Research Article
Emerging Designs and Strategies for Overvoltage Protection in Modern Electronics
Issue:
Volume 13, Issue 6, December 2025
Pages:
242-254
Received:
26 July 2025
Accepted:
11 August 2025
Published:
1 December 2025
Abstract: Rising adoption of low-voltage DC electronics demands robust overvoltage protection for wide input ranges (3-30V). We address this with an integrated module combining: (1) Astable boost converter (<5V activation), (2) LM317 regulator (5V±1.5% stability), and (3) LM339 comparator-driven cutoff (>5.1V, <1.2 ms response). NI MULTISIM simulation and hardware validation confirm ≤ ±1.5% output deviation across solar/battery/DC sources (0-800 mA). The design outperforms discrete solutions with 57% cost reduction vs. buck-boost ICs, seamless transitions, and 30V surge resilience—establishing a scalable framework for resilient power management in deployable systems.
Abstract: Rising adoption of low-voltage DC electronics demands robust overvoltage protection for wide input ranges (3-30V). We address this with an integrated module combining: (1) Astable boost converter (<5V activation), (2) LM317 regulator (5V±1.5% stability), and (3) LM339 comparator-driven cutoff (>5.1V, ...
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Research Article
GoSafe: A Dual-Purpose Modular IoMT Device for Individuals with Visual Impairments
Issue:
Volume 13, Issue 6, December 2025
Pages:
255-266
Received:
30 October 2025
Accepted:
13 November 2025
Published:
9 December 2025
Abstract: GoSafe is an innovative Internet of Medical Things (IoMT) device designed to improve safety, mobility, and health monitoring for individuals with visual impairments. This wearable system incorporates Arduino-based processing, ultrasonic sensors for obstacle detection, and the MAX30102 optical sensor for continuous monitoring of vital signs, including heart rate, oxygen saturation, and skin temperature. Real-time alerts, delivered through vibration and audio feedback, enable users to navigate safely while maintaining health oversight. Health data is seamlessly transmitted via Bluetooth to a mobile application, allowing caregivers to monitor users remotely and receive immediate alerts in case of abnormalities. Performance evaluations demonstrate GoSafe's reliability and precision. Heart rate monitoring showed a negligible deviation of 0.5%, while SPO2 and skin temperature measurements achieved deviation margins of 0.18% and 0.2%, respectively, when compared with medical-grade devices. Testing across multiple participants confirmed its consistent accuracy and robust functionality. With its modular and scalable design, GoSafe is adaptable for future advancements such as GPS integration and machine learning-based analytics. By combining mobility assistance with proactive health management, GoSafe empowers visually impaired users to navigate independently and securely, while ensuring continuous health monitoring. This dual-purpose device is a major advancement in assistive technology, connecting healthcare needs and accessibility in a practical and affordable way that supports the United Nations Sustainable Development Goal (SDG) 3 by ensuring healthy lives and promoting the well-being for individuals with impairments.
Abstract: GoSafe is an innovative Internet of Medical Things (IoMT) device designed to improve safety, mobility, and health monitoring for individuals with visual impairments. This wearable system incorporates Arduino-based processing, ultrasonic sensors for obstacle detection, and the MAX30102 optical sensor for continuous monitoring of vital signs, includi...
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Research Article
Equivalent Analysis of Equipment Sensitivity Thresholds Under Plane Wave Irradiation Conditions in Reverberation Chamber
Issue:
Volume 13, Issue 6, December 2025
Pages:
267-277
Received:
26 September 2025
Accepted:
25 October 2025
Published:
11 December 2025
DOI:
10.11648/j.jeee.20251306.13
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Abstract: Reverberation chamber (RC) is a new testing environment in the field of electromagnetic compatibility measurement. Compared with the traditional testing environments, the RC has obvious advantages in improving testing efficiency and generating high E-field strength with relatively low input power. However, there are inconsistent problems in the test results of the radiation sensitivity threshold of the equipment in the reverberation chamber and the uniform field environment obtained by using the test methods in the current standards. Therefore, studying the equivalence of radiation sensitivity thresholds between the two has become a hot issue at present. Since most frequency-using devices in the electromagnetic environment can be equivalent to an antenna, in this paper, the dipole antenna under the compound field of the boundary deformation reverberation chamber and the uniform field of the anechoic chamber (AC) is taken as the research object to study the equivalence of antenna coupling power under these two conditions. Firstly, the coupling models in the anechoic chamber and reverberation chamber environments were established. The formulas for the antenna coupling power and the spatial radiation field strength under different radiation conditions were derived, and the power correlation coefficients of the two under the same sensitivity threshold were obtained. Subsequently, the electromagnetic environment of the reverberation chamber was constructed by using the Monte Carlo method, and the influence law of random plane waves with different column numbers on the coupling power of the antenna was simulated and analyzed. Finally, the equivalence factor of the coupling power of the two when the threshold of the radiation sensitivity test is the same in the reverberation chamber and the anechoic chamber is obtained.
Abstract: Reverberation chamber (RC) is a new testing environment in the field of electromagnetic compatibility measurement. Compared with the traditional testing environments, the RC has obvious advantages in improving testing efficiency and generating high E-field strength with relatively low input power. However, there are inconsistent problems in the tes...
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,
Md Shawon
