UPS is with voltage regulation function, especially on-line, the output is very stable. The online UPS has a voltage stabilizing function because the online type rectifies the input AC power first and turns it into DC. Part of the capacity is used to charge the battery, and the rest is converted to AC power through the inverter again because this voltage is set by the UPS itself In this way, no matter how the input mains power fluctuates, the output voltage is always within the set range, and it can filter the multiple harmonics in the mains.
When the mains power is supplied, the online UPS is the function of the voltage stabilizer and the filter to eliminate or weaken the mains power and ensure the normal operation of the equipment; when the mains power is interrupted, it can be provided by its DC power supply part. DC power is converted into perfect AC power for the load. The switch from mains power to battery power is generally a 0-time switch so that the load equipment can keep running without feeling any change, which truly guarantees the uninterrupted operation of the equipment.
Generally, the online UPS power supply is designed according to the inductive load, so it is its duty to carry the inductive load(difference between line interactive and online ups). Generally, the capacitor connected in parallel at the output of the online UPS inverter plays a filtering role on the one hand, and on the other hand, it offsets the inductance component in the load.
If the load is capacitive, how can a capacitor be used to offset the capacitive component? Only the capacitance component of the output can be increased, and the current of these capacitance components must be provided by the inverter, so that the active component of the inverter output is reduced, so the carrying capacity is weakened.
One of the major advantages of online UPS is that the power supply lasts for a long time, which is usually several hours, sometimes as large as ten hours. Its main function is to allow you to work as usual in the event of a power failure. Obviously, Because of its special function, the price is obviously a lot more expensive. This online up is more suitable for industries such as computers, transportation, banking, securities, communications, medical care, and industrial control.