UPS uninterruptible power supply analysis, UPS uninterruptible power supply supply problems

You have a manual when you buy a UPS.

UPS power supply principle: it is composed of rectifier, inverter, AC static switch and battery pack. At the same time, the inverter outputs a high-quality AC pure power supply for important loads, so that it is not subject to the voltage, frequency and harmonic interference of the mains.

When the mains power is out for some reason, the system automatically switches to the battery pack, the battery is discharged, and the power supply to important equipment is supplied through the inverter. When the mains and the inverter are switched, the control system will detect the synchronization range of the mains in a timely manner, and when the mains does not exceed the limit, the inverter realizes the power supply that is turned on first and then off, so as to ensure the uninterrupted switching of the power supply system.

To put it simply, the working principle of UPS uninterruptible power supply is to ensure the stability of the power grid and the computer system to continue to work after a power failure.

Specifically, it is through AC-DC conversion: the alternating current from the grid is converted into DC voltage through the autotransformer step-down, full-wave rectification, and filtering, which is supplied to the inverter circuit. The AC-DC input has a soft-start circuit to avoid shocks to the power grid when the power is turned on.

DC-AC inverter circuit: It adopts high-power IGBT module full-bridge inverter circuit, which has a large power margin, and the output impedance is particularly small in the output dynamic range, and has the characteristics of fast response. Due to the use of high-frequency modulation current limiting technology and fast short-circuit protection technology, the inverter can work safely and reliably whether it is a transient change of power supply voltage or a negative impact or short circuit.

Control drive: The control drive is the core of the functional control of the whole machine, in addition to providing detection, protection, synchronization and various switching and display drive signals, it also completes the control of SPWM sinusoidal pulse width modulation, due to the use of static and dynamic dual voltage feedback. The dynamic characteristics and stability of the inverter are greatly improved.

How long can the UPS power supply last after a power outage is determined by the power pool, not by the UPS power supply. If it is a small UPS, it is generally less than half an hour. The UPS power supply is just a conversion device and does not produce energy.

When the mains power is normal, the battery inside is charging, and after the power failure, the direct current of the battery is discharged to the load through the UPS, and the energy is from the battery to the load.

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To put it simply, when the grid power supply is available, charge the battery; When the power supply of the grid fails, the battery that has been charged before is taken out to supply power.

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!