Three functions of UPS power supply

The function of UPS power supply is to ensure the continuous operation of electrical equipment in case of grid voltage drop or interruption. At present, UPS, as a backup power supply, has been widely used in hospitals, banks, data management and other fields, and plays an irreplaceable role in power grid voltage interruption.

The function of UPS power supply is to ensure the continuous operation of electrical equipment in case of grid voltage drop or interruption. At present, UPS, as a backup power supply, has been widely used in hospitals, banks, data management and other fields, and plays an irreplaceable role in power grid voltage interruption. Here is an introduction:

Three functions of UPS power supply

1. Stabilized voltage

UPS has a good voltage stabilizing function. The high-grade UPS power supply will supply the load after the mains voltage is stabilized, which is equivalent to an AC mains voltage regulator. When the power supply is interrupted, ups will immediately convert the power of the battery in the machine into a stable 220 V through the inverter to continue to supply power to the load. Therefore, it has voltage stabilizing function.

The low-grade UPS power supply only connects the mains power to the load, and has no AC voltage stabilizing function. When the power supply is interrupted, ups will immediately convert the power of the battery in the machine into a stable 220 V through the inverter to continue to supply power to the load. Therefore, there is no AC voltage stabilizing function for city power supply, but for inverter AC, it has voltage stabilizing function.

UPS power supply is divided into online UPS power supply and backup UPS power supply. Generally, what the home computer is equipped with is backup UPS power supply, which belongs to one of the backup power supply; the backup power supply is with voltage stabilizing part, which adopts the relay shifting and voltage stabilizing method, with poor voltage stabilizing effect, so it can not be considered as a voltage stabilizer.

2. Filtering

In order to improve the utilization of off-line ups and the power quality of the power grid where it is located, the UPS power supply with active filtering function is studied. Its essence is an improvement of off-line UPS, which can realize uninterrupted power supply and active filter function at the same time without increasing hardware cost. The system can work in APF mode and UPS mode respectively according to the power grid condition.

The special filter of UPS power supply solves the harmonic problem of UPS power supply. The harmonic generated by UPS power supply is filtered, and the distortion rate of harmonic current is reduced to 5% ~ 10%. The special filter of UPS power supply improves the system reliability, effectively reduces the load rate under heavy load, reduces the apparent current, suppresses the harmonic distortion, reduces the transient over-voltage, reduces the change rate of voltage and current, and ensures the power reliability.

The special filter for UPS power supply can not only improve the power factor and reduce the apparent current, but also reduce the distortion of high-order harmonic and the loss of high-order harmonic.

3. Uninterruptible power supply

UPS can provide electric energy for a period of time after power failure. The power source of online UPS can not be separated from the support of battery. If there is no battery in the online UPS, UPS is equivalent to a regulated power supply. Because of the battery, when the power supply is abnormal or power failure, the battery will provide the chemical energy through the inverter The alternating current can be sent out to provide power for the load, so that the electrical equipment can continue to operate normally without the influence of power failure.

Generally speaking, UPS is set to solve the problem of uninterruptible power supply. The three basic functions of ups are voltage stabilization, filtering and uninterruptible.

It is the function of voltage regulator and filter to eliminate or weaken the interference of power supply and ensure the normal operation of equipment; When the power supply is interrupted, it can convert the DC power supplied by its DC power supply part into the perfect AC power supply for the load, in which the power supply from the city power supply to the battery is generally switched for 0 time, so that the load equipment can maintain the operation without any change, and truly ensure the uninterrupted operation of the equipment.