Power Unit Core Placement for Radiation Noise Reduction
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Solution Overview
Problem
Conventional power conversion apparatuses face limitations in radiation noise reduction due to the lack of space within the power unit to install noise-reducing cores, which restricts the effectiveness of noise reduction measures.
Innovation Solution
The power unit is designed to include a core through which conductor bars pass, allowing the core to be positioned closer to the semiconductor device, thereby enhancing radiation noise reduction by utilizing the space within the power unit efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the core is installed outside the power unit, then the power unit structure remains simple, but the radiation noise reduction effect is limited
Solution Approach 1:
The core is nested inside the power unit housing, with the conductor bars passing through the core which is positioned within the confined space. This nesting approach allows the core to be integrated into the existing power unit structure without requiring external installation, thereby achieving better noise reduction while maintaining structural simplicity.
Solution Approach 2:
The patent utilizes the vertical space dimension within the power unit by positioning the core and arranging conductor bars to pass through it in a direction that optimizes noise reduction. This dimensional arrangement allows effective noise reduction without increasing the horizontal footprint or overall complexity of the power unit.
2Object-affected harmful factors
If the core is positioned closer to the inverter, then the radiation noise reduction effect is enhanced, but the space arrangement becomes more difficult
Solution Approach 1:
The power unit housing is designed with flexible space allocation that accommodates the core and conductor bars in close proximity to the inverter. The housing structure allows for dynamic arrangement of internal components, enabling the core to be positioned optimally for noise reduction while maintaining ease of assembly and space utilization.
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 significantly reduces radiation noise by positioning the core closer to the noise source, improving noise reduction performance compared to conventional setups.
Implementation Method 1
a first core through which the first output-side conductor bar, the second output-side conductor bar, and the third output-side conductor bar pass, and that is included inside the power unit
Implementation Method 2
a cooling fin for cooling the inverter, and that dissipates heat generated from the semiconductor device part
Data Source
AI summary
To reduce radiation noise generated when a semiconductor device in a power unit performs switching, a core is provided outside the power unit. The closer the core is disposed to the semiconductor device that is generating the radiation noise, the greater the effect of reducing the radiation noise is obtained. However, since there has been no space to provide the core inside the power unit, there has been a limitation in the reduction of radiation noise. The invention provides a power unit including a core in the interior thereof. In order to install a first core inside the power unit, a first output-side conductor bar, a second output-side conductor bar, and a third output-side conductor bar are connected to an output of an inverter include a first bundle portion. The first bundle portion passes through a first penetrating opening of the first core provided inside the power unit.