| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem that it is always needed to delay a fixed time period t (e.g., 0.3 second) until a power supply circuit actually starts after a power switch is turned on to cope with chattering in starting power supply. <P>SOLUTION: Mounting a battery 1 supplies voltage to a power supply circuit 6, and a voltage detection circuit 2 generates a mounting signal of the battery 1. The circuit 2 detects a voltage, and a switch 4 inputs a power-on signal to power on a portable electronic device and a power-off signal to power off the device to a control circuit 3. By receiving the power-off signal, a delay circuit 5 stops a P. ON. Hi_3 signal to control the power supply circuit 6 for a prescribed time period, a storage circuit 7 stores the power-on signal or the mounting signal, and the delay circuit 5 inputs the P. ON. Hi_3 signal to the power supply circuit 6 after making a delay for a prescribed time period to apply the voltage from the battery 1 to the power supply circuit 6. <P>COPYRIGHT: (C)2008,JPO&INPIT |
