UPS Uninterruptible Power Supply Technical Questions 100

There are many kinds of PFC circuits, what you are talking about is only one of them, and it is also a relatively old one, through this modulated switching circuit, the current absorbed by the rectifier is the sine wave current, and it is synchronized with the voltage, and the function of PFC is realized. Another function of the DC DC boost chopper is to increase the voltage of the DC bus to meet the requirements of the peak output of AC current, so that the output of the UPS no longer needs a transformer.

Another new type of PFC current is the direct use of IGBT rectification, through the switching process to absorb the sine wave current and the purpose of voltage (PFC). Of course, there will also be a DC DC boost chopper behind this rectifier to increase the DC bus voltage.

There is ripple after rectification, and the voltage and current are separated by the phase, so the power factor decreases, and the PFC circuit is required to increase the power factor.

Abstract:UPS uninterruptible power supply is a kind of emergency power supply equipment, which is widely used in hospitals, banks, computers and other fields, and has the advantages of uninterruptible power supply, small space occupation, easy installation, operation and installation, etc., but also has the disadvantages of narrow input range and poor output power supply quality. The power supply time of uninterruptible power supply is generally not long, it is related to the battery capacity, load size, sliding hole ambient temperature, battery discharge cut-off voltage and other factors, and then let's learn about it.

Advantages of UPS uninterruptible power supply.

1. UPS uninterruptible power supply can automatically switch the power supply mode without manual operation, and take different channels in the case of power and power, which is conducive to reducing energy waste.

2. The UPS power supply system only starts to run when the power grid is out of power, so that it will not interfere with the normal power supply of the power grid, which is very safe.

3. During installation, you only need to connect the backup power supply to the circuit, which has a specific port for connection, which can be connected to different interfaces for different devices.

4. UPS uninterruptible power supply will not take up too much space, and it is easy to find the installation location. When the equipment running space is small, you can choose a product similar to the size of a computer host.

5. The main advantage of UPS uninterruptible power supply is mainly the ability to carry the power supply continuously, when the mains power is normal, the UPS alternating current is rectified into direct current, and then the direct current is reversed into stable and impurity-free alternating current, which is supplied to the load. On the contrary, the direct current can be converted into stable and impurity-free alternating current, which can continue to be used for the load.

Disadvantages of UPS uninterruptible power supply.

1. When the electrical equipment has strict requirements for the power supply interval, it is not advisable to use uninterruptible backup power supply. This is because the UPS power supply method has a long reaction time, so equipment that is sensitive to charging and discharging cannot use this type of power supply.

2. The input range of UPS uninterruptible power supply is narrow, and the output power supply quality is poor, so the comprehensive availability is poor. If the power of the device is large and requires more power, it is not appropriate to use a backup power supply.

How long does an uninterruptible power supply last.

The power supply time of UPS uninterruptible power supply is not unlimited, and this time is affected by factors such as the size of the stored energy of the battery itself, the size of the load, the ambient temperature, and the battery discharge cut-off voltage. Generally speaking, the UPS uninterruptible power supply time of small home computers can be maintained for about 20 minutes, and the battery pack can be set up according to the requirements of large kilowatt UPS, and the power supply time can reach more than 1 hour, and some can even supply power for 10 hours.

How long can UPS uninterruptible power supply be used should be calculated in combination with the actual situation. Generally speaking, UPS uninterruptible power supply manufacturers will adjust the high power and emergency time on the basis of consumer requirements, which can not only ensure that the load can start safely and smoothly, but also have a better backup time. If an AC power outage occurs, then in the precious time of UPS's battery power supply, what the user needs to do is to quickly restore the AC power, such as enabling the standby AC power circuit, enabling the diesel generator to generate electricity, the letter is really not good, so you can only save the disk urgently, save the fruits of labor, and wait for the AC power to return to normal before continuing.

The main advantage of an uninterruptible power supply is its uninterruptible power supply capability. When the AC input of the mains power is normal, the UPS rectifies the AC power into DC power, and then converts the DC power into stable and impurity-free AC power for the rear load. Once the AC input of the mains is abnormal, such as undervoltage or power outage or frequency abnormality, then the UPS will enable the backup energy-battery, and the rectifier circuit of the UPS will be shut down, and accordingly, the DC power of the battery will be inverted into stable and impurity-free AC power, which will continue to be used for the rear load.

This is where UPS's uninterruptible power supply capability comes in. Figure 1 is a typical UPS block diagram.

Of course, the uninterrupted power supply time of the UPS is not unlimited, and this time is limited by the amount of energy stored by the battery itself. If there is an AC power outage, then in the precious time of UPS's battery power, what you need to do is to quickly restore the AC power, such as enabling the backup AC power circuit and enabling the diesel generator to generate electricity.

The 4 working modes of UPS power supply, the old electrician will teach you step by step, practical electrician technology!

It is a kind of uninterruptible power supply with energy storage device and constant voltage and constant frequency with inverter as the main component.

It is mainly used to provide uninterrupted power to a single computer, computer network system, precision instrument, data center or other power electronic equipment**.

When the mains input is normal, UPS will stabilize the mains voltage to the load, and the UPS at this time is an AC voltage regulator, and it also charges the battery in the machine; When the mains power is interrupted or the power is cut off in an accident, the UPS immediately continues the power of the battery in the machine to the load through the method of inverter conversion, so that the load can maintain normal operation and protect the load software and hardware from damage.

UPS equipment usually provides strong protection against either excessive or low voltage.

UPS (Uninterruptible Power System Uninterruptible Power Supply), that is, uninterruptible power supply, is a system equipment that connects the battery (mostly lead-acid maintenance-free battery) to the host and converts direct current into mains power through module circuits such as the host inverter. It is mainly used to provide stable and uninterrupted power to a single computer, computer network system or other power electronic equipment such as solenoid valves, pressure transmitters, etc. When the mains input is normal, UPS will stabilize the mains voltage and use it to the load, at this time, the UPS is an AC electric regulator, and it also charges the battery in the machine; When the mains power is interrupted (accidental power outage), UPS immediately converts the direct current energy of the battery to the load through the inverter switching conversion method**220V AC power, so that the load can maintain normal operation and protect the load software and hardware from damage.

UPS equipment is often protected against either too high or too low voltage.