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◎ 1KVA ~ 60KVA 1P3W + G advanced microprocessor control design
◎ design and equipment separate LCD display panel
◎ high input power factor and ultra-wide input voltage and frequency range
◎ output isolation design, to ensure that the system to provide high quality output power load
◎ perfect sine wave double conversion mode (AC - DC - AC)
◎ DC start and auto-detection function
◎ optional large-capacity batteries to ensure the equipment has a longer back-up time, adjustable
    The entire alarm mute function is to provide you with a more comfortable office & living environment
◎ RS232 communication and optional SNMP card can be connected with the communication between the computer equipment
◎ high-efficiency design, effective energy savings
◎ high-efficiency operation in harsh electrical environment
The ◎ advanced protection design system from surges caused by lightning strikes impact

 
Advantages:
    A high reliability: the converter to adopt the bridge structure, can absorb the surge of transformers, inductive load with the back EMF.
    2 full-range use with: can be used for general commercial use: such as banking, computer, communication ....
Military purposes: fire control systems, radar stations, navigation, satellite.
        Industrial use: motor, compressor, mercury vapor lamps, automatic control of machinery and equipment, exposure machine, etching machine.
    3 can be applied to the semi-waveform load, or three-phase unbalanced electrical environment.

Disadvantages:
     A high cost: the bridge links the use of 2 times the amount of power crystals, and isolation transformer absorb back EMF, the UPS and the load end isolation.
     UPS load end 2 transformer isolation, and therefore can withstand abnormal voltage feedback UPS capacity of the machine, so the volume is high frequency UPS large due to the capacity of the transformer equivalent.
 
How it works:
Low frequency UPS mains harmonics to improve with power after the upgrade, after the bridge rectifier (boost) DC capacitor C1, C2 charging capacitor stable DC voltage of 310 volts supply four power transistors combination bridge rectifier; made to produce the AC sine wave.
AC sine wave is half weeks by the S1 and S4 power crystal Forward PWM modulation.
Negative half cycle of AC sine wave power crystal by S3 and S2 do and negative PWM modulation.
Surge and counter-electromotive force by the S2 and S4 to 320 times per second to absorb the counter electromotive force.
So that L to zero due to Ldi / dt = dv / dt, S2 and S4, and thus dv / dt will be zero, so the UPS itself leakage or the counter electromotive force of the external transformer inductive load thus disappeared, especially when the load early inputs the current surge waves caused by the first half of the week, by S2, S4 doing hysteresis curve to zero in order to protect the load end and extend the service life.
 
Conclusion: The high reliability and protect the load equipment
     A rectifier DC voltage is approximately 310V, non-800V, the capacitor and the power transistor is exposed to lower operating voltage, and therefore the higher the reliability of the low frequency of the UPS.
     2 power transistors for four full-bridge connection, connection of non-two half-bridge, full bridge back-EMF absorption, half-bridge, you can not absorb the surge with back-EMF. When the counter electromotive force to charge the capacitor, if it exceeds the value of the upper limit thereof endure, capacitor or a power transistor may be damaged.
     3 assuming full-bridge power crystal fault, the fault current will not flow to the load side, half-bridge power transistors flowing into the stay to the load end device, the load end device caused damage, industrial instruments and production equipment use low frequency UPS, the market share of 95% or more, in fact, for security and reliability considerations.