DRIVING SYSTEM OF SWITCH MATRIX

摘要

PURPOSE:To prevent the generation a serious fault without increasing cost by making use of an extra contact for a bus selection relay. CONSTITUTION:A bus selection relay contact psr is inserted to the driving lines XR and YR of the return side of driving coil parts SWO-SWn. This contact psr prevents a shunt current. It is supported that a bus selection relay contact psrO of a driving line X7 at the coil part SWO has a stick fault. Under such conditions, the shunt route of the contact psrO has no fault since the contact psrO is opened after the level of the line X7 of the coil part SWn is driven. Therefore the driving current flows only to the designated driving route 1 to drive normally.