Bridge Strain Gauge Circuit With Shared Read Lines
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Solution Overview
Problem
Existing detection devices with sensor arrays have a large number of wires, which complicates the circuit configuration and increases complexity.
Innovation Solution
A detection device with a bridge circuit configuration that includes a capacitance element between nodes and switch elements connected to a common reference power supply line and detection circuit, reducing the number of wires by using a single read line and common power supply for each cell row.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor array with multiple bridge circuits is used for strain detection, then measurement precision is improved, but device complexity increases due to the large number of wires required
Solution Approach 1:
Multiple bridge circuits share common reference power supply lines and common read lines, merging previously separate wiring resources. This reduces the total wire count while maintaining the ability to independently measure multiple strain gauges arranged in a matrix pattern.
Solution Approach 2:
The reference power supply lines and read lines serve multiple functions by being shared across multiple bridge circuits. A single read line can sequentially read multiple strain gauge values, and reference power supply lines provide power to multiple bridge circuits, making the wiring structure universal rather than dedicated to each sensor.
2Reliability
If each bridge circuit has dedicated wires for power supply and reading, then reliability is improved, but ease of manufacture deteriorates due to increased wiring complexity
Solution Approach 1:
The patent combines multiple dedicated wire connections into shared common lines. Multiple bridge circuits connect to the same reference power supply lines and read lines, reducing the total number of wire connections needed during manufacturing while maintaining stable electrical connections through proper circuit design.
3Device complexity
If the number of wires in the sensor array is reduced, then device complexity is reduced, but measurement precision may deteriorate due to shared signal paths
Solution Approach 1:
The patent employs sequential switching to alternately connect different strain gauges to the common read line. By periodically switching between different sensors in time-division multiplexing, the system maintains measurement precision despite sharing physical wiring resources, as each sensor is measured independently in its designated time slot.
Solution Approach 2:
Switching elements act as intermediaries between the common read line and individual strain gauges. These switches isolate each strain gauge from the shared line during measurement, preventing signal interference while enabling multiple sensors to share the same physical wiring infrastructure.
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
This configuration allows for efficient strain detection with a reduced number of wires, simplifying the circuit and reducing complexity while maintaining accurate measurement capabilities.
Implementation Method 1
a capacitance element provided between the first node and the third node
Data Source
AI summary
A detection device includes a bridge circuit including a first node to which a second end of a first resistance element and a first end of a second resistance element are connected, a second node to which a second end of the second resistance element and a first end of a third resistance element are connected, a third node to which a second end of the third resistance element and a first end of a strain gauge resistance element are connected, and a fourth node to which a second end of the strain gauge resistance element and a first end of the first resistance element are connected, a capacitance element between the first node and the third node, a first switch element between the fourth node and a reference power supply line, and a second switch element between the second node and a detection circuit.