Programmable Drive-Sense Unit for Single-Line Load Sensing
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Solution Overview
Problem
Current data communication systems in sensor applications face challenges in efficiently processing and interpreting signals from various physical conditions, particularly in terms of power management and signal representation, which affects the accuracy and reliability of data collection and communication.
Innovation Solution
The implementation of a drive-sense circuit that uses a power signal change detection circuit and a regulation circuit to detect changes in electrical characteristics of sensors and generate representative signals, enabling efficient data communication and actuation while minimizing power consumption and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional data communication systems are used in sensor applications, then basic signal transmission is achieved, but power consumption is high and noise interference increases
Solution Approach 1:
The patent transforms sensor output signals from voltage domain to current domain, and further to frequency domain through modulation. This parameter transformation allows the use of current-mode logic (CML) circuits that consume less power while maintaining signal integrity. The frequency domain representation also provides noise immunity, resolving the contradiction between low power consumption and high signal accuracy.
Solution Approach 2:
The patent replaces conventional voltage-based digital communication with current-based differential signaling. This substitution enables the use of current mirrors and differential amplifiers that are inherently more noise-resistant and consume less power in the analog domain, before digital conversion. The differential current signaling eliminates the need for high-voltage swings, reducing power consumption while improving signal-to-noise ratio.
2Productivity
If conventional sensing and actuation circuits are used, then basic functions are achieved, but interference between concurrent operations increases
Solution Approach 1:
The patent separates sensing and actuation functions into distinct current domain circuits that operate in parallel. By using separate current mirrors and differential pairs for sensing versus actuation, the system enables concurrent operations without mutual interference. The segmentation of functions into independent current-based modules allows simultaneous operation while maintaining signal integrity through differential signaling that rejects common-mode noise.
3Object-affected harmful factors
If standard data formatting circuits are used, then data communication is achieved, but noise resistance is insufficient
Solution Approach 1:
The patent introduces current domain differential signaling as an intermediary between the sensor and digital processing circuits. This intermediate current-based representation acts as a noise-resistant buffer that translates weak sensor voltages into robust differential currents before digital conversion. The differential current domain serves as an intermediary that inherently rejects common-mode noise while maintaining signal fidelity, reducing the need for additional noise filtering circuits.
Data Source
AI summary
A method for execution by one or more processing modules to configure a programmable drive-sense unit (DSU) includes determining one or more load sensing objectives based on sensing a load using the DSU that is configured to drive and simultaneously to sense the load via a single line. The method further includes determining one or more data processing objectives associated with sensing the load. The method further includes determining desired characteristics for the output data associated with sensing the load. The method further includes determining operational parameters for the DSU based on one or more of the load sensing objectives, the data processing objectives, and the desired characteristics for the output data. The method further includes configuring the DSU based on the operational parameters to achieve the one or more load sensing objectives.