摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power circuit by a primary battery 31 employing a solar battery, which can efficiently use the primary battery 31 with a relatively simple circuit configuration. <P>SOLUTION: A power supply device comprises: a solar battery; a capacitor 21 for storing the output of the solar battery; a first constant voltage circuit 41 using the output voltage of the capacitor 21 as a constant output voltage; a primary battery 31; and a second constant voltage circuit 42 using the output voltage of the primary battery 31 as a constant output voltage. The output voltage of the second constant voltage circuit 42 is set slightly lower than the output voltage of the first constant voltage circuit 41, and an output terminal of the first constant voltage circuit 41 and an output terminal of the second constant voltage circuit 42 are connected to an output terminal 45 of the power supply. <P>COPYRIGHT: (C)2012,JPO&INPIT |