Static transistor UPS incorporating battery backup
Eddie Barnett · Institution of Engineering and Technology eBooks · 1992
The ever increasing use of computer systems, especially in the medium power range (10 MIPS, 5 Gbytes), results in an ever increasing requirement of associated UPS systems generally with ratings of up to 100 kVA. In many of these applications the reliance placed on the system dictates that a secure clean continuous power supply is available. They are often installed in existing buildings in which there is no dedicated plant room. The alternative is to locate these systems within the computer room. Obviously the traditional large system, producing in excess of 70 dBA noise level with high heat losses, is not suitable for operation in this type of environment. There are many aspects of the design of these systems which differ from the plant room systems. Obviously the first criterion with any system must be reliability, the noise emitted must be less than the noise level in the computer room, and the heat losses reduced by designing a high efficiency system. With the module located in the vicinity of the computer equipment much more consideration must be given to radio frequency interference (RFI) either conducted or radiated, both of which can result in data corruption.