What are offline UPS and online UPS?

In the era of rapid development of modern science and technology, people have increasing demands for the stability of power supply. Offline UPS and online UPS are two common uninterruptible power supply systems. They provide us with stable power guarantee in different scenarios. However, many people may not be clear about the working principles and differences between the two UPS systems. This article will introduce you to the concepts, characteristics and applicable scenarios of offline UPS and online UPS in detail.

1. What is offline UPS?

Offline UPS is an uninterruptible power supply system based on direct current (DC) - alternating current (AC) conversion. Its working principle is that when the mains power supply is normal, the AC power is directly transferred to the output terminal through automatic bypass, and the built-in rechargeable battery is used as a backup power supply; when the mains power is cut off, the system will immediately switch to battery power supply to Keep the output voltage stable.

2. Characteristics of offline UPS

- Low cost: Compared with online UPS, offline UPS has lower cost and is suitable for general homes or offices.

- Long switching time: When the mains power is outage, the offline UPS needs to switch. The switching time is long, which may cause a short power interruption.

- Applicable scenarios: Suitable for scenarios where power supply requirements are not particularly strict, such as personal computers, small network equipment, etc.

3. What is online UPS?

Online UPS is an uninterruptible power supply system based on double conversion. Its working principle is to convert the mains DC power into AC power, supply it to the device through the AC output terminal, and at the same time supply the power to the built-in rechargeable battery for charging; when the mains power fails, the system will continue to supply power from the battery without switching time to maintain the stability of the output voltage.

4. Features of online UPS

- High stability: The online UPS system is always online under normal and abnormal conditions of the mains power supply. The output voltage is stable and the equipment protection is more reliable.

- Seamless switching: Since the system is always online, there is no need to switch when the mains power is out, maintaining the continuity of power supply.

- Applicable scenarios: Suitable for scenarios with very strict power supply requirements, such as data centers, medical equipment, etc.

5. Choice of offline UPS and online UPS

- Choose according to your needs: Choose a suitable UPS system based on your actual needs and budget.

- Importance considerations: If the stability of the power supply is required, it is recommended to choose an online UPS system; if the impact of power interruption is small, you can consider choosing an offline UPS system.

Offline UPS and online UPS are two common uninterruptible power supply systems. They have their own characteristics, advantages and disadvantages in different scenarios. Choosing a UPS system that suits your needs can effectively ensure the normal operation of the equipment, improve work efficiency, and ensure the continuity of life and work. I hope this article can help readers understand the concepts and characteristics of offline UPS and online UPS more clearly, and provide a reference for the correct selection of UPS systems.