Advanced Materials Research Vols. 1030-1032

Abstract: This paper presents a new hysteresis current control method for APF(active power filter) that can reduce switching losses effectively by means of adjusting the hysteresis band width according to the current size. On one hand, this method adjust the overall hysteresis band width according to the size of absolute norm of three-phase current that optimize the overall switching frequency, reduce the total switching losses effectively. On the other hand, it adjust hysteresis band width of each phase by comparing the output reference current to reduce the switching times which switching losses is larger, while increasing the switching frequency which switching losses is smaller, so as to maintain overall control precision. Computer simulation is conducted on an electromagnetic transient program. The results show that the new method can effectively reduce the switching losses under the same control accuracy and total switching frequency.

Abstract: A simulation model about photovoltaic array which can track the maximum power point with the function of changing the it's resistances' structure is developed based on PSCAD. By the simulation of connecting the model with a associated electro circuit, we can draw the conclusion that the model can almost review the character of the actual device. Key worlds: photovoltaic array; MPPT; PSCAD; simulation

Abstract: Single-chip microcomputer MSP430F44 is the core control chip of the multifunction TIG welding controller, MCU is produced by TI and 16-bit flash type, the chip control system uses C430 language to modular software programming, coordination with other subroutines by the main program module , through a simple interface conditioning circuitry on a TIG welder can achieve a variety of welding processes, the welding flexible demand is satisfied. One of the most important module of the welding current waveform generator module, the welding waveform parameters are automatically generated by two way, one is the welding methods, the other is the welding parameters, then judge the input signal of the welding gun, when the gun is pressed, the corresponding waveform output; the welding current waveform output can be achieved using this software, is displayed on the welding current waveform generator.

Abstract: ] This paper introduces the composition of a boiler steam drum control system. It uses the application of a programmable PLC control unit for the boiler steam drum control system. By relying on MCGS configuration software, real-time automatic monitoring was accomplished.

Abstract: According to such problems as the electricity metering seal’s pry-prevention and falsification-prevention performance is relatively weak, whose management technology is also relatively out of date, this paper has designed a much more security electricity metering seal application system based on the cryptographic technology and RFID technology. This system not only can realize the real-time monitor and manage to the electricity metering device and seal but also can ensure electricity metering seal’s falsification-prevention performance, key data’s integrity and confidentiality by leading-in advanced data cryptographic technology and adding security encryption device. It has great practical value.

Abstract: With the application of mobile robot in the industry, put forward higher requirements to the computer remote control technology. Remote control for mobile robots, the communication protocol between the host computer and the robot body and the control command design is presented in this paper. Visual C++ 6 programming language is used to complete the system. Dependability and practicability of system are proved by test.

Abstract: The application of computer remote control technology become the future trend of the development of enterprises. In this paper, the use of international popular client / server structure and the socket and multi thread network data communication based on Visual C++ 6 programming language complete the system design, realizing the remote client to control the mobile robot.

Abstract: DC motor control system is an important portion of NC flame cutter height automatic adjustment device. The article made the program of DC motor control system in height automatic adjustment device, and designed the PWM DC motor control circuits. Pointed out the key problem of the system software and solved it.

Abstract: This paper introduces the entire elevator controller making process based on the programmable chip EP2C8T144C8 through two softwares of QuartuesII and Altium Designer. It is different from the previous designs for the clocks of each part in this elevator controller all come from divisions of frequency of crystal oscillator, so that could be fully used. In addition, there is a lattice of 5×7 to achieve the state display. If the lattice makes the display run at 24 frames per-second, the human eye can catch it as a continuous image.Keywords: EP2C8T144C8, elevator controller, crystal oscillator , display lattice

Abstract: With the production line testing requirement of the micro-motor rotor which is less than 10mm in diameter, an improved rotor detection method based on the pulse test method was presented for the rotor fault detection. This paper analyzed the operating principle of the method and simulated on the Matlab platform. Moreover, the rotor detection system centered on the DSP processor was designed to detect the rotor fault. The result showed that the method could quickly and accurately detect the inter-turn short circuit fault and determine the deep of short circuit. The degree of detection is up to 4% level, which meets the actual production testing requirement.