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Analysis of UPS Uninterruptible Power Supply Parameters

Mar 25, 2021

Analysis of UPS Uninterruptible Power Supply Parameters

UPS power supply is a device that carries large currents, and many people will come into contact with it. So, what are the parameters of UPS power supply? At the same time, what should we pay attention to when buying? The following will present the relevant content for your friends as a reference.


1. UPS power supply


UPS (Uninterruptible Power System), that is, uninterruptible power supply, is a constant voltage and constant frequency uninterruptible power supply that contains energy storage devices and uses an inverter as the main component. Mainly used to provide uninterrupted power supply to a single computer, computer network system or other power electronic equipment. When the mains input is normal, the UPS will stabilize the mains and supply it to the load. At this time, the UPS is an AC mains voltage stabilizer, and it also charges the battery in the machine; when the mains is interrupted (accidental power failure) Immediately, the UPS will continue to supply 220V AC power to the load through the inverter conversion method from the power of the battery in the machine, so that the load can maintain normal operation and protect the load software and hardware from damage. UPS equipment usually provides protection for both over-voltage and under-voltage.


Second, what are the parameters of the UPS power supply


The basic parameters of UPS uninterruptible power supply: 1. Load


The load can be divided into three categories, below 10kVA is a small load, 10~60kVA is a medium load, and above 60kVA is a large load;

2. Harmonic content (distortion) of the output voltage


Harmonic voltage will cause noise to the reference voltage in the circuit and low-voltage logic circuits;

3. Step load


When a part of the load is turned on or off, it will cause a step change in the load. Since the UPS cannot instantaneously correct this sudden change in current, the output voltage will change accordingly. Because of the small load, only a few devices are connected, sometimes a 100% step load will appear. The step of medium load does not exceed 50%. However, a large load can only appear in a step load exceeding z5% under abnormal operating conditions. The general inverter design can meet the step load of less than 25%;

4. Non-linear load


Refers to inductive load or capacitive load. In computer systems, nonlinear loads are mainly hosts, printers (especially laser printers) and display terminals; linear loads are mainly disk and tape devices. Generally, small loads are non-linear loads; medium loads are linear and non-linear loads are similar or one of them is slightly larger; and large loads are generally linear loads, because large loads are composed of multiple devices, one after another during operation, and the overall load looks more macroscopic stable;

5. Efficiency


For a large system, the efficiency must be high enough. For example, if a 125kV·A UPS has an efficiency of only 85%, the annual additional cost is equivalent to 30% of the initial investment;

6. Volume


Small and medium-sized UPS require the volume to be as small as possible

7. Noise


The noise level of the UPS uninterruptible power supply should not exceed the noise level required by the environment where it is located.

Three, UPS power capacity specifications


UPS products on the market generally have capacity specifications of 0.5, 0.65, 1, 2, 3, 4, 5, 6, 8, 10, 15, 20, 30, 40, 60, 80, 100, 120, 160, 200 , 300, 400, 500, 600, 800, 1000KVA, etc., and have formed a series of products. Generally, it has passed IS09001 international quality standard certification, UL safety standard and CE anti-electromagnetic interference certification and marking. Most of them use PWM pulse width frequency modulation technology, PIGBT high-efficiency power devices, microprocessor master/slave control technology, etc., which can be connected in parallel with two or more machines. It has the functions of battery testing and maintenance, microcomputer monitoring and monitoring, remote communication, etc.; in the machine configuration, the components are standardized, modular, and interchangeable; it has excellent performance such as wide voltage input, high efficiency output, and strong overload capability.