Control Signal Protection Device

摘要

A control signal protection device protects a current-receiving field device from an undesirable interruption in a control signal provided to the field device. The control signal protection device includes a first terminal to connect the signal protection device to a control system and a second terminal that connects the control signal protection device to a field device. The control signal device further includes a power storing element for temporary accumulation of electric energy and a switching circuit for controlling operational mode of the signal protection device. Electric energy is stored in the power storing element in a first operational mode. Electric energy stored in the power storing element is supplied to a positive terminal in the second terminal pair in a second operational mode.

主权项

1. A control signal protection device having a first operational mode and a second operational mode, comprising:
a first terminal to connect the signal protection device to a control system, wherein the control system provides a control signal; a second terminal to connect the signal protection device to a field device for providing the control signal to the field device; a power storing element for temporary accumulation of electric energy; and a switching circuit coupled to the first terminal, the second terminal, and the power storing element, the switching circuit configured to control operational mode of the signal protection device in response to variation in current level at the second terminal of the control signal protection device, wherein
electric energy is accumulated in the power storing element in the first operation mode, andelectric energy accumulated in the power storing element in the first operation mode is transferred to the second terminal in the second operational mode.