Segmented Signal Conditioning Circuit for Wide-Range Voltage Sampling
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Solution Overview
Problem
Existing signal conditioning circuits face challenges in accurately sampling and conditioning voltage signals due to large input voltage ranges, leading to insufficient sampling accuracy or inability to sample when voltages are small, and complexity and cost issues with microcontroller-controlled segmented sampling.
Innovation Solution
A segmented selectable signal conditioning circuit with a voltage threshold circuit, selection circuit, and dual segmented voltage conditioning sub-circuits that automatically segment and condition voltage signals based on threshold values, allowing for continuous conditioning across a broad range with adjustable gains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed amplification multiple is applied to amplify the input voltage, then the sampling accuracy for small voltages is improved, but the circuit cannot condition voltages continuously across different ranges and the complexity increases when using microcontroller-controlled segmented sampling
Solution Approach 1:
The voltage conditioning circuit is divided into multiple segmented sub-circuits, each handling a specific voltage range. The selection circuit automatically routes the input signal to the appropriate segment based on voltage level, enabling continuous conditioning across different ranges without requiring complex microcontroller control.
Solution Approach 2:
The circuit dynamically switches between different conditioning segments based on the input voltage level. The selection circuit automatically adjusts which segment is active, providing adaptive voltage conditioning that responds to changing input conditions without manual intervention or complex control logic.
2Adaptability or versatility
If the input voltage range is made large to cover various scenarios, then the universality of the circuit is improved, but the sampling accuracy deteriorates when the input voltage is small
Solution Approach 1:
The voltage conditioning circuit is divided into multiple segmented sub-circuits, each handling a specific voltage range. The selection circuit automatically routes the input signal to the appropriate segment based on voltage level, enabling continuous conditioning across different ranges without requiring complex microcontroller control.
Solution Approach 2:
Each segmented voltage conditioning sub-circuit is optimized for its specific voltage range with appropriate amplification and conditioning parameters. This local optimization ensures high accuracy for small voltages in one segment while maintaining capability for large voltages in other segments, with each segment having tailored characteristics for its operating range.
Data Source
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AI summary
A signal conditioning circuit and a measurement device are provided. A selection circuit (300) of the signal conditioning circuit outputs a first conduction signal when a voltage value of an input voltage signal is less than a threshold value of a voltage threshold signal, such that a first segmented voltage conditioning sub-circuit (210) conditions, based on the received first conduction signal, the input voltage signal and outputs a first output voltage signal. The selection circuit outputs a second conduction signal when the voltage value of the input voltage signal is greater than the threshold value of the voltage threshold signal, such that the second segmented voltage conditioning sub-circuit (220) conditions the input voltage signal and outputs a second output voltage signal.