Modular Power Converter for Engine Generator
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Solution Overview
Problem
Power conversion systems in mobile equipment, such as engine-driven generators, face challenges in achieving compact, reliable, and robust designs that can withstand demanding environmental conditions and vibrations, particularly in the layout and packaging of power conversion components.
Innovation Solution
A power converter design featuring an insulative support with a rectifier module, plate-like DC bus elements, and a power converter circuit that converts AC power to a desired output power, along with a drive circuit board for controlling the power converter, optimized for compact and efficient packaging and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If power conversion components are packaged in a compact arrangement, then the device size is reduced, but the reliability under demanding environmental conditions may deteriorate
Solution Approach 1:
The power conversion system is divided into modular components (rectifier module, inverter module, control module) that can be independently designed, tested, and replaced. This segmentation allows each module to be optimized for compactness while maintaining overall system reliability through modular architecture.
Solution Approach 2:
A common DC bus serves as an intermediary between the rectifier and inverter modules, enabling independent optimization of each AC-DC and DC-AC conversion stage. This intermediary structure allows compact packaging while maintaining reliable power conversion through standardized interfaces and isolated control.
2Volume of moving object
If power conversion components are packaged in a compact arrangement, then the device size is reduced, but the complexity of layout and packaging increases
Solution Approach 1:
The system is segmented into standardized modules with defined interfaces, reducing layout complexity despite compact packaging. Each module (rectifier, inverter, control) can be independently positioned around the common DC bus, simplifying the overall packaging arrangement.
Solution Approach 2:
The common DC bus structure provides universal connectivity for different power conversion modules, enabling standardized interfaces and simplified packaging. The same bus architecture supports multiple module configurations, reducing the complexity of custom layout designs.
3Reliability
If robust packaging is used to withstand vibrations and environmental conditions, then the reliability is improved, but the device size increases
Solution Approach 1:
Multiple functional modules (rectifier, inverter, control) are merged into a single integrated power conversion system with shared mechanical support and common DC bus. This consolidation provides robust vibration resistance through unified mounting while minimizing overall device volume compared to separate enclosures.
Solution Approach 2:
The modules are arranged in a three-dimensional configuration around the common DC bus, utilizing vertical and lateral space efficiently. This spatial arrangement provides robust mechanical support and vibration resistance while maintaining compact external dimensions through optimized internal packaging.
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 provides a robust, compact, and efficient power conversion system suitable for mobile applications, enhancing reliability and versatility in power output for welding and plasma cutting systems by optimizing the layout and packaging of power conversion components.
Implementation Method 1
The rectifier module is configured to receive AC power from a source
Implementation Method 2
a power converter circuit supported by the insulative support and contacting the DC bus elements to receive the DC power and to convert the DC power to a desired output power
Data Source
AI summary
A power converter for an engine generator includes an insulative support that receives and supports circuit components for converting incoming AC power to desired power, such as power suitable for a welding application. One or more rectifier modules are provided that are received and supported by the support. Three such modules may be provided for receiving three phase power from a generator. DC power from the rectifier module is applied to DC bus plates. The plates may be coupled to capacitors. A power conversion circuit, such as a buck converter, is coupled to the DC bus plates to convert the DC power to output power.