The working principle of the online UPS power supply
When the online UPS power supply is normal in the power grid, the input voltage of the power grid will go through the noise filter to remove the high frequency in the power grid. Interference to obtain pure alternating current, enter the rectifier for rectification and filtering, and convert the alternating current into smooth direct current, and then divide it into two paths, one enters the charger to charge the battery, and the other is supplied to the inverter, which in turn will The DC power is converted into 220V, and the 50Hz AC power is used by the load.
When the mains is interrupted, the input of the AC power has been cut off and the rectifier no longer works. At this time, the battery discharges and transfers the energy to the inverter, and the inverter converts the DC power into AC power for power supply. load usage. Therefore, for the load, although the utility power no longer exists, the load has not been shut down due to the interruption of the utility power at this time, and can still operate normally.
Characteristics of on-line UPS power supply
1. Since the on-line UPS power supply is powered by the machine when the utility power is normal or when the utility power is interrupted When the battery supplies power to the inverter, the power supply to the load is provided by the inverter of the UPS. Because of this, the influence of any voltage fluctuation and interference from the mains grid on the load operation is fundamentally eliminated, and a non-interference regulated power supply to the load is truly realized.
2. The waveform distortion coefficient of the output sine wave of the online UPS power supply is the smallest, generally less than 3%.
3. The online UPS power supply can truly realize uninterrupted power supply to the load when the mains is interrupted. As long as the internal battery can provide energy to the UPS inverter, regardless of whether the mains is interrupted, the online UPS is powered by the inverter to the load. Therefore, in the process from the mains power supply to the mains interruption, there is no conversion action inside the online UPS, and the conversion time for the load power supply is zero.
4. Compared with the backup UPS, the online UPS has excellent output voltage transient characteristics. Generally, when 100% load is loaded or 100% load is unloaded, its output voltage change range is about 1%, and the duration of this change is generally 1~3 cycles.
5. On-line UPS power generally adopts PWM technology above 20kHz, and its noise is small, about 50dB.
6. In the control circuit of the on-line UPS power supply, input transformers, output transformers and opto-coupler devices are used to isolate the “strong current” drive part from the “weak current” control circuit part from an electrical point of view , so the reliability of the circuit has been greatly improved. The failure rate of such UPS is generally very low.
Advantages of online UPS power supply
1. The online UPS has strong protection function, and the output voltage waveform of the inverter is better, generally sinusoidal Wave, and its biggest advantage is that it has strong software functions, which can easily access the Internet and carry out remote control and intelligent management of UPS. It has the strongest suppression ability to mains noise and surge.
2. It can automatically detect whether the external input voltage is within the normal range. If there is any deviation, it can be boosted or stepped down by the voltage regulator circuit to provide a relatively stable sine wave output voltage.
3. Data communication can be carried out between the online UPS and the computer through the data interface. Through the monitoring software, the user can directly monitor the power supply and UPS status from the computer screen, which simplifies and facilitates the management work, and can improve the Reliability of computer systems.
4. Microprocessor control ensures high reliability, and ECO mode provides energy-saving effects.
5. Liquid crystal display screen, the operating parameters are clear at a glance, the design of multiple design protection functions greatly reduces the failure rate and effectively improves the safety and reliability of the UPS power supply.
6. The output power is processed by ups, and the output power is of the highest quality.
Disadvantages of online UPS power supply
The structure is complex and the cost is high.
