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Product Brief (1200V XPT IGBTs)_15OCT12
Product Brief (1200V XPT IGBTs)_15OCT12

... AC input (185VAC-265VAC) from the power grid is applied to the rectification stage to be converted into a DC value. This DC value then goes through the PFC circuit where its distorted current is reshaped into a waveform in phase with the input voltage. The DC output of the PFC circuit next enters the ...
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... the BNC connector) must be grounded. • Make sure to avoid an electric shock when connecting the probe to the object of measurement. Do not remove the probe from the measuring instrument after the object of measurement is connected. • When disconnecting the probe BNC output connector, first turn OF ...


... systems. The current harmonics are widely spread in industrial systems. These harmonics interact with system impedances and lead to current harmonics which badly affect sensitive loads. There are many methods for harmonic extraction such as Discrete Fourier Transform, Fast Fourier Transform [2-3], s ...
Lab #12 DC Power - Northern Arizona University
Lab #12 DC Power - Northern Arizona University

... To further improve the quality of the DC power supply, you can add a voltage regulator circuit, a special integrated circuit that regulates the output voltage to a precise value. These circuits are widely used in DC power supplies in consumer electronic products. We will use the LM7805 voltage regul ...
U4501117122
U4501117122

... shuC ∗ and Eq shuC ∗ based on power fluctuations _P and _Q, respectively. Such deviations are calculated subtracting the mean power from the instantaneous power measured in PCC. The mean values of active and reactive power are obtained by low–pass filtering, and the bandwidth of such filters are cho ...
Untitled
Untitled

... The power grid is the infrastructure that transports electrical energy from generation plants to customers. The power grid is typically separated to transmission and distribution grid. Transmission grid typically consists of generation plants and high voltage (HV) transmission lines. Distribution sy ...
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IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE) e-ISSN: 2278-1676,p-ISSN: 2320-3331,
IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE) e-ISSN: 2278-1676,p-ISSN: 2320-3331,

... strategies. Hence boost converters not only provide regulated dc output voltage but also maintained near unity power factor and reduce THD of the input current [6]. The boost type converters with various topologies have found wide spread use in various applications due to its advantages such as high ...
additional maximum voltage and maximum power transfer conditions
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Equalizing voltage levels in MV distribution network of Elektra Zagreb
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... connected to LV network started complaining on problems with supply voltage. Number of complaints rose in the past decade due to large number of consumer electronics used in households that are very sensitive to voltage change. Number of 10/0,4 kV substations Elektra Zagreb is in charge is approxima ...
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... converters (CSC-UPQC), including the design guidelines of the key components, an appropriate control scheme, and a selection procedure of the dc current level. Particularly, the ride through capability criterion is used to define a minimum dc current level so that the CSCUPQC achieves the same chara ...
AC Fundamentals - New Age International
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... the above, wavelength can be measured from any part of one cycle to the equivalent point in the next cycle. Wavelength is very similar to period as discussed above, except that wavelength is measured in distance per cycle while period is measured in time per cycle. Amplitude: Mathematically, the amp ...
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... from each by 120 degrees. They have the same phase sequence as phasors representing the nominal current of voltage. The presence of harmonic can accelerate a motor which may cause them to overwork. th th th Negative sequence harmonics (5 , 11 , and 17 ) also consist of three phasors with equal magni ...
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EES612-Lab-1 Single - Department of Electrical and Computer
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... Transformers are widely applied in many electrical systems, small or large. A few of their most tangible areas of application include long-distance, bulk power transmission systems, medical and consumer electronic devices for level shifting and galvanic isolation, audio, video, and radio systems for ...
ADAT Extender
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Installation and Operations Manual PoweRack 230e Power Unit
Installation and Operations Manual PoweRack 230e Power Unit

... designed for use with Lucent’s P230e NT1 circuit cards. There is capacity for a quantity of 12 or24 NT1p-230e’s that provide power and signal for 24 to 48 multipoint phones. Each P-230e is a PC card NT1 with single "U" input. Input connections for the “U” Interface are made via a 25 Pair connector o ...
RFHA1101 RF OUT VD RF IN
RFHA1101 RF OUT VD RF IN

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Decibel

The decibel (dB) is a logarithmic unit that expresses the ratio of two values of a physical quantity, often power or intensity. One of these quantities is often a reference value and in this case the decibel expresses the absolute level of the physical quantity. The number of decibels is ten times the logarithm to base 10 of the ratio of two power quantities, or of the ratio of the squares of two field amplitude quantities. One decibel is one tenth of one bel, named in honor of Alexander Graham Bell; however, the bel is seldom used.The definition of the decibel is based on the measurement of power in telephony of the early 20th century in the Bell System in the United States. Today, the unit is used for a wide variety of measurements in science and engineering, most prominently in acoustics, electronics, and control theory. In electronics, the gains of amplifiers, attenuation of signals, and signal-to-noise ratios are often expressed in decibels. The decibel confers a number of advantages, such as the ability to conveniently represent very large or small numbers, and the ability to carry out multiplication of ratios by simple addition and subtraction. By contrast, use of the decibel complicates operations of addition and subtraction.A change in power by a factor of 10 is a 10 dB change. At the half power point an audio circuit or an antenna exhibits an attenuation of 3dB. A change in voltage by a factor of 10 results in a change in power by a factor of 100, which is a 20 dB change. A change in voltage ratio by a factor of two approximately corresponds to a 6 dB change.The decibel symbol is often qualified with a suffix that indicates the reference quantity that has been used or some other property of the quantity being measured. For example, dBm indicates a reference power of one milliwatt, while dBu is referenced to approximately 0.775 volts RMS.In the International System of Quantities, the decibel is defined as a unit of measurement for quantities of type level or level difference, which are defined as the logarithm of the ratio of power- or field-type quantities.
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