LED Filament Lamp Control With Fewer Stem Connections
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Solution Overview
Problem
The increasing complexity and cost of manufacturing LED filament lamps with multi-channel control are exacerbated by the need for multiple electrical connections through the glass stem, which also reduces the reliability of the bulb.
Innovation Solution
A LED filament lamp design with a controller within the chamber and a driver circuit outside the chamber, utilizing either a separate control line or one of the powerlines to convey control signals, reducing the number of electrical connections required through the stem.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional electrical connections are added through the glass stem to enable multi-channel control of LED segments, then the control capability is improved, but the manufacturing complexity and cost increase, and the reliability of the stem seal deteriorates
Solution Approach 1:
The patent combines the control signal transmission function with the existing power transmission lines. The driver circuit uses the same electrical connections that supply power to also convey control signals to the controller, thereby eliminating the need for additional separate control lines through the glass stem. This merging of functions resolves the contradiction by achieving multi-channel control without increasing the number of physical connections.
Solution Approach 2:
The electrical connections through the glass stem are designed to serve multiple functions: both power transmission and control signal transmission. The driver circuit is configured to utilize these universal connections for dual purposes, allowing the same physical infrastructure to support both energy supply and control operations, thus avoiding the need for dedicated control lines.
2Adaptability or versatility
If additional electrical connections are added through the glass stem to enable multi-channel control of LED segments, then the control capability is improved, but the reliability of the stem seal deteriorates
Solution Approach 1:
The patent merges control signal transmission with existing power lines, eliminating the need for additional penetrations through the glass stem. Each electrical connection serves dual purposes, so no extra holes or seals are required in the stem, preserving the integrity and reliability of the stem seal while still enabling multi-channel control.
3Adaptability or versatility
If additional electrical connections are added through the glass stem to enable multi-channel control of LED segments, then the control capability is improved, but the manufacturing cost increases
Solution Approach 1:
The patent combines multiple functions into existing components. The driver circuit and controller utilize the same electrical connections for both power and control, eliminating the need for additional separate control wiring through the stem. This reduces material costs, assembly complexity, and manufacturing steps, thereby lowering overall production costs while maintaining multi-channel control capability.
Data Source
AI summary
The invention provides a LED filament lamp comprising: an envelope enclosing a chamber sealed with a stem, wherein the stem extends into said chamber; a LED filament structure with at least two individually controllable segments; a controller configured to receive a control signal and control each of the at least two individually controllable segments based on said control signal, wherein the LED filament structure and the controller are arranged within the chamber; a driver circuit arranged outside the chamber, wherein the driver circuit comprises two powerlines extending through the stem or the envelope for powering the LED filament structure and the controller, wherein the driver circuit is configured to convey said control signal to the controller via a control line extending through the stem or the envelope.