Transformerless LED Lighting Device for Ionizing Radiation
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Solution Overview
Problem
Existing lighting devices for rooms exposed to ionizing radiation suffer from poor resistance to ionizing radiation, leading to limited durability and potential fire hazards due to the degradation of components like step-down transformers and integrated circuits.
Innovation Solution
A lighting device design that utilizes a power supply circuit with a diode bridge and a lighting circuit comprising series-connected light-emitting diodes, Zener diodes, and resistors, optimized to withstand ionizing radiation, eliminating the need for voltage transformers and using components with improved radiation resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrical components (step-down transformer, integrated circuits, transistors) are used in lighting devices for radiation-exposed rooms, then the device can be manufactured with standard components and lower cost, but the resistance to ionizing radiation is poor and the duration of use is very limited
Solution Approach 1:
The invention removes vulnerable electrical components (step-down transformer, integrated circuits, transistors, electrolytic capacitors) from the lighting device. By eliminating these components that are sensitive to ionizing radiation, the device achieves resistance to radiation and extended duration of use in radiation-exposed environments
Solution Approach 2:
The invention changes the electrical parameters by operating LEDs directly from mains voltage (230V AC) without voltage transformation. By selecting LEDs with appropriate forward voltage characteristics that can withstand mains voltage, the device achieves both radiation resistance and prolonged operational life
2Ease of manufacture
If conventional electrical components with thin insulation are used, then the device complexity is reduced and manufacturing is easier, but the components are vulnerable to ionizing radiation which damages insulation and creates short circuits
Solution Approach 1:
The invention eliminates components with vulnerable insulation (transformer windings, integrated circuits) by removing them entirely from the system. This avoids the problem of radiation-damaged insulation causing short circuits while maintaining manufacturing simplicity through the use of basic radiation-resistant components
3Adaptability or versatility
If a step-down transformer is used to adapt mains voltage to LED operating voltage, then the lighting device can operate with standard LEDs, but the transformer is vulnerable to ionizing radiation and may cause fire
Solution Approach 1:
The invention removes the step-down transformer from the lighting device. By operating LEDs directly from mains voltage without transformation, the fire hazard associated with radiation-damaged transformer insulation is eliminated while maintaining voltage adaptation through direct connection of high-voltage tolerant LEDs
Solution Approach 2:
The invention turns the challenge of high mains voltage into an advantage by selecting LEDs with sufficient forward voltage ratings to operate directly from mains voltage. This eliminates the need for vulnerable transformers while ensuring the LEDs' inherent voltage characteristics provide the necessary adaptation
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 device achieves extended durability, capable of operating for at least ten years in high radiation environments and decades in less exposed areas, with improved resistance to ionizing radiation and reduced component degradation.
Implementation Method 1
a power supply circuit having an input for receiving an alternating current from a mains electricity network and an output adapted to deliver a direct current in response to the reception of the alternating current, the power supply circuit comprising a diode bridge
Implementation Method 2
a plurality of light-emitting diodes connected in series
Implementation Method 3
a plurality of light-emitting diodes connected in series
Implementation Method 4
a plurality of Zener diodes each connected in parallel with one or more light-emitting diodes of the plurality of light-emitting diodes
Data Source
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AI summary
[The invention relates to a lighting device for illuminating a room exposed to ionizing radiation, comprising: a power supply circuit having an input for receiving an alternating current from a mains electricity network and an output adapted to deliver a direct current in response to the reception of the alternating current, the power supply circuit comprising a diode bridge, and a lighting circuit (50) connected to the output of the power supply circuit, the lighting circuit comprising: a plurality of light-emitting diodes (51) connected in series, a plurality of Zener diodes (52) each connected in parallel with one or more light-emitting diodes of the plurality of light-emitting diodes and at least one resistor (53) connected in series with the plurality of light-emitting diodes,wherein a cumulative nominal supply voltage of the plurality of series-connected light-emitting diodes is matched to a nominal voltage of the mains electricity network.,