Phantom Voltage Detector for Emergency Lighting Blackout Sensing
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Solution Overview
Problem
Existing emergency lighting systems require costly and time-consuming installation of a permanent live power supply, which is not feasible for all applications, especially during power blackouts.
Innovation Solution
A power blackout sensing system that includes a primary AC power source, a secondary power source, and a phantom voltage detector, which utilizes parasitic capacitances to differentiate between a switch-off and power blackout conditions, providing a secondary power source during blackouts to connected devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a permanent live power supply is installed for emergency lighting systems, then the system can operate during power blackouts, but the installation becomes costly and time-consuming
Solution Approach 1:
The patent introduces a phantom voltage detector as an intermediary device that detects residual voltages on power lines to distinguish between switched-off and blackout conditions. This mediator enables the emergency lighting system to operate during blackouts without requiring permanent live power supply installation, thereby resolving the contradiction between reliability and ease of manufacture
Solution Approach 2:
The system uses the existing power line infrastructure and detects phantom voltages that already exist on the lines to determine blackout conditions. Instead of requiring additional permanent power installation, the system serves itself by utilizing the electrical characteristics of the existing power distribution network
2Reliability
If a permanent live power supply is installed, then emergency lighting can function during outages, but the implementation complexity increases
Solution Approach 1:
The phantom voltage detector acts as an intermediary that simplifies the power supply infrastructure by providing intelligent detection of blackout conditions through residual voltage measurement. This eliminates the need for complex dual power supply systems while maintaining continuous operation capability
Solution Approach 2:
The phantom voltage detector serves multiple functions: it detects blackout conditions, distinguishes between switched-off and blackout states, and triggers the emergency power source. This multi-functionality reduces the overall device complexity compared to dedicated separate systems
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 eliminates the need for permanent power supply installation, reducing costs and time, and ensures seamless operation of emergency lighting and other critical systems during power outages.
Implementation Method 1
a rectifier configured to rectify the AC power from the primary power source and providing a rectified power to the sensing block
Implementation Method 2
which utilizes parasitic capacitances to differentiate between a switch-off and power blackout conditions
Data Source
AI summary
A power black-out sensing system includes: a primary power source providing an alternating current (AC) power using three phase wires and a neutral wire; a secondary power source; a sensing block comprising one or more sensing elements; and a rectifier configured to rectify the AC power from the primary power source and providing a rectified power to the sensing block voltage detector. Two wires of the three phases wires and the neutral wire of the primary power source are connected to rectifier, and a first wire of the two wires is connected to the rectifier via a switch and a second wire of the two wires is directly connected to the rectifier. The sensing block detects a phantom voltage and provides an output signal corresponding the secondary power source during a blackout period.