Dual-Sensor Signal Collecting Circuit With Shared AD Port
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Solution Overview
Problem
Existing dual-sensor signal collecting circuits require multiple AD sampling ports to ensure stability, leading to inefficient resource utilization and potential signal loss if one sensor fails.
Innovation Solution
A dual-sensor signal collecting circuit with an AND gate judging circuit and a collected signal averaging circuit, where both sensor signals are connected to a shared AD sampling port, allowing the circuit to automatically switch to the functioning sensor's signal when one fails, thereby maintaining stability and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two sensors are used in parallel to simultaneously collect signals, then the reliability of signal collection is improved, but the number of AD sampling ports required increases
Solution Approach 1:
The patent merges two separate signal collection paths into a single shared AD sampling port by introducing an analog multiplexer. The multiplexer selectively connects either the first sensor or the second sensor to the shared AD sampling port based on which sensor is functioning, thereby reducing the number of AD sampling ports from two to one while maintaining reliable signal collection capability.
Solution Approach 2:
The shared AD sampling port is designed to serve multiple functions: it can collect signals from either the first sensor or the second sensor interchangeably. The analog multiplexer enables this multi-functionality by dynamically routing the appropriate sensor signal to the single AD sampling port, making the AD resource universally applicable to both sensors.
2Productivity
If a single AD sampling port is shared between two sensors, then the resource utilization is improved, but the circuit complexity increases
Solution Approach 1:
The patent introduces an analog multiplexer as an intermediary device between the two sensors and the shared AD sampling port. This intermediary component manages the complexity of switching between sensors, providing a clean interface to the AD converter while handling the routing logic. The multiplexer acts as a mediator that simplifies the overall system architecture despite the added switching functionality.
Solution Approach 2:
The circuit incorporates automatic fault detection and switching capability where the system monitors the health of each sensor and automatically switches to the functioning sensor without requiring external intervention. The control logic within the multiplexer automatically responds to sensor failure conditions, enabling the system to self-manage the complexity of having a shared resource.
3Reliability
If one sensor fails in a dual-sensor configuration with separate AD ports, then the signal collection reliability is improved, but the AD resource consumption increases
Solution Approach 1:
The patent implements a dynamic switching mechanism where the connection between sensors and the AD sampling port is not fixed but can change based on sensor operational status. The analog multiplexer dynamically reconfigures the signal path, connecting the functioning sensor to the AD port while disconnecting the failed sensor, thereby adapting the system configuration in real-time to maintain reliability with minimal AD resources.
Data Source
AI summary
A dual-sensor signal collecting circuit comprises circuit (11), a second sensor signal collecting circuits, an AD sampling circuit, an AND gate determination circuit and a collected signal averaging circuit. Output ends of the sensor signal collecting circuits are connected to respective input ends of the AND gate determination circuit, respective input ends of the collected signal averaging circuit and a first AD sampling port of the AD sampling circuit; an output end of the AND gate determination circuit is connected to a power supply end of the collected signal averaging circuit; an output end of the collected signal averaging circuit is connected to the first AD sampling port of the AD sampling circuit. When the sensors operate normally, the collected signal averaging circuit outputs an average sampling value to the first AD sampling port, when one is damaged, a sampling value of the one operating normally is output to the first AD sampling port.