Semiconductor Switching Element Overcurrent Protection
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Solution Overview
Problem
Semiconductor switching elements in power modules face damage due to excessive current variation, which is difficult to manage without increasing device size or excessively reducing ground potential.
Innovation Solution
The semiconductor device includes semiconductor switching elements with specific pad configurations and wire connections to control ground potential, using emitter wires and resistors to manage induced electromotive forces and prevent overcurrent, while maintaining miniaturization and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If emitter wire is introduced to reduce ground potential of controller, then overcurrent damage is prevented, but device size is increased
Solution Approach 1:
The patent combines the emitter wire function with the existing wire structure by making the emitter wire directly connect to the extraction pad without intermediate connections. This merging of functions allows the ground potential reduction mechanism to be integrated into the existing wire layout, preventing overcurrent damage while avoiding additional space consumption from separate structural elements.
Solution Approach 2:
The patent extracts the ground potential reduction function from a separate controller ground connection and directly integrates it with the emitter wire connection to the extraction pad. By taking out this specific function and combining it with the existing emitter wire path, the design achieves overcurrent protection without requiring additional space for separate ground potential management structures.
2Reliability
If emitter wire is introduced to reduce ground potential of controller, then overcurrent damage is prevented, but ground potential is excessively reduced
Solution Approach 1:
The patent applies local quality by making the emitter wire directly connect to a specific extraction pad rather than distributing the connection across multiple pads or using a common ground connection. This localized connection approach ensures that the ground potential reduction effect is applied precisely where needed (at the extraction pad) without excessively affecting the overall controller ground potential, thereby preventing overcurrent damage while avoiding excessive ground potential reduction elsewhere in the system.
3Reliability
If multiple emitter pads are used, then current distribution is improved, but connection complexity is increased
Solution Approach 1:
The patent segments the emitter connection by providing multiple emitter pads on the semiconductor chip, allowing current to be distributed across multiple connection points. This segmentation improves current distribution and reduces hotspots while the direct connection of the emitter wire to one extraction pad keeps the overall connection structure relatively simple by avoiding complex inter-pad wiring.
Solution Approach 2:
The patent merges multiple emitter pads into a unified current distribution system where adjacent emitter pads are connected through the semiconductor chip's internal structure, and one of them is selected for direct external connection via the emitter wire. This merging approach allows current to flow through multiple paths internally while presenting a simplified external connection interface, thereby improving current distribution without proportionally increasing connection 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
This configuration effectively prevents semiconductor switching element damage by controlling ground potential and managing current, ensuring reliable operation without increasing device size or causing excessive ground potential reduction.
Implementation Method 1
the ground potential of the controller is reduced by induced electromotive force under switching of the semiconductor switching element
Implementation Method 2
a first wire for connecting adjacent pads out of the plurality of first emitter pads
Data Source
AI summary
A semiconductor device including a first semiconductor switching element having a first gate pad, a plurality of first emitter pads, and a first collector pad, a first wire for connecting adjacent pads out of the plurality of first emitter pads, a first output wire for connecting one of the plurality of first emitter pads to an output, a first controller for applying a gate voltage to the first gate pad, a first emitter wire that is directly connected to a first extraction pad which is any one pad of the plurality of first emitter pads, and is connected to the first controller to give a ground potential of the first controller, and a second semiconductor switching element having a second gate pad, a second emitter pad and a second collector pad connected to the output.