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Frequency machine (frequency UPS power supply) was born in 1970, belongs to the time of the cutting-edge technology, with the development and progress of the times, which covers an area of ??large, heavy weight, high power consumption and many other features gradually being revealed, so at 80 time, high-frequency power supply UPS technology was born, although the high-frequency power supply temporarily unable to completely replace the UPS frequency UPS power supply, but with the development of technology, high-frequency machine will be the ultimate direction of development. And frequency machine compared with the advantages of high frequency UPS power supply as follows: (1) input power factor frequency machine Engineering 200kVA UPS generally less input circuit using thyristor 6-pulse rectifier, input power factor does not exceed 0.8, Harmonic current 30% of the large. If the pre-generators, generator capacity of at least 3 times the UPS power; if it is low-power single-phase UPS, generator capacity is at least five times the UPS power supply. And any capacity, high-frequency machine UPS input power factor of 0.99 or more can be done, the harmonic current is less than 5%, the same pre-theoretical capacity of the generator and UPS power, which would greatly reduce the investment and the area and so on. Especially to take advantage of mains with good economic and social significance. (2) itself under the same power consumption indicators, when asked to enter the power factor is 0.95, frequency machine UPS or harmonic filters must be applied to 12-pulse rectifier, that is in front of a device to increase, along with the output transformer, the UPS more than two areas of high-frequency machine. Both due to the impact of this, so the efficiency of frequency machine UPS UPS 5% lower than the high-frequency machine. 100kW of capacity at the same frequency machine high frequency machine UPS UPS annually consume more than 50,000 kWh! This energy saving in today's society, 5% means a huge loss of energy. (3) Foreign interference is less interference there are two, one is audible mechanical noise, one is inaudible electrical noise, both noise frequency machine UPS has formed on the device and injury to persons . Electrical noise affect the stability of the machine, mechanical noise affect people's health, and reduced efficiency. The high-frequency machine UPS as a result of above 20kHz, 20kHz is the frequency of the human ear can not hear, quiet working environment. Also, because the high-frequency machine UPS input power factor of 0.99 or more, almost linear, so the external interference is almost zero. (4) small size, light weight due to frequency machine UPS output transformer and adaptation 50Hz low-inductance capacitors and other devices so that volume and weight are great. For example, a certain brand of 200kVA UPS power supply frequency machine weight 1380kg, while the same is this one of 250kVA UPS frequency machine weighs only 830kg. (5) all-digital technology start-frequency machine UPS is an analog technology, and now the general development of the combination of digital and analog technology. Reliability than analog technology, digital technology is low. The high-frequency machine UPS technology is an all-digital technology, it is understood, the reliability is high. (6) ability to adapt to a strong grid frequency machine UPS to adapt to the input voltage of ± 15% change has been very difficult; and high-frequency machine UPS even adapt the input voltage ± 30% variation, which in turn greatly extends battery life . While current technology is not yet capable of high-frequency machine to do a lot of power, but with the development of new materials and technology, I believe the future will eventually replace the high-frequency power supply UPS UPS power supply frequency. Source: www.rendapower.cn