What is ups? Difference between online and backup

UPS (Uninterruptible Power System/Uninterruptible Power Supply), also known as Uninterruptible Power Supply, is a system equipment that connects a battery (mostly lead-acid maintenance free battery) to the host and converts DC power into mains power through module circuits such as the host inverter. Mainly used to provide stable and uninterrupted power supply to single computers, computer network systems, or other power electronic devices such as solenoid valves, pressure transmitters, etc. When the mains power input is normal, the UPS stabilizes the mains power and supplies it to the load for use. At this time, the UPS is an AC mains power stabilizer, and it also charges the internal battery; When the mains power is interrupted (due to an accident power outage), UPS immediately supplies 220V AC power to the load by inverting the DC energy of the battery through zero switching conversion, maintaining normal operation of the load and protecting the load's software and hardware from damage. UPS equipment usually provides protection against high or low voltage.

UPS is divided into three categories based on its working principle: backup, online, and online interactive. Among them, the most commonly used is the backup UPS, which has the most basic and important functions of UPS such as automatic voltage regulation and power outage protection. Although it generally has a conversion time of about 10ms, due to its simple structure, low price, and high reliability, it is widely used in fields such as microcomputers, peripherals, and POS machines. Backup UPS power supply is divided into backup sine wave output UPS power supply and backup square wave output UPS power supply. Backup sine wave output UPS power supply: The single machine output can reach 0.25KW~2KW. When the mains power changes between 170V~264V, it provides users with mains power processed by a voltage regulator; When the mains power exceeds the range of 170V~264V, UPS provides high-quality sine wave power. Backup square wave output UPS power supply: Unlike backup sine wave output UPS power supply, it only provides users with a 50Hz square wave power supply. Online UPS has a complex structure but complete performance, which can solve all power supply problems, such as the four-way PS series. Its notable feature is that it can continuously output pure sine wave AC power without interruption, and can solve all power supply problems such as spikes, surges, and frequency drift; Due to the need for significant investment, it is usually applied in environments with strict power requirements such as critical equipment and network centers.

Online interactive UPS, compared with backup UPS, has filtering function and strong resistance to mains interference. The conversion time is less than 4ms, and the inverter output is analog sine wave. Therefore, it can be equipped with network equipment such as servers and routers, or used in areas with harsh power environments.