Inverter Semiconductor Material Selection for Loss Reduction
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Solution Overview
Problem
Conventional inverters have higher loss and cost due to the use of the same type of semiconductor for all four transistors, leading to inefficiencies in switching and reverse recovery operations.
Innovation Solution
The inverter configuration includes transistors and diodes made of different semiconductor materials, with wide band gap semiconductors for high-switching and reverse recovery components and silicon for non-switching components, reducing switching and recovery losses while minimizing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If all four transistors are formed of the same type of semiconductor, then the device complexity is reduced and manufacturing is simplified, but the switching loss and recovery loss increase
Solution Approach 1:
The patent applies different semiconductor materials to different transistors based on their specific functional requirements. Transistors Q1 and Q2, which perform switching operations, are made of wide band gap semiconductor to reduce switching loss. Transistor Q3, which does not perform switching, is made of conventional semiconductor to reduce cost. This local differentiation resolves the contradiction by optimizing each component's material based on its specific operational demands rather than using a uniform material throughout the device.
Solution Approach 2:
The patent changes the material parameter (band gap width) of semiconductors used in different transistors to optimize performance. By selecting wide band gap semiconductor for switching transistors and conventional semiconductor for non-switching transistors, the patent achieves reduced switching loss and recovery loss while managing device complexity through parameter optimization rather than structural complexity.
2Loss of energy
If wide band gap semiconductors are used for all transistors and diodes, then the switching loss and recovery loss are reduced, but the manufacturing cost increases
Solution Approach 1:
The patent implements local quality by using wide band gap semiconductor only where it provides necessary performance benefits (in switching transistors Q1 and Q2 and reverse recovery diodes D3 and D4), while using conventional semiconductor for components where it is sufficient (non-switching transistor Q3 and non-reverse recovery diodes D1 and D2). This selective application reduces overall manufacturing cost while maintaining energy efficiency in critical components.
Solution Approach 2:
The patent applies this principle by using conventional semiconductor for transistor Q3, which does not perform switching operations and therefore does not require the superior high-frequency performance of wide band gap semiconductor. This allows the use of cheaper materials for components where high performance is not critical, reducing overall manufacturing cost while maintaining system effectiveness.
3Ease of manufacture
If conventional semiconductors are used for all components, then the manufacturing cost is reduced, but the switching loss and recovery loss increase
Solution Approach 1:
The patent resolves this contradiction by applying wide band gap semiconductor locally to components where it provides essential performance advantages (switching transistors and reverse recovery diodes), while using conventional semiconductor elsewhere. This ensures that energy loss is minimized in critical switching and recovery operations without incurring the full cost of wide band gap semiconductor throughout the entire device.
Solution Approach 2:
The patent optimizes the material parameter (band gap width) for each component based on its operational requirements. By changing the semiconductor material parameter selectively, the patent achieves reduced switching loss and recovery loss in critical components while managing manufacturing cost through targeted rather than universal application of advanced materials.
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 reduces switching and recovery losses while lowering costs by employing N-channel MOS transistors and Schottky barrier diodes made of wide band gap semiconductors for high-current applications and IGBTs and silicon diodes for lower current, non-reverse recovery operations.
Implementation Method 1
Each of the first transistor, the second transistor, the third diode, and the fourth diode is formed of a wide band gap semiconductor. Each of the third transistor, the fourth transistor, the first diode, and the second diode is formed of a semiconductor other than the wide band gap semiconductor.
Data Source
AI summary
An inverter includes: a first transistor (Q1) connected between a first input terminal (T1) and an output terminal (T4); a second transistor (Q2) connected between the output terminal (T4) and a second input terminal (T2); first and second diodes (D1, D2) connected in anti-parallel to the first and second transistors (Q1, Q2), respectively; and a bidirectional switch that is connected between a third input terminal (T3) and the output terminal (T4) and that includes third and fourth transistors (Q3, Q4) and third and fourth diodes (D3, D4). The first and second transistors (Q1, Q2) and the third and fourth diodes (D3, D4) are each formed of a wide band gap semiconductor. The third and fourth transistors (Q3, Q4) and the first and second diodes (D1, D2) are each formed of a semiconductor other than the wide band gap semiconductor.