Automated operation of silicon controlled rectifier switches using sensors such as Schmitt devices

Abstract

Circuits for automated operation, including automated reset, of switches are disclosed. Preferred embodiments of the switches of the invention include silicon controlled rectifier switches. The silicon controlled rectifier switches are automatically reset, while, in one embodiment, maintaining activation of a target system to which they are connected. The automated reset is effected using an alternate current path, connected to the current path between the target node and the system, upon sensing an event. The alternate current path draws current away from the common node, thereby resetting the switch while maintaining the current path through the target system to maintain the activation thereof. Upon a subsequent event, the alternate current path is removed, thereby deactivating the target system. The alternate current path can be effected using sensors, such as Optoschmitt sensors. Other embodiments include resetting the switch by independently deactivating the target system. Related circuits, including liquid tank flush/refill applications, are also disclosed.

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