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Type of Uninterruptible Power Supply
UPS is divided into three types according to the working principle: backup, online and online.
1. Backup UPS: When the utility power is normal, the utility power supplies power directly to the load. When the utility power exceeds its working range or power failure, it is converted into battery inverter power supply through the transfer switch. The utility model has the advantages of simple structure, small volume and low cost, but the input voltage range is narrow, the output voltage stability and precision are poor, there is switching time, and the output waveform is generally a square wave.
2. Online interactive UPS: When the mains is normal, the mains supply power directly to the load. When the mains is low or high, the output is regulated by the internal UPS voltage regulator. When the mains is abnormal or the power is cut off, The transfer switch is switched to battery inverter power supply. Its characteristics are: wide input voltage range, low noise, small size, etc., but there is also switching time
3. When the mains UPS is normal, the mains is rectified to provide DC voltage to the inverter, and the inverter supplies AC to the load. When the mains is abnormal, the inverter supplies energy from the battery, and the inverter The unit is always active and guarantees uninterrupted output. The utility model has the advantages of wide input voltage range, no switching time and high output voltage stability, and is particularly suitable for occasions with high power requirements, but the cost is high. At present, UPS with power greater than 3KVA is almost all online UPS.
The online UPS structure is complex, but the performance is perfect, can solve all power problems, such as the four-way PS series, its remarkable feature is that it can output pure sine wave AC continuously with zero interruption, and can solve all the peaks, surges, frequency drifts, etc. Power problems; due to the need for large investments, they are often used in power-critical environments such as critical equipment and network centers.
1. Backup UPS: When the utility power is normal, the utility power supplies power directly to the load. When the utility power exceeds its working range or power failure, it is converted into battery inverter power supply through the transfer switch. The utility model has the advantages of simple structure, small volume and low cost, but the input voltage range is narrow, the output voltage stability and precision are poor, there is switching time, and the output waveform is generally a square wave.
2. Online interactive UPS: When the mains is normal, the mains supply power directly to the load. When the mains is low or high, the output is regulated by the internal UPS voltage regulator. When the mains is abnormal or the power is cut off, The transfer switch is switched to battery inverter power supply. Its characteristics are: wide input voltage range, low noise, small size, etc., but there is also switching time
3. When the mains UPS is normal, the mains is rectified to provide DC voltage to the inverter, and the inverter supplies AC to the load. When the mains is abnormal, the inverter supplies energy from the battery, and the inverter The unit is always active and guarantees uninterrupted output. The utility model has the advantages of wide input voltage range, no switching time and high output voltage stability, and is particularly suitable for occasions with high power requirements, but the cost is high. At present, UPS with power greater than 3KVA is almost all online UPS.
The online UPS structure is complex, but the performance is perfect, can solve all power problems, such as the four-way PS series, its remarkable feature is that it can output pure sine wave AC continuously with zero interruption, and can solve all the peaks, surges, frequency drifts, etc. Power problems; due to the need for large investments, they are often used in power-critical environments such as critical equipment and network centers.
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