Power Semiconductor Module Switching Noise Cancellation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional power semiconductor modules fail to adequately suppress switching noise in certain regions, leading to inefficiencies in power conversion operations.
Innovation Solution
A power semiconductor module design featuring a first conductive layer with electrodes on one surface of an insulating layer, a second conductive layer on the other surface, and a capacitor connecting arbitrary electrodes, allowing for charging/discharging currents to cancel magnetic fields generated by current flow through both layers, thereby reducing switching noise across all operational regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional power semiconductor module structures are used with throughholes connecting conductive layers, then the module can perform power conversion operations, but switching noise is not adequately suppressed in certain regions
Solution Approach 1:
The patent introduces a capacitor that generates a charging/discharging current to counteract the harmful magnetic field generated by the switching current. By converting the harmful magnetic field effect into a beneficial cancellation effect, the switching noise is suppressed while maintaining power conversion efficiency
Solution Approach 2:
The capacitor acts as an intermediary element between the conductive layers. It generates a charging/discharging current that serves as a mediator to cancel the magnetic field produced by the switching current, thereby reducing switching noise without directly modifying the switching operation
2Object-affected harmful factors
If a capacitor is added to connect arbitrary electrodes to enable magnetic field cancellation, then switching noise is reduced, but the device complexity increases
Solution Approach 1:
The capacitor is designed to connect arbitrary electrodes, giving it universal applicability across different regions of the module. This multi-functional approach allows a single capacitor design to serve multiple noise cancellation purposes, reducing the need for multiple specialized components and 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
The module effectively reduces switching noise in all regions, improving power conversion efficiency by ensuring no area remains with unsuppressed noise, as opposed to conventional designs where noise cancellation is incomplete.
Implementation Method 1
when a current flows through the second conductive layer at a location opposing the capacitor, a charging/discharging current occurs in the capacitor in a direction opposite to the direction of the current flowing through the second conductive layer
Implementation Method 2
a charging/discharging current occurs in the capacitor in a direction opposite to the direction of the current flowing through the second conductive layer
Data Source
AI summary
In a power semiconductor module, a first conductive layer including first to fourth electrodes are formed on one of principal surfaces of an insulating layer, and a conductive substrate functioning as a second conductive layer is formed on the other one of principal surfaces. Current paths are switched by controlling switching of a first transistor and a second transistor disposed on a surface of the first conductive layer thereby performing a power conversion. A capacitor is connected, in a region, between the first electrode and the second electrode. When a current flows in the region through the second conductive layer, a charging/discharging current occurs in the capacitor, which results in magnetic field cancellation.