How Uninterruptible Power Supply Works

How Uninterruptible Power Supply(UPS) Works

The backup type is also called the Off-Line UPS. It is only a "backup" UPS. The AC power directly supplies power to the electrical equipment and charges the battery (Normal Mode). Once the AC power supply quality is unstable or there is a power outage, the AC circuit will be automatically cut off, and the DC power of the battery will be converted into AC power to take over the power supply task (Battery Mode) until the AC power returns to normal. "UPS will only intervene in the power supply when the AC power is out." However, the AC power converted from DC is a square wave, which is limited to supplying power to capacitive loads, such as computers and monitors. If the Inverter is a sine wave inverter, it can supply power to inductive loads, such as motors and electric fans.

Online interleaving

Online interleaving is also called online interactive or line interactive UPS. The basic operation mode is the same as offline. The difference is that although online interleaving does not intervene in the power supply of the mains like online, it monitors the power supply status of the mains at any time. It has its own boost and pressure reduction compensation circuit. When the power supply status of the mains is not ideal, it will be corrected immediately to reduce unnecessary "Battery Mode" switching and extend battery life.

Online
The operation mode of the online uninterruptible power supply system (On-Line UPS) is "the mains and the power-consuming equipment are isolated, and the mains will not directly supply power to the power-consuming equipment". Instead, it is converted into DC power when it reaches the UPS, and then divided into two ways, one for charging the battery and the other for AC power to supply power to the power-consuming equipment. When the mains power supply quality is unstable or there is a power outage, the battery switches from charging to power supply until the mains power returns to normal. "UPS is fully involved in the entire process of power consumption." Its advantage is that the output waveform is a sinusoidal wave like the AC power, and it is pure and noise-free. It is not affected by the instability of the AC power and can supply power to "inductive loads", such as electric fans. As long as the UPS output power is sufficient, it can supply power to any device that uses AC power.