AC LED Lighting System with Bypass Switches and Capacitors
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Solution Overview
Problem
Conventional LED lighting systems driven by alternating current (AC) power experience inefficiencies due to flickering and failure to turn on during voltage drops, as they emit light only during specific periods and may not function consistently under varying AC supply conditions.
Innovation Solution
The proposed lighting system divides light emitters into segments connected in series, using electronic bypass switches and isolation diodes with capacitors to ensure continuous light emission by self-sensing voltage thresholds and bypassing current around light emitters, allowing capacitors to supply current and maintain constant intensity even during voltage fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If LED's are connected in series and driven directly by rectified AC supply voltage, then the system is simple and efficient, but light emission is intermittent and flickers at twice the AC frequency
Solution Approach 1:
The patent divides the series-connected LED string into multiple segments, with each segment having its own bypass switch. This segmentation allows different portions of the LED string to be activated at different voltage levels during the AC cycle, enabling continuous light emission while maintaining system simplicity.
Solution Approach 2:
The bypass switches are configured to activate in advance before the main LED string requires full voltage. By pre-charging capacitors and activating bypass paths at lower voltage thresholds, the system ensures continuous illumination without waiting for peak AC voltage, eliminating flicker while keeping the circuit simple.
2Use of energy by moving object
If the supply voltage peak drops during brown-out or dimming, then energy efficiency is maintained, but the lighting system fails to turn on
Solution Approach 1:
The patent employs dynamic bypass switching that adapts to varying supply voltage conditions. The bypass switches are controlled to activate at different voltage thresholds, allowing the system to operate reliably across a wide voltage range. During brown-outs, the bypass switches ensure continuous operation by providing alternative current paths, while maintaining energy efficiency through intelligent switch control.
Solution Approach 2:
Capacitors are introduced as intermediary energy storage elements that bridge the gap during voltage drops. These capacitors charge during normal operation and discharge during brown-outs or dimming events, ensuring continuous LED operation without sacrificing overall energy efficiency. The bypass switches act as intermediaries that route current through capacitors when main voltage is insufficient.
3Duration of action of moving object
If electronic drivers with bypass switches are used for each LED, then continuous light emission is achieved, but device complexity increases significantly
Solution Approach 1:
The patent merges multiple bypass switches into a single integrated control structure that manages segments of the LED string. Rather than requiring independent driver circuits for each LED, the bypass switches are coordinated to work together as a unified system, reducing overall complexity while maintaining continuous illumination through segment-by-segment activation.
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 system achieves continuous and consistent light emission with minimal intensity variation, maintaining functionality during brown-outs and dimming conditions, reducing transient currents and heat loss, and improving overall efficiency.
Implementation Method 1
a capacitor (C1, C2, C3) connected in parallel with the light emitter(s) within the segment
Implementation Method 2
an isolation diode (304, 312, 318) connected in series with the light emitter(s) within the segment
Implementation Method 3
Light Emitting Diodes (LED's)
Data Source
AI summary
A lighting system includes a switch configured so that when the switch is in a first state, current from a supply flows to a light emitter, and when the switch is in a second state, current from the supply flows through the switch bypassing the light emitter. A capacitor in parallel with the light emitter provides current to the light emitter sufficient to cause the light emitter to emit light when the switch is in the second state.