Nuclear Alarm Semiconductor Heating for Radiation Resistance

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Solution Overview

Problem

Hazard detectors, such as fire detectors, face significant challenges in areas with increased radioactive radiation due to the destructive effects of ionizing radiation on semiconductor components, leading to reduced service life and functionality.

Innovation Solution

A temperature control circuit is implemented to regulate non-radiation-resistant semiconductor components to a predetermined operating temperature range of 60°C to 160°C, increasing the hole recombination rate and maintaining the switching threshold voltage within a permissible tolerance band, thereby extending the functional service life in radiation-exposed areas.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If non-radiation-resistant semiconductor components are used in high-radiation environments, then device complexity and cost are reduced, but the functional service life is significantly reduced due to radiation-induced threshold voltage shifts

Engineering Contradiction:

Improvefunctional service lifeVSAvoidradiation damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies parameter changes by heating the semiconductor component to elevated temperatures (e.g., 80°C to 150°C) to increase the recombination rate of trapped positive charge carriers. This temperature parameter change counteracts the radiation-induced threshold voltage shift by reducing the accumulation of trapped charges, thereby extending the functional service life of non-radiation-resistant components in high-radiation environments

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts the harmful effect of radiation-induced trapped positive charge carriers into a beneficial effect by using thermal energy to accelerate their recombination. The trapped charges that cause threshold voltage drift are transformed from a harmful accumulation into a dynamic equilibrium where thermal recombination continuously reduces their concentration, extending component reliability

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Reliability

If cooling is applied to reduce threshold voltage drift, then service life is extended, but device complexity and energy consumption increase

Engineering Contradiction:

Improvethreshold voltage stabilityVSAvoidtemperature control system

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent inverts the conventional approach by applying heating instead of cooling to stabilize threshold voltage. While traditional methods use cooling to reduce thermal effects, this patent demonstrates that heating to specific elevated temperatures increases the recombination rate of trapped charges, achieving better threshold voltage stability in radiation environments without requiring complex active cooling systems

Inventive Principle:

Principle #13The other way round (Inversion)

3Reliability

If radiation-resistant semiconductor components are used, then functional service life is extended, but cost and device complexity increase significantly

Engineering Contradiction:

Improveradiation resistanceVSAvoidcomponent specification

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent enables the use of inexpensive, non-radiation-resistant semiconductor components in radiation environments by applying thermal management. Instead of requiring expensive radiation-hardened components, the system uses standard commercial components that are heated to maintain reliability, effectively replacing costly specialized components with cheaper standard components plus a simple heating mechanism

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 significantly extends the operational life of semiconductor components in high-radiation environments, ensuring reliable functionality for a minimum of three years by compensating for increased electrical hole conductivity induced by radiation, thus maintaining detector performance.

Implementation Method 1

A temperature control circuit is implemented to regulate non-radiation-resistant semiconductor components to a predetermined operating temperature range of 60°C to 160°C

Methodology Applied

Scientific EffectHeating: Heating

Implementation Method 2

increasing the hole recombination rate and maintaining the switching threshold voltage within a permissible tolerance band

Methodology Applied

Scientific EffectHole recombination:

Data Source

PatentEP2595126B1Alarm for use in the nuclear field with a heating system for heating semiconductor elements that are not typically radiation resistant to improve functional service life

Publication Date: 2019.03.06 SIEMENS SCHWEIZ AG

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AI summary

The danger detector (1) has a detector unit that is provided for detecting a danger characteristic. A semiconductor component and other electrical components are provided for outputting an alarm signal. A temperature control circuit is configured to control temperature of the semiconductor component. The semiconductor component is provided with a processor-backed microcontroller.