Multi-Port Power Converter Layout for Balanced Input Power
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Solution Overview
Problem
Conventional power conversion systems face challenges in meeting multi-port requirements, achieving cost-effectiveness, and maintaining high efficiency due to issues with power balancing and power factor compliance, leading to increased power loss.
Innovation Solution
A power conversion system with N power converters, where each converter has two output terminals connected in parallel to form total output terminals, allowing for balanced power distribution and regulation of input powers to meet power factor requirements, thereby reducing power loss and enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single-port power conversion system with multiple power converters is used, then the system can process multiple power converters, but it cannot meet multi-port requirements and requires additional isolated transformers increasing cost
Solution Approach 1:
Each power converter is designed with dual output terminals that can independently connect to different ports, enabling a single power converter to serve multiple functions and ports simultaneously, thereby eliminating the need for additional isolated transformers and meeting multi-port requirements
2Ease of operation
If multiple power converters output powers independently in a multi-port system, then each converter can operate autonomously, but it is difficult to balance powers and achieve voltage-sharing purpose
Solution Approach 1:
The system implements feedback control by monitoring the output voltages and powers of each power converter, and automatically adjusting the operating parameters of each converter to maintain power balance and voltage sharing, ensuring stable operation while preserving autonomous operation capability
3Stability of the object's composition
If large amounts of reactive current are injected to balance voltage in a multi-port system, then voltage balance can be achieved, but power factor requirements cannot be met and efficiency is impaired
Solution Approach 1:
The system changes the operating parameters of each power converter dynamically, including switching frequencies, duty cycles, and phase angles, to achieve voltage balance and power factor correction without requiring large reactive current injection, thereby reducing power loss and improving efficiency
Data Source
AI summary
A power conversion system includes N power converters. Each power converter includes an input terminal, a first output terminal and a second output terminal. Each of the N power converters receives a DC power through the input terminal. The first output terminal of a first power converter and the second output terminal of an N-th power converter are connected in parallel to form an N-th total output terminal. The first output terminal of an i-th power converter and the second output terminal of an (i−1)-th power converter are connected in parallel to form an (i−1)-th total output terminal. The two input terminals of the load are connected with two total output terminals of N total output terminals. A (2k−1)-th power converter is connected with a first power source. A 2k-th power converter is connected with a second power source. The redundancy of the power conversion system can be achieved.