What is an uninterruptible power supply ? do you know? UPS uninterruptible power supply, in a nutshell, is a constant-voltage constant-frequency uninterruptible power supply that contains an energy storage device with an inverter as its main component. It is mainly used to provide uninterrupted power supply to a single computer, computer network system or other power electronic equipment. Also widely used in mining, aerospace, industrial, communications, defense, hospitals, emergency lighting systems and other fields. Now I will give you detailed information about what uninterruptible power supply is and the related knowledge of uninterrupted power supply.
What is an uninterruptible power supply?
UPS (UninterruptiblePowerSystem/UninterruptiblePowerSupply), which is an uninterruptible power supply, is a system device that connects a battery (mainly maintenance-free lead-acid battery) to a host computer and converts DC power to commercial power through a module circuit such as a host inverter. It is mainly used to provide a stable, uninterrupted power supply to a single computer, computer network system or other power electronic equipment such as solenoid valves, pressure transmitters, etc. When the utility input is normal, the UPS will supply the utility voltage to the load for use. The UPS at this time is an AC mains voltage regulator. At the same time, it also charges the internal battery; when the utility power is interrupted (accidental power failure) At the time, the UPS will immediately supply the 220V AC to the load by switching the DC power of the battery to the load through the inverter zero switching method, so that the load can maintain normal operation and protect the load software and hardware from being damaged. UPS devices usually provide protection against over-voltage or under-voltage.
Uninterruptible power supply features
UPS is aimed at the reliability requirements of China's power grid environment and network monitoring and network systems, medical systems and other power supplies, overcomes the increasingly severe problems of the power supply grid environment caused by the centralized power supply of large and medium-sized computer network systems, and is developed with new digital technologies. The third generation of industrial frequency pure online intelligent UPS. The DC power supply is a device that maintains a constant current in the circuit. Such as dry batteries, batteries, DC generators.
UPS and DC power supply are important power supply support devices for enterprises. The traditional maintenance management includes: 1 The appearance of daily inspections, regular replacement of battery, filter capacitors, fans and other consumables, and battery activation during major repairs; 2 Renovation or replacement of equipment Use advanced tools to test battery performance. This kind of management method has high input costs for enterprises and large workload for maintenance personnel. It is not easy to grasp equipment operation status and key data in real time, and equipment accident prevention capability is low. The implementation of online maintenance management can avoid the deficiencies of the traditional methods and gain good benefits.
UPS in Chinese means "uninterruptible power supply", which is the abbreviation of "UninterruptiblePowerSystem/UninterruptiblePowerSupply" in English. It can ensure that the computer system will continue to work for a period of time after the power outage so that the user can save the data in an emergency so that the user will not affect the work or lose due to the power outage. data.
Uninterruptible power supply advantages
The main advantage of an uninterruptible power supply is its uninterrupted power supply capability. When the mains AC input is normal, the UPS rectifies the AC into DC, and then reverses the DC into a stable, impurity-free AC, which is used by the rear load [2]. Once the mains AC input is abnormal, such as undervoltage or outage, or the frequency is abnormal, then the UPS will enable the backup energy-battery, and the UPS rectifier circuit will be turned off, and accordingly, the DC power of the battery will become stable. Impurities of alternating current continue to be used for the rear load. This is where UPS's uninterrupted power supply comes from. Figure 1 is a typical UPS block diagram.
Of course, the uninterruptible power supply of the UPS is not unlimited. This time is limited by the amount of energy stored in the battery itself [2]. If AC power failure occurs, all you need to do to recover the AC power in the precious time that the UPS battery power supply is, for example, to enable the standby AC circuit and start the generator to generate electricity, it is not enough, you can only save it urgently, save the labor achievement, and wait. After the AC power returns to normal, continue.
Uninterruptible power supply applications
Uninterrupted power supply is now widely used: mines, aerospace, industrial, communications, defense, hospitals, computer business terminals, network servers, network equipment, data storage equipment, UPS uninterruptible power supply, emergency lighting systems, railways, shipping, transportation, Power plants, substations, nuclear power plants, fire safety alarm systems, wireless communication systems, program-controlled switches, mobile communications, solar energy storage conversion equipment, control equipment and their emergency protection systems, personal computers and other fields.
Uninterruptible power supply purchase instructions
1, first of all to determine your device is how much power, in general, the average PC or IPC power is about 200W, the Mac is about 300W, the server is between 300W and 600W, the power value of other devices can refer to the Equipment instructions.
2. Secondly, it is necessary to understand the rated power of the UPS in two ways: the apparent power (unit VA) and the actual output power (unit W). This difference is caused by the presence of reactive power. The conversion relationship between the two is: : apparent power * power factor = actual output power.
3, UPS is usually divided into two types of frequency machine and high frequency machine. The frequency machine consists of thyristor SCR rectifier, IGBT inverter, bypass and power frequency step-up isolation transformer. Because of its rectifier and transformer operating frequency is 50Hz, the name suggests is called industrial frequency UPS.
The high-frequency machine is usually composed of IGBT high-frequency rectifier, battery converter, inverter and bypass. IGBT can control the turn-on and turn-off of IGBT by controlling the drive added to its gate. IGBT rectifier switching frequency is usually several K. To several tens of KHz, even up to hundreds of KHz, compared to 50Hz power frequency, called high-frequency UPS.
Editor's summary: The uninterruptible power supply is characterized by high efficiency, high reliability, high power, modularity, green, energy saving, and environmental protection, so it has a good prospect for development. The current market demand is also expanding and the country has also issued A series of development policies and development plans to encourage the development of the industry.
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