Power Converter PCB Layout for Short Gate-Terminal Spacing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In power conversion devices using wide bandgap semiconductor elements, the increased distance between semiconductor switching elements due to their packaging arrangement leads to operational instability, especially when operated by a single driver circuit, as it necessitates longer distances between the driver circuit and the elements, potentially causing noise coupling and reduced switching speed.
Innovation Solution
The power conversion device employs semiconductor switching elements with control terminals positioned closer than the length of their terminal sides, allowing for a shorter inter-control-terminal distance, which enhances operational stability by reducing the distance between the driver circuit and the elements, thus preventing noise coupling and improving switching efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If semiconductor switching elements are arranged with matched mounting directions to simplify coolant passage structure, then ease of manufacture is improved, but inter-element distance increases causing operational instability
Solution Approach 1:
The patent applies asymmetry by rotating semiconductor switching elements to different mounting directions rather than aligning them uniformly. Specifically, adjacent switching elements are arranged with different orientations to minimize the distance between their control terminals, while still maintaining simplified coolant passage structures. This asymmetric arrangement resolves the contradiction by prioritizing operational stability through reduced inter-element distance while preserving manufacturing simplicity.
2Reliability
If distance between semiconductor switching elements is reduced to improve operational stability, then reliability is improved, but noise coupling between elements increases
Solution Approach 1:
The patent applies local quality by making the spacing between semiconductor switching elements non-uniform. Specifically, the distance between control terminals of adjacent switching elements is minimized to improve operational stability, while other distances (such as between power terminals) are maintained at larger separations to reduce noise coupling. This localized optimization of spacing resolves the contradiction by addressing different spatial relationships differently.
3Speed
If semiconductor switching elements use surface-mount packages with short leads for high-speed operation, then speed is improved, but inter-control-terminal distance increases when operated by single driver circuit
Solution Approach 1:
The patent applies asymmetry by arranging semiconductor switching elements with different mounting directions to minimize the distance between their control terminals. This asymmetric arrangement allows surface-mount packages with short leads to maintain high switching speed while reducing the inter-control-terminal distance to acceptable levels, resolving the contradiction between speed and distance when multiple elements are operated by a single driver circuit.
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 stabilizes the operation of semiconductor switching elements by reducing the inter-control-terminal distance, preventing noise coupling, and ensuring efficient power conversion, even when multiple elements are operated by a single driver circuit.
Implementation Method 1
a cooling plate which cools the plural semiconductor switching elements
Data Source
Figure 1
Figure 2~3
Figure 4~6
AI summary
A power conversion device (90) includes a circuit board (31) on which wirings (33, 34, 35) are formed and plural semiconductor switching elements (1a, 1b) are mounted; and a driver circuit (2a) which is mounted on the circuit board (31), and operates at least two of the plural semiconductor switching elements (1a, 1b) together; wherein the plural semiconductor switching elements (1a, 1b) are provided as packages having a same shape, and placed in such a positional relationship in which an inter-control-terminal distance (L) that is a distance between their respective control terminals is shorter than a length (It) of a terminal side that is a side of each of the packages at which the control terminal (22) is placed.