Switchable CCT Illuminating Device with Reverse Parallel Filaments
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Solution Overview
Problem
Existing LED illuminating devices with fixed Correlated Color Temperature (CCT) require replacement to change CCT, leading to economic loss, reduced safety, and increased complexity in production and assembly, due to the need for multiple guide wires and increased labor costs.
Innovation Solution
A switchable CCT illuminating device with a CCT switching unit that connects two light-emitting unit groups in reverse parallel, reducing the number of guide wires and using a constant current source for stable performance, along with a mechanical or control circuit for easy CCT switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple filaments with different CCT are used to achieve switchable CCT, then the CCT switching function is improved, but the number of guide wires increases and the stem may crack
Solution Approach 1:
The patent combines multiple light-emitting units with different CCT values into a single filament structure. The first and second light-emitting unit groups are arranged on the same substrate and electrically connected in reverse parallel, sharing common lead-out electrodes and guide wires. This merging approach achieves CCT switching functionality while reducing the number of guide wires from at least three to only two, thereby preventing stem cracks and improving reliability.
Solution Approach 2:
The single filament structure is designed to perform multiple functions by integrating both first and second light-emitting unit groups on one substrate. This multi-functional filament can emit different CCT values (first CCT and second CCT) by switching between the two light-emitting unit groups, eliminating the need for separate filaments and reducing the complexity of the guide wire system.
2Adaptability or versatility
If multiple filaments with different CCT are used to achieve switchable CCT, then the CCT switching function is improved, but the number of spot welding increases and manufacturing cost increases
Solution Approach 1:
The patent merges multiple light-emitting units into a single filament with shared lead-out electrodes and guide wires. This reduces the number of spot welding connections required compared to using separate filaments, thereby simplifying the manufacturing process and reducing labor costs and manufacturing costs.
3Ease of operation
If all LEDs are switched on or off simultaneously to simplify control, then the control complexity is reduced, but the CCT cannot be changed during operation
Solution Approach 1:
The patent implements a dynamic control system where the CCT can be changed during operation by switching between the first and second light-emitting unit groups. The control circuit enables flexible switching of different LED groups based on required CCT values, allowing the illuminating device to adapt to different lighting scenarios while maintaining relatively simple control through reverse parallel connection.
4Adaptability or versatility
If the number of guide wires is increased to support multiple filaments, then the CCT switching function is improved, but the assembling difficulty increases
Solution Approach 1:
The patent merges multiple light-emitting units into a single filament structure that shares common lead-out electrodes and guide wires. This reduces the number of guide wires from at least three to only two, significantly simplifying the assembly process and reducing assembling difficulty while maintaining the CCT switching function.
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 enhances safety and service life by reducing guide wire stress, simplifies assembly and production, and allows for convenient CCT switching without excessive cost or complexity, while maintaining stable performance and compatibility with dimming modes.
Implementation Method 1
A light-emitting diode (LED) illuminating device in the prior art comprises a plurality of LEDs arranged on a circuit board
Implementation Method 2
a first light-emitting unit group and a second light-emitting unit group arranged on the substrate and electrically connected with the CCT switching unit. Each of the first light-emitting unit group and the second light-emitting unit group comprises more than one light-emitting unit
Data Source
AI summary
Provided is a switchable Correlated Color Temperature (CCT) illuminating device. The device may include a CCT switching unit, forming electrical connection with a drive power source, and a bulb shell, at least one filament being arranged inside the bulb shell, the filament including a substrate, and a first light-emitting unit group and a second light-emitting unit group arranged on the substrate and forming electrical connection with the CCT switching unit. Each of the first light-emitting unit group and the second light-emitting unit group comprises one or more light-emitting unit, the first light-emitting unit group and the second light-emitting unit group are connected in parallel and conducting directions thereof are opposite, and when one of the first light-emitting unit group and the second light-emitting unit group is in a positive ON status, the other is in a negative OFF status. When the CCT switching unit is in a first operating mode, the first light-emitting unit group is in the positive ON status, and the CCT switchable illuminating device emits light with a first CCT. When the CCT switching unit is in a second operating mode, the second light-emitting unit group is in electrical conduction, and the CCT switchable illuminating device emits light with a second CCT. Therefore, the problem that the illuminating device in the prior art has a single CCT is solved.