江蘇春晨電纜有限公司專業(yè)生產(chǎn)JBHF電機(jī)引接線，

江蘇春晨電纜有限公司：http://wididy.cn/st82365/              Grounding technology has been widely used in the field of modern electronics. Electronic equipment, "the ground" usually has two meanings: one is "the earth" (SAFE), and the other is the "system" (signal). Grounding is a conductive path between the system and a potential reference plane to establish a low resistance. "Earth" is based on the earth's potential as a benchmark, and with the earth as the zero potential, the electronic equipment of the metal shell, the circuit is connected with the ground reference point. As the earth's capacity is very large, generally think that the earth's electric potential is zero. At the beginning, the grounding technology is mainly applied in the power system, and then, the grounding technology extension is applied to the weak current system. In the weak current system, the earth is not generally connected with the earth. For the power electronics equipment will be grounded in the earth or even directly connected in a conductor as a reference potential, when the current through the reference potential, the ground is a common reference point in the circuit, the voltage of this point is 0V, the circuit of the other points are based on the voltage level the reference point for the benchmark, the voltage data are generally marked in the circuit diagram are relative ground size, this can greatly facilitate the repair of voltage measurement. The connection between the same ground is called a ground wire. The ground plane and earth connection, often out of the following considerations: to improve the stability of the equipment circuit system, electrostatic discharge, to provide security for the staff. Ground for the purpose of safety considerations, that is, to protect the ground. Providing a stable zero potential reference point (signal ground or system) for signal voltage shielding.電路系統(tǒng)中的某一點(diǎn)、某一段或某一塊等。當(dāng)該基準(zhǔn)電位不與大地連接時，視為相對的零電位。但這種相對的零電位是不穩(wěn)定的，它會隨著外界電磁場的變化而變化，使系統(tǒng)的參數(shù)發(fā)生變化，從而導(dǎo)致電路系統(tǒng)工作不穩(wěn)定。當(dāng)該基準(zhǔn)電位與大地連接時，基準(zhǔn)電位視為大地的零電位，而不會隨著外界電磁場的變化而變化。但是不合理的工作接地反而會增加電路的干擾。比如接地點(diǎn)不正確引起的干擾，電子設(shè)備的共同端沒有正確連接而產(chǎn)生的干擾。為了有效控制電路在工作中產(chǎn)生各種干擾，使之能符合電磁兼容原則。我們在設(shè)計(jì)電路時，根據(jù)電路的性質(zhì)，可以將工作接地分以下為不同的種類，比如直流地、交流地、數(shù)字地、模擬地、信號地、功率地、電源地等。不同的接地應(yīng)當(dāng)分別設(shè)置。不要在一個電路里面將它們混合設(shè)在一起，例如數(shù)字地和模擬地就不能共一根地線，否則兩種電路將產(chǎn)生非常強(qiáng)大的干擾，使電路陷入癱瘓！

一、接地的類型和作用不同的電路有不相同的接地方式，電子電力設(shè)備中常見的接地方式有以下幾種：

One, the type and function of the grounding of different circuits have different grounding methods, electronic power equipment, common grounding methods are the following:

1、安全接地

1, safety grounding

Safety grounding will be connected to the enclosure of the high voltage equipment. One is to prevent a charge from electrostatic discharge equipment and endanger the personal safety, such as ground computer chassis, tank truck that dragged on the ground of the tail, is to make the accumulation of charge with the release, to prevent accidents; two is when the insulation damage caused when charged shell equipment the action to protect the power supply, and cut off the power supply, in order to protect the safety of staff, such as refrigerators, cooker shell. Three is to shield the device huge electric field, to protect the protection of the role of the transformer, such as the protection of the transformer.

2、防雷接地

2, lightning protection and grounding

When the power electronic equipment in the event of lightning, whether it is direct lightning or induction lightning, if the lack of appropriate protection, power electronic equipment will be greatly damaged or even scrapped. In order to prevent lightning, we usually set the lightning rod and the earth in the high place (for example, the top of the chimney), to prevent the equipment and personnel safety when lightning strikes. Safety grounding and lightning protection and grounding are all in order to provide electronic power equipment or personnel to provide security measures, used to protect the safety of equipment and personnel.

3、工作接地

3, working ground

工作接地是為電路正常工作而提供的一個基準(zhǔn)電位。這個基準(zhǔn)電位一般設(shè)定為零。該基準(zhǔn)電位可以設(shè)為

The work is a reference voltage which is provided for the normal operation of the circuit. This reference potential is generally set to zero. The reference potential can be set as a point in a circuit system, a section or a block, etc.. When the reference potential is not connected with the earth, it is regarded as the relative zero potential. But this kind of relative zero potential is not stable, it will change with the change of the external electromagnetic field, so that the parameters of the system change, which leads to unstable circuit system. When the reference potential is connected with the earth, the reference potential is regarded as the zero potential of the earth, and not change with the change of the external electromagnetic field. But the unreasonable work will increase the interference of the circuit. For example, the grounding is not correctly caused by interference, the common end of the electronic devices are not properly connected to the interference. In order to effectively control the circuit in the work to produce a variety of interference, so that it can meet the principles of electromagnetic compatibility. We are in the design circuit, according to the nature of the circuit, the work can be divided into different types, such as DC, AC, digital, analog, signal, power, power, etc.. Different grounding should be set separay. Do not mix them together in a circuit, for example, digital and analog can not be a common ground, otherwise the two circuits will have a very strong interference, so that the circuit into paralysis!

4、信號

4, signal

信號地是各種物理量信號源零電位的公共基準(zhǔn)地線。由于信號一般都較弱，易受干擾，不合理得接地會使電路產(chǎn)生干擾，因此對信號地的要求較高。

Signal ground is a common datum line of zero potential of all kinds of physical quantity signal source. Because the signal is generally weak, vulnerable to interference, unreasonable to ground will make the circuit interference, so the signal to the higher requirements.

5、模擬地   JBHF電機(jī)引接線

5, simulation

模擬地是模擬電路零電位的公共基準(zhǔn)地線。模擬電路中有小信號放大電路，多級放大，整流電路，穩(wěn)壓電路等等，不適當(dāng)?shù)慕拥貢鸶蓴_，影響電路的正常工作。模擬電路中的接地對整個電路來說有很大的意義，它是整電路正常工作的基礎(chǔ)之一。所以模擬電路中合理的接地對整個電路的作用不可忽視。

Analog ground is a common datum line of analog circuit's zero potential. Analog circuit, there are small signal amplification circuit, multi stage amplifier, rectifier circuit, voltage regulator circuit, etc., is not appropriate to the ground will cause interference, affect the normal operation of the circuit. The grounding in analog circuit is of great significance to the whole circuit. It is one of the basis of the whole circuit. So the function of the whole circuit can not be ignored in the analog circuit.

6、數(shù)字地   

6, digital

數(shù)字地是數(shù)字電路零電位的公共基準(zhǔn)地線。由于數(shù)字電路工作在脈沖狀態(tài)，特別是脈沖的前后沿較陡或頻率較高時，會產(chǎn)生大量的電磁波干擾電路。如果接地不合理，會使干擾加劇，所以對數(shù)字地的接地點(diǎn)選擇和接地線的敷設(shè)也要充分考慮。 

Digital circuit is a common datum line of zero potential. Because the digital circuit works in the pulse state, especially the front and back edge of the pulse can generate a large amount of electromagnetic interference circuit when the front and back edge of the pulse is higher. If the ground is not reasonable, it will aggravate the interference, so the location of the digital earth and the grounding of the laying should be fully considered.電路系統(tǒng)中的某一點(diǎn)、某一段或某一塊等。當(dāng)該基準(zhǔn)電位不與大地連接時，視為相對的零電位。但這種相對的零電位是不穩(wěn)定的，它會隨著外界電磁場的變化而變化，使

7、電源地

7, power supply

電源地是電源零電位的公共

Power supply is the common power supply