Modular UPS power shortcomings

Popularization of the application of the need to break through the price barrier

Rack modular UPS constraints on the development of the difficulties are mainly concentrated in the improvement of power density and increase the number of parallel and reduce the price of three aspects.

Rack modular UPS from the traditional vertical (tower) structure of the transition, relative to the traditional vertical (tower) structure has a wide cooling channel, large size and high power cooling fan huge volume, modular UPS to facilitate the operation of a single replacement, the module's volume and weight are smaller.

By the limitations of the volume, in the case of UPS module power increase, heat dissipation has become a big problem. In order to be able to achieve the purpose of safe work, modular UPS not only use the original passive cooling, active cooling, axial cooling and ducted cooling technology, but also the introduction of heat pipe cooling.

In order to ensure the highest availability and scalability of power supply, modules should be used in parallel without limiting the number.

When multiple UPSs are connected in parallel, one of the most important indicators is the current equalization, that is to say, if N UPSs are connected in parallel, it must be ensured that the output current of each UPS is 1/N of the total output current, or at least the maximum imbalance between them should be within the required range (generally less than 2%).

In practice, the output impedance of all UPS can not be the same, coupled with the output voltage of the inverter and the utility voltage phase locking have positive and negative errors, the voltage of each UPS both phase and amplitude differences, these are limited to the increase in the number of parallel units, which limits the power of the machine to improve.

At the same power level, modular UPSs are much more expensive than traditional UPSs.

Future, with the continuous development of power electronics technology, the demand for UPS systems continue to increase. Like trade exchanges gave birth to container technology, container technology has triggered a revolutionary change in the global transportation industry, rack-modular UPS will certainly cause a new revolution in the uninterruptible power supply, which in turn will become the trend of the future development of UPS systems.

Modular UPS including rectifiers, inverters, some also include static bypass switches and ancillary control circuits, CPU motherboards and so on.