... .It make sure load can working well even if the electric supply power cut. Step 1 ,Under net work electricity: It ... , After net work electricty power cut, it will transform contravariant electric supply within 5ms to make sure it work well. Step ... kinds of peerceptual type equipments, such as motors, air-conditions, electric drills,daylight lamps,etc. 7) Power Frequency Design, stable performance, low ...