Advantages and disadvantages of different types of Uninterruptible Power Supplies (UPS power supplie

Uninterruptible Power Supply (UPS) is a constant voltage and frequency Uninterruptible Power Supply (UPS) with energy storage device and inverter as the main component. It is mainly used to provide Uninterruptible Power Supply (UPS) to a single computer, computer network system or other power electronic equipment.

When the mains input is normal, the Uninterruptible Power Supply (UPS) stabilizes the mains and supplies it to the load. At this time, the Uninterruptible Power Supply (UPS) is an AC mains voltage stabilizer. At the same time, it also charges the battery in the machine. When the mains power is interrupted (accidental power outage), the Uninterruptible Power Supply (UPS) immediately uses the power of the battery in the machine to continue to supply 220V AC to the load through the inverter conversion method, so that the load maintains normal operation and protects the load software and hardware from damage. (In simple terms, the Uninterruptible Power Supply (UPS) is a large power bank). Uninterruptible Power Supply (UPS) is widely used in the IT industry and special precision equipment, covering all aspects of information collection, transmission, processing, storage and application. Its importance continues to increase with the increasing importance of information application.

1. Offline Uninterruptible Power Supply (UPS):

Offline Uninterruptible Power Supply (UPS), also known as backup Uninterruptible Power Supply (UPS). Normally, the mains power is directly supplied to the load through the bypass, and the inverter inside the machine is in a stopped working state. At this time, the Uninterruptible Power Supply  (UPS power supply) is essentially equivalent to a mains voltage stabilizer with poor performance. In addition to improving the amplitude fluctuation of the mains voltage, it has basically no improvement on the adverse effects such as voltage frequency instability, waveform distortion, and interference from the power grid. Only when there is a power outage, the battery energy is converted into AC through the inverter to provide power to the load.

Characteristics of offline Uninterruptible Power Supply (UPS):

a. When the mains power is normal, the offline Uninterruptible Power Supply  (UPS power supply) does not process the mains power and directly outputs it to the load, so the suppression ability of the mains noise and surge is poor;

b. There is a conversion time

c. Poor protection performance

d. Simple structure, small size, light weight, easy control, and low cost.

2. Online Uninterruptible Power Supply (UPS):

When the mains is supplying power normally, it first rectifies the AC power of the mains into a DC power supply, then performs pulse width modulation and filtering, and then converts the DC power back into a sine wave AC power supply through an inverter to supply power to the load. Once the mains is interrupted, the DC power provided by the battery immediately supplies the sine wave AC power to the load through the inverter. Therefore, for an online Uninterruptible Power Supply  (UPS power supply), under normal circumstances, whether there is mains or not, it is powered by the inverter of the Uninterruptible Power Supply  (UPS power supply) to supply power to the load, thus avoiding all the effects caused by voltage fluctuations and interference of the mains grid. Obviously, the power supply quality of an online Uninterruptible Power Supply  (UPS power supply) is significantly better than that of a backup UPS power supply. Because it can achieve stable frequency and voltage supply to the load, and when switching from mains power supply to battery power supply, the conversion time is zero. It truly provides users with a pure sine wave power supply with stable voltage and frequency, thereby providing power protection that meets the needs of the network system.

Features of online Uninterruptible Power Supply (UPS):

a. The output power is processed by UPS, and the output power quality is high;

b. No conversion time;

c. Complex structure and high cost;

d. The protection performance is the best, and the ability to suppress AC noise and surge is strong.

3. Online interactive Uninterruptible Power Supply (UPS):

Online interactive Uninterruptible Power Supply (UPS) is also called three-terminal UPS, which uses an industrial frequency transformer. From the perspective of energy transfer, its transformer has three ports for energy flow.

Port 1 is connected to the AC input;

Port 2 is connected to the battery through a bidirectional converter;

Port 3 output.

When the AC is supplied, the AC flows into the transformer through port 1, and the appropriate transformer tap is selected under the control of the voltage stabilizing circuit. At the same time, the output voltage on port 3 is adjusted by the energy conversion of the battery under the action of the bidirectional converter of port 2, so as to achieve a better voltage stabilization effect;

When the AC is off, the battery supplies power to the transformer through the bidirectional converter through port 2 to maintain the AC output on port 3. In the process of transformer tap switching, the bidirectional converter of the online interactive Uninterruptible Power Supply  (UPS power supply) works as an inverter. The battery is powered, so the output voltage can be uninterrupted, and there is no conversion time in the switching process from mains power supply to battery power supply.

The circuit implementation of the online interactive Uninterruptible Power Supply  (UPS power supply) is simple, and there is no separate charger, which brings about a reduction in production costs and an improvement in reliability. This type of product does not have AC/DC and DC/AC conversion when working with mains power supply, which improves the efficiency of the whole machine.

The online interactive Uninterruptible Power Supply  (UPS power supply) combines many advantages of the backup Uninterruptible Power Supply  (UPS power supply) and the online Uninterruptible Power Supply  (UPS power supply) well, and is a very good form of conversion. However, because it uses an industrial frequency transformer, it has the problems of being bulky and large in size.

Features of online interactive Uninterruptible Power Supply  (UPS power supply):

a. Bidirectional converter design, short UPS battery recharge time;

b. Conversion time;

c. Complex control structure, high cost;

d. Protection performance is between online and offline Uninterruptible Power Supply  (UPS power supply), poor ability to suppress mains noise and surge.