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HP Power Supplies
Connectors for supplying direct current (DC) power are poorly standardized compared to domestic AC power plugs and sockets. more...
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DC plug is a common name used for one common type of cylindrical two-conductor plug available in a range of sizes and used to power small pieces of electronic equipment. It is also used to describe some older multi-pin plugs.
Several competing standards exist for DC plugs, and in some cases incompatible plugs will fit together, or can be made to fit, possibly damaging equipment if:
the voltage is wrong;
the polarity is wrong;
current ratings are exceeded;
power supply filtering or stability is inadequate for the equipment being powered;
non-matching connectors are forced together.;
Cylindrical types
Also known as barrel connectors, concentric barrel connectors or tip connectors, small cylindrical connectors come in an enormous variety of sizes.
The intended use of these plugs is on the cable connected to a power supply. The matching jack or socket is then mounted in the equipment to be powered. Some of these jacks contain a normally closed contact, which can be used to disconnect internal batteries whenever the power supply is connected, avoiding the risk of battery leakage or explosion posed by incorrect recharging of the batteries.
Cylindrical plugs generally have an insulated tip constructed to accept insertion of a pin (but note also the internal pin in the larger size EIAJ plugs). The outer body of the plug is one contact, most often but not always the negative side of the supply. A pin mounted in the socket makes contact with a second internal contact. The outer plug contact is often called the sleeve, and the inner the tip, although the tip itself is actually non-conductive.
At least two different national standards exist, EIAJ in Japan and DIN in Germany. As well several conventions have been adopted by specific manufacturers, notably by Sony, to indicate voltage by plug size.
Some manufacturers use opposite polarity standards, and some generic power supplies cater for this by allowing the polarity to be reversed by use of a switch or an unpolarised two-pin plug and socket arrangement. These two-pin plugs seem to be standardized but official specifications are hard to find. The pins are 1.5 mm in diameter, 6 mm long and spaced 4.2 mm apart. (see Egston connector overview, page 6, number 230)
Some power supplies allow the voltage to be switched. Four-way X connectors or six-way star connectors, also known as spider connectors, with multiple plug sizes and types are common on generic power supplies. On others there are arrangements for changing the connector, with from four to nine different connectors available.
Read more at Wikipedia.org
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