Dynamic Current Equalization for LED String Reliability
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Solution Overview
Problem
Conventional LED systems face issues where individual LED strings can fail, disrupting current flow and reducing light output, necessitating maintenance and incurring costs.
Innovation Solution
Implementing a dynamic current equalization system that adjusts currents in remaining LED strings to maintain light output, using a current control unit with dynamic current equalizers that can distribute currents equally or apply scaling factors, allowing the system to function even when one or more strings fail.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional LED systems are used without current equalization, then the system structure remains simple, but the reliability drops when individual LED strings fail
Solution Approach 1:
The patent implements a feedback mechanism where the current control unit continuously monitors the current through each LED string and dynamically adjusts the current distribution. When an LED string fails or its current deviates from the target, the system detects this condition and redistributes current to maintain overall light output, thereby improving reliability through active monitoring and adjustment.
Solution Approach 2:
The system transitions from static current distribution to dynamic current equalization. The current control unit continuously adjusts current allocation based on real-time conditions, allowing the system to adapt when LED strings fail or their characteristics change, thus maintaining reliability without requiring a completely redesigned system architecture.
2Illumination intensity
If dynamic current equalization is implemented, then the light output is maintained when LED strings fail, but the device complexity increases
Solution Approach 1:
The current control unit performs multiple functions: it regulates total current from the power supply, distributes current to individual LED strings, monitors current through each string, detects failures, and dynamically redistributes current. This multi-functionality is achieved within a single integrated control unit, avoiding the need for separate components for each function and thereby limiting the increase in device complexity.
Solution Approach 2:
The patent combines current regulation, current distribution, monitoring, and failure detection functions into a single current control unit. By merging these functions rather than implementing them as separate independent systems, the patent reduces the overall complexity increase while still maintaining light output through dynamic current equalization.
3Ease of repair
If current equalization is implemented to maintain light output, then the maintenance needs are reduced, but the manufacturing complexity increases
Solution Approach 1:
The system implements self-service by automatically detecting when LED strings fail and dynamically redistributing current to maintain light output without human intervention. This extends the operational life of the LED panel and delays the need for maintenance, as the system compensates for failures autonomously rather than requiring manual monitoring or immediate repair.
Solution Approach 2:
The system changes operational parameters dynamically by adjusting current distribution based on real-time conditions. When LED strings fail or their characteristics drift, the current control unit modifies current allocation to maintain overall performance, thereby extending maintenance intervals without requiring complex manufacturing processes.
4Object-generated harmful factors
If dynamic current equalizers are used instead of switching elements, then electromagnetic interference is minimized, but the control complexity increases
Solution Approach 1:
The patent replaces switching elements (which generate electromagnetic interference) with dynamic current equalizers that use continuous analog or digital control. This substitution eliminates the rapid switching actions that cause EMI while achieving the same current distribution function through smoother control mechanisms, accepting increased control complexity as a trade-off for reduced electromagnetic interference.
Data Source
AI summary
A system includes multiple dynamic current equalizers (DCEs). Each DCE includes a first control loop configured to regulate a current through a circuit branch associated with the dynamic current equalizer. The first control loop includes a first amplifier having two inputs. Each DCE also includes a second control loop configured to regulate a control signal. The second control loop includes a second amplifier having two inputs coupled to the inputs of the first amplifier. The first amplifier has an input offset compared to the second amplifier. The DCEs are configured such that one DCE regulates the control signal while one or more other DCEs regulate the currents through the associated circuit branches based on the control signal. The DCEs can be configured to achieve one or more ratios between multiple currents flowing through multiple circuit branches, where the one or more ratios are defined by resistances coupled to the DCEs.