LED Board Over-Current Protection Circuit
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Solution Overview
Problem
Existing LED lighting systems face safety issues due to over-current risks when LED drivers are configured incorrectly, leading to potential overheating and fire hazards, with existing thermal protection methods being slow to respond and increasing costs and complexity.
Innovation Solution
An LED board with a current sensor and a cut-off switch controlled by a switch control circuit, allowing for local over-current protection without the need for external communication, using low-cost surface mount components and consuming minimal power, with optional temperature sensing for comprehensive protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal protection using temperature sensors connected through cables is used, then overheating detection is achieved, but device complexity and cost increase due to additional cables and connections
Solution Approach 1:
The protection function is extracted from the driver and placed locally on the LED board. The current sensor and cut-off switch are integrated directly on the LED board, eliminating the need for cable connections to the driver for protection functionality.
Solution Approach 2:
The LED board performs self-protection by monitoring its own current consumption and automatically triggering the cut-off switch when over-current conditions are detected, without requiring external control from the driver.
2Reliability
If thermal protection using thermal fuses is used, then overheating protection is achieved, but response time is slow and the LED board must be replaced after triggering
Solution Approach 1:
The mechanical thermal fuse is replaced with an electronic protection system using a current sensor and controllable cut-off switch. This electronic system provides much faster response time and can be reset without replacing the entire LED board.
3Adaptability or versatility
If a configurable LED driver is used, then adaptability to different LED types is improved, but safety risk increases due to potential incorrect configuration leading to over-current
Solution Approach 1:
The protection system acts in advance to prevent over-current damage. By continuously monitoring the current and having a ready-to-trigger cut-off switch, the system prevents the harmful effect before it can cause damage to the LEDs.
Solution Approach 2:
The protection system uses feedback from the current sensor to control the cut-off switch. When the sensed current exceeds the threshold, the feedback loop triggers the cut-off switch to open, stopping the current flow and protecting the LEDs.
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
Enables rapid detection and prevention of over-current conditions, reducing the risk of overheating and damage, while maintaining system efficiency and simplicity, with the ability to trigger and reset the protection mechanism as needed.
Implementation Method 1
a current sensor for sensing a current flowing through the arrangement of LEDs
Implementation Method 2
a cut-off switch in series with the arrangement of LEDs; controlling the cut-off switch in dependence on the sensed current
Data Source
AI summary
An LED board comprises an arrangement of LEDs, a current sensor for sensing a current flowing through the arrangement of LEDs and a cut-off switch in series with the arrangement of LEDs. The cut-off switch is controlled in dependence on the sensed current. In this way, over-current protection is provided at the LED board level, without needing any signal communication between the LED board and the LED driver.