# US 12,600,601 B2 · Voltage signal processing unit, landing door failure locating system and method, elevator system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,600,601 B2 - Document ID: US12600601B2 - Status: Granted - Kind: B2 - Application number: 17/520,327 - Filed: 2021-11-05 - Published: 2022-07-14 - Granted: 2026-04-14 - Earliest claimed: 2021-01-13 - Assignees: Otis Elevator Company - Applicants: Otis Elevator Company - Inventors: Bichun Li; Shenhong Wang - Web page: https://patentgrep.com/patent/US12600601B2 ## CPC - B66B 13/22: Operation of door or gate contacts - B66B 5/0031: {for safety reasons} - B66B 5/0087: {Devices facilitating maintenance, repair or inspection tasks (devices incorporated in the buffer B66B5/288; railings on top of the car B66B11/0226)} - H02J 13/13: characterised by the transmission of data to equipment in the power network - H02J 13/36: specially adapted for protection systems - 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) - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY ## Abstract A voltage signal processing unit, a landing door fault location system and method, and an elevator system. The voltage signal processing unit includes: a first voltage signal input port; a second voltage signal input port; a first electrical level signal output port; a first voltage signal collection circuit, the first voltage signal collection circuit terminates with the first voltage signal input port and the first electrical level signal output port, the first voltage signal collection circuit is adapted to collect a first voltage signal received from the first voltage signal input port as a first electrical level signal output from the first electrical level signal output port; and a voltage signal bridge circuit, the voltage signal bridge circuit terminates with the first voltage signal input port and the second voltage signal input port, a normally open relay switch is provided. ## Claims ### Claim 1 A voltage signal processing unit, characterized in that, the voltage signal processing unit comprises: a first voltage signal input port; a second voltage signal input port; a first electrical level signal output port; a first voltage signal collection circuit, the first voltage signal collection circuit terminates with the first voltage signal input port and the first electrical level signal output port, the first voltage signal collection circuit is adapted to collect a first voltage signal received from the first voltage signal input port as a first electrical level signal and output the first electrical level signal to the first electrical level signal output port; and a voltage signal bridge circuit, the voltage signal bridge circuit terminates with the first voltage signal input port and the second voltage signal input port, a normally open relay switch is provided between the first voltage signal input port and the second voltage signal input port; wherein the number of the relay switch is more than one, and each relay switch is connected in series. ### Claim 2 (depends on 1) The voltage signal processing unit according to claim 1, wherein a current limiting resistor connected in series with the relay switch is provided in the voltage signal bridge circuit. ### Claim 3 (depends on 2) The voltage signal processing unit according to claim 2, wherein a fuse connected in series with the current limiting resistor is provided in the voltage signal bridge circuit. ### Claim 4 (depends on 1) The voltage signal processing unit according to claim 1, wherein the voltage signal processing unit is further provided with a control port for independently controlling each of the relay switches. ### Claim 5 (depends on 1) The voltage signal processing unit according to claim 1, wherein the first voltage signal collection circuit comprises a first isolation device, the first isolation device isolates the first voltage signal collection circuit into an input side circuit connecting the first voltage signal input port and an output side circuit connecting the first electrical level signal output port. ### Claim 6 (depends on 5) The voltage signal processing unit according to claim 5, wherein the input side circuit comprises a divider resistor and a rectifier bridge connected in series, the rectifier bridge is connected to the first isolation device. ### Claim 7 (depends on 1) The voltage signal processing unit according to claim 1, wherein the voltage signal processing unit further comprises: a second electrical level signal output port; and a second voltage signal collection circuit, the second voltage signal collection circuit connects the second voltage signal input port and the second electrical level signal output port, the second voltage signal collection circuit is adapted to collect a second voltage signal received from the second voltage signal input port as a second electrical level signal output from the second electrical level signal output port. ### Claim 8 (depends on 7) The voltage signal processing unit according to claim 7, wherein the second voltage signal collection circuit comprises a second isolation device, the second isolation device isolates the second voltage signal collection circuit into an input side circuit connecting the second voltage signal input port and an output side circuit connecting the second electrical level signal output port. ### Claim 9 (depends on 8) The voltage signal processing unit according to claim 8, wherein the input side circuit comprises a divider resistor and a rectifier bridge connected in series, the rectifier bridge is connected to the second isolation device. ### Claim 10 (depends on 1) The voltage signal processing unit according to claim 1, wherein the voltage signal processing unit is provided with a power source interface, and also provided with a peripheral human-machine interface and/or an output display interface. ### Claim 11 (depends on 1) The voltage signal processing unit according to claim 1, wherein the voltage signal processing unit further comprises a logic control module, and the electrical level signal output port on the voltage signal processing unit and/or the control port communicates with the logic control module in a wired or wireless manner. ### Claim 12 (depends on 11) The voltage signal processing unit according to claim 11, wherein the voltage signal processing unit is further provided with a wireless communication module adapted to input and/or output communication data from the logic control module. ### Claim 13 (depends on 1) A landing door fault location system for an elevator system, characterized in that, the landing door fault location system comprises a landing door safety circuit, the landing door safety circuit comprises multiple sets of landing door switch assemblies connected in series, and each set of the landing door switch assemblies is set corresponding to a landing station of the elevator system, wherein, each set of the landing door switch assemblies is connected in parallel with the voltage signal processing unit according to claim 1, and the first voltage signal input port and the second voltage signal input port of the voltage signal processing unit electrically connect an output end and an input end of the corresponding landing door switch assembly respectively. ### Claim 14 (depends on 13) The landing door fault location system according to claim 13, wherein the landing door switch assembly comprises a door close in place switch and a door lock in place switch connected in series, and the door close in place switch and the door lock in place switch is a normally closed switch. ### Claim 15 (depends on 13) The landing door fault location system according to claim 13, wherein the landing door fault location system comprises a logic control module located in an external panel of each floor of the elevator system, and the electrical level signal output port on the voltage signal processing unit and/or the control port communicates with the logic control module in a wired or wireless manner. ### Claim 16 (depends on 15) The landing door fault location system according to claim 15, wherein the external panel is further provided with a wireless communication module adapted to input and/or output communication data from the logic control module. ### Claim 17 (depends on 13) A landing door fault location method using the landing door fault system according to claim 13. ### Claim 18 (depends on 17) The landing door fault location method according to claim 17, wherein the landing door switch assembly is connected in parallel to the voltage signal processing unit, the method comprises following steps: step A1: set n=the total number of floors of elevator travel, and then proceed to step B1; step B1: the logic control module detects the first electrical level signal of the nth floor, if it is detected that the first electrical level signal of the nth floor is ON, then reports the normality of the landing door switch of the nth floor to an elevator system control board, and then proceed to step C1, if it is detected that the first electrical level signal of the nth floor is OFF, then reports the fault of the landing door switch of the nth floor to the elevator system control board and turns on the relay switches of all the floors where the fault has been determined, and then proceed to step C1; step C1: detect the first electrical level signal of the n−1th floor, if it is detected that the first electrical level signal of the n−1th floor is ON, then reports the normality of the landing door switch of the n−1th floor to the elevator system control board, and then proceed to step F1, if it is detected that the first electrical level signal of the n−1th floor is OFF, then proceed to step D1; step D1: the logic control module queries from the elevator system control board whether there is a safety loop voltage signal at the nth floor, If yes, then reports the fault of the landing door switch of the n−1th floor to the elevator system control board, and then proceed to step E1, otherwise the event is stored and the elevator is shut down; step E1: turn on the relay switches of all floors where the fault has been determined, and proceed to step F1; step F1: judge whether n−1 is equal to 1, if yes, then proceed to step H1, otherwise proceed to step G1; step G1: set n=n−1 and return to step C1; step H1: end. ### Claim 19 (depends on 17) The landing door fault location method according to claim 17, wherein the landing door switch assembly is connected in parallel to the voltage signal processing unit, the method comprises following steps: step A2: set n=the total number of floors of elevator travel, and then proceed to step B2; step B2: the logic control module detects the first electrical level signal and the second electrical level signal of the nth floor, if it is detected that the first electrical level signal of the nth floor is ON and the second electrical level signal of the nth floor is ON, then reports the normality of the landing door switch of the nth floor to an elevator system control board, and then proceed to step D2, if it is detected that the first electrical level signal of the nth floor is OFF and the second electrical level signal of the nth floor is ON, then reports the fault of the landing door switch of the nth floor to the elevator system control board and turns on the relay switches of all the floors where the fault has been determined, and then proceed to step C2; step C2: turn on the relay switches of all floors where the fault has been determined, and proceed to step D2; step D2: judge whether n is equal to 1, if yes, then proceed to step F2, otherwise proceed to step E2; step E2: set n=n−1 and return to step B2; step F2: end. ### Claim 20 (depends on 1) An elevator system, characterized in that, the elevator system comprises the voltage signal processing unit according to claim 1.