| 摘要 |
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. The converter also comprises selecting means (72,74) for selecting one of the sets of switches in the or each circuit where two sets are provided, to select the direction of current at the respective voltage terminals, and thereby control the direction of power transfer between the low and high voltage terminals. The converter also comprises control means (140, 142 and 140, 144) for actuating the (selected) set of switches in both circuits, to repeatedly connect the capacitor(s) to the respective inductors, to thereby allow power transfer between the low voltage terminals and the capacitor, and between the capacitor and the high voltage terminals.
|
