What are the interconnection modes of the circuit board?

Electronic components and electromechanical components have electrical contacts. The electrical connection between two discrete contacts is called interconnection.  Electronic devices must be interconnected according to circuit schematics to perform their intended functions.  

A printed board as a part of the whole machine, generally can not constitute an electronic product, there must be external connection problems.  For example, electrical connections are required between printed boards, between printed boards and external components, and between printed boards and equipment panels.  It is an important part of PCB design to choose the connection with the best reliability, technology and economy.  There are many kinds of external connection modes, which should be flexibly selected according to different characteristics.  

Interconnection mode of circuit board i. Welding mode  

The advantages of the connection mode are simple, low cost, high reliability, can avoid the failure caused by poor contact;  Disadvantage is exchange, maintenance is not convenient.  This method is generally applicable to parts with few external leads.  

1. PCB wire welding This method does not require any connectors, as long as the external connection point on the PCB printed board is directly welded to the components or other components outside the board with the wire.  Such as radio speakers, battery cases, etc.  

Note the following when welding the interconnection of the circuit board:  

(1) The pads of welding wires should be on the edge of PCB printed board as far as possible and arranged in a uniform size to facilitate welding and maintenance.  (2) In order to improve the mechanical strength of wire connection and avoid pulling the solder pad or printed wire due to wire pulling, drill holes should be drilled near the solder spot on the PCB printed board to let the wire pass through the through hole from the welded surface of the printed board, and then insert the solder pad hole from the component surface for welding.  (3) Arrange or tie the wires neatly, and fix them with the plate through wire clips or other fasteners to avoid breaking the wires due to movement.  

2, PCB line welding Two PCB PCB PCB line connection, reliable and not easy to occur connection error, and the two PCB board relative position is not limited.  

Direct welding between printed boards. This method is usually used to connect two printed boards at an Angle of 90 degrees.  Connect to form a single PCB component.  

Circuit board interconnection mode two: connector connection mode  

In the more complex instruments and equipment, the connector connection is often used.  This "building block" structure not only ensures the quality of mass production, reduces the cost of the system, and provides convenience for debugging and maintenance.  When a device fault occurs, maintenance personnel do not need to check the component level (that is, check the cause of the fault and trace the source to the specific component).  This work needs to spend quite a lot of time), as long as the judgment is which board is abnormal, it can be replaced immediately, troubleshooting in a short time, shorten the downtime, improve the utilization rate of equipment.  The replaced circuit board can be repaired in sufficient time and used as spare parts after repair.  

1, printed board socket in more complex instruments and equipment, often use this connection. This method is to make a printed plug from the edge of the PCB board, and the plug part is designed according to the size of the socket, the number of contacts, the distance of contacts and the position of the positioning hole, so that it matches the special PCB PCB board socket.  

When the plate is made, the plug part needs to be gold-plated to improve wear resistance and reduce contact resistance.  This way is simple to assemble, interchangeability, good maintenance performance, suitable for standardized mass production.  Its disadvantage is that the cost of the printed board increases, and the manufacturing precision and technology of the printed board are higher.  Slightly poor reliability, often due to the plug part is oxidized or socket reed aging and poor contact.  In order to improve the reliability of external connection, the same lead line is often led out in parallel through the contacts on the same side or both sides of the circuit board.  

PCB socket connection mode is often used for multi-board structure products, socket and PCB or bottom plate have two types of reed and pin.  

2, standard pin connection this method can be used for external connection of the printed board, especially in small instruments often used pin connection.  Two printed boards are connected by standard pins, usually parallel or vertical, making it easy to mass produce.