One factor that enables as low noise level is a solid source of efficiency. Almost all the energy w

You can picture the alternating current steam density taken as a wave which oscillates 60 times per second, as opposed to direct current, which is a continuous stream. The AC use brutally reduces loss during transmission, which makes it ideal for use in public, but. Appliances such as fans, refrigerators and heaters work well with AC, but electronics in general need it to be transformed into direct current, which leads us to the power supply.
The basic function of the power supply is to convert the alternating current into direct current electric steam density network, filtering and stabilizing the current and generate voltages of 3.3V, 5V and 12V supplied to the other components. In switching power supplies currently used, it is done basically 4 steps.
The right sink is connected to a transistor steam density group whose function is to increase the frequency of the current, generating high frequency current that is passed to the following components. The idea is to reduce the interval steam density between cycles, which reduces the work required to turn it into DC later. These transistors inevitably transform much of the heat energy, rightfully so are fastened to the metal sink.
The high-frequency current then passes through the transformers that reduce the voltage and then by a group of diodes (sink attached to the left) and a group of capacitors, which have the function of transforming the current into direct current steam density and stabilize it , protecting, to some degree, micro components of voltage variations, surges and other anomalies in the electrical network.
Many of the source production steps are done manually, so it is very common to find clamps, manual welds and even prisoners components with hot glue, even in good quality sources. It is precisely why the vast majority of sources are produced in asia countries, where labor is cheaper.
Here is a photo of the internal components of a Corsair VX450W. The huge blue capacitor on the left is the primary source of the capacitor, a Hitachi of 330uF and 400V, certified to work up to 105C, which puts him in the category of capacitors for industrial steam density use (capacitors for domestic use are certified to work up to 85C).
As with other current sources, VX450W steam density uses an exhaust fan 120 mm. It is surprisingly quiet; makes a noise of only 21 dBA while the source is working with up to 400 watt load and 30 dBA when the source is required to work at full load. The noise is what is virtually inaudible, lower the noise emitted by the hard drives and much lower than the one issued by the CPU cooler.
One factor that enables as low noise level is a solid source of efficiency. Almost all the energy wasted by the source is transformed into heat, so that a source that wastes less energy also heats less.
The specifications promise a minimum of 80% efficiency with any load from 20% of the supply capacity and a maximum of 85% in ideal situations, much higher than the values of cheap sources, which work in most cases 65% efficiency:
As you can see in this chart from Corsair, the source reaches the maximum level of efficiency (85%) working at half capacity and mains 220V. Using 110V voltage, the maximum reached by the source are 83%, which in any case is a good brand. Using lower loads or near 450 watts, efficiency drops to 81% range. And normal steam density for multi-voltage sources present a slightly better efficiency when connected to an outlet 220V instead of 110V, in the case of VX450W the difference is around 2%.
The check the specifications of any source, look for the minimum efficiency (100% load), which should never be less than 70% (ideally that is 80% or more) and see if there is any ideal efficiency specification, which is achieved when the source is working steam density under load.
In this example (of a source of low cost Huntkey) specification comes to 85% efficiency, but then talk in 70% minimum efficiency at full-load, indicating that the efficiency in actual use is between two extremes, according to the charging percentage:
In the case of PCs that are continuously connected, use a font that works with 80% or more efficiency, ends up being cheaper in the long run than using a generic font that works with a percentage of lower efficiency and consequently waste more energy.
A PC whose internal components consume 200 watts average (not including the monitor, since it is not fed by the power supply), would consume steam density 307 watts is used a source with 65% efficiency. By switching to a source with 80% efficiency, consumption would fall to just 250 watts,