Power Converter Base-to-Case Layout for Drive Board EMI Shielding
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Solution Overview
Problem
The existing power conversion devices have limitations in effectively reducing electromagnetic noise propagation from the power semiconductor module to the drive circuit board due to a limited ground contact area, which restricts the noise reduction effectiveness.
Innovation Solution
A power conversion device design that increases the contact area between the base member supporting the drive circuit board and the case, allowing for enhanced electromagnetic noise dissipation from the base member to the case, thereby reducing noise influence on the drive circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the third fixing part is directly connected to the case at one corner of the rectangular second base plate, then the structure is simple and easy to manufacture, but the contact area between the base plate and the case is limited, which restricts the effectiveness of electromagnetic noise dissipation
Solution Approach 1:
The single corner connection is segmented into multiple fixing parts distributed at different locations (corners and intermediate positions) on the base plate, transforming one集中 connection into multiple distributed connections to increase overall contact area while maintaining structural simplicity
Solution Approach 2:
The connection is extended from a point contact (corner) to area contact by adding multiple fixing parts across the base plate surface, utilizing the two-dimensional plane of the base plate to maximize contact area with the case for improved electromagnetic noise dissipation
2Object-affected harmful factors
If the contact area between the base member and the case is increased, then the electromagnetic noise dissipation effectiveness is improved, but the device complexity increases
Solution Approach 1:
The multiple fixing parts serve dual functions: they provide structural support and mounting for the base plate while simultaneously acting as electromagnetic shielding contact points, eliminating the need for separate shielding structures and reducing overall device complexity despite increased number of parts
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 design effectively reduces the impact of electromagnetic noise on the drive circuit board, improving noise protection and performance in power conversion devices.
Implementation Method 1
electromagnetic noise is generated in the current conversion circuit portion of the power semiconductor module, and propagates from the power semiconductor module or a connection wiring between the power semiconductor module and an electric circuit component arranged around the power semiconductor module toward the second base plate and the control circuit board
Implementation Method 2
the electromagnetic noise propagating toward the control circuit board can be blocked by the second base plate, and the electromagnetic noise can flow from the second base plate to the ground through the case
Data Source
AI summary
An object of the present invention is to provide a power conversion device capable of reducing an influence of electromagnetic noise propagating from a circuit body toward a drive circuit board.A power conversion device 100 of the present invention includes a circuit body 6 that converts a direct current into an alternating current, a drive circuit board 5 that drives the circuit body 6, a base member 4 provided between the circuit body 6 and the drive circuit board 5, and a case 1 that houses the circuit body 6 and the base member 4. The base member 4 includes a first flow channel forming portion 4A that forms a flow channel space 1C1 between the circuit body 6 and the base member 4, and a first extending portion 4B2 extending from the flow channel forming portion 4A and connected to an inner surface of the case 1.