DC-DC Converter Noise Shielding via Segmented Housing
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Solution Overview
Problem
DC-DC converters in vehicles experience noise interference between circuit components, leading to emission noise and immunity noise issues, which affect the operation and compliance with noise regulation values, requiring additional structural components that increase cost, volume, and weight.
Innovation Solution
A noise shielding structure is implemented using a housing with separate spaces for high and low voltage circuit sections, a control circuit board, and a frame that supports the board, creating an enclosed conductor space at ground potential to reduce noise interference between circuit components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If DC-DC converter circuits are accommodated in a single housing, then ease of mounting is improved, but noise interference between circuit components increases
Solution Approach 1:
The housing is divided into multiple compartments by partition walls, separating the high voltage circuit section from the low voltage circuit section. This segmentation prevents noise interference between different voltage circuits while maintaining a compact integrated structure for easy mounting.
Solution Approach 2:
Different regions of the housing are assigned different functions: some regions contain high voltage circuits, others contain low voltage circuits, and partition walls are strategically placed to provide electromagnetic shielding where needed. This local differentiation reduces noise interference in sensitive areas while maintaining overall integration.
2Object-affected harmful factors
If additional structural components are added for noise reduction, then noise shielding effect is improved, but device complexity and weight increase
Solution Approach 1:
The noise shielding function is merged into the housing structure itself through integrated partition walls, rather than adding separate shielding components. The housing serves dual purposes: mechanical containment and electromagnetic shielding, reducing overall device complexity.
Solution Approach 2:
The housing structure performs multiple functions simultaneously: it provides mechanical support, contains circuit components, and acts as an electromagnetic shield through its partition walls. This multi-functionality eliminates the need for additional dedicated shielding components.
3Volume of moving object
If circuit components are placed closer together, then device size is reduced, but noise interference between components increases
Solution Approach 1:
The housing is segmented into compartments that allow circuit components to be placed close together for miniaturization, while partition walls within these compartments provide necessary electromagnetic shielding to prevent noise interference between adjacent components.
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 achieves a noise shielding effect without additional components, reduces the size and weight of the unit, simplifies assembly, and ensures compliance with noise regulation values by minimizing noise interference between circuit components.
Implementation Method 1
an enclosed space formed of a conductor having a GND potential... by a noise shielding effect obtained by an enclosed space formed of a conductor having a GND potential
Data Source
AI summary
As an object of reducing a noise resulted from the mutual influences between circuit-configuring components, a DC-DC converter includes a high voltage circuit section that is electrically connected to a transformer, a low voltage circuit section that is electrically connected to the transformer, a housing in which the high voltage circuit section and the low voltage circuit section are accommodated, a control circuit board that controls the driving of the low voltage circuit section, and a frame that supports the control circuit board. The frame is arranged on a position facing a bottom surface of the housing while crossing the low voltage circuit section. The housing includes a first wall that separates a first space in which the high voltage circuit section is accommodated and a second space in which circuit components configuring the low voltage circuit section are accommodated. The frame forms a second wall that protrudes toward a direction approaching a leading end of the first wall.