UPS is an uninterruptible power supply with constant voltage and constant rating that contains energy storage devices and uses inverters as the main component. UPS has a power protection system with functions such as voltage stabilization, frequency stabilization, filtering, anti-electromagnetic and radio frequency interference, and anti-voltage surge.
When there is utility power for the UPS, the UPS will stabilize the utility power (220V ± 5%) before supplying power to the computer. The UPS at this time is an AC mains voltage stabilizer, and it also charges the internal battery. When the utility power is abnormal or interrupted, the UPS immediately supplies the power of the battery in the machine to the computer system through inverter conversion to maintain the normal operation of the computer system and protect the computer's software and hardware from loss.
Line interactive UPS for personal computer
UPS power supply can be divided into two major categories: backup type and online type according to its working mode. According to its output waveform, it can be divided into two types: square wave output and sine wave output. When the backup UPS power supply is normally supplied by the mains, the mains directly provides power to the load through the AC bypass channel and then through the transfer switch, and the inverter in the machine is in a stopped working state.
When the on-line UPS power supply is normally supplied by the mains, it first converts the mains AC power to a DC power, then performs pulse width modulation and filtering, and then converts the DC power to AC power again, that is, it is usually rectified from AC power. Provide AC power to the load by means of an inverter. Once the mains power is interrupted, the battery will provide AC power to the load in the inverter mode.
Therefore, for the online UPS power supply, under normal conditions, regardless of whether there is commercial power, it is always powered by the inverter of the UPS power supply to the load, thus avoiding all the voltage fluctuations and interference caused by the mains power grid. Impact. Obviously, the power supply quality of the on-line UPS power supply is significantly better than that of the backup UPS power supply, because it can achieve stable frequency and stable power supply to the load, and its conversion time is zero when the power supply is switched from the mains power to the battery power supply.