| 摘要 |
This invention relates to protection against reverse current flow in an output module for an Industrial Process Control System. The invention provides an apparatus for blocking reverse current comprising: a transistor driven by a control signal; a current monitor arranged to monitor a current through the transistor; and a processor arranged to receive the monitored current; and which is arranged in operation to generate the control signal in dependence upon said monitored current; and to turn off the transistor in the event that a reverse current is detected in the transistor. The technique may be extended to provide a power feed combiner with protection against reverse current flow. |
