| 摘要 |
PROBLEM TO BE SOLVED: To prevent a relay from being turned off when a voltage of a coil is reduced.SOLUTION: A relay switch 103 has a coil 201 whose one end is applied with a predetermined voltage and whose the other end is grounded via a resistor 104, and is turned on to supply a power to electronic equipment in the case that a voltage of the coil 201 is equal to or more than a predetermined value. A transistor 106, at power supply start, pulls a current flowing in the coil 201 in and flows it to the ground not via the resistor 104 to make the voltage of the coil 201 be a predetermined value or more, and after the power supply start, gradually reduces a pull-in amount of the current flowing in the coil 201 to reduce the voltage of the coil 201 so as not to be less than the predetermined value. |
