Solid-State Lighting Circuit with Current Bias for Dynamic Color Control
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Solution Overview
Problem
Existing solid-state lighting (SSL) systems lack efficient methods to dynamically change the color output in response to varying current levels, often requiring complex driving circuits and multiple controls to adjust brightness and color temperature.
Innovation Solution
A solid-state lighting circuit that includes a current limiting circuit and biasing resistors, allowing a constant current power supply to preferentially direct current to a first group of emitters until a preselected limit is reached, after which current is routed to a second group, enabling a seamless transition from a first color to a blended or dominant second color as current increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If complex driving circuits and multiple controls are used to adjust brightness and color temperature, then color output can be dynamically changed, but device complexity increases
Solution Approach 1:
The patent combines multiple emitter groups (first group emitting first color, second group emitting second color) into a single circuit configuration controlled by one constant current power supply. The current naturally distributes between groups based on their forward voltage characteristics, eliminating the need for separate driving circuits for each color group and reducing overall system complexity while maintaining dynamic color adjustment capability
Solution Approach 2:
The constant current power supply serves multiple functions simultaneously: it provides current limiting protection, enables dynamic color adjustment, and controls brightness for multiple emitter groups. This single component replaces what would traditionally require multiple specialized control circuits, achieving versatility without proportionally increasing complexity
2Measurement precision
If multiple controls are used to adjust brightness and color temperature, then precise control is achieved, but ease of operation decreases
Solution Approach 1:
The constant current power supply is designed to simultaneously control multiple parameters (brightness and color temperature) through a single control interface. By adjusting the current level, the system automatically transitions between different color outputs and brightness levels, eliminating the need for separate controls while maintaining precise adjustment capability
Solution Approach 2:
The system utilizes changes in current parameter to simultaneously control both brightness and color temperature. As current increases, the relative activation of different emitter groups changes, naturally producing both brightness adjustment and color transition effects from a single parameter change, simplifying the user interface while preserving control precision
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 solution simplifies the driving circuitry, allows for dynamic color and brightness adjustment using a single control, and reduces operational costs by enabling efficient power management and color transition in SSL devices.
Implementation Method 1
The first plurality of emitters can be configured to output light of a first color and a second plurality of emitters can be configured to output light of a second color
Implementation Method 2
solid-state lighting (SSL) refers to a type of lighting in which light is emitted from a semiconductor
Data Source
AI summary
In an embodiment, a solid-state lighting circuit is included herein having a first plurality of emitters configured to output light of a first color and a second plurality of emitters configured to output light of a second color. The circuit further includes a current limiting circuit and at least one biasing resistor operably connected to the first plurality of emitters and the current limiting circuit. Current is biased toward the first plurality of emitters until a preselected current limit is reached for the first plurality of emitters, such that the first plurality of emitters outputs the light of the first color. When current is provided by the constant current power supply that is at or above the preselected current limit, current passes through the second plurality of emitters such that the second plurality of emitters outputs the light of the second color. Other embodiments are also included herein.