling points, maintaining uniform current density distribution and detection accuracy.
Solution Approach 2:
Impedance members are introduced as intermediary elements between the sampling points on the first connection segment and the sampling points on the second connection segment. These impedance members control the current distribution by providing known, controlled impedance values that compensate for welding-induced contact variations, ensuring uniform current density across all sampling points.
2Measurement precision
If multiple sampling points are provided on connection segments, then current density distribution is improved, but the device complexity increases due to multiple impedance members and connection ends
Solution Approach 1:
Multiple impedance members are connected in parallel between corresponding sampling points on the first and second connection segments. This merging of parallel paths allows multiple sampling points to function simultaneously without requiring separate, independent measurement circuits for each point, thereby reducing overall device complexity while maintaining high detection accuracy through uniform current density distribution.
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 effectively reduces errors in current detection by maintaining consistent voltage readings across sampling points, improving accuracy and adaptability to various installation conditions.
Implementation Method 1
each of the N sampling points is led out through an impedance member... a resistance difference between any two impedance members is less than or equal to a preset first resistance difference
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
The present application discloses a shunt, an electric device and an energy storage device thereof. The shunt includes a current sampling member. The current sampling member is provided with a first connection segment and a second connection segment. N sampling points are provided on each of the first connection segment and the second connection segment. The N sampling points on the first connection segment and the N sampling points on the second connection segment are symmetrically provided along the midline of the current sampling member; and each of sampling points is led out through an impedance member. The present application aims to improve the detection accuracy of the shunt.