What are the online UPS power control technologies? Online UPS power supply has a voltage stabilizing effect and can provide power supply at the same time. As an energy storage device, it has a wide range of corresponding application fields. Of course, when using this type of UPS power supply, the relevant control and protection technologies should be clarified. Because only in this way can the related performance of UPS power supply be better utilized.

　　Online UPS power supply means that regardless of whether the grid voltage is normal or not, the AC voltage used by the load must pass through the inverter circuit, and the inverter is always working. Therefore, when there is a power outage, the UPS can immediately convert its stored electrical energy into alternating current through the inverter to supply power to the load, thereby achieving the switching goal of zero interruption of the output voltage.

　　What are the online UPS power control technologies?

　　The online UPS power control function is basically controlled by the CPU's internal program. Due to the invisibility of the program, many UPS power control principles are difficult for everyone to understand. Next, UPS manufacturers will talk to you about online UPS power control technology based on years of UPS research and development experience.

　　1.Slow boot

　　When the online UPS power supply is turned on or the system is reset (including overload release, automatic restart, etc.), the CPU controls the UPS power supply to slowly increase the inverter voltage, increasing the inverter voltage by 3V every 32m until it stops at 220V.

　　2. Voltage chasing

　　After the slow start, the inverter voltage has not yet been switched to external output. In order to prevent the mains power from being poured into the UPS. When the mains power is normal, the CPU controls the inverter voltage to chase the mains input voltage. The inverter voltage increases and decreases every 128m according to the mains voltage. 3V If the mains voltage is higher than 280V, it will only catch up to 280V. If the mains voltage is lower than 160V, it will only catch up to 160V.

　　3. Mains voltage detection and control

　　The CPU reads the mains voltage value every 16m. When the mains voltage reading is lower than 160V or higher than 280V five times in a row, it is deemed that the mains voltage input is abnormal; only when the mains voltage reading is restored five times in a row When the voltage reaches 170~270V, the mains power input is considered normal. When the mains input is normal, the UPS works in the mains inversion state;

　　When the mains voltage is lower than 160V or higher than 280V, the UPS power supply immediately transfers to the battery inversion state; in order to prevent the mains power from switching back and forth, the online UPS power supply only transfers to the mains power when the mains power returns to 170~270V. Inverse state.

　　4. Mains frequency detection and control

　　The purpose of detecting the frequency of the mains is to serve as the basis for inverter phase locking. By adjusting the zero-crossing point of the inverter, the inverter phase is adjusted so that the inverter output and the mains input in the mains state are basically at the same frequency and phase. When the mains power is turned on, the UPS detects the frequency of the input mains power as the frequency of the inverter output; when it is turned on on battery, the inverter output frequency is set based on the last output frequency.

　　When the mains power is normal, phase locking is performed. The inverter frequency first catches up with the mains frequency, and then chases the phase after the frequency is the same. By changing the inverter frequency, the inverter and the mains are in phase. After phase locking, the phase difference between the inverter and the mains is less than 3 degrees, and the frequency error is less than 0.01HZ. When the mains frequency exceeds the range of 47~53HZ, the UPS does not perform phase locking and immediately switches to the battery inverter state. Only when the mains frequency When the frequency returns to 48~52HZ, the online UPS power supply performs phase lock again and enters the mains inversion state.

　　5. Online UPS power supply digital control technology

　　Intelligence and networking are the development trends of UPS power supply, and digital control is the basis of its development, and the digitalization of online UPS is the mainstream of today's UPS. Digital control technology is used to realize parallel expansion and parallel redundancy functions, providing users with flexibility in power planning and safer guarantees. It can ensure the stability and reliability of the output UPS power supply and allow the load to operate safely.

　　The above is an introduction to online UPS power control technology. Online UPS can provide a better power environment for the load, no matter from the regulated output range, frequency range, input noise filtering, or even zero conversion between mains mode and battery mode. Considering time and other aspects, online UPS is the best UPS structure. Therefore, important equipment or equipment with demanding power environment requirements should almost all use online UPS.

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