LED Lighting Apparatus Current Control Circuit Power Factor
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Solution Overview
Problem
LED lighting apparatuses face challenges in maintaining uniform illumination and power factor efficiency, especially in unstable power supply environments, due to the need for additional circuits and sensitivity to AC voltage fluctuations.
Innovation Solution
An LED lighting apparatus with a current control circuit that divides rectified voltage into periods to control light-emitting diodes (LEDs) based on current detection voltage, using switching circuits and reference voltages to manage current paths and compensate for power variations, thereby ensuring consistent illumination and improved power factor without requiring inductors or capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional circuits are used to drive LED with constant current, then LED can be driven properly, but device complexity increases
Solution Approach 1:
The patent extracts and removes the inductor component from the LED driving circuit, using only capacitive elements for power factor correction and current control. This simplifies the circuit structure while maintaining the ability to drive LEDs with constant current, directly resolving the contradiction between reliability and device complexity.
2Loss of energy
If inductor and capacitor are used for power factor correction, then power factor improves, but device complexity and cost increase
Solution Approach 1:
The patent removes the inductor from the power factor correction circuit, using only capacitive elements (first capacitor and second capacitor) to achieve power factor correction. This reduces component complexity and cost while maintaining improved power factor characteristics.
Solution Approach 2:
The capacitor in the circuit serves multiple functions simultaneously: power factor correction, voltage smoothing, and current control for the LED channels. This multi-functionality reduces the need for separate components, simplifying the overall circuit while maintaining energy efficiency.
3Adaptability or versatility
If AC voltage varies in unstable power supply environment, then adaptability improves, but illumination uniformity deteriorates
Solution Approach 1:
The patent employs a control circuit that detects the rectified voltage level and adjusts the current to each LED channel accordingly. The control circuit uses feedback from the voltage detection to maintain constant current levels across varying AC voltage conditions, ensuring uniform illumination while adapting to different power supply environments.
Solution Approach 2:
The patent divides the LED lighting system into multiple independent channels, each with its own current control circuit. This segmentation allows each channel to be independently regulated, maintaining uniform illumination across all LEDs even when AC voltage varies, as each channel receives appropriately controlled current.
4Device complexity
If multiple LED channels are connected in series, then circuit structure simplifies, but current regulation difficulty increases
Solution Approach 1:
The patent segments the current control for series-connected LED channels by providing separate control circuits for each channel. Although the LEDs are connected in series, each channel has its own current control switch and detection circuit, enabling precise independent regulation of current for each LED group while maintaining the simplified series connection structure.
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 enables uniform illumination and enhanced power factor regulation across varying power supply conditions, simplifying the circuit structure and improving heat radiating efficiency while maintaining constant current levels for each LED channel.
Implementation Method 1
a power supply unit configured to convert an AC voltage and provide a rectified voltage
Implementation Method 2
N current detection resistors configured to be independently connected to the N switching circuits and a ground to provide a current detection voltage
Data Source
AI summary
Disclosed is a light emitting diode lighting apparatus capable of improving a power factor and temperature characteristics. The light emitting diode lighting apparatus according to a preferred embodiment of the present invention includes a light source having a plurality of light emitting diode channels and performs a current regulating operation to allow a light source to emit light. The light source uses a current path provided by current regulating to emit light.