The EA890 series high-power UPS is designed for China's power grid environment and premium electrical applications, developed with cutting-edge digital technology as the next generation of pure online smart UPS. The system features an online double conversion topology design, which completely eliminates power grid interference. The rectifier employs a three-level PWM rectification technique 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 robust shock resistance for the UPS output.