| 摘要 |
<p>PROBLEM TO BE SOLVED: To avoid damages to switch elements of a signal switcher, and to shorten a time when control to the switch element is executed.SOLUTION: A switching control circuit comprises: a processing part 33 executing control of switch elements 21-23 of a signal switcher 4 and control of a power supply part 5, the signal switcher 4 being arranged between the power supply part 5 outputting a current I and a plurality of resistors 11a-11c, and the signal switcher 4 connecting one of the plurality of resistors with the power supply part 5 to supply a current I by on/off-control of the switch elements 21-23; and a detector 32 detecting the current I. The processing part 33, when executing the on/off control of the switch elements 21-23, makes the power supply part 5 start outputting of the current I at a second current value lower than a first current value, and then, performs on/off control of the switch elements 21-23, and when it is determined that transition of the switch elements 21-23 to an on state or an off state is completed on the basis of a current value Ia of the current I detected by the detector 32, makes the power supply part 5 prescribe the current value Ia to the first current value.</p> |
