Bidirectional Power Converter Control With Single High-Frequency Stage
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Solution Overview
Problem
Existing bidirectional power conversion devices require both conversion circuits to perform high-frequency switching operations, leading to increased costs.
Innovation Solution
A method of controlling a power conversion device that determines the input power type (AC or DC) and adjusts the operation of switching elements to ensure only one conversion circuit performs high-frequency switching, while the other performs rectification, reducing the need for high-cost switching elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both conversion circuits are designed to perform high-frequency switching operations to enable bidirectional power conversion, then bidirectional power conversion capability is achieved, but device cost increases
Solution Approach 1:
The patent applies local quality by assigning different functional characteristics to different parts of the system. Specifically, one conversion circuit (first conversion circuit) is designed with high-frequency switching capability using appropriate switching elements, while the other conversion circuit (second conversion circuit) uses switching elements optimized for lower frequency operation. This localized differentiation allows bidirectional power conversion functionality while reducing overall device cost by avoiding the need for both circuits to use expensive high-frequency switching elements.
2Productivity
If high-frequency switching elements are used in both conversion circuits to ensure high-frequency switching operation, then power conversion efficiency is improved, but manufacturing cost increases
Solution Approach 1:
The patent implements local quality by optimizing each conversion circuit's switching elements according to its specific operational requirements. The first conversion circuit uses high-frequency switching elements when operating in high-frequency mode, while the second conversion circuit uses switching elements suited for its operational characteristics. This targeted approach ensures power conversion efficiency is maintained where needed while reducing manufacturing costs by not unnecessarily specifying high-frequency switching elements for both circuits.
Solution Approach 2:
The patent applies universality by designing the second conversion circuit's switching elements to handle multiple operational modes including rectification and inversion operations. These switching elements are selected to provide adequate performance across different operating conditions without requiring the highest frequency capabilities, thereby reducing cost while maintaining versatility.
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
This approach reduces costs by minimizing the use of high-frequency switching elements, enabling efficient and cost-effective bidirectional power conversion.
Implementation Method 1
a first conversion circuit having a first switching element for switching at a high speed
Implementation Method 2
a second conversion circuit having a second switching element... The second conversion circuit converts the first AC power input from the first conversion circuit and outputs it to an output terminal
Data Source
AI summary
Provided are a first conversion circuit having a first switching element for converting a power input from an input terminal into first AC power; and a second conversion circuit having a second switching element for selecting polarity of an output, converting the first AC power input from the first conversion circuit and outputting it to the output terminal. It is determined whether an input power to the input terminal is AC or DC and the operation of the first switching element and the second switching is controlled so that the second conversion circuit outputs DC power when it is determined that the input power is AC. The operation of the first switching element and the second switching element is controlled so that the second conversion circuit outputs a DC current or second AC power when it is determined that the input power is DC.