AC Harmonic Bypass Circuit Fault Detection for Blown Fuse States
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Solution Overview
Problem
In electronic systems powered by AC mains or derivatives, such as video-recording doorbell systems, limited communication between circuits can lead to undetected circuit failures, causing power issues like brownouts and resulting in poor user experience due to the inability of other circuits or controllers to recognize faults in remote or bypass circuits.
Innovation Solution
Implementing an AC power harmonic-based circuit state detection system that includes a passive component, a bypass circuit, and a controller with an AC power harmonic-based circuit state detector. This system converts AC voltage to DC, filters the voltage to obtain harmonic voltages, and compares them to thresholds to determine the state of the bypass circuit, alerting users or service providers of faults and enabling corrective actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If AC power is provided to multiple separate circuits simultaneously, then power distribution efficiency is improved, but circuit state monitoring capability deteriorates
Solution Approach 1:
The patent introduces an intermediary monitoring mechanism that detects circuit states through harmonic analysis of AC power signals. The controller analyzes harmonic voltages generated by passive components (inductor, capacitor, resistor) in the bypass circuit to determine circuit health status, enabling indirect monitoring without direct communication links between circuits.
2Reliability
If bypass circuit is implemented for passive component, then system reliability is improved, but fault detection capability deteriorates
Solution Approach 1:
The patent uses harmonic voltage analysis as an indirect indicator of circuit state, similar to using color changes as indicators. By detecting changes in harmonic voltage levels and patterns, the system can identify fault conditions (such as blown fuses or failed components) in the bypass circuit without direct observation, translating internal circuit states into detectable electrical signal variations.
3Device complexity
If remote circuit operation is enabled without inter-circuit communication, then device complexity is reduced, but fault awareness deteriorates
Solution Approach 1:
The patent implements a self-service monitoring system where the controller autonomously detects circuit faults by analyzing harmonic voltages from the AC power signal. The system serves itself by using the existing power infrastructure and passive component characteristics to monitor its own health status, eliminating the need for additional communication infrastructure between circuits while maintaining fault awareness.
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 solution allows for early detection and notification of bypass circuit faults, preventing poor user experiences by ensuring timely reset or replacement of faulty components, thus maintaining system functionality and user satisfaction.
Implementation Method 1
The AC power harmonic-based detector is configured to convert an AC voltage of the AC power received at the first terminal and second terminal of the controller to a DC voltage
Implementation Method 2
filter the DC voltage to obtain a voltage of a harmonic of the AC power received at the first terminal and the second terminal of the controller
Data Source
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AI summary
This document describes systems for and techniques of alternating-current (AC) power harmonic-based circuit state detection. In various aspects, a system includes a component, a bypass circuit for the component, and a controller with an AC power harmonic-based circuit state detector that can determine a state of the bypass circuit. The AC power harmonic-based circuit state detector may convert an AC voltage of the AC power to a direct current (DC) voltage, filter the DC voltage to obtain a voltage of a harmonic of the AC power, and compare the voltage of the harmonic to a threshold to determine that the bypass circuit is in a fault state (blown fuse). By so doing, the controller of the system can notify a user that the bypass circuit needs to be reset or replaced to reenable operation of the system and avoid poor user experience typically associated with a non- or mis-functioning system.