Printed Circuit Board for Lamp with Front and Back LED Segmentation
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Solution Overview
Problem
Current circuit boards for lamps with light-emitting diodes (LEDs) face complexities in wiring and logistical efforts due to the need for LEDs of the same voltage bin for both direct and indirect lighting, and the inefficiency in using LEDs on both sides of the board, which limits flexibility and increases production costs.
Innovation Solution
A printed circuit board design that allows LEDs of different voltage bins to be used on the front and back sides, with the option to use 1-chip and 2-chip LEDs, and the use of zero-ohm resistors for bridging, enabling flexible LED selection and proportion control for direct and indirect light emission, while ensuring even current flow and minimizing logistical efforts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LEDs of the same voltage bin are used on both front and back sides of the printed circuit board, then even current flow and uniform LED operation is ensured, but logistical efforts increase due to binning requirements and flexibility in LED selection is reduced
Solution Approach 1:
The circuit board is divided into front and back sides, each with independent LED mounting areas. The front side contains first circuit branches with first LEDs, while the back side contains second circuit branches with second LEDs. This segmentation allows independent selection of LEDs from different voltage bins on each side, eliminating the need for binning while maintaining balanced current distribution through separate circuit paths.
Solution Approach 2:
Different regions of the circuit board (front and back sides) are assigned different LED types with different voltage characteristics. The front side can use LEDs from one voltage bin while the back side uses LEDs from another voltage bin, allowing local optimization of LED selection based on specific lighting requirements without affecting the other side.
2Adaptability or versatility
If separate light modules with different operating devices are used for direct and indirect lighting, then lighting functionality is achieved, but wiring complexity and space requirements increase
Solution Approach 1:
The patent combines direct and indirect lighting functionalities into a single integrated circuit board. The front side LEDs provide direct lighting while the back side LEDs provide indirect lighting, both powered by the same operating device. This merging eliminates the need for separate light modules and their associated wiring, reducing overall system complexity while maintaining both lighting modes.
Solution Approach 2:
The single circuit board is designed to perform multiple functions: it provides both direct lighting through front side LEDs and indirect lighting through back side LEDs. The circuit board universally supports different LED types and configurations, allowing it to replace multiple specialized modules while simplifying the overall lighting system architecture.
3Ease of manufacture
If the front side is populated with LEDs in a first manufacturing step and the back side in a second step, then production flexibility is achieved, but the need for voltage bin coordination increases logistical complexity
Solution Approach 1:
The manufacturing process is segmented into independent steps for the front and back sides. Each side can be populated with LEDs from different voltage bins without requiring coordination between the two sides, as they have independent circuit branches. This segmentation eliminates the logistical complexity of tracking voltage bin usage across the entire board while maintaining production flexibility.
Data Source
Figure 1~2
Figure 3~5
AI summary
The invention relates to a printed circuit board (9) for a lamp (1), having a plurality of circuit paths having a multiplicity of light-emitting diodes (8, 12), wherein the light-emitting diodes in a circuit path are each connected up in series with one another and the circuit paths are connected in parallel with one another, wherein a first number of light-emitting diodes (LD11, LD15, LD21, LD25, LD31 LD35, LD41, LD45, LD51, LD55, LD61, LD65) in a circuit path are fitted on a front of the printed circuit board and a second number of light-emitting diodes (LDi11, LDi31, LDi52) in the same circuit path are fitted on a back of the printed circuit board.