What are the correct ways to choose Shanterups power supply?According to the condition of the equipment, the power environment and the purpose of power protection, the suitable UPS can be selected. For example, the backup UPS can be generally used for the small power equipment with built-in switching power supply, and the on-line interactive UPS or on-line UPS should be selected for the place where the power environment is worse, while the on-line UPS can only be used for the equipment that does not allow interruption time or require sinusoidal alternating current at any time. UPS.
First of all, determine how high power your device is. Generally speaking, the power of ordinary PC or industrial computer is about 200 W, the power of Apple computer is about 300 W, and the power of server is between 300 W and 600 W. The power value of other devices can refer to the instructions of the device.
Secondly, there are two ways to show the rated power of UPS: apparent power (unit VA) and practical output power (unit W), which are caused by the existence of reactive power. The conversion relationship between them is: apparent power * power factor = practical output power.
The backup and on-line interactive power factor is between 0.5 and 0.7, while on-line power factor is generally 0.8.
When equipping equipment with UPS, the matching basis should be the actual output power of UPS. Some distributors intentionally or unintentionally confuse the difference between (VA) and (W), which should be brought to the attention of users.
According to the application environment, UPS can be divided into industrial UPS and commercial UPS. Industrial UPS is adapted to the place where the environment is worse, and commercial UPS has higher requirements for the environment.
UPS is usually divided into power frequency machine and high frequency machine. The power frequency machine is composed of SCR rectifier, IGBT inverter, bypass and power frequency boost isolation transformer. Because the working frequencies of rectifiers and transformers are both 50Hz, Wangwenshengyi is called power frequency UPS.
High-frequency machine usually consists of IGBT high-frequency rectifier, battery converter, inverter and bypass. IGBT can control the registration and switching of IGBT by controlling the driver added to its gate. The switching frequency of IGBT rectifier is usually from several KHz to tens of KHz, or even up to hundreds of KHz, which is called high-frequency UPS compared with 50 Hz power frequency.
With the development of power electronics technology and high-frequency power equipment, they are constantly coming out. UPS products in medium and small power sectors are becoming increasingly high frequency. High frequency UPS has the characteristics of high power density, small size and light weight. But in the process of transition from high frequency UPS power band to medium and high power. High-frequency topology UPS exposes some inherent defects in the process of operation, and affects the safe operation and operation of UPS.