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A DC connector (or DC plug, for one common type of connector) is an electrical connector for supplying direct current (DC) power. Compared to domestic AC power plugs and sockets, DC connectors have many more standard types that are not interchangeable. The dimensions and arrangement of DC connectors can be chosen to prevent accidental interconnection of incompatible sources and loads. Types vary from small coaxial connectors used to power portable electronic devices from AC adapters, to connectors used for automotive accessories and for battery packs in portable equipment. == Cylindrical connectors == (詳細は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. 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'', while the inner one is called the ''tip''. There are a wide variety of sizes and designs for these power connectors, and many appear quite similar to each other yet are not quite mechanically or electrically compatible. In addition to a plethora of generic designs (whose original designer is unknown) there are at least two different national standards—EIAJ in Japan and DIN in Germany, plus the JSBP connector used on some laptop computers. The Japanese EIAJ standard includes five different sizes, with each supporting a specified range of voltages. Most of the other coaxial DC power connectors have no specified voltage association, however. The most common plugs are in outside diameter (OD) and in length. Two pin sizes are common in the jacks for this size plug body, and , and the plugs should ideally match. Generic plugs are often named for the pin diameter they are designed to take. Contact ratings commonly vary from unspecified up to 5 A (11 amps for special hi-power versions from some companies〔http://www.mouser.com/new/switchcraft/Switchcraft-HiAmpJP/〕), with 1 A, 2 A and 5 A being common values.〔http://www.mouser.com/ProductDetail/Switchcraft/S760K/?qs=Z0CQwBkL9d0b%252by2xBlPCrw==〕 Voltage is again often unspecified, up to 48 V with 12 V typical. The smaller types usually have lower ratings, both for current and voltage. The 'tip' (i.e., the inner conductor) usually carries the positive (+) pole. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「DC connector」の詳細全文を読む スポンサード リンク
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