Drive-Sense Circuit Transient Suppression on a Shared Signal Line
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Solution Overview
Problem
Existing sensor and actuator systems face challenges in efficiently converting physical conditions into electrical signals and vice versa, particularly in terms of power requirements, signal interpretation, and interference, which affects their performance and efficiency in data communication systems.
Innovation Solution
The implementation of drive-sense circuits that integrate power and signal management, using a single line for both sensing and actuating functions, reducing interference and optimizing power consumption while enabling concurrent sensing and actuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate lines are used for sensing and actuating functions, then signal integrity is improved, but device complexity and wiring requirements increase
Solution Approach 1:
The patent combines sensing and actuating functions into a single bidirectional communication line. The transceiver circuit alternates between transmitting drive signals to the sensor and receiving sense signals from the sensor over the same physical connection, eliminating the need for separate wiring while maintaining functional integrity through time-division multiplexing.
Solution Approach 2:
The single communication line serves multiple functions: it acts as both a drive line for delivering power and control signals to the sensor and a sense line for receiving measurement data from the sensor. The transceiver circuit is designed to handle both transmission and reception modes on the same physical medium.
2Power
If power supply voltage is increased to improve sensor actuation, then actuation strength is improved, but power consumption and risk of transient damage increase
Solution Approach 1:
The transceiver circuit operates in periodic cycles, alternating between a drive mode where power is delivered to the sensor and a sense mode where measurements are read. This time-division approach allows the sensor to be fully actuated during drive periods while minimizing average power consumption through idle periods.
Solution Approach 2:
The circuit includes transient suppression circuitry that is pre-configured to protect the sensor from voltage spikes and transients. This protective mechanism is in place before any high-voltage actuation occurs, preventing damage while allowing full-power drive signals to be applied when needed.
3Productivity
If concurrent sensing and actuation is enabled, then productivity is improved, but signal interference increases
Solution Approach 1:
The system uses time-division multiplexing to alternate between sensing and actuation operations in discrete time slots. During each cycle, the transceiver first completes a sense operation by receiving signals from the sensor, then performs a drive operation by transmitting signals to the sensor. This periodic separation eliminates simultaneous interference while maintaining high overall productivity through rapid cycling.
Data Source
AI summary
A method includes providing, by a signal source circuit of a sensing circuit, a signal to a sensor via a conductor. When the sensor is exposed to a condition and is receiving the signal, an electrical characteristic of the sensor affects the signal. The signal includes at least one of: a direct current (DC) component and an oscillating component. When the sensing circuit is in a noisy environment, transient noise couples with the signal to produce a noisy signal. The method further includes comparing, by a transient circuit of the sensing circuit, the noisy signal with a representation of the noisy signal. When the noisy signal compares unfavorably with the representation of the noisy signal, supplying, by the transient circuit, a compensation signal to the conductor. A level of the compensation signal corresponds to a level at which the noisy signal compares unfavorably with the representation of the noisy signal.