Abstract: The present invention relates to a converter for transferring power between a first DC system of DC voltage V1 and a second DC system of DC voltage V2, the converter comprising: —a first AC/DC converter for transforming DC voltage V1 into a first single phase AC voltage V1ac, of frequency ?, root mean square line-neutral magnitude V1acm and angle ?1; a second AC/DC converter for transforming DC voltage V2 into a second single phase AC voltage V2ac, of frequency ?, root mean square line-neutral magnitude V2acm and angle ?2; and two inductors L1, L2 and a capacitor C, wherein the first terminals of the inductors and capacitor are connected together, the second terminal of inductor L1 and the second terminal of the capacitor C are connected to the first AC voltage V1ac, and the second terminal of inductor L2 and the second terminal of the capacitor C are connected to the second AC voltage V2ac; wherein the value of the capacitor C, inductor L1 and inductor L2 are selected to enable required power transfer and to

Abstract: A hub for transferring power between DC systems. The hub comprises N modules, each for connection to a respective DC system of voltage Vidc and for exchanging power P1 with the respective DC system, and a common p-phase AC bus for connecting the N modules. Each module comprises a DC/AC converter for transforming the respective DC voltage Vidc into a respective p-phase AC voltage Viac of frequency ?s.

Abstract: The present invention relates to a converter for transferring power between a first DC system of DC voltage V1 and a second DC system of DC voltage V2, the converter comprising: —a first AC/DC converter for transforming DC voltage V1 into a first single phase AC voltage V1ac, of frequency ?, root mean square line-neutral magnitude V1acm and angle ?1; a second AC/DC converter for transforming DC voltage V2 into a second single phase AC voltage V2ac, of frequency ?, root mean square line-neutral magnitude V2acm and angle ?2; and two inductors L1, L2 and a capacitor C, wherein the first terminals of the inductors and capacitor are connected together, the second terminal of inductor L1 and the second terminal of the capacitor C are connected to the first AC voltage V1ac, and the second terminal of inductor L2 and the second terminal of the capacitor C are connected to the second AC voltage V2ac; wherein the value of the capacitor C, inductor L1 and inductor L2 are selected to enable required power transfer and to

Abstract: A DC-DC power converter circuit (20) is provided for transferring power between low voltage terminals and high voltage terminals. The circuit comprises an inductor (Lr) and a capacitor (Cr) provided across the low voltage terminals, the capacitor being provided in parallel with the high voltage terminals. The circuit further comprises a plurality of switches (T1 to T4) for switching the polarity of the capacitor in the circuit, and a controller for controlling the switching of the capacitor to repeatedly switch the polarity of the capacitor at a switching frequency f, such that, in use, and other than at the instant of switching, the switched capacitor produces an increasing voltage at the high voltage side of the inductor. A connection device (D2) is provided for repeatedly connecting the high voltage terminals to the switched capacitor at substantially the switching frequency f to enable current flow between the switched capacitor and the high voltage terminals.

Abstract: A DC-DC power converter (130) for transferring power between low voltage terminals (26) and high voltage terminals (28). The converter comprises a low voltage circuit (132) connectable to the low voltage terminals (26), a high voltage circuit (134) connectable to the high voltage terminals (28); and at least one capacitor (Cr) common to the low and high voltage circuits. Each of the circuits comprises an inductor (L1/L2) and switches (T1-T4/T5-T6) arranged to connect the capacitor(s) in series with the respective inductor, with alternating polarity, to form a resonant LC connection across the respective voltage terminals. The switches in each circuit include at least one set of switches (T1,T2/T5,T6) which, when actuated, allow current flow at the respective voltage terminals in a first direction; and the switches in at least one of the circuits include a further set of switches (T3, T4/T7,T8), which, when actuated, allow current flow at the respective voltage terminals in a second direction.