Can the UPS power supply host work normally without connecting the battery pack?

by:Power Kingdom     2021-06-10

Can the UPS power supply host work normally without the battery pack?

The so-called UPS uninterrupted power supply system is a device that can take over the continuous supply of electricity from the mains when the power fails. Its power comes from the battery pack. The electronic components have a fast response speed, and the power will continue to be supplied within 4 to 8 milliseconds or without an intermediate period of time at the moment of a power failure.

UPS power supply is a kind of backup power equipment for power failure. It mainly relies on the internal battery to store energy when there is power. When the power fails, the power supply will be automatically started in the battery mode and output to Important equipment is used, so according to common sense, the UPS power supply will not be used if the battery is not connected, at least it will not play the role of power failure protection.

There are exceptions in certain UPS brand models or UPS uninterruptible power supplies with special custom designs. Most UPS power supply standard machines with built-in batteries cannot be started when the battery is not connected, and the entire current circuit is in an open circuit state, which is definitely not usable.

However, most UPS power supply long-term machines with external battery can be started without connecting the battery. The machine can be powered by the mains, but the UPS power battery part will Abnormal alarms all the time to warn that the DC voltage is abnormal or the voltage of the battery part is abnormal. At this time, the UPS power supply can only be used as a voltage stabilizer. There will be no output at the moment of a power outage or an abnormality in the mains, and it will not be able to protect load data and power outages. Supplement the role of backup.

The external battery of the UPS power supply and the internal battery of the UPS: The external battery is outside the UPS power supply and usually has a separate battery cabinet, which is not integrated with the UPS power supply. The capacity of the battery pack or the number of newly added battery packs can achieve the purpose of extending the power source. The built-in battery is in the UPS power supply, and the built-in battery is integrated with the UPS power supply. Generally speaking, the built-in battery of the UPS power supply is relatively small, and the battery capacity installed in it is small, and the battery pack can rarely be expanded.

Expanding extracurricular knowledge: the hidden dangers of UPS sharing battery packs

In the past, there were many manufacturers in the market promoting parallel UPS systems , Adopt the configuration scheme of sharing UPS battery pack. The so-called UPS shared battery pack scheme refers to a solution in which two or more UPS hosts use one or more sets of batteries at the same time.

In actual applications, few customers use shared battery pack solutions. No matter how the UPS manufacturer proves that the technology is reliable, mature and stable, there are always many hidden dangers in the application of the shared battery pack solution:

1. When a group of batteries connected in parallel is short-circuited When the phenomenon occurs, it is equivalent to the short circuit of the rectifiers of two UPSs, which will cause the failure of the two UPSs;

2, when a UPS inverter is short-circuited, due to the shared battery, the two UPSs will be short-circuited. If the rectifiers of two UPSs are connected in parallel, it may cause two UPSs to fail at the same time.

3. Since the rectifiers of the two UPSs are connected in parallel, the DC voltage output by each UPS will have a pressure difference, although the UPS control system can monitor and automatically adjust Voltage, to ensure that the output DC voltage values u200bu200bof the two UPSs are the same, but if the control fails, a circulating current will be generated between the two UPS rectifiers. When a certain value is reached, the UPS rectifiers will automatically shut down, causing a malfunction.

If a shared battery solution is adopted, two independent UPS systems that are redundantly supplied in parallel are virtually connected by batteries to become a system. It is to lose the purpose of redundant parallel connection.

Summary: The number of batteries currently equipped with large and medium-sized UPS power supplies ranges from 3 to 80, or even more. These single batteries are connected by circuits to form a battery pack to meet the needs of the UPS for DC power supply. The UPS host computer is equipped with a proper battery pack, so that the UPS system can be used to its maximum effect.

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