What portion of the AC input power does a Double Conversion On-Line UPS convert to DC?

In a Double Conversion On-Line Uninterruptible Power Supply (UPS) configuration, the entire AC input power is converted to DC. This process occurs in two main steps: first, the AC input power is rectified into DC, and then it is inverted back to AC to provide a smooth and stable output. This architecture ensures that the connected load receives a consistent voltage and frequency, regardless of any fluctuations or interruptions in the input power supply.

By converting all of the input power to DC, the Double Conversion system allows for continuous and clean power delivery. This is particularly important in environments where power quality is crucial, as it protects sensitive equipment from disturbances.

The other options do not accurately reflect the operating principle of a Double Conversion On-Line UPS. For instance, stating that only half or one-third of the input power is converted does not align with the design objectives of this UPS type, which aims to utilize the full power input for conversion to DC in order to ensure optimal performance and reliability. The choice indicating no input power is also incorrect, as the UPS relies on the AC input to function effectively.