Phantom Voltage Detection Using Coupled Inductor for Blackout Sensing
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Solution Overview
Problem
Existing emergency lighting systems that rely on a live power supply are costly and time-consuming to implement and may not function during power blackouts, as the live power supply can be cut off, disrupting essential services like medical equipment and emergency lighting.
Innovation Solution
A power blackout sensing system that includes a voltage regulator, a sensing block with a coupled inductor device and voltage sense amplifier, and a secondary power source, which detects phantom voltage on phase wires to generate a signal for a secondary power source during blackouts, eliminating the need for a permanent live power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a live power supply is used for emergency lighting system, then the system can operate during normal power conditions, but the system may not work during power blackout conditions and requires costly utility construction
Solution Approach 1:
The system uses the available phantom voltage from the power lines themselves to power the detection circuitry, eliminating the need for external live power supply or complex utility construction. The sensing block detects and utilizes the existing electromagnetic field to generate operating voltage for the voltage sense amplifier and control logic.
Solution Approach 2:
A coupled inductor device is introduced as an intermediary to convert the phantom voltage signal into a usable form for detection. The inductor couples the neutral wire signal to generate a 180-degree phase-shifted voltage signal, which is then amplified and processed to detect blackout conditions.
2Reliability
If a live power supply is used for emergency lighting system, then the system can function during normal conditions, but implementation is time consuming and costly
Solution Approach 1:
The system eliminates the need for separate power supply installation by using the existing power line infrastructure. The phantom voltage detection circuitry is powered directly from the power lines, removing time-consuming utility construction and simplifying installation to just connecting the sensing block to available power wires.
3Measurement precision
If phantom voltage detection is implemented, then the system can detect blackout conditions, but requires complex signal processing with coupled inductor and voltage sense amplifier
Solution Approach 1:
The system uses electromagnetic field coupling through the coupled inductor to transform the phantom voltage signal. The inductor creates a phase-shifted version of the neutral wire signal, which when combined with the original signal, produces a voltage gap that can be amplified and detected with high precision.
Solution Approach 2:
The voltage sense amplifier changes the voltage parameter by amplifying the small voltage gap between the phase-shifted and original neutral wire signals. This transformation converts an undetectably small signal into a usable voltage level for reliable blackout detection.
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
This solution reduces the cost, time, and effort required for implementing emergency lighting systems by enabling seamless operation during power blackouts, ensuring continuous functionality of critical devices like LED lights, medical equipment, and high-precision machines.
Implementation Method 1
The coupled inductor device is configured to convert a voltage signal of the neutral wire to a 180-degree phase-shifted voltage signal of the neutral wire
Data Source
AI summary
A power blackout sensing system includes: a voltage regulator configured to receive one of three phase wires and a neutral wire of a primary power source that provides an alternating current (AC) power; a sensing block configured to receive the neutral wire of the primary power source and comprising a coupled inductor device and a voltage sense amplifier; and a secondary power source. The voltage regulator is coupled to a switch and generates a direct current (DC) voltage signal. The coupled inductor device of the sensing block comprises a pull-down resistor, wherein the coupled inductor device is configured to convert a voltage signal of the neutral wire to a 180-degree phase-shifted voltage signal of the neutral wire and generate a reference voltage signal using the pull-down resistor. The voltage sense amplifier is configured to amplify a voltage gap between the 180-degree phase-shifted voltage signal of the neutral wire and the reference voltage signal. The sensing block detects a phantom voltage on the one of three phase wires and provides an output signal corresponding the secondary power source during a blackout period.