UPS power battery charging method and the advantages of fast charging. The
six charging methods of UPS power batteries mainly include: constant current
charging, constant voltage charging, fast charging, balanced charging, constant
voltage current limiting charging, smart charging, etc. UPS power batteries play
a very important role in daily life and work. Today, the editor will introduce
to you the UPS power battery charging method and the advantages of fast
charging.
As an important component of UPS power systems, batteries have penetrated
into various industries and will play an increasingly important role. For some
special equipment, a long-delay UPS power battery is required. In order to meet
its uninterrupted power supply requirements, it is necessary to increase the
capacity of the internal battery of the UPS or connect a large-capacity battery
outside the UPS. Ordinary chargers can no longer meet such requirements, and the
necessity of fast charging is particularly prominent.
Introduction to UPS power battery charging methods
■UPS constant current charging
As the name suggests, constant current charging refers to charging the UPS
power battery with a fixed current. If the charging current is set to a large
value, at the beginning of charging, compared with other charging methods, it
will be closer to the optimal charging curve. However, as the As the charging
time increases, the charging will become increasingly unable to meet the
charging requirements of the battery.
■Constant voltage and current limited charging
Constant voltage current-limiting charging is a charging method that is
mainly used to remedy the shortcomings of excessive initial charging current
during constant voltage charging. It uses a resistor in series between the
charging power source and the battery to be charged to automatically adjust the
charging current. When the charging current is too large, the voltage drop
across the current-limiting resistor is also large, thereby reducing the
charging voltage; when the charging current is small, the voltage drop across
the current-limiting resistor is also very small, so that the charging current
is automatically adjusted so that does not exceed a certain limit. Since most of
the energy is consumed in the current limiting resistor, the energy utilization
rate is reduced.
■UPS fast charging
Fast charging refers to a charging method with high current. Fast charging
does not produce a large number of bubbles and does not generate heat, thus
shortening the charging time. At present, the commonly used fast charging mainly
includes pulse charging and high current speed reduction and fast charging.
The battery is charged in stages. In the initial stage, large current
constant current charging is used. When the battery charge level reaches a
stage, a smaller current constant current charging is used, and finally it is
switched to constant voltage charging to stabilize the DC bus voltage. the float
voltage value. It also detects the ambient temperature and performs temperature
compensation on the battery's float voltage based on stable changes to prevent
overcharging or undercharging of the battery.
■Smart charging
Smart charging is currently the most advanced charging method. The
principle is to dynamically track the acceptable charging current of the UPS
power battery during the entire charging process. Apply du/dt technology, that
is, the charging power supply automatically determines the charging process
parameters according to the state of the battery, so that the charging current
is always kept close to the acceptable charging battery curve of the battery,
and the battery is charged almost without gas precipitation, thereby protecting
the battery.
Advantages of fast charging of UPS power batteries
(1) Charging time is greatly shortened and charging efficiency is
doubled.
According to the conventional charging method, the initial charging of a
new lead-acid UPS power battery requires 72-100 hours, and it must be repeatedly
charged and discharged several times, so that all active materials on the plate
can be reduced to lead dioxide and spongy lead, reaching their rated value.
capacity. Ordinary charging using this method also requires more than 20 hours.
When using a fast charger to initially charge a new battery, it can reach its
rated capacity in no more than 10 hours, and normal charging should not exceed 3
hours.
(2)Can increase battery capacity
Due to the use of fast charging technology, it can not only remove various
polarization voltages generated around the plates, but also increase the depth
of chemical reactions on the plates and fully reduce active substances, thereby
increasing the capacity of the UPS power battery.
(3) The desulfurization effect is significant
Fast charging outputs large current pulses, so it can activate some
substances on the surface of the plates that have been vulcanized and cannot be
reduced, and can even restore some UPS power batteries that cannot be charged
due to vulcanization.
(4) Save electricity
This is obvious, shortening the charging time itself saves electricity.
Take the initial charging of a new battery as an example. When charging slowly
with a small current, it needs to consume 8 times the energy of the battery
capacity to complete the initial charge (not including the energy consumed by
several charge and discharge cycles). Compared with fast charging, , only
consumes half of the electrical energy.
UPS power supply battery operation precautions
The UPS power battery should be placed away from direct sunlight and leave
enough ventilation space. At the same time, it is prohibited to connect
inductive loads to the UPS output port.
When using UPS batteries, be sure to comply with the relevant provisions of
the manufacturer's product manual to ensure that the connected live wires,
neutral wires, and ground wires meet the requirements. Users are not allowed to
change their mutual order at will.
Strictly follow the correct startup and shutdown sequence to avoid the UPS
power supply from failing to work normally due to large fluctuations in the
initial voltage output of the UPS power supply when the load is suddenly added
or reduced.
It is prohibited to frequently turn off and on the UPS power supply. It is
generally required to wait at least 6 seconds before turning on the UPS power
supply after turning off the UPS power supply. Otherwise, the UPS power supply
may enter a "start-up failure" state, that is, the UPS power supply enters a
state where there is no mains power output. , and there is no inverter output
state.
Overload use is prohibited. The manufacturer recommends that the maximum
starting load of the UPS power supply should be controlled within 80%. If it is
used overloaded, the inverter transistor will often break down in the inverter
state, so the load should be controlled between 30% and 60%. % rated output
power range is the best working mode.
Regularly perform maintenance on the UPS power battery: remove dust inside
the machine, measure the voltage of the battery pack, replace unqualified
batteries, check the fan operation and detect and adjust the UPS system
parameters, etc.
summary:
The above are the advantages of UPS power supply battery charging methods
and fast charging. When choosing a UPS power supply, you must be clear about the
actual situation of the battery equipped with the UPS power supply system.
Choose a UPS power supply with an external large-capacity battery to ensure that
it can work for a long time after a power outage.
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