Short-Circuit Semiconductor Element with Controlled Junction Destruction
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Solution Overview
Problem
Conventional short-circuit protection devices, such as thyristors, face challenges in reliably creating a defined short circuit without causing destruction of the semiconductor component, particularly due to issues with surge current handling, overheating, and plasma escape, which can lead to system damage.
Innovation Solution
A short-circuit semiconductor component with a semiconductor body featuring a rear base zone of one conductivity type, an inner region of complementary conductivity type, and a front base region, where at least one front or rear switch-on structure is embedded and activated by an ignition structure to inject a current pulse, irreversibly destroying semiconductor junctions and creating a permanent, low-impedance connection between electrodes, thus preventing plasma escape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional thyristors are used for short-circuit protection, then the device can block voltage in normal operation, but the semiconductor component may be destroyed by surge currents and overheating during short-circuit events
Solution Approach 1:
The patent extracts the harmful function of the thyristor during short-circuit events by designing it to be deliberately destroyed. The thyristor is taken out of the protective function and instead serves as a sacrificial element that channels surge currents through a controlled destruction mechanism, preventing plasma escape and protecting the overall system.
Solution Approach 2:
The patent converts the harmful surge current and overheating effects into a beneficial controlled destruction process. By designing the thyristor to fail in a predetermined manner, the harmful thermal and electrical stress is redirected through a controlled path that prevents plasma escape and protects surrounding components, turning potential system failure into a protective mechanism.
2Reliability
If mechanical switches are used for short-circuiting, then the switching action can be simple and reliable, but the switching time is too long (1-10 ms) and the switches may fail after prolonged disuse
Solution Approach 1:
The patent replaces the mechanical switching system with an electronic semiconductor-based system. The thyristor provides instantaneous electrical switching without moving parts, eliminating the 1-10 ms mechanical switching delay and the reliability issues associated with mechanical components after prolonged disuse.
3Reliability
If the thyristor is designed to handle high surge currents, then short-circuit protection capability is improved, but the device generates excessive heat requiring active cooling
Solution Approach 1:
The patent extracts the heat generation function from the thyristor by designing it to be destroyed rather than to continuously handle surge currents. The thyristor channels the surge current through a controlled destruction process that prevents plasma escape, and the heat is dissipated passively without requiring active cooling systems.
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 solution enables reliable and safe short-circuiting with long-term stability, low blocking losses, and the ability to operate without active cooling, significantly reducing switching times and improving safety and reliability by containing the energy conversion within the component.
Implementation Method 1
an electric current pulse with a predetermined energy input is injected into the semiconductor body between the ignition structure and the front and/or rear switch-on structure, in that the electric current pulse irreversibly destroys a first semiconductor junction
Implementation Method 2
the semiconductor body is subsequently destroyed by a current flowing via the front electrode and the rear electrode in such a way that an alloy is formed between the front electrode and the rear electrode
Data Source
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AI summary
A short-circuit semiconductor device (15, 22, 29, 34, 45, 52, 56, 59, 62, 66, 70, 72) has a semiconductor body (16) in which a rear base zone (6) of a first conductor type, an inner zone (7) of a second conductor type complementary to the first conductor type, and a front base zone (8) of the first conductor type are arranged. The rear base zone is electrically connected to a rear electrode (11), and the front base zone is electrically connected to a front electrode (10), wherein at least one front-side turn-on structure (17) is embedded in the front base zone and at least partially covered by the front electrode, and/or at least one rear-side turn-on structure (31) is embedded in the rear base zone and at least partially covered by the rear electrode.The activation structure is an emitter structure of the second conductor type electrically contacted with the electrode embedded on it. This emitter structure can be activated by means of at least one ignition structure (20) that acts electrically on it via the semiconductor body and can in turn be activated by means of an electrically supplied activation signal. In the activated state, the ignition structure injects an electrical current pulse into the semiconductor body, which irreversibly destroys a first semiconductor junction formed between the activation structure and the base zone embedding it, and/or a second semiconductor junction formed between this base zone and the inner zone. The invention also relates to a method for operating such a short-circuit semiconductor device (15, 22, 29, 34, 45, 52, 56, 59, 62, 66, 70, 72).