Uninterruptible Power Supply Converter Circuit

An uninterruptible power supply (UPS) converter circuit includes a controlled switching element, a filter capacitor, and a split DC capacitor comprising a plus DC capacitor and a minus DC capacitor split at a DC-link mid-point, connected to each other at the DC-link mid-point on a respective first side. A second side of the input filter capacitor at an AC point is coupled via an inductor element to a second side of the controlled switching element, the second side of the controlled switching element being coupled to the second side of the plus DC capacitor and the minus capacitor. The controlled switching element operates is configured to be controlled such that a current from the AC point via the inductor element flows alternatingly to either the plus DC output capacitor or the minus DC capacitor, and to the DC-link mid-point, respectively, thereby discharging the input filter capacitor.