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The following topics are dealt with: analog to digital conversion; wireless sensor networks; power system monitoring; control systems; image processing and recognition; sensors and measurement technologies; and mechatronics automation.
In this paper, a second-order 14 bit 2MSPS sigma-delta ADC used for data acquisition is proposed. The adopted feed-forward structure in SDM has reduced more than 50% output swing of integrator, leading to inherent low power operation compared with the conventional feedback topology. The proposed ADC, designed in TSMC 0.18μm CMOS technology, achieves 83.9dB peak SNR and 91dB SFDR with an over sampling...
This paper presents a design and implementation of a low noise phase-locked loop (PLL) based on ring oscillator to provide timing clocks for the analog-to-digital converter (ADC). The ring oscillator consists of four current control delay cells with current-steering amplifier (CSA) circuit. These fully switching differential delay cells are employed to reduce the phase noise of the ring oscillator...
This paper introduces the machining principles and characteristics of form grinding cylinder gear as well as the composition of the profile shape of a form disc grinding wheel. By using the non -instantaneous section envelope machining principle, a mathematical model of form grinding the in volute surface of the helical cylinder gear is established. And also a calculating formula used to dress the...
This paper introduces the machining principles and characteristics of form grinding cylinder gear as well as the solution process of circular arc and continuous least squares circular arc. after the profile shape of grinding wheel is dispersed into n discrete points using a mathematical model, discrete points are fitted with continuous arc instead of least square circle arc, which solves the smoothing...
Currently, the wireless sensor networks QoS is confronted with many challenges. Wireless sensor networks has many characteristics, such as basing on the data, and facing application and dynamic characteristics. This paper emphatically analyzes the description of wireless sensor networks QoS and its QoS evaluation method. Then quantize the QoS index and Computes QoS indexes weights. Finally, based...
A compression approach of power quality monitoring data based on two-dimension Discrete Cosine Transform (DCT) is presented to deal with huge data about power quality event detection. The monitoring data was truncated and recomposed in multiple cycles to transform the one-dimension data into the two-dimension data, which was a matrix in essence. The matrix was divided into some sub-blocks all of which...
In this paper, a novel hysteresis current control method based on the phase of the output of voltage loop by using a single LEM current sensor is proposed. Because of having two filter inductors, the Dual Buck Half Bridge Inverter has on bridge arm shoot-through problem. Each inductor current can be independently controlled, so the power switches and the free wheeling diodes can be optimally chosen,...
An automatic registration algorithm for the scattered point clouds is proposed in this paper. The curvature of each point is estimated by using the quadratic surface fitting method. And then, according to the change of curvature the feature points that have the maximum local changes are extracted. The initial match points are acquired by computing the Hausdorff distance of curvature, and the feature...
The key idea of the lifting scheme is constructed wavelet filters by several predict operators and update operators. We know that the poly-phase matrix can be factored into finite matrixes, and these matrixes can be regarded as the predict operators and update operators. According to the theory of M-channels wavelet transform, the construction of the M-channels wavelet filters based on the lifting...
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