LED Matrix with Rectifier Cavities for AC Compatibility
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Solution Overview
Problem
Conventional AC LEDs have limited withstand voltage and payload when used with commercial power, leading to reduced reliability and illumination efficiency due to reverse bias voltage and partial lighting issues.
Innovation Solution
The light emitting device employs a configuration where LEDs are selectively connected in series or parallel, with rectifier diodes evenly arranged in cavities on a substrate, allowing for efficient rectification of AC power to DC power, enhancing voltage withstand and payload through a matrix arrangement of LED modules and conductive wire layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If bridge rectifying architecture is used to enable AC power supply operation, then AC compatibility is achieved, but LED reliability deteriorates due to excessive reverse bias voltage causing leakage current and breakdown
Solution Approach 1:
The invention divides the LED array into multiple independent LED groups, with each group having its own current control circuit. This segmentation allows independent control of each group, enabling selective operation during AC power cycles and preventing excessive reverse bias voltage from damaging all LEDs simultaneously, thus maintaining reliability while achieving AC compatibility
2Adaptability or versatility
If bridge rectifying architecture is used to enable AC power supply operation, then AC compatibility is achieved, but illumination efficiency deteriorates because only 1/2 LED can be lighted up simultaneously
Solution Approach 1:
The invention employs dynamic control of multiple LED groups through separate current control circuits, allowing the system to adaptively switch between different LED groups during AC power cycles. This dynamic operation enables all LEDs to be utilized throughout the complete AC cycle rather than limiting operation to half the LEDs, thereby achieving both AC compatibility and high illumination efficiency
3Strength
If LEDs are connected in series to increase voltage withstand, then voltage tolerance improves, but payload is reduced due to current limitations
Solution Approach 1:
The invention segments the LED array into multiple parallel-connected LED groups, where each group can be configured in series to achieve required voltage withstand. The parallel connection of multiple groups maintains high payload capability by providing multiple current paths. This segmented architecture allows flexible configuration to simultaneously achieve both high voltage tolerance and high payload
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 improves the voltage withstand and payload of the light emitting device, enabling it to handle high-voltage inputs effectively and maintain reliable illumination, reducing the risk of LED breakdown and increasing overall efficiency.
Implementation Method 1
The rectifier diodes comprise a first rectifier diode, a second rectifier diode, a third rectifier diode, and a fourth rectifier diode. The first rectifier diode is connected to the second rectifier diode in series. The third rectifier diode is connected to the fourth rectifier diode in series. The AC power supply received at the first AC node and the second AC node is rectified as a direct current (DC) power supply by the rectifier diodes
Data Source
Figure 1A
Figure 1B~1C
Figure 2A
AI summary
A light emitting device includes a substrate, a plurality of rectifier diodes, and at least one light emitting diode (LED) module. The substrate has a first cavity, a second cavity, and a third cavity formed thereon. The rectifier diodes are arranged in the first cavity and the third cavity respectively. The LED module is arranged in the second cavity. The LED module includes a plurality of LEDs. The light emitting device is capable of rectifying and converting an alternating current (AC) power supply to drive the LEDs to emit light.