Generally, UPS has a large footprint and requires an extra installation space outside computer. In contrast, Nipron nonstop power supply combines the built-in type power supply with the uninterruptible power supply capability. The nonstop power supply provides better solution to the power supply security problems by a compact unit which can be installed in a computer. Furthermore, with the unique 2-gate 2-engine architecture, the Nipron nonstop power supply can be operated from both AC and DC inputs simultaneously, ensuring better DC output voltage stability against primary AC input voltage anomaly.

AC source power is converted into UPS output power and then converted into the DC output of the power supply inside computer. The double power conversion produces a large power loss, resulting in a low power efficiency in typical of 50% to 60% range.

External UPS and the built-in power supply of computer are connected in series. If either of them fails, the system totally fails at all. The incidence of power failure becomes sum of the failure rates of UPS and built-in power supply.

Since the Nonstop power supply performs the power conversion only once, an excellent power efficiency as high as 70% is achieved. 

Additionally, the nonstop power supply has obvious advantage in reliability. Compared to the UPS, the nonstop power supply has 2 engines (AC input and DC input engines),  which are operated in parallel. If either engine fails, the other engine keeps working to sustain the output. The dual engine architecture ensures the high reliability of power supply required for computer systems, telecommunication and FA applications.