New Overview of UPS

News 2023年7月13日 52


UPS uninterruptible power supply is to connect the battery with the host, the inverter and other module circuits will convert DC into the mains equipment, is usually used to provide stable, pure and uninterrupted electric energy to the computer and computer network system or pressure transmitter, solenoid valve and other power equipment. The UPS uninterrupted power supply can protect it when the system voltage is high or low. In the event of mains outage, UPS can provide backup power to avoid reduced efficiency, and prolong the service life of the equipment to prevent damage due to voltage changes.

When the mains is normal, the UPS uninterrupted power supply can also filter the negative factors affecting the power quality, and timely provide pure sine wave voltage for the subsequent input equipment. At present, UPS uninterruptible power supply adopts digital control technology, high-speed main controller and programmable logic devices, low-loss and high-power insulated gate bipolar transistors and static switch, which can adapt to the complex power grid environment, and can set the working state according to the user’s power needs.

Development history of UPS uninterruptible power supply

The UPS uninterruptible power supply was launched in Los Angeles in 1903, and China’s first UPS was rolled off the production line in 1978. The development of UPS UPS has gone through the following stages.

First-generation UPS uninterrupted power supply—— dynamic UPS

The first generation of UPS uninterruptible power supply provides a short-term supply of uninterrupted electric energy through mechanical energy inertial storage and energy transmission of motor and generator. Its large size, high price, high noise, not easy to maintain and operate, and was replaced by a new product after a period of time.

Second-generation UPS uninterruptible power supply—— power frequency UPS

Compared with the first generation dynamic UPS, the performance of the second generation UPS is mainly improved in the following aspects: first, the total volume decreases and the difficulty of transportation and construction is reduced; second, the power backup time is determined by the backup battery capacity, upgraded from the dynamic UPS second reserve to the hour reserve; third, the power quality can be optimized to input stable electric energy to the back-end equipment when the power grid fluctuates greatly. However, the power frequency UPS still has deficiencies: first, the transportation and construction problems, due to the large to pass through the door and the elevator transportation; the second, the host adopts similar black box design, failure can only return to the factory for maintenance, users cannot directly open the operation, resulting in slow fault response. At present, the power frequency UPS uninterruptible power supply often functions in the case of high power and poor power quality.

Third-generation UPS uninterruptible power supply——high-frequency UPS

The emergence of high-frequency UPS uninterruptible power supply further increases the power, reduces the system volume by nearly half, and effectively improves the convenience of construction. Meanwhile, the integrated design can improve the maintenance efficiency, reduce the average recovery time, and can be completed in several hours. The total input harmonic distortion rate can reach below 5%, significantly reducing the harmonic pollution of the power grid; the efficiency is further improved to 92%, reflecting its energy saving advantage.

The fourth-generation UPS uninterruptible power supply —— modular high-frequency UPS

The emergence of high frequency UPS uninterruptible power supply lays the technical foundation for the modular architecture of UPS. Through the power supply architecture of modular technology similar to communication power supply, the modular high frequency UPS technology can be realized. Its performance improvement is mainly manifested in the following aspects: First, the reliability has been greatly improved, and the full modular solution solves the problem of a single fault point. Secondly, the commercial value is obvious. The overall modular design improves the UPS work efficiency, and makes full use of the dormancy function of the communication power supply to keep the UPS system in the best operating state. Thirdly, in terms of maintenance, the requirements for technical expertise have also been greatly reduced. For the modular UPS with a capacity below 50 kVA, the hot swap technology enables the operators to maintain online, and the fault repair time is reduced to minutes. The module UPS with a capacity of 200 kVA and above, due to the module isolation technology, cannot hot swap, but operators can maintain and find faults through online dividing and closing modules, which greatly reduces the repair time, and configure redundant modules to ensure the capacity availability. Finally, the different units are modular and removable for easy transportation and construction. Compared with other generations of products, the modular high-frequency UPS uninterruptible power supply has higher power density, easier to maintain and more convenient to use.