| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a power supply apparatus in which a difference between a voltage of the power supply source during a normal state and the output voltage of the DC-DC converter during a temporary voltage variation of the power supply source is always small. <P>SOLUTION: A power supply apparatus 20 has a sample hold circuit 28 that, in response to a sample timing signal, samples a voltage supplied from a power supply source 22 to a load 21 and that holds it as an output set value of a DC-DC converter 24. By supplying electric power to a load 21 with the output of the DC-DC converter 24, which is so controlled as to exhibit the output set value when the voltage of the power supply source 22 decreases, the power supply source 22 uses a voltage equivalent before decreasing as the output set value of the DC-DC converter 24. Thus, a difference of an output voltage of the power supply apparatus 20 between the time of a normal state and the time of a voltage drop becomes always small and the stable operation of the load 21 can be continued. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
