| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply device capable of improving the whole efficiency in charging and discharging of electric storage.SOLUTION: The power device includes a DC-DC converter 23 connected to a generator 11 and a main power supply 17; an electrical storage 29 connected to the other end and an output voltage detector 31 connected to the generator 11. The power device, further, consists of a charging-state detecting means (a current detector 34) connected to the main power supply 17, and a control circuit 35 connected to the DC-DC converter 23, the output voltage detector 31 and the charging-state detecting means. When the generator 11 generates regenerative power, the control circuit 35 controls the DC-DC converter 23, in such a way that when a charging state SOC is small, an output voltage Vd is raised; and when the charging state SOC is large it is lowered within a range from a lower control voltage Vdk lower by a first specified voltage width ΔV1 than a first specified output voltage Vdc1 to an upper control voltage Vdu which is higher by a second specified voltage width ΔV2 than a second specified output voltage Vdc2. |
