The inverter includes a rectifier circuit and an inverter circuit, and the input communication electricity is converted into DC voltage through the rectifier circuit and flat-wave circuit, and then through the difference between strong and weak current, it is mainly reflected in the different uses. Strong electricity is used as a kind of power power, and weak electricity is used for information transmission. In detail, they differ as follows:
(1) The frequency of communication is different
The frequency of strong electricity is generally 50Hz (hertz), called "power frequency", which means the frequency of industrial electricity: the frequency of weak electricity is often high frequency or ultra-high frequency, measured in KHz (kilohertz) and MHz (megahertz).
(2) The transmission mode is different
Strong electricity is transmitted by transmission lines, and weak current is transmitted by wired and wireless. Radios transmit electromagnetic waves.
(3) The power, voltage and current are different
The strong current power is measured in KW (kilowatts), MW (megawatts), the voltage is measured in V (volts) and KV (kilovolts), and the current is measured in A (amperese) and kA (kiloamperes); The weak current power is measured in W (watts) and mW (milliwatts), the voltage is measured in V (volts) and mV (millivolts), and the current is measured in mA (milliamps) and uA (microamps), so the circuit can be composed of printed circuits or integrated circuits.
Of course, there are also high-frequency (hundreds of KHz) and medium-frequency devices in strong electricity, but the voltage is higher and the current is also larger. For example, flashlights and electric shavers are still strong electricity even though the voltage is very low, and the power and current are very small. Because of the development of modern skills, weak electricity has penetrated into the category of strong electricity, such as power electronic devices, wireless remote control, etc., but these can only be counted as the weak current control part of strong electricity, which is still different from the controlled strong current.
Electronics are divided into two parts: strong electricity (electricity) and weak electricity (information). The two are both related and different, generally speaking, the processing object of strong electricity is power (electricity), which is characterized by high voltage, high current, high power, low frequency, the primary consideration is to reduce loss, improve power, the processing object of weak current is first and foremost information, that is, the transmission and control of information, which is characterized by low voltage, small current, small power, high frequency, the primary consideration is the effect of information transmission, such as the fidelity, speed, breadth, and reliability of information transmission. Generally speaking, weak current engineering includes television engineering, communication engineering, fire engineering, security engineering, imaging engineering, etc., as well as integrated wiring engineering for the above projects. Weak electricity is for strong electricity. Strong current = (380/220), high voltage does not matter
In the power system, the voltage below 36V is called the safety voltage, the voltage below 1KV is called low voltage, the voltage above 1KV is called high voltage, and the line that directly supplies power to the user is called the distribution line, if the user voltage is 380/220V, it is called the low-voltage distribution line, which is also the strong electricity in the home decoration (because it is the highest voltage used in the family). Strong electricity generally refers to the communication voltage above 24V. For example, the voltage of electric lights and sockets in the home is 110V-220V. Lighting fixtures, electric water heaters, heaters, refrigerators, televisions, air conditioners, audio equipment and other electrical appliances in household appliances are all strong electrical equipment.
The intelligent system is a comprehensive system composed of building equipment monitoring system, security prevention system, communication network system, information network system, automatic fire alarm and fire linkage system, etc., with the intention of gathering supervision, control and management; The control or network system of various data collection, control, management and communication in the family is called an intelligent line (that is, the weak current in home decoration). Weak current generally refers to DC circuits or audio, video lines, network lines, telephone lines, DC voltage is generally within 24V. Telephones, computers, televisions, signal input (cable TV lines), audio equipment (output lines) and other electrical appliances in household electrical appliances are weak current electrical equipment.
Conceptually speaking, strong electricity and weak electricity are generally simple differences, and the primary difference is the difference in use. Strong electricity is used as a kind of power power, and weak electricity is used for information transmission. In detail, they differ as follows:
(1) The frequency of strong electricity with different communication frequencies is generally 50Hz, which is called "power frequency", that is, the frequency of industrial electricity; The frequency of weak current is often high frequency or ultra-high frequency, measured in kilohertz (KHz) and megahertz (MHz).
(2) The transmission mode is different
Strong electricity is transmitted by transmission lines, weak electricity is transmitted by wired and wireless, and radio is transmitted by electromagnetic waves.
(3) The power, voltage and current are different
STRONG CURRENT POWER IS MEASURED IN KILOWATTS (KW) AND MEGAWATTS (MW), VOLTAGE IS MEASURED IN VOLTS (V) AND KILOVOLTS (KV), AND CURRENT IS MEASURED IN AMPERES (A) AND KILOAMPERES (KA); Weak current power is measured in watts (W) and milliwatts (mW), voltage is measured in volts (V) and millivolts (mV), and current is measured in milliamperes (mA) and microamperes (μA), so its circuit can be composed of printed circuits or integrated circuits.
Of course, there are also high-frequency (megahertz) and medium-frequency devices in strong electricity, but the voltage is higher and the current is also larger. For example, flashlights and electric shavers are still strong electricity even though the voltage is very low, and the power and current are very small. Because of the development of modern skills, weak current has penetrated into the category of strong electricity, such as power electronic devices, wireless remote control, etc., but these can only be counted as the weak current control part of strong electricity, which is still different from the controlled strong current.
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