Wi-Fi Access Point Low Power Mode for Fire Detection
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Solution Overview
Problem
Existing wireless fire detection systems face reliability issues due to the high cost and size of backup battery support for switches and access points, which are critical for maintaining connectivity during power failures.
Innovation Solution
Implementing a wireless access point that enters a low power mode during power failures, waking up only at scheduled transmission times to reduce power consumption and extend battery life, while ignoring non-essential messages and communicating critical fire system messages via a hardwired Ethernet connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large rechargeable batteries are used to provide backup power for switches and access points during power failures, then the reliability of wireless fire detection systems is improved, but the cost and size of the system increase considerably
Solution Approach 1:
The access point enters periodic low-power sleep modes during power failures, waking only at scheduled transmission times to communicate with fire system appliances. This periodic operation dramatically reduces power consumption compared to continuous operation, allowing smaller, less expensive batteries to maintain system reliability throughout the required backup period.
Solution Approach 2:
The access point dynamically changes its operational parameters by switching between full-power and low-power states based on the power availability and communication schedules. During power failures, it operates in low-power mode with reduced functionality, only activating full power for essential scheduled transmissions, thereby reducing the energy storage requirements.
2Reliability
If access points operate continuously to handle all wireless communications, then communication reliability is improved, but power consumption increases during power failures
Solution Approach 1:
The access point implements periodic operation by entering low-power sleep modes between scheduled transmission times. It wakes up only when fire system appliances need to communicate, maintaining communication reliability for essential operations while dramatically reducing average power consumption during power failures.
Solution Approach 2:
The access point extracts and prioritizes only the essential communication functions needed for fire detection systems during power failures. It selectively ignores non-essential wireless traffic and focuses resources only on scheduled transmissions from fire system appliances, reducing power consumption while maintaining critical communication reliability.
Data Source
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AI summary
Systems and methods of backup battery support for switches and access points in fire detection systems are provided. Methods can include identifying a transmission time interval for a plurality of devices, detecting a power failure, identifying a start time for a next scheduled transmission time interval for a respective one of the plurality of devices, placing a wireless access point in a low power mode, and, substantially immediately prior to the start time for the next scheduled transmission time interval, removing the wireless access point from the low power mode.