Advantages:

The most beneficial advantage of an online UPS is, its ability to provide an electrical firewall between the incoming utility power and sensitive electronic equipment in comparison with the other types of UPS.

1. It is basically providing isolation between main supply and load.

2. Inverter is always switch on therefore; the quality of load voltage is free from distortion.

3. All the disturbances of supply i.e. blackout, brownouts, spikes etc. won't be there in the output.

4. Voltage regulation will be better.

5. Since inverter is always on therefore, transfer time is practically zero.

Working Principle:

It uses a ‘double-conversion’ method of receiving AC input, rectifying to DC for passing through the rechargeable battery (or battery strings), then inverting back to 120 V/ 230V AC for empowering the protected appliances.

UPS supply power during such events as a blackout, voltage surge, voltage sag, or over-voltage. A double-conversion online (UPS) supplies consistent, clean, and near-ideal power regardless of incoming energy. This UPS converts incoming AC power to DC and then back to AC.

Difference between Online UPS and Offline UPS:

Online UPS	Offline UPS
● It is an Uninterruptible Power Sources that supplies power from the AC mains to the load via the inverter and rectifier combination.	● This UPS supply AC mains power directly to the load.
● In an online UPS, there is a continuous flow of current from the battery.	● Offline UPS only draws current from the battery during the primary power failure or power blockade.
● Online UPS needs a massive battery charger circuit as it carries the entire load current throughout.	● This UPS requires a small charger circuit as it only charges the battery.
● The load and the input supply are comprehensively isolated in this type UPS.	● There is no isolation amidst the load and the input supply.
● This type of UPS has excellent performance output because it safeguards the output load from input voltage alteration and spike.	● Offline UPSs performance diminishes with the input voltage alteration that is directly connected to the load.
● It spontaneously switches across the source, resulting in no time delay.	● This type of UPS uses a static transfer switch to switch amidst its source with a time delay of 5ms.
● We can say it remains ON all the time.	● It is not always on but switches on only at the time of power failure.
● Owing to its ON condition always, it may be inefficient and unreliable.	● It is reliable and productive as it is mostly off when unused.
● Due to the high operating temperature, This UPS require massive heat sinks.	● Compared with online UPS, the offline UPS requires a smaller heat sink because of low operating temperature as it is in an off state most of the time.
● The component used in its operating system must have the capacity to withstand high temperatures.	● The requirement of a high-temperature tolerance component is not necessary.
● It is expensive.	● It is cheaper.
● It is used for very delicate electronics that cannot withstand any gap amidst supplies such as in-hospital ICUs.	● This sort of UPS is used for electronic equipment that can tolerate a delay of 5ms, such as computers and other devices.

Why Choose NEXUS UPS?

✔ Promoters with over 30 years of experience in the manufacturing of power conditioning products

✔ A highly qualified and experienced team of QC and Production

✔ State of the art in house R&D Setup

✔ Focus on high product reliability and quality assurance

✔ Prompt and highly efficient service support

✔ High quality components used in manufacturing

✔ Nexus Power Systems is an ISO 9001 Certified organization

✔ Nexus Power Systems has also obtained ISO 14001:2004

Online UPS Systems

This note will post an explanation about the Online UPS Systems. The Uninterruptible Power Supply Systems are commonly categorized as:

1) Static UPS Systems

2) Rotary (or dynamic) UPS Systems

3) Hybrid UPS Systems

The Static UPS Systems can be categorized into three prime categories:

a) Online UPS

b) Offline UPS

c) Line Interactive UPS

Components:

A) Battery Charger and Rectifier

B) Inverter

C) Static Transfer Switch

D) Logic & Control System

E) Battery Bank

F) Diagnostics & Communication blocks

● Medium and Large capacity: It requires outstanding amount of power semiconductors such as GTOs, MCT, MOSFETs, Darlington pairs are used.

● Large and medium capacity: It handles extensive voltage and current, they are fixed on particularly designed heatsinks. This UPS play as control elements in the rectifier blocks and inverter.

Online UPS System Operation:

1. During normal or even abnormal conditions, the inverter delivers energy from the prime through the rectifier, that charges the batteries continuously. Furthermore, it can also provide power factor modification.

2. In this way, when the power supply fails, the inverter still supplies energy to the loads from the batteries.

3. Importantly, no transfer time exists during the change from normal to stored energy modes.

4. Generally, it is a most dependable UPS configuration due to its easiness, and the nonstop charge of the batteries, this means that they are always ready for the next power outage.

5. It provides total independence amidst input and output voltage amplitude and frequency. So high output voltage quality can be obtained.

6. When an overload occurs, the bypass switch connects the load directly to the primary utility, to guarantee the unceasing supply of the load, thereby avoiding the damage to the UPS Module.

7. In this situation, the output voltage must be co-ordinated with the utility phase, otherwise the bypass operation will not be acceptable.

8. Typical competence of the online UPS systems is up to 94%, that is limited due to the double conversion effect.

9. This system is characteristically with sensitive equipment or settings.

10. Commonly all the commercial UPS units of KVA and above are Online UPS Systems.

Excellence From The Assembly Line

nexus ups systems are built to the most exacting quality standards. using High quality components Such as: IGBTs from Eupuc, Germany; MOSFETS from International Rectifiers; Thyristor modules from Infineon & Semikron; Capacitors from Alcon, Epcos & Keltron; Transformers from Bhurji/Trusine and SMF Batteries from Exide/Quanta.