Heat Insulation Structure for LED Driver Capacitor Thermal Management
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Solution Overview
Problem
In LED illumination devices, the proximity of high-temperature components to capacitors leads to increased capacitor temperatures, reducing their lifespan and requiring costly high-temperature capacitors and plastic housings, which increase product volume and design complexity.
Innovation Solution
A heat insulation structure with a gap between high-temperature and low-temperature components, using insulators with different thermal resistances to prevent heat transfer and a compact design that includes a housing with specific medium fillings for efficient heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-temperature capacitors are used to withstand heat from nearby components, then capacitor reliability is improved, but product cost increases
Solution Approach 1:
A heat insulating structure is introduced as an intermediary between the capacitor and high-temperature components (MOSFET, transformer). This insulating structure blocks heat transfer from the power components to the capacitor, allowing the use of standard low-cost capacitors instead of expensive high-temperature rated capacitors while maintaining reliable operation
Solution Approach 2:
The heat source is extracted from the capacitor's thermal environment by removing the heat conduction path. The heat insulating structure effectively separates the capacitor from the heat-generating components, isolating the capacitor from thermal stress without requiring expensive high-temperature capacitor variants
2Temperature
If plastic housings are used to wrap capacitors for thermal protection, then capacitor temperature is reduced, but product volume and design complexity increase
Solution Approach 1:
The complex plastic housing structure is removed entirely. Instead of using molded plastic cases with mounting holes, the patent employs simple heat insulating materials (such as insulating sheets or air gaps) that can be easily implemented without adding structural complexity or increasing product volume
Solution Approach 2:
Rather than enclosing the entire capacitor in a complex plastic housing, the solution applies localized thermal insulation only where heat transfer occurs between the capacitor and nearby power components. This targeted approach provides thermal protection without the overhead of a complete housing structure
3Reliability
If mounting holes are added to the circuit board for fixing plastic housings, then capacitor protection is improved, but assembly difficulty and space occupation increase
Solution Approach 1:
The mounting holes and their associated assembly steps are completely removed from the design. The heat insulating structure is implemented in a manner that does not require modifications to the circuit board, eliminating the need for drilling, tapping, and fastening operations
Solution Approach 2:
The heat insulating function is merged with existing structural elements or implemented as a simple layer between components, rather than being a separate attached component requiring mounting holes. This integration eliminates additional assembly steps and board modifications
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
This solution effectively reduces capacitor temperatures, prolongs their lifespan, and reduces costs by using low-cost materials and simplifying assembly, while maintaining compactness and stability in the illumination device.
Implementation Method 1
a heat insulation structure, wherein the second electrical component is separated from the first electrical component by means of the heat insulation structure
Implementation Method 2
a gap is provided between the first heat insulator and a second heat insulator
Data Source
Figure 1~2
Figure 3~4
AI summary
Electric driver comprising: a carrier (1) in the form for instance of a PCB; a first electrical component (10) and a second electrical component (20), wherein the first electrical component (10) and the second electrical component (20) are provided on the carrier (1); and a heat insulation structure (2), wherein the second electrical component (20) comprises a first heat insulator (21) surrounding the second electrical component (20) and a second heat insulator (22) surrounding the first heat insulator (21), wherein a gap (3) is provided between the first heat insulator (21) and a second heat insulator (22). The proposed electric driver improves the lifetime of the second electrical component (20) as the heat insulation structure (2) provides a thermal insulation to said second electrical component (20) with respect to the first electrical component (10). This can be particularly advantageous when the second electrical component (20) consists in an electrolytic capacitor, which is particularly sensitive to the temperature.