| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a switching power supply device wherein commonality of an input terminal and an output terminal for alternating-current voltage can be achieved. <P>SOLUTION: A switching circuit 11 is provided between a winding 21 of a transformer 2 and a main battery 10. A switching circuit 41 is provided between a winding 22 of the transformer 2 and input/output terminals T5, T6. A switching circuit 42 is provided between the switching circuit 41 and the input/output terminals T5, T6. The switching circuits 11, 41, 42 are so constructed that each of them includes a bidirectional switch (constructed of a pair of one switching element and one diode connected in parallel with each other). As a result, it is possible to achieve commonality of a circuit for outputting alternating-current output voltage Vacout and a circuit for inputting alternating-current input voltage Vacin to charge the main battery 10. <P>COPYRIGHT: (C)2008,JPO&INPIT |
