Bi-directional Isolated Power Conversion Device
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Solution Overview
Problem
Existing bi-directional power conversion devices are bulky, expensive, and have low efficiency due to simultaneous power conversion and isolation tasks, which complicates design and increases weight and cost, especially when used for energy storage applications like solar energy and electric vehicles.
Innovation Solution
A power conversion device comprising an AC/DC converter, a DC/DC converter, and a DC/DC isolation converter, where the DC/DC isolation converter is coupled between the AC/DC and DC/DC converters to achieve bi-directional isolation, allowing each converter to focus on its own conversion task, reducing weight, complexity, and cost while maintaining high efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the converter on the input side simultaneously performs power conversion and bi-directional isolation, then the device can achieve power conversion and isolation functions, but the weight and volume will be larger and the price will be more expensive
Solution Approach 1:
The patent divides the power conversion system into three independent modules: AC/DC converter, DC/DC isolation converter, and DC/DC converter. Each module performs a specific function, with the DC/DC isolation converter dedicated solely to bi-directional isolation. This segmentation allows each component to be optimized for its specific task, reducing overall weight and cost compared to a single converter handling both power conversion and isolation simultaneously.
Solution Approach 2:
The patent extracts the bi-directional isolation function from the power conversion process by introducing a dedicated DC/DC isolation converter between the AC/DC converter and the DC/DC converter. This extracted isolation module handles only isolation tasks, allowing the other converters to focus on power conversion efficiency, thereby reducing the weight and complexity of each individual component.
2Adaptability or versatility
If the converter on the input side simultaneously performs power conversion and bi-directional isolation, then the device can achieve power conversion and isolation functions, but the price will be more expensive
Solution Approach 1:
The patent segments the power conversion system into three independent modules, each optimized for its specific function. This segmentation allows for standardized manufacturing of each module type, reducing overall manufacturing cost through economies of scale and simplified production processes for each dedicated component.
Solution Approach 2:
By extracting the bi-directional isolation function into a separate DC/DC isolation converter, the patent enables each module to be manufactured independently with optimized bill of materials for its specific function, reducing overall component costs compared to a single multi-functional converter that would require more expensive and complex design.
3Adaptability or versatility
If the converter on the output side simultaneously performs power conversion and bi-directional isolation, then the device can achieve power conversion and isolation functions, but the design is difficult and the efficiency is low
Solution Approach 1:
The patent divides the system into three specialized modules where the DC/DC isolation converter is dedicated solely to bi-directional isolation between the AC/DC converter and the DC/DC converter. This segmentation simplifies the design of each individual module, as each is optimized for its specific function rather than attempting to handle multiple functions simultaneously.
Solution Approach 2:
The patent extracts the bi-directional isolation function from the output side DC/DC converter by introducing a separate DC/DC isolation converter in between. This extraction simplifies the DC/DC converter's design to focus only on power conversion, while the isolation converter handles isolation tasks, thereby reducing overall design complexity and improving efficiency.
4Adaptability or versatility
If the converter on the output side simultaneously performs power conversion and bi-directional isolation, then the device can achieve power conversion and isolation functions, but the efficiency is low
Solution Approach 1:
The patent segments the power conversion path into three efficient modules, where each module operates at its optimal efficiency point for its specific function. The DC/DC isolation converter is optimized for high-efficiency isolation with minimal power loss, allowing the AC/DC and DC/DC converters to maintain high conversion efficiency without the burden of additional isolation functions.
Solution Approach 2:
By extracting the bi-directional isolation function into a separate DC/DC isolation converter, the patent eliminates the efficiency penalties that would result from a single converter attempting to perform both power conversion and isolation simultaneously. The dedicated isolation converter minimizes power loss while enabling full bi-directional isolation capability.
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 a bi-directional power conversion device with wide adaptation to various battery and grid voltages, achieving high conversion efficiency and safe isolation, thus addressing the limitations of prior art devices.
Implementation Method 1
an AC/DC converter configured to convert AC power into a first DC power or convert the first DC power into the AC power
Implementation Method 2
a DC/DC converter configured to convert the first DC power into a second DC power or convert the second DC power into the first DC power
Data Source
AI summary
A power conversion device is disclosed herein. The power conversion device includes an AC/DC converter, a DC/DC converter, and a DC/DC isolation converter. The AC/DC converter is configured to convert AC power into a first DC power, or convert the first DC power into the AC power. The DC/DC converter is configured to convert the first DC power into a second DC power, or convert the second DC power into the first power. The DC/DC isolation converter is coupled between the AC/DC converter and the DC/DC converter, and configured to isolate the AC/DC converter and the DC/DC converter bi-directionally.