E-Thesis & Research สถาบันเทคโนโลยีไทย-ญี่ปุ่น

fieldjournalid E-Thesis & Research สถาบันเทคโนโลยีไทย-ญี่ปุ่น

วิทยานิพนธ์ (MIT) 2012

1.	THE DESIGN AND IMPLEMENTATION OF AUTOMOTIVE SWITCHING DC -DC POWER CONVERTER WITH NONLINEAR DYNAMICS ANALYSIS AND STABILITY CONTROL [แสดงบทคัดย่อ] [ซ่อนบทคัดย่อ]
	ผู้แต่ง : Nuttawat Suppipat
	DC-DC power converters are important in portable electronic devices such as cellular phones and laptop computers, which are supplied with power from batteries primarily. Such electronic devices often contain several sub-circuits with different voltage level requirements which are different from that supplied by the battery or external supplies and can be either higher or lower than the supply voltage. Additionally, the battery voltage declines as its stored power is drained. Switched DC- DC converters offer an operation to increase or decrease the voltage levels without multiple batteries in order to accomplish the DC operation. The operating DC voltage of most electronic devices in electric cars is commonly lower than the power supply resources. The Buck DC-DC Converter is a suitable solution for this system. However, the output voltage generally contains a small ripple, which is an AC variation over the DC output. As a result, the accuracy of Buck DC-DC Converter may not high as required in the specification. Therefore, the Buck DC-DC converter to be studied in this thesis will focus on the reduction of ripple voltages in order to sustain the system stability with low-cost implementation. This thesis therefore aims to study power conversion theories in automotive electric systems, and also study circuit topologies and operations of automotive DC-DC buck converters. In addition, low-cost high-stability automotive 42V-14V DC-DC buck converters are also designed and implemen Full Text : Download!

2.	THE DEVELOPMENT OF CHAOTIC OSCILLATOR AND ITS APPLICATION TO SYNCHRONIZATION IN CHAOTIC – MASKING SECURE COMMUNICATION [แสดงบทคัดย่อ] [ซ่อนบทคัดย่อ]
	ผู้แต่ง : Sura Larptawee
	This thesis focuses on three chaotic systems is Rössler attractor using Diode Equation, chaotic jerk attractor and a back-to-back twisted chaotic jerk attractor using Inherent hyperbolic sine function for application to secure communications. Dynamical properties are described base including equilibrium, eigenvalue, Poincare, frequency spectrum, bifurcation, chaotic attractor and chaotic synchronization. This chapter focuses on design of chaotic oscillator and signal masking circuit using Matlab-Simulink for simulation and implement chaotic circuit for secure communication We can design and implement circuit chaotic oscillator circuit for chaotic masking communication. Be found circuit form Rössler attractor using Diode Equation and a back-to-back twisted chaotic jerk attractor using Inherent hyperbolic sine function are low cost circuit and high stability circuit. Full Text : Download!

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