Single-Line Drive-Sense Circuits for Adaptive Sensor Interfacing
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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 characteristics and the need for simultaneous driving and sensing capabilities.
Innovation Solution
The implementation of drive-sense circuits that can simultaneously drive and sense signals via a single line, enabling effective communication and processing of sensor data across diverse applications by integrating with computing devices and actuators, and utilizing a power signal change detection circuit to interpret changes in sensor electrical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If separate drive and sense lines are used for sensor communication, then signal driving capability is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent combines the drive and sense functions into a single integrated circuit that operates over a single communication line. The drive-sense circuit alternates between driving the sensor with excitation signals and sensing the sensor response on the same line, eliminating the need for separate drive and sense lines. This merging reduces the number of circuit components, simplifies the overall system architecture, and reduces power consumption while maintaining full sensing capability.
2Measurement precision
If multiple separate circuits are used for different sensor types, then sensing accuracy for each sensor type is improved, but device complexity increases
Solution Approach 1:
The patent implements a universal drive-sense circuit that can interface with multiple types of sensors including capacitive, resistive, inductive, and piezoelectric sensors through a single integrated design. The circuit automatically adapts to different sensor types by detecting sensor characteristics and adjusting drive parameters accordingly. This multi-functional approach maintains high sensing accuracy for each sensor type while significantly reducing system complexity compared to having separate dedicated circuits for each sensor type.
Solution Approach 2:
The drive-sense circuit dynamically adjusts drive signal parameters such as frequency, amplitude, and waveform based on the detected sensor type and characteristics. By changing these parameters in real-time, the circuit optimizes sensing accuracy for different sensor types without requiring separate hardware circuits. The circuit can switch between different drive modes and sensing algorithms to match the specific requirements of each sensor type.
3Device complexity
If simple sensing circuits are used, then device complexity is reduced, but the ability to simultaneously drive and sense signals is compromised
Solution Approach 1:
The drive-sense circuit employs periodic time-division multiplexing where it alternates between drive phases (exciting the sensor) and sense phases (measuring the sensor response) in rapid succession. This periodic operation allows the single circuit to perform both drive and sense functions effectively, maintaining full signal processing capability while using a simplified single-line architecture. The switching between modes is timed to prevent interference between drive and sense operations.
Solution Approach 2:
The circuit implements dynamic switching between drive and sense modes with adaptive parameter adjustment. The circuit can dynamically change its operating characteristics based on real-time conditions, sensor type, and measurement requirements. This dynamic behavior enables the simplified circuit to achieve the full functionality of more complex static circuits by adapting its parameters and operation mode flexibly.
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.