Sink-Sense Load Sensing Circuit for Single-Line Signal Integrity
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Solution Overview
Problem
Current data communication systems face challenges in efficiently processing and interpreting signals from sensors and actuators due to the need for separate drive and sense lines, which increases power consumption and interference, especially when dealing with high impedance sensors and actuators.
Innovation Solution
The implementation of drive-sense and sink-sense circuits that utilize a single line for both drive and sense functions, allowing for concurrent sensing and actuation while reducing power requirements and line-to-line interference, by using a common sense-node and multiple separate drive or sink signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate drive and sense lines are used for sensors and actuators, then signal integrity and control precision are improved, but power consumption increases and line-to-line interference occurs
Solution Approach 1:
The patent combines separate drive and sense lines into a single shared line for communicating with sensors and actuators. The controller alternates between driving the shared line and sensing signals on the same line, eliminating the need for separate dedicated lines while maintaining communication functionality. This merging reduces the total number of lines and associated power consumption.
Solution Approach 2:
The controller employs periodic time-division multiplexing on the shared line, alternating between drive modes (sourcing or sinking current) and sense modes (measuring impedance or voltage). This periodic switching allows the same physical line to serve multiple functions at different time intervals, reducing power consumption while maintaining signal integrity through careful timing and isolation.
2Measurement precision
If separate drive and sense lines are used for sensors and actuators, then control accuracy is improved, but device complexity and interference increase
Solution Approach 1:
The patent merges multiple separate lines (drive line and sense line) into a single shared communication line. The controller manages this shared line by alternating between drive and sense operations, reducing the physical complexity of the wiring harness and connector requirements while maintaining control accuracy through software-managed time-division multiplexing.
Solution Approach 2:
The shared line serves multiple functions: it acts as a drive line during actuation phases and as a sense line during measurement phases. This multi-functionality is achieved through the controller's ability to switch between sourcing and sinking current modes, allowing a single physical line to replace what would traditionally require separate dedicated lines for each function.
3Use of energy by moving object
If a single shared line is used for both drive and sense functions, then power consumption and interference are reduced, but signal differentiation and sensing accuracy become challenging
Solution Approach 1:
The controller uses periodic time-division multiplexing to alternate between drive and sense modes on the shared line. During sense intervals, the controller stops driving and measures the line's impedance or voltage, ensuring that sensing occurs when no drive current is present. This temporal separation maintains sensing accuracy while allowing power-efficient sharing of the line.
Solution Approach 2:
The controller employs feedback mechanisms to monitor the shared line's electrical characteristics during both drive and sense modes. By measuring impedance changes, voltage levels, or current flow patterns, the controller can differentiate between drive signals and sensor responses, maintaining sensing accuracy even though the same physical line is used for both functions.
Data Source
AI summary
A load sensing circuit includes a load coupled to a load source having a load voltage that causes a load signal to flow through the load. A regulated sink circuit is coupled in series to a sink source and the load, and provides a sink voltage. A comparison circuit a reference signal that establishes a reference value of a second electrical characteristic at a reference input; a sense input is coupled to the load and to the regulated sink circuit. The regulated sink circuit regulates the first electrical characteristic of the load signal, based on a regulation signal, so that a sense value of the second electrical characteristic present at the sense input matches the reference value of the second electrical characteristic. A comparison signal is generated at an output of the comparison circuit, and indicates a difference between the sense value of the second electrical characteristic and the reference value of the second electrical characteristic. A feedback circuit coupled to the comparison output and to the regulated sink circuit, generates the regulation signal based on the comparison signal.