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As one of the renewable and clean energy resources, wind power is attracting considerable attentions and becoming most developing renewable energy resources due to its large unit capacity, etc. This paper make an basic approach to the construction of offshore wind farm power generation system, which is considered to be a promising way to increase the practical utilization of wind power. In this paper,...
A low-jitter fractional spread-spectrum clock generator (SSCG) by utilizing a fast-settling dual charge-pump (CP) technique has been developed for Serial-ATA (SATA) applications. The proposed fast-settling dual CP technique not only reduced a design area but also shortened settling-time by controlling the CP operation sequence in an SSCG settling period. A multi-modulus divider using differential...
A wavelet generator (WG) based on simple ultra-wideband impulse radio (UWB-IR) architecture has been developed to use for multi-gigabit communications systems that utilize the W-band millimeter wave (75–110 GHz). The W-band WG radiates a pulse signal, or a wavelet, whose full width at half maximum is less than 80 ps, which makes it possible to realize a 12.5-Gb/s ON/OFF keying transmitter. The WG...
Factors of the measurement uncertainty (MU) are analyzed and calculated, to examine a dominant MU factor in the IEC/EMC immunity standard such as IEC61000-4-3,-6 etc., in accordance with ISO guide 17025 describing uncertainty in measurement. It was assumed that the contribution factors to MU are the measurement system repeatability, accuracy of the signal generator, amplifier gain and harmonics, accuracy...
Some system-level electrostatic discharge (ESD) tests repeat badly if different ESD generators are used. For improving repeatability, ESD generator specifications have been changed, and modified generators have been compared in a worldwide round robin test. The test showed up to 1 : 3 variations of failure levels. Multiple parameters that characterize ESD generators have been measured. This paper...
As mechanical vibration usually exists in HV motors and generators, its influence on the partial discharge (PD) needs to be studied so as to improve the reliability of on-line PD monitoring method. In this report, the mechanical vibration frequency was synchronized to the power frequency and the effects of vibration phase were investigated. Because the length of the discharge gap changed with the...
A magnetically insulated diode with a cryogenically refrigerated anode is proposed for the first time and a prototype of such a diode is constructed. H2O ice is produced on an anode which is cooled with liquid nitrogen. A small machine fed with a marx generator and a blumlein line is used to extract ion beams. Proton beams of about 50 A and 70 keV are obtained with good reproducibility. Diode electrical...
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