What are the interconnections of PCB circuit boards?

Electronic components and electromechanical parts have electrical contacts, and the electrical connection between two discrete contacts is called interconnection. Electronic devices must be interconnected in accordance with the circuit schematic in order to achieve the intended function.

Way one:

Welding method a printed board as a component of the whole machine, generally can not constitute an electronic product, there is bound to be the problem of external connections. Such as printed circuit boards, printed circuit boards and off-board components, printed circuit boards and equipment panels, all need electrical connections. Selection of reliability, manufacturability and economy of better with the connection, is one of the important elements of the design of the printed circuit board. There can be a variety of external connections, to be selected flexibly according to different characteristics. The advantages of the connection is simple, low cost, high reliability, can avoid failures caused by poor contact; disadvantages are interchangeable, maintenance is not convenient enough. This method is generally applicable to parts with fewer external leads.

PCB lead welding：

Do not need any connector, as long as the PCB printed circuit board with a wire to the external connection point with the board outside the components or other parts can be welded directly. For example, the speaker in the radio, the battery box, and so on.

The interconnection of the circuit board should be noted when welding:

(1) Welding wire pads should be as far as possible at the edge of the PCB printed board, and arranged according to a uniform size, in order to facilitate welding and maintenance.

(2) In order to improve the mechanical strength of the wire connection and avoid yanking the pads or printed wires off due to pulling on the wires, holes should be drilled in the vicinity of the solder joints on the PCB printed board to allow the wires to pass through the through-holes from the soldering surface of the printed board, and then inserted into the pad holes from the component surface for soldering.

(3) Arrange or bundle the wires neatly and fix them with the board through wire cards or other fasteners to avoid breaking the wires due to movement.

PCB wiring soldering：

Between the two PCB printed circuit boards using the line connection, both reliable and not easy to connect the error, and the relative position of the two PCB printed circuit boards are not restricted. Printed boards are directly welded, this method is commonly used between the two printed boards for the 90-degree angle of the connection. Connected to become a whole PCB printed circuit board components.

Method 2: Plug connection：

In the more complex instruments and equipment, often used plug connection. This "building block" structure not only ensures the quality of the mass production of products, reduce the cost of the system, and for the debugging, maintenance provides a convenient. When the equipment fails, maintenance personnel do not have to check to the component level (i.e., to check the cause of the failure, trace the root cause to specific components. This work takes a considerable amount of time), as long as it is judged to be which board is not normal can be replaced immediately, in the shortest possible time to eliminate the problem, shorten the downtime and improve the utilization of equipment. Replacement of the circuit board can be repaired in plenty of time, repaired as spare parts to use.

Printed board socket：

In the more complex instruments and equipment, this connection is often used. This method is made from the edge of the PCB printed board printed plug, plug part of the socket size, the number of contacts, contact distance, positioning hole location, etc. to design, so that it matches the special PCB printed board socket.

When making the board, the plug part needs to be gold-plated to improve wear resistance and reduce contact resistance. This way of assembly is simple, interchangeable, good maintenance performance, suitable for standardized mass production. The disadvantage is that the cost of the printed circuit board, the printed circuit board manufacturing precision and process requirements are high; reliability is slightly worse, often due to oxidation of the plug part or socket reed aging and poor contact. In order to improve the reliability of the external connection, often the same lead line through the circuit board on the same side or both sides of the contact point parallel lead.

PCB printed circuit board socket connection commonly used in multi-board structure of the product, the socket and the printed circuit board or base plate with reed type and pin type two.

Standard pin connection：

Can be used for the external connection of the printed circuit board, especially in small instruments often used pin connection. Two printed boards are connected by standard pins, which are generally parallel or perpendicular to each other, making it easy to realize mass production.