An apparatus, system, and method for are provided. A device includes a first tunable replica circuit configured to detect an undervoltage and overclocking event, a second tunable replica circuit configured to detect an overvoltage and underclocking event, and a countermeasures component configured to alter a circuit of the device responsive to detection of the undervoltage and overclocking event or the overvoltage and underclocking event.

An electronic system for a surgical instrument is disclosed. The electronic system comprises a main power supply circuit configured to supply electrical power to a primary circuit. A supplementary power supply circuit configured to supply electrical power to a secondary circuit. A short circuit protection circuit coupled between the main power supply circuit and the supplementary power supply circuit. The supplementary power supply circuit is configured to isolate itself from the main power supply circuit when the supplementary power supply circuit detects a short circuit condition at the secondary circuit. The supplementary power supply circuit is configured to rejoin the main power supply circuit and supply power to the secondary circuit, when the short circuit condition is remedied.

A powered surgical instrument including an end effector, which includes jaws that are configured to transition between various closure states. The surgical instrument includes a sensor configured to measure the closure state of the jaws and a display configured to display information indicative to the detected closure state. The surgical instrument further includes a firing member movable between a first position and a second position to transition the end effector between the plurality of closure states and a motor configured to drive the firing member between the first position and the second position.

A fire detection system may include isolation circuit having an isolation switch coupled with a system line of the fire detection system and configured to isolate a first side of the system line from a second side of the system line. The isolation circuit may also include a controller coupled with the isolation switch. The controller may be configured to detect repetitive, intermittent short circuit activity on the system line and control the isolation switch based on this activity.

A fire detection system may include isolation circuit having an isolation switch coupled with a system line of the fire detection system and configured to isolate a first side of the system line from a second side of the system line. The isolation circuit may also include a controller coupled with the isolation switch. The controller may be configured to detect repetitive, intermittent short circuit activity on the system line and control the isolation switch based on this activity.

A method for analyzing power quality events in an electrical system includes processing electrical measurement data from or derived from energy-related signals captured by at least one of a plurality of metering devices in the electrical system to generate or update a plurality of dynamic tolerance curves. Each of the plurality of dynamic tolerance curves characterizes a response characteristic of the electrical system at a respective metering point of a plurality of metering points in the electrical system. Power quality data from the plurality of dynamic tolerance curves is selectively aggregated to analyze power quality events in the electrical system.

A method for analyzing power quality events in an electrical system includes processing electrical measurement data from or derived from energy-related signals captured by at least one of a plurality of metering devices in the electrical system to generate or update a plurality of dynamic tolerance curves. Each of the plurality of dynamic tolerance curves characterizes a response characteristic of the electrical system at a respective metering point of a plurality of metering points in the electrical system. Power quality data from the plurality of dynamic tolerance curves is selectively aggregated to analyze power quality events in the electrical system.

A smart circuit breaker includes a communication interface, separable contacts, a processing unit having a memory with a routine stored therein which, when executed by the processing unit causes the processing unit to: sense a power outage in an electrical grid, control a meter to open contacts to disconnect from the electrical grid, sense power restoration to the electrical grid, control contacts corresponding to a secondary power source to open, control the meter to close contacts to reconnect to the electrical grid, sense that a frequency of power from the electrical grid matches a frequency of power from the secondary power source, and control the contacts corresponding to the secondary power source to close.

An end effector for use with a surgical stapling instrument is disclosed. The end effector comprises a first jaw, a second jaw movable relative to the first jaw to grasp tissue therebetween, and a staple cartridge. The staple cartridge comprises staples deployable into the tissue. The end effector further comprises a magnetic sensor configured to measure a parameter indicative of an identifying characteristic of the staple cartridge, an impedance sensor configured to measure a parameter indicative of an impedance of the tissue, and a processing unit in communication with the impedance sensor. The processing unit is configured to determine a property of the tissue based on an output of the impedance sensor.

One example discloses a power management circuit, including: a voltage reference circuit including a bandgap circuit coupled to and configured by a first trimming circuit; an undervoltage lockout (UVLO) circuit coupled to and configured by a second trimming circuit; wherein the first trimming circuit and the second trimming circuit are configured to receive a single trim control setting.