Centralized LED DC Power Supply with N+1 PWM Rectifiers
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Solution Overview
Problem
Conventional LED lamp systems face limitations due to integrated power supplies, resulting in larger size, higher costs, shorter service life, and difficulty in unified light adjustment, as each lamp requires an independent power supply and has a limited design flexibility.
Innovation Solution
A centralized DC power supply system utilizing N+1 three-phase PWM rectifier modules and a power supply management module to provide redundant power and adjustable voltage, allowing for external power supply management and unified control of LED clusters, reducing waste and enhancing maintenance convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each LED lamp integrates an independent power supply, then the lamp can operate independently, but the size and cost of the lamp increase
Solution Approach 1:
The power supply is extracted from the LED lamp and placed in a centralized external power supply system. This separation removes the bulky power supply component from the lamp structure, significantly reducing lamp size while maintaining independent operation capability through modular design where each lamp can still function independently when connected to the centralized system.
Solution Approach 2:
Multiple LED lamps share a common centralized power supply system instead of each having its own independent power supply. This merging of power supply functions into a single external system reduces the overall volume required per lamp while maintaining system reliability through redundant power distribution paths.
2Reliability
If each LED lamp integrates an independent power supply, then the lamp can operate independently, but the cost of the lamp increases
Solution Approach 1:
Multiple LED lamps share a common centralized power supply system instead of each having its own independent power supply. This merging reduces the total number of power supply units required, lowering overall system cost while maintaining operational independence through modular lamp designs that can be individually replaced or maintained.
Solution Approach 2:
The centralized power supply system serves multiple LED lamps simultaneously, making the power supply infrastructure universal rather than dedicated to each lamp. This multi-functionality reduces per-lamp cost while maintaining the ability to operate lamps independently when needed.
3Reliability
If each LED lamp integrates an independent power supply, then the lamp can operate independently, but the service life of the lamp decreases
Solution Approach 1:
The power supply is extracted from the LED lamp and placed in a centralized external system with enhanced protection and redundancy features. This separation allows the lamp itself to be designed for longer life without the power supply being a limiting factor, while the centralized system provides backup power capabilities to extend overall system service life.
Solution Approach 2:
The centralized power supply system incorporates redundancy and protection mechanisms in advance to prevent power-related failures that would otherwise limit lamp service life. By cushioning against power supply failures through external backup systems, the actual LED lamp components can operate at their full designed service life.
4Device complexity
If each LED lamp integrates an independent power supply, then the lamp structure is simple, but unified light adjustment of multiple LEDs is difficult
Solution Approach 1:
A centralized control system acts as an intermediary between the power supply and multiple LED lamps, enabling unified light adjustment. The control system manages power distribution and lighting parameters centrally while each lamp maintains its simple structure, resolving the conflict between structural simplicity and operational unity.
5Ease of manufacture
If a centralized DC power supply system is used, then cost is reduced and design flexibility is increased, but the system complexity increases
Solution Approach 1:
The centralized power supply system is divided into modular units with standardized interfaces, reducing system complexity while maintaining cost advantages. Each module can be independently managed and replaced, simplifying the overall complex system into manageable segments that are easier to design and maintain.
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 centralized system reduces costs, increases design flexibility, prolongs LED cluster service life, and enables efficient power management and energy conservation by providing reliable and adjustable power to LED street lamp systems.
Implementation Method 1
N+1 three-phase PWM rectifier modules, wherein each of N+1 three-phase PWM rectifier modules has a three-phase AC input end that is connected with said three-phase AC input interface
Data Source
AI summary
The invention provides a light emitting diode (LED) centralized DC (direct-current) power supply system and operating methods thereof. The proposed DC power supply system comprises a three-phase AC (alternating-current) input interface, a DC power supply output interface, N+1 three-phase PWM (pulse width modulation) rectifier modules, LED cluster loads and a power supply management module. The proposed operating methods are described as following: the power supply management module adjusts the duty ratio of the three-phase PWM rectifier modules, based on the control signals formed by synthesizing the information about voltage and current of the positive and negative output buses, the three-phase AC input ends, control signals and output of the three-phase PWM rectifier modules, hence AC voltage of power grid can be directly converted into adjustable DC voltage by the PWM rectifier.