Power adapters are widely used in various industries, such as water purifier, cash register, intelligent security, commercial display advertising machine, CCTV, scanner, LED etc. Different products have different requirements for the DC size of the power adapter. There are many standards for dc connectors. So today we’ll discuss part of them. The types of DC heads can be roughly divided into the following:
Coaxial power connector
1.2.5*0.7 (outer diameter * inner diameter, the same below): referred to as dc2507, it is mainly used for small electronic products and mini electronic products with limited volume, such as tablet computers; At present, tablet computers of major brands are charged with micro usb interface.
• OD – Outer diameter of the plug.
• ID – Inner diameter of the plug.
2. 3.5*1.35 (dc35135): mainly used for network set-top box, USB hub external power supply, webcam, LED desk lamp, etc.
3. 4.0*1.7 (dc4017): mainly used for mobile DVD, EVD, PSP and some network set-top boxes.
4. 5.5*2.1 (dc5521): the most widely used DC round head interface at present. The most common type of DC connectors used is the 2.1mm DC connector. This has a 2.1mm centre pin and has an outside diameter of 5.5mm. Most of our single voltage power adapters adapt this 2.1mm DC plug. Surveillance cameras, some set-top boxes, led stations, digital appliances, printers, scanners, etc.
5. 5.5*2.5 (dc5525) is mainly used for equipment with slightly higher power. If some laptops, electric cars, etc.
The most commonly used of the above are 5.5*2.1 and 5.5*2.5.
Most appliances will have a circular connector with the inside hole carrying one pole and the outside carrying the other. The most common is centre positive (+) connectors. There is also the less popular centre negative (-) connector. The adapter and the device must match so always double check the symbol on the AC adapter and the device show the same polarity. If there are no special requirements, people generally adopt the design of positive inside and negative outside. This design allows users to clearly identify the positive and negative poles when connecting the power cord, thereby avoiding equipment damage or safety accidents caused by reverse connection.
The DIN connector
DIN power connector are a style of connectors with four-pin or socket contacts encased in a circular housing. Power DIN connectors are often used in moderate power applications when barrel connectors are not able to carry the required current.
The terminal connector
The small, field-proven connector for printed circuit boards is reliable and has a large current carrying capacity. It can be used with a wide variety of signal, power supply, and out put circuits that appear in consumer electronic products.
