LED Lighting Circuit with Switched Parallel Branches for Current Amplitude Compensation
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Solution Overview
Problem
Existing lighting circuits face challenges in efficiently managing different current amplitudes required by light emitting diodes (LEDs) with varying efficiencies, leading to suboptimal performance when using a single current source.
Innovation Solution
The proposed lighting circuit design incorporates a first circuit with a diode function, a capacitor, and a switch, and a second circuit with another switch, allowing for multiple current paths and duty cycle control to compensate for non-optimized current amplitudes, enabling the use of a single current source optimized for one LED arrangement while accommodating others.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single current source is used to power multiple LED arrangements with different efficiency requirements, then the device complexity is reduced, but the lighting efficiency and performance of individual LED arrangements deteriorate due to non-optimized current amplitudes
Solution Approach 1:
The circuit is segmented into multiple parallel branches, each containing LED arrangements with different efficiency characteristics. Each branch can be independently controlled through dedicated switches, allowing the current from a single current source to be distributed and optimized for each LED type separately.
Solution Approach 2:
The circuit incorporates switches that can dynamically control the connection state of each LED branch. By adjusting the duty cycles of these switches, the system can adapt the current distribution in real-time to match the different efficiency requirements of various LED arrangements, resolving the contradiction between using a single current source and maintaining optimal lighting efficiency.
2Use of energy by moving object
If separate current sources are used for each LED arrangement to optimize current amplitude, then lighting efficiency is improved, but the device complexity and number of components increase
Solution Approach 1:
A single current source is designed to serve multiple LED arrangements with different efficiency requirements simultaneously. The current source functions universally for all branches, while the parallel circuit structure and controllable switches provide the necessary differentiation to maintain optimal performance for each LED type without requiring separate current sources.
3Device complexity
If LEDs with different current requirements are connected in series, then the circuit structure is simplified, but the ability to provide optimized current amplitude for each LED arrangement is lost
Solution Approach 1:
Instead of connecting LEDs in series, the circuit segments LED arrangements into separate parallel branches. This segmentation maintains the simplicity of the overall circuit structure while enabling independent current control for each branch, thus preserving adaptability for current amplitude optimization.
Solution Approach 2:
The circuit uses periodic switching control with adjustable duty cycles to regulate the current delivered to each LED branch. This periodic action allows the system to provide optimized current amplitudes for different LED arrangements while maintaining a relatively simple parallel circuit structure.
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 design allows for efficient light production across LEDs with different efficiencies by controlling switches and duty cycles, ensuring optimal power delivery and consistent light output despite non-optimized current amplitudes.
Implementation Method 1
a first circuit comprising an element with a diode function, a capacitor, a first light emitting diode arrangement and a first switch, the element with the diode function being coupled serially to parallel branches, a first branch of the parallel branches comprising the capacitor
Implementation Method 2
a first light emitting diode arrangement and a first switch coupled serially to each other
Implementation Method 3
The lighting circuit comprises a parallel combination of first and second circuits... a first light emitting diode arrangement
Data Source
AI summary
A lighting circuit comprises a first circuit (1) with an element (31) with a diode function coupled serially to a parallel combination of a capacitor (41) and a serial combination of a first LED (21) and a first switch (11) and comprises a second circuit (2) with a second switch (12). The circuits (1, 2) are parallel circuits. The lighting circuit produces light in response to a supply current from a current source (6). The second switch (12), when conducting, lets the supply current pass and prevents it from flowing through the element (31), and, when non-conducting, blocks the supply current and it flows through the element (31). The first switch (11), when non-conducting, prevents the first LED (21) from producing some of the light, and, when conducting, allows the first LED (21) to produce some of the light. Power for the first LED (21) is delivered via the supply current when flowing through the element (31) or via a capacitor current supplied by the capacitor (41).