| 摘要 |
PROBLEM TO BE SOLVED: To attain reduction in component cost and product cost by attaining a simple circuit structure corresponding to characteristics of a solar battery, when the solar battery is used as a charging power supply to charge a capacitor storage power supply. SOLUTION: The charging device for the capacitor storage power supply includes a constant current signal generating means 1 which generates an error amplified signal for limiting a charging current I when the charging current I of the capacitor storage power supply 7 is compared with a current reference value Vrefi and the charging current becomes the current reference value or higher, and with an input constant voltage signal generating means 2 which generates the error amplified signal for limiting the charging current I when the input voltage Vi from the charging power supply 5 is compared with an input voltage reference value Vrefvi and the input voltage becomes the input voltage reference value or lower. Each error amplified signal is supplied to a pulse width modulation means 4 through OR circuits D1, D2 to effect pulse width modulation relative to the capacitor storage power supply 7 from the charging power supply 5 to control the charging current I to conduct charging. COPYRIGHT: (C)2007,JPO&INPIT |
