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Voltage Source Inverter Drives and the use of Power
Voltage Source Inverter Drives and the use of Power

AA23166170
AA23166170

... be large enough and kept constant at that value to stabilize the compensation. Therefore, DC link voltage regulator must be added to the control loop. To separate the oscillating real power components a low-pass filter is used. Together with the switching and ohmic losses of the PWM converter, the i ...
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... Graph and lists are created by a click on the data file. • Graph and lists of the recorded data file are created by clicking on the desired data file. They can be displayed and copied on a clip board so it can be used on other software such as Word or Excel spread sheet. • The time axis and measur ...
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... over the band of interest, ultimately making the converter’s performance worse. Why is this? If the full-scale input to the transformer or amplifier is lowered, the gain must be increased. This looks fine on paper, for transformers they are more gain-bandwidth dependent than amplifiers. Therefore, o ...
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... (integrates AC, audio and network) 10 kΩ differential between pins 2 and 3 Pin 1: Chassis/earth through 220 kΩ, 1000 pF, 15 V clamp network to provide virtual ground lift at audiofrequencies ...
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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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