Portable Gas Sensor Power Switching for Faster Air Quality Readings
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Solution Overview
Problem
Portable electronic devices with metal oxide sensors face delays in air quality measurement due to the need for stabilization when transitioning from sleep to active mode, affecting user experience and power efficiency.
Innovation Solution
Implementing an ultra-low power mode for inactive devices and a normal power mode for active devices, with data sampling rates adjusted accordingly, and using a comparison chart of stabilized resistance values to estimate ambient air quality quickly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the metal oxide sensor is heated frequently in normal power mode to improve measurement accuracy, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic power mode switching for the metal oxide sensor based on device activity state. The sensor operates in ultra-low power mode during device sleep and transitions to normal power mode when the device is active. This dynamic adjustment resolves the contradiction by adapting the heating frequency and measurement intensity to actual usage requirements, achieving accurate measurements when needed while minimizing power consumption during inactivity.
Solution Approach 2:
The patent changes operational parameters (heating temperature, measurement frequency, data sampling rate) based on power mode. In ultra-low power mode, the sensor uses lower heating power and reduced sampling rates. When transitioning to normal power mode, parameters are adjusted to enable frequent accurate measurements. This parameter adaptation resolves the contradiction between measurement precision and power consumption.
2Use of energy by moving object
If the metal oxide sensor is not heated frequently in ultra-low power mode to reduce power consumption, then power consumption is reduced, but measurement speed deteriorates
Solution Approach 1:
The patent performs preliminary heating and stabilization of the metal oxide sensor before the device transitions from sleep mode to active mode. By pre-heating the sensor during the transition period, the system ensures that when the device becomes active, the sensor is already ready to provide accurate measurements immediately. This preliminary action resolves the contradiction by preparing the sensor in advance, so that when normal operation begins, both power efficiency and measurement speed requirements are satisfied.
3Productivity
If the metal oxide sensor transitions from ultra-low power mode to normal power mode to improve measurement frequency, then data sampling rate is improved, but stabilization time increases
Solution Approach 1:
The patent initiates the heating and stabilization process of the metal oxide sensor before the device transitions from sleep mode to active mode. This preliminary action ensures that the sensor completes its stabilization during the transition period, so that when normal operation begins, the sensor is already ready to provide accurate measurements immediately. This eliminates the lag and delay in getting accurate air quality measurements that would otherwise occur after mode switching.
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
Enables rapid air quality measurement with improved user experience and reduced power consumption by estimating stabilized resistance values in normal power mode.
Implementation Method 1
it requires lot power to heat the metal oxide sensor to measure the air quality through the resistance measurement
Implementation Method 2
measure the air quality through the resistance measurement
Data Source
Figure 1a
Figure 1b
Figure 2
AI summary
The invention discloses a method and a system (100) of operating a gas sensor 10 in a portable electronic device (50). The gas sensor (10) operates in an ultra-low power mode when the portable electronic device (50) is inactive and the gas sensor (10) operates in a normal power mode when the portable electronic device (50) is active. The method involves storing a baseline resistance value of the gas sensor (10) in the ultra-low power mode. The gas sensor (10) transitions to a normal power mode from the ultra-power mode, when the portable electronic device (50) is active. A rate of stabilization of resistance value of the gas sensor (10) is computed in the normal power mode. A stabilized resistance value of the gas sensor (10) in the normal power mode is estimated based on the rate of stabilization of resistance value of the gas sensor (10) in the normal power mode, the baseline resistance value in the ultra-low power mode and a comparison chart of stabilized resistance values of the gas sensor (10) in the ultra-low power mode and the normal power mode.