What are the differences between online UPS, backup UPS, and interactive UPS uninterruptible power s

To understand the differences between online UPS, backup UPS, and interactive UPS uninterruptible power supply, it is necessary to first understand what dynamic UPS uninterruptible power supply is.

Uninterruptible power supply, originally a rotary generator in the 1960s, has gradually developed into a static all electronic circuit with a certain degree of intelligence with the rapid development of electronic technology, especially power devices and automatic control technology.

The basic function of UPS uninterruptible power supply is to ensure uninterrupted power supply when the mains power supply is interrupted; Always provide high-quality AC power to the load to achieve voltage stabilization Stable frequency Suppress surges Peak Electrical noise Compensate for voltage sag Long term low pressure and other factors interfere.

UPS uninterruptible power supply is divided into dynamic and static types according to its working principle. A dynamic UPS consists of an engine and a generator set. It is driven by AC mains electricity to rotate an AC motor, which in turn drives a coaxial AC generator and an inertia flywheel to rotate at the same speed. The generator supplies power to the load. Due to the inertia of the flywheel, there is no response to the interference caused by short-term voltage fluctuations during the operation of the mains wave, ensuring the stability of the output voltage; The power outage of the mains relies on the inertia of the flywheel to extend the rated voltage supply for another 5 seconds, due to the storage of data information. Later, it developed into internal combustion engine UPS systems, but these types of UPS are bulky and noisy Low efficiency, currently not widely used.

A、 Currently, the most commonly used and frequently used is still static UPS. Static UPS can be divided into three categories based on power supply mode: online, backup, and online interactive.

1. Online UPS power supply: When the input, load, and UPS itself are working normally, the UPS power supply first converts the input AC mains power into DC power through a rectifier, and then inverts the DC power into AC power through an inverter, outputting a standard stable and pure sine wave power supply. That is, under normal conditions, the load receives high-quality sine wave power output by the inverter.

2. Definition of backup UPS power supply: When the input, load, and UPS itself are working normally, the UPS only performs simple boosting, lowering, and filtering of the mains power, and then directly outputs it to the load for use. Only when the input power supply does not meet the requirements, the UPS reverses the DC of the battery into AC power and outputs it to the load for use. That is to say, most of the time, the load is using the input power supply itself or a simply processed input power supply.

3. Interactive UPS power supply: When the mains power supply is in the range of about 150-264 volts, it provides users with a general mains power supply that has been regulated by a ferromagnetic resonance regulator or a transformer tap (which means that low-quality power sources such as frequency fluctuations from the general mains power grid, high waveform distortion caused by "harmonic pollution", and interference from the grid are the actual AC power sources used by users). For this type of UPS, it is only possible to provide users with a true "UPS inverter high-quality sine wave" power supply when the mains power supply voltage is below 150 volts or above 264 volts.

2、 The differences in performance between linear UPS, backup UPS, and interactive UPS uninterruptible power supply:

The main difference between the two is that the online power output is through an inverter, which has functions such as isolation and shaping, while the backup output is directly output when there is mains power, and the inverter output is usually square wave when the mains power is cut off.

The advantages of backup UPS power supply are high operating efficiency, low noise, and relatively cheap price. It is mainly suitable for situations where the power supply quality is not high due to the low fluctuation of the mains wave.

Compared with backup UPS power supply, online UPS power supply has significantly better power quality because it can achieve voltage stabilization, frequency stabilization, suppression of surges, spikes, electrical noise, compensation for voltage sag, and long-term low voltage. Moreover, when switching from mains power supply to battery power supply, the conversion time is zero