Sensor Signal Processing Circuit for Power Management
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Solution Overview
Problem
Existing sensor technologies consume excessive power due to the need for continuous operation to detect physical phenomena, with current power management techniques not effectively applied to sensor nodes, leading to inefficiencies in energy usage.
Innovation Solution
Implementing a signal processing circuit that tests sensor signals against criteria before passing them to a microcontroller, allowing only significant signals to consume processing energy, and adjusting these criteria based on power supply status and feedback signals to optimize power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensor operates continuously to detect physical phenomena, then the sensor can reliably detect phenomena, but the power consumption increases
Solution Approach 1:
The signal processing is divided into multiple stages with different processing depths. The system segments the processing chain into a first stage (analog signal conditioning and initial processing) and a second stage (digital signal processing), allowing selective activation based on signal quality to reduce overall power consumption while maintaining detection reliability.
Solution Approach 2:
The system dynamically adjusts processing criteria and power consumption based on signal characteristics and operational conditions. The microcontroller adjusts the threshold for passing signals to the second processing stage based on feedback about signal quality, enabling the system to adapt power usage to actual detection needs rather than operating at constant maximum capacity.
2Productivity
If all sensor signals are processed by the microcontroller, then complete signal processing is achieved, but power consumption increases
Solution Approach 1:
The system extracts and processes only the most significant portions of sensor data through the first processing stage before deciding whether to send signals to the microcontroller. By taking out and handling the initial signal conditioning and filtering in dedicated circuitry, the system reduces the burden on the microcontroller and lowers overall power consumption while maintaining processing completeness for relevant signals.
Solution Approach 2:
The system applies partial processing to all signals through the first stage, then selectively applies full processing only to signals that meet certain criteria. This partial action approach ensures that not all signals require maximum processing resources, thereby reducing total power consumption while maintaining completeness for signals that need full processing.
3Measurement precision
If the signal processing threshold is set low to capture more signals, then signal detection sensitivity improves, but power consumption increases
Solution Approach 1:
The system applies different processing quality levels to different signals based on their characteristics. Signals that meet the threshold criteria receive full processing quality, while signals below the threshold receive minimal or no processing. This local quality differentiation allows the system to maintain high detection sensitivity for relevant signals while avoiding the power consumption associated with processing all signals at full quality.
Data Source
AI summary
A sensor power management arrangement includes a signal processing circuit configured to receive signal from a sensor, to test the signal against at least one criterion, and to pass the signal for further processing in response to the signal passing the at least one criterion. In this way, only signals that are of a sufficient importance or significance will consume the maximum amount of processing energy and through processing by later processes or circuitry. Should a signal from a sensor not be strong enough or meet other criteria, power will not be wasted in preparing that signal for provision to the microcontroller or microprocessor. Additional flexibility in the sensor power management can be realized by adjusting the criteria against which the sensor signal is compared based on a status of the sensor apparatus.