Applied Mechanics and Materials Vols. 462-463

Abstract: To provide DC power to auxiliary equipment for a certain type of aircraft, according to the actual need, small power two-way dc power supply is designed using current mode pulse width modulator UCC2800. This paper introduces the basic principle of UCC2800, and also introduces the design and realization process of the low-power dc power supply based on UCC2800.

Abstract: This paper mentioned the design of an isolated feedback generator with SOI process. This generator adopts 40V SOI technology and it integrates reference, high frequency oscillator, error amplifier and modulator, meanwhile this generator predigests the mission of designing for the closed loop feedback of the switching power supply which types are the isolated and primary controlled. Along with the developing of the power conversion, this circuit is specially designed for high reliability, high capability and anti-radicalization applications.

Abstract: There are many traditional methods to detect the weak signal(such as, locking -receive, synchronous cumulative and double channel de-noising) When the signal is very weak which easily submerged by the device noise,the error that measured by the above methods is too big. This paper mainly introduces the principle of a adaptive control faint signal cycle amplifier and through the method of error compensation to amplify signal cycled , which improve the signal-to-noise ratio and reduce the detection error. The structure of this system is simple and it cost low. besides,it convenient for use and debug. The circuit can also be applied to data acquisition and processing of weak signal and its significance is very widely .This paper designs a simulation circuit and analyzes sample-hold and analog switch.

Abstract: The microstrip circuits are analyzed using the Gaussian Green’s function method (GGF) together with network analysis method. The main advantage of the GGF lies in its precision as well as rapid convergence. The multiport network analysis of microstrip circuits can effectively reduce the complexity of the modeling. A novel method is derived by combining of the multiport network analysis and GGF. To demonstrate the versatility of this method, the current distribution of two microstrip filter circuits is achieved by this method. The results are compared with the results of the commercial full-wave software of Ansoft Designer. It is shown that this method is much more accurate and valid.

Abstract: In this paper, a long-distance optical communication system based on Embedded ARM platform is presented and demonstrated. The system is composed of two parts: LED/PD application terminal and its drive circuit. Terminal has a 4-inch touch screen with interactive interface based on Android system. The performance of data transfer in our prototype shows up to 50 m range at the transmission rate of 50kbps. This system is supposed to reach the distance of 2km or higher in the coming months.

Abstract: Wireless video collection and transmission system has been widely used in many remote video monitoring system and portable equipment. This system was to use S3C2440 as the main control chip, through the Z301P for camera collection video, and through the wireless network card RT3070 chips for video wireless transmission. We uploaded collected video to Mozilla Firefox, and then wireless network video collection and transmission system was built quickly.

Abstract: At present, with the rapid development of digital audio technology, high speed and high performance digital audio processing technology faces an important issue. This paper proposes and designs a digital audio player combined with digital audio and embedded systems two cutting-edge technology. Hardware circuitry takes STM32F103VE as the main controller, configurated with VS1003 audio decoder chip and the corresponding SD card storage module, LCD module, power supply module and so on; software design transplants embedded operating system μC / OS. This paper takes advantage of μC/GUI to design audio player graphical user interface, improves the human-machine interface friendliness and aesthetics greatly.

Abstract: With the continuous improvement of the complexity of the microelectronic system, its reliability risk is becoming more and more obvious. In order to improve the reliability of electronic systems in complex electromagnetic environment, this paper proposes a new fault self-repairing method; the idea is to realize controllable silicon evolution on the FPGA. A MicroBlaze CPU and VRC array are designed, and the CPU runs the evolutionary algorithm to configure the VRC array, dynamically changing the structure and function of the circuit, so as to obtain high reliability of the digital fault self-repairing circuit. Evolving fault self-repairing technology provides a new way for the high reliability of the digital system design.

Abstract: Aimed at the high starting current, low power factor and low running efficiency, a novel soft starter with current-limiting, reactive power compensation and harmonic filtering is developed in this paper. The following works have been done in the study: the research of topological structure, the design of hardware and software of the control system, the validation of experimental result. It has been successfully applied to the fans load of 10kV, 19000kW, and got better effects, and satisfies the characteristics of the current-limiting and reactive compensation during this motor starting. It can also realize the power harmonic filtering after the motor soft starting, improve the whole starting performance, save energy and keep the grid voltage stable, with easy engineering implementation and high cost performance.

Abstract: According to faulty phase selection demand in the computer protection, DSP and AD7656 are used to make the voltage and current sampling, and make the data processing, select the faulty phase by symmetrical components selection method. The hardware and software design of the faulty phase selection device is provided. The overall hardware program and key design is given in this paper, meanwhile the software flow chart is given and the key algorithm is analyzed and interpreted.