LED Circuit Arrangement with Reactive Element and Switching Modes
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Solution Overview
Problem
Existing LED driving circuits are inefficient due to high losses and are costly, especially for high-power LEDs, and they lack scalability for general illumination applications.
Innovation Solution
A LED circuit arrangement that operates in low and high voltage modes based on current levels, using a reactive element and controllable switching means controlled by a unit, allowing efficient operation with a simple and cost-effective voltage source, reducing loss and enabling scalable designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a series resistor is used to limit maximum current, then the circuit is simple to implement, but energy losses are high and efficiency is poor
Solution Approach 1:
The patent uses a switching circuit that changes the operating parameters of the LED by switching between different configurations (series and parallel connections of LED strings). This allows the circuit to operate efficiently at different current levels without the continuous energy loss associated with resistive current limiting, resolving the contradiction between simplicity and energy efficiency.
Solution Approach 2:
The patent employs periodic switching between different LED string configurations to control current flow. The switching circuit periodically alternates between series connection (higher voltage, lower current) and parallel connection (lower voltage, higher current) modes, enabling efficient current control without continuous resistive losses, thus improving energy efficiency while maintaining circuit simplicity.
2Loss of energy
If elaborate driving circuits are used to improve efficiency, then energy losses are reduced, but circuit complexity and cost increase
Solution Approach 1:
The patent divides the LED load into multiple independent strings that can be switched between series and parallel connections. This segmentation allows the use of a simple switching circuit instead of complex continuous regulation circuits, achieving good energy efficiency with minimal circuit complexity by controlling each string configuration independently.
Solution Approach 2:
The patent introduces dynamic switching capability that allows the circuit to adapt between different operating modes (series/parallel configurations) based on required current levels. This dynamic reconfiguration enables the circuit to maintain high efficiency across varying operating conditions without requiring complex continuous regulation, thus reducing both energy loss and circuit complexity.
3Ease of manufacture
If fixed configuration circuits are used, then manufacturing is simple, but adaptability to different LED types and numbers is limited
Solution Approach 1:
The patent designs the LED circuit with multiple switchable configurations that can accommodate different LED types, quantities, and arrangements. The switching circuit can reconfigure LED strings in series or parallel, allowing the same circuit design to work with various LED specifications and application requirements, thus providing universal adaptability while maintaining manufacturing simplicity through standardized modular design.
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 provides efficient operation with reduced loss and cost-effective designs, enabling scalable and flexible LED lighting solutions for general illumination applications by controlling current through the LED light source based on voltage levels.
Implementation Method 1
a reactive element, connected in series with said voltage input
Data Source
AI summary
An arrangement includes a voltage input, a reactive element connected in series with the voltage input, and an LED light source. The LED light source includes a first LED unit and a second LED unit, each having at least one LED, a controllable switching device to connect the LED units with the reactive element in a low voltage mode and a high voltage mode, and a control unit. The LED light source has a first, higher, forward voltage in the low voltage mode and a second, lower, forward voltage in the high voltage mode. The control unit controls the current through the LED light source by setting the switching device to the low voltage mode when the current, supplied to the LED light source, corresponds to a first threshold value, and by setting the switching device to the high voltage mode when the current corresponds to a second threshold value.