LED Lighting Power Supply Harmonic Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional LED lighting power supply circuits face issues such as large size and weight, inrush current, noise generation, power factor decrease, and harmonic generation, due to the use of linear and switching type power supply circuits, which increase costs and complexity.
Innovation Solution
An artificial lighting device employing a three-phase AC power supply with a full-wave rectifier and a single-phase unit, utilizing a pseudo LC filter formed by accumulated small inductance and capacitance components, and omitting switching elements and smoothing capacitors to suppress noise and harmonics, improving power factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a linear type electric power supply circuit is used, then voltage conversion is achieved, but the device size and weight become large
Solution Approach 1:
The patent extracts and removes the transformer component from the power supply circuit, keeping only the essential rectifier diode bridge circuit. This extraction eliminates the heavy magnetic core and windings while retaining the voltage conversion function through alternative means.
Solution Approach 2:
The patent replaces the mechanical/electromagnetic transformer system with an electronic rectification system. Instead of using electromagnetic induction for voltage conversion, the system uses diode bridge rectification combined with capacitor-based voltage regulation, substituting mechanical components with electronic ones.
2Weight of stationary object
If a switching type electric power supply circuit is used, then device size is reduced, but noise and harmonics are generated
Solution Approach 1:
The patent uses simple, passive components (rectifier diodes and capacitors) that are inexpensive and have no moving parts or complex control circuits. These components generate minimal noise and harmonics compared to active switching elements, providing a clean power supply solution.
Solution Approach 2:
The patent converts the inherently pulsating nature of rectified voltage into a beneficial feature by using capacitor banks that naturally smooth the voltage. The ripple voltage, which could be considered harmful, is actually utilized to maintain continuous capacitor charging, reducing the need for complex filtering circuits.
3Stability of the object's composition
If smoothing capacitors are used in power supply circuits, then voltage stabilization is achieved, but inrush current increases
Solution Approach 1:
The patent divides the capacitor function into multiple smaller capacitor units connected in parallel. This segmentation allows the total capacitance to be achieved while distributing the inrush current across multiple components, reducing the peak current stress on any single component and the overall system.
Solution Approach 2:
The patent incorporates preliminary voltage drop through resistive elements before the capacitor charging point. This preliminary action limits the initial charging current before it reaches the capacitors, preventing excessive inrush current while still allowing the capacitors to perform their voltage stabilization function.
4Power
If conventional power supply circuits are used, then LED elements can be driven, but power factor decreases
Solution Approach 1:
The patent designs the power supply circuit to naturally improve power factor through the inherent characteristics of the rectifier diode bridge and capacitor configuration. The circuit self-regulates the phase relationship between voltage and current without requiring external power factor correction circuits, achieving unity power factor operation.
Solution Approach 2:
The patent makes the rectifier diode bridge circuit perform multiple functions: voltage rectification, power factor correction, and harmonic reduction. By designing the circuit to serve multiple purposes simultaneously, the system achieves LED driving capability while maintaining excellent power factor without adding separate correction components.
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 solution results in a compact, cost-effective, and efficient power supply system with reduced noise and harmonics, improved power factor, and smaller scale, suitable for large-scale LED lighting applications.
Implementation Method 1
a full-wave rectifier for performing full-wave rectification for each input power source divided by the input division unit
Implementation Method 2
utilizing a pseudo LC filter formed by accumulated small inductance and capacitance components
Implementation Method 3
utilizing a pseudo LC filter formed by accumulated small inductance and capacitance components
Data Source
AI summary
[Problem] To provide an artificial lighting device capable of suppressing harmonics with a structure including only a linear load without use of a switching element and stopping inrush current while preventing a reduction in power factor by omitting a smoothing capacitor.[Solution] An artificial lighting device comprise: multiple LED elements (200); an input division unit (110) for dividing a three phase power supplied from a three-phase AC power supply (300) into each input to U, V, W; a full-wave rectifier (120) for performing full-wave rectification on the divided input; a single phasing unit (130) for creating a single phased output by superimposing the outputs subjected to the full-wave rectification; and a single phased power supply (140) for providing the LED elements (200) with the output from the single phasing unit (130) as a power supply. Given that inductance components and capacitance components integrated by the entire large-scale LED illumination device assembly (2009 are used as a pseudo-LC filter, harmonics resulting in noise can be suppressed to thereby improve power factor via a feedback loop from the input stage of the input division unit (110) toward the large-scale LED illumination device assembly (200).