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Power of portable UPS power supply
- Apr 19, 2018 -

Portable UPS power supply as an energy storage device for an uninterruptible power supply system plays an extremely important role in ups. When utility power is interrupted, the portable UPS power supply will continue to supply power to the load by virtue of the energy stored in the battery. During the charging process of the battery, whether the DC power provided by the portable UPS power supply for the battery can meet the requirements of the battery charging is very busy, and the service life of the battery is determined to a large extent, so my sales department is in the selection process of the portable UPS power supply. , Ups the rectifier / charger's technical parameters as the most important selection. Due to the nature of its work, the securities sales department requires that the portable UPS power supply must be equipped with a large-capacity battery pack to ensure normal power supply when the mains power is interrupted for a long time.

Power of portable UPS power supply

The output power of the portable UPS power supply is closely related to the power factor. Under the capacitive load condition, the output power of the portable UPS power supply can reach the nominal power, and under the inductive load condition, the output power of the portable UPS power supply is greatly reduced. Even when the power factor is 0.8 (inductive), its output power can only reach 50% of the nominal power. The load of the portable UPS power supply is generally a computer load, and the internal power supply of the computer load is mostly a switching power supply. Under the switching power supply load conditions, the instantaneous power is high, but the average actual power is very small. Therefore, when a portable UPS power supply is used as a load, the power factor of the portable UPS can only reach about 0.65, and the load power factor index of the portable UPS power supply is generally 0.8. According to this indicator, the switch power supply load is driven, and the portable UPS power supply is damaged. Possible. Therefore, when selecting the power of a portable UPS power supply, it is important to consider the power factor of the load.

Portable UPS power supply should not be inductive load, and some units want to use high-power fans and air conditioners to check the performance and output power of portable UPS power supply when it is used to check the machine. This is inappropriate. Some units will add fans, motors, etc. to a small-power square-wave output portable UPS power supply. This is not acceptable.

The backup square-wave output UPS cannot carry inductive loads, and the load is best at about 50% of the rated load. Because under this kind of load condition, the 3rd harmonic (150Hz sine wave) component in the 50Hz square wave output waveform can be eliminated, and the current flowing in the DC filter capacitor in the switching power supply can be reduced, and the filter capacitor can be prevented from working due to long-term overcurrent. And damage.

Portable UPS power supply is usually provided with overload and short-circuit automatic protection functions when the inverter is powered. However, when the utility power is supplied, it generally relies on the input AC insurance to perform the task of overload protection, so the user cannot easily increase the utility power. Enter the capacity of the fuse. Otherwise, once a short-circuit accident occurs in the output of the portable UPS power supply, there is a risk that the input fuse will be burnt and the printed circuit board will be burned.