Annular Core Noise Suppression in Power Conversion Connectors
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Solution Overview
Problem
The proximity of the connection detection line to the high voltage power line in connectors leads to potential noise radiation and mixture due to space propagation, compromising the reliability of power conversion systems in electric vehicles.
Innovation Solution
The integration of an annular magnetic core and a partition member within the power conversion device's housing separates the high voltage power line and connection detection line, utilizing the annular core as a common mode choke to suppress common mode noise and prevent wiring intersection, thereby reducing noise radiation and mixture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the connection detection line is arranged close to the high voltage power line in the connector, then the connector structure is simplified and easier to manufacture, but noise radiation and mixture occur due to space propagation
Solution Approach 1:
A magnetic shielding member (annular core) is introduced as an intermediary between the high voltage power line and the connection detection line. This magnetic shielding member intercepts and guides magnetic flux, preventing direct coupling between the two lines while maintaining their close proximity in the connector structure.
Solution Approach 2:
The connector interior space is segmented into distinct regions using a partition member. The high voltage power line and connection detection line are placed in different segments, separated by the partition wall, which physically divides the space to prevent noise propagation while maintaining manufacturing simplicity.
2Device complexity
If the connection detection line is arranged adjacently parallel to the high voltage power line, then the connector design is simplified, but the reliability of the connection detection is compromised due to noise mixture
Solution Approach 1:
The magnetic shielding member acts as a mediator that blocks magnetic flux from the high voltage power line from reaching the connection detection line. This intermediary structure maintains the simple adjacently parallel arrangement while ensuring detection reliability by preventing noise interference.
Solution Approach 2:
The magnetic shielding member provides localized magnetic shielding only in the critical region where the two lines are in close proximity. This localized intervention maintains overall design simplicity while specifically addressing the reliability issue at the noise-prone interface between the two lines.
3Device complexity
If no separation structure is used between power lines and detection lines, then the device structure is simpler, but noise radiation and mixture compromise system reliability
Solution Approach 1:
The magnetic shielding member and partition member serve as intermediary structures that provide effective noise isolation without significantly increasing overall device complexity. These intermediaries are strategically placed only where needed to block noise paths, maintaining structural simplicity while enhancing system reliability.
Solution Approach 2:
The magnetic shielding member and partition member are combined into an integrated structure that performs both magnetic shielding and physical separation functions simultaneously. This merging of functions reduces the number of separate components needed, maintaining device structural simplicity while providing comprehensive noise protection for reliable power conversion operation.
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 suppresses noise radiation and mixture between the power line and connection detection line, enhancing the reliability and efficiency of power conversion systems by maintaining a constant distance and preventing adjacent intersections.
Implementation Method 1
utilizing the annular core as a common mode choke to suppress common mode noise
Data Source
Figure 1
Figure 2
Figure 3(a)~3(b)
AI summary
To effectively suppress radiation and mixture of noise superimposed on a power line into a connection detection line. A power conversion device includes: a connector 200 having a wiring line 210 which transmits DC power; and a housing 101 in which the connector is arranged. The connector has a connection detection wiring line 220 which detects whether the connector is connected with an external circuit. An opening part 120 which connects with the connector is formed in the housing. An annular core 500 formed of a magnetic substance is inserted through the opening part. The annular core is an annular member formed with a through-hole. The wiring line and the connection detection wiring line are introduced into an inside of the housing through the through-hole of the annular core.