Low frequency UPS is power, large volume, heavy weight
There are three factors leading to the efficiency of low frequency UPS lower than high frequency UPS . Firstly, the low frequency UPS rectifier for buck topology, the device operating current is large, whether the internal line of linear loss or square loss are higher than the online high frequency UPS ; Secondly, due to the reasons for the need to boost the output, the low frequency UPS use the built-in multi output transformer, while the high frequency UPS not, resulting in the efficiency of low frequency UPS decreased by 2%-3%; Thirdly, in the practical application, in order to improve the input power factor to more than 0.95, and decrease the injection of harmonic pollution, the external low frequency UPS a 5 or 11 harmonic filter, the efficiency will drop again 2%-3%. According to a British operator and a Spanish operator network operation statistics, the efficiency of low frequency UPS in general about 85%, while the high efficiency UPS of 92% and modular ...