Famous UPS power supply manufacturers prioritize high frequency as their absolute main target in technology selection and future development trends. UPS with 30kVA and below mainly use high frequency machines, which are closely related to their fast dynamic response speed, high power density, small size, low noise, and low price (especially for small machines). The uniqueness of high frequency machines is that they can achieve input active power factor correction, truly representing the development trend of green power in the future What are the advantages and disadvantages of high-frequency machines compared to power frequency machines?
APC UPS power frequency machine: Designed based on traditional circuit simulation principles, the mechanical components (such as transformers, inductors, capacitors, etc.) are relatively large, and there is usually less noise during high load operation. However, this model has strong resistance performance in harsh power grid environments, and is more reliable and stable than high-frequency machines
APC UPS power high-frequency machine: divided into smart upsSUA and smart upsRT series; Using high-frequency switching technology, the inverter frequency of high-frequency machines is usually above 20kHz However, high-frequency machines have poor tolerance in poor power grids and environments, and are more practical for use in environments with stable power grids, less dust, and suitable temperature/humidity The development goals of UPS are high-frequency, miniaturization, intelligence, and greening Because miniaturization can save investment, increase efficiency, and save space
Compared with APC power frequency machines, APC power high-frequency machines have the advantages of small size, light weight, high operating efficiency (low operating cost), low noise, suitable for office spaces, high cost-effectiveness (low price under the same power), and minimal impact on space and environment. In contrast, high-frequency UPS is more susceptible to SPIKE and TRANSIENT caused by copiers, laser printers, and electric motors. Due to the transformer of the power frequency machine blocking the mains power from the load, it provides safer and more reliable protection than high-frequency machines in environments with poor mains power. In some situations such as medical, UPS is required to have barrier devices. Therefore, for industrial, medical, transportation and other uses, power frequency machines are better. The selection The selection of the two should be evaluated based on factors such as user differences, installation environment, and load conditions.