On-line Uninterrupted Power Supply

Online UPS means that no matter 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 in working state. Therefore, when the power is off, the uninterruptible power supply (UPS backup power supply) can immediately convert its stored electric energy into AC power through the inverter to supply power to the load, thereby achieving the switching goal of zero output voltage interruption.

1. What is an online uninterruptible power supply (UPS backup power supply):

Online means that no matter whether the grid voltage is normal or not, the AC voltage used by the load must pass through the inverter circuit, that is, the inverter circuit is always in working state, and the online uninterruptible power supply (UPS backup power supply) is generally a double conversion structure. The so-called double conversion means that when the uninterruptible power supply (UPS backup power supply) is working normally, the electric energy is converted twice after AC/DC and DC/AC before supplying the load.

This uninterruptible power supply (UPS backup power supply) always keeps its inverter in working state. It first converts the external AC power into DC power through the circuit, and then converts the DC power into high-quality sinusoidal AC power through a high-quality inverter to output to the computer. The main function of the online uninterruptible power supply (UPS backup power supply) under power supply conditions is to stabilize voltage and prevent radio interference, and manage battery charging at the same time; when there is a power outage, the backup DC power supply (battery pack) is used to power the inverter. Since the inverter is always working, there is no switching time problem, which is suitable for occasions with strict requirements on power supply.

2. Working principle of online uninterruptible power supply (UPS backup power supply):

When the online uninterruptible power supply (UPS backup power supply) is in normal power supply of the grid, the voltage input from the grid passes through the noise filter to remove the high-frequency interference in the grid to obtain pure AC power, enters the rectifier for rectification and filtering, and converts the AC power into smooth DC power, and then divides into two paths, one enters the charger to charge the battery, and the other supplies the inverter, and the inverter converts the DC power into 220V, 50Hz AC power for load use.

When the city power is interrupted, the input of AC power has been cut off, and the rectifier no longer works. At this time, the battery discharges and transmits energy to the inverter, and then the inverter converts the DC power into AC power for load use. Therefore, for the load, although the mains power no longer exists, the load has not stopped operating due to the mains power outage and can still operate normally.

3. Features of online uninterruptible power supply (UPS backup power supply):

1). Since the online uninterruptible power supply (UPS backup power supply) provides power to the load by the UPS inverter, whether it is when the mains power is normal or when the mains power is interrupted and the internal battery supplies power to the inverter, it fundamentally eliminates the impact of any voltage fluctuations and interference from the mains power grid on the load operation, and truly realizes interference-free stable power supply to the load. This is obviously not something that any anti-interference AC voltage-stabilized power supply can solve. When the mains voltage varies from 180 to 250V, its output voltage stability range can reach 220V ± 3%, and the output voltage stability range of the online uninterruptible power supply (UPS backup power supply) produced by CNKHZ can reach ± 1%.

2). The waveform distortion coefficient of the output sine wave of the online uninterruptible power supply (UPS backup power supply) is the smallest, generally less than 3%.

3). When the mains power is interrupted, the online uninterruptible power supply (UPS backup power supply) can truly realize uninterruptible power supply to the load. As long as the internal battery can provide energy to the UPS backup power supply inverter, the online uninterruptible power supply (UPS backup power supply) will supply power to the load from the inverter regardless of whether the mains power is interrupted. Therefore, in the process from mains power supply to mains power interruption, there is no conversion action inside the online uninterruptible power supply (UPS backup power supply), and its conversion time for power supply to the load is zero.

4). Compared with the backup uninterruptible power supply, the online uninterruptible power supply (UPS backup power supply) has excellent output voltage transient characteristics. Generally, when the load is loaded at 100% or unloaded at 100%, its output voltage changes in the range of about 1%, and the duration of this change is generally 1 to 3 cycles.

5). The online uninterruptible power supply (UPS backup power supply) generally adopts PWM technology above 20kHz, and its noise is relatively small, about 50dB.

6). In the control circuit of the online uninterruptible power supply (UPS backup power supply), input transformers, output transformers and optocouplers are used to isolate the "strong current" drive part from the "weak current" control circuit part from an electrical perspective, so the reliability of the circuit is greatly improved. The failure rate of this UPS is generally very low.

4. Working mode of online uninterruptible power supply (UPS backup power supply):

When the mains power is normal, the mains power is supplied to the load through the surge absorption filter circuit → AC to DC circuit → DC to AC circuit → and the AC output is converted to supply the load, and the battery is charged at the same time; once the microprocessor control circuit detects that the mains power is interrupted, the battery is immediately discharged → DC to AC circuit → and the AC output is converted to supply the load. If the microprocessor control circuit detects a UPS failure, the UPS will jump to the bypass through the relay, and the load power will be supplied by the mains power, and a sound will be issued to warn the user.

5. Advantages of online uninterruptible power supply (UPS backup power supply):

Online uninterruptible power supply (UPS backup power supply) is also known as ON LINE UPS. Most UPS have strong software functions, which can easily access the Internet for remote control and intelligent management of UPS.

The real online type is: floating charge and inversion at the same time, that is, one side is the charging circuit, the other side is the inverter, and the middle is the battery. There is no need for microprocessor circuit detection and switching, and 0 switching time. In addition to the traditional online functions, the CNKHZ online uninterruptible power supply (UPS backup power supply) series also takes into account users who require extremely high reliability. The design of multiple protection functions greatly reduces the failure rate, effectively improves the safety and reliability of power use, and provides safe and worry-free power protection for users' most important equipment.

6. Performance of online uninterruptible power supply (UPS backup power supply):

1). Sine wave output:Whether in AC mode or battery mode, it can output low-distortion sine wave power to provide the best power protection for users' load equipment.

2). Zero conversion time:When the mains power is cut off or restored, the UPS switches between the mains mode and the battery mode without any conversion time, which effectively ensures the reliability of load operation.

3). Input zero-live wire detection function:In order to avoid the reverse connection of the zero-live wire of the UPS mains input, the machine has the function of zero-live wire reverse connection detection.

4). Humanized bypass output:In order to avoid the user letting the UPS work in BYPASS MODE without turning it on, causing the mains power to be interrupted, and the UPS and the equipment are abnormally shut down. The UPS inputs normal mains power and has no bypass output by default. It must be turned on to have normal inverter output.

5). Input power correction:The UPS has an input power correction function. Under full load, the input power can reach more than 0.99, so that the user's power grid environment will not be polluted.

6). DC startup:In the state of mains power outage, if you need to use UPS to start the computer or other load equipment, the UPS can directly use the battery for DC startup, making the use of UPS more convenient and reliable.

7). Bypass protection:The bypass power supply function greatly enhances the emergency handling capability of UPS. At the same time, when the user's load equipment has special requirements for the power supply, such as the voltage cannot be too high, UPS provides bypass power supply voltage over-high protection to protect the user's load equipment from high voltage danger.

8). Automatic start function:When the mains power is abnormal, the battery mode is entered until the power is cut off, and the UPS will shut down. When the mains power returns to normal, the OYM UPS will automatically start and power on normally without the user turning on the machine one by one.

9). Long-term power supply design:UPS provides a full range of long-term machines for users to choose from. The configuration of suitable battery packs can meet the user's discharge time requirements under different power grid environments.

10). Long-term machine has strong charging capacity:In addition to the extended discharge time, the UPS long-term machine also has strong battery recharge capacity.

11). Self-check function:UPS has fault self-diagnosis and self-protection functions, which can be carried out regularly or irregularly with the monitoring software.

12). Strong anti-interference:For electromagnetic interference and radio frequency interference, the H series UPS is designed in accordance with the international standards EN50091-2 and IEC61000-4 series, which effectively improves the safety and reliability of UPS use.

13). Can be used with generators:With a wide input voltage and frequency range, it can be used with major brand generators to extend the use time. At the same time, it effectively removes the bad power generated by the generator and provides pure, safe and stable power for the load.

14). Monitoring software:In order to make the management of UPS more convenient and effective for users, the corresponding network version of monitoring software can be downloaded for free on the website to achieve intelligent management.

15). Original battery:The standard UPS is equipped with high-quality original batteries, with good battery quality to ensure the safety and reliability of UPS use. The battery selection of the long-term machine can be customized according to the needs of users.

16). High reliability:The pure online dual-change design isolates and filters various harmonics and faults of the power grid. At the same time, it integrates short circuit, overload, overheating, output undervoltage and other technologies to make the system operation more reliable and safer.

17). Automatic power on:When the mains power is cut off, the UPS will discharge in battery mode until it shuts down; when the mains power is restored, the UPS can automatically start up, facilitating power management in unattended situations.