PCB Technical - Multi-layer circuit boards and single-layer circuit boards

According to the number of circuit boards, circuit boards are divided into three categories: single-sided, double-sided and multilayer circuit boards.

First, the single board is concentrated on one of the leads of the most basic PCB part. Because the wires only appear on one of the sides, it is called a single-sided circuit board. Single-sided boards are usually simple and low-cost, but the disadvantage is that they cannot be applied to overly complex products.

The double-sided board is an extension of the single-sided board. When single-layer cables cannot meet the needs of electronic products, double-sided panels must be used. Both sides are covered with copper wires, and two layers of wires can be introduced through the holes to form the required network connection.

Multi-layer board refers to the mutual compression of more than three conductive pattern layers and the insulating material between them, and the conductive patterns need to be connected. Multilayer circuit boards are the product of the development of electronic information technology in the direction of high-speed, multi-function, large-capacity, small volume, thinness and light weight...

Circuit boards are divided into flexible boards (FPC), rigid boards (PCB), and rigid-flex boards (FPCB) according to their characteristics.

1. Pick it up and point to the core of the lamp, that is, they are all black. On the contrary, the multi-layer board is a single-sided board, and the single-sided board has only one layer of wires. There is no copper in the cave. The double-sided board has a line on the front and back, and there is copper in the through hole.

The most fundamental difference is that the number of lines is different.

A single-layer circuit board has only one layer of circuits (copper). All holes are non-metallic holes and there is no electroplating process.

The double-layer circuit board has two layers of circuits (copper), metal holes and non-metal holes.

3. Circuit boards are divided into single-sided circuit boards, double-sided circuit boards and multilayer circuit boards. The production process of multilayer circuit boards will increase the inner layer compression process according to single-sided and double-sided boards. You can also use slices to analyze it.

These electronic products need integrated circuits to save space and make the products lighter and more durable/better. The previous wire connection must be eliminated and then converted to a printed circuit board. PCB has good space/performance and reliability.

Not every appliance needs a circuit board. Simple appliances do not require motors. However, electrical appliances with specific functions usually require circuit boards to implement a large number of TVs, radios, computers, and so on. There is also a speed controller in the PCB board fan at the bottom of the rice cooker.

PCB generally refers to hard circuit boards, such as computer motherboards, mouse boards, graphics cards, office equipment, printers, copiers, shaking controllers, various chargers, calculators, etc. Digital cameras, radios, televisions, motherboards, limited TV amplifiers, mobile phones, washing machines, electronic balances, telephones, LED lights, household appliances: air conditioners, refrigerators, stereos. MP3, industrial equipment, GPS, automotive equipment, medical equipment, aircraft, military, etc. There is also an APCB. The circuit board is also very soft. For example, the circuit between the flip phone connection cover and the key is a flexible circuit board.

The button board of the mobile phone main board is a hard board; the connection cable of a sliding phone or a flip phone is a soft board. The remote control usually uses a carbon film board. The mobile phone panel is the logic circuit of the radio frequency circuit and the audio circuit.

Under normal circumstances, only the heated hot water bottle is directly connected without the circuit board wire bracket. The water dispenser has a circuit board. Rice cookers usually have circuit boards. The induction cooker has a circuit board. There is a circuit board in the fan, but in general, functions such as speed regulation and timing display have no actual effect on the operation of the fan.

It mainly depends on whether the double-layer board can meet the requirements of anti-interference ability, EMC and other performance double-layer boards.

In daily life, multi-layer steel plate is the most commonly used type of circuit board. So, what are the application advantages of multi-layer PCB circuit boards?

Application advantages of multi-layer PCB circuit boards.

1. The assembly density is high, the volume is small, and the weight is light, which can meet the needs of electronic equipment.

Due to the high assembly density, the connection between each component (including components) reduces the simplicity and reliability of installation.

Due to the repeatability and consistency of the graphics, errors in wires and assembly are reduced, and the maintenance, debugging and inspection time of the equipment is saved.

4The number of distribution layers can be increased, and the flexibility of design can be increased.

5. A circuit with a certain impedance can form a high-speed transmission circuit.

6. The circuit magnetic circuit shielding layer can be set, and the metal core heat dissipation layer can meet special functions such as shielding and heat dissipation..

With the continuous development of electronic technology and the increasing requirements for electronic equipment in industries such as computer, medical and aviation, the forward volume of circuit boards has decreased and the density has increased. Due to the limitation of available space, single-sided and double-sided printed boards cannot further improve the assembly density, so it is necessary to consider multilayer circuit boards with higher assembly density. Multilayer circuit boards have been widely used due to their flexible, stable and reliable electrical performance and excellent economic performance.