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The first IBM PC power supply unit (PSU) supplied two main voltages: +5 V and +12 V. It supplied two other voltages, −5 V and −12 V, but with limited amounts of power. Most microchips of the time operated on 5 V power. Of the 63.5 W these PSUs could deliver, most of it was on this +5 V rail.
In the event that an abnormal high-current power draw is detected, the switched-mode supply can assume this is a direct short and will shut itself down before damage is done. PC power supplies often provide a power good signal to the motherboard; the absence of this signal prevents operation when abnormal supply voltages are present.
Specifications taken from the packaging of a 610 W PC power supply showing active PFC rating. Active PFC is the use of power electronics to change the waveform of current drawn by a load to improve the power factor. [25] Some types of the active PFC are buck, boost, buck-boost and synchronous condenser. Active power factor correction can be ...
The original PoE standard, IEEE 802.3af-2003, [1] now known as Type 1, provides up to 15.4 W of DC power (minimum 44 V DC and 350 mA) [2] [3] on each port. [4] Only 12.95 W is guaranteed to be available at the powered device as some power dissipates in the cable.
On 7 February 2023 at 06:17 a.m. WIT, a Pilatus PC-6 Porter aircraft with the registration number PK-BVY [6] belonging to Susi Air arrived from Timika to Paro airport, Nduga. Shortly after landing, it lost contact with air traffic control. [7] A search was conducted from the air, which soon sighted a burning aircraft.