Dual Closed-Loop LED Driver Power Supply for Flicker and Harmonics
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Solution Overview
Problem
Existing lighting device driving power supplies face challenges in achieving flicker-free performance, high power factor, and efficiency while minimizing harmonic distortion and cost, particularly under wide voltage applications.
Innovation Solution
A lighting device driving power supply with a dual closed-loop mechanism, comprising a rectification module, first and second energy storage modules, and a switch module, which forms closed loops to maintain a high power factor and prevent voltage surges, thereby preventing flicker and harmonic currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If low power factor driving power supplies are used to achieve flicker-free requirements, then flicker-free performance is improved, but harmonic distortion increases and power grid pollution occurs
Solution Approach 1:
The power supply circuit is segmented into two independent closed loops: a first closed loop containing the rectification module and first energy storage module for power factor correction, and a second closed loop containing the second energy storage module and light source for stable lighting output. This segmentation allows each loop to independently optimize its function, achieving both flicker-free performance and low harmonic distortion
Solution Approach 2:
The first energy storage module acts as an intermediary between the rectification module and the power grid, storing energy during the rectification process and releasing it to maintain continuous current flow. This intermediary energy storage mechanism smooths out current fluctuations and reduces harmonic distortion while maintaining flicker-free operation
2Reliability
If driving power supplies with power factor correction circuits and DC/DC conversion circuits are used, then high power factor and anti-flicker function are achieved, but device cost increases
Solution Approach 1:
The patent merges the power factor correction function and the anti-flicker function into a single dual closed-loop circuit structure. The first closed loop handles power factor correction while the second closed loop ensures stable light output, combining multiple functions into one integrated design that reduces component count and manufacturing cost
Solution Approach 2:
The energy storage modules serve multiple functions: the first energy storage module performs power factor correction and harmonic reduction, while the second energy storage module provides stable voltage to the light source for flicker-free operation. This multi-functionality eliminates the need for separate circuits for each function, reducing overall device cost
3Reliability
If driving power supplies with valley-fill circuits are used, then anti-flicker performance is improved, but power factor fails to meet requirements under wide voltage applications
Solution Approach 1:
The patent employs dynamic energy management where the energy storage modules automatically adjust their charging and discharging rates based on input voltage conditions. Under wide voltage applications, the first energy storage module dynamically compensates for voltage variations to maintain high power factor, while the second energy storage module ensures continuous stable output to prevent flicker
Solution Approach 2:
The circuit parameters of the energy storage modules are optimized to change with input voltage conditions. The inductance and capacitance values are selected to provide optimal power factor correction and anti-flicker performance across a wide voltage range, allowing the system to adapt to different operating conditions while maintaining both high power factor and flicker-free operation
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 dual closed-loop mechanism ensures high power factor, prevents flicker and harmonic currents, and meets wide voltage input requirements, all while reducing costs through a simple circuit design.
Implementation Method 1
When the switch module is turned off, the first energy storage module and the second energy storage module form a first closed loop... the first energy storage module discharges to generate a first current, and the first current charges the second energy storage module
Implementation Method 2
the third energy storage module and the light source form a second closed loop... the third energy storage module discharges to generate a second current, and the second current passes through the light source
Implementation Method 3
the light source is a light-emitting diode (LED) or a LED array
Data Source
AI summary
A lighting device driving power supply includes: a rectification module connected to a power grid; a first energy storage module connected to the rectification module; a second energy storage module connected to the rectification module, the first energy storage module, and a light source; a switch module connected to the rectification module, the first energy storage module, and the second energy storage module; a third energy storage module is connected to the first energy storage module, the second energy storage module, the switch module, and the light source. When the switch module is turned on, the rectification module charges the first, second, and third energy storage modules. When the switch module is turned off, the first energy storage module and the second energy storage module form a first closed loop, while the third energy storage module and the light source form a second closed loop.