Emergency Light Circuit for Power Failure vs Switch-Off Detection
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Solution Overview
Problem
Existing emergency lights with built-in batteries struggle to intelligently determine whether a home power supply failure has occurred or if the switch is turned off, leading to inefficient operation.
Innovation Solution
An emergency light system that includes a lighting module, an input unit for receiving alternating voltage, a rectifying circuit, a normal lighting control circuit, and an emergency lighting control circuit. The emergency lighting control circuit detects alternating voltage and resistance values between input terminals to determine power supply failure, triggering the battery to drive the lighting module to emit lights when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the emergency light is electrically connected to mains supply via a wall switch, then the light can be controlled to emit during power supply failure, but it cannot distinguish between switch being turned off and actual power supply failure
Solution Approach 1:
The patent introduces an emergency lighting control circuit as an intermediary between the input unit and lighting module. This control circuit measures both the alternating voltage at the input terminals and the resistance between terminals to determine the actual power supply status, thereby distinguishing between switch-off state and power failure state. The control circuit acts as a mediator that processes multiple signals to make accurate decisions about when to activate emergency lighting.
2Ease of operation
If the emergency light works when switch is turned off, then the light provides unnecessary illumination, but if it doesn't work during power supply failure, then it fails to meet user needs
Solution Approach 1:
The emergency lighting control circuit implements feedback by continuously monitoring the alternating voltage and resistance between input terminals. Based on this feedback information, the control circuit intelligently decides whether to activate the lighting module. When the switch is off (high resistance detected), the circuit remains inactive even if voltage is present, preventing unnecessary energy consumption. When power supply failure is detected (low voltage and appropriate resistance), the circuit activates to provide necessary illumination.
3Reliability
If the emergency light uses only voltage detection, then the control circuit is simple, but it cannot accurately determine power supply failure vs switch off state
Solution Approach 1:
The emergency lighting control circuit performs multiple functions: it measures alternating voltage at the input terminals, measures resistance between terminals, processes both measurements, and controls the lighting module activation. By integrating these multiple functions into a single control circuit, the patent achieves accurate power supply status determination without proportionally increasing system complexity. The control circuit universally handles both measurement and control tasks.
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
Ensures the emergency light operates during home power supply failures regardless of switch status and turns off during normal conditions, meeting user needs by accurately detecting power supply status.
Implementation Method 1
a rectifying circuit connected to the input unit to receive the alternating voltage and output a first direct voltage
Implementation Method 2
a battery; and an emergency lighting control circuit connected to the two input terminals and the battery
Implementation Method 3
a lighting module configured for emitting lights
Data Source
AI summary
An emergency light includes a lighting module configured for emitting lights, an input unit configured for receiving a power supply voltage from a home power supply, a normal driving module connected to the input unit to receive the power supply voltage and configured to output a first driving signal to drive the lighting module emit lights when the home power supply is normal; and an emergency control and battery module connected to the two input terminals and the lighting module. The emergency control and battery module is configured for detecting the alternating voltage of the input unit and a resistance value between the two input terminals to determine whether the home power supply failure occurs. When the home power supply failure occurs, the emergency control and battery module provides a second driving signal to drive the lighting module emit lights.