Constant Current Regulator Circuit for LED Voltage Balancing
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Solution Overview
Problem
LED lighting systems with multiple LED strings coupled in parallel face voltage imbalances due to differing turn-on voltages and maximum drive current ratings, particularly between blue and red LEDs, leading to inefficient power distribution and potential overvoltage issues.
Innovation Solution
Incorporating a constant current regulator circuit in series with one or more LED strings to provide a balanced current, allowing for voltage balancing and efficient current distribution across parallel LED strings, with the option of using tunable constant current regulators to adjust current ratios based on variable reference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple LED strings with different turn-on voltages are coupled in parallel to accommodate higher powered driver circuits, then the power handling capability is improved, but voltage imbalance occurs between the LED strings
Solution Approach 1:
The patent applies local quality by providing individual constant current regulator circuits to specific LED strings that require current control. Each regulator circuit is selectively coupled to particular LED strings based on their unique voltage and current requirements, allowing localized optimization without affecting other strings. This resolves the voltage imbalance problem while maintaining the parallel configuration for high power handling.
Solution Approach 2:
The patent utilizes parameter changes by employing constant current regulator circuits that dynamically adjust and maintain a predetermined current level across LED strings with different forward voltages. The regulator circuits change the current parameter to compensate for voltage differences, ensuring balanced operation of parallel LED strings with varying electrical characteristics.
2Stability of the object's composition
If constant current regulator circuits are added to balance current distribution among LED strings, then current balance is improved, but circuit complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the LED lighting system into independent controllable units. Each LED string or substring is equipped with its own constant current regulator circuit, allowing independent control and optimization. This modular approach enables precise current balancing while keeping each regulator circuit relatively simple and manageable.
Solution Approach 2:
The patent employs universal constant current regulator circuits that can be applied to multiple different LED string configurations. The regulator circuits are designed to handle various forward voltage requirements and can be selectively coupled to different strings, providing a versatile solution that reduces overall system complexity through standardized components.
Data Source
AI summary
Systems and methods for balancing voltage in LED circuits are provided. An LED circuit can have a plurality of LED strings coupled in parallel with one another. Each LED string can include a plurality of LED devices coupled in series. The LED strings can receive a driver current from a driver circuit. According to example embodiments of the present disclosure, at least one of the plurality of LED strings can include a constant current regulator circuit coupled in series with the LED string. The constant current regulator circuit can provide a constant current through the LED string. The balance or remainder of the driver current can be provided to the other LED string. The constant current regulator circuit can provide for voltage balancing among the plurality of parallel LED strings.