UPS is converted into DC, and then divided into two paths. One way is to charge the battery, and the other way is to switch back to alternating current to supply power to the electrical equipment. When the quality of mains power supply is unstable or power is cut off, the battery will switch from charging to power supply until the mains power returns to normal. "UPS participates in the whole process of power consumption." Its advantage is that the output waveform is sine wave like the mains, pure and noiseless, and is not affected by the instability of mains. It can supply power to "inductive loads" such as electric fans. As long as the output power of UPS is sufficient, it can supply power to any equipment that uses commercial power. In recent years, major overseas power suppliers are gradually optimistic about China's power electronic power supply market, and turn their attention to the mainland of China. UPS power products include Suntech, APC, Exeter, Meilan Rilan and Mitsubishi. In terms of communication switching power supply, there are Ericsson, Siemens, American Vicor, Tencent Technology, Lucent and Japan New Battery. Power supply manufacturers in Taiwan Province province of China also set up factories in mainland China. For example, Delta has set up factories in Dongguan, Shanghai and Tianjin.
Nowadays, multinational companies dominate the domestic power market, such as Emerson, APC, Meilan Rilan, Eaton Axel and so on. Recently, they have entered the domestic market, such as Dutch Heitek Company, ActivePower Company and S&C Shien Electric Company. China has also formed a number of power supply enterprises with over 100 million yuan, such as ZTE, Xiamen Ke Hua, Wuhan Intercontinental and Yantai Oriental Electronic Information Group. They have strong technical strength and development ability. UPS power supply technology is also developing in the direction of multi-function, high power and integration. Among them, Xiamen Ke Hua, Champion, Costar, Eslite, Jieyida and other private enterprises in the UPS power industry lead the domestic UPS market.
Power electronic power supply is mainly classified by product name, 1 category: switching power supply, including AC /DC switching power supply, AC /DC switching power supply, charger, etc. Category 2: Uninterruptible Power Supply (UPS), including ACUPS and DCUPS. The third category: inverters, including ordinary inverters, LCD backlight inverters, solar inverters, etc. The fourth category: frequency converters, including ordinary frequency converters and high-voltage frequency converters. Category V: Others such as AC regulated power supply, intermediate frequency induction heating power supply, high voltage power supply and electric locomotive power supply.
The Ministry of Science and Technology has set up a special fund of 200 million yuan for power electronics projects, and the National Development and Reform Commission has issued a special document to promote the development of power electronics technology and industry. Including the industrialization of application devices, supporting the application of power electronic devices with independent intellectual property chips and technologies around the needs of energy saving, transportation, electric power, metallurgy and other fields. Energy-saving uninterruptible power supply and new power optimization device are obviously typical support objects. In all energy applications, more than 70% need to pass through power electronic conversion devices and then give them to the load. Power electronic power supply is a powerful means to save energy and reduce emissions, and it is also the cornerstone to ensure information security and industrial automation. For example, the application of frequency converter will greatly save energy for motor load, and the application of UPS will effectively ensure the reliable operation of information equipment and the improvement of industrial manufacturing level. Switching rectifier is the energy heart of all networks and communication systems. The development of information and industrial automation level is closely related to the development of power electronic power supply technology. The equipment technology of UPS power supply system refers to the comprehensive technology relying on advanced power conversion technology, digital control technology, high-frequency switching technology, pulse width modulation technology, electromagnetic compatibility technology, redundant parallel technology, intelligent charging and discharging technology, network technology, driving technology and new technology.
UPS power supply has developed from a rotating generator in the 1960s to an intelligent static all-electronic circuit today, and it is still developing. UPS power supply generally refers to static UPS power supply, which can be divided into three categories according to its working mode: standby, online interaction and online. According to the power of UPS and its application fields, there are several classification methods as follows: 1. According to the classification of UPS power supply, UPS power supply system can be divided into three sub-categories according to its applied power. Low-power UPS power supply system is defined as: UPS power supply products with power less than 3kVA; Medium-power UPS power supply system is defined as: UPS power supply products with more than or equal to 3kVA and less than 10kVA; A high-power UPS power supply system is defined as a UPS power supply product greater than or equal to 10kVA. 2. Classification by UPS application field: UPS power system equipment for information equipment. In recent years, UPS power supply system plays an increasingly important role in IT industry, and is known as the patron saint of computer information. After the world entered the information age, information security has been widely concerned by people. Therefore, under this background, it is logical that the development trend of UPS is highly concerned by the industry. Information and communication UPS power supply system is mainly used for the security protection of computer information system, communication system and data network center in information industry, IT industry, transportation, finance industry and aerospace industry. As an important peripheral equipment of computer information system, communication system and data network center, UPS power supply is very important in protecting computer data, ensuring the stability of power grid voltage and frequency, improving power grid quality, and preventing the harm caused by instantaneous power outage and unexpected power outage to users.
Industrial power supply UPS power supply system equipment. Industrial power UPS power supply system equipment is mainly used in: industrial power equipment industry, electric power, steel, nonferrous metals, coal, petrochemical industry, construction, medicine, automobile, food, military and other fields. As AC and DC uninterruptible power supply equipment, it is used in all power automation industrial system equipment, remote execution system equipment, high-voltage circuit breakers, relay protection, automatic devices, signal devices and so on. To ensure the reliability of industrial automation power supply. Industrial uninterruptible power supply is a high-end product among uninterruptible power supply products, involving power electronics technology, digital control technology, parallel redundancy technology of AC power supply, active harmonic suppression technology, high-power product manufacturing technology and so on. Obviously, ordinary power supply enterprises cannot enter this field. Only those enterprises that have developed, produced and served high-power power electronic technology and series products and accumulated corresponding industrial application experience can do a good job in the design, production and market service of industrial uninterruptible power supply system. The UPS power supply used by traditional UPS manufacturers in these places is often a UPS power supply product that adapts to the industrial natural environment, rather than an uninterruptible power supply for real industrial electrical equipment that adapts to the industrial electrical environment and inductive power load characteristics.