Adaptive LED Driver Circuitry for Voltage Drop Compensation
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Solution Overview
Problem
Existing electronic circuits driving series-connected LEDs face challenges in maintaining consistent voltage and current due to variations in forward voltage drop across individual LEDs, leading to inefficiencies and potential dimming or shutdown when voltage drops below a certain threshold.
Innovation Solution
A circuit configuration that includes a switching regulator, a current regulator, and an adaptive response circuit with a non-linear amplifier and adaptive regulation voltage circuit, which provides a non-linear control signal and adjusts voltage to maintain operation, ensuring faster response to voltage drops and maintaining current supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common switching regulator supplies voltage to multiple series-connected LED strings, then all LED strings can be powered by a single regulator, but the regulator must output a high enough voltage to supply the LED string with the greatest total voltage drop plus overhead voltage for current sink operation
Solution Approach 1:
The patent divides the LED driver system into separate independent channels, with each LED string having its own dedicated switching regulator and current sink. This segmentation allows each regulator to be optimized for its specific LED string's voltage requirements, rather than one regulator having to accommodate the maximum voltage of all strings. The segmentation resolves the contradiction by trading increased device count for reduced power requirements per device.
2Reliability
If the switching regulator outputs high enough voltage to accommodate LED strings with greatest voltage drop variations, then all LED strings can operate reliably, but voltage and current consistency becomes difficult to maintain across strings with different forward voltage drops
Solution Approach 1:
The patent applies local quality by providing each LED string with its own dedicated switching regulator and current sink, allowing each channel to be independently optimized for its specific LED string's forward voltage characteristics. This localized approach ensures that each string receives precisely the voltage and current it needs, maintaining stability for each individual string while accommodating variations across different strings through independent regulation channels.
3Adaptability or versatility
If individual LEDs have variation in forward voltage drop, then manufacturing tolerances are accommodated, but the total forward voltage drop of series-connected LED strings varies significantly
Solution Approach 1:
The patent segments the LED driver architecture so that each LED string is independently regulated by its own switching regulator and current sink. This segmentation allows the system to accommodate manufacturing variations in individual LEDs and entire LED strings without requiring tight control over total forward voltage drop. Each independent channel adapts to its specific string's characteristics, resolving the contradiction between tolerating manufacturing variations and maintaining precision in total voltage drop.
Data Source
AI summary
In one aspect, a circuit includes a switching regulator configured to provide power to a load, a current regulator circuit coupled to the load and a response circuit configured to provide a control signal to the switching regulator in response to electrical changes of the current regulator circuit. The control signal changes non-linearly with respect to the electrical changes at the current regulator circuit. In another aspect, a circuit includes an adaptive regulation voltage circuit configured to provide a regulation voltage to a first input of an amplifier to maintain operability of a current regulator circuit. The adaptive regulation voltage circuit replicates electrical characteristics of the current regulator circuit.