An apparatus for electric power conversion, said apparatus comprising a converter having a first terminal and a second terminal, said converter comprising a regulating circuit (16A, 16B, 16C, 300A), said regulating circuit (16A,16B,16C,300A) including an inductance, and switching elements (3,4,5) connected to said inductance, said switching elements (3,4,5) being controllable to switch between switch configurations, wherein, said regulating circuit (16A,16B,16C,300A) maintains an average DC current through said inductance, and a multi-phase switching network (12A, 12B, 200) having an input port and an output port, said switching network (12A, 12B, 200) including charge storage elements and switching elements connected to said charge storage elements, said switching elements being controllable to switch between switch configurations, wherein, in one switch configuration, said switching elements form a first arrangement of charge storage elements in which a charge storage element is charged through one of the input port and the output port of the switching network, and wherein, in another configuration, said switching elements form a second arrangement of charge storage elements in which a charge storage element is discharged through one of said input port and output port of said switching network(12A, 12B, 200), and wherein at least one of two cases apply: said regulating circuit (16A,16B,16C,300A) is connected between said second terminal of said converter and said switching network(12A, 12B, 200), said switching network (12A, 12B, 200)being an adiabatically charged switching network(12A, 12B, 200); and said regulating circuit (16A,16B,16C,300A) is connected between said first terminal of said converter and an input port of said switching network(12A, 12B, 200), said switching network (12A, 12B, 200)being an adiabatically charged switching network(12A, 12B, 200). a regulating circuit (16A, 16B, 16C, 300A), said regulating circuit (16A,16B,16C,300A) including an inductance, and switching elements (3,4,5) connected to said inductance, said switching elements (3,4,5) being controllable to switch between switch configurations, wherein, said regulating circuit (16A,16B,16C,300A) maintains an average DC current through said inductance, and a multi-phase switching network (12A, 12B, 200) having an input port and an output port, said switching network (12A, 12B, 200) including charge storage elements and switching elements connected to said charge storage elements, said switching elements being controllable to switch between switch configurations, wherein, in one switch configuration, said switching elements form a first arrangement of charge storage elements in which a charge storage element is charged through one of the input port and the output port of the switching network, and wherein, in another configuration, said switching elements form a second arrangement of charge storage elements in which a charge storage element is discharged through one of said input port and output port of said switching network(12A, 12B, 200), and wherein at least one of two cases apply: said regulating circuit (16A,16B,16C,300A) is connected between said second terminal of said converter and said switching network(12A, 12B, 200), said switching network (12A, 12B, 200)being an adiabatically charged switching network(12A, 12B, 200); and said regulating circuit (16A,16B,16C,300A) is connected between said first terminal of said converter and an input port of said switching network(12A, 12B, 200), said switching network (12A, 12B, 200)being an adiabatically charged switching network(12A, 12B, 200). wherein, in one switch configuration, said switching elements form a first arrangement of charge storage elements in which a charge storage element is charged through one of the input port and the output port of the switching network, and wherein, in another configuration, said switching elements form a second arrangement of charge storage elements in which a charge storage element is discharged through one of said input port and output port of said switching network(12A, 12B, 200), and wherein at least one of two cases apply: said regulating circuit (16A,16B,16C,300A) is connected between said second terminal of said converter and said switching network(12A, 12B, 200), said switching network (12A, 12B, 200)being an adiabatically charged switching network(12A, 12B, 200); and said regulating circuit (16A,16B,16C,300A) is connected between said first terminal of said converter and an input port of said switching network(12A, 12B, 200), said switching network (12A, 12B, 200)being an adiabatically charged switching network(12A, 12B, 200). said regulating circuit (16A,16B,16C,300A) is connected between said second terminal of said converter and said switching network(12A, 12B, 200), said switching network (12A, 12B, 200)being an adiabatically charged switching network(12A, 12B, 200); and said regulating circuit (16A,16B,16C,300A) is connected between said first terminal of said converter and an input port of said switching network(12A, 12B, 200), said switching network (12A, 12B, 200)being an adiabatically charged switching network(12A, 12B, 200).