The EA890 series high-power UPS is designed for the Chinese power grid environment and high-end power consumption scenarios. It is a new generation of pure online smart UPS developed with cutting-edge digital technology. The system employs an online double conversion topology design, completely eliminating power grid interference. The rectifier uses a three-level PWM rectification technology based on IGBT devices, achieving superior performance with high input power factor and low input current harmonics. The inverter utilizes pulse width modulation technology based on IGBT devices and is equipped with an output isolation transformer, ensuring stable frequency and voltage, low waveform distortion, strong load-bearing capacity, and strong shock resistance for the UPS output.