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The problem of protecting the power supply of separate units of a mobile robot is quite similar to the problems of protecting the electrical mains. In one case we have to re-distribute the electrical energy due to lack of stability in its consumption, in another case we have to re-distribute the energy due to uneven load on separate units of mobile robots. It is impossible to predict, when this load...
A multiphase all-digital delay-locked loop (DLL) with reuse SAR has been designed with TSMC 0.18μm CMOS technology. The proposed reuse successive approximation register (Reuse SAR) reduces the hardware cost effectively as compared with a conventional SAR or a two-stage SAR. The digital to voltage convertor has six coarse controlled bits and six fine controlled bits to adjust voltage for voltage controlled...
Distributed Generation (DG) sources have attracted serious attention due to their potential solution for some issues, like the deregulation in power system, increasing the power consumption and the shortage of transmission capacities. The optimal placement of DG is necessary for maximizing the DG potential benefits in power system such as maintaining and/or improving reliability and stability. There...
From depletion of energy resources and consideration to natural environment, introduction of renewable energy facilities has been increasing annually. Moreover, introduction of photovoltaics has increased on the demand side. However, due to the fluctuating power from renewable energy sources, frequency and voltage fluctuations of power systems become problematic. At the same time, there has been a...
Permanent magnet generators used in hybrid vehicles primarily provide the equipments in the hybrid cars with the DC power and charge the batteries. The generator rotor is composed of the rotor core and the multi-block Nd-Fe-B permanent magnet fixed on the rotor core. The polar of the adjacent Nd-Fe-B permanent magnet is opposite, in another words, N polarity and S polarity are arrayed alternately...
Wind energy conversion systems have become a focal point in the research of renewable energy sources. Due to rapid advances in the size and power rating of wind generators as well as development of power electronics. These electrical utilities generate and provide energy in AC form. As the wind energy to electrical power conversion is rather expensive we concentrate on efficiency increase inside electrical...
This work presents a new architecture of spread-spectrum clock generator providing 1.5-Gbit/s, 3-Gbit/s and 6-Gibt/s SATA compatible specifications. A two-stage delta-sigma modulator is proposed to simplify the hardware and to overcome the nonlinearity issue of triangular control voltage induced by supply voltage, process and temperature variations. The peak energy of the output clock spectrum is...
This paper describes a new architecture of the spread-spectrum clock generator (SSCG) using direct digital modulation scheme on VCO. Differing from the conventional technique by altering the control voltage of VCO, the modulating operation is performed by the selection of multi-band VCO. The proposed SSCG test chip has been fabricated by CMOS 0.18mum 1P6M process. The operating frequency range is...
The paper presents the design and implementation of input/output interface circuits, fully compatible with low-voltage differential signal (LVDS) standard. Due to the low voltage differential transmission technique, the low power consumption and high transmission speed are achieved at the same time. The transmitter is implemented by a closed-loop control circuit and an internal bandgap voltage reference,...
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