Single-Line Drive-Sense Circuits for High-Impedance Sensor Linearity
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Solution Overview
Problem
Current data communication systems face challenges in efficiently processing and interpreting signals from a variety of sensors across different applications, including industrial, healthcare, and transportation sectors, due to the complexity of sensor types and their diverse characteristics.
Innovation Solution
The implementation of a communication system that utilizes drive-sense circuits to simultaneously drive and sense signals via a single line, enabling effective communication between sensors and computing devices, and includes a power signal change detection circuit to interpret changes in sensor electrical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional separate drive and sense lines are used for sensors, then signal transmission is straightforward, but power consumption increases and line interference occurs
Solution Approach 1:
The patent combines separate drive and sense lines into a single bidirectional communication line, allowing both driving and sensing functions to occur over the same physical connection. This merging eliminates the need for additional wiring while reducing power consumption and interference through shared signal paths and coordinated timing of drive and sense operations.
Solution Approach 2:
The system employs periodic time-multiplexed operation where the single line alternates between drive mode and sense mode in coordinated time slots. During drive periods, voltage signals are applied to the sensor; during sense periods, the line transitions to sensing mode to read sensor responses. This periodic switching enables full functionality while minimizing interference and power consumption.
2Measurement precision
If high impedance sensors are connected to traditional sensor circuits, then sensor sensitivity is maintained, but signal interpretation becomes complex and error-prone
Solution Approach 1:
The bidirectional communication line implements feedback mechanisms where the sensor's electrical characteristic changes are detected and communicated back to the control system through the same line used for driving. The system monitors sensor responses during sense periods and uses this feedback to accurately interpret high impedance states, compensating for loading effects and improving measurement precision while simplifying operation.
Solution Approach 2:
The communication line acts as an intermediary that mediates between the high impedance sensor and the low impedance digital system. By implementing impedance matching circuits and buffered interfaces at both ends of the line, the system translates high impedance sensor signals into reliable digital communication signals without losing measurement precision or complicating operation.
3Device complexity
If multiple sensors are connected in parallel to a single communication line, then system complexity is reduced, but signal interference and detection difficulty increase
Solution Approach 1:
The system segments the communication process into dedicated time slots for each sensor or groups of sensors. Instead of attempting to read all sensors simultaneously which would cause signal conflicts, the controller sequentially addresses different sensors during different time periods. This time-division multiplexing approach maintains simple parallel physical connections while eliminating signal interference and making detection straightforward through temporal separation.
Solution Approach 2:
The communication line dynamically switches its operational characteristics based on which sensor is being addressed. Impedance matching, signal levels, and sensing thresholds are dynamically adjusted during the sense period to match the specific sensor being read. This dynamic adaptation enables multiple sensors to share the same line without interference while maintaining easy system configuration.
Data Source
AI summary
An automated system includes transducers, at least one computing device, and at least one automated apparatus. The transducer(s) is/are driven and sensed using drive-sense circuit(s). A drives and senses drive and sense a transducer via a single line, generates a digital signal representative of a sensed analog feature to which the transducer is exposed, and transmits the digital signal to the computing device. The computing device receives digital signals from at least some of drive-sense circuits and process them in accordance with the automation process to produce an automated process command. The automated apparatus executes a portion of an automated process based on the automated process command.