Posted by admin | Posted in Electronics | Posted on 06-08-2010
Tags: design, diy, Electronics, power, smps, switching power, switching power supply, switching power supply design, switching power supply noise, switching power supply tutorial
Power Protection Systems: Providing Protection to Electronic Devices
Power protection systems are highly useful in computer server environments and in industries. The major advantage of the power protection system is that it is continuously used and recharged during normal usage. Power protection systems are developed to cover various types and levels of protection for electrical equipment. Earlier these systems were quite expensive but the latest developments in the field of power equipment have reduced their cost so that it is within the reach of everyone.
Some of the most commonly used power protection systems are:
• Surge Suppressors– Surge suppressors are the simplest form of power protection appliance designed to protect electrical devices from voltage spikes. It detects and diverts any power over voltages after a set limit away from the computer. Surge power protection system protect the electronic devices in three ways, by diverting surges from live to neutral, by diverting surges live to earth and by diverting surges from neutral to earth. These systems are designed only to protect against surges and do not protect against lightning strikes.
• Phoneline Surge Protectors- Phoneline surge power protection systems are stand alone suppressors that fits to the telephone line. It functions in similar way as surge suppressor but can only handle voltages generally found on a telephone line. It uses GaAs arrestors, which operate in a similar way as a fluorescent tube. GaAS arrestors are slow and produce short-circuit on phone line while protecting against a surge. This further makes phone line dead for a short while.
• Line Conditioners– Line conditioners power protection system works by smoothing the flow of power to computers and also filters out electromagnetic pulses. While doing so it first filters over and under voltages so that steady flow of electricity is supplied to the computers and it also eliminates interference caused from nearby electrical equipment like washing machine, CRT monitors, motors etc.
• Standby UPS– Standby UPS is a switched power supply, run by a device containing batteries that provides power for few minutes so that computer system is properly shut down. Any UPS that has a switching time is a standby UPS. Switching times are generally less than 20 milli seconds and are set by the manufacturers.
• Online UPS– Online UPS provide power to computers from its batteries for a limited time when the main supply is interrupted. An online UPS constantly supply power to computers through its batteries and it does by breaking the circuit between the power supply and computers.
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