Three ways to compare the three ways of PCB.multilayer pcb manufacturing process_Shenzhen StarLight Industrial Development Co., Ltd.

Three ways to compare the three ways of PCB.multilayer pcb manufacturing process

source:News release time:2023-04-06 Hits: Popular:PCB Assembly company: Share:

　　In order to prevent the safety of electrical shocks or protective equipment, PCB grounded, the metal chassis or shell of the equipment and other equipment is connected to the ground line; the ground is used as a current circuit ground. In the power system, the neutral point, shell, or bracket and grounding device of the device and electric devices are called ground with a conductor with conductors. In addition to the use of some useless current or noise interference to the earth, the maximum function is to protect users from being shocked. In terms of UPS, some UPS will marked the voltage between the zero line and the ground line to ensure that the product is not not Can cause electric shock damage to the human body.

　　1. Single -point ground

　　Low -point work frequency (<1MHz) uses a single -point grounding type (that is, the entire circuit system>

　　2. More ground ground

　　Multi -point grounding type with a high frequency (> 30MHz) is high (that is, in this circuit system, with a ground -flat plate instead of each part of the circuit in the circuit). Because the sensory resistance of the grounding lead is proportional to the frequency and length, the common ground impedance when the operating frequency is high, which will increase the electromagnetic interference generated by the co -ground impedance, so the length of the ground line is required to be as short as possible. When using a multi -point ground, try to find the closest low -resistance ground ground ground.

　　3. Mixed ground

　　The operating frequency of 1 to 30MHz is a mixed ground type. When the length of the ground line is less than 1/20 of the working signal wavelength, a single point ground type is used, otherwise multi -point grounding is used.

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