What is UPS? What is the use of uninterruptible power supply? Types of UPS (uninterruptible power supply)
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What is UPS? What is the use of uninterruptible power supply? Types of UPS (uninterruptible power supply)

Posted Date: 2024-01-19

UPS is the abbreviation of Uninterruptible Power Supply. It is an electronic device used to supply power to other devices (such as computers, communication equipment, etc.) during power outages.

The rectifier in the UPS converts alternating current into direct current, which is then stored in the battery. This process continues when AC power is turned on. When there is a power outage, the inverter converts the DC power into the AC power required for the equipment to operate.

The meaning of UPS:

1.Protect critical equipment: For many businesses and organizations, the proper functioning of critical equipment (such as servers, network equipment, communications equipment, etc.) is crucial. Once these devices stop working due to power outage, it may lead to data loss, system crash or even production stagnation, causing huge economic losses to the enterprise. A UPS reduces these risks by ensuring that critical equipment continues to operate during power outages.

2.Extended equipment life: Power outages can cause equipment to start and shut down suddenly, which can cause a significant impact on the device's electronic components and shorten the life of the device. UPS can provide stable power to equipment during power outages, reducing the number of startups and shutdowns of equipment, thereby extending the service life of equipment.

3.Increased data security: Power outages can lead to data loss or corruption, especially if there is no backup. UPS can provide temporary power to critical equipment, giving users enough time to save data to other storage media, thereby ensuring data security.

4.Improve business continuity: For many businesses and organizations, business continuity is critical. UPS can ensure that critical equipment continues to operate during power outages, thereby ensuring business continuity and avoiding production stagnation or service interruptions caused by power outages.

5.Saving energy: Although UPS consumes a certain amount of electricity, it can reduce the energy consumption of equipment through effective management of electricity. For example, when the power grid fluctuates, the UPS can automatically adjust the output voltage to allow the equipment to operate in optimal conditions, thereby reducing energy consumption.

UPS type:

1.Online UPS: Online UPS is the most commonly used type of UPS, which integrates the battery and inverter into a single chassis. When the online UPS is working normally, it converts the mains power into DC power, and then converts the DC power into AC power through the inverter to supply the equipment. When the mains power is interrupted, the online UPS will immediately switch to battery power supply mode to ensure that the equipment continues to operate. The conversion time of online UPS is very short, usually within a few milliseconds, so the protection effect on the equipment is very good.

Working principle of online UPS power supply

2.Offline UPS: Offline UPS places the battery and the inverter separately, and the inverter is responsible for converting the mains power into alternating current to power the equipment. When the mains power is interrupted, the offline UPS will immediately switch to battery power mode. The conversion time of offline UPS is relatively long, usually between a few seconds and tens of seconds. Offline UPS is usually used for equipment that does not require high power quality, such as home computers, printers, etc.

3. Backup UPS: Backup UPS directly provides AC power to the equipment connected to the load. When the power fails, the backup UPS will change the position of the transfer switch. It connects the load to the battery backup path.

Backup UPS

The batteries of backup UPS are charged when AC power is available. In this case, the AC power is input directly into the load circuit and the battery of the backup UPS is charged through the rectifier circuit.

4. Online interactive UPS: Online interactive UPS is similar in structure to backup UPS. The only difference between them is that the line interaction includes an automatic voltage regulator along with EMI and RFI filters. Automatic voltage regulators eliminate voltage fluctuations while suppressing voltage fluctuations.

In short, UPS, as a key power protection system, is of great significance in ensuring the normal operation of key equipment, protecting data security, and improving business continuity. Different types of UPS have different performance and application scenarios. Users should choose the appropriate UPS product according to their own needs.

With the development of science and technology and the increase in power demand, the stability and reliability of power supply are facing increasing challenges. In this case, the importance of UPS as an effective power protection method is self-evident. By understanding different types of UPS, we can better select and use UPS products to provide reliable power protection for key equipment of enterprises and organizations.

When choosing a UPS, users need to consider the following aspects:

1.Load capacity: Users need to choose the appropriate UPS capacity based on the power and quantity of the equipment. Generally speaking, the larger the load capacity, the longer the UPS battery life. However, UPSs with excessive load capacity are more expensive and larger in size, making them inconvenient to install and maintain.

2.Conversion time: Conversion time refers to the time from the interruption of mains power to the start of power supply by UPS. The shorter the conversion time, the better the protection of the equipment. The transfer time of an online UPS is usually within a few milliseconds, while the transfer time of an offline UPS can be longer.

3.Battery type: The battery is one of the core components of the UPS, and its performance directly affects the battery life and service life of the UPS. Common battery types currently on the market include lead-acid batteries and lithium-ion batteries. Lithium-ion batteries have longer service life and higher energy density, but are more expensive; lead-acid batteries are less expensive, but have a shorter service life.

4.Functions and characteristics: Different types of UPS have different functions and characteristics, and users need to choose the appropriate functions and characteristics according to their own needs. For example, double-conversion online UPS has higher stability and protection performance and is suitable for key equipment with high power quality requirements; while emergency power supply is suitable for portable equipment with low power quality requirements.

5.Brand and after-sales service: Choosing UPS products from well-known brands can ensure the quality and performance of the product. In addition, good after-sales service is also one of the factors that users need to consider when choosing UPS. Users can learn about the brand’s after-sales service by checking product reviews and consulting with sales staff.

In short, UPS, as a key power protection system, is of great significance in ensuring the normal operation of key equipment, protecting data security, and improving business continuity. When selecting and using a UPS, users need to select the appropriate product type and specifications based on their own needs and actual conditions to ensure that key equipment can continue to operate normally when power is interrupted.


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