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

Mar 05, 2021

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

Can the UPS power supply host work normally without connecting the battery pack? The main advantage of UPS uninterruptible power supply lies in its uninterrupted power supply capability. The battery is an indispensable part of the UPS. The UPS charges the battery when the grid voltage is normal. When the grid voltage is abnormal or power failure, the battery supplies power to the load. The UPS inverts the battery from DC to AC output.

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

The so-called UPS uninterruptible power supply system is a device that can take over the continuous supply of electricity from the mains when the power is out. Its power comes from the battery pack. Due to the fast response of electronic components, the moment of power outage is within 4 to 8 milliseconds or no intermediate time. Continue to supply electricity.

UPS power supply is a kind of backup power equipment during power failure. It mainly relies on the internal battery to store energy when there is power. When the power fails, it will automatically start power supply in battery mode and output to important equipment. Therefore, it is affirmative to not connect the battery UPS power supply according to common sense. Those that cannot be used will at least not be able to protect against power failure.

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 battery cannot be started without connecting the battery. The entire current circuit is in an open circuit state, and it must not be used.

However, most UPS long-acting machines with external batteries can be started without the battery connected and can be powered by the mains, but the battery part of the UPS power supply will always give an abnormal alarm to warn that the DC voltage is abnormal or the battery voltage 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 failure or an abnormality in the mains, and it will not play the role of protecting the load data and supplementing the power failure.

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 UPS power supply is relatively small, the battery capacity installed in it is small, and the battery pack can rarely be expanded.

Expansion of extracurricular knowledge: hidden dangers of UPS sharing battery packs

There are many manufacturers in the market promoting parallel UPS systems and adopting the configuration scheme of sharing UPS battery packs. 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 use, few customers use the shared battery pack solution. No matter how the UPS manufacturer proves how reliable, mature and stable the technology is, there are always many hidden dangers in the application of shared battery pack solutions:

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

2. When a UPS inverter is short-circuited, due to the shared battery, the rectifiers of the two UPSs are connected in parallel, which may cause both UPSs to fail at the same time.

3. Since the rectifiers of 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 the voltage to ensure that the output DC voltage values of the two UPSs are the same, if If the control fails, a circulating current is generated between the two UPS rectifiers. When a certain value is reached, the UPS rectifier will automatically shut down, causing a malfunction.

However, if the shared battery solution is adopted, two independent UPS systems that are redundantly connected in parallel for power supply are virtually connected by batteries to become a set of systems, which is the purpose of losing the redundant parallel connection.

Summary: At present, the number of batteries 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.