A power converter comprising: an AC power input having a phase input connection and a neutral input connection, the AC power input being configured to receive an AC input voltage; a backup power input (VBatt) configured to receive a backup voltage from a backup power source; a first capacitive element configured to store a positive DC output voltage with respect to the neutral input connection; a second capacitive element configured to store a negative DC output voltage with respect to the neutral input connection; and a power converter circuit having a first inductive element and a second inductive element the power converter circuit being coupled to the AC power input, the backup power input, the first capacitive element and the second capacitive element, the power converter circuit being configured to: in a line mode of operation and during a positive portion of the AC input voltage, convert the AC input voltage into the positive DC output voltage through the first inductive element and provide a charging voltage to the backup power source through the second inductive element using the negative DC output voltage stored in the second capacitive element; and in the line mode of operation and during a negative portion of the AC input, convert the AC input voltage into the negative DC output voltage through the second inductive element and provide the charging voltage to the backup power source through the first inductive element using the positive DC output voltage stored in the first capacitive element. an AC power input having a phase input connection and a neutral input connection, the AC power input being configured to receive an AC input voltage; a backup power input (VBatt) configured to receive a backup voltage from a backup power source; a first capacitive element configured to store a positive DC output voltage with respect to the neutral input connection; a second capacitive element configured to store a negative DC output voltage with respect to the neutral input connection; and a power converter circuit having a first inductive element and a second inductive element the power converter circuit being coupled to the AC power input, the backup power input, the first capacitive element and the second capacitive element, the power converter circuit being configured to: in a line mode of operation and during a positive portion of the AC input voltage, convert the AC input voltage into the positive DC output voltage through the first inductive element and provide a charging voltage to the backup power source through the second inductive element using the negative DC output voltage stored in the second capacitive element; and in the line mode of operation and during a negative portion of the AC input, convert the AC input voltage into the negative DC output voltage through the second inductive element and provide the charging voltage to the backup power source through the first inductive element using the positive DC output voltage stored in the first capacitive element. in a line mode of operation and during a positive portion of the AC input voltage, convert the AC input voltage into the positive DC output voltage through the first inductive element and provide a charging voltage to the backup power source through the second inductive element using the negative DC output voltage stored in the second capacitive element; and in the line mode of operation and during a negative portion of the AC input, convert the AC input voltage into the negative DC output voltage through the second inductive element and provide the charging voltage to the backup power source through the first inductive element using the positive DC output voltage stored in the first capacitive element.