Uninterruptible power supply
- INTRODUCTION OF UPS?
UPS is the abbreviation for Uninterruptible Power Supply and is a device that supplies power to devices for a fixed amount of time without stopping even when there are problems occurring with utility power and other power sources. In this present-day highly information-orientated society, the work tasks of many industries, including manufacturing, service, and medical, operate on networks. For this reason, network system stoppages have an enormous impact on society and as such, the importance of UPS to provide these systems with a stable power supply is increasing.
- What is mean by UPS system?
UPS stands for Uninterruptible power supply(UPS). In the day-to-day life as well as industry During power cutdown or failures we require power for that purpose, Uninterruptible power supply provides battery backup to a computer when the flow of electricity drops to a discontinuous voltage, or if it stops. It helps to achieve computer systems and IT equipment safe and operational. It is used to protect hardware like data centers, computers, telecommunication equipment, etc.
- Requirement of UPS:
There is a huge application where even a temporary power cut or failure can cause large economic losses also face some problems to the public. Ex: of such applications are major computer installations, hospital intensive care units (ICUs), process control in chemical plants, data centers, safety monitors, Telecommunication systems, etc.
- Types of UPS System :
Generally, There are three types of UPS systems.
- Offline/standby UPS.
- Online/Double conversion UPS.
- Line-interactive UPS.
1. Offline/Standby UPS system:
The Offline UPS is also called a Standby UPS system which can give only the most basic features. In (Fig.1) shows the primary source is the filtered AC mains When the power breakage occurs, the transfer switch will select the backup source Thus we can clearly see that the offline system will start working only when there is any failure in mains. In an offline UPS system, the AC voltage is rectified first and stored in the storage battery connected to the rectifier. When a power break occurs, this DC voltage is converted to AC voltage because of a power inverter and is transferred to the load connected to it.
This is the least expensive UPS system and important in the industry as well as day-to-day life and it provides surge protection in addition to a backup.
2. Online/Double conversion UPS:
The online UPS system is also called a Double conversion UPS system. Firstly the AC main supply input is converted to DC by using a rectifier, After that rectified DC output is stored into the battery. DC supply in the battery is converted into AC by the process of inversion using an inverter and given to the load or equipment which is connected via the inverter so that no power transfer switches are necessary. The online UPS system is more costly due to the design of the system. This system constantly runs converters as well as cooling systems.
The rectifier which is powered with the normal AC current is directly driving the inverter. Hence it is also called Double conversion UPS. It provides complete isolation of incoming power and sensitive loads.
3. Line Interactive UPS:
Line-interactive UPS is commonly used for small industries, departmental servers, and webs. The designing of line-interactive UPS is alike to a standby UPS, in addition, the design of Line Interactive generally includes an automatic voltage regulator (AVR) or a tap-changing transformer. Line-interactive UPS systems design same as offline topology enhanced by the addition of voltage regulation features to the raw mains supply.
- Advantages of UPS System:
- Installation
- Reliability
- Consistency
- Protection
- Filtering
- UPS Application:
Application of a UPS include:
· 1)Health care unit
· 2)Data Center.
· 3) Telecommunication.
· 4) Security system.
· 5) Network Equipment and computer system.
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