LED Driver Segmentation for AC Voltage Adaptation
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Solution Overview
Problem
Existing LED drivers for AC lighting systems are inefficient, costly, and unsuitable for direct replacement of incandescent bulbs due to low efficiency, high component count, and inability to handle varying AC input voltages, leading to reduced LED utilization and increased energy costs.
Innovation Solution
A system that adapts to a wide AC input voltage range by dynamically switching segments of LEDs in and out of the current path based on monitored parameters, such as current levels, to maintain constant output and implement power factor correction, reducing component count and size while enhancing efficiency and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LED drivers use high brightness LEDs requiring large currents, then light output is achieved, but system efficiency is reduced and energy costs increase
Solution Approach 1:
The LED array is divided into multiple segments that can be independently controlled. By switching segments in and out of the current path based on monitored parameters, the system maintains constant output current while distributing the load, thereby achieving high brightness without requiring excessively large currents that would reduce efficiency
Solution Approach 2:
The system dynamically adjusts which LED segments are active based on real-time monitoring of current levels and AC input voltage. This dynamic switching allows the system to maintain optimal operating conditions for efficiency while still achieving the required light output levels
2Loss of energy
If LED drivers are designed with high conversion ratios of input to output voltages, then energy savings are achieved, but the drivers become unsuitable for direct replacement of incandescent bulbs in AC sockets
Solution Approach 1:
The LED driver is designed to directly interface with standard AC sockets while incorporating power factor correction and wide voltage range handling. This multi-functionality allows the same device to achieve high energy efficiency through voltage conversion while simultaneously maintaining universal compatibility with existing AC lighting infrastructure
Solution Approach 2:
The system handles wide variations in AC input voltage parameters through power factor correction and dynamic switching control. By adapting to parameter changes in the AC supply, the driver maintains efficient operation across different voltage conditions while remaining compatible with standard AC sockets
3Device complexity
If component count is reduced by constructing converters without isolation transformers, then cost and complexity are reduced, but converter size increases due to lower operating frequency
Solution Approach 1:
The converter uses multiple LED segments with individual switching control, allowing the system to operate at higher effective frequencies through rapid switching of smaller segments. This segmentation approach eliminates the need for large isolation transformers while maintaining compact size through higher frequency operation
4Adaptability or versatility
If AC input voltage varies, then adaptability to different power sources is improved, but LED utilization is reduced and output stability deteriorates
Solution Approach 1:
The system continuously monitors current levels and AC input voltage, using this feedback to dynamically adjust which LED segments are active. This feedback control maintains constant output current despite variations in AC input voltage, ensuring stable LED utilization and consistent light output across different power source conditions
5Adaptability or versatility
If complex control methods are used to handle varying AC voltages, then voltage stability is improved, but device complexity and cost increase
Solution Approach 1:
The control system manages voltage variations through simple switching of segmented LED arrays rather than complex continuous regulation. Each segment can be independently switched on or off based on voltage conditions, providing effective voltage regulation through discrete, simple control actions rather than complex continuous control circuits
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 high LED utilization, reduced energy costs, and improved reliability by maintaining constant output across varying AC voltages, enabling efficient power delivery to LEDs while minimizing internal stress on components.
Implementation Method 1
a plurality of light emitting diodes (LEDs) coupled in series to form a plurality of segments of light emitting diodes
Data Source
AI summary
An apparatus, method and system are disclosed for providing AC line power to lighting devices such as light emitting diodes (“LEDs”). A representative apparatus comprises: a plurality of LEDs coupled in series to form a plurality of segments of LEDs; first and second current regulators; a current sensor; and a controller to monitor a current level through a series LED current path, and to provide for first or second segments of LEDs to be in or out of the series LED current path at different current levels. A voltage regulator is also utilized to provide a voltage during a zero-crossing interval of the AC voltage. In a representative embodiment, first and second segments of LEDs are both in the series LED current path regulated at a lower current level compared to when only the first segment of LEDs is in the series LED current path.