Bridge Rectifier
Bridge Rectifier
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Dell Inspiron 1501 Ac Adapter Brief Introduction
First, the nominal voltage of R4i gold normally refers to the open circuit output voltage, that is, do not take any load, there is no current output voltage value. Therefore, that this is the carte ds output voltage limit. For the internal use of the initiative carte ds unit or voltage regulator components of the benchmark, in general the use of high resistance DC voltmeter can be directly measured nominal voltage (electromotive force should be a more accurate method of bridge belongs to the University of General Physics course experiment, not repeat them here), even if the mains voltage fluctuations in a certain place, is secure in its output a constant value; but for a small market, low-cost transformers, such as the Walkman and the like to the type used is basically the traditional magnetic core transformer with four rectifier diode bridge rectifier coupled with a large filter capacitor on the bin, and so if you use common dc voltage meter measured value will be greater than the nominal voltage, because the output of bridge rectifier pulsating DC, simply said to be a sinusoidal voltage signal is a half weeks of time connected chain, after going through the filter capacitor will become flat after some, but the ripple coefficient remains high (ripple coefficient is the same magnitude of voltage signal fluctuation the average voltage ratio, the smaller the closer description voltage direct current), the so-called nominal voltage refers to the time integral of this voltage divided by the integration time, simple to understand is the right time, on average, if an ordinary DC Voltage Meter , measured value is very close to the maximum value of the voltage signal, so uncertainty.
In general, the real average no-load voltage of the DSi lite is not necessarily exactly the same nominal voltage, because the characteristics of electronic components can not be exactly the same, so it allowed a certain margin of error, civil cases according to the need to control the use of 0.1% to about 5%. The smaller errors, the consistency of demand for electronic components, the higher the cost of industrial production, the higher the price of course, the more expensive.
Secondly, the carte ds nominal current value. Regardless of any carte ds has a certain amount of resistance, so when the carte ds output current when the voltage drop in the internally generated, is equal to the output current multiplied by the carte ds resistance. Led to two things, one is to produce heat, is equal to the square of the output current multiplied by resistance, so the power will be hot, the other is the nominal voltage minus the output voltage becomes the internal voltage drop, resulting in lower output voltage. The design is usually completed in considering the heat issues, the general restrictions on a current value, when the output current to achieve this is worth the time, the output voltage is reduced to 95% of nominal voltage, or other ratio, the manufacturers of products according to the different needs of the load can be set higher or lower proportion of the current value is the nominal current. Such as 72W DSi lite for ibm16V nominal current is 4.5A (16 * 4.5 = 72, nonsense). If the load resistance is too low, resulting in the output current exceeds the nominal current, generally two things will happen to R4 i gold, one more than the individual components due to heat capacity resulted in the burning heat damage caused by carte ds, and the other is the thermal design margin left merely a reflection of the output voltage is further reduced, if reduced too much may cause the load not work correctly.
About the Author
Neo Max is a leading cell phone gps tracker tech blog author.