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A new step-up (boost) converter with fast-response and efficiency-enhancement techniques suitable for cluster-based wireless sensor networks is presented in this paper. First, the modified nonoverlapping clock generator can produce four proper switching clocks to prevent four power transistors to be turned on simultaneously. Second, the size of the power transistor is adaptively changed by the width...
A compact charge-pump boost converter with fast transient response and high efficiency is presented in this paper. One inherent advantage of charge-pump boost converter is its fast transient response for load variation, and the other is current stress on the output capacitor of the charge-pump boost converter smaller than conventional boost converter. In order to improve the transient response, hysteretic...
In order to further study the grinding mechanism and to improve the grinding quality of non-circular cams a mathematical heat transfer model for cam grinding was set up based on the heat transfer theory with reasonable assumptions and simplifications on a heavy duty cam grinding. Internal distributions of temperature, stress, and deformation of the cam were achieved from the cam grinding simulation...
Forward speed is an important factor influencing the productivity and quality of combine harvester in work process. Control the forward speed of combine harvester and keep the rotation speed of threshing drum in constant is effective both in improving production efficiency and threshing quality and reducing equipment failure. In this paper, the control method of rotation speed of threshing drum based...
From the point of view of pattern recognition, a new fault location method based on frequency analysis is proposed in this paper. It samples the transient voltages at the sending end and the transient currents flow through the transmission line during the fault at first and analyzes the phase relation between voltage and current at different frequency with fast Fourier transforms (FFT) algorithm....
Medium voltage (MV) power line carrier communication is an economical and practical way for the 10 kV distribution power line. MV carrier communication project based on spread spectrum technology is proposed in this paper. The whole architecture of MV power line carrier communication system is presented in this paper with the emphasis on the design of the power line carrier communication system, as...
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