LED Driving System Voltage Adaptability Component Reduction
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Solution Overview
Problem
Traditional LED driving systems require multiple components and are costly due to the need for separate switching circuits to provide different voltages for LED strings with varying numbers of LEDs, making it difficult to reduce costs while efficiently powering multiple LED arrays.
Innovation Solution
A LED driving system with a simple structure that uses an energy storage component, power switches, and output switches to alternately supply different voltages to LED arrays, with a control circuit adjusting duty cycles based on the minimum voltages of LED strings to optimize voltage output, allowing for efficient power distribution with fewer components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two independent switching circuits are used to provide different voltages for LED strings with different numbers of LEDs, then the voltage requirements for different LED arrays are met, but the component count increases and cost increases
Solution Approach 1:
The patent merges two independent switching circuits into a single switching circuit that can provide multiple output voltages. The single circuit uses a series of switches (S1, S2, S3, S4) connected to taps on an inductor to generate different voltages for different LED arrays, reducing the overall component count while maintaining voltage adaptability for various LED configurations
Solution Approach 2:
The single switching circuit is designed to perform multiple functions by providing different output voltages to different LED arrays simultaneously. The circuit can supply voltage to first, second, third, and fourth LED arrays with different voltage requirements through controlled switching, making one circuit universal for multiple voltage supply needs
2Reliability
If traditional separate switching circuits are used for different LED arrays, then each LED array receives appropriate voltage, but the system cost increases due to more components
Solution Approach 1:
By combining multiple switching circuits into one integrated switching circuit with multiple output paths, the patent reduces component count and manufacturing complexity while maintaining reliable voltage supply to all LED arrays. The shared inductor and controlled switches provide reliable voltage distribution without requiring separate circuits for each LED array
3Productivity
If multiple independent switching circuits are used to drive different LED arrays, then each array gets dedicated voltage control, but the overall system efficiency decreases due to redundant components
Solution Approach 1:
The single switching circuit is designed to efficiently power multiple LED arrays simultaneously by using controlled switching to direct energy to different arrays as needed. The circuit can operate in different modes to supply power to various combinations of LED arrays, reducing energy loss from redundant components while maintaining high power distribution efficiency
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 system effectively provides different voltages to LED strings with a reduced component count, enhancing efficiency and cost-effectiveness by using energy storage and switch control to manage voltage distribution across multiple LED arrays.
Implementation Method 1
an energy storage component, having a first terminal and a second terminal, wherein the first terminal is coupled to the input terminal of the LED driving system to receive the input voltage
Data Source
AI summary
A LED driving system has an energy storage component receiving an input voltage, a power switch coupled between the energy storage component and a reference ground, a first output switch coupled between the energy storage component and a first output terminal, a second output switch coupled between the energy storage component and a second output terminal, and a control circuit, wherein the first output terminal produces a first output voltage to supply power for a first LED array, the second output terminal produces a second output voltage to supply power for a second LED array, the control circuit controls a duty cycle of the first output switch according to voltages at cathode terminals of multiple LED strings in the LED array and controls a duty cycle of the second output switch according to voltages at cathode terminals of multiple LED strings in the second LED array.