Fuel Cell Boost Converter Compact Layout
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Solution Overview
Problem
In fuel cell vehicles, the compact arrangement of a fuel cell stack and boost converter in a center tunnel is hindered by the large dimensions of reactors, switching elements, and cooling piping, which restricts the reduction of the boost converter's width and poses challenges in space utilization and safety design, particularly when considering collision scenarios.
Innovation Solution
The boost converter's connecting portions are arranged side by side along the forward-backward direction of the vehicle, with reactors positioned below the switching circuit sections and bus bars strategically placed to minimize width, and a capacitor is interposed between refrigerant pipings to manage heat and reduce the overall volume, while current measuring means and refrigerant flow paths are optimized to enhance efficiency and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the boost converter is disposed in the center tunnel, then the wiring installation length is shortened and space under the floor panel is effectively utilized, but the dimension of the boost converter in the right-left direction cannot be decreased due to large-sized constitutional elements
Solution Approach 1:
The patent reorganizes the internal layout of the boost converter by arranging reactors, switching elements, and bus bars in a three-dimensional configuration that optimizes space utilization. Specifically, reactors are positioned at corners, switching elements are mounted on inner walls, and bus bars are routed through the center, creating an efficient use of the available volume without increasing the external width.
Solution Approach 2:
The patent implements a nested arrangement where switching elements are mounted on the inner walls of the housing, effectively utilizing the vertical space and wall surfaces. The bus bars are routed through the center region, nesting the electrical connection paths within the structural framework of the converter, thereby maximizing space efficiency.
2Length of moving object
If reactors and switching elements are arranged to minimize width, then the boost converter fits in the center tunnel, but the arrangement of bus bars and cooling piping becomes complex
Solution Approach 1:
The patent employs asymmetric arrangement strategies where reactors are positioned at specific corners rather than symmetrically, and bus bars are routed through the center region rather than evenly distributed. This asymmetric layout optimizes the paths for electrical connections and cooling piping, reducing overall complexity while maintaining compact dimensions.
Solution Approach 2:
The patent introduces a central region that serves as an intermediary space for routing bus bars and cooling piping. This central corridor acts as a mediator that organizes the complex interconnections between reactors, switching elements, and external components, simplifying the overall arrangement by providing a dedicated pathway for electrical and thermal management systems.
3Length of stationary object
If the floor panel height is kept low, then seating space is acquired, but the arrangement of cooling piping and bus bars is restricted
Solution Approach 1:
The patent utilizes the inner walls of the housing as flexible mounting surfaces for switching elements. By mounting these components on the vertical inner walls rather than requiring horizontal space, the design achieves compact height while providing adequate space for electrical connections and cooling pathways.
Solution Approach 2:
The patent transitions from horizontal arrangement to vertical arrangement by mounting switching elements on inner walls and routing bus bars through the center. This dimensional reorganization allows the cooling piping and electrical connections to be arranged in the vertical dimension, preserving low floor panel height while maintaining functional requirements.
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 configuration allows for a more compact and efficient arrangement of the boost converter within the center tunnel, preventing the rise of the floor panel height, optimizing seating space, and ensuring effective cooling and noise reduction, thereby enhancing the vehicle's safety and operational performance.
Implementation Method 1
fuel cells which are direct-current power sources
Implementation Method 2
reactors each having one end connected to the power input portion
Implementation Method 3
a cooling piping through which a refrigerant circulates to cool the switching elements
Data Source
AI summary
This fuel cell vehicle comprises a DC-DC converter constituted of a power input portion, reactors, and switching circuit sections. Connecting portions of the power input portion to the reactors and connecting portions of the reactors to the switching circuit sections in the DC-DC converter are all arranged side by side along a forward-backward direction of the vehicle, and arranged in this state on the side of one side surface of the DC-DC converter on one of the right side and left side of the vehicle.