A power converter (19a, 20a) comprising: a plurality of bypass capacitors (C11,C11b,C21,C21b); and two or more switch blocks each having: a plurality of switch-pairs, each having two switches connected in series to each other; a plurality of primary nodes (NA2, NA4, NA6, NB2, NB4, NB6), each interconnecting the switches in a respective switch-pair; a plurality of secondary nodes (NA 1, NA 3, NA 5, NA 7, NB 1, NB 3, NB 5, NB 7) each switch-pair being connected in series to an adjacent switch-pair through a said secondary node to form a serial chain of switch-pairs, the secondary nodes including a secondary node at one end of said serial chain and a secondary node at another end of said serial chain; and at least one flying capacitor (C f1, C f1b' C f2,C f2b); wherein within each switch block: each pair of adjacent primary nodes is connected to a flying capacitor; in case the switch block comprises more than two switch-pairs, the flying capacitors are connected in series; a secondary node at one end of said serial chain of switch-pairs is connected to a low-voltage terminal; and each pair of adjacent secondary nodes is connected to one or more of the following: one or more bypass capacitors, one or more other switch blocks, and the low-voltage terminal; wherein the low-voltage terminal is formed by two adjacent secondary nodes in a first of the switch blocks; all bypass capacitors are connected in series, and one switch block of the two or more switch blocks is configured to allow for a conversion ratio of m by means of m switch-pairs, and another switch block of the two or more switch blocks is configured to allow for a conversion ratio of n by means of n switch-pairs, with m and n integers and 1 < m < n, and the power converter is configured to convert a first voltage at the low voltage terminal to a second voltage at a high-voltage terminal, and is configured to convert a first voltage at the high voltage terminal to a second voltage at the low-voltage terminal, and wherein the high-voltage terminal is formed by said secondary node at one end of the serial chain of switch-pairs of said first switch block that is connected to the low-voltage terminal, and the secondary node at the end of the serial chain of switch-pairs of said last switch block that is not connected to a low-voltage terminal. a plurality of bypass capacitors (C11,C11b,C21,C21b); and two or more switch blocks each having: a plurality of switch-pairs, each having two switches connected in series to each other; a plurality of primary nodes (NA2, NA4, NA6, NB2, NB4, NB6), each interconnecting the switches in a respective switch-pair; a plurality of secondary nodes (NA 1, NA 3, NA 5, NA 7, NB 1, NB 3, NB 5, NB 7) each switch-pair being connected in series to an adjacent switch-pair through a said secondary node to form a serial chain of switch-pairs, the secondary nodes including a secondary node at one end of said serial chain and a secondary node at another end of said serial chain; and a plurality of switch-pairs, each having two switches connected in series to each other; a plurality of primary nodes (NA2, NA4, NA6, NB2, NB4, NB6), each interconnecting the switches in a respective switch-pair; a plurality of secondary nodes (NA 1, NA 3, NA 5, NA 7, NB 1, NB 3, NB 5, NB 7) each switch-pair being connected in series to an adjacent switch-pair through a said secondary node to form a serial chain of switch-pairs, the secondary nodes including a secondary node at one end of said serial chain and a secondary node at another end of said serial chain; and at least one flying capacitor (C f1, C f1b' C f2,C f2b); wherein within each switch block: each pair of adjacent primary nodes is connected to a flying capacitor; in case the switch block comprises more than two switch-pairs, the flying capacitors are connected in series; a secondary node at one end of said serial chain of switch-pairs is connected to a low-voltage terminal; and each pair of adjacent secondary nodes is connected to one or more of the following: one or more bypass capacitors, one or more other switch blocks, and the low-voltage terminal; wherein the low-voltage terminal is formed by two adjacent secondary nodes in a first of the switch blocks; one or more bypass capacitors, one or more other switch blocks, and the low-voltage terminal; wherein the low-voltage terminal is formed by two adjacent secondary nodes in a first of the switch blocks; all bypass capacitors are connected in series, and one switch block of the two or more switch blocks is configured to allow for a conversion ratio of m by means of m switch-pairs, and another switch block of the two or more switch blocks is configured to allow for a conversion ratio of n by means of n switch-pairs, with m and n integers and 1 < m < n, and the power converter is configured to convert a first voltage at the low voltage terminal to a second voltage at a high-voltage terminal, and is configured to convert a first voltage at the high voltage terminal to a second voltage at the low-voltage terminal, and wherein the high-voltage terminal is formed by said secondary node at one end of the serial chain of switch-pairs of said first switch block that is connected to the low-voltage terminal, and the secondary node at the end of the serial chain of switch-pairs of said last switch block that is not connected to a low-voltage terminal.