# US 2024/0199112 A1 · Circuit and control method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2024/0199112 A1 - Document ID: US20240199112A1 - Status: Published application - Kind: A1 - Application number: 18/590,621 - Filed: 2024-02-28 - Published: 2024-06-20 - Earliest claimed: 2021-08-30 - Applicants: Huawei Technologies Co., Ltd. - Inventors: Chen LIANG; Fasong QUE; Hao ZHENG - Web page: https://patentgrep.com/patent/US20240199112A1 ## CPC - B62D 5/0481: {monitoring the steering system, e.g. failures} - B62D 5/0487: {detecting motor faults (B62D5/0496 takes precedence)} - B62D 5/046: {Controlling the motor} - H02H 3/20: responsive to excess voltage - H02H 7/08: for dynamo-electric motors - H02H 7/0838: {with H-bridge circuit} - H02M 1/0067: {Converter structures employing plural converter units, other than for parallel operation of the units on a single load} - H02M 1/0083: {Converters characterised by their input or output configuration} - H02M 1/32: Means for protecting converters other than automatic disconnection - H02M 7/5387: in a bridge configuration - H02P 27/06: using DC to AC converters or inverters (H02P27/05 takes precedence) - B62D: MOTOR VEHICLES; TRAILERS (steering, or guiding on a desired track, of agricultural machines or implements A01B69/00; wheels, castors, axles, increasing wheel adhesion B60B; vehicle tyres, tyre inflation or tyre changing B60C; connections between vehicles of a train or the like B60D; vehicles for use on rail and road, amphibious or convertible vehicles B60F; suspension arrangements B60G; heating, cooling, ventilating or other air treating devices B60H; windows, windscreens, non-fixed roofs, doors or similar devices, protective coverings for vehicles not in use B60J; propulsion plant arrangements, auxiliary drives, transmissions, controls, instrumentation or dashboards B60K; electric equipment or propulsion of electrically-propelled vehicles B60L; power supply for electrically-propelled vehicles B60M; passenger accommodation not otherwise provided for B60N; adaptations for load transportation or to carry special loads or objects B60P; arrangement of signalling or lighting devices, the mounting or supporting thereof or circuits therefor, for vehicles in general B60Q; vehicles, vehicle fittings or vehicle parts not otherwise provided for B60R; servicing, cleaning, repairing, supporting, lifting, or manoeuvring, not otherwise provided for, B60S; brake arrangements, brake control systems or parts thereof B60T; air-cushion vehicles B60V; motor-cycles, accessories therefor B62J, B62K; testing of vehicles G01M) - H02H: EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions G01R, e.g. G01R31/00, G08B; locating faults along lines G01R31/08; emergency protective devices H01H) - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) - H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS ## Abstract This application provides a circuit, including: a first circuit unit, where a first end of the first circuit unit is configured to connect to an output end of a first inverter, a second end of the first circuit unit is configured to connect to a motor, and the first circuit unit is configured to be in a disconnected state under a first condition; and a second circuit unit, where the second circuit unit is configured to absorb an energy shock, a first end of the second circuit unit is connected to the first end of the first circuit unit, and a second end of the second circuit unit is connected to the second end of the first circuit unit. ## Claims ### Claim 1 A circuit, comprising: a first circuit unit, wherein a first end of the first circuit unit is configured to connect to an output end of a first inverter, a second end of the first circuit unit is configured to connect to a motor, and the first circuit unit is configured to be in a disconnected state under a first condition; and a second circuit unit, wherein the second circuit unit is configured to absorb an energy shock, a first end of the second circuit unit is connected to the first end of the first circuit unit, and a second end of the second circuit unit is connected to the second end of the first circuit unit. ### Claim 2 (depends on 1) The circuit according to claim 1, wherein the circuit further comprises: a third circuit unit, wherein a first end of the third circuit unit is configured to connect to an output end of a second inverter, a second end of the third circuit unit is configured to connect to the motor, and the third circuit unit is configured to be in a disconnected state under a second condition; and a fourth circuit unit, configured to absorb an energy shock, wherein a first end of the fourth circuit unit is connected to the first end of the third circuit unit, and a second end of the fourth circuit unit is connected to the second end of the third circuit unit. ### Claim 3 (depends on 2) The circuit according to claim 2, wherein the motor comprises a first winding and a second winding, and that a second end of the first circuit unit is configured to connect to a motor specifically comprises: the second end of the first circuit unit is configured to connect to the first winding of the motor; and that a second end of the third circuit unit is configured to connect to the motor specifically comprises: the second end of the third circuit unit is configured to connect to the second winding of the motor. ### Claim 4 (depends on 2) The circuit according to claim 2, further comprising: a fifth circuit unit, wherein a first end of the fifth circuit unit is connected to the first end of the first circuit unit, a second end of the fifth circuit unit is connected to the second end of the third circuit unit, and the fifth circuit unit is configured to be connected under a third condition. ### Claim 5 (depends on 4) The circuit according to claim 4, wherein the third condition comprises at least one of the following: the second inverter is faulty, the third circuit unit is faulty, or the fourth circuit unit is faulty. ### Claim 6 (depends on 2) The circuit according to claim 2, further comprising: a sixth circuit unit, wherein a first end of the sixth circuit unit is connected to the first end of the third circuit unit, a second end of the sixth circuit unit is connected to the second end of the first circuit unit, and the sixth circuit unit is configured to be connected under a fourth condition. ### Claim 7 (depends on 6) The circuit according to claim 6, wherein the fourth condition comprises at least one of the following: the first inverter is faulty, the first circuit unit is faulty, or the second circuit unit is faulty. ### Claim 8 (depends on 1) The circuit according to claim 1, wherein the second circuit unit comprises a transient voltage suppression diode; and that a first end of the second circuit unit is connected to the first end of the first circuit unit, and a second end of the second circuit unit is connected to the second end of the first circuit unit specifically comprises: a first end of the transient voltage suppression diode is connected to the first end of the first circuit unit, and a second end of the transient voltage suppression diode is connected to the second end of the first circuit unit. ### Claim 9 (depends on 8) The circuit according to claim 8, wherein the second circuit unit further comprises a first resistor, a first end of the first resistor is connected to the transient voltage suppression diode, and a second end of the first resistor is connected to the second end of the first circuit unit. ### Claim 10 (depends on 9) The circuit according to claim 9, wherein the second circuit unit further comprises a first capacitor, and the first capacitor is connected in parallel to the first resistor. ### Claim 11 A circuit control method, wherein a circuit comprises a first circuit unit and a second circuit unit, a first end of the first circuit unit is configured to connect to an output end of a first inverter, a second end of the first circuit unit is configured to connect to a motor, the first circuit unit is configured to be in a disconnected state under a first condition, the second circuit unit is configured to absorb an energy shock, a first end of the second circuit unit is connected to the first end of the first circuit unit, and a second end of the second circuit unit is connected to the second end of the first circuit unit; and the method comprises: obtaining a rotational speed of the motor; if the rotational speed of the motor is less than a first threshold, determining whether the first condition is met; and when the first condition is met, controlling the first circuit unit to be in the disconnected state. ### Claim 12 (depends on 11) The method according to claim 11, wherein the first condition comprises that the energy shock is detected, wherein the energy shock comprises at least one of the following: a counter electromotive force shock or a current shock. ### Claim 13 (depends on 11) The method according to claim 11, wherein the obtaining a rotational speed of the motor specifically comprises: obtaining angular velocity information of the motor and steering wheel torque information; obtaining a first rotational speed of the motor based on the angular velocity information of the motor, and obtaining a second rotational speed of the motor based on the steering wheel torque information; and if a rotational speed difference between the first rotational speed and the second rotational speed is less than a second threshold, obtaining a third rotational speed based on the first rotational speed and the second rotational speed, and using the third rotational speed as the rotational speed of the motor. ### Claim 14 (depends on 11) The method according to claim 11, wherein the circuit further comprises a third circuit unit, a fourth circuit unit, and a fifth circuit unit; a first end of the third circuit unit is configured to connect to an output end of a second inverter, a second end of the third circuit unit is configured to connect to the motor, and the third circuit unit is configured to be in a disconnected state under a second condition; the fourth circuit unit is configured to absorb an energy shock, a first end of the fourth circuit unit is connected to the first end of the third circuit unit, a second end of the fourth circuit unit is connected to the second end of the third circuit unit, a first end of the fifth circuit unit is connected to the first end of the first circuit unit, a second end of the fifth circuit unit is connected to the second end of the third circuit unit, and the fifth circuit unit is configured to be connected under a third condition; and the method further comprises: obtaining circuit fault information; and if the circuit fault information indicates that at least one of the second inverter, the third circuit unit, or the fourth circuit unit is faulty, controlling the fifth circuit unit to be connected. ### Claim 15 (depends on 14) The method according to claim 14, wherein the circuit further comprises a sixth circuit unit, a first end of the sixth circuit unit is connected to the first end of the third circuit unit, a second end of the sixth circuit unit is connected to the second end of the first circuit unit, and the sixth circuit unit is configured to be connected under a fourth condition; and the method further comprises: if the circuit fault information indicates that at least one of the first inverter, the first circuit unit, or the second circuit unit is faulty, controlling the sixth circuit unit to be connected. ### Claim 16 A circuit control apparatus, wherein a circuit comprises a first circuit unit and a second circuit unit, a first end of the first circuit unit is configured to connect to an output end of a first inverter, a second end of the first circuit unit is configured to connect to a motor, the first circuit unit is configured to be in a disconnected state under a first condition, the second circuit unit is configured to absorb an energy shock, a first end of the second circuit unit is connected to the first end of the first circuit unit, and a second end of the second circuit unit is connected to the second end of the first circuit unit; and the control apparatus comprises: an obtaining unit, configured to obtain a rotational speed of the motor; and a control unit, configured to: when the rotational speed of the motor is less than a first threshold, determine whether the first condition is met, wherein the control unit is further configured to: when the first condition is met, control the first circuit unit to be in the disconnected state. ### Claim 17 (depends on 16) The apparatus according to claim 16, wherein the first condition comprises that the energy shock is detected, wherein the energy shock comprises at least one of the following: a counter electromotive force shock or a current shock. ### Claim 18 (depends on 16) The apparatus according to claim 16, wherein the obtaining unit is specifically configured to: obtain angular velocity information of the motor and steering wheel torque information; obtain a first rotational speed of the motor based on the angular velocity information of the motor, and obtain a second rotational speed of the motor based on the steering wheel torque information; and if a rotational speed difference between the first rotational speed and the second rotational speed is less than a second threshold, obtain a third rotational speed based on the first rotational speed and the second rotational speed, and use the third rotational speed as the rotational speed of the motor. ### Claim 19 (depends on 16) The apparatus according to claim 16, wherein the circuit further comprises a third circuit unit, a fourth circuit unit, and a fifth circuit unit; a first end of the third circuit unit is configured to connect to an output end of a second inverter, a second end of the third circuit unit is configured to connect to the motor, and the third circuit unit is configured to be in a disconnected state under a second condition; the fourth circuit unit is configured to absorb an energy shock, a first end of the fourth circuit unit is connected to the first end of the third circuit unit, a second end of the fourth circuit unit is connected to the second end of the third circuit unit, a first end of the fifth circuit unit is connected to the first end of the first circuit unit, a second end of the fifth circuit unit is connected to the second end of the third circuit unit, and the fifth circuit unit is configured to be connected under a third condition; the obtaining unit is further configured to obtain circuit fault information; and the control unit is further configured to: if the circuit fault information indicates that at least one of the second inverter, the third circuit unit, or the fourth circuit unit is faulty, control the fifth circuit unit to be connected. ### Claim 20 (depends on 19) The apparatus according to claim 19, wherein the circuit further comprises a sixth circuit unit, a first end of the sixth circuit unit is connected to the first end of the third circuit unit, a second end of the sixth circuit unit is connected to the second end of the first circuit unit, and the sixth circuit unit is configured to be connected under a fourth condition; and the control unit is further configured to: if the circuit fault information indicates that at least one of the first inverter, the first circuit unit, or the second circuit unit is faulty, control the sixth circuit unit to be connected.