It changes in most cases reduces the level of supply to a value suitable for driving the load circuit. On a modular power supply unit, those cables can be detached from the psu. Classification of power supply and its different types. A psu power supply unit converts the power received from the wall outlet to the power power needed to supply power to the mother board and all other components within the pc. An ac mains system is a low impedance power source meaning that it can supply a. Switchedmode and uninterruptible power supplies, and electronic. Laptops use an external power supply, called a power adapter or power brick. Application manual power supply units applications for. Power supply is one of the most important topics that we often ignore. The primary goal of safety standards for power supplies used in electrical. It receives power from an electrical outlet and converts the current from ac alternating current to dc direct current, which is what the computer requires. The international electrotechnical commission iec and the associated international. Figure 3 unregulated power supply the ac mains voltage 5060 hz applied at the input side is transformed to a lower level and rectified by a subsequent rectifier.
Power supplies must only be installed and taken into operation by adequately qualified. Intel technologies features and benefits depend on system configuration and may require enabled hardware, software or service. It converts the alternating current from your wall outlet into a continuous form of power called direct current that the computer components require. Pdf file also enable you to go directly to the next desired catalogue page. A switchedmode power supply smps is an electronic circuit that converts power using switching devices that are turned on and off at high frequencies, and storage components such as inductors or capacitors to supply power when the switching device is in its nonconduction state. Psu an electronic module that converts high voltage 110 or 240 vac alternating current mains electricity into smoothed direct current at the various differnt voltages required by the motherboard. Essential guide to power supplies 1st edition xp power romania. Variable ac supply, linear regulated unregulated supplies, smps and ups. A power supply is a hardware component that supplies power to an electrical device. Typically, it converts one type of electrical power to another, but it may also convert a a different form of energy such as solar, mechanical, or chemical into electrical energy. Modern personal computers universally use a switchedmode power supplysmps. It converts ac to a single dc voltage that goes to the laptops internal power supply, which generates all other. It also regulates the voltage to an adequate amount.
The curve varies from model to model examples of how this curve looks can. This video explains linear power supply basics with supporting circuit diagrams and waveforms. Power supply safety standards, agencies and marks cui inc. A power supply is a component that supplies power to at least one electric load. A power supply unit or psu converts mains ac to lowvoltage regulated dc power for the. Power supply unit a power supply unit psu converts mains ac to lowvoltage regulated dc power for the internal components of a computer. Further technical articles are available online at. Definition what does switchedmode power supply smps mean.
Pdf optimal reactive power supply in distribution networks. Other devices which need to be cooled include the power supply unit. Finally, it describes and explains application examples for engineering. Pdf energy efficiency of computer power supplies researchgate.
Pdf on jan 1, 2002, bernard aebischer and others published energy. A label on one side of the box lists technical information about the power supply. A computer power supply is in a metal box that is difficult to open, so most people treat a. The computers power supply unit psu converts the domestic alternating current ac mains supply voltage 220240 volts in europe into various regulated, low voltage direct current dc outputs required by the components that make up the computer system. Single and threephase switched mode power supply units. The power supply unit is the piece of hardware that converts the power provided from the outlet into usable power for the many parts inside the computer case. Power supply design guide for desktop platform form factors intel. Power supply unit article about power supply unit by the. Some power supplies have a manual selector for input voltage, while others automatically adapt to the supply voltage. No responsibility is taken for the correctness of technical information.