Pusat Pengajian Kejuruteraaan Elektrik dan Elektronik - Tesis

Browse

Recent Submissions

Now showing 1 - 5 of 498
  • Thumbnail Image
    Publication
    Attitude Determination System For Nano Satellite Using Extended Kalman Filter On Arm7tdmi Platform
    (2014-09)
    Keui, Adam Ain Mohd Poin
    Extended kalman filter (ekf) has been successfully utilized in satellites missions. However, in comparison to other attitude determination methods developed, it is one of the most computationally burdening algorithm and with the new development of using nano satellites which have limited electrical power, mass, space and usually budget, it is essential to design an attitude determination system (ads) which conforms to this limitation. Therefore, in this thesis, as a computational improvement on the innosat project, the rcm3400 microcontroller of the ads is replaced with the arm7tdmi based microprocessor to test its capability. The arm7tdmi has been chosen since it is one of the well-known microprocessor used in various electronic equipment because it is low power and robust. The embest s3cev40 development board used, houses the s3c44b0x microprocessor which is an arm7tdmi microprocessor. The testing is done by connecting the development board to a personal computer which has been installed with the arm interface software based on visual basic 6.0.
  • Thumbnail Image
    Publication
    Transistor Level Implementation Of Led Driver For Solid State Lighting
    (2014-07)
    Abdul Aziz, Siti Rohaya
    This thesis presents the transistor level implementation of led driver for solid state lighting (ssl). Ssl refers to a type of lighting that uses semiconductor light emitting diodes, organic light emitting diodes (oled), or polymer light emitting diodes (pled) as sources of illumination. Led driver is an electrical device that provides required led voltage and regulates the constant amount of power to the needs of led or string of led. A buck converter is one type of dc- dc converter that can step down the dc input voltage to the required led voltage. In the high input voltage application of the rectified 220-240v ac, the modified buck converter technique has been applied instead standard buck that requires complicated design of bootsrap mode. The development of discrete led driver prototype is to prove the buck converter operation. This circuit design has been integrated with the led driver integrated circuit (ic) to provide a constant current output to the leds with the intention to decrease the size, weight and cost. The design of led driver ic is started with the behavioral modeling technique for proposed control circuit with integrated power switch, dmos. The obtained parameters from behavioral model have been implemented in the transistor level design using x-fab xdm10 1.0pm 350v process technology. In this project, leds string will be driven as much as 20 with the total forward voltage are 50-60v and the current is 350ma.
  • Thumbnail Image
    Publication
    Power Management System For Water Quality Monitoring System In Aquaculture Application
    (2014-09)
    Malik, Azman Ab
    This project proposes a Power Management System (PMS) for water quality monitoring systems in aquaculture applications. The proposed system requires power supply 12V, 200mAh with five sensors, which are ammonium sensor, temperature sensor, water level sensor, dissolve oxygen sensor and pH sensor. The proposed system use lithium ion battery due to its smaller size, lighter, longer life span and stable output voltage. Nowadays lithium ion battery charger is only available for batteries that are arranged in parallel. Hence it is suitable only for 3 V application. However for 12 V system, the voltage have to step up from 3 V to 12V, and it will cause power losses during the step up process. Therefore a charger in series configuration is studied in this project. Four models are developed and studied which are; 1) batteries are arranged in parallel and solar energy is used to charge the battery. 2) batteries are arranged in series and solar energy is used to charged the battery, 3) solar power and batteries that are arranged in parallel are used to supply power for the system, 4) solar power and batteries that are arranged in series are used to supply power for the system. carried out by using the same load. Results show that the second model improves by 173% of discharging rate compared to model 1. Compared with the model 1 and model 2, the model 3 improves by 193% and 7% respectively for the total discharging rate. For the model 4, the discharging rate is better 406%, 85% and 73% compared to model 1, model 2 and model 3 respectively. Results also shows that by using LM2577 as a charger in model 2 and model 4 it xviii Experiments to get charging rate and discharging rate to supply power for the system are
  • Thumbnail Image
    Publication
    Dispersion Of Iron Oxide Nanoparticles On Oxide Nanotube For Nanocatalyst System
    (2014-06)
    Anwar, Dede Miftahul
    TiO2 nanotube arrays (TNTs) and ZrO2 nanotube arrays (ZNTs) were NH4F at 60 V for 30 min. For the formation of nanotubes; oxidation and dissolution have been identified as two most important processes. The dissolution process occurs at the surface of the oxide, inside the pores and in between pores. Comparing TNT and ZNT; it appears ZNTs are longer with smaller diameter and thinner wall compared to TNT. Even though the anodic layer on Zr has higher value of polarization resistance (~3.92 kQ) than TNTs (-7.82 kQ) the dissolution rate of Z1O2 is lower (0.11 mm/year) compared to TNTs (0.416 mm/year), making TNTs are shorter. The dissolution rate of oxide on Ti and Zr is also different resulting in different dimensions. Photocurrent and charge distribution measurement exhibited excellent ability of photogenerated free charge-carriers flow in TNTs but low for ZNTs. Therefore TNTs was need as a cathode to electrodeposit iron oxide. The formation of TNTs was further studied by the use of was suitable to be used as a template for the electrodeposition of iron oxide. For the electrodeposition lectrolyte consisting of 0.02 M FeCh bFhO + DI water was used. Parameters studied for this process included voltage, concentration of electrolyte and the effect of additives in the electrolyte.
  • Thumbnail Image
    Publication
    Impact Of Differential Pair Routing Discontinuities On Signal Integrity In Printed Circuit Board Design
    (2013-02)
    Adanan, Omar Mukhtar
    Differential pair routing on Printed Circuit Board (PCB) is widely used as interconnect due to its excellent signal integrity performance, However, differential pair is not immune to the impact of routing discontinuities. This research analyzed and quantified the impact several types of routing discontinuities on differential pair. These routing discontinuities are routing over split plane, routing over void, 45° bend routing and serpentine routing. The results of this research are based on Full-wave 3D modeling and simulation. The cross-sectional differential pair configuration parameters are based on SATA 3rd Generation industrial standard. Four types of analysis have been done for each of the routing discontinuities, which are S-parameter, TDR, Model Eye-Diagram and Full Channel Transient Analysis. Based on configuration parameters used in this research, the differential pair routing with routing discontinuities degrade the signal integrity performance especially above 3GHz. Routing discontinuities also cause the characteristic impedance of differential routing to change and lead to impedance mismatch. Different types of routing discontinuities have different impact characteristics. As for routing over split plane and void, the higher the number of split planes or voids higher the degradation in signal integrity. As for serpentine and 45° degree bend, inconsistence spacing within differential pair traces causes the signal integrity performance to degrade. x