| 摘要 |
PURPOSE:To obtain a magnetic flux control circuit incorporating the self-diagnosis function by causing the necessary output in case some fault occurs to either one of the signals of the phase control, the reset current control and the overcurrent detection each. CONSTITUTION:When the phase control signal is supplied to terminal 1 and the phase control is carried out normally after decision given to control signal 0 through decision circuit 21, set gate 18 is blocked. Then the reset signal is applied to terminal 3 to supply the necessary current to coil 10-A of magnetic core 9 via resetting exciter 8. When the reset current is normal, output Q' of FF6B is set to 1 to be applied to gate 16 of quality decision circuit 15. If the overcurrent occurs to the reset current, reset comparator 14 detects it. And then set gate 18 and reset gate 7 are blocked to avoid the buring of reset exciter 17 and exciter 8. Also gate 16 is turned off even if some fault takes place at either one of the phase control, the reset current control and the covercurrent detection. And the output of deciding FF6C turns to logic 0 to secure the decision for the quality of the magnetic flux control circuit. |
