LOAD CONTROL DEVICE HAVING STUCK RELAY DETECTION

摘要

A load control device (e.g., a switching device) for controlling power delivered from an AC power source to an electrical device (e.g., a lighting load) may be configured to detect that a relay is stuck closed and attempt to fix the relay. The relay of the load control device may be adapted to be coupled between the source and the electrical device to control the power delivered to the electrical device so as to generate a switched-hot voltage. The load control device may comprise a detect circuit configured to generate a detect signal indicating a magnitude of the switched-hot voltage, and a control circuit configured to monitor the detect signal. The control circuit may be configured to determine that the relay is stuck closed in response to the detect signal, and to control the relay in order to attempt to fix the relay by repeatedly closing and opening the relay.

主权项

1. A load control device for controlling power delivered from an AC power source to an electrical device, the load control device comprising:
a first electrical connection adapted to be electrically coupled to the AC power source; a second electrical connection adapted to be electrically coupled to the electrical device; a relay electrically coupled between the first and second electrical connections and configured to control the power delivered from the AC power source to the electrical device so as to generate a switched-hot voltage at the second electrical connection; a detect circuit electrically coupled to the second electrical connection and configured to generate a detect signal indicating a magnitude of the switched-hot voltage; a control circuit configured to generate a drive signal for attempting to open and close the relay, configured to monitor the detect signal, and configured to determine whether the relay is open or closed based on the detect signal;wherein the control circuit is further configured to perform a stuck closed procedure in response to determining that the relay is stuck closed, the stuck closed procedure comprising the control circuit attempting to close the relay, attempting to open the relay, monitoring the detect signal, and determining whether the relay is stuck closed.