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How Is an UPS (Uninterruptible Power Supply) Defined?

How Is an Ups (Uninterruptible Power Supply) Defined?

A UPS (uninterruptible power supply) defined as a piece of equipment or device capable of supplying power. And energy in the event of an interruption of what would be its normal supply. In addition, you can add other functions that end up improving the supply of electrical energy to sophisticated or high-risk electrical equipment that connects to it.

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Among the things it adds may be as follows:

  • An incoming power stabilizer,
  • Power source isolation from normal power,
  • Incoming power filtering,
  • Waveform correction,
  • Line frequency correction,
  • Protection to peripherals from CPU or even its parts,
  • Such as network cards or modem’s,
  • Line power monitoring,
  • To optimize protection, etc.

Creation Of Electronic Equipment

The creation of electronic equipment highly sensitive to voltage fluctuations, the liberation of market agents and the increased expectations of customers make CPE an imperative need. This issue has taken considerable importance in recent years due to the increase in interruptions of production processes in industries.

Equipment And Controls

Since they use equipment and controls that are extremely sensitive to voltage variations, generating economic impacts on consumers and service companies. Power quality problems include a wide variety of electromagnetic disturbances, which can originate inside or outside the facilities of customers or service companies, and can cause many types of undesirable effects on loads.

UPSs Correct Network

UPSs correct network errors, which are part of the power quality study, however, it is convenient to know how the electrical energy behaves once it corrects by the UPS when it delivered to a load, to have greater reliability of the performance of both the UPS and the device that connected to it; In this article we see how the design of a UPS implemented to which a liquid crystal display added that visually shows some power quality parameters.


A UPS is an electrical supply source that has a battery to continue powering a device in the event of a power outage. UPSs called in SAI (Uninterruptible Power Supply). UPSs often connects to computer power, allowing them to use for several minutes in the event of a power outage. Some UPSs also offer applications that are responsible for carrying out certain procedures automatically in cases where the user is not there and the power supply cuts off.

UPS Types

SPS (stand by power systems) or off-line: an SPS is responsible for monitoring the power input. Switching to the battery as soon as it detects problems in the power supply. That small change of energy origin can take a few milliseconds.

On-line UPS: Avoid those milliseconds without power when a power outage occurs, as it provides constant power from its battery and not directly. The online UPS has a variant called by-pass.

Typical UPS Components

Rectifier: rectifies the input alternating current, providing direct current to charge the battery. The inverter fed from the battery and converts the current back to alternating current. When the battery discharged, it recharges in a period of 8 to 10 hours, for this reason the capacity of the charger must be proportional to the size of the battery needed.

  1. Battery:

Is responsible for supplying energy in case of interruption of the electrical current. Its capacity, which measures in ampere hours, depends on its autonomy (amount of time it can provide energy without power).

  1. Inverter:

Transforms direct current into alternating current, which powers the devices connected to the UPS output. Two-position switch (By-Pass), which allows the output to connected to the UPS input (By Pass) or to the inverter output.

Reliability And Effectiveness

Currently, uninterruptible power supplies or UPS, provide great reliability and effectiveness to the operation of critical loads whose work requires constant operation without stopping processes, but in some cases, it is convenient and interesting to know the behavior of the load as soon as to electrical conditions, so that for a conventional UPS, the inclusion of a network analyzer would be quite expensive and complex.

UPSs Make Available Critical Loads

Most of the time, UPSs feed specific loads, also known as critical loads such as some medical devices, industrial elements where continuous operation of a process required, computer elements and communications elements; where we can deduce that these elements need constant power and that the energy they receive is of good quality.

Of course, these devices designed to operate in the event of short-term emergent faults, that is, between 5 and 25 minutes, although according to design characteristics, some UPSs found, have a duration of autonomous operation of up to several hours, but that aspect is determined by the capacity of the batteries.

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