# US 12,119,731 B2 · Linear actuator control circuit capable of achieving accurate positioning, and linear actuator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,119,731 B2 - Document ID: US12119731B2 - Status: Granted - Kind: B2 - Application number: 18/058,727 - Filed: 2022-11-23 - Published: 2024-01-11 - Granted: 2024-10-15 - Earliest claimed: 2022-07-06 - Assignees: Man Wah Intelligent Technology (Hui Zhou) Co., Ltd. - Applicants: Man Wah Intelligent Technology (Hui Zhou) Co., Ltd. - Inventors: Fayun Qi; Zeming Sun; Zuochao Peng; Dinglue Chen; Zilong Li; Dazhuan Tang - Web page: https://patentgrep.com/patent/US12119731B2 ## CPC - H02K 7/06: Means for converting reciprocating motion into rotary motion or vice versa - H02K 7/116: with gears - F16H 25/20: Screw mechanisms (with automatic reversal F16H25/12) - H02K 11/21: Devices for sensing speed or position, or actuated thereby (specially adapted for machines having non-mechanical commutating devices H02K29/06, H02K29/14) - H02K 41/02: Linear motors; Sectional motors - H02P 6/30: Arrangements for controlling the direction of rotation (H02P6/22 takes precedence) - H02P 7/03: for controlling the direction of rotation of DC motors - H02K 7/1166: {comprising worm and worm-wheel (structural association with bearings specially adapted for worm gear drives H02K7/081)} - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - F16H: GEARING - H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS ## Abstract Disclosed are a linear actuator control circuit capable of achieving accurate positioning, and a linear actuator. The control circuit comprises a motor driving circuit, a master control circuit and at least one intermediate switch; by disposing the intermediate switch between two ends of a stroke of the linear actuator, the intermediate switch can be triggered when the linear actuator runs to the intermediate switch; after the master control circuit receives information of the intermediate switch, running of the linear actuator is stopped, so that the linear actuator stops running when accurately running to a state that the intermediate switch is triggered, and then, accurate positioning of a sliding block on the linear actuator is achieved. ## Claims ### Claim 1 A linear actuator control circuit capable of achieving accurate positioning, characterized by comprising a motor driving circuit, a master control circuit, and at least one intermediate switch, wherein the intermediate switch and the motor driving motor are both electrically connected to the master control circuit, and the intermediate switch is located between two ends of a stroke of a linear actuator. ### Claim 2 (depends on 1) The linear actuator control circuit capable of achieving accurate positioning according to claim 1, characterized in that the intermediate switch is an ordinary switch or a switch having a memory function. ### Claim 3 (depends on 1) The linear actuator control circuit capable of achieving accurate positioning according to claim 1, characterized in that one or more intermediate switches are provided. ### Claim 4 (depends on 1) The linear actuator control circuit capable of achieving accurate positioning according to claim 1, characterized in that the motor driving circuit comprises a motor forward rotation signal input end, a motor reverse rotation signal input end, a first triode, a second triode, a first relay and a second relay, wherein the motor forward rotation signal input end and the motor reverse rotation signal input end are electrically connected to the master control circuit; the motor forward rotation signal input end is electrically connected to a base of the first triode, an emitter of the first triode is grounded, a collector of the first triode is electrically connected to one end of a coil of the first relay, an opposite end of the coil of the first relay is electrically connected to a power source of the control circuit, a common end of the first relay is electrically connected to a positive electrode of a motor of the linear actuator, a normally-closed end of the first relay is grounded, and a normally-open end of the first relay is electrically connected to an external power source; and the motor reverse rotation signal input end is electrically connected to a base of the second triode, an emitter of the second triode is grounded, a collector of the second triode is electrically connected to one end of a coil of the second relay, the other end of the coil of the second relay is electrically connected to the power source of the control circuit, a common end of the second relay is electrically connected to a negative electrode of the motor of the linear actuator, a normally-closed end of the second relay is grounded, and a normally-open end of the second relay is electrically connected to the external power source. ### Claim 5 (depends on 4) The linear actuator control circuit capable of achieving accurate positioning according to claim 4, characterized in that the motor driving circuit further comprises a push rod position detection circuit. ### Claim 6 (depends on 5) The linear actuator control circuit capable of achieving accurate positioning according to claim 5, characterized in that the push rod position detection circuit comprises an operational amplifier, wherein an input end of the operational amplifier is electrically connected to the normally-closed end of the first relay and the normally-closed end of the second relay, and an output end of the operational amplifier is electrically connected to the master control circuit. ### Claim 7 (depends on 1) The linear actuator control circuit capable of achieving accurate positioning according to claim 1, characterized by further comprising a user manual control button, wherein the user manual control button is electrically connected to the master control circuit. ### Claim 8 (depends on 1) The linear actuator control circuit capable of achieving accurate positioning according to claim 1, characterized by further comprising a power supply circuit, wherein the power supply circuit acquires power from outside and supplies power to the control circuit. ### Claim 9 (depends on 1) The linear actuator control circuit capable of achieving accurate positioning according to claim 1, characterized in that the motor driving circuit comprises a main motor driving circuit and an auxiliary motor driving circuit. ### Claim 10 A linear actuator capable of achieving accurate positioning, characterized by comprising a lead screw and a sliding block sliding along the lead screw, wherein the linear actuator further comprises a motor that drives the lead screw to rotate so as to drive the sliding block to slide along the lead screw; a first stroke switch, a second stroke switch and at least one intermediate switch are disposed on a stroke of the sliding block, the first stroke switch and the second stroke switch are located on two ends of the stroke of the sliding block, and the intermediate switch is located between the first stroke switch and the second stroke switch; and the linear actuator further comprises a control circuit, wherein the motor, the first stroke switch, the second stroke switch, and the intermediate switch are all electrically connected to the control circuit.