Gabriel Chindris

• PhD
• Technical University of Cluj-Napoca

Abstract—The present paper introduces a couple of methods of simulating Lead-Acid battery pack in the field of vehicle electrification, referring to a funicular. Often, the traction of the funicular is based on an internal combustion diesel engine. In this paper the diesel engine will operate in a hybrid configuration using an electric machine in o...

The present paper introduces a new concept in the field of vehicle electrification, referring not to a cargo or passenger one but to a funicular. The latter’s operation is normally based on an internal combustion diesel engine. In order to align such an application with the current trends in field of electrification, a project was developed to deve...

It is not easy to debug real-time operating systems or communication interfaces on embedded systems. In the case of operating systems, the tasks will interact and compete for shared resources, resulting in changes in software behavior that are not visible from the source code. When it comes to protocol or interface debugging, alternatively, losing...

Heat transfer from a component to the ambient can be optimized, primarily by reducing the thermal resistance from the main source of heat to the ambient. At package level, reducing thermal resistance can be achieved through adding embedded thermal pads into the package, increasing the number of vias in the package's substrate, and using materials w...

Power dissipation for processors used in personal computers evolved along the evolution of processor capabilities. Datasheets normally contain the thermal design power (TDP), which is the maximum amount of heat generated by the CPU, which the cooling system in a computer is required to dissipate. The current research above aims to bring a decrease...

Thermal management for modern electronic systems can follow two fundamental paths: one concentrates design efforts towards low power/high efficiency electronic circuits/components, the other implies, where the previous one reaches its limits, optimizing thermal transfer in the entire system at chip level, package level, and PCB/assembly level. Thus...

This paper aims to present a mathematical analysis method for resonant power converter, in order to control the transfer of power which is transmitted to the load. Starting from the idea that most switching power converters are using the pulse width modulation (PWM) technique to control the switching elements, the paper presents an analysis of the...

The paper presents a mathematical model for a quasi-resonant converter. This type of converter was analyzed for an induction heating system. The system can have a series or a parallel resonant circuit as a load. In this paper we discussed only series resonant circuit load case.

The paper proposes an alternative way of measuring the current of an application using an linear actuator. The goal is to stop the application's supply when the current's value will reach a pre determined value. Using the supply's voltage variations it's quite tricky due to the need of knowing the exact value of voltage variation linked to the curr...

The following paper aims to design a pointing device for the PC, which not only has the basic characteristics of a standard mouse, but also replicates the role of the numeric pad and all the functions of a normal remote control for multimedia applications. The device presented aims to give back laptop computers all the functionalities that have bee...

The advent of portable devices has a significant impact on the manufacturing industry. Remote programming, monitoring, diagnosis, debugging and configuration are now possible by using off-the-shelf PDAs or cellular phones. In a similar manner, education for certain fields of electronics will have to also move forward, to embrace new technologies no...

The analog noise produced by semiconductor junctions is considered to be the fundamentally unpredictable sum of astronomical numbers of independent quantum actions. In this way, the unpredictability part of this makes noise attractive for cryptography. On the other hand, real noise often exhibits measurable and predictable correlations which contra...

Nowadays PWM control circuits are usually embedded into a microprocessor or a system-on-chip core. The real improvement for such implementation should come not only from more precise PWM generation or from more complicated control loop algorithms, but also from new added functionalities like: power quality monitoring, new failure and security proce...

Automated optical inspection (AOI) of assembled PCB's is one of the most widely spread non-destructive testing method used in mass-production of electronic systems. Some great advantages of the AOI mechanism is the fact it is a non-contact test method and the AOI inspection is much more reliable and repeatable than manual visual inspection. Fast vi...

The paper presents different ways of transmitting biomedical signals, depending on the transmissionpsilas range. Thus, the new wireless technologies, combined with the data transmission within a local area network (LAN) or the internet, will contribute to a better health-care system developing.

The intent of this presentation is to present the influence of power level delivered on a load over the total harmonic distorsion of input current for a power half-bridge inverter with resonant load. Half-bridge inverter is a configuration used for higher output power applications compared to single end quasi-resonant inverter. Even though it needs...

In the development of embedded software one of the harder tasks are testing and optimize the ECUs. The basic way to test and optimize is by measuring and calibrating the process. One of the common methods to solve this problem is dasiaHardware-in-the-Looppsila(HIL). With this method, the real ECU is place in a simulative environment for the softwar...

Security-critical applications require "random " numbers for generating cryptographic keys. It is widely known that generating true random numbers will have to address physical phenomena with random proprieties: quantum mechanics or thermal phenomena in electronic devices. More than that, harvesting high-entropy data from hardware generators is usu...

Harvesting high-entropy data from hardware generators is usually a difficult task and most of the applications will take data that is believed to contain enough entropy and use it to ldquoseedrdquo a cryptographic algorithm. The paper proposes an evaluation of such system on chip device designed to harvest high-entropy data from thermal phenomena (...

Nowadays, PWM control circuits are usually embedded into a microprocessor or a system-on-chip core. It is up to designer's choice to evaluate precisely the quantity of resources required for such an implementation and how much the control function and/or the power topology influence this decision. The paper proposes a method of evaluation for resou...

Many automotive sensors have as output a square wave signal, whose frequency is related which measurement parameters. Such sensors are use for measuring the shafts rotation and wheels rotation. The measurement systems are developed basically based on a microcontroller, which timers capture feature is used for frequency measurement. The frequency me...

Automated optical inspection (AOI) of assembled PCB's is one of the most widely spread non-destructive testing method used in mass-production of electronic systems. Fast video processing algorithms and precise mechanical systems are supporting this cost-effective method for investigating electronics assemblies. However, for small production quantit...

Nowadays design of embedded systems for controlling industrial processes requires higher and higher integration of analog and digital features. In this way, the system-on-chip approach for designing such embedded systems seems to be the most competitive solution in terms of cost-effectiveness and performance (Chindris, 2002 and Pop and Chindris, 20...

Advances in microelectronics and microprocessors in the last decade have revolutionized the electronics industry , making feasible the realization of sophisticated, "smart"and yet inexpensive, processing and control subsystems. The advantages of discrete controllers are two fold: being of digital nature they are less dependent on the accuracy and s...

The more and more increased complexity of the modern VLSI chips, along with the integration of analogue and digital parts in the same chip, implies a proportionally equivalent rise of the costs involved in design for testability. The paper presents a new method for designing test procedures inside system-on-chip cores aiming to reduce the related c...

This paper presents a model of a claw-pole alternator with its rectifier bridge based on the simulation tool Microsim-PSpice. Different control strategies for increasing the alternator's output power are implemented in this model and the simulation results are discussed. The performance of the whole system, alternator and rectifier bridge, is compa...

The new higher learning educational system proposed for east-European countries is divided in three main stages: bachelor, master and doctoral degrees. This system demands a new approach which must take into consideration the common ground of different higher learning systems, the specific characteristics of pre-university learning system and the l...

This paper presents theoretical and experimental aspects related to the implementation of a DSP-based fully digital single phase true sine PWM inverter. The proposed digitally-controlled PWM inverter employs a single chip DSP to realize a double-loop voltage and current mode control scheme. The Motorola DSP56F80× family is well-suited for digital i...

This paper presents an educational platform for modeling of basic zero-voltage switching quasi-resonant boost converters using mathematical methods. In order to visualize the results of solving the equations that describe the converter operation, we used Matlab software modules. The advantages of this method of study are: (1) wider availability - i...

Powerline carrier (PLC) is a popular communication technique that uses the existing power wiring (120 V, 240 V, etc) to carry information. It is a kind of "wireless" means of communication, because technology can supersede the installation of dedicated wiring in some applications. Although the powerline environment is a hard environment for any com...

Due to the present continuous development of more and more power efficient electronic devices, a comprehensive analysis of the power quality within an energy distribution area is a difficult task. Since filtering and compensation devices for power factor are no longer a solution, the continuous monitoring and control of power quality for each devic...

The new higher learning educational system in Romanian Universities divided into three main stages of bachelor, master and doctoral degrees demands a new approach which must take into consideration the common ground of different higher learning systems, the specific characteristics of the pre-university learning system and the local particularities...

The new solutions on microcontrollers and DSP facilitates the transition from widely-used mechanical meters that yield limited data, to electronic meters that provide extensive information on customer energy usage. In the face of electric industry deregulation and the need for continuous improvement in customer service, the new electronic meters pr...

The μBGA soldering process is usually performed in special soldering equipment, under extreme conditions of humidity and temperature. The re-working process of such devices is not recommended due to the complex equipment needed for de-soldering and re-soldering of μBGA capsules. However, the rapid prototyping process of electronic modules sometimes...

The system-on-chip devices represent the future of embedded design due to their specific features: integration of analogue and digital blocks along with an 8-bit or 16-bit microcontroller core. By using of such devices, the designer is not allowed to configure an entire acquisition system inside on chip (including filters, ADC's, UART's and user in...

The automotive industry community as a low-cost network complementing the existing automotive multiplex network has established the LIN standard. The LIN network, consisting in a single wire (up to 40m), single-master, multiple-slaves and speed up to 19.2Kbps represents an efficient alternative for integrating sensors in a low-cost bus architecture...

It has often proven difficult to simulate microwave and RF circuits accurately. This paper presents an easy method for modeling and simulation of nonlinear active microwave circuits using the Ansoft Serenade 8.0 Design Environment. Starting with some simple circuits (MESFET mixer circuits, GaAs BJT feedback microwave amplifier), the authors describ...

The common PSPICE model for the power MOSFET device is well known to CAD designers. This paper addresses the problem of how to correctly simulate a nonlinear device by modeling the nonlinear components of its PSPICE model: drain-to-source resistance vs. temperature, drain-to-source and gate-to-source capacitance vs. voltage. By comparing the simula...

This paper presents a new topology for a SEPIC converter used in power factor correction circuits. The conventional SEPIC converter was primarily designed to provide a nonpulsating input current, operating with both inductors in continuous current mode and only DC-DC conversion was considered. The modified SEPIC converter is designed to operate as...

Designing in a network environment is the most effective way to obtain the best results, but this design method is often difficult to organize when taking into account the network management problems imposed by the CAD environment used. This paper presents a new solution for implementing a network methodology for working with OrCAD in a multi-layer...

Nowadays electronics designs implies more and more elaborated solutions for power supplying circuits due to the increasing demands of designers: multiple voltages output, low EMI, increased thermal efficiency, etc. For current designs, multiple voltages output usually means multiple PWM controllers, enlarged PCB area and a complicated custom design...

Over recent years, switched mode power supplies and similar switched electronic load controllers have become major sources of deterioration of the electromagnetic environment. The demand within the electronics industry for power supplies that are physically small, perform efficiently and with stability over a "worldwide" range of input voltages and...

This paper presents theoretical and experimental aspects of the methodology for embedded sensor design with PSoC controllers for measuring the pressure and temperature using two NPN transistors, enlightening the benefits of the method: a PSoC design reduces the time-to-market, increase flexibility, lower part count, provides in-system performance i...