AC Direct Driving LED Modules with Modular Connection
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Solution Overview
Problem
Light emitting devices using LEDs face complications and reduced lifespan due to the need for rectifying circuits for direct current (DC) power, which can complicate configurations and lead to mechanical issues.
Innovation Solution
A light emitting device employing an alternating current (AC) direct driving scheme using DC power in the form of a sine wave, with a driving module that controls the number of light source groups based on power levels and connects them in series or parallel through a module connection unit, allowing for adjustable luminous flux without a constant current circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rectifying circuit is used to convert AC power to DC power for LED operation, then the LED can be driven with stable current, but the device configuration becomes complicated and lifespan decreases
Solution Approach 1:
The patent removes the rectifying circuit from the LED driving system by directly connecting the LED to the AC power source through a current-limiting resistor. This extraction of the problematic component eliminates the complexity and reliability issues associated with rectifying circuits while maintaining functional operation of the LED.
Solution Approach 2:
The patent uses a simple current-limiting resistor instead of a complex rectifying circuit with multiple components. This substitution with a simpler, more reliable component achieves the same current control function without the lifespan and complexity problems of traditional rectifying circuits.
2Use of energy by moving object
If multiple light source groups are connected in series to increase voltage utilization, then power efficiency improves, but the control flexibility for adjusting luminous flux decreases
Solution Approach 1:
The patent divides the lighting system into multiple independently controllable light source groups (first light source group, second light source group, etc.). Each group can be controlled separately through individual switching elements, allowing flexible adjustment of luminous flux while maintaining series connection for efficient power utilization.
Solution Approach 2:
The patent implements dynamic control of light source groups by introducing switching elements that can selectively connect or disconnect each group based on power levels. This dynamic configuration allows the system to adapt between different operating modes (full power, partial power, dimming) while maintaining series connection benefits.
3Reliability
If light emitting modules are permanently fixed together to ensure stable electrical connection, then connection reliability improves, but the ability to adjust luminous flux and ease of repair deteriorates
Solution Approach 1:
The patent divides the lighting system into separate light emitting modules (first module, second module, etc.) that can be independently connected or disconnected. Each module contains complete functional elements (light sources, current-limiting resistors, switching elements), allowing individual replacement or adjustment without affecting other modules.
Solution Approach 2:
The patent pre-configures each light emitting module with all necessary components (light sources, current-limiting resistors, switching elements) in a standardized format. This preliminary preparation allows modules to be easily connected in series or parallel configurations and simplified replacement during maintenance without requiring complex reconfiguration.
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
The AC direct driving scheme enables flexible and efficient control of light output, increasing luminous flux proportionally with the number of connected light emitting modules, while simplifying the device configuration and potentially extending lifespan by eliminating the need for complex rectifying circuits.
Implementation Method 1
a rectifying unit rectifying externally applied AC power
Data Source
AI summary
A light emitting device includes: a plurality of light emitting modules each provided with a circuit board, and first to n-th light source groups disposed on the circuit board, n being an integer greater than two, wherein the first to n-th light source groups each include at least one light emitting diode (LED); a driving module supplying driving power to the plurality of light emitting modules, and determine a number of light source groups operating in each of the plurality of light emitting modules based on a level of the driving power; and a module connection unit connecting first to n-th light source groups provided in one of the plurality of light emitting modules and first to n-th light source groups provided in another light emitting module in parallel in a detachable manner, respectively.