The EPS emergency power system primarily includes rectifier/charger, battery bank, inverter, transfer switch, and system controller, among other components. The inverter is the core, typically utilizing DSP or a single-chip CPU for SPWM modulation control of the inverter section to achieve a good AC waveform output. The rectifier/charger's function is to charge the battery bank in a timely manner when the utility power is normal. The inverter's role is to convert the stored DC power from the battery bank into AC power output when the utility power is not normal, supplying stable and continuous power to the load equipment. The transfer switch ensures a smooth transition between utility power and inverter output.