Types of UPS
Online UPS double conversion
When purchasing UPSs, many people still have doubts about which is the best product for their application, because they do not know the main topologies?
The most commercial topologies of the no-breaks are Standby UPS, interactive UPS, and online uninterruptible power supply double conversion. Next, see the main characteristics of these topologies:
These no-breaks are characterized by presenting in network mode the voltage and frequency at the output equal to that of the electrical network, that is, the power is transferred directly from the network to the output. In the absence of an electrical network or a variation in voltage or frequency outside of the specified safe levels, the inverter enters into operation by feeding the equipment connected to the output through the internal batteries.
The interactive UPS
They are also characterized by presenting the frequency in the network mode equal to the output of the electrical network, but they have an internal stabilizer, where the output voltage is corrected to a safe value if the input voltage varies for values that could harm the connected equipment. In other words, between the input and output of the product, there is a stabilizer based on a transformer responsible for the correction of the output voltage. In the absence of the electrical network, voltage or frequency outside of the specified safe levels, the inverter enters into operation by feeding the equipment.
Online UPS double conversion
They provide the highest level of protection by isolating the equipment from the electrical network through power converters. The term double conversion means that the product performs in network mode the conversion of the alternating current of the electrical network to direct current (through the rectifier PFC) and then from direct current to alternating current (through the inverter). Thus, the voltage and frequency of output are not totally dependent on the input and since the inverter is feeding the load at all times, the transfer time is null in the occurrence of a blackout. In the absence of the power grid, the energy is then transferred from the batteries to power the loads.
No breaks can be designed to operate in battery mode with two types of output voltage waves: the pure sine waveform (equal to the voltage form of the mains voltage) and the sine waveform per approximation (rectangular) PWM).
The no-breaks with sine waveform by approach have lower cost and are recommended for low power applications such as routers, televisions, computers, consoles, equipment for points of sale and other electronics for housing and small offices.
Difference between a UPS or No Break, a voltage regulator and a backup battery:
Although different systems are sometimes confused or believe that they perform the same processes, to make clear the difference is better to explain what is the general function of each.
A UPS, No Break or uninterruptible power supply system is a system that is placed between the main power supply and electrical / electronic equipment in order to supply power (alternating current) and allow the correct operation by a some backup time to the connected equipment in case of a total power cut in the main supply.
It is a system that also connects between the main power supply and electrical/electronic equipment in order to maintain a constant level of an output voltage in all its intakes despite the voltage variations that arise in the main supply or in its input voltage.
If the power supply to the main outlet is interrupted completely, the voltage regulator stops functioning as well as the equipment that is connected to it. Some UPS systems usually bring it integrated internally to keep the output voltage constant in the outlets, which often causes a UPS system to be confused with a voltage regulator.
It is a battery (preferably charged) that is integrated into a system, which begins to supply power to the connected components when the main power supply fails.
Some specific functions that it has are:
Internally supply the direct current voltage UPS system which will be converted by the inverter circuits into the alternating current voltage to continue feeding the connected equipment.
Provide power to a system or components that operate with direct current voltage by connecting the battery in parallel with the power supply. When the power supply is damaged, the backup battery will power the system components for a set time.