LED Device Shared Voltage-Limiting Unit Equalizing Resistance
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Solution Overview
Problem
Conventional LED devices with parallel-connected voltage-limiting units, such as zener diodes, fail to evenly distribute voltage when series-connected, leading to uneven current distribution and potential damage to LEDs under abnormal high voltage conditions.
Innovation Solution
The implementation of a shared voltage-limiting unit and individual voltage-equalizing resistance for each LED set, where two ends of a series-connected LED set are parallel-connected with a shared voltage-limiting unit and each LED is further parallel-connected with a voltage-equalizing resistance, effectively absorbing surge voltage and protecting LEDs from overvoltage or overcurrent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If parallel-connected voltage-limiting units (e.g., zener diodes) are used with LEDs, then overvoltage protection is provided, but voltage distribution becomes uneven when series-connected, leading to unequal current distribution and potential LED damage
Solution Approach 1:
The patent divides the voltage-limiting function into two segments: a shared voltage-limiting unit connected to the LED set and individual voltage-equalizing resistors connected to each LED. This segmentation allows the shared unit to handle surge voltage while the individual resistors ensure uniform voltage distribution, resolving the contradiction between overvoltage protection and voltage distribution uniformity.
Solution Approach 2:
The voltage-equalizing resistors act as intermediary elements between the shared voltage-limiting unit and each LED. These resistors mediate the voltage distribution by ensuring that even though the shared unit provides protection, each LED receives equal voltage share, preventing current imbalance and LED damage.
2Manufacturing precision
If individual voltage-equalizing resistors are added to each LED, then voltage distribution uniformity is improved, but device complexity increases
Solution Approach 1:
The patent merges the voltage-limiting function into a single shared unit rather than having separate units for each LED. This combining approach reduces the total number of components while still providing effective overvoltage protection, thereby reducing device complexity while maintaining voltage distribution uniformity through the added equalizing resistors.
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
This configuration ensures even voltage distribution across LEDs, preventing damage from surge voltages and providing effective overvoltage protection, thereby enhancing the reliability and longevity of the LED device.
Implementation Method 1
two ends of a LED set constituted by a plurality of same-polarity series LEDs are in parallel connected with a shared voltage-limiting unit... when surge voltage from a power source is generated, the surge voltage can be absorbed by the shared voltage-limiting unit
Implementation Method 2
two ends of individual LED are respectively in parallel connected with an voltage-equalizing resistance for providing an overvoltage protection to the LEDs
Data Source
AI summary
The present invention relates to a LED device with shared voltage-limiting unit and individual voltage-equalizing resistance, wherein two ends of a LED set constituted by a plurality of same-polarity series LEDs are in parallel connected with a shared voltage-limiting unit, and two ends of individual LED are respectively in parallel connected with an voltage-equalizing resistance for providing an overvoltage protection to the LEDs.