LED Strip Switch Mode Power Supply Voltage Sensitivity
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Solution Overview
Problem
Existing LED strips suffer from inefficient electronic circuits leading to heat development and are sensitive to variations in input voltage, limiting their application and efficiency.
Innovation Solution
The implementation of a switch mode power supply with parallel series arrangements of LED strings and resistors, where the common terminals of the resistors and LED strings are connected, along with a control circuit to regulate the switch mode power supply, ensuring consistent current through each LED string and reducing sensitivity to input voltage fluctuations, and the inclusion of controllable resistors for individual brightness and color control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional LED strip circuits are used, then the structure is simple and easy to manufacture, but the efficiency is low and heat is generated
Solution Approach 1:
The patent transforms the traditional voltage-driven LED circuit into a current-driven circuit by introducing a switch mode power supply. This parameter change from voltage control to current control fundamentally improves energy efficiency while the switch mode topology manages the complexity through controlled switching operations
Solution Approach 2:
The patent replaces the passive resistive current limiting method with an active switch mode power supply system. This substitution uses electronic switching and control circuits to achieve precise current regulation, dramatically reducing energy loss compared to traditional resistor-based methods
2Reliability
If traditional LED strip circuits are used, then the circuit is simple, but the light output is very sensitive for differences in input voltage
Solution Approach 1:
The switch mode power supply incorporates control circuits that monitor and regulate the current through each LED string. This feedback mechanism ensures stable light output despite variations in input voltage, as the control system continuously adjusts to maintain consistent current flow
Solution Approach 2:
The patent divides the LED strip into multiple independent LED strings, each with its own current regulation path through the switch mode power supply. This segmentation allows each string to be independently controlled, reducing sensitivity to overall input voltage variations
3Temperature
If switch mode power supply is implemented, then efficiency is improved and heat dissipation is minimized, but the device complexity increases
Solution Approach 1:
The switch mode power supply operates by periodic switching of electronic components, converting energy efficiently through controlled on-off cycles. This periodic operation allows the system to achieve high efficiency and minimal heat dissipation by minimizing energy loss during transitions and maintaining components in optimal states during each cycle
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 configuration enhances the efficiency of the LED light source by minimizing heat dissipation and voltage sensitivity, allowing for consistent light output and improved control over brightness and color, making it suitable for use with sensors and scalable lighting solutions.
Implementation Method 1
a switch mode power supply comprising output terminals coupled to the input terminals of the first LED strip, a switch, a unidirectional element, an inductive element
Implementation Method 2
each series arrangement comprises a LED string
Data Source
Figure 1~3
Figure 4A~5
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AI summary
A LED light source comprising a LED strip supplied by a switch mode power supply is disclosed. The LED light source has a low power dissipation and is to a large extent independent of the magnitude of the DC voltage supplying the switch mode power supply. The LED light source allows arbitrary positioning of a light or a presence detector.