LED Power Supply Metal Shielding Tape EMC Layout
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Solution Overview
Problem
Miniaturization of LED power supplies is challenging due to electromagnetic compatibility issues, particularly at varying frequencies, and conventional solutions like potting glue increase costs and product size while complicating production.
Innovation Solution
The use of a metal shielding tape around the switching unit to redirect electromagnetic interference to the ground wire, allowing for a compact and efficient three-dimensional layout of electronic components, reducing the need for additional filter components and simplifying the production process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If potting glue is used to solve heat dissipation in compact LED power supplies, then heat dissipation is improved, but electromagnetic compatibility deteriorates due to the dielectric constant of the glue
Solution Approach 1:
The patent extracts the electromagnetic shielding function from the potting glue and implements it through a separate metal shielding structure. The metal shielding layer is positioned between the switching device and other components to block electromagnetic interference, while the potting glue focuses solely on heat dissipation and mechanical support functions.
Solution Approach 2:
The patent employs a composite approach by combining metal shielding material with the potting glue structure. The metal shielding layer is integrated into the housing or mounting structure, creating a composite solution that simultaneously addresses both thermal management and electromagnetic compatibility requirements.
2Object-affected harmful factors
If filter inductance and filter capacitor are added or increased to meet EMC standards, then electromagnetic compatibility is improved, but device complexity and product size increase
Solution Approach 1:
The metal shielding structure serves multiple functions simultaneously: it provides electromagnetic shielding, acts as a heat sink, and serves as a structural component of the housing. This multi-functional design eliminates the need for separate EMC filtering components, reducing overall device complexity.
Solution Approach 2:
The patent merges the electromagnetic shielding function with the existing housing and mounting structure by integrating the metal shielding layer into these components. This consolidation eliminates the need for separate filter inductors and capacitors, simplifying the overall device architecture.
3Object-affected harmful factors
If distance between switching power device and electromagnetic compatibility device is increased to suppress high-frequency electromagnetic waves, then electromagnetic compatibility is improved, but volume of power supply increases
Solution Approach 1:
The metal shielding layer acts as an intermediary barrier between the switching device and other components. It blocks electromagnetic interference without requiring increased physical distance, allowing compact component layout while maintaining EMC compliance.
4Object-affected harmful factors
If metal shield is used to improve electromagnetic compatibility, then electromagnetic compatibility is improved, but cost, production complexity, and product size increase
Solution Approach 1:
The metal shielding layer is integrated into the housing or mounting structure during existing manufacturing processes, combining multiple functions into single components. This approach avoids the need for separate shielding assemblies and reduces production complexity.
Solution Approach 2:
The patent employs thin metal shielding films or layers that can be easily applied to internal surfaces of the housing or mounting structures. These thin films provide effective electromagnetic shielding while adding minimal volume and complexity to the manufacturing process.
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 approach enhances electromagnetic compatibility at lower costs and in a smaller package size, meeting market demands while reducing production and product costs by minimizing component space and complexity.
Implementation Method 1
A metal shielding tape is provided on the periphery (around the circumference) of the switching unit, so that the electromagnetic interference generated by the switching unit is transferred to the ground wire via the metal shielding tape
Data Source
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AI summary
The invention discloses an LED power supply, comprising a circuit board assembly, which is provided with a high-voltage input terminal, a rectifier and filter circuit, a drive control module, a step-down transformer, a DC-DC circuit and an LED connection terminal that are electrically connected in series. The drive control module comprises at least a control unit and a switching unit, and the circuit board assembly comprises a main board and at least one first sub-board electrically connected to and being perpendicular to the main board. The first sub-board is provided with the drive control module. In the LED power supply of the present invention, the circuit board is modularized, in the form of a plug-in board, the three-dimensional layout of the electronic components, the compact size between the components, can greatly reduce the overall size of the product, and meet the requirements of product miniaturization.