Emergency Light Indicator Circuit with Battery State Feedback
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Solution Overview
Problem
Existing emergency lights are unable to turn on an indicator light in normal conditions or turn it off in abnormal conditions, failing to meet safety requirements despite having a replaceable battery.
Innovation Solution
An indicator circuit comprising a charging circuit, battery protection circuit, main control circuit, and drive circuit, which charges a lithium battery, provides overvoltage and overcurrent protection, compares the battery signal with a reference voltage, and controls the indicator light to illuminate in normal conditions and turn off in abnormal conditions, with the ability to recognize the battery's state, including when it is unplugged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a switch is used to control battery connection/disconnection, then the battery can be replaced, but the indicator light cannot be properly controlled to meet safety requirements
Solution Approach 1:
The patent implements a feedback mechanism where the control circuit continuously monitors the battery voltage and automatically adjusts the indicator light control state based on the detected voltage level. This feedback loop enables the system to recognize battery status (normal, low voltage, or unplugged) and automatically control the indicator light accordingly, eliminating the need for manual switch operation while maintaining reliable indicator control that meets safety requirements.
Solution Approach 2:
The system performs self-diagnosis of battery status through voltage detection and automatically controls the indicator light without requiring user intervention. The control circuit independently monitors battery conditions and adjusts the indicator state based on detected voltage levels, enabling the system to serve itself in recognizing battery status and controlling the indicator, thereby maintaining both battery replaceability and indicator control reliability.
Data Source
AI summary
An indicator circuit for an emergency light, including: a charging circuit, in connection with a positive terminal of a lithium battery and configured to charge the lithium battery; a battery protection circuit, in connection with a negative terminal of the lithium battery and configured to provide protection against overvoltage and overcurrent of an electrical signal output by the lithium battery; a main control circuit, in connection with the negative terminal of the lithium battery and configured to compare the electrical signal output by the lithium battery with a reference voltage signal and output a control signal; and a drive circuit, in connection with the main control circuit and an indicator light, and configured to drive the indicator light to illuminate according to the control signal and turn off the indicator light in case of abnormal conditions.