Summing Amplifier Analog Input Redundancy
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Solution Overview
Problem
Conventional processing systems with multiple microprocessors face challenges in accurately determining analog input field values, loop statuses, and diagnostics due to variations in measurements caused by different measurement times, component tolerances, and hardware failures, leading to inconsistent results and potential faults.
Innovation Solution
A method and system utilizing multiple processing devices to measure and combine analog signal measurements, identify valid measurements, and generate a final measurement or overall loop status using combination logic, which can operate regardless of the number of healthy processing devices, employing majority voting and logical operations to determine the health of each device and generate accurate output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple processing devices measure analog signals independently, then measurement redundancy and system reliability are improved, but measurement consistency and accuracy deteriorate due to variations in measurement times and component tolerances
Solution Approach 1:
The patent combines measurements from multiple processing devices by feeding their output signals into a summing amplifier circuit. This merging approach aggregates the individual measurements into a combined signal that represents the collective state of all devices, enabling the system to tolerate individual device failures while maintaining overall measurement accuracy through the combined data from all sources.
Solution Approach 2:
The patent implements feedback mechanisms where the output of each processing device is fed back through resistors to the summing amplifier. This feedback structure allows the system to continuously monitor and adjust the combined measurement based on the state of individual devices, ensuring that faulty devices do not compromise the overall measurement accuracy while maintaining redundancy.
2Reliability
If redundant processing devices are implemented for hot standby, then system availability and fault tolerance are improved, but device complexity and configuration difficulty worsen
Solution Approach 1:
The patent designs the processing devices to perform multiple functions: they can operate independently as individual measurement units or collectively as a redundant system. Each device is configured to measure analog signals and feed their output to the summing amplifier, allowing the same hardware to serve both as a single-point-of-failure system and a high-availability redundant system without requiring different device types or complex configuration.
Solution Approach 2:
By merging all processing device outputs into a single summing amplifier circuit, the patent simplifies the system architecture compared to traditional master-slave redundancy configurations. Instead of requiring complex switching mechanisms or master device coordination, the system simply combines all device signals mathematically, reducing configuration complexity while maintaining fault tolerance.
3Measurement precision
If all processing devices must be healthy for accurate measurement, then measurement accuracy is maintained, but system productivity and response time worsen during failures
Solution Approach 1:
The patent prepares for device failures beforehand by implementing a summing amplifier configuration that can process measurements from any combination of healthy devices. The system is designed to tolerate individual device failures without requiring complete system shutdown or lengthy switch-over periods. When a device fails, the remaining healthy devices continue to provide measurement data that is automatically weighted and combined, maintaining productivity and response time while preserving measurement accuracy through the contribution of all functional sources.
Data Source
AI summary
A method includes receiving multiple measurements of an analog signal, where the measurements are taken using multiple measuring devices. The method also includes identifying whether any of the measurements are valid. In addition, the method includes, if at least one of the measurements is valid, generating a final measurement of the analog signal based on the at least one valid measurement.