1. The main circuit, adjustment circuit, sine pulse width modulation circuit, and drive circuit form a dual closed-loop regulation system, which stabilizes the UPS output voltage and reduces output waveform distortion.

2. The main circuit is equipped with large filtering capacitors that can absorb various interference signals from the power grid, thereby improving the anti-interference performance of the UPS.

3. A charging circuit has been set up to charge the battery.

4. A comprehensive protection system has been established to provide reliable protection for power electronic modules and batteries.

5. A conversion switch is set up to convert the inverter output to mains power output in case of inverter failure.

When the power grid is supplying power normally, on the one hand, the power grid rectifies the main circuit first, then inverts it into a standard sine AC voltage, and outputs it through a conversion switch; At the same time, the power grid converts it into DC voltage through the charging circuit to charge the battery. When the power grid is interrupted, the battery is converted into a standard sine AC voltage through an inverter, which is then output through a conversion switch. When the inverter fails, the UPS bypasses the output through the transfer switch and stops the inverter from working.