The correct choice of the power supply 5 major principles

3C Certification

Of all the power supply, only one power supply has not passed the 3C certification, of course, you can not buy in the market, because the power supply in our market, must pass the 3C certification, the power is not certified the application, waiting for certification a hand, it could be put on the market. This means that in the 3C certification is about to be one year old, the market implementation of the intensity is still very large. So this is not a standard for you to select a power source.

Output test this can be seen in the design of the power supply and materials on some of the details of things, can basically distinguish the power of the pros and cons of a lot of power on the label are marked with very attractive technical specifications. But in the actual test, some say is the actual technical specifications, some are the use of some market tools. The main traps have several aspects:

A. Power traps: This is in the power market has been a trap, and fell into the trap of countless people, through the use of rated power, output power and the maximum power and other word games to mislead consumers, to achieve the purpose of weeding. Here we recommend that you choose the power supply, to see the power of the rated (roted) power is how much? If also nominal maximum power or output power, and more than this rated power, then the power supply nominal rated power is the true value; if there is no nominal maximum power or output power does not matter, look at What is the maximum output power of the +12v&+5v&+3.3v? The maximum output power of the general +12v&+5v&+3.3v plus 20-30w is the rated power of the power supply. If these are not prompted, then have to luck. Generally can let you misunderstand the power will be less than (actual power +100w), if you consider according to this principle, it is also a way.

B.+12V output: Before Intel's latest version of the power supply, the +12v did not put forward how stringent requirements, but with a variety of new CPUs on the +12v to eat more and more requirements, we will +12v output separately, because the output of the +12v will determine what kind of CPU you choose. In fact, can be simply divided as follows. +12V≥18A, you can choose any one of the cpu;+12v≥14a on the market, you can choose Intel Celeron D and P4 processor, +12v≤14a can only P4 low speed and normal Celeron. We suggest that we should tailor it to avoid unnecessary waste.

You can also calculate yourself according to the following formula: (CPU Power consumption W1/12) +2A (motherboard VR power consumption) +1A (hard disk rated power consumption) xn (quantity) +1.5a (optical drive rated power consumption) xn (amount) +3a (margin). Based on this formula, you can estimate the requirements of your system for +12V output.

C. Broadband input: Many of the power supplies indicate that they work properly under 160v-270v broadband input, but this is not the case in actual tests. We have only tested 180-265 of the standard range, there is a part of the power supply can not smoothly start the work, which cannot but say is a relatively large regret.

In this test, each power supply showed different characteristics, some bully not fall, and some shaky, some thriving, some dying. In general, this item can reflect the basic quality of the power supply, the specific choice can be seen in front of us for the data provided.

protection function Verification in this test, we mainly tested the power supply short-circuit protection. In this protection test +5v,+12v and +3.3v protection is basically no problem, only +5VSB protection some problems, a part of the power supply in the case of +5VSB short-circuit, +5v,+12v and +3.3v also have output. This will bring some harm to the electric equipment.

Thermal and mute design heat dissipation problems and your system has a direct relationship, so we can only separate the power supply for thermal analysis, heat dissipation is through some structural design coupled with the fan's active convection to the internal cooling of the power of a technology. In this test, we did not open any one of the power supply, so, did not give a review of the design of the power supply, only through the fan and the surface of the power supply analysis of the temperature, made a simple decision. Generally think that the temperature control fan is better than temperature control 2 small fans better than the temperature control small fan better than the ordinary fan. In our test, the power supply is basically the use of temperature control technology, only individual wind fan does not, but for the power dissipation is enough.

In this report, we have been emphasizing the separation of heat and noise. Noise problem is a relatively vague concept, when you play games or watch the disc, some noise is very tolerable, because it can not feel, but in doing some document processing, the mute is necessary. Generally think: temperature-controlled large fan better than the large fan leaflet temperature-controlled fan, low speed fan better than the high speed fan.

Environmental requirements: Environmental protection is our main advocate of this test, efficiency, power factor and shutdown consumption directly affect the power of environmental protection effect. In the actual test data, the difference between each power is relatively large. This item can be used to speak in a specific number. We can note that the appearance can be seen, the use of active PFC power factor is higher, but because of the use of more advanced technology, at the same time the high cost of materials, so the price is also high; the passive PFC power factor is low, the cost is lower and the price is relatively cheaper, Because the passive PFC is a large inductance, the weight is heavier, so it needs to be fixed by four screws. You only have to look at the power supply of the six face there are four screws fixed can be identified is active or passive PFC, so in combination with the corresponding price, you can do know.

With the development of personal computer technology and widespread popularization, the PC is no longer mysterious, consumers also have a very deep understanding of the various parts of the PC, power supply as a special part of the power supply for other components, its main purpose is to let other parts of the stable performance of their own. This is because of this special role of power, so the homogeneity of the power supply problem is very serious, so you are doing everything possible to launch their own and the public to buy points: such as the appearance of Black gold power, TT's colorful lights, these are businesses used to attract consumers. In the author's opinion, the essence of the power supply is to let other parts of the stable play, rather than the power itself out of what color, as long as the false standard, the power is credible. Knowing this, we can have a correct mentality when we choose the power supply.