| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a power supply apparatus comprising a reset signal generation means capable of surely resetting a microcomputer using a power source control signal. <P>SOLUTION: A power supply apparatus 20 comprises: a power source rectification circuit 4 which is started by a power switch 9; a power source control circuit 13 in which a power source control signal Spc from the outside is differentiated by an electrolytic capacitor C1 for differentiation, the power switch 9 is turned on by a trigger pulse P1 generated from an output of a transistor Q2 just for a predetermined time determined by a time constant circuit 11 to start the power source rectification circuit 4, the started state is maintained by supplying a voltage from the power source rectification circuit 4 to the power switch 9 after the start, and the power switch 9 is turned off when the power source control signal Spc is OFF; and a microcomputer reset signal generation means 12 for outputting, as a reset signal /RST, a pulse P2 generated from a power supply voltage VDD of the power source rectification circuit 4 just for a prescribed time determined by the time constant circuit 11 when the power source control signal Spc rises. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
