Fuse and breaker alarm device and method using a finite state machine

摘要

An alarm circuit and method of monitoring a circuit protection device are disclosed. The alarm circuit includes a circuit protection device connected in series at an input voltage of a load. The alarm circuit also includes a programmable circuit connected in parallel to the circuit protection device and including an alarm signal. The programmable circuit is programmed to include a plurality of functional states, and at least one functional state corresponds to activation of the alarm signal. The at least one functional state activating the alarm signal corresponds with an interruption condition in the circuit protection device.

主权项

1. An alarm circuit comprising:
a circuit protection device connected in series at an input voltage of a load; a programmable circuit connected in parallel to the circuit protection device and including an alarm signal, the programmable circuit programmed to include a functional state machine comprising a plurality of functional states including:
a startup state;a normal circuit operation state; andan alarm activation state corresponding to a circuit interrupt condition in the circuit protection device; an LED indicator electrically connected to the programmable circuit, the LED indicator configured to emit a first visual indication when the programmable circuit is in the normal circuit operation state and a second visual indication different from the first visual indication when the programmable circuit is in the alarm activation state; wherein the functional state machine is operable in an unclocked configuration in which changes among the plurality of functional states are based at least in part on changes to values of inputs to the programmable circuit.