UPS is the abbreviate of Uninterruptible Power Supply, it is the UPS UPS that we often say. The common UPS power source on the market basically has online (OnLine) and mothball type (OffLine) two kinds.
System of EPS lash-up power source is the abbreviate of Emergency Power Supply, it is the lash-up power source of the special requirement of industry of contented fire control.
One, mothball type UPS is direct when town report is regular by town report to laden power supply, when town report exceeds its work limits or power cut, turn through transfer switch for batteries inversion power supply. Its characteristic is: The structure is simple, volume is minor, cost is low, but input voltage range is narrow, output voltage lasting accuracy is poor, have switch time, and output is undee and average for square wave
2, UPS of online and interactive type is direct when town report is regular by town report to laden power supply, when town report on the low side or on the high side, pass the output after stabilized voltage of circuitry of UPS in-house stabilized voltage, when town report unusual or when power cut, turn through transfer switch for batteries inversion power supply. Its characteristic is: Have wider input voltage range, noise is low, volume is minor wait for a characteristic, but time of same existence switch.
3, online UPS is when town report is regular, undertake by town report rectification offers volts d.c. to give inverter the job, offer alternating current to load by inverter, when town report is unusual, inverter provides energy by batteries, inverter is in working status from beginning to end, make sure very close to each other stops output. Its characteristic is, have extremely wide input voltage range, do not have switch time basically and output voltage lasting accuracy is tall, suit taller to power source requirement situation particularly, but cost is higher. Current, the UPS that power is more than 3KVA is online UPS almost.
UPS has the function such as wave of stabilized voltage, filter at the same time, some UPS can change when breakdown or overload by power supply of town report bypass.
The voltage output of mothball type has bigger wave motion, between 170V-260V, use high speed relay to realize the changeover between town report and accumulator, changeover time is less than 10 millisecond. Online uses inversion circuit job from beginning to end, the stability of its voltage is tall, basically be inside 5% limits of 220V ± , time of basic to accumulator nonexistent changeover; With town report bypass changeover uses static switch, changeover time can reach small second level.
UPS outputs precision time of tall, changeover is fast, cost is higher at the same time (be EPS about double) , at ordinary times specific power consumption is big (online) , lead plane life is briefer (8-10 year) .
EPS is similar to the UPS of mothball type a bit, at ordinary times inverter does not work, the ability when town report cuts off the power throws storage battery. General and incorrect power source undertakes constant current, constant voltage is handled. Use contactor changeover normally, switch time all is 0.1 ～ 0.25S. Its advantage is a structure simpler, cost is inferior, at ordinary times specific power consumption is small without noise, lead plane life is long (15-20 year) , can suit to reach omnibus load at inductance sex, capacitance sex, frequency conversion can come true when need soft start.
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