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June 14th, 2014

regular power adapter is not necessarily true

Interpretation of basic knowledge Notebook - power adapter on the power supply, power supply, power supply and load matching or discussion, there are a few common questions are as follows:

1, the power adapter (hereinafter referred to as power) of the nominal voltage and current mean?

2, are of the same nominal power supply voltage, output current different, the same can not be used in the books?

3, the same machine, Managing someone else's power, I'm always very hot, and why?

4, power supply nominal voltage than my laptop battery voltage is much higher, will not trouble you?

5, why the power theory, first wife first wife is usually the power is better than non-?

First, the nominal voltage of the power adapter is usually open circuit output voltage, which is not connected to any load, no current output voltage value. Therefore, that this is the power supply output voltage limit. For the power regulator unit for use within the active component in the voltage reference or, in general the use of high resistance of the DC voltage meter can be directly measured nominal voltage (electromotive force should be used more accurate method of bridge, belonging to the University Physics course experiment, not repeat them here), even if the mains voltage fluctuations in a certain place, the output is steadily constant value; but for a small inexpensive transformer market, such as a music player like the kind used is basically the traditional magnetic core transformer rectifier diode bridge rectifier with four plus a large filter capacitors to get away, 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, it is a sinusoidal voltage signal of a positive half cycle of time connected chain, filtered through a large capacitor will become a flat number, but still large ripple factor (the ripple coefficient is the same voltage signal fluctuation The ratio of the average voltage, the smaller the closer that the DC voltage), the so-called nominal voltage refers to the time integral of this voltage divided by the integration time, the simple understanding is that the average value of time, if common DC voltmeter measured value is very close to the maximum value of the voltage signal, so the uncertainty. Also, if the electricity fluctuates, the output of such power will also change.
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