Light Strip Unplug Detection Circuit and Protection Method
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Solution Overview
Problem
Existing LED light strip systems lack a mechanism to detect unplugging, leading to potential damage to the driving circuit and motherboard when users hot unplug the light strip while the system is powered on.
Innovation Solution
A light strip unplugging detection circuit and system that includes a socket with power and control pin holders, a driving control logic circuit, a switch circuit, and a comparison circuit. This system uses a pulse-width modulation signal to detect whether the light strip is unplugged by monitoring the voltage or current on the control pin holders and turning off the power supply if unplugged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the light strip is unplugged while the system is powered on, then the user can replace the light strip, but the driving circuit and motherboard may be damaged
Solution Approach 1:
The detection circuit monitors the control pin status before damage can occur. When unplugging is detected (control pin voltage returns to idle level), the system proactively shuts off power to the light strip circuit, preventing harmful current flow that would damage the motherboard or driving circuit during replacement operations
2Adaptability or versatility
If the light strip is plugged in, then the light strip can be controlled, but there is no way to detect unplugging status
Solution Approach 1:
The detection circuit continuously monitors the voltage level on the control pin and feeds back the unplugging status to the control logic. When the control pin voltage returns to the idle level (indicating unplugging), the system receives feedback and automatically responds by shutting off power, enabling the system to adapt its operation based on the detected status
Data Source
AI summary
A light strip unplugging protection method includes: providing a light strip, wherein the light strip includes a plug including a power pin and a control pin; providing a socket corresponding to the plug, wherein the socket includes a power pin holder and at least one light strip control pin holder for electrically connecting with the power pin and the light strip control pin respectively; using a pulse-width modulation signal to drive the light strip on the light strip control pin holder to control the current passing therethrough; and when the pulse-width modulation signal is in a first state, detecting voltage or current of the light strip control pin holder; determining whether the light strip is unplugged according to the voltage or current; and when it is determined that the light strip is unplugged, power voltage on the power pin holder is turned off.