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In the last time, the power supplies issues of electronic circuits had become an important issues, especially for mobile devices. The use of classical or Li-ion batteries in the industry, mainly utilized in storage systems, is not a viable solution because these devices, after 2–3 years, lose their ability to store electricity and the materials employed are polluting, even banned in some countries...
Electric Double Layer Capacitors (EDLCs) are relatively new electronic components developed in the late 1980s; their operation is based on a Helmholtz double layer of charge formed on an activated carbon surface (of high equivalent surface) and an electrolyte. The advantages of this constructive solution are a very small capacitive distance and large effective capacitive area, leading to remarkably...
One of the challenges of designing LED lighting systems is to ensure proper thermal management. It is known that during nonradiative combination phenomena[1–3] heat is generated in the active region of the LED but due to the high thermal resistance between this region and air much of the heat is conducted to the substrate. The problem is not that heat is generated but that it is not removed as fast...
The paper presents an improved method to detect tamper intrusions based on an active circuit. It is composed of a logical part, a microcontroller, capable of generating pulses that follow the rule of a linear-feedback shift register (LFSR), and an analogical part made of a mesh network, used to cover secure modules, and a pulse forming circuit. Pulses resulted from this forming circuit are analyzed...
With increasing use of LEDs as light sources for street lighting and traffic lights, snow and ice deposits on the external lens proved to be a problem since LED do not dissipate as much heat as incandescent lamps. There are solutions that address this problem based on thermistors or using dual mode heat transfer loops. This paper presents a traffic light model that uses a Peltier module to heat the...
The supercapacitor is a relatively young electronic component which bases its operation on the principle of the Helmholtz double layer of charge formed on the surface of an activated carbon (with an extremely high equivalent surface) and an electrolyte which allows both a short distance between the electric layers as well as a very large useful area. For optimal use of an EDLC (Electrochemical Double...
Although only at the stage of proof of concept, a basic approach in Occam technology is: placement of components on a dielectric substrate, encapsulation, reversal of the substrate, drilling down to pins of components, creation of conductive traces, a.s.o. Since a reversed order of construction of a simple circuit is considered to be much cheaper in terms of required equipment, this paper presents...
One of the major problems encountered in the use of high power LEDs is that they are not 100% efficient because much of the power consumed is converted into heat that requires additional costs to be evacuated. This paper investigates a method to supply the LED that tries to keep the LED junction temperature close to the ambient temperature. A comparison has been made between a LED supplied on DC “constant-current”...
The Electronic Innovation Cluster was founded in 2011 as a result of the already existing economic relations between Center of Technological Electronics and Interconnection Techniques from the Politehnica University of Bucharest and several SMEs from the Bucharest-Ilfov region of Romania. Following the cluster concept of triple helix introduced by Prof. Michael Porter, ELINCLUS has now 48 members,...
One of the consequences of the continuously increasing complexity of electronic circuits, as well as of the multitude of requirements that the electronic module must satisfy, is the fact that the interconnection structure, the base for connecting electronic components, has become a critical factor in ensuring the competitiveness of the companies involved in the electronics industry. Moreover, as a...
This paper presents results obtained by simulating the electromagnetic field generated by an inductive planar structure with different parameters using FR4 substrate. The characterization/simulations of these passive devices were conducted using finite element software named Ansys HFSS. The key modeling considerations taken into account are: ground return path, skin depth, and dielectric stack-up...
This paper continues the study in the field of microheaters on flexible substrates. The idea of using flexible substrates comes together with the need for low manufacturing costs, having in mind the applications of sensors for home usage and other possible applications as monitors for buildings or basements where possible toxic gases can be accumulated, for instance mathane, carbon monoxide or carbon...
Organic thin film transistors (OTFTs) are of significant interest for the development of organic electronics. The devices described in this paper, through measurements, analytic extraction of parameters and simulations, are organic transistor having Polytriarylamine (PTAA) as semiconductor. This paper refers to the determination of the source and drain contact resistance of these PTAA organic transistors...
The following paper is a study on an electrical system which is using a Electrochemical Double-Layer Capacitor (EDLC) battery pack and an electronic system with minimal electromagnetic interference for use in automotive applications. The design of the electronic control module incorporated into the system, which represents an original solution for assuring minimal conducted and radiated electromagnetic...
The emerging of printed and organic electronics has been proven as a major trend in the last years. The only major commercial issue is represented by the organic light emitting diodes (OLED). In the current paper will be shown the results of electrical investigations of organic resistors based on poly(3,4-ethylenedioxythiophene) doped with polystyrenesulfonic acid (PEDOT:PSS). The influence of the...
The paper aims to describe methods of dealing with printing issues related to printing metallic nanoparticle inks with micrometric dimensions. The particular focus is on inks containing metal nanoparticles, complexes and metallo-organic compounds that reach acceptable conductivity for the structures. These need to be sintered, the low temperature representing the novel aspect. The work describes the...
The paper presents the result of studies and investigations related to planar thermoelectric generators, intended to be realized through printing technologies. The recent development in printing technologies and materials makes possible the realization of thermoelectric pairs in planar configuration as an alternative to the already used devices. The use of printing technologies permits the realization...
We aim to evaluate the performance of a ZigBee wireless sensor network using OPNET. The network is intended for a general application and should be able to collect data from many nodes, every node connected to several sensors. One possible application for such a network is in the medical area. At first the network will be used to display the evolution of blood pressure; the body temperature, the ambient...
Accumulators used in electric vehicles being in production to date have the disadvantage of a limited number of charge-discharge cycles (lead-acid accumulators) or high acquisition price (NiMH, Li-Ion) and long full recharge duration. This paper presents a study on a solution to increase the life cycle of a typical battery pack used in automotive applications by recovering the deceleration energy...
The present paper is the result of studies, experiments, modeling and simulation regarding electromagnetic compatibility (EMC) of an electronic module able to control and vary the power requirements of a Vapor Phase Soldering (VPS) machine in order to obtain the desired thermal profile. The original electronic solution has been designed to obtain very low radiated electromagnetic emission during operation...
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