DC-DC Converter Partition Wall for Eddy Current Noise Reduction
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Solution Overview
Problem
Existing DC-DC converter devices for electric automobiles and plug-in hybrid vehicles face challenges in reducing the superimposition of noise radiation, which affects filter performance due to electromagnetic noise generated by eddy currents in the housing.
Innovation Solution
The DC-DC converter incorporates a transformer, high and low voltage-side switching circuit sections, a noise filter circuit, a metallic case with a partition wall, and a drive circuit board mounted on a metallic base board, with the partition wall connected to the case to intercept noise currents and prevent them from reaching the filter circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metallic case is used to house the circuit components, then mechanical strength and electromagnetic shielding are improved, but eddy current noise is generated in the housing
Solution Approach 1:
The metallic case is divided into a first case and a second case by a partition wall. The first case houses the high voltage circuit, while the second case houses the low voltage circuit and filter. This segmentation prevents eddy currents from circulating throughout the entire metallic housing while maintaining the mechanical strength and electromagnetic shielding benefits of the metallic structure.
2Volume of moving object
If the filter circuit is placed close to the switching circuits for compactness, then device size is reduced, but noise superimposition on the filter increases
Solution Approach 1:
The device is divided into two separate cases: the first case containing the high voltage switching circuit, and the second case containing the low voltage filter circuit. This physical segmentation through the partition wall allows compact integration while preventing noise superimposition by isolating the filter from the switching circuits.
3Object-generated harmful factors
If a partition wall is added to separate circuits for noise reduction, then noise isolation is improved, but device complexity increases
Solution Approach 1:
The partition wall is integrated as part of the metallic case structure itself, combining the housing function with the noise isolation function. This merging approach provides effective noise isolation between high and low voltage circuits while avoiding the need for separate shielding structures, thereby limiting the increase in device complexity.
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 effectively reduces the influence of noise currents on the filter circuit, enhancing noise reduction while maintaining filter performance and compactness without the need for additional housing.
Implementation Method 1
the electromagnetic noise generated by the eddy current flowing in the housing
Data Source
AI summary
There is provided a device in which superimposition of noise radiated from a circuit is reduced, and a noise reducing effect of a filter is ensured. A DC-DC converter according to the present invention includes a transformer, a high voltage-side switching circuit section, a low voltage-side switching circuit section, a noise filter circuit section electrically disposed between the low voltage-side switching circuit section and the low voltage-side circuit section, a metallic case that houses the transformer, the high voltage-side switching circuit section, the low voltage-side switching circuit section, and the noise filter circuit section, a drive circuit board having a drive circuit that drives the low voltage-side switching circuit section, and a metallic base board having the drive circuit board mounted thereon. The case has a metallic partition wall connected to the case. The partition wall is disposed between the low voltage-side switching circuit section and the noise filter circuit section. The partition wall is connected to the base board.