| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power supply device that efficiently feeds electric power from a power supply device to a load device. <P>SOLUTION: A power supply device comprises: a first converter circuit 43; a photovoltaic power generator 21 as a power source device 2; secondary batteries 31, 32; a second converter circuit 47; and a direct power feeding circuit 50. The first converter circuit 43 converts a voltage of the photovoltaic power generator 21 into a voltage of the stationary secondary battery 31 and supplies the voltage to a first DC bus line 41. The secondary battery 31 is charged from the first DC bus line 41. The second converter circuit 47 converts the voltage of the first DC bus line 41 into a voltage of the second battery 32 for a vehicle as a load device 3 and supplies the voltage to the secondary battery 32. The first converter circuit 43 can convert a voltage of the photovoltaic power generator 21 into a voltage of the secondary battery 32 and supply the voltage to a second DC bus line 42. In this case, power supplied from the secondary batter 31 is shut off with a diode D2 by closing a relay 51. The power of the first converter circuit 43 is directly supplied to the secondary battery 32 via the direct power feeding circuit 50 without through the second converter circuit 47, so that the secondary battery 32 is efficiently charged. <P>COPYRIGHT: (C)2012,JPO&INPIT |
