An intelligent door lock
By combining a Hall sensor and a mechanical switch into a rotation detection unit, the problem of high mechanical transmission resistance in smart door locks is solved, enabling automatic unlocking of the lock body driven by a motor, thus improving the convenience of unlocking and its lifespan.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN KAADAS INTELLIGENT TECH CO LTD
- Filing Date
- 2025-05-12
- Publication Date
- 2026-06-05
AI Technical Summary
In existing smart door locks, there is significant resistance in the mechanical transmission between the door handle and the lock body, which can easily cause jamming when the handle is turned or pressed down, making it difficult to unlock.
The rotation detection unit, which combines a Hall sensor and a mechanical switch, detects the rotation angle of the handle and outputs a motor drive signal to drive the motor to automatically unlock the lock body, reducing mechanical transmission resistance.
It effectively reduces the slow response speed and wear of mechanical transmission structures, and improves the convenience of unlocking and the service life of smart door locks.
Smart Images
Figure CN224326128U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of smart door locks, and more particularly to a smart door lock. Background Technology
[0002] Existing smart door locks are divided into semi-automatic lever handle type and push-pull type. The push-pull door lock uses a pure mechanical lock body, with handles on both the inner and outer sides of the door panel. The handles are connected to the bolt through a mechanical transmission device inside the lock body. After the password, fingerprint, magnetic card, etc. are verified, the lock cylinder of the smart door lock releases the clutch through the motor. The bolt is directly connected to the push-pull handle of the door lock through a mechanical structure. When the user turns the handle, the external force of turning drives the bolt through mechanical transmission, thereby opening the door.
[0003] In actual use, the mechanical structure inside the lock body is prone to wear and deformation, which can lead to mechanical transmission failure. This can cause the user to get stuck when turning or pressing down the handle, resulting in greater unlocking resistance and affecting the user experience.
[0004] Therefore, existing technologies still need to be improved and developed. Summary of the Invention
[0005] In view of the shortcomings of the prior art, the purpose of this application is to provide an intelligent door lock to solve the problem that there is a large resistance in the mechanical transmission between the door handle and the lock body in the prior art, which easily causes jamming when the handle is turned or pressed down, making it difficult to unlock.
[0006] The technical solution of this application is as follows:
[0007] A smart door lock includes a housing, a main board, a handle disposed outside the housing, a transmission component disposed inside the housing, a rotation indicator component, a rotation detection unit, a control unit, a motor, and a lock body; wherein,
[0008] The handle is rotatably disposed in front of the housing; the housing has a through hole at the transmission shaft of the transmission component, through which the transmission component is connected to the handle; the rotation indicator is located on the transmission component and is used to indicate the rotation angle of the handle.
[0009] The rotation detection unit is mounted on the motherboard and connected to the control unit. When the rotation indicator rotates to a position relative to the rotation detection unit, the rotation detection unit outputs a position signal.
[0010] The control unit is mounted on the motherboard and is electrically connected to the rotation detection unit and the motor respectively. The control unit is used to output a motor drive signal when the position signal is acquired, and to control the motor to work through the motor drive signal.
[0011] The lock body is connected to the motor and is used to collect the motor drive signal and drive the motor to automatically unlock the lock body.
[0012] In a further embodiment of this application, the rotation detection module includes a first rotation detection unit and a second rotation detection unit. The first rotation detection unit and the second rotation detection unit are located inside the housing and are configured in conjunction with the rotation indicator component. The first rotation detection unit is located clockwise from the initial position of the rotation indicator component, and the second rotation detection unit is symmetrically arranged with the first rotation detection unit.
[0013] In a further embodiment of this application, the rotation indicator is a magnet, the rotation detection unit is a Hall effect sensor, and the magnet is installed in the groove of the transmission component.
[0014] In a further embodiment of this application, the rotation indicator component further includes a protrusion, and the rotation detection unit further includes a mechanical switch unit. The protrusion is disposed outwardly on the transmission component, and the mechanical switch unit is disposed inside the housing in cooperation with the protrusion. The protrusion is located on the side of the magnet away from the center of the transmission component; the mechanical switch unit is disposed in cooperation with the protrusion.
[0015] In a further configuration of this application, the first rotation detection unit is located at a 45-degree counterclockwise position from the initial position of the rotation indicator component, and the second rotation detection unit is located at a 45-degree clockwise position from the initial position of the rotation indicator component. The handle and the transmission component can rotate in both directions.
[0016] In a further embodiment of this application, the control unit includes a main control chip and a motor drive circuit. The main control chip is connected to both the rotation detection unit and the motor drive circuit, and is used to output a door lock trigger signal when the position signal is received. The motor drive circuit is connected to the motor and is used to output a motor drive signal when the door lock trigger signal is acquired, thereby driving the motor to work.
[0017] A further provision of this application includes a battery and a step-down circuit. The battery provides the power supply voltage, and the step-down circuit is connected to the power supply voltage and is also connected to the main control chip and the rotation detection unit for step-down and voltage regulation of the power supply voltage. The step-down circuit includes: a first inductor, a second inductor, a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, and a step-down voltage regulator chip.
[0018] One end of the first inductor is connected to the power supply voltage, and the other end of the first inductor is connected to the power supply terminal of the buck regulator chip; one end of the first capacitor, one end of the second capacitor, and one end of the third capacitor are respectively connected to the power supply terminal of the buck regulator chip, and the other ends of the first capacitor, the second capacitor, and the third capacitor are grounded; the enable terminal of the buck regulator chip is respectively connected to one end of the first resistor and one end of the second resistor, the other end of the first resistor is connected to the main control chip, and the other end of the second resistor is grounded; the switching control terminal of the buck regulator chip is connected to one end of the second inductor, and the common connection of the other end of the second inductor and the output voltage detection terminal of the buck regulator chip is connected to the rotation detection... The unit is connected to one end of the third resistor, the other end of the third resistor is connected to one end of the fourth resistor, the other end of the fourth resistor is grounded, one end of the fourth capacitor and the output voltage detection terminal of the buck regulator chip are respectively connected to the common terminal of the third resistor and the second inductor, one end of the fifth capacitor, one end of the sixth capacitor and one end of the seventh capacitor are respectively connected to the common terminal of the rotation detection unit and the second inductor, the configuration terminal of the buck regulator chip and the other end of the fourth capacitor are respectively connected to the common terminal of the third resistor and the fourth resistor, the mode selection terminal of the buck regulator chip, the ground terminal of the buck regulator chip, the other end of the fifth capacitor, the other end of the sixth capacitor and the other end of the seventh capacitor are grounded.
[0019] In a further embodiment of this application, the motor drive circuit includes: a motor drive chip, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, and a thirteenth capacitor; wherein,
[0020] One end of the fifth resistor is connected to the first motor control terminal of the main control chip; the other end of the fifth resistor and one end of the seventh resistor are respectively connected to the inverting input terminal of the motor drive chip; one end of the sixth resistor is connected to the second motor control terminal of the main control chip; the other end of the sixth resistor and one end of the eighth resistor are respectively connected to the forward rotation input terminal of the motor drive chip; the other end of the seventh resistor and the other end of the eighth resistor are grounded; the ground terminal of the motor drive chip is connected to one end of the ninth resistor; the other end of the ninth resistor and one end of the eighth capacitor are respectively connected to the analog-to-digital sampling terminal of the main control chip; the other end of the eighth capacitor is grounded; one end of the ninth capacitor and one end of the tenth resistor are respectively connected to the common ground terminal of the ninth resistor and the motor drive chip; the other ends of the ninth capacitor and the tenth resistor are grounded. The power supply terminal of the motor drive chip is connected to the power supply voltage. One end of the tenth capacitor, one end of the eleventh capacitor, and one end of the twelfth capacitor are respectively connected to the power supply terminal of the motor drive chip. The other ends of the tenth capacitor, the eleventh capacitor, and the twelfth capacitor are grounded. The common terminal of the first reverse output terminal and the second reverse output terminal of the motor drive chip is connected to the reverse control terminal of the motor. The common terminal of the first forward output terminal and the second forward output terminal of the motor drive chip is connected to the forward output terminal of the motor. One end of the thirteenth capacitor is connected to the common terminal of the first reverse output terminal and the second reverse output terminal of the motor drive chip. The other end of the thirteenth capacitor is connected to the common terminal of the first forward output terminal and the second forward output terminal of the motor drive chip.
[0021] In a further embodiment of this application, the Hall sensor unit includes: a fourteenth capacitor and a sensor chip, wherein the power supply terminal of the sensor chip is connected to one end of the fourteenth capacitor and the step-down circuit, the other end of the fourteenth capacitor and the ground terminal of the sensor chip are grounded, and the output terminal of the sensor chip is connected to the control unit.
[0022] In a further embodiment of this application, the mechanical switch unit includes a single-pole double-throw limit switch, the common terminal of which is connected to the control unit, the normally closed terminal of which is left floating, and the normally open terminal of which is grounded.
[0023] This application discloses an intelligent door lock, comprising a housing, a main board, a handle disposed outside the housing, a transmission component disposed inside the housing, a rotation indicator component, a rotation detection unit, a control unit, a motor, and a lock body; wherein, the handle is rotatably disposed in front of the housing relative to the housing; the housing has a through hole at a corresponding position of the transmission shaft of the transmission component, through which the transmission component passes and connects to the handle; the rotation indicator component is located on the transmission component and is used to indicate the rotation angle of the handle; the rotation detection unit is disposed on the main board and connected to the control unit, and when the rotation indicator component rotates to a position relative to the rotation detection unit, the rotation detection unit outputs a position signal; the control unit is disposed on the main board and electrically connected to both the rotation detection unit and the motor, and the control unit outputs a motor drive signal when the position signal is acquired, and controls the motor to work through the motor drive signal; the lock body is connected to the motor, and is used to acquire the motor drive signal and drive the motor to achieve automatic unlocking of the lock body. This application adds electronic assistance to the traditional lock body. The rotation detection unit detects the rotation of the handle and drives an external motor to drive the lock body to rotate, thereby reducing the resistance of the handle rotation and realizing electronic assistance for opening the door. Attached Figure Description
[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the units shown in these drawings without creative effort.
[0025] Figure 1 This is a structural block diagram of a preferred embodiment of the smart door lock in this application.
[0026] Figure 2 This is a structural schematic diagram of a preferred embodiment of the smart door lock in this application.
[0027] Figure 3 This is a structural block diagram of a preferred embodiment of the smart door lock in this application.
[0028] Figure 4 This is the circuit schematic of the step-down circuit in this application.
[0029] Figure 5 This is a circuit diagram of the motor drive circuit in this application.
[0030] Figure 6 This is a circuit schematic of the Hall sensor unit in this application.
[0031] Figure 7This is the circuit diagram of the mechanical switch unit in this application.
[0032] Figure 8 This is the first part of the circuit schematic diagram of the main control chip in this application.
[0033] Figure 9 This is the circuit schematic diagram of the second part of the main control chip in this application.
[0034] The following are the markings in the attached diagram: 1. Handle; 2. Transmission component; 21. Transmission shaft; 3. Rotation indicator component; 4. Rotation detection unit; 401. First rotation detection unit; 4011. First Hall sensor unit; 4012. First mechanical switch unit; 402. Second rotation detection unit; 4021. Second Hall sensor unit; 4022. Second mechanical switch unit; 5. Control unit; 51. Motor drive circuit; 6. Motor; 7. Lock body; 8. Main board; 9. Battery; 10. Step-down circuit; H1. Smart door lock; H2. Rear lock. Detailed Implementation
[0035] This application provides a smart door lock. To make the purpose, technical solution, and effects of this application clearer and more explicit, the following detailed description is provided with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.
[0036] In the implementation methods and scope of the claims, unless otherwise specified in the text, the terms "a," "an," "the," and "the" may also include plural forms. If the embodiments of this application involve descriptions of "first," "second," etc., such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.
[0037] It should be further understood that the term "comprising" as used in this application means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, "connected" or "coupled" as used herein can include wireless connections or wireless coupling. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items.
[0038] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.
[0039] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.
[0040] The applicant's research revealed that traditional smart lock handles (1) and the lock body / latch primarily rely on a purely mechanical structure for transmission. When a user applies external force to handle 1, rotating it causes the internal mechanical structure and latch to slide horizontally, opening the door. The friction between these mechanical components creates resistance, hindering the rotation of handle 1 and leading to difficulty in opening or increased response time, making it unsuitable for use by the elderly and children. Furthermore, due to varying user habits with semi-automatic lever handles (1), the rotation force and angle can easily exceed the set range, causing significant wear and deformation of the internal mechanical structure within a short period, drastically shortening the lock's lifespan.
[0041] To resolve the above technical issues, please refer to the following: Figure 1 and Figure 2 This application discloses an intelligent door lock, comprising a housing (not shown in the figure), a main board 8, a handle 1 disposed outside the housing, a transmission component 2 disposed inside the housing, a rotation indicator component 3, a rotation detection unit 4, a control unit 5, a motor 6, and a lock body (not shown in the figure); wherein, the handle 1 is rotatably disposed in front of the housing; the housing has a through hole at a corresponding position of the transmission shaft 21 of the transmission component, and the transmission component 2 passes through the through hole and is connected to the handle 1; the rotation indicator component 3 is located on the transmission component 2 and is used to indicate the rotation angle of the handle 1; The rotation detection unit 4 is mounted on the main board and connected to the control unit 5. When the rotation indicator 3 rotates to a position relative to the rotation detection unit 4, the rotation detection unit 4 outputs a position signal. The control unit 5 is mounted on the main board and electrically connected to the rotation detection unit 4 and the motor 6 respectively. The control unit 5 is used to output a drive signal for the motor 6 when the position signal is collected, and to control the operation of the motor 6 through the drive signal. The lock body is connected to the motor 6 and is used to collect the drive signal of the motor 6 and drive the motor 6 to realize automatic unlocking of the lock body.
[0042] Specifically, Figure 1 The diagram shows the internal structure of the smart lock housing. The housing protects the internal electronic circuitry, mechanical structure, and lock body. The lock body (not shown) includes a bolt and a mechanism for driving the bolt switch. By controlling the lock body, the bolt's extension and retraction can be controlled. A through hole is provided at the corresponding position of the transmission shaft 21 of the transmission component 2. The transmission shaft 21 extends outward from the through hole and is fixedly connected to the handle 1 outside the housing. The transmission component 2 is rotatably disposed inside the housing and rotates synchronously with the handle 1. The rotation detection unit 4 is arranged around the periphery of the transmission component 2. The transmission component 2 is a circular transmission disc. The rotation indicator 3 is located away from the center of the transmission component 2 and rotates synchronously with it to indicate the rotation angle of the handle. Preferably, to visually represent the relative positions of the transmission component 2, the rotation indicator 3, and the rotation detection unit 4, a two-dimensional coordinate axis is established with the axis of the transmission component 2 as the origin. The positive X-axis is 0°, and the counterclockwise direction is positive. The initial position of the rotation indicator component 3 is located at 90° of the rotation unit, and the rotation detection unit 4 is offset from the rotation indicator component 3 by a predetermined angle. When the handle 1 rotates through a predetermined angle, the transmission component 2 rotates synchronously with the handle 1, causing the rotation indicator component 3 on it to rotate relative to the housing and other units inside the housing. The predetermined angle is 45° clockwise, that is, when the transmission component 2 and the rotation indicator component 3 rotate clockwise by more than or equal to 45°, the rotation indicator component 3 and the rotation detection unit 4 are at the minimum distance position, and the rotation detection unit 4 records the position signal at this time. The control unit 5 collects the position signal at this time and outputs a motor drive signal to control the motor 6 to drive the bolt in the lock body to retract, and the door panel can rotate freely, thereby realizing the automatic opening of the handle 1. In this application, the motor 6 provides the kinetic energy required to control the opening of the lock body, realizing electronic assistance in the process of opening the handle 1 and reducing mechanical wear.
[0043] Furthermore, the rotation detection module includes a first rotation detection unit 4014 and a second rotation detection unit 4024. The first and second rotation detection units 4014 are located within the housing and are configured in conjunction with the rotation indicator component 3. The first rotation detection unit 4014 is positioned clockwise from the initial position of the rotation indicator component 3, and the second rotation detection unit 4024 is symmetrically positioned with respect to the first rotation detection unit 4014. Simultaneously, the first and second rotation detection units 4014 can be symmetrically positioned relative to the initial position of the rotation indicator component 3, or they can be configured with different directional angles relative to the initial position of the rotation indicator component 3. Specifically, the first rotation detection unit 4014 is located at a 45-degree counterclockwise position from the initial position of the rotation indicator component 3, and the second rotation detection unit 4024 is located at a 45-degree clockwise position from the initial position of the rotation indicator component 3. The handle 1 and the transmission component 2 can rotate in both directions. The arrangement of the rotation indicator component 3 means that the first rotation detection unit 4014 and the second rotation detection unit 4024 are arranged perpendicular to the outer periphery of the rotation indicator component 3, and the detection direction is directed towards the rotation axis of the rotation indicator component 3. In use, when the handle 1 is rotated clockwise or counterclockwise, the transmission component 2 is rotated 45° in any direction. The rotation indicator component 3 triggers the first rotation detection unit 4014 at 135° or the second rotation detection unit 4024 at 45°, and the smart door lock can control the bolt to slide open the door.
[0044] Furthermore, please refer to the following: Figure 3 , Figure 4 , Figure 8 and Figure 9This application also includes a battery 9 and a step-down circuit 10. The battery 9 provides a power supply voltage, and the step-down circuit 10 is connected to the power supply voltage and is connected to the main control chip U2 and the rotation detection unit 4 respectively, for stepping down and regulating the power supply voltage. The step-down circuit 10 includes: a first inductor L1, a second inductor L2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, and a step-down regulator. A step-down voltage regulator chip is described; wherein one end of the first inductor L1 is connected to the power supply voltage, and the other end of the first inductor L1 is connected to the power supply terminal of the step-down voltage regulator chip; one end of the first capacitor C1, one end of the second capacitor C2, and one end of the third capacitor C3 are respectively connected to the power supply terminal of the step-down voltage regulator chip, and the other ends of the first capacitor C1, the second capacitor C2, and the third capacitor C3 are grounded; the enable terminal of the step-down voltage regulator chip is respectively connected to one end of the first resistor R1 and one end of the second resistor R2, and the other end of the first resistor R1 is grounded. One end of the second resistor R2 is connected to the main control chip U2, and the other end of the second resistor R2 is grounded. The switching control terminal of the step-down regulator chip is connected to one end of the second inductor L2. The common connection of the other end of the second inductor L2 and the output voltage detection terminal of the step-down regulator chip is connected to the rotation detection unit 4 and one end of the third resistor R3. The other end of the third resistor R3 is connected to one end of the fourth resistor R4, and the other end of the fourth resistor R4 is grounded. One end of the fourth capacitor C4 and the output voltage detection terminal of the step-down regulator chip are respectively connected to the third resistor R4. The common terminal of R3 and the second inductor L2 is connected. One end of the fifth capacitor C5, one end of the sixth capacitor C6, and one end of the seventh capacitor C7 are respectively connected to the common terminal of the rotation detection unit 4 and the second inductor L2. The configuration terminal of the buck regulator chip and the other end of the fourth capacitor C4 are respectively connected to the common terminal of the third resistor R3 and the fourth resistor R4. The mode selection terminal of the buck regulator chip, the ground terminal of the buck regulator chip, and the other ends of the fifth capacitor C5, the sixth capacitor C6, and the seventh capacitor C7 are grounded.
[0045] Specifically, the circuit of the main control chip U2 is as follows: Figure 8 and Figure 9As shown, it is used to receive the signal output by the rotation detection unit 4 and preprocess the signal. Optionally, the main control chip U2 is model HS6621CG-C. When the main control chip U2 acts as a slave device, it receives and executes instructions from the host computer, and simultaneously feeds back and reports information from the slave device. The step-down regulator chip is model TPS629210 / NC, used to realize synchronous step-down DC / DC conversion and step down and regulate the 8.4V power supply voltage to 3.3V to adapt to the operating voltage of the main control chip U2 and other circuits such as the sensor module. The main control chip can also be used to realize remote wireless control, data communication and other functions, which will not be described in detail here.
[0046] For further details, please refer to the following: Figure 2 and Figure 3 The rotation indicator 3 is a magnet, and the rotation detection unit 4 is a Hall sensor unit. The magnet is installed in the groove of the transmission component 2. Hall sensor technology is mature and widely used in consumer electronics, industrial products, and other fields. Due to its sensitive characteristics, fast response speed, long life, and stable performance, it meets the requirements of ease of operation and reliability in practical industrial applications. When the handle 1 is rotated to a predetermined angle, when the magnet at the transmission mechanism approaches or contacts the Hall sensor unit, the Hall switch is triggered and outputs a position signal because of the magnetic induction intensity inside the Hall switch due to the external magnetic field of the magnet. The Hall sensor unit includes a fourteenth capacitor and a sensor chip. The power supply terminal of the sensor chip is connected to one end of the fourteenth capacitor and the step-down circuit 10, respectively. The other end of the fourteenth capacitor and the ground terminal of the sensor chip are grounded. The output terminal of the sensor chip is connected to the control unit 5.
[0047] Taking the first Hall sensor unit as an example, the circuit diagram of the Hall sensor unit is as follows: Figure 6 As shown, the Hall sensor unit includes a fourteenth capacitor and a sensor chip. The power supply terminal of the sensor chip is connected to one end of the fourteenth capacitor and the step-down circuit 10, respectively. The other end of the fourteenth capacitor is grounded to the ground terminal of the sensor chip. The output terminal of the sensor chip is connected to the control unit 5. Specifically, the sensor chip is connected to the main control chip U2 of the control unit 5. The sensor chip is a Hall switch MT8831AT, and the sensor chip has a built-in high-sensitivity horizontal Hall plate. When the magnet on the transmission component 2 is sufficiently close to the sensor chip, the magnetic induction intensity is greater than the working threshold of the sensor chip. The sensor chip outputs a low level to the detection angle of the main control chip U2, which is regarded as outputting a position signal to the main control chip U2. The second Hall sensor unit 4021 in the second rotation detection unit 402 is the same as the first Hall sensor unit 4011, and will not be described again here.
[0048] In a further embodiment of a preferred embodiment of this application, the rotation indicator component 3 further includes a protrusion, and the rotation detection unit 4 further includes a mechanical switch unit. The protrusion is disposed outwardly on the transmission component 2, and the mechanical switch unit is disposed inside the housing in cooperation with the protrusion. The protrusion is located on the side of the magnet away from the center of the transmission component 2. The mechanical switch unit is disposed in cooperation with the protrusion.
[0049] Specifically, when the handle 1 is configured to rotate in both directions, the first rotation detection unit 401 is equipped with a first Hall sensor unit 4011 and a first mechanical switch unit 4012, and the second rotation detection unit 402 is equipped with a second Hall sensor unit 4021 and a second mechanical switch unit 4022. The smart lock can be triggered to open by a magnet and the Hall sensor unit, or by a protrusion and the mechanical switch unit, thereby improving the adaptability of the smart lock structure to different storage, transportation, and usage environments. When the Hall sensor unit fails in a humid environment, the smart lock can continue to work through the protrusion and mechanical switch structure because the mechanical switch is waterproof. When the mechanical switch wears down due to long-term operation in a dry environment, resulting in poor contact between the mechanical switch and the protrusion, the smart lock can continue to work through the Hall effect of the magnet and the Hall sensor module, while achieving module redundancy for position detection and extending the working life of the smart lock. Meanwhile, those skilled in the art will understand that the first rotation detection unit 4014 may only be provided with a mechanical switch unit or a Hall sensor unit, while the second rotation detection unit 4024 may be provided with a Hall sensor unit or a mechanical switch unit; or the first rotation detection unit 4014 and the second rotation detection unit 4024 may each be provided with a mechanical switch unit to realize rotation detection and electronic assistance door opening.
[0050] For example, the connection relationship of the mechanical switching units is taken as an example with the first mechanical switching unit, such as... Figure 7As shown, the mechanical switch unit is connected to the main control chip U2. The mechanical switch unit includes a single-pole double-throw limit switch SW1. The common terminal of the single-pole double-throw limit switch SW1 is connected to the control unit 5. The normally closed terminal of the single-pole double-throw limit switch SW1 is left floating, and the normally open terminal of the single-pole double-throw limit switch SW1 is grounded. When the rotation indicator component 3 approaches the rotation detection unit 4, the convex point pushes the single-pole double-throw switch until the normally open terminal of the convex point pushes the single-pole double-throw switch and the common terminal of the convex point pushes the single-pole double-throw switch are connected. The corresponding detection terminal of the main control chip U2 is grounded, and the position signal is a low level at the detection terminal of the main control chip U2. After the switch is triggered, a low level is output. After being processed by the main control chip U2, a motor drive signal for enabling the motor 6 is output, and the motor 6 drive current is also output. The motor drive circuit 51, after being amplified by the motor drive chip U4, drives the lock body of the door to rotate, thereby opening the door.
[0051] Further, please refer to Figure 5The control unit includes a main control chip and a motor drive circuit. The main control chip is connected to both the rotation detection unit and the motor drive circuit, and is used to output a door lock trigger signal when the position signal is received. The motor drive circuit is connected to the motor and is used to output a motor drive signal to drive the motor when the door lock trigger signal is acquired. The motor drive circuit 51 includes: a motor drive chip U4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, and a thirteenth capacitor C13. Specifically, one end of the fifth resistor R5 is connected to the first motor control terminal of the main control chip U2; the other end of the fifth resistor R5 and one end of the seventh resistor R7 are respectively connected to the reverse input terminal of the motor drive chip U4; one end of the sixth resistor R6 is connected to the second motor control terminal of the main control chip U2; the other end of the sixth resistor R6 and one end of the eighth resistor R8 are respectively connected to the forward input terminal of the motor drive chip U4; the other end of the seventh resistor R7 and the other end of the eighth resistor R8 are grounded; the ground terminal of the motor drive chip U4 is connected to one end of the ninth resistor R9; the other end of the ninth resistor R9 and the eighth resistor R8 are connected to the ground terminal of the motor drive chip U4. One end of capacitor C8 is connected to the analog-to-digital sampling terminal of the main control chip U2, and the other end of capacitor C8 is grounded. One end of capacitor C9 and one end of resistor R10 are connected to the common terminal of resistor R9 and the ground terminal of motor drive chip U4, respectively. The other ends of capacitor C9 and resistor R10 are grounded. The power supply terminal of motor drive chip U4 is connected to the power supply voltage. One end of capacitor C10, one end of capacitor C11, and one end of capacitor C12 are connected to the power supply terminal of motor drive chip U4, respectively. The other ends of capacitor C10, C11, and C12 are connected to the power supply terminal of motor drive chip U4, respectively. The other end of C12 is grounded; the common terminal of the first reverse output terminal and the second reverse output terminal of the motor driver chip U4 is connected to the reverse control terminal of the motor 6, the common terminal of the first forward output terminal and the second forward output terminal of the motor driver chip U4 is connected to the forward output terminal of the motor 6, one end of the thirteenth capacitor C13 is connected to the common terminal of the first reverse output terminal and the second reverse output terminal of the motor driver chip U4, and the other end of the thirteenth capacitor C13 is connected to the common terminal of the first forward output terminal and the second forward output terminal of the motor driver chip U4.
[0052] Specifically, the motor drive chip U4 is a DC bidirectional motor drive integrated chip TMI8261. The two logic input terminals of the motor drive chip U4, namely the inverted input terminal and the forward input terminal, are used as inputs for the PWM control mode to control the direction of the current flowing through the H-bridge, thereby controlling the rotation direction of the DC motor 6. It also has a certain withstand voltage capability and the ability to release the reverse impact current of the inductive load. The motor drive circuit 51 is used to convert the signal output by the main control chip U2 into a drive signal that can be used to control the motor 6. The motor 6 is directly connected to the lock body and drives the bolt in the lock body to retract when the handle 1 is turned. That is, in this application, the power required for the bolt to open the door is entirely provided by the motor 6, which improves the consistency of the driving force applied to the lock body when the smart door lock is opened.
[0053] Please see Figure 3 The smart door lock H1 enables electronically assisted door opening. The smart door lock H1 is connected to the rear lock H2. To simplify the lock structure, the rear lock H2 may also include a handle, transmission components, a rotation indicator component, and a rotation detection unit. The rotation detection unit in the rear lock H2 is connected to the control unit in the smart door lock H1. Alternatively, the rear lock H2 may have the same structure as the smart door lock H1 in this application, and communicate serially with the main control chip U2 in the smart door lock H1 via its internal main control chip. The circuit structure for rotation detection in the rear lock H2 is the same as that in the smart door lock H1, and will not be described again here. Specifically, the smart door lock H1 is mounted on the door panel, and the rear lock H2 is mounted on the back side of the door panel opposite to the smart door lock H1. In specific implementations, the smart door lock H1 can serve as the outer door lock and the rear lock H2 as the inner door lock, or vice versa, as long as the rear lock H2 can drive the lock body to rotate. When a user approaches the smart door lock and turns handle 1 clockwise or counterclockwise, handle 1 causes the magnet and protrusions on the transmission component 2 to rotate together. The magnet triggers a sensor, the main control chip U2 responds, and the motor drive chip U4 operates, driving the motor 6 to rotate, thus realizing the electronic assistance function for opening the door from the inside. The working principle of this electronic assistance function is as follows:
[0054] When the smart lock is in standby mode: Battery 9 supplies power to the power and enable terminals of the step-down regulator chip in the step-down circuit 10, i.e., pin 6 (VIN) and pin 7 (EN). The 6V power supply voltage is regulated and outputs a +3V3 operating voltage from the output voltage detection terminal and the switch control terminal, i.e., pin 3 (VOS) and pin 4 (SW). This voltage then supplies power to the power supply and backup power supply terminals of the main control chip U2, i.e., pin 6 (VBAT) and pin 7 (VBAT_RF), through the main control chip inductor La3. Simultaneously, the step-down circuit 10 provides operating voltage to the power supply terminals of the sensor chips in the first Hall sensor unit 4011 and the second Hall sensor unit 4021, i.e., pin 1 (VCC) of the sensor chips. Battery 9 directly supplies power to the power supply terminal of the motor drive chip U4, i.e., pin 4 (VCC).
[0055] When the smart lock is in working condition: When the user turns handle 1 clockwise or counterclockwise, the magnet and protrusions on handle 1 rotate together, triggering the Hall sensor unit or mechanical switch unit on the transmission component 2. This triggers the output of the sensor chip of the first rotation detection unit 4014 (Hall_INT2), the output of the sensor chip of the second rotation detection unit 4024 (Hall_INT1), the common terminal on the mechanical switch of the first rotation detection unit 4014, and the common terminal on the mechanical switch of the second rotation detection unit 4024, respectively, which are connected to pins 43, 42, and 46 of the main control chip U2. The input signals are obtained from pins 45 and 46 of the serial port. After processing by the main control chip U2, the acquired signals are output as motor drive signals. Pins 25 (MOTO_R) and 26 (MOTO_F) of the main control chip U2 output drive signals to motor 6. The reverse and forward input terminals of the motor drive chip U4, namely pins 1 (BI) and 2 (FI), acquire the drive signals. After amplification of the drive power, the corresponding motor drive signals are output from the first forward output terminal, the first reverse output terminal, the first reverse output terminal, and the second reverse output terminal of the drive chip, namely pins 5 (FO_1), 6 (FO_2), 7 (BO_1), and 8 (BO_2). The drive motor 6 drives the door lock to open the door, realizing the power assist function.
[0056] In summary, this application provides a smart door lock, the technical effects of which are as follows:
[0057] This application combines Hall effect sensors and mechanical switches, adding electronic assistance to the handle. This effectively reduces the slow response speed of existing mechanical transmission structures during use, optimizes the user experience, and extends the service life of the smart lock.
[0058] This application uses Hall effect sensors and mechanical switches as sensors for the assist device. Through chip control processing, the mechanical rotation trend when the handle is rotated is instantly output as a motor drive signal, driving an external motor to rotate the lock body and realize the door opening function. This effectively reduces the user's effort and achieves rapid response, enabling quick opening from the inside.
[0059] It should be understood that the application of this application is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.
Claims
1. A smart door lock, characterized in that, It includes a housing, a main board, a handle located outside the housing, a transmission component located inside the housing, a rotation indicator component, a rotation detection unit, a control unit, a motor, and a lock body; wherein, The handle is rotatably disposed at the front of the housing; The housing has a through hole at the corresponding position of the transmission shaft of the transmission component, and the transmission component passes through the through hole to connect with the handle; the rotation indicator is located on the transmission component and is used to indicate the rotation angle of the handle. The rotation detection unit is mounted on the motherboard and connected to the control unit. When the rotation indicator rotates to a position relative to the rotation detection unit, the rotation detection unit outputs a position signal. The control unit is mounted on the motherboard and is electrically connected to the rotation detection unit and the motor respectively. The control unit is used to output a motor drive signal when the position signal is acquired, and to control the motor to work through the motor drive signal. The lock body is connected to the motor and is used to collect the motor drive signal and drive the motor to automatically unlock the lock body.
2. The smart door lock according to claim 1, characterized in that, The rotation detection module includes a first rotation detection unit and a second rotation detection unit. The first rotation detection unit and the second rotation detection unit are located inside the housing and are configured in conjunction with the rotation indicator component. The first rotation detection unit is located clockwise from the initial position of the rotation indicator component, and the second rotation detection unit is symmetrically arranged with the first rotation detection unit.
3. The smart door lock according to claim 2, characterized in that, The first rotation detection unit is located at a 45-degree counterclockwise position from the initial position of the rotation indicator component, and the second rotation detection unit is located at a 45-degree clockwise position from the initial position of the rotation indicator component. The handle and the transmission component can rotate in both directions.
4. The smart door lock according to claim 1, characterized in that, The rotation indicator is a magnet, the rotation detection unit is a Hall sensor unit, and the magnet is installed in the groove of the transmission component.
5. The smart door lock according to claim 4, characterized in that, The rotation indicator component further includes a protrusion, and the rotation detection unit further includes a mechanical switch unit. The protrusion is protruding outward on the transmission component. The mechanical switch unit is disposed inside the housing in cooperation with the protrusion. The protrusion is located on the side of the magnet away from the center of the transmission component. The mechanical switch unit is disposed in cooperation with the protrusion.
6. The smart door lock according to claim 4, characterized in that, The control unit includes a main control chip and a motor drive circuit. The main control chip is connected to the rotation detection unit and the motor drive circuit respectively, and is used to output a door lock trigger signal when the position signal is received. The motor drive circuit is connected to the motor and is used to output a motor drive signal when the door lock trigger signal is collected, so as to drive the motor to work.
7. The smart door lock according to claim 6, characterized in that, The control unit further includes a battery and a step-down circuit. The battery provides the power supply voltage, and the step-down circuit is connected to the power supply voltage and is also connected to the main control chip and the rotation detection unit to step down and regulate the power supply voltage. The step-down circuit includes: a first inductor, a second inductor, a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, and a step-down regulator chip. One end of the first inductor is connected to the power supply voltage, and the other end of the first inductor is connected to the power supply terminal of the buck regulator chip; one end of the first capacitor, one end of the second capacitor, and one end of the third capacitor are respectively connected to the power supply terminal of the buck regulator chip, and the other ends of the first capacitor, the second capacitor, and the third capacitor are grounded; the enable terminal of the buck regulator chip is respectively connected to one end of the first resistor and one end of the second resistor, the other end of the first resistor is connected to the main control chip, and the other end of the second resistor is grounded; the switching control terminal of the buck regulator chip is connected to one end of the second inductor, and the common connection of the other end of the second inductor and the output voltage detection terminal of the buck regulator chip is connected to the rotation detection... The unit is connected to one end of the third resistor, the other end of the third resistor is connected to one end of the fourth resistor, the other end of the fourth resistor is grounded, one end of the fourth capacitor and the output voltage detection terminal of the buck regulator chip are respectively connected to the common terminal of the third resistor and the second inductor, one end of the fifth capacitor, one end of the sixth capacitor and one end of the seventh capacitor are respectively connected to the common terminal of the rotation detection unit and the second inductor, the configuration terminal of the buck regulator chip and the other end of the fourth capacitor are respectively connected to the common terminal of the third resistor and the fourth resistor, the mode selection terminal of the buck regulator chip, the ground terminal of the buck regulator chip, the other end of the fifth capacitor, the other end of the sixth capacitor and the other end of the seventh capacitor are grounded.
8. The smart door lock according to claim 6, characterized in that, The motor drive circuit includes: a motor drive chip, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, and a thirteenth capacitor; wherein, One end of the fifth resistor is connected to the first motor control terminal of the main control chip; the other end of the fifth resistor and one end of the seventh resistor are respectively connected to the inverting input terminal of the motor drive chip; one end of the sixth resistor is connected to the second motor control terminal of the main control chip; the other end of the sixth resistor and one end of the eighth resistor are respectively connected to the forward rotation input terminal of the motor drive chip; the other end of the seventh resistor and the other end of the eighth resistor are grounded; the ground terminal of the motor drive chip is connected to one end of the ninth resistor; the other end of the ninth resistor and one end of the eighth capacitor are respectively connected to the analog-to-digital sampling terminal of the main control chip; the other end of the eighth capacitor is grounded; one end of the ninth capacitor and one end of the tenth resistor are respectively connected to the common ground terminal of the ninth resistor and the motor drive chip; the other ends of the ninth capacitor and the tenth resistor are grounded. The power supply terminal of the motor drive chip is connected to the power supply voltage. One end of the tenth capacitor, one end of the eleventh capacitor, and one end of the twelfth capacitor are respectively connected to the power supply terminal of the motor drive chip. The other ends of the tenth capacitor, the eleventh capacitor, and the twelfth capacitor are grounded. The common terminal of the first reverse output terminal and the second reverse output terminal of the motor drive chip is connected to the reverse control terminal of the motor. The common terminal of the first forward output terminal and the second forward output terminal of the motor drive chip is connected to the forward output terminal of the motor. One end of the thirteenth capacitor is connected to the common terminal of the first reverse output terminal and the second reverse output terminal of the motor drive chip. The other end of the thirteenth capacitor is connected to the common terminal of the first forward output terminal and the second forward output terminal of the motor drive chip.
9. The smart door lock according to claim 7, characterized in that, The Hall effect sensing unit includes a fourteenth capacitor and a sensor chip. The power supply terminal of the sensor chip is connected to one end of the fourteenth capacitor and the step-down circuit, respectively. The other end of the fourteenth capacitor and the ground terminal of the sensor chip are grounded. The output terminal of the sensor chip is connected to the control unit.
10. The smart door lock according to claim 5, characterized in that, The mechanical switch unit includes a single-pole double-throw limit switch. The common terminal of the single-pole double-throw limit switch is connected to the control unit. The normally closed terminal of the single-pole double-throw limit switch is left floating, and the normally open terminal of the single-pole double-throw limit switch is grounded.