|
CTL Computer Technologies Ltd. |
|
|
Power supply unit guidance Power supply units are designed to produce a pre determined amount of output power which is called the maximum power. All Seasonic power units which we distribute have an over power limiter which limits the available output power to approximately +10 to +15 percent above the maximum power limit. For example, a 300W power unit will be limited to between 330 and 345W maximum power The purpose of the internal power limiter is to ensure that the power unit will not exceed its specified power limits thus protecting its internal circuits. In addition to this, the conducted and radiated emissions are limited so as to remain within mandatory levels. The system manufacturer should be able to calculate the system loading for each specific configuration, not just in its quiescent state but also in its maximum power state. This information can usually be obtained from the individual system component manufacturers and not from the chassis/psu distributor. More information about approved and recommended power supply units may be obtained form the various CPU manufacturers web sites. A common mistake which is usually made when designing a computer system is that a power unit with insufficient output power capacity is used for an application which demands significantly more power than is available. In this case there may be sufficient power for the system to power up in its quiescent state for an undetermined period. As soon as further system applications are enabled the power loading may be significantly increased, possibly beyond the power limit of the psu. This may cause the system to become unstable and the power limiter to activate thus closing down the power supply unit. When the system is designed using high speed cpu's, very fast memory modules and high speed graphics cards much consideration must be given to the correct choice of power supply unit output ratings. In this particular case if a psu with insufficient output power was used then it is quite possible that the system would lock up during its boot up stage. Some power units are designed with "financial constraints" in mind and do not have power limiters and other related circuits. As a result of this the output power levels may be infinite, only limited by the breakdown of the psu's internal components. One possible effect of an unlimited psu is that the conducted and radiated emissions may significantly exceed set mandatory levels which may affect other electronic equipment and devices in nearby proximity. CTL Computer Technologies Ltd only distributes power supply units which conform with CE, LVD, Conducted and Radiated emissions standards. As part of our on going commitment to quality, we sample test these products in our EMC test facility to ensure that they meet strict set standards thus giving our customers product confidence. Further more, sample testing of the various psu parameters is regularly conducted, measuring loading, regulation, timing etc. using a state of the art psu analysis system. This is done to verify the manufacturers specifications. We are proud to state that our failure rate is less than 1% on power units which are operated within their parameters. Sometimes and against our professional advice, the power units which we distribute may be used in applications where the power demands are in excess of the manufacturers ratings. In this case the manufacturers warranty may be voided and it will be at the manufacturers discretion if the unit will be replaced. All our products are of very high quality and reliability and embrace all mandatory requirements for this type of product while at the same time providing excellent value for money. We are always very wary about products which claim unbelievable specifications for extremely low prices. Unfortunately you do not get "something for nothing" or can expect to get super car performance for the price of an old banger. Please note that the above mentioned information is given as basic information only on the understanding that CTL Computer Technologies Ltd accept no liability what so ever for any resulting misunderstandings , actions, implications or likewise and that the information is used at the readers own risk.
|
Copyright © 2004 CTL Computer Technologies Ltd View in 1024 X 768 Medium size Last modified: 13 June 2007 |