LED Lighting Device Heat Distribution via Resistor Extraction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional LED switching circuits generate excessive heat and require large size due to the inclusion of voltage sensing or period sensing circuits, limiting the number of LEDs that can be added and increasing power consumption and the risk of malfunctions.
Innovation Solution
An LED lighting device design that eliminates input voltage sensing circuits, uses a resistor to distribute heat away from the switch unit, and includes a current sensing resistor to control switches based on the sum of currents flowing through adjacent switches, allowing for efficient dimming control and flicker prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a voltage sensing circuit or period sensing circuit is included in the switching circuit, then the LED can be controlled according to input voltage, but the entire size becomes too big and the area to include more LEDs is reduced
Solution Approach 1:
The patent removes the voltage sensing circuit and period sensing circuit from the switching circuit, extracting the problematic components that caused the area increase. The switching circuit is simplified to only include the necessary switching elements without the bulky sensing circuits, thereby reducing the overall area while maintaining LED control functionality through alternative means.
2Power
If the switching circuit is formed by FET and operates at high input voltage, then the LED can be driven at rated voltage, but a significant amount of heat generates at the switching circuit
Solution Approach 1:
The patent converts the harmful heat generation at the switching circuit into a beneficial distributed heat pattern. By removing the sensing circuits and simplifying the switching architecture, the heat is no longer concentrated at sensitive components but is instead distributed across the circuit in a manageable pattern, turning the heat problem into a solvable thermal management issue.
Solution Approach 2:
The patent introduces a resistor as an intermediary element to manage the heat generation. The resistor is strategically placed to distribute the heat away from the switch unit, acting as a thermal mediator that protects the sensitive switching components while still allowing high voltage operation.
3Power
If high amperes current flows through the switching circuit at rated voltage, then the LED operates at full power, but a significant amount of heat generates reducing efficiency and increasing malfunction risk
Solution Approach 1:
The patent converts the harmful concentrated heat at the switching circuit into a beneficial distributed heat pattern by removing the sensing circuits and using a resistor to spread the thermal load. This allows high current operation for full LED power output while managing the thermal efficiency loss through distributed heat generation rather than concentrated heat at sensitive components.
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
The solution reduces heat generation at the switch unit, decreases power consumption, increases efficiency, prevents flicker, and allows for economic dimming control while protecting the switch unit from overheating.
Implementation Method 1
the switch unit is protected by generating heat at a resistor to distribute the heat generation
Implementation Method 2
controlled by a sum of a current of the nth switch and a current of an (n+1)th switch, which flows through the current sensing resistor
Data Source
AI summary
The purpose of the present invention is to reduce heat generated through a switching IC circuit in order to protect a switching IC circuit by connecting a resistor to an LED unit in which a plurality of LEDs are connected so as to disperse heat in the resistor when a rated voltage or more is inputted. To this end, the LED lighting device comprises: a rectification circuit unit for receiving input power from a power source unit and outputting a rectified power; an LED unit having a plurality of LED channels connected in series and a resistor unit connected to the last end of the LED channels; a current sensing resistor; and a switch circuit unit comprising a plurality of switches, wherein an nth switch is connected to the rear end of an nth LED channel so as to control an operation of the nth LED channel and is controlled by a sum of a current of the nth switch and a current of an (n+1)th switch, which flows through the current sensing resistor.