FM Voltage Absence Detection With Isolation and Redundant Verification
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Solution Overview
Problem
Existing voltage detection methods for electrical equipment pose hazards to workers due to exposure to energized circuits during testing, and there is a need for a reliable, permanently installed device to verify the absence of voltage safely and accurately.
Innovation Solution
A voltage indicator utilizing frequency modulation (FM) techniques with an isolation circuit, redundant paths, and diagnostic systems to ensure accurate detection of voltage absence, incorporating an FM modulator, reference oscillator, mixer, and envelope detector to convert frequency signals to voltage levels, with fail-safe mechanisms to prevent false indications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a portable voltmeter or multimeter is used to test for voltage absence, then the electrician can verify the equipment is de-energized, but the worker is exposed to energized circuits and conductors during the live portions of the test
Solution Approach 1:
The patent introduces a permanently installed voltage detector as an intermediary device between the worker and the energized circuit. This detector continuously monitors voltage presence and provides remote indication, eliminating the need for workers to directly contact or approach energized components during testing. The intermediary device performs the hazardous measurement function while keeping the worker at a safe distance.
Solution Approach 2:
The system performs preliminary voltage detection and verification before worker access is granted. The permanently installed detector continuously monitors and records voltage status, allowing workers to verify safe conditions through indicators or remote displays before approaching equipment, thus preventing exposure to unexpected energization.
2Measurement precision
If traditional voltage testing procedures are used, then voltage absence can be detected, but false readings may occur and the tester must be repeatedly tested on known energized sources
Solution Approach 1:
The patent incorporates feedback mechanisms where the voltage detector continuously monitors circuit status and provides real-time indication to workers. The system includes self-diagnostic capabilities that monitor the detector's own functionality, providing feedback on its operational status without requiring external verification tests.
Solution Approach 2:
The permanently installed voltage detector performs self-verification through built-in diagnostic circuits that continuously monitor its own components. The system automatically detects faults, drift, or malfunction in its sensing elements and provides appropriate warnings, eliminating the need for manual testing on known energized sources.
3Object-affected harmful factors
If a permanently installed voltage detector is used, then worker exposure to energized circuits is reduced, but the device complexity and cost of installation increase
Solution Approach 1:
The patent designs the permanently installed voltage detector to perform multiple functions: continuous voltage monitoring, worker indication, self-diagnostic testing, and fault detection. By consolidating these functions into a single integrated device, the system reduces overall complexity compared to using separate portable testers and diagnostic equipment.
Solution Approach 2:
The system merges the voltage sensing function, indication system, and self-diagnostic capabilities into a single integrated detector unit. This consolidation eliminates the need for multiple separate devices and reduces installation complexity while maintaining comprehensive safety monitoring functionality.
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
Provides a safe and reliable method to verify voltage absence, reducing worker exposure to energized circuits by ensuring accurate detection and preventing false readings through redundant channels and diagnostic validation.
Implementation Method 1
the frequency of an oscillating signal varies in response to a voltage present at an input of the oscillating signal
Implementation Method 2
a mixer attached to the reference oscillator and the FM modulator, wherein the output of the mixer is the difference of the two signals
Data Source
AI summary
An absence of voltage indicator has an isolation circuit, an FM modulator attached to the isolation circuit, a reference oscillator, and a mixer attached to the reference oscillator and the FM modulator, wherein the output of the mixer is the difference of the two signals. In one embodiment, the FM modulator includes a variable capacitor which varies in response to a voltage in parallel to a fixed capacitor and an inductor in parallel to the capacitors.