Multi-junction Solid State Transducer for AC Power
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Solution Overview
Problem
Conventional AC-driven LED devices have low efficiency and are infeasible for applications with tight space constraints, as they require multiple LED dies to achieve the same lumen density, making them unsuitable for spot lighting and other applications where a single LED die is necessary.
Innovation Solution
The development of multi-junction SST devices with independently drivable chains, each comprising multiple P-N junctions, allowing for selective activation based on input voltage, enabling efficient power utilization and reduced overall emissions area by utilizing varying levels of available AC power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If multiple LED dies are coupled in series for AC power operation, then power utilization is improved, but device area increases
Solution Approach 1:
The patent divides the LED structure into multiple independent chains, where each chain contains multiple LED dies coupled in series. These chains are connected in parallel between the first and second contacts. This segmentation allows selective activation of individual chains based on available AC voltage levels, enabling efficient power utilization while maintaining a compact overall device area by sharing common contacts and substrate space.
2Area of stationary object
If a single LED die is used, then device area is reduced, but lumen density is insufficient
Solution Approach 1:
The patent merges multiple LED dies into integrated chains that are coupled in series within each chain and connected in parallel between common contacts. This merging approach allows multiple light-emitting elements to be combined into a compact structure that achieves high lumen density while maintaining a small overall device area, as the shared contacts and substrate space eliminate the need for separate mounting areas for each LED die.
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 solution allows for more efficient power use and higher luminous flux from a smaller area, making it suitable for applications with space constraints while maintaining high output, unlike conventional AC systems that only activate when voltage is sufficient for all LEDs.
Implementation Method 1
Multi-junction solid state transducer devices for direct AC power and associated systems and methods
Data Source
AI summary
Multi-junction solid-state transducer (SST) devices and associated systems and methods are disclosed herein. In several embodiments, for example, an SST system can include a first multi-junction SST chain having a first drive voltage, a first P-contact, and a first N-contact, and a second multi-junction SST chain having a second drive voltage, a second P-contact, and a second N-contact. The first and second multi-junction SST chains can be configured to be activated independently of each other. The SST system can further include a driver operably coupled to the first and second P- and N-contacts. The driver can be configured to activate the first multi-junction SST chain when voltage input is at least equal to the first drive voltage. When absolute voltage increases a predetermined voltage level, the driver can be configured to activate the second multi-junction SST chain or the first and second multi-junction SST chains.