How does a UPS power supply work?

UPS classification and working principle.

UPS is classified as offline (OFF) according to the way it works

line) and line-interactive. Let's talk about the working principles of the three UPSs respectively:

1. Offline UPS

Offline UPS is usually in the state of battery charging, and the inverter switches to the working state urgently when the power is off, and converts the direct current provided by the battery into a stable AC output, so the offline UPS is also called the backup UPS. However, this kind of UPS has a handover time problem, so it is not suitable for use in places where the power supply cannot be interrupted. But in fact, this switching time is very short, generally between 2 and 10 milliseconds, and the switching power supply of the computer itself should be able to maintain about 10 milliseconds when the power is off, so the personal computer system generally does not have problems because of this switching time.

The ** type UPS keeps its inverter in working condition, it first converts the external alternating current into direct current through the circuit, and then converts the direct current into high-quality sine wave alternating current through the high-quality inverter and outputs it to the computer. **The main function of UPS in the power supply condition is to stabilize the voltage and prevent radio wave interference; In the event of a power outage, a backup DC power supply (battery pack) is used to supply power to the inverter. Since the inverter is always working, there is no problem with switching time, and it is suitable for applications with strict requirements for power supply.

3. Online interactive UPS

This is an intelligent UPS, which can automatically detect whether the external input voltage is within the normal range, and if there is a deviation, the voltage regulator circuit can boost or step down the voltage to provide a relatively stable sine wave output voltage. And it can communicate with the computer through the data interface (such as RS-232 serial port), through the monitoring software, the user can directly monitor the power supply and UPS status from the computer screen, simplify, facilitate the management work, and can improve the reliability of the computer system.

UPS power system knowledge.

The role of UPS power supply:

UPS power supply.

That is, the uninterruptible power supply is to connect the battery (mostly lead-acid maintenance-free battery) with the host and pass through the host inverter.

and other module circuits convert direct current into mains power system equipment.

UPS is mainly used for a single computer, computer network system or other power electronic equipment such as solenoid valves, pressure transmitters.

and so on to provide stable, uninterrupted power**.

When the mains input is normal, UPS will stabilize the mains voltage and give it to the load.

In this case, the UPS is an AC electric voltage regulator.

At the same time, the UPS 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.

Keep the load working properly and protect the load software and hardware from damage. UPS equipment is usually protected against either too high or too low voltage.

How to use UPS power supply:

1. The UPS power supply itself has a plug, which is a plug connected to the mains, which can be connected to the mains power at home. On the back of it we are able to see that there are also three power outlets.

The two on the left are its output ports, that is, the output power supply is used to connect to external devices, for example, one can be connected to the computer host, and one can be connected to the computer monitor.

2. The two sockets on the back of the UPS power supply can not only be directly connected to the equipment, but also connected to the socket, and some equipment can be connected to the socket, such as computers or other electrical appliances.

Although it can be connected to the socket and then connected to multi-point equipment, this also depends on the power of the uninterruptible power supply, which cannot be overloaded, so that it can not play a protective role, and it will affect its service life.

3. Some UPS power supplies also have sockets for connecting to printers, which can be directly connected to the printer; Plus, it has a fuse.

If it is in the case of overload, it can play a protective role.

If you find that the UPS power supply is not working properly, you should see if its fuse is burned out; After connecting the sockets in the back to the wire, and looking at the front of it, it has three indicators, which are fault, battery and mains.

1. UPS, also known as uninterruptible power supply, is a system equipment that connects the battery with the host and converts direct current into mains power through module circuits such as the host inverter. UPS power supply is divided into three types, namely, ** type, backup type, and online staggered type.

2. The working principle of ** UPS, when the ** type UPS is normally supplied to the power grid, the voltage input of the power grid is removed from the high-frequency interference in the power grid through the noise filter, and pure alternating current can be obtained, which enters the rectifier for rectification and filtering, and converts the alternating current into smooth direct current, and then divides it into two ways, one enters the charger to charge the battery, and the other supplies the inverter, but the inverter converts the direct current into 220V, 50Hz AC power for the load. When the mains power is interrupted, the input of alternating current has been cut off, and the rectifier is no longer working, at which time the battery discharge transmits the energy to the inverter, and then the inverter converts the direct current into alternating current for the load to use. Therefore, for the load, although the mains power no longer exists, the load is not interrupted due to the mains power outage at this time, and it can still operate normally.

3. The working principle of the backup UPS, when the power supply of the power grid is normal, one mains charges the battery through the rectifier, and the other mains is initially stabilized through the automatic voltage regulator, absorbing part of the power grid interference, and then directly supplying power to the load by the bypass transfer switch. At this time, the battery is in a charging state until the battery is fully charged and transferred to the floating state. UPS is equivalent to a voltage regulator with poor voltage regulation, but it only improves the amplitude fluctuation of the mains voltage, and does not make any adjustments to the "electrical pollution" such as frequency instability and waveform distortion on the power grid.

When the grid voltage or grid frequency exceeds the input range of UPS, that is, in abnormal circumstances, the input of alternating current has been cut off, the charger stops working, the battery is discharged, and the inverter starts to work under the control of the control circuit of the large control circuit, so that the inverter generates 220V, 50Hz AC current, and the UPS power supply system is converted to continue to supply power to the load by the inverter. The inverter of the backup UPS is always in the backup power supply state.

4. The working principle of online staggered UPS, when the mains is normal, the mains is directly supplied to the load, when the mains is low or high, the output is output after stabilizing the voltage through the stabilized line of the inner limb of the UPS, and when the mains is abnormal or the power is out, it is converted to battery inverter power supply through the transfer switch. Its characteristics are: there is a wide input voltage range, low noise, small size and other characteristics, but there is also a switching time, but compared with the general backup UPS, this model has a strong protection function, the inverter output voltage waveform is better, generally a sine wave.