Home>Knowledge Base>What is a USPS (PC-UPS)?

 1. What is USPS?

- USPS stands for “Uninterruptible Switching Power Supply”.

- It can simply be seen as a combination of an UPS and a PSU (Power Supply Unit), but much more than that. We would rather call it a “Hybrid Power supply” because the smart way it works if you knew that. One of the best part is it has the same size as a standard PSU. Therefore, when installed, it can replace the original PSU in your compatible PC or Server easily. Your PC or Server will work as the same; the only difference now is you do not have to worry about blackouts causing lose of critical data since the unique patented device has both a built-in battery and backup ability, just like a Lap-top.


Figure 1 – USPS block diagram

2. Why use CPS Series USPS?

- A common occurrence of a Desktop PC or a Server that does not have a backup power peripheral is that the system will shut-off and lose critical information due to the power transient condition. Therefore, for critical function use of PCs or Servers, people normally use a UPS for securing its power supply.

A traditional Power Secured (UPS) PC or Server System is diagramed below:


Figure 2 – Typical Power Secured Desktop

Next to the PC is a traditional UPS unit. This unit provides an uninterruptible power supply to the PC. However, the overall space occupied by this traditional configuration is large. In addition, the overall system is larger and heavier to move or re-locate throughout the home or office. Also, another drawback is the “Poor” power efficiency of such a traditional units confirmation due to redundant “Power Converters” in this system.

CPS Series USPS is a new type of Power Supply which embedded UPS function inside and offers users a new choice in market that can provide Battery backup function as well, but with 50% lower cost, 60% lower size and 40% better efficiency and reliability.

3. Heat Output Comparison

- Typical efficiency of UPS is approx 70%, and efficiency of Commodity power supply is about 70% as well. So the gross efficiency of such a power system is:
70% x 70% = 49%
Which means the system lost 51% power during the power conversion.

Figure 3 – Energy Flow and Power Loss

Figure 3 – Energy Flow and Power Loss

4. Heat Output Comparison

-If your system’s power consumption is 100W, and adopts a regular UPS solution, then your power system generates 104W in HEAT.  And you may have to pay another 30 Watts* power cost in air conditioner to exhaust this 104W heat from venue.  Then your gross power consumption is actually 234 Watts.

CPS Series USPS cans provide the same function as UPS solution, but with 80% gross efficiency, in the same condition of 100 watts system consumption, USPS generates only 25W into heat and need 7 watts* power in cooling.  Gross power consumption is only 132 Watts, it’s 43% less!

Energy efficiency in power supplies doesn’t simply mean lower energy bills, it also means increased product reliability.  Small increases in power supply efficiency can result in significant reductions in heat output – as much as 40%.

* Assume the cooling system ERR=3.0

5.Benefits of using USPS?


Less Space Occupation:

Our patented all-in one solution allows you ‘uninterruptible' power in order prevent lost of critical work without the need of another UPS peripheral. On average, the user can save 70% space compared to a traditional system setup.

B. Less Equipment Cost:

USPS can save construction cost 40% less than a stand-alone UPS connected to a PSU, and provide much better performance.

C. Less Power Bill Cost:

USPS exceeds 80% gross efficiency and up to 90% battery efficiency, which means the overall power consumption of the computer system and the cooling system are reduced at least 43% less in gross power costs.

D. Less System Failure Rate:

Heat is one of the leading causes of semiconductor failure, with semiconductor junction failure rates doubling for every 10 degrees Celsius rise in temperature. For this reason, power supplies with excess heat output are less reliable themselves and can 40% lower the reliability of the entire computer. Considering that combined costs associated with IT repairs and lost productivity can exceed $100 per incident, 80% efficiency USPS offers corporations and large procuring organizations a way to prevent unwanted and costly downtime.

E. Environmental protection:

Less power consumption creates less CO2 exhaustion and less natural resource usage. With higher power efficiency, our USPS uses a smaller capacity battery and achieves the same backup time as traditional stand-alone UPS products. Therefore, this reduces the material consumption of batteries.

6. Benefits of Improved Power Quality (PFC)

-PFC stands for Power Factor Correction. But what is Power Factor? It is one of the factors we check the power efficiency of an equipment. Briefly Speaking, PFC circuit can restrain the harmonic current generated by rectifier circuit, and make it become linear as below figures:

   Active PFC PF=0.99                Passive PFC PF=0.75            No PFC PF=0.55

Only Active PFC circuit can effectively improve the PF to 0.99

  • Higher power factor reduces current draw and allows more computers to be operated on the same branch circuit without the need for costly electric infrastructure upgrades.
  • Lower triplen harmonics place less stress on neutrals and increase the life of distribution transformers.

  • In new construction situations, smaller and less expensive distribution systems can be constructed when 80 PLUS computers are considered in the planning process.

Research by the Electrical Power Research Institute (EPRI) suggests that it is most cost-effective to solve the power quality problem at the source with high power factor plug load devices. Power supplies with PFC reduces phase and neutral currents through better power factor and lower total harmonic distortion, in turn lowering the total cost of computer ownership by potentially hundreds of dollars per unit.

7. Comparison Table for UPS+PSU and USPS





Gross Efficiency


> 80%


Battery Efficiency

UPS 70% x PSU 70% = 49% Half of the battery energy is lost in conversion

Up to 90%
Achieves the same backup time as a smaller capacity battery


Total Cost of Power

System Power = 100%
Heat Generation = 100% (Eff=50%)
Cooling System = 100%
Total = 300%

System Power = 100%
Heat Generation = 20% (Eff=80%)
Cooling System = 20%
Total = 140%


Circuit Structure

AC/DC and DC/AC and AC/DC



Transferring Time

4-10ms (Line-interactive UPS)

Zero (Same as on-line ups)


System Reliability

Complex circuits (3 conversions)
Backup power link by Connector
UPS may provide multi-loads

Retrenched circuit (1 conversion)
Battery embedded in PSU
One PC load for one USPS



Complicated, may technician required

Easy & User Friendly


Backup Extendibility

Additional costs for unnecessary parts



Space Occupation

Additional equipment besides PC

None (Inside PC cabinet)


Material Cost

2 independent products
3 conversion circuit
Larger battery

Integrated single design
Retrenched patent circuit
Smaller battery



Lead-acid battery
(pollution & environment unfriendly)

Lead –free battery (CPS USPS)







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