Conductive Base Plate Noise Suppression in Power Converters
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Solution Overview
Problem
Existing electric power converters face challenges in effectively suppressing noise propagation from the main circuit to the control circuit due to interconnection members, leading to potential variations and malfunctions, and current solutions either require additional noise reduction components or compromise on miniaturization and cost.
Innovation Solution
The design incorporates an enclosure with two adjacent openings and a base plate connected to the control circuit board, where the base plate is made of conductive material and electrically connected to the enclosure's GND, minimizing noise propagation by canceling induced currents through strategic positioning and material selection, thereby eliminating the need for additional noise reduction components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an electromagnetic blocking member is inserted between the gate driver circuit board and the power module to suppress noise propagation, then noise suppression is improved, but openings must be bored in the blocking member for interconnection members, which causes noise current flow and potential variation
Solution Approach 1:
A conductive base plate is introduced as an intermediary element between the control circuit board and the enclosure. The base plate provides a low-impedance path for noise currents, acting as a mediator that safely channels electromagnetic interference away from sensitive control circuits while maintaining proper grounding through the enclosure.
Solution Approach 2:
The invention changes the electrical parameter of the blocking structure by using a conductive base plate with specific electrical conductivity properties. This parameter change allows the structure to transform from a simple physical barrier to an active noise management component that can dissipate and redirect noise currents through controlled electrical pathways.
2Object-affected harmful factors
If the power module and gate driver are housed in respective shielded enclosures to prevent noise mixing, then noise isolation is improved, but through-holes are required for interconnection members, which induce noise current and cause enclosure potential variation
Solution Approach 1:
The base plate merges multiple functions into a single component: it serves as the mounting structure for the control circuit board, provides electromagnetic shielding, establishes grounding connection through the enclosure, and manages noise current pathways. This consolidation eliminates the need for separate through-holes in the enclosure while achieving noise isolation.
Solution Approach 2:
The conductive base plate performs multiple functions simultaneously: structural support for the control circuit board, electromagnetic shielding barrier, noise current dissipation path, and grounding connection element. This multi-functionality replaces the need for dedicated noise reduction components and through-holes in traditional enclosure designs.
3Object-affected harmful factors
If additional noise reduction components are added to suppress noise propagation, then noise suppression is improved, but device complexity and cost increase
Solution Approach 1:
The base plate is designed as a multi-functional component that simultaneously provides structural support, electromagnetic shielding, and noise current management. By integrating these functions into a single element, the invention eliminates the need for additional dedicated noise reduction components, thereby reducing overall device complexity and cost.
Solution Approach 2:
The conductive base plate inherently provides noise suppression functionality through its material properties and grounding connection, without requiring additional active noise reduction components. The structure serves itself by utilizing the natural electrical conductivity of the base plate material to dissipate noise currents, eliminating the need for complex active noise filtering systems.
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 blocks noise from the power module and gate driver from reaching the control circuit, preventing leakage and malfunctions, enabling miniaturization and cost reduction while maintaining high reliability.
Implementation Method 1
minimizing noise propagation by canceling induced currents through strategic positioning and material selection
Implementation Method 2
The base plate is made of conductive material and electrically connected to the enclosure's GND, minimizing noise propagation
Data Source
AI summary
There is provided a technology for realizing a low-cost electric power converter operating at low noise under a high-temperature environment. The electric power converter is provided with an enclosure, a power module including a switching element, a driver circuit for generating a signal for driving the switching element, a control circuit board for generating an actuating signal to be sent out to the driver circuit, a base plate with the control circuit board mounted thereon, and a connection part for connecting between the enclosure and the control circuit board. The enclosure is provided with two openings adjacent to each other, and the base plate or the opening of the enclosure is provided with the connection part.