Passive Infrared Sensor Power Reduction via Signal Halting
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Solution Overview
Problem
Passive infrared ray sensors with multiple pyroelectric elements face challenges in reducing power consumption while maintaining accurate intruder detection, as noise from external environments can lead to unstable detection signals and increased power usage, and adjusting the activation threshold affects both power consumption and detection accuracy.
Innovation Solution
A passive infrared ray sensor design that includes multiple detecting elements and a detection processing unit with individual signal processing subunits, where signal processing is halted for unstable signals caused by noise, and only resumed when stable signals indicate an intruder, using a mode setting circuit and trigger circuit to manage operating and halt modes, reducing power consumption while ensuring accurate detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the activation threshold value is lowered to detect intruders in noisy environments, then detection sensitivity is improved, but power consumption increases due to frequent signal processing activation
Solution Approach 1:
The patent divides the detection system into multiple independent pyroelectric elements, each with its own signal processing capabilities. By segmenting the detection areas and processing units, the system can independently evaluate signals from different elements and only activate full processing when necessary, reducing overall power consumption while maintaining detection sensitivity.
Solution Approach 2:
The patent implements dynamic threshold adjustment and adaptive signal processing activation. The microcomputer dynamically determines whether to activate full signal processing based on real-time evaluation of detection signals against threshold values, allowing the system to adapt its power consumption level to environmental conditions while maintaining detection capability.
2Use of energy by moving object
If the activation threshold value is increased to reduce power consumption, then power consumption is reduced, but detection accuracy decreases due to missed intruder signals
Solution Approach 1:
The patent combines signals from multiple pyroelectric elements and merges their evaluation results. By merging the detection capabilities of multiple elements with different threshold evaluations, the system achieves both power savings (through selective processing activation) and maintained detection accuracy (through combined signal evaluation).
Solution Approach 2:
The patent implements feedback mechanisms where the microcomputer continuously monitors detection signals and adjusts processing activation based on signal characteristics. The system uses feedback from threshold comparisons to dynamically control whether full signal processing is activated, optimizing the balance between power consumption and detection accuracy.
3Reliability
If signal processing is continuously performed for all pyroelectric elements, then detection reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies partial action by performing full signal processing only when necessary rather than continuously. The microcomputer evaluates signals against threshold values and activates comprehensive processing only when detection signals indicate potential intruders, performing partial evaluation during normal conditions to maintain reliability while reducing power consumption.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively minimizes power consumption by halting signal processing for noisy signals and only processing stable signals, ensuring reliable intruder detection even in noisy environments, thereby extending battery life and preventing false alarms or missed detections.
Implementation Method 1
infrared rays of light emanating from an intruder then entering in a detection region is collected by an optical element and then received by a detection element such as, for example, a pyroelectric element
Data Source
AI summary
A passive infrared ray sensor of the present invention includes a plurality of detecting elements 2 and 3 for detecting infrared rays of light emanating from an intruder H present in different detection areas A1 and A2 of a detection region A, and a detection processing unit 6 including a plurality of individual signal processing subunits 7A, 7B each operable to perform a signal processing subject to a detection signal fed from the respective detection element 2 or 3, whereby when the detection signal from at least one of the detecting elements 2 and 3 indicates a detection of a noise other than the intruder, the signal processing of such detecting element 2 or 3 is halted.