Power Semiconductor Clamping Structure for Transient Overvoltage Protection
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Solution Overview
Problem
Power semiconductor components lack effective real-time control and protection against rapid transient faults and overvoltages in medium- and high-voltage systems, such as those caused by lightning strikes, leading to potential damage and system instability.
Innovation Solution
A power semiconductor component with integrated breakdown structures of two types, which are activated by different voltage thresholds, providing internal overvoltage protection without the need for external protective circuits, ensuring safe operation by limiting surge voltages and preventing damage to the component and its environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional power semiconductor components are used in medium/high-voltage networks, then normal operation is enabled, but they lack real-time protection against rapid transient faults and overvoltages
Solution Approach 1:
The patent combines multiple protective functions (voltage breakdown protection and dv/dt protection) directly into the semiconductor body by integrating breakdown structures into the base zones. This merging of protection functions into the main component eliminates the need for separate external protective circuits, thereby improving reliability while avoiding increased device complexity.
Solution Approach 2:
The semiconductor component performs self-protection through internally integrated breakdown structures that automatically activate during overvoltage events. The component monitors and protects itself without requiring external control or additional protective devices, enabling real-time response to transient faults while maintaining simple overall system architecture.
2Reliability
If external protective circuits are added to provide overvoltage protection, then protection capability is improved, but device complexity and structural effort increase
Solution Approach 1:
The patent merges the protective functions into the semiconductor body itself by integrating breakdown structures directly into the base zones. This eliminates the need for separate external protective circuits, reducing the total number of components while maintaining comprehensive overvoltage protection capability.
Solution Approach 2:
The semiconductor component becomes multi-functional by incorporating both power switching capability and overvoltage protection functions within a single device. The integrated breakdown structures enable the component to perform both its primary function and protective function without requiring additional specialized components.
3Speed
If the semiconductor is triggered by light pulse or electrical signal with external fault protection circuit, then normal switching control is enabled, but real-time response to extremely rapid transient faults is insufficient
Solution Approach 1:
The breakdown structures are pre-integrated into the semiconductor body during manufacturing, positioned within the base zones to provide immediate protective action. When overvoltage occurs, the pre-positioned breakdown structures activate instantly without requiring external signal processing or control circuitry, enabling real-time response to transient faults.
Solution Approach 2:
The semiconductor component autonomously detects and responds to overvoltage conditions through its internally integrated breakdown structures. The component self-activates protective mechanisms without requiring external control signals or fault detection circuits, achieving instantaneous real-time protection against destructive overvoltages.
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 component effectively limits and clamps overvoltages, preventing damage and ensuring system safety during high-voltage events, such as lightning strikes, by activating internal protection mechanisms that manage voltage gradients and thresholds, thereby safeguarding the semiconductor and the electrical system.
Implementation Method 1
at least one triggering structure (13) is provided as a breakdown structure of a first type, which is designed to be activated when a high voltage above a predetermined voltage level (=breakdown voltage), forming its activation signal, is applied between the front-side electrode and the rear-side electrode
Implementation Method 2
at least one additional triggering structure is provided as a breakdown structure of a second type, which is designed to be activated when a high voltage above a predetermined voltage gradient, forming its activation signal, is applied between the front-side and the rear-side electrode
Implementation Method 3
the activation structure can be switched on by means of at least one triggering structure which electrically acts on it via the semiconductor body
Data Source
AI summary
A power semiconductor component for voltage limiting includes a rear-side base zone electrically contacted with a rear-side electrode and a front-side base zone electrically contacted with a front-side electrode. At least one switch-on structure is embedded at least into one of the rear-side base zone and the front-side base zone and is electrically contacted by the electrode contacting the embedding base zone. At least one triggering structure is provided as a breakdown structure of a first type, present between the front-side and rear-side electrodes. At least one further triggering structure is provided as a breakdown structure of a second type, present between the front-side and rear-side electrodes. The front-side and rear-side electrodes are each electrically conductively pressure-contacted by an electrically conductive contact plate at least one of which functions as a heat sink for dissipating heat generated in the semiconductor body.