How should the UPS uninterruptible power supply be selected?
We must first determine your equipment is much power in general, ordinary PC or IPC power is about 200W, apple at about 300W server between 300W and 600W, the power value of other equipment can refer to the equipment manual.Secondly, should understand the power rating of the UPS has two methods: apparent power (VA) and the actual output power (W), due to the reactive power are so made the difference, the relationship between conversion: apparent power power factor * = actual output power
UPS is usually divided into two types: power frequency machine and high frequency machine. The power frequency machine is composed of thyristor, SCR rectifier, IGBT inverter, bypass and power frequency step-up isolation transformer. Because its rectifier and transformer work frequency are all frequency 50Hz, as the name suggests is "power frequency UPS".High frequency machine usually consists of IGBT high-frequency rectifier converter, battery, inverter and bypass, IGBT can control in the gate driver to control the IGBT turn-on and turn off switching frequency IGBT rectifier, usually in a few tens of KHz to K, even up to hundreds of KHz, compared with the 50Hz frequency, called high frequency UPS.With the development of power electronics technology and high frequency power devices. Small and medium power section of UPS products are gradually high frequency, high frequency UPS has power density, small size, light weight characteristics. But in the high frequency UPS power section, the medium to large power transition is pushed forward. The high frequency topology UPS exposes some inherent shortcomings during use and affects the safe use and operation of UPS.
According to the purpose of power protection equipment, electrical environment and want to achieve, you can select the appropriate UPS; such as small power equipment of switch power supply general can choose the backup UPS, electricity in the relatively harsh environment where should use interactive online or on-line UPS, and intermittent time or time requirements of sine wave AC equipment is not allowed, it can only be used online UPS.
Backup, online interactive power factor between 0.5 and 0.7, the online power factor is generally 0.8.When UPS is allocated to the equipment, the actual output power of UPS should be matched. Some dealers intentionally or unintentionally confuse (VA) and (W), which should be brought to the attention of the user.
UPS battery configuration scheme and UPS uninterrupted power supply method:The battery power supply time is mainly affected by load size, battery capacity, environmental temperature, battery discharge, cut-off voltage and other factors. According to the delay capacity, determine the required size of the battery capacity, ah AH value to represent the number of hours to calculate discharge time given ampere time.
