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US 12,565,401 B2Granted
Elevator switch monitoring device
AssigneeOtis Elevator Company
InventorsBen Guo, Zhenhong Li
Life of this patent
Estimating the term…
Abstract
An illustrative example embodiment of a switch monitoring device includes a controller configured to command a switch to enter at least one of a conducting state and a non-conducting state. A monitoring circuit conducts current when the switch is in the conducting state. A comparator provides an output indicating a relationship between a voltage of a selected portion of the monitoring circuit and a threshold voltage. The controller determines a condition of the switch based on the output of the comparator and the command.
Claims22
A switch monitoring device, comprising:
- a controller configured to issue a command for a switch to enter at least one of a conducting state and a non-conducting state;
- a monitoring circuit configured to conduct current when the switch is in the conducting state;
- and
- a comparator configured to provide an output indicating a relationship between a voltage of a selected portion of the monitoring circuit and a threshold voltage;
- wherein the controller determines a condition of the switch based on the output of the comparator and the command.
2 more elements
A method of monitoring a switch, the method comprising:
- using a controller to issue a command for the switch to enter at least one of a conducting state and a non-conducting state;
- conducting current through a monitoring circuit when the switch is in the conducting state;
- determining a relationship between a voltage of a selected portion of the monitoring circuit and a threshold voltage;
- and
- using the controller to determine a condition of the switch based on a determined relationship and the command.
2 more elements
Dependencies are inferred from the claim text.