# US 9,434,576 B2 · Backup circuit for electricity supply, elevator system, and method for ensuring electricity supply of an electronic overspeed governor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,434,576 B2 - Document ID: US9434576B2 - Status: Granted - Kind: B2 - Application number: 13/886,941 - Filed: 2013-05-03 - Published: 2013-09-19 - Granted: 2016-09-06 - Earliest claimed: 2010-11-18 - Assignees: Kone Corporation - Applicants: Kone Corporation - Inventors: Antti Saarelainen; Ari Kattainen; Ari Ketonen - Web page: https://patentgrep.com/patent/US9434576B2 ## CPC - B66B 1/34: Details {, e.g. call counting devices, data transmission from car to control system, devices giving information to the control system} - B66B 5/06: electrical - B66B: ELEVATORS; ESCALATORS OR MOVING WALKWAYS ({apparatus for raising or lowering persons on theatrical stages or the like A63J5/12} ; funicular railbound systems with rigid ground-supported tracks and cable traction, e.g. cliff railways, B61B9/00; arrangements of ammunition handlers in vessels B63G3/00; hoists, lifts, or conveyors for loading or unloading in general B65G; braking or detent devices controlling normal movements of winding drums or barrels B66D; ship-lifting devices E02C; garages for many vehicles with mechanical means for lifting vehicles E04H6/12; hoists for feeding ammunition or projectiles to launching apparatus or to loading mechanisms F41A9/00) ## Abstract A backup circuit for supplying electricity to an electronic overspeed governor in connection with a malfunction of a main electricity supply is disclosed. The backup circuit includes an energy storage. The backup circuit is configured to disconnect the supply of electricity from the energy storage to the electronic overspeed governor with a delay when the malfunction of the main electricity supply is detected, and when the malfunction of the main electricity supply continues for a predetermined amount of time, restarting the supply of electricity from the energy storage to the electronic overspeed governor. ## Claims ### Claim 1 A backup circuit for supplying electricity to an electronic overspeed governor in connection with a malfunction of a main electricity supply, the backup circuit comprising: an energy storage; a switch provided between the energy storage and the electronic overspeed governor; and a releasing delay circuit which forms a control signal for opening the switch in order to disconnect the supply of electricity supply from the energy storage to the electronic overspseed governor with a delay when a malfunction of the main electricity supply is detected, wherein the disconnection delay for the electricity supply of the electronic overspeed governor is determined on the basis of a stopping delay of an a apparatus monitored by the electronic overspeed governor, and when the malfunction of the main electricity supply occurss, the switch of the backup circuit is configured to close for restarting the supply of electricity from the energy storage to the electronic overspeed governor. ### Claim 2 (depends on 1) The backup circuit according to claim 1, wherein the circuit is associated with an elevator, wherein the circuit is further configured to start the supply of electricity from the energy storage to the electronic overspeed governor for the purpose of emergency drive of the elevator. ### Claim 3 (depends on 1) The backup circuit according to claim 1 is further configured to receive, after a the malfunction occurs, a control signal for starting the supply of electricity from the energy storage to the electronic overspeed governor upon closing of the switch. ### Claim 4 (depends on 1) The backup circuit according to claim 1, wherein the electronic overspeed governor is fitted to activate a gripping function when the electricity supply to the overspeed governor is disturbed. ### Claim 5 (depends on 1) The backup circuit according to claim 1, further comprising a signaling means for indicating the state of charge of the energy storage. ### Claim 6 (depends on 1) The backup circuit according to claim 1 is further configured to receive, after a the malfunction occurs, a control signal for starting the supply of electricity from the energy storage to the electronic overspeed governor upon closing of the switch. ### Claim 7 An elevator system comprising: an electronic overspeed governor for preventing unintended movement of an elevator car and/or of a counterweight; and a backup circuit for supplying electricity to the electronic overspeed governor in connection with a malfunction of a main electricity supply, the backup circuit comprising: an energy storage; a switch provided between the energy storage and the electronic overspeed governor; and a releasing delay circuit which form a control signal for opening the switch in order to disconnect the supply of electricity supply from the energy storage to the electronic overspeed governor with a delay when a malfunction of the main electricity supply is detected, wherein the disconnection delay for the electricity supply of the electronic overspeed governor is determined on the basis of a stopping delay of an apparatus monitored by the electronic overspeed governor, and when the malfunction of the main electricity supply occurs, the switch of the backup circuit is configured to close for restarting the supply of electricity supply from the energy storage to the electronic overspeed governor. ### Claim 8 (depends on 7) The backup circuit according to claim 7 wherein the circuit is further configured to start the supply of electricity from the energy storage to the electronic overspeed governor for the purpose of emergency drive of the elevator. ### Claim 9 A method for supplying electricity to an electronic overspeed governor in connection with a malfunction of a main electricity supply, comprising: disconnecting the supply of electricity supply from an energy storage to the electronic overspeed governor with a delay when a malfunction of the main electricity supply is detected, wherein the disconnection delay for the electricity supply of the electronic overspeed governor is determined on the basis of a stopping delay of an apparatus monitored by the electronic overspeed governor, and when the malfunction of the main electricity supply occurs, restarting the supply of electricity supply from the energy storage to the electronic overspeed governor. ### Claim 10 (depends on 9) The method of claim 9 wherein the method is for supplying electricity to an overspeed governor of an elevator, further comprising restarting the supply of electricity from the energy storage to the electronic overspeed governor for the purpose of emergency drive of the elevator.