Induction Lighting with Homogenizing Light Guide
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Solution Overview
Problem
Existing LED lighting devices powered by induction have low efficiency and inconsistent luminous flux due to disparities in LED characteristics, requiring frequent adaptation of printed circuits and primary windings, and often result in non-homogeneous light distribution.
Innovation Solution
A lighting device with a transparent light guide featuring diffusing patterns and a spiral inductor, where LEDs are connected in series with a capacitor and rectifier, and controlled by a unit that adjusts luminosity based on motion sensors and remote control data, ensuring homogeneous luminous flux and adaptable lighting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LEDs are connected in parallel to the secondary winding, then the lighting device can be powered by induction, but the luminous flux intensity and color are not controlled due to LED characteristic disparities
Solution Approach 1:
The patent introduces a light guide as an intermediary between the LEDs and the external environment. The light guide receives luminous flux from multiple LEDs with different characteristics and homogenizes it before output, thereby decoupling the LED characteristic disparities from the final luminous flux quality.
Solution Approach 2:
The light guide is specifically designed to homogenize the luminous flux by redistributing light from LEDs with varying characteristics. This creates a uniform output light distribution that compensates for the inherent disparities in LED performance.
2Adaptability or versatility
If multiple sets of LEDs are connected in parallel, then the lighting device can operate with induction power, but the efficiency is reduced and luminous flux control is lost
Solution Approach 1:
The light guide acts as a mediator that allows multiple LEDs to work together efficiently by combining their output into a homogenized luminous flux, thereby maintaining system efficiency despite the complexity of multiple parallel LED connections.
3Adaptability or versatility
If the printed circuit board is adapted to different LED configurations, then various LED types can be used, but the device complexity increases
Solution Approach 1:
The light guide serves as a universal intermediary that can accept luminous flux from various LED configurations without requiring complex adaptations of the supporting circuitry. This simplifies the overall device design while maintaining versatility.
4Illumination intensity
If a convex shape is used on the underside of the light guide, then light distribution is modified, but the exiting light scatters from that side
Solution Approach 1:
The patent applies different surface characteristics to different parts of the light guide. The underside may have a convex shape for specific light distribution, while the exit face maintains optical quality for controlled light output, thereby achieving local optimization of different functions.
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 lighting efficiency by homogenizing luminous flux and allowing for adjustable intensity and color temperature, compensating for LED disparities and improving overall lighting performance.
Implementation Method 1
a secondary winding consisting of a spirally wound wire is provided on one side of the printed circuit board... The housing is attached to a socket containing a primary winding that acts as an inductor for the secondary winding
Implementation Method 2
at least one main face of the guide having diffusing elements or patterns... This allows a homogeneous luminous flux to be obtained exiting the guide from at least one of its two main faces
Implementation Method 3
several LEDs connected to the inductor... the LEDs and the guide are arranged so that the luminous flux emitted by the LEDs is, at least in large part, introduced (injected) into the guide
Data Source
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AI summary
The invention relates to a lighting apparatus (20) comprising an inductor (22), a plurality of LEDs (23, 24) connected to the inductor, and a casing (21) containing the LEDs, the casing having opaque walls surrounding an opening. The apparatus further includes a transparent lightguide (27), at least one main face of the lightguide having diffusing elements or features, the lightguide extending opposite the opening, the LEDs and the lightguide being arranged so that the light flux emitted by the LEDs is, at least partly, injected into the lightguide via at least one edge of the lightguide.