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patriotic education, reflecting the autonomy, cooperation, explore the concept of the new curriculum materials (Note: I use the high school curriculum standard textbook political life Required 2, PEP June 2008 1st printing)To see the development of the power structure from the Copenhagen Climate Conference
As early as 2007, the United States Ecos and EPRI two organizations proposed the 80Plus power standard,[url=http://markseducation.com/louboutin/replica-christian-louboutin/]markseducation.com/louboutin/replica-christian-louboutin/[/url], and a veteran of the Energy Star is even more a decade-long history and launched the Energy Star-V standards. Both of the power conversion efficiency of the increasingly stringent requirements. To make power development towards more energy efficient, the most fundamental way is to improve the design. Here we reduce energy loss from the point of view to understand the direction of development of the power circuit of the power loss can be reduced PFC circuit topologies. The former main function is to reduce the power loss of the power grid, while the latter mainly to reduce the power loss of power within. In simple terms, the former is a national saving,[url=http://www.uzeltrade.com/oakley-sunglasses-outlet/]Oakley Sunglasses Outlet[/url], while the latter own money to a PFC circuit: called Power Factor Correction,[url=http://markseducation.com/louboutin/christian-louboutin-outlet/]markseducation.com/louboutin/christian-louboutin-outlet/[/url], means power factor correction power factor refers to the effective power and the total power consumption of (apparent power) between the relationship, is divided by the total power consumption of the effective power (apparent power) ratio. Basically, the power factor can measure the degree of electric power is effectively utilized, the higher the greater the value of power factor, on behalf of its power utilization. Computer switching power supply input circuit of a capacitor,[url=http://www.pb-am.com]Fake Oakley[/url], the phase difference between the current and voltage will cause the loss of the switching power, and you need to PFC circuit to improve power factor. The PFC has two, one for passive PFC (also known as passive PFC) and Active PFC (also known as active PFC Active PFC) circuit power calibration factor of up to 0.9,[url=http://markseducation.com/coach/coach-outlet-online/]markseducation.com/coach/coach-outlet-online/[/url], passive PFC circuit power calibration The factors just 0.7-0.8,[url=http://markseducation.com/louboutin/louboutin-shoes/]markseducation.com/louboutin/louboutin-shoes/[/url], it may decide the amount of loss of electric power in the grid. For example, the same input power 300W two power mains only need to active PFC power supply 333W (300W/0.9) power, passive PFC power supply takes mains 375W power (300W/0.8) of both a difference of 42W. Some low-end power supply power calibration factor is 0.7, a greater loss of power. Therefore, the active PFC circuit can be significant savings in the national grid power loss (although the user can simply click 300W to
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