Motion Sensor Startup Inhibition Control
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Solution Overview
Problem
Current motion detectors with passive infrared sensors experience prolonged inhibition periods after power cuts, leading to delayed detection and increased time to restore safety devices like lighting and alarms, due to the stabilization time of the amplification chain and sensitivity to environmental factors.
Innovation Solution
A method and device that includes an initialization phase with a controlled inhibition phase for detection signal, determined by the control unit, which is shorter than the maximum charging phase, allowing for faster authorization of detection signals and reducing the inhibition duration after a power cut, utilizing a control and command unit connected to the amplification and filtering stage of the infrared sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the amplification chain uses high-gain amplifiers and band-pass filters with high resistor and capacitor values to mitigate environmental effects, then the detection precision is improved, but the stabilization time increases to about 20 seconds
Solution Approach 1:
The patent applies dynamics by making the inhibition duration adjustable rather than fixed. The control unit dynamically sets the inhibition duration based on the actual charging phase duration, allowing the system to adapt to different power cut scenarios. This dynamic adjustment resolves the contradiction by enabling faster detection authorization when capacitors are already charged, while maintaining sufficient stabilization time when needed.
Solution Approach 2:
The patent changes the parameter of inhibition duration from a fixed value (30-60 seconds) to a variable parameter that depends on the charging phase duration. By making the inhibition duration a function of the actual capacitor charging state, the system can reduce the inhibition time when capacitors are partially charged, thus resolving the time loss issue while maintaining detection precision.
2Reliability
If the detection system waits for complete capacitor charging before authorizing detection, then the reliability is improved, but the duration of action increases significantly
Solution Approach 1:
The patent applies partial action by authorizing detection before complete capacitor charging is achieved. Instead of waiting for full charging (which would take 20-60 seconds), the system authorizes detection when the capacitors are sufficiently charged to provide reliable detection, which occurs earlier in the charging process. This partial action approach reduces the inhibition duration while maintaining adequate reliability.
Solution Approach 2:
The control unit continuously monitors the charging phase duration and uses this feedback to determine when to authorize detection. The system adjusts the inhibition duration based on actual charging progress, creating a feedback loop that optimizes both reliability and response time. This feedback mechanism allows the system to transition from conservative waiting to timely detection authorization.
3Stability of the object's composition
If the inhibition duration is set to 30-60 seconds to ensure complete capacitor charging, then the stability is improved, but the speed of detection after power cut deteriorates
Solution Approach 1:
The patent makes the inhibition duration dynamic rather than static. The control unit adjusts the inhibition duration based on the actual charging phase duration, allowing the system to stabilize quickly when capacitors are already partially charged. This dynamic approach resolves the contradiction by enabling fast detection authorization while maintaining stability through continuous monitoring of charging progress.
Solution Approach 2:
The system performs preliminary action by monitoring capacitor charging during the power cut and preparing for quick detection authorization once charging is sufficient. The control unit proactively manages the charging phase and prepares the detection system in advance, so that when power is restored, detection can be authorized immediately without waiting for complete charging, thus improving speed while maintaining stability.
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
This approach significantly reduces the detection inhibition time after a power cut, enabling faster restoration of safety devices by allowing detection authorization based on predefined voltage thresholds, thus enhancing the speed of detection and reducing downtime.
Implementation Method 1
The pyroelectric sensors used in these detectors generate an electric charge in response to a variation in temperature
Implementation Method 2
a large amplification of this signal is necessary to allow its processing
Implementation Method 3
the stabilization time for the amplification chain, directly linked to the charging time of the capacitors
Data Source
Figure 1
Figure 2~3B
Figure 4
AI summary
The method involves initializing a motion detector, amplifying and filtering a signal at the output of an infrared sensor and carrying out a detection phase after the initialization step. A phase of inhibition of a detection signal is determined during the initialization step. A duration of the detection signal is determined by a lighting device controlling and commanding unit e.g. microcontroller, from an operating voltage and is lower than a maximum duration of a phase of the charging capacitors. An independent claim is also included for a device for implementing a method for detecting start-up for motion detector.