| 摘要 |
A DC to DC converter (14) includes a first transistor (32) having a first power terminal connected to one side (28) of a DC power supply (10) and a second power terminal connected to one end of an inductor (38). A second transistor (40) has a first power terminal connected to the other end of the inductor and a second power terminal connected to the other side (30) of the DC power supply. A pair of capacitors (60, 62) is connected in series and defined therebetween a node (64) which is connected to a ground potential (46). A third transistor (50) has a first power terminal connected to the one end of the inductor and a second power terminal connected to one end of the pair of capacitors. A fourth transistor (58) has a first power terminal connected to the other end of the pair of capacitors and a second power terminal connected to the other end of the inductor. Each transistor includes a diode (66, 68, 70, 72) connected between the first power terminal and the second power terminal thereof. Each diode is oriented to conduct current in a direction opposite its corresponding transistor. A controller (18) is connected to a control terminal of each transistor for controlling the switching thereof. The DC to DC converter can be operated to increase or decrease a DC voltage between the DC power supply and the pair of capacitors connected in series. Connecting the ground potential to the node between the pair of capacitors avoids generating large potential differences between the DC power supply and the pair of capacitors.
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