Shunt Resistor Electrode Shorting Side Terminals
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Solution Overview
Problem
Existing current sensing resistor designs, such as those disclosed in Patent Literature 1, fail to provide a method for fixing terminals to the housing when two terminals are located on the side of a package, limiting their effectiveness in shorting and sensing current flows in electronic circuit components with multiple terminals.
Innovation Solution
A current measuring apparatus featuring a resistive element with first and second electrodes, where at least one electrode includes multiple through-holes or an elongated through-hole, allowing for the shorting of two terminals and enabling current measurement, with the electrodes being fixed to the resistive element and the package using screws through these holes, thereby forming a parallel or series circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a shunt resistor with one longer terminal fixed via a single fixation hole is used, then contact resistance is reduced, but the ability to fix terminals located on the side of the package is not addressed
Solution Approach 1:
The shunt resistor is divided into multiple terminals (first terminal, second terminal, third terminal) with different fixation capabilities. The first terminal includes a first fixation hole for single-hole fixation, while the second and third terminals are positioned to enable side fixation, allowing the shunt resistor to adapt to different package terminal configurations
Solution Approach 2:
The shunt resistor is designed with multi-functional terminals that can serve different purposes: the first terminal provides low contact resistance through single-hole fixation, while the second and third terminals provide fixation capability for side-located package terminals. This multi-functionality allows a single shunt resistor design to handle various package configurations
2Measurement precision
If separate shorting bars and shunt resistors are used, then current sensing is achieved, but device complexity increases
Solution Approach 1:
The shunt resistor integrates multiple functions into a single component: it provides current sensing through its resistive element, acts as a shorting bar through the conductive connection between terminals, and provides fixation mechanisms through multiple terminals with fixation holes. This merging eliminates the need for separate shorting bars and reduces overall device complexity
Solution Approach 2:
The shunt resistor performs multiple functions simultaneously: current measurement, terminal shorting, and mechanical fixation. The conductive path through the resistive element provides both sensing capability and shorting function, while the terminal structure provides both electrical connection and mechanical fixation, reducing the total component count
Data Source
AI summary
Provided is a current measuring apparatus including a current measuring resistor that includes a resistive element and first and second electrodes fixed to the resistive element, the current measuring resistor being adapted to measure a current, and an electronic circuit component including a plurality of terminals. One of the first electrode or the second electrode is used to short at least two of the terminals of the electronic circuit component.