Broadband Gateway AC Power Loss Detection
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Solution Overview
Problem
Communication gateways powered by AC supplies face challenges in sending a 'dying gasp' signal to indicate AC power loss before the DC power supply fails, leading to potential prolonged connection issues and resource wastage.
Innovation Solution
A broadband communication gateway with an AC to DC converter and a processing unit that detects AC power loss, generating a communication message to external devices before the DC voltage drops below operational thresholds, using a comparator to identify changes in the DC output signal indicative of AC power failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the communication gateway waits for DC voltage to drop below threshold before sending communication, then power detection is simple, but the dying gasp signal is sent too late causing prolonged connection issues
Solution Approach 1:
The comparator continuously monitors the DC output signal and detects AC power loss in advance by comparing voltage levels before the DC voltage drops below the operational threshold. This preliminary detection enables the processing unit to generate the dying gasp signal timely, resolving the contradiction between early detection and simple power detection mechanisms
Solution Approach 2:
The comparator acts as an intermediary component between the DC power supply and the processing unit. It translates the DC output signal into a detectable voltage level that indicates AC power loss, enabling reliable early detection without requiring complex monitoring of the AC input signal directly
2Reliability
If the gateway sends communication after AC power loss but before DC voltage drops, then resource reassignment is enabled, but detection precision must be high
Solution Approach 1:
The comparator detects AC power loss by monitoring parameter changes in the DC output signal voltage level. When AC power is lost, the DC voltage transitions from a nominal level to an AC-missing DC voltage level, which the comparator detects by comparing against a reference voltage, enabling accurate detection without complex measurement systems
Solution Approach 2:
The patent replaces complex AC power detection mechanisms with a simpler DC voltage comparison approach. Instead of monitoring AC input signal characteristics, the system uses the existing DC output signal and compares its voltage level using a comparator, reducing detection difficulty while maintaining accuracy
3Loss of time
If the system monitors DC voltage continuously, then timely detection is achieved, but energy consumption increases
Solution Approach 1:
The comparator circuit is designed to operate passively from the existing DC output signal without requiring additional power supply infrastructure. The detection mechanism uses the power already present in the system (the DC output signal itself) to drive the comparison operation, minimizing additional energy consumption while achieving continuous monitoring
Solution Approach 2:
The comparator serves as an energy-efficient intermediary that translates power state information from the DC signal into a detectable form without requiring high-power operation. By using voltage level comparison rather than active sensing, the system achieves timely detection with minimal additional energy 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
Enables timely communication of AC power loss to service providers, allowing for resource reassignment and logging of failures, preventing inactive connections and ensuring efficient power management.
Implementation Method 1
a comparator which generates the said interrupt signal based on comparing the DC output signal received from the converter and a regulated voltage signal and upon detecting a predetermined change in the DC output signal
Data Source
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AI summary
In general, various methods, apparatuses, and systems are described for communicating a loss of an AC power source. In at least certain embodiments, a broadband communication gateway receives a direct current (DC) output signal from an alternating current (AC) to DC converter that detects a loss of an AC input signal. The apparatus further includes a processing unit that generates a communication message in response to receiving an interrupt signal based on the detection of the loss of the AC input signal. The processing unit controls an analog front end that sends the communication message to a device external to the broadband communication gateway in response to the interrupt signal prior to a voltage of the DC output signal decreasing below a threshold voltage needed for operation of the broadband communication gateway.