# US 12,179,931 B2 · External power safety alert for a vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,179,931 B2 - Document ID: US12179931B2 - Status: Granted - Kind: B2 - Application number: 17/689,596 - Filed: 2022-03-08 - Published: 2023-09-14 - Granted: 2024-12-31 - Earliest claimed: 2022-03-08 - Assignees: Lockheed Martin Corporation - Applicants: Lockheed Martin Corporation - Inventors: Stephen B. Povroznik, III; Timothy R. Budd; James R. Malo - Web page: https://patentgrep.com/patent/US12179931B2 ## CPC - B64F 1/362: {Installations for supplying conditioned air to parked aircraft} - B64D 27/34: All-electric aircraft - B64D 31/06: actuated automatically - B64D 31/14: Transmitting means between initiating means and power plants - B64D 31/16: for electric power plants - B64D 41/00: Power installations for auxiliary purposes - B64D 45/00: Aircraft indicators or protectors not otherwise provided for - B64F: GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR - B64D: EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT ## Abstract Systems and methods for alerting reverse current conditions of vehicle charging systems. One embodiment provides an aircraft power system comprising an aircraft power source and a notification device. The notification device includes a control unit configured to monitor a supply of current from an external power supply to the aircraft power source and detect a reverse current condition of current flowing from the aircraft power source to the external power supply. In response to detecting the reverse current condition, the control unit is configured to provide a notification indicative of the reverse current condition. ## Claims ### Claim 1 An aircraft power system comprising: an aircraft power source; and a notification device including a first connection via a control line between the aircraft power source and an external power supply and a second connection via power line between the aircraft power source and the external power supply, the notification device including a control unit configured to: monitor a voltage value of the control line and a current value of the power line, determine, based on the voltage value and the current value, a reverse current condition of current flowing from the aircraft power source to an external power supply, and in response to detecting the reverse current condition, activate an indicator to indicate the reverse current condition. ### Claim 2 (depends on 1) The aircraft power system of claim 1, wherein the notification device is further configured to: determine, when the voltage value of the control line is above a voltage threshold, that a forward current condition is present, and determine, when the voltage value of the control line is below the voltage threshold, that the reverse current condition is present. ### Claim 3 (depends on 1) The aircraft power system of claim 1, wherein the notification device is powered by the power line. ### Claim 4 (depends on 1) The aircraft power system of claim 1, wherein the notification device includes at least one selected from a group consisting of a visual indicator and an audible indicator, and wherein the control unit is further configured to: provide power to the at least one selected from the group consisting of the visual indicator and the audible indicator to provide the notification indicative of the reverse current condition. ### Claim 5 (depends on 1) The aircraft power system of claim 1, wherein the supply of current from the external power supply to the aircraft power source is greater than 1000 amps. ### Claim 6 (depends on 1) The aircraft power system of claim 1, wherein the notification device is located within the external power supply. ### Claim 7 (depends on 1) The aircraft power system of claim 1, wherein the notification device is located within an aircraft housing the aircraft power source. ### Claim 8 A notification device including a first connection via a control line between an aircraft power source and a power supply located external to the aircraft power source and a second connection via power line between the aircraft power source and the external power supply, the notification device comprising: a controller configured to: monitor a voltage value of the control line and a current value of the power line, determine a reverse current condition based on the voltage value of the control line and the current value of the power line, and in response to detecting the reverse current condition, activate an indicator to indicate the reverse current condition. ### Claim 9 (depends on 8) The notification device of claim 8, wherein the controller is configured to detect the reverse current condition by detecting when the voltage value is below a predetermined threshold and detecting an active current on the power line. ### Claim 10 (depends on 8) The notification device of claim 8, wherein the indicator is a first visual indicator and wherein the controller is further configured to: control, in response to detecting a forward current condition, a second visual indicator. ### Claim 11 (depends on 10) The notification device of claim 10, wherein the controller is further configured to: control, in response detecting to the forward current condition, a first switch coupled between the power line and the first visual indicator to provide power to the first visual indicator, and control, in response to detecting the reverse current condition, a second switch coupled between the power line and the second visual indicator to provide power to the second visual indicator. ### Claim 12 (depends on 8) The notification device of claim 8, wherein the controller is configured to activate the indicator in response to detecting the reverse current condition by controlling the indicator to an ON condition and wherein the controller is further configured to, in response to detecting a normal operation condition, control the indicator to an OFF condition. ### Claim 13 (depends on 8) The notification device of claim 8, wherein the controller is configured to receive power from the power line. ### Claim 14 (depends on 8) The notification device of claim 8, further comprising a transceiver, and wherein the controller is further configured to: in response to detecting the reverse current condition, transmit an alert to an external device via the transceiver. ### Claim 15 A method for detecting a reverse current condition of an aircraft vehicle power system, the vehicle power system including a power supply, a vehicle power source of an aircraft, and a notification device, the notification device including a first connection via a control line between the aircraft power source and an external power supply and a second connection via a power line between the vehicle power source and the power supply, the method comprising: monitoring, with a controller included in the notification device, a voltage value of the control line and a current value of the power line, determining, with the controller, a reverse current condition where a current flows in a reverse direction from the vehicle power source to the power supply based on the voltage value of the control line and the current value of the power line, and in response to detecting the reverse current condition, activating, with the controller, at least one selected from a group consisting of a visual indicator and an audible indicator included in the notification device to indicate the reverse current condition. ### Claim 16 (depends on 15) The method of claim 15, wherein detecting the reverse current condition includes detecting when the voltage value is below a voltage threshold. ### Claim 17 (depends on 15) The method of claim 15, further comprising: in response to detecting the reverse current condition, transmitting, with the controller, a notification indicative of the reverse current condition to an external device. ### Claim 18 (depends on 15) The method of claim 15, wherein activating the at least one selected from the group consisting of the visual indicator and the audible indicator includes providing, with the notification device, power from the power line to the at least one selected from the group consisting of the visual indicator and the audible indicator. ### Claim 19 (depends on 15) The method of claim 15, wherein detecting, with the controller, the reverse current condition includes detecting the voltage value is below a predetermined threshold and detecting an active current on the power line.