| 摘要 |
PURPOSE:To simplify the constitution of a change-over circuit by making a changeover between an in-use route and standby route using the whole power of the circuit for the supervision upon the in-use and standby routes. CONSTITUTION:When the whole power of the in-use route becomes below the prescribed volue, switch SW is operated by the output information of DET (whole- power detector) 1 to change the in-use route over to the standby route. If the whole power of the standby route is below the prescribed value too at this time, it is judged that the rotation is in an unused state and no changeover is therefore made. As a result, the needs of a pilot-signal generator and pilot-signal detecting filter are eliminated as compared with a conventional system using a pilot signal and the constitution of this circuit is simplified. |
