19/11/2015, 21:46 |
Obs.: Não utilize o no-break para alimentar equipamentos movidos a motor (liquidificadores, geladeiras, furadeiras, etc.), computadores que possuam fonte com PFC ativo e equipamentos de sustentação da vida e/ou monitoramento de funções vitais.
isso ta escrito no manual do produto o.o do nobreak de 1500va da apc, diz tbm q tem regulação online então o preço ta bacana
regulação online quer dizer que sempre o computador vai ser abastecido pela bateria né.
uma explicação da apc:
This document will explain why some BackUPS or SmartUPS SC models may drop the load or trigger an Overload indication while on battery, when the attached load consists of PFC (power factor corrected) power supplies.
Answer
Power Factor Corrected (PFC) power supplies are becoming increasingly popular in desktop PC’s in North America. Contributing to this trend is the fact that Energy Star 4.0 compliance as of July 2007, requires the use of PFC in desktop PC’s. Please see reference to the Energy Star 4.0 compliance Tier 1 at www.energystar.gov/
What is Power Factor and Power Factor Correction?
Power factor is the percentage of electricity that is being used to do useful work. It is expressed as a ratio. For example, a power factor of 0.72 would mean only 72% of your power was being used to do useful work. Perfect power factor (which in this case is being achieved by the computer’s PFC power supply) is 1.0 (unity), meaning 100% of the power is being used for useful work. Power Factor Correction is a circuit design technique to increase the power factor of a device so that it approaches 1, or unity power factor.
Although computer power supplies draw only a fraction of their full capacity during it’s steady state(normal operation), PFC power supplies have the potential to draw their full capability during initial inrush. "Inrush" or "Inrush Current" refers to the maximum instantaneous input current drawn by an electrical device when first turned on.
A computer’s power supply may also be subjected to a period of inrush, while the UPS is changing state (switching from utility power to battery power and back). Back-UPS and Smart-UPS SCs may experience up to an 8ms transfer time during this period. This is just long enough to remove power from the PFC power supply, resulting in a momentary inrush of the PFC. Once the UPS changes states from "Online" (passing utility power) to "Onbattery" (passing power from the UPS's internal battery), the momentary inrush from the attched equipment subjects the UPS to the PFC power supply’s maximum power draw, resulting in a potential Overload condition or dropped load.
An Energy Star 4.0 compliant power supply has to be more than 80% efficient. For example, if a PFC power supply is delivering 600W output power, its ‘input’ power can be as high as 750W. .
This ‘input’ power should be the basis for sizing the UPS, so as not to Overload the UPS. This can be calculated by taking the PFC power supply’s rated output power and multipling it by 1.25 as follows;
600W x 1.25 = 750w
isso ta escrito no manual do produto o.o do nobreak de 1500va da apc, diz tbm q tem regulação online então o preço ta bacana
regulação online quer dizer que sempre o computador vai ser abastecido pela bateria né.
uma explicação da apc:
This document will explain why some BackUPS or SmartUPS SC models may drop the load or trigger an Overload indication while on battery, when the attached load consists of PFC (power factor corrected) power supplies.
Answer
Power Factor Corrected (PFC) power supplies are becoming increasingly popular in desktop PC’s in North America. Contributing to this trend is the fact that Energy Star 4.0 compliance as of July 2007, requires the use of PFC in desktop PC’s. Please see reference to the Energy Star 4.0 compliance Tier 1 at www.energystar.gov/
What is Power Factor and Power Factor Correction?
Power factor is the percentage of electricity that is being used to do useful work. It is expressed as a ratio. For example, a power factor of 0.72 would mean only 72% of your power was being used to do useful work. Perfect power factor (which in this case is being achieved by the computer’s PFC power supply) is 1.0 (unity), meaning 100% of the power is being used for useful work. Power Factor Correction is a circuit design technique to increase the power factor of a device so that it approaches 1, or unity power factor.
Although computer power supplies draw only a fraction of their full capacity during it’s steady state(normal operation), PFC power supplies have the potential to draw their full capability during initial inrush. "Inrush" or "Inrush Current" refers to the maximum instantaneous input current drawn by an electrical device when first turned on.
A computer’s power supply may also be subjected to a period of inrush, while the UPS is changing state (switching from utility power to battery power and back). Back-UPS and Smart-UPS SCs may experience up to an 8ms transfer time during this period. This is just long enough to remove power from the PFC power supply, resulting in a momentary inrush of the PFC. Once the UPS changes states from "Online" (passing utility power) to "Onbattery" (passing power from the UPS's internal battery), the momentary inrush from the attched equipment subjects the UPS to the PFC power supply’s maximum power draw, resulting in a potential Overload condition or dropped load.
An Energy Star 4.0 compliant power supply has to be more than 80% efficient. For example, if a PFC power supply is delivering 600W output power, its ‘input’ power can be as high as 750W. .
This ‘input’ power should be the basis for sizing the UPS, so as not to Overload the UPS. This can be calculated by taking the PFC power supply’s rated output power and multipling it by 1.25 as follows;
600W x 1.25 = 750w