Switching power supply is a type of power supply that uses modern power electronics technology to control the time ratio of the switch tube to turn on and off and maintain a stable output voltage. The switching power supply generally consists of a pulse width modulation (PWM) control IC and MOSFET. With the development and innovation of power electronics technology, switching power supply technology is also constantly innovating. At present, switching power supplies are widely used in almost all electronic devices due to their small size, light weight and high efficiency. It is an indispensable power supply method for the rapid development of the electronic information industry today.
At present, there are two types of terminals commonly used in switching power supplies in China, such as copper-screw threaded terminals and parallel pressure plate threaded terminals. The former is the most widely used.

Copper post type is a more traditional wiring method. The biggest advantage of this wiring method is that it is more convenient and reliable. Due to the large volume of copper pillars, heat dissipation is very good. High-current switches and sockets generate high temperature rise, so copper pillar terminals are generally used to dissipate heat to meet the requirements of the temperature rise test. The huge pressure generated by the screw will slightly deform the wire, and firmly press the wire to prevent it from coming out. However, the disadvantage is that the screw easily crushes or even breaks the wire, and the cost is higher than other screw-type terminals. The copper post and the copper sheet riveting place will have a higher contact resistance. When the screw is tightened, the copper post may rotate relative to the copper sheet. With serious consequences.

Parallel pressure plate screw terminal is the most widely used connection terminal. It has simple process, convenient processing and very low cost. The pressure plate and screw materials are generally made of A3 steel. After heat treatment, the surface is galvanized to achieve high strength and corrosion resistance. Generally, the conductive strips and pressure plates of this type of terminal will use a die to punch some indentations such as horizontal stripes or grids. When tightening the screws, the horizontal stripes can damage the surface of the wire, increase the contact area, and make the wire difficult to come out. The biggest disadvantage of this wiring method is that it is difficult to compress two wires with different diameters at the same time. The pressure plate and the conductive strip always maintain a parallel relationship. When the screw is screwed, the pressure plate is raised and lowered in parallel. Two wires with different diameters can only compress the wires. Larger diameter wires.

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