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Dynamic adaptation of power emissivity for mobile microstrip antennas in a variable impedance environment with microcontroller 26

Dynamic adaptation of power emissivity for mobile microstrip...

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IEEE 26th International Symposium for Design and Technology in Electronic Packaging (SIITME)

作者： Baicu, L. Dumitrascu, B. Culea, M. Nistor, N. Dunarea de Jos Univ Galati Dept Elect & Telecommun Galati Romania Dunarea de Jos Univ Galati Dept Comp Sci & Informat Technol Galati Romania

ISBN: (纸本)9781728175065

In this paper a qualitative and quantitative study of emissivity control for micro-strip type microwave antennas using adaptive correction of the transmission power when the wave impedance of the propagation medium is not constant and it is influenced by nearby moving conductive objects or by objects with different reflection or absorption ispresented. We propose a dynamic adaptation module controlled by a microcontroller for the microwave transmission circuit. The microcontroller reads the current variation for a fixed current level of the emitter which contains the information about the propagation efficiency of the electromagnetic wave and generates a RF carrier amplitude control signal. The mathematical model of a micro-strip antenna working in a certain emission band and the dynamic hardware adaptation possibility for the power of the emission so that the medium influence will not affect the minimum useful power needed by the receiver are considered. The main idea is to create an algorithm to reduce the supplemental RF emitter energy consumption working in open waveguide (air or vacuum) and whose antennae are not perfectly adapted or are moving, such as wireless devices or GSM antennae. For these particular cases, the surrounding objects having the physical dimension of the emitting antenna behave like receivers and will absorb totally or partially the energy emitted. The phenomenon considered is the one of reappearing of the reflected waves in the antenna, which will change the antenna circuit similar to a supplemental reactive load in the emitting circuit. The effect in this case is the increase of the absorbed electrical power in the final RF stage. Measuring the current is a challenge because two steps are needed;a pre-scaling and a final scaling using a voltage zoom by temporally modifying the voltage references of the ADC converter. Finally, the solution proposed in this paper consists in the very precise periodic measurement in the final RF circuit by us

关键词： process monitoring micro-strip antenna microcontroller process wave reflexions impedance adapter

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3D tracking system at maximum solar emissivity with microcontroller 26

3D tracking system at maximum solar emissivity with microcon...

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IEEE 26th International Symposium for Design and Technology in Electronic Packaging (SIITME)

作者： Dumitrascu, B. Baicu, L. Florescu, A. Culea Nistor, N. Univ Dunarea de Jos Galati Dept Elect & Telecommun Galati Romania

ISBN: (纸本)9781728175065

In this paper a smart real-time tracking and positioning for a solar cell or solar panel in order to maximize the solar energy recovered from the electromagnetic radiation from the Sun. The idea of the paper is to use a mathematical transform from the Cartesian coordinates to spherical coordinates, with the mechanical part implementation based on two changes (the azimuth change and angular change) using two actuators, made of precision stepper motors. The system will position and correct the positioning of the solar panel by reading in real-time the instantaneous current on a test load (different from the real charging circuit load), the current is digitized using the internal analog to digital convertor of a microcontroller and stored in a memory buffer. The position for the maximum solar electromagnetic radiation that can to reach the solar panel is determined by periodic scanning for the maximum generated current. In order to scan for the maximum current, the solar cell's orientation is changed for the horizontal angle and azimuth. The solar panel will be rotated in small increments a few degrees in both directions and the instantaneous current will be recorded along with the orientation. The rotations will be for the horizontal angle and azimuth (up and down). A two steps algorithm is used to determine each local maximum. The first step determines the average component using the analog to digital convertor with lower resolution. The second step involves a higher resolution search in the vicinity of the maximum from step one. The higher resolution current data will be stored in a memory buffer along with the corresponding horizontal position and azimuth. With the latest current data and the values stored in the memory buffer, the microcontroller will perform corrections to the position of the solar panel.

关键词： Current monitoring microcontroller process energy efficiency optimum position

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Monitoring Current Variation using Pattern Recognition Algorithm Implemented in Automotive DC Driving Servomechanism 25

Monitoring Current Variation using Pattern Recognition Algor...

引用

IEEE 25th International Symposium for Design and Technology in Electronic Packaging (SIITME)

作者： Nistor, N. Baicu, L. Dumitrascu, B. Dunarea de Jos Univ Galati Dept Elect & Telecommun Galati Romania

ISBN: (纸本)9781728133300

In this paper the authors consider the problem monitoring of the drawn current by the main power rail that powers multiple consumers (servomechanisms, actuators, electromagnets, stepper or DC motors) present in cars, in order to protect the equipment present on board a car or to increase the reliability of electromechanical systems. The idea is to scan the supply current of a device connected to the main power rail using a very sensitive shunt and to store this data using a development board with a microcontroller and implementing maps of the currents that will be supplied to specific consumers. The board operates in two stages. The first stage involves memorizing the shape currents and storing the data in a memory zone. The second stage assists the current utilization of the equipment by using a software block to recognize the shape of the current. Recognition of the current shape and classification of the current event into nominal or faulty operation will be done using byte oriented comparisons initially and using a variable error filter afterwards using "running average" which will be presented below. Preliminary results were done on a 16-bit microcontroller.

关键词： Current monitoring running average signal synchronization prototype signal form recognition servomechanism microcontroller process

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