ORGANISATION FOR THE CONTROL OF A BODY CONCLUDED IN A TRANSFER SECONDARY

摘要

PCT No. PCT/DE96/01297 Sec. 371 Date Jun. 23, 1998 Sec. 102(e) Date Jun. 23, 1998 PCT Filed Jul. 17, 1996 PCT Pub. No. WO97/15834 PCT Pub. Date May 1, 1997A synchronous rectifier, to which the primary-side input voltage of the transformer and a control voltage with the same frequency as the input voltage is applied, is connected to the primary side of the transformer. The phase of the control voltage can be switched between 0 DEG and 90 DEG , so that the output voltage of the synchronous rectifier corresponds exclusively to the voltage drop component at the ohmic input resistance of the transformer at 0 DEG , and exclusively to the voltage drop component at the inductive input resistance of the transformer at 90 DEG . Since both the ohmic and the inductive input resistances are dependent on the resistance of the load connected to the secondary side (e.g., the squib of an air bag), both voltage components can be used to obtain reliable information on the status of the load resistance.