Weak current generally refers to DC circuits or audio and video lines, network lines, and telephone lines, and the DC voltage is generally within 36V. Domestic appliances, such as telephones, computers, and televisions (in cable TV lines) and audio equipment (input lines), are all low-voltage electrical equipment. The weak point is that it is relatively strong. Today, we have summed up our knowledge of weak electricity . The weak current knowledge encyclopedia includes what the weak current is, what are the uses of the weak current, the difference between the weak current and the strong current, and the function and application of the weak current. I believe we will benefit from reading the following introduction.
What is weak electricity?
Weak current generally refers to DC circuits or audio and video lines, network lines, and telephone lines, and the DC voltage is generally within 36V. Electrical appliances such as telephones, computers, and televisions, such as signal input (cable television lines) and audio equipment (output lines), are all weak electrical devices.
What is a weak box?
The weak box, as its name suggests, is a centralized box for weaker voltage circuits and is generally used in modern home renovations such as network cables, telephone lines, computer monitors, USB cables, TV VGAs, chromatic aberrations, antennas, etc. If things are not put in order, they are a mass of lines. They are very chaotic and seem discordant, and they will also affect cleanup. In short, the weak box is used to hold these equipment and cable.
What is a weak cable?
Weak cables refer to cables used for security communications, electrical equipment, and related weak current transmission applications. The brands of weak cables include Ganami, Nutrik, Ling Yu, Tiancheng, Lian Jiaxiang, Akihabara, Di Yi and a boat.
Weak electricity classification
There are two main types of weak electricity in buildings:
The first category is the low-voltage electrical energy, such as safe voltage levels and control voltages specified by the state, which are divided into AC and DC. AC 36V or less, DC 24V or less, such as 24V DC control power supply, or standby power for emergency lighting.
The other type is information sources that contain information such as voice, images, and data, such as telephone, television, and computer information.
The intelligent systems are building equipment automation systems (BA), security systems (SA), communication network systems (CA), office automation systems (OA), automatic fire alarms, and fire-fighting linkage (FA) systems - which we often say The 5A system is an integrated system composed of centralized monitoring, control, and management; all kinds of data collection, control, management, and communication control or network systems in the home are called intelligent lines (that is, home decoration Weak electricity.
The difference between weak electricity and strong electricity
The main difference between strong and weak electricity is the difference in use. Strong electricity is used as a power source and weak electricity is used for information transmission. Specifically, they roughly have the following differences:
(1) Different AC frequencies: The frequency of strong electricity is generally 50Hz (Hz), which is called "power frequency", which means the frequency of industrial electricity: the frequency of weak electricity is often high-frequency or ultra-high frequency, in KHz (kHz). MHz (megahertz).
(2) Different transmission methods: Strong electricity is transmitted on transmission lines, and transmission of weak electricity is divided into wired and wireless. The radio transmits electromagnetic waves.
(3) Different sizes of power, voltage and current: Strong electric power is measured in KW (kilowatts) and MW (megawatts), voltage is measured in V (volts), KV (kilovolts), and current is A (ampere) and kA (thousands) A) The weak electric power is measured in W (watts) and mW (milliwatts), the voltage is measured in V (volts), mV (millivolts), and the current is measured in mA (milliampere) and uA (microampere). Circuits can be constructed with printed circuits or integrated circuits.
Of course, there are also high-frequency (hundreds of KHz) and medium-frequency devices in high-power systems, but the voltage is high and the current is large. Another example is that flashlights and electric razors, while having a very low voltage and very low power and current, are still powerful. Due to the development of modern technology, weak electricity has penetrated into the field of strong electricity, such as power electronic devices, wireless remote control, etc., but these can only be regarded as a weak electric control part in strong electric power, and it is still different from the controlled strong electric power.
Weak power function and application
Power applications can be divided into two categories, strong and weak, according to the strength of power transmission. Electricity for buildings and buildings generally refers to the exchange of strong electricity at 220V 50Hz and above. Mainly provide people with electricity and energy, and convert electrical energy into other energy sources, such as air-conditioning power, lighting power, power power, etc.
Under normal circumstances, weak system engineering refers to the second type of application. Mainly include: 1, television signal engineering, such as television monitoring systems, cable television. 2, communications engineering, such as telephone. 3, intelligent fire engineering. 4. Sound reinforcement and sound engineering, such as background music broadcasting in the community, background music in buildings. 5, integrated wiring works, mainly used for computer networks.
The weak current system is mainly aimed at buildings, including buildings, communities, airports, docks, railways, and highways.
Common weak current systems include: closed-circuit television monitoring systems, burglar alarm systems, access control systems, electronic patrol systems, parking management systems, video intercom systems, home intelligence systems and security systems, background music systems, LED display systems, Plasma splicing screen system, DLP large screen system, three-table copying system, building automation system, lightning protection and grounding system, paging intercom and professional intercom system, weak current piping system, UPS uninterruptible power supply system, computer room system, comprehensive Cabling system, computer LAN system, property management system, multi-functional conference room system, cable television system, satellite television system, satellite communication system, fire protection system, telephone communication system, hotel management system, video on demand system and so on.
Weak wiring
It is a shared network, telephone, cable television and other resources. It is best that the main room has all three interfaces. Network, telephone, and cable TV households are generally divided into four devices (more and more, more expensive). If it is a two-bedroom office, it can be used in the living room, master bedroom, secondary bedroom, telephone, and TV interface. , The restaurant stays on the TV interface, and the bathroom stays on the phone interface. If there are more rooms, you can choose to reserve; you can also run the lines out first and place them in the weak electricity distribution box. If necessary, you can replace the plugs that lead to each room. Audio and video are different. Although they can be divided and shared, they can only provide signals for one terminal at home at the same time.
To achieve the sharing and interoperability requirements for weak wiring, it is necessary to use frequency division or switching equipment. The internal and external network switching equipment of the network is a router (for LAN) or a modem (for ADSL). That is, the cat weak line should use star-type wiring, and radiate from the exchange and frequency dividing device to each port. Considering the simple construction of the wiring and the ease of maintenance, it is best to place various equipment in the same place.
Weak electrical wiring should use special plugs and sockets. The network cable uses RJ45 head (also called amp head/crystal head) and RJ45 head panel and module; the telephone line uses RJ11 head and corresponding socket; RJ45 head installs With dedicated line pliers and cable ties, the cable in the cassette should be left with a head of about 10 centimeters when wiring. If an error occurs when the plug is connected, it can be recovered.
Editor's summary: The above is the introduction of relevant knowledge of the weaker knowledge Daquan that the rookie must understand, and hopes to help the friends who have this need! For more information, please continue to pay attention to our website, follow-up will show more exciting content.
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