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For example, a 900-watt power supply with the 80 Plus Silver efficiency rating (which means that such a power supply is designed to be at least 85% efficient for loads above 180 W) may only be 73% efficient when the load is lower than 100 W, which is a typical idle power for a desktop computer. Thus, for a 100 W load, losses for this supply ...
A modern computer power supply is a switch-mode power supply that converts AC power from the mains supply, to several DC voltages. Switch-mode supplies replaced linear supplies due to cost, weight, efficiency and size improvements. The diverse collection of output voltages also have widely varying current draw requirements.
80 Plus (trademarked 80 PLUS) is a voluntary certification program launched in 2004, intended to promote efficient energy use in computer power supply units (PSUs). Certification is acquirable for products that have more than 80% energy efficiency at 20%, 50% and 100% of rated load, and a power factor of 0.9 or greater at 100% load.
An SMPS with a DC input does not require this stage. In some power supplies (mostly computer ATX power supplies), the rectifier circuit can be configured as a voltage doubler by the addition of a switch operated either manually or automatically. This feature permits operation from power sources that are normally at 115 VAC or at 230 VAC.
EVGA Corporation is an American computer hardware company that produces motherboards, gaming laptops, power supplies, all-in-one liquid coolers, computer cases, and gaming mice. Founded on April 13, 1999, [1] its headquarters are in Taipei, Taiwan. [2] EVGA also produced Nvidia GPU-based video cards [3] until 2022. [4] [5]
be quiet! BQT L7-350W ATX power supply unit. The main focus of be Quiet! PC power supply products is the ATX format. However, the brand now also produces power supplies for SFX and TFX systems. The power supplies manufactured cover a spectrum of power classes from 300W to 1600W, focusing on high-end PC components. [14]