PCB manufacturers tell you how to distinguish between the positive and negative poles of the power supply of the circuit board?

Printed circuit board, referred to as PCB, is the basic component of electronic components, connecting the center. Many people in the disassembled parts, see the circuit board densely packed lines, do not know how to distinguish between positive and negative poles, then the PCB manufacturer editor as a production PCB professionals, now to help you Popular Science, how to distinguish between the power supply of the circuit board positive and negative poles.

First of all, pcb editorial manufacturer to tell you, the designer to design a perfect PCB circuit board, the first thing is to determine the positive and negative poles of the circuit board. In the designer step by step layer by layer design, and consider the matching problem between its individual devices. DC-powered circuit, its power supply is generally divided into single power supply, including power positive and power ground; dual power supply, including power positive and power negative. When distinguishing the positive and negative poles in a circuit can be determined by the following methods.

1, according to the circuit board silkscreen to determine the positive and negative poles

Engineers in the design of the PCB, will dock the interface part of the pin definition with silkscreen marking good for the power supply positive and negative, generally use V + and GND to distinguish between positive and negative power supply. So, first look at the silkscreen on the board, through the content of the silkscreen on the board can learn a lot of information, it is very important to correctly understand the circuit board silkscreen information. As shown in the figure below, what V+ indicates is the positive terminal, and GND is the power supply ground.

2, according to the polarity components to determine the positive and negative poles

Polarity components are polarized and cannot be reversed when used. Commonly used components with polarity are electrolytic capacitors, diodes and so on. So through the polarity of the components can determine the positive and negative circuit. Electrolytic capacitors, for example, its positive pole must be connected to the power supply positive, negative pole must be connected to GND, identify the pins of the capacitor can also determine the positive and negative circuit. Capacitors to determine the positive and negative poles as shown in the figure below.

3, according to the large area of copper to determine the positive and negative poles

In order to improve the anti-interference ability in the design of PCB, reduce the impedance of the ground, will be the ground to large-area copper-coated way to realize the electrical connection, if the circuit board is copper-coated, basically GND as a network of copper-coated, in turn, you can judge the large-area copper-coated is the ground.

4, other ways to confirm the positive and negative poles

Can also be confirmed through the chip pins positive and negative, the chip is required to power supply, power supply pins, if you know the order of the chip pins can be distinguished from the power supply positive and negative, but this method has a drawback, that is, only applies as long as the case of a power supply network, if there are more than one power supply network on the board, you need to go through the above methods to further confirm.

Well, through the above you can learn how to distinguish between positive and negative circuit boards, the current PCB market demand increases, we insist on the first line. Shenzhen Jiubao Technology is a professional PCB circuit board manufacturer, twelve years of PCB production experience, professional mass production, high quality products and services, if you need to contact us +86-755-29717836