Semiconductor Assembly Snubber Circuit Turn-Off Capability
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Solution Overview
Problem
Fully controlled power semiconductor devices face turn-off failures when handling large currents due to insufficient turn-off capability, leading to inefficiencies in large capacity system turn-off applications.
Innovation Solution
A semiconductor assembly comprising a fully controlled power electronic device connected in parallel with a snubber circuit, which includes a capacitor, inductor, resistor, diode, and half-controlled power electronic device, forming a resonance circuit to enhance turn-off capability and reduce power device usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a fully controlled power semiconductor device is used to turn off large current, then turn-off speed is fast and rated current turning off is good, but turn-off capability becomes insufficient and turn-off failure occurs
Solution Approach 1:
The patent introduces a half-controlled power electronic device as an intermediary component to assist the fully controlled device in turning off large currents. The half-controlled device acts as a mediator that provides the necessary current interruption capability when the fully controlled device alone is insufficient, thereby resolving the contradiction between fast turn-off speed and adequate turn-off capability.
Solution Approach 2:
The patent segments the current turn-off function into two parts: the fully controlled power electronic device handles the initial current interruption and provides fast turn-off speed, while the half-controlled power electronic device handles the remaining current commutation and provides sufficient turn-off capability. This functional segmentation allows each component to operate within its optimal performance range.
2Reliability
If higher power devices are used to improve turn-off capability, then large current turn-off is achieved, but production costs increase and device complexity increases
Solution Approach 1:
Instead of using a single high-power fully controlled device that would be excessively expensive and complex, the patent employs partial action by combining a fully controlled device (for fast response) with a half-controlled device (for current commutation). This partial deployment of control functionality in each component achieves the required turn-off capability at lower cost and complexity than a single high-power device would provide.
3Reliability
If a snubber circuit is added to improve turn-off capability, then large current handling is enhanced, but device complexity increases
Solution Approach 1:
The half-controlled power electronic device in the snubber circuit serves multiple functions: it provides current commutation capability, limits voltage spikes, and assists in energy dissipation. By making this component multi-functional, the patent reduces the need for additional separate circuit elements, thereby limiting the increase in overall device complexity while still achieving improved turn-off capability.
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 semiconductor assembly effectively improves turn-off capability, reduces production costs, and enhances apparatus capacity by utilizing a half-controlled power electronic device for auxiliary turn-off, avoiding the need for higher power devices.
Implementation Method 1
the snubber circuit includes a capacitor, an inductor, a resistor, a diode and a half controlled power electronic device; the inductor and the half controlled power electronic device are connected in series and are together connected to the resistor in parallel; and the diode and the resistor are connected in parallel and are together connected to the capacitor in series
Data Source
AI summary
The present invention discloses a semiconductor assembly. The semiconductor assembly comprises a fully controlled power electronic device and a snubber circuit, wherein the snubber circuit is connected to the fully controlled power electronic device in parallel; the snubber circuit comprises a capacitor (C), an inductor (L), a resistor (R), a diode (D) and a half controlled power electronic device (A1); the inductor (L) and the half controlled power electronic device (A1) are connected in series and are together connected to the resistor (R) in parallel; and the diode (D) and the resistor (R) are connected in parallel and are together connected to the capacitor (C) in series.