LED Driving Power Control Circuit with Ripple Elimination
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Solution Overview
Problem
Existing driving power control circuits for LEDs face challenges in maintaining consistent brightness across different LED strings and suffer from overheating due to power loss and ripple distortion in the power supply output.
Innovation Solution
A driving power control circuit with a control unit, switch units, and a voltage selecting module that adjusts current flow through each LED string based on feedback voltages, eliminating ripple and optimizing power distribution by selecting a reference node voltage and adjusting currents to maintain consistent brightness and reduce heat loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stable current circuit and compensation power supply circuit are set in the power driving circuits, then stable current and compensated voltage are provided to drive the LED strings, but ripple distortion problems exist in power supply output, resulting in overheating and instability of the whole power driving circuit
Solution Approach 1:
The patent divides the power driving circuit into multiple independent LED string driving circuits, each with its own current detection and control. This segmentation allows independent optimization of each string without affecting others, reducing overall ripple and heat accumulation while maintaining stable current delivery to each LED string.
Solution Approach 2:
The patent implements feedback control by detecting the current through each LED string and adjusting the driving voltage accordingly. The control circuit monitors the actual current flow and compensates for variations, providing stable current output while minimizing power loss and heat generation through precise feedback regulation.
2Productivity
If different LED strings are driven by power driving circuits, then LED strings can emit light, but different LED strings cannot be effectively maintained to have their brightness in consistency due to different load characteristics
Solution Approach 1:
The patent applies local quality control by providing individual current detection and control for each LED string based on its specific load characteristics. Each string receives customized driving parameters tailored to its unique characteristics, ensuring uniform brightness across all strings despite differences in their electrical properties.
Solution Approach 2:
The patent dynamically adjusts driving parameters (voltage, current) for each LED string based on real-time detection of their load characteristics. By changing operational parameters individually for each string, the system achieves consistent brightness output across all LED strings while maintaining efficient light emission.
Data Source
AI summary
A driving power control circuit and method for light emitting diodes (LEDs) are provided. The driving power control circuit includes a plurality of switch units and a control unit. Each switch unit is electrically coupled to one LED string whose end generates node voltage. The control unit includes a voltage selecting module, a subtractor, and an adjusting module. The voltage selecting module is electrically coupled to the node voltages and outputs one of the node voltages as a reference node voltage. The subtractor is electrically coupled to an output terminal of the voltage selecting module and generates a corresponding feedback voltage according to the reference node voltage and the node voltage. The adjusting module is electrically coupled to an output terminal of the subtractor and outputs a corresponding adjusting signal according to the feedback voltage to determine whether the corresponding switch unit is turned on.