Dual-drive intelligent door lock

Abstract

The present invention discloses a dual-drive intelligent door lock, which includes a door lock structure housing, a lock core, and a communication and drive circuit board disposed within the door lock structure. The communication and drive circuit board includes: a main motor drive circuit, a slave motor drive circuit, a main Bluetooth module, and a slave Bluetooth module. The main motor drive circuit is used to drive the door lock motor to rotate; the slave motor drive circuit is used to drive the door lock motor to rotate; the main Bluetooth module is used to drive the door lock motor to rotate through the main motor drive circuit to lock or unlock the door lock; the slave Bluetooth module is used to drive the door lock motor to rotate through the slave motor drive circuit to lock or unlock the door lock when the main Bluetooth module fails. By using a dual Bluetooth module to control a dual motor drive circuit to control the rotation of the door lock motor in a set of door lock hardware, on the one hand, the overall production cost of the door lock is reduced. On the other hand, the long-term normal operation of the intelligent door lock is ensured, and the frequency of failures of the intelligent door lock is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent door locks, and in particular to a dual-drive intelligent door lock. Background Art

[0002] An intelligent door lock is different from a traditional mechanical door lock. An intelligent door lock mainly uses electronic devices to control the rotation of a motor to control the telescopic movement of a lock core to lock or open a door. Since both the motor and the motor control device are electronic devices, during the use of the electronic devices, faults may occur, resulting in the door lock being unable to be locked or opened normally, which brings great inconvenience to users. In the prior art, mainly two sets of intelligent door locks are adopted to control the rotation of the motor simultaneously, so that when one set of intelligent door locks fails, the other set of intelligent door locks can be started to drive the motor to work. However, adopting two sets of intelligent door locks will bring the problem of high production cost of the intelligent door lock. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems in the related art to some extent. For this purpose, an object of the present invention is to propose a dual-drive intelligent door lock.

[0004] To achieve the above object, according to an embodiment of the present invention, a dual-drive intelligent door lock includes a door lock structure housing, a lock core, and a communication and drive circuit board disposed in the door lock structure, characterized in that the communication and drive circuit board includes:

[0005] A main motor drive circuit, which is connected to the door lock motor and is used to drive the door lock motor to rotate;

[0006] A slave motor drive circuit, which is connected to the door lock motor and is used to drive the door lock motor to rotate;

[0007] A main Bluetooth module, which is connected to the main motor drive circuit and is used to output a motor control signal to drive the door lock motor to rotate through the main motor drive circuit to lock or open the door lock;

[0008] A slave Bluetooth module, which is respectively connected to the main Bluetooth module and the slave motor drive circuit and is used to output a motor control signal when the main Bluetooth module fails to drive the door lock motor to rotate through the slave motor drive circuit to lock or open the door lock.

[0009] Further, according to an embodiment of the present invention, the main motor drive circuit includes:

[0010] The main drive circuit, the main drive circuit includes a main drive chip and a main chip peripheral circuit, the main drive chip is respectively connected to the main Bluetooth module and the door lock motor, and the main drive circuit is used to convert the control signal output by the main Bluetooth module into a first motor drive signal;

[0011] The main drive shutdown circuit, the main drive shutdown circuit is connected to the ground terminal of the main drive chip and the reference ground, and the main drive shutdown circuit is used to control the on-off between the ground terminal of the main drive chip and the reference ground, so as to drive the door lock motor to rotate or stop rotating through the main drive chip.

[0012] Further, according to an embodiment of the present invention, the slave motor drive circuit includes:

[0013] The slave drive circuit, the slave drive circuit includes a slave drive chip and a slave chip peripheral circuit, the slave drive chip is respectively connected to the slave Bluetooth module and the door lock motor, and the slave drive circuit is used to convert the control signal output by the slave Bluetooth module into a second motor drive signal;

[0014] The slave drive shutdown circuit, the slave drive shutdown circuit is connected to the ground terminal of the slave drive chip and the reference ground, and the slave drive shutdown circuit is used to control the on-off between the ground terminal of the slave drive chip and the reference ground, so as to drive the door lock motor to rotate or stop rotating through the slave drive chip.

[0015] Further, according to an embodiment of the present invention, the communication and drive circuit board further includes a dual-power supply circuit, the dual-power supply circuit is respectively connected to the main motor drive circuit, the slave motor drive circuit, the main Bluetooth module and the slave Bluetooth module, and is used to supply power to the main motor drive circuit, the slave motor drive circuit, the main Bluetooth module and the slave Bluetooth module; wherein, the dual-power supply circuit includes:

[0016] The first power supply circuit, the first power supply circuit is used to provide a first power supply;

[0017] The second power supply circuit, the second power supply circuit is used to provide a second power supply;

[0018] The power supply selection circuit, the power supply selection circuit is respectively connected to the first power supply circuit and the second power supply circuit, and the power supply selection circuit is used to select the first power supply or the second power supply to supply power to the main motor drive circuit, the slave motor drive circuit, the main Bluetooth module and the slave Bluetooth module.

[0019] Further, according to an embodiment of the present invention, the power supply selection circuit includes: a power supply startup circuit, the power supply startup circuit includes a startup circuit and a conduction circuit, an input end of the startup circuit is connected to an output end of the first power supply, and an output end of the startup circuit is respectively connected to the main motor drive circuit, the slave motor drive circuit, the main Bluetooth module, and the slave Bluetooth module;

[0020] An input end of the conduction circuit is respectively connected to an output end of the first power supply and an output end of the second power supply circuit, and the input end of the conduction circuit is respectively connected to the main motor drive circuit, the slave motor drive circuit, the main Bluetooth module, and the slave Bluetooth module.

[0021] Further, according to an embodiment of the present invention, the communication and drive circuit board further includes a capacitor power supply circuit, the capacitor power supply circuit is respectively connected to the dual power supply circuit and the remote wireless communication module, and is used to supply power to the remote wireless communication module.

[0022] Further, according to an embodiment of the present invention, the capacitor power supply circuit includes:

[0023] A main power supply circuit, the main power supply circuit is connected to the dual power supply circuit, and is used to convert the power supply voltage output by the dual power supply circuit into a stable first power supply;

[0024] A capacitor circuit, the capacitor circuit includes a battery capacitor, one end of the battery capacitor is connected to an output end of the first power supply of the main power supply circuit, and the other end of the battery capacitor is connected to a reference ground.

[0025] Further, according to an embodiment of the present invention, the capacitor circuit further includes: a diode D200, the battery capacitor is connected to the main power supply circuit through the diode D200, wherein an anode of the diode is connected to the main power supply circuit, and a cathode of the diode is connected to the one end of the battery capacitor.

[0026] Further, according to an embodiment of the present invention, the slave Bluetooth module includes:

[0027] A Bluetooth transceiver antenna, the Bluetooth transceiver antenna is connected to the slave Bluetooth module, and the Bluetooth transceiver antenna is used to receive and transmit Bluetooth wireless information input and output by the slave Bluetooth module;

[0028] A detachment detection circuit, the detachment detection circuit is respectively connected to the slave Bluetooth module and the Bluetooth transceiver antenna, and the detachment detection circuit is used to detect whether the Bluetooth transceiver antenna is detached.

[0029] Further, according to an embodiment of the present invention, the dropout detection circuit includes: an inductor L809 and a resistor R810. One end of the resistor R810 is connected to the power supply, the other end of the resistor R810 is connected to one end of the inductor L809, the other end of the inductor L809 is connected to one end of the Bluetooth transceiver antenna, the other end of the Bluetooth transceiver antenna is connected to the reference ground, and the common end of the inductor L809 and the resistor R810 is connected to the slave Bluetooth module.

[0030] In the embodiment of the present invention, in a set of door lock devices, a dual Bluetooth module is adopted to separately control a dual-motor drive circuit to control the rotation of the door lock motor to unlock. On the one hand, the overall production cost of the door lock is reduced. On the other hand, when one of the Bluetooth modules fails and cannot drive the door lock motor to rotate for unlocking or locking operations, the other Bluetooth module and the motor drive circuit can drive the door lock motor 13 to rotate for unlocking or locking, ensuring the long-term normal operation of the intelligent door lock and reducing the frequency of failures of the intelligent door lock. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a block diagram of a dual-drive intelligent door lock provided by an embodiment of the present invention;

[0032] Figure 2 It is a block diagram of a communication and drive circuit board provided by an embodiment of the present invention;

[0033] Figure 3 It is a main motor drive circuit diagram provided by an embodiment of the present invention;

[0034] Figure 4 It is a slave motor drive circuit diagram provided by an embodiment of the present invention;

[0035] Figure 5 It is a block diagram of a dual-power supply circuit provided by an embodiment of the present invention;

[0036] Figure 6 It is a power supply selection circuit diagram provided by an embodiment of the present invention;

[0037] Figure 7 It is a first power supply circuit diagram provided by an embodiment of the present invention;

[0038] Figure 8 It is a second power supply circuit diagram provided by an embodiment of the present invention;

[0039] Figure 9 It is a block diagram of a capacitor power supply circuit provided by an embodiment of the present invention;

[0040] Figure 10 It is a capacitor power supply circuit diagram provided by an embodiment of the present invention;

[0041] Figure 11Block diagram of the antenna detachment detection circuit provided by the embodiment of the present invention;

[0042] Figure 12 Circuit diagram of the antenna detachment detection circuit provided by the embodiment of the present invention;

[0043] Figure 13 Installation structure diagram of the Bluetooth transceiver antenna provided by the embodiment of the present invention.

[0044] Reference numerals:

[0045] Main Bluetooth module 10;

[0046] Slave Bluetooth module 20;

[0047] Slave Bluetooth chip 201;

[0048] Slave Bluetooth filter circuit 202;

[0049] Detachment detection circuit 203;

[0050] Antenna interface 204;

[0051] Grounding conductive housing 2041;

[0052] Bluetooth transceiver signal line 2042;

[0053] Bluetooth transceiver antenna 205;

[0054] Antenna ground wire 2051;

[0055] Antenna ground housing 2052;

[0056] WIFI module 30;

[0057] GSM module 40;

[0058] Audio power amplifier 50;

[0059] Gravity sensor 60;

[0060] Fingerprint module 70;

[0061] Door lock infrared alignment detection circuit 80;

[0062] Door opening and closing state detection circuit 90;

[0063] Main motor drive circuit 11;

[0064] Main drive circuit 1101;

[0065] Main drive shutdown circuit 1102;

[0066] Motor fault detection circuit 1103;

[0067] From the motor drive circuit 12;

[0068] From the drive circuit 1201;

[0069] From the drive-off circuit 1202;

[0070] From the motor fault detection circuit 1203;

[0071] The door lock motor 13;

[0072] The speaker 14;

[0073] The power switch control 15;

[0074] The main debugging interface 16;

[0075] The slave debugging interface 17;

[0076] The FLASH memory 18;

[0077] The EEPROM memory 19;

[0078] The dual power supply circuit 21;

[0079] The power interface 2101;

[0080] The first power supply circuit 2102;

[0081] The battery voltage detection circuit 21021;

[0082] The battery power supply circuit 21022;

[0083] The first battery 210221;

[0084] The second battery 210222;

[0085] The second power supply circuit 2103;

[0086] The power supply selection circuit 2104;

[0087] The power startup circuit 21041;

[0088] The power supply protection circuit 21042;

[0089] The capacitor power supply circuit 22;

[0090] The main power supply circuit 2201;

[0091] The capacitor circuit 2202.

[0092] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0093] To enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0094] Reference to "embodiment" herein means that a specific feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present invention. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0095] Refer to Figure 1 and Figure 2 An embodiment of the present invention provides a dual-drive intelligent door lock, including a door lock structure housing, a lock core, and a communication and drive circuit board disposed in the door lock structure housing. The communication and drive circuit board includes: a main motor drive circuit 11, a slave motor drive circuit 12, a main Bluetooth module 10, and a slave Bluetooth module 20. The main motor drive circuit 11 is connected to the door lock motor 13 and is used to drive the door lock motor 13 to rotate. When the user unlocks or locks the door, the rotation of the door lock motor 13 drives the lock core to move. The movement of the lock core can cooperate with the door lock structure housing to lock or unlock the door. Since the rotation of the door lock motor 13 requires a certain driving current, the main motor drive circuit 11 can convert the unlocking signal output by the main Bluetooth module 10 into motor drive to drive the door lock motor 13 to rotate and the lock core to move, thereby realizing the locking or unlocking operation of the door lock.

[0096] The slave motor drive circuit 12 is connected to the door lock motor 13 and is used to drive the door lock motor 13 to rotate. Similarly, the slave motor drive circuit 12 is also connected to the door lock motor 13. The slave motor drive circuit 12 can convert the unlocking signal output by the Bluetooth module 20 into motor drive to drive the door lock motor 13 to rotate, thereby realizing the locking or unlocking operation of the door lock.

[0097] The main Bluetooth module 10 is connected to the main motor drive circuit 11 and is used to output a motor control signal to drive the door lock motor 13 to rotate through the main motor drive circuit 11, so as to lock or unlock the door. In the implementation of the present invention, the main Bluetooth module 10 is the preferred lock control module. When the user selects to lock or unlock the door by Bluetooth, the main Bluetooth module 10 is first selected to control the door lock motor 13 to rotate through the main motor drive circuit 11, so as to implement the operation of locking or unlocking the door lock.

[0098] The slave Bluetooth module 20 is respectively connected to the main Bluetooth module 10 and the slave motor drive circuit 12 and is used to output a motor control signal to drive the door lock motor 13 to rotate through the slave motor drive circuit 12 to lock or unlock the door when the main Bluetooth module 10 fails. When the main Bluetooth module 10 fails, the main Bluetooth module 10 cannot output a control signal to control the rotation of the door lock motor 13 to lock or unlock the door. At this time, the slave Bluetooth module 20 receives the unlocking operation of the user by Bluetooth and outputs a control signal to the slave motor drive circuit, and controls the door lock motor 13 to rotate through the slave drive circuit to implement the operation of locking or unlocking the door lock.

[0099] In the embodiment of the present invention, in a set of door lock devices, a dual Bluetooth module is adopted to respectively control a dual motor drive circuit to control the rotation of the door lock motor 13 to unlock. On the one hand, the overall production cost of the door lock is reduced. On the other hand, when one of the Bluetooth modules fails and cannot drive the door lock motor 13 to rotate for unlocking or locking operations, the other Bluetooth module and the motor drive circuit can drive the door lock motor 13 to rotate for unlocking or locking, ensuring the long-term normal operation of the intelligent door lock and reducing the frequency of failures of the intelligent door lock.

[0100] Refer to Figure 3 In a further embodiment of the present invention, the main motor drive circuit 11 includes: a main drive circuit 1101. The main drive circuit 1101 includes a main drive chip U600 and a main chip peripheral circuit. The main drive chip U600 is respectively connected to the main Bluetooth module 10 and the door lock motor 13. The main drive circuit 1101 is used to convert the control signal output by the main Bluetooth module 10 into a first motor drive signal. Since the rotation of the door lock motor 13 requires a certain amount of current, the output signal of the main Bluetooth module 10 may not meet the driving requirements of the motor. The main drive chip U600 converts the output signal of the main Bluetooth module 10 into the driving current of the door lock motor 13 to drive the door lock motor 13 to rotate. By adopting a single-chip motor drive circuit to drive the rotation of the door lock motor 13, the number of electronic components of the motor drive circuit can be reduced, the volume of the motor drive circuit can be reduced, and the stability of the motor drive circuit can be increased. As Figure 3As shown in the figure, the working principle of the main motor drive circuit 11 is specifically as follows: The signal input terminals IN1 and IN2 of the main drive chip U600 are respectively connected to the main Bluetooth module 10 to receive the motor control signal output by the main Bluetooth module 10. The main drive chip U600 converts the motor control signal output by the main Bluetooth module 10 into a motor drive current, and outputs it to the door lock motor 13 through the signal output terminals OUT1 and OUT2 of the main drive chip U600 to drive the door lock motor 13 to rotate.

[0101] Refer to Figure 3 , further, in an embodiment of the present invention, the main motor drive circuit 11 further includes: a main drive shutdown circuit 1102. The main drive shutdown circuit 1102 is connected to the ground terminal of the main drive chip U600 and the reference ground. The main drive shutdown circuit 1102 is used to control the on / off between the ground terminal GND of the main drive chip and the reference ground, so as to control the rotation or stop of the door lock motor 13 through the main drive chip. As Figure 3 shown in the figure, the main drive shutdown circuit 1102 is arranged between the main drive chip U600 and the reference ground to control the connection between the drive circuit and the reference ground, thereby controlling the working state of the main drive chip U600. For example, when the ground terminal of the main drive chip U600 is connected to the reference ground, the main control drive chip U600 is in a normal working state, and the main control drive chip U600 can drive the door lock motor 13 to rotate under the action of the main Bluetooth module 10; when the ground terminal of the main drive chip U600 is disconnected from the reference ground, the main control drive chip U600 is in a stopped working state, and thus cannot drive the door lock motor 13 to rotate under the action of the main Bluetooth module 10.

[0102] That is, in the embodiment of the present invention, by controlling whether the main drive chip is grounded through the main drive shutdown circuit 1102, the working state of the main drive chip can be set. When it is necessary to drive the door lock motor 13 to rotate through the main drive chip U600, the ground terminal GND of the main drive chip U600 can be connected to the reference ground; when it is not necessary to drive the door lock motor 13 to rotate through the main drive chip U600, the connection between the ground terminal of the main drive chip and the reference ground can be disconnected, so as to maintain the mutual independence of the main drive circuit 1101 and the slave drive circuit and avoid interference with the slave drive circuit.

[0103] Refer to Figure 4 , similarly, the slave motor drive circuit 12 also includes a slave drive circuit 1201 and a slave drive shutdown circuit 1202. Their circuit connection relationships are the same as those of the main motor drive circuit 11, and their functions are the same. For the sake of simplicity, they will not be repeated here.

[0104] Refer to Figure 3, Further, in an embodiment of the present invention, the main motor drive circuit 11 further includes: a motor fault detection circuit 1103. The motor fault detection circuit 1103 includes: a resistor R610, a resistor R611, a resistor R612, and a resistor R613. One end of the resistor R610 is connected to the positive output terminal OUT1 of the main drive chip U600. The other end of the resistor R610 is connected to one end of the resistor R611. The other end of the resistor R611 is connected to the reference ground. The common terminal of the resistor R610 and the resistor R611 is connected to the main Bluetooth module 10 and / or the slave Bluetooth module 20. One end of the resistor R613 is connected to the negative output terminal OUT2 of the main drive chip U600. The other end of the resistor R613 is connected to one end of the resistor R612. The other end of the resistor R612 is connected to the reference ground. The common terminal of the resistor R613 and the resistor R612 is connected to the main Bluetooth module 10 and / or the slave Bluetooth module 20. The resistor R610 and the resistor R611 form a voltage division circuit, which collects and divides the voltage at one end of the main drive chip and then transmits it to the main Bluetooth module 10 and / or the slave Bluetooth module 20. Similarly, the resistor R612 and the resistor R613 also form a voltage division circuit, which collects and divides the voltage at the other end of the main drive chip and then transmits it to the main Bluetooth module 10 and / or the slave Bluetooth module 20. By detecting the output voltage of the main drive chip through the main Bluetooth module 10 and / or the slave Bluetooth module 20, it can be determined whether there is a short circuit or a fault problem with the door lock motor 13, so as to assist in the maintenance of the door lock motor 13.

[0105] Similarly, referring to Figure 4 , the slave motor drive circuit 12 also includes a slave motor fault detection circuit 1203. The slave motor fault detection circuit 1203 includes a resistor R607 and a resistor R608. The positive output terminal of the slave drive chip U601 is connected to the positive output terminal of the main drive chip U600 through the resistor R607. The negative output terminal of the slave drive chip U601 is connected to the negative output terminal of the main drive chip U600 through the resistor R608. The fault detection principle is the same as that of the above-mentioned motor fault detection circuit 1103.

[0106] More specifically, referring to Figure 3 and Figure 4, the common terminal of resistor R610 and resistor R611 is used to detect the level state of the power supply input terminal of the unlocking motor when the switch lock is detected. When the motor drive chip U600 is damaged due to some reason, resulting in a short circuit between the positive and negative poles of the drive chip output terminal and the ground of the U600 chip, the common terminal of resistor R610 and resistor R611, that is, the detection terminal, is at a low level, and the detection terminal is at a high level during normal unlocking. At this time, the main Bluetooth module 10 cuts off the connection between the ground of the motor drive chip U600 and the reference ground by controlling the N-MOS transistor Q600, so that the positive and negative poles of the U600 drive chip output terminal are not connected to the reference ground. Then the main Bluetooth module 10 notifies the slave Bluetooth module 20 to control the slave motor drive chip U601 to drive the motor to unlock, ensuring that the motor can still be unlocked normally when one of the two motor drive chips is damaged.

[0107] Refer to Figure 1 and Figure 5 , Further, in an embodiment of the present invention, the communication and drive circuit board further includes a dual-power supply circuit 21. The dual-power supply circuit 21 is respectively connected to the main motor drive circuit 11, the slave motor drive circuit 12, the main Bluetooth module 10, and the slave Bluetooth module 20 to supply power to the main motor drive circuit 11, the slave motor drive circuit 12, the main Bluetooth module 10, and the slave Bluetooth module 20.

[0108] As Figure 5 shown in

[0109] In an embodiment of the present invention, the dual-power supply circuit 21 includes: a first power supply circuit 2102, a second power supply circuit 2103, and a power supply selection circuit 2104. The first power supply circuit 2102 is used to provide a first power supply; that is, the first power supply can be introduced through the first power supply circuit 2102 to supply power to each module including the main motor drive circuit 11, the slave motor drive circuit 12, the main Bluetooth module 10, and the slave Bluetooth module 20.

[0110] The power supply selection circuit 2104 is respectively connected to the first power supply circuit 2102 and the second power supply circuit 2103. The power supply selection circuit 2104 is used to select the first power supply or the second power supply to supply power to the main motor drive circuit 11, the slave motor drive circuit 12, the main Bluetooth module 10, and the slave Bluetooth module 20. Since the first power supply introduced through the first power supply circuit 2102 and the second power supply introduced through the second power supply circuit 2103 are two independent DC power supply circuits respectively, the power supply selection circuit 2104 can select one of the two independent DC power supply circuits as the power supply. In an embodiment of the present invention, the second power supply circuit 2103 is an external power supply circuit. When an external power supply is connected, the power supply selection circuit 2104 preferentially selects the external power supply to supply power to each circuit module. When no external power supply is connected, the power supply selection circuit 2104 selects the internal battery as the power supply.

[0111] In the embodiment of the present invention, the dual power supply circuit 21 provides two independent dual-channel power supplies for each circuit module of the intelligent door lock. After one of the power supplies fails to supply power, the other power supply can be enabled to supply power to the intelligent door lock, ensuring the long-term normal operation of the intelligent door lock and reducing the failures of the intelligent door lock caused by power supply.

[0112] Refer to Figure 6 Further, in an embodiment of the present invention, the power supply selection circuit 2104 includes: a power supply startup circuit 21041. The power supply startup circuit 21041 includes a startup circuit 210411 and a conduction circuit 210412. The input end of the startup circuit 210411 is connected to the output end of the first power supply VBAT_M. The output end of the startup circuit 210411 is respectively connected to the main motor drive circuit, the slave motor drive circuit, the main Bluetooth module, and the slave Bluetooth module.

[0113] The input end of the conduction circuit 210412 is respectively connected to the output end of the first power supply VBAT_M and the output end of the second power supply VBUS_4V power supply circuit. The input end of the conduction circuit is respectively connected to the main motor drive circuit, the slave motor drive circuit, the main Bluetooth module, and the slave Bluetooth module.

[0114] Refer to Figure 6, Further, in an embodiment of the present invention, the startup circuit 210411 includes a startup diode D102, and the conduction circuit 210412 includes a first MOS transistor Q100, a resistor R102, and a resistor R103. The anode of the startup diode D102 is connected to the output terminal of the first power supply VBAT_M, and the cathode of the startup diode D102 is connected to the main motor drive circuit, the slave motor drive circuit, the main Bluetooth module, and the slave Bluetooth module (each circuit module of the smart door lock). The drain of the first MOS transistor Q100 is connected to the output terminal of the first power supply VBAT_M, the source of the first MOS transistor Q100 is connected to the cathode of the startup diode D102, the gate of the first MOS transistor Q100 is connected to one end of the resistor R102, the other end of the resistor R102 is connected to one end of the resistor R103, the other end of the resistor R103 is connected to a reference, and the common terminal of the resistor R102 and the resistor R103 is connected to the output terminal of the second power supply VBUS_4V.

[0115] As Figure 6As shown in the figure, the specific working principle of the power supply startup circuit 21041 is as follows: When there is a power supply output at the output terminal of the first power supply VBAT_M, the first power supply VBAT_M acts on the anode of the startup diode D102, causing the startup diode D102 to conduct. When the startup diode D102 conducts, the source of the first MOS transistor Q100 is at a high-level voltage. And since the first MOS transistor Q100 is a P-channel MOS transistor, the gate of the first MOS transistor Q100 is connected to the reference through the resistor R102 and the resistor R103. A conduction voltage appears between the source and the gate of the first MOS transistor Q100, causing conduction between the source and the drain of the first MOS transistor Q100. The first MOS transistor Q100 directly outputs the first power supply VBAT_M. Due to the conduction between the source and the drain of the first MOS transistor Q100, the voltage difference across the startup diode D102 rapidly decreases. At this time, the startup diode D102 turns off due to the too small voltage difference between the anode and the cathode. The startup diode D102 serves as the startup conduction function of the first power supply VBAT_M. When the first power supply VBAT_M is output through the first MOS transistor Q100, the startup diode D102 turns off, avoiding the power consumption of the startup diode D102 and reducing the power damage of the startup diode D102. When there is a power supply output at the output terminal of the second power supply VBUS_4V, since the gate of the first MOS transistor Q100 is connected to the input terminal of the output terminal of the second power supply VBUS_4V through the resistor R102, a high-level voltage appears at the gate of the first MOS transistor Q100. At this time, the conduction condition is not satisfied between the gate and the source of the first MOS transistor Q100, and the first MOS transistor Q100 turns off. At this time, the first power supply VBAT_M stops outputting. And the current at the output terminal of the second power supply VBUS_4V is directly output to each circuit module of the smart door lock to supply power to each circuit module of the smart door lock.

[0116] In the embodiment of the present invention, the power supply startup circuit 21041 is constituted by the startup diode D102, the first MOS transistor Q100, the resistor R102, and the resistor R103 to selectively output the first power supply VBAT_M and the second power supply VBUS_4V. The circuit is simple to use and has a low production cost.

[0117] Refer to Figure 6Further, in one embodiment of the present invention, the power startup circuit 21041 further includes a diode D103, the anode of the diode D103 is connected to the output end of the second power supply VBUS_4V, and the cathode of the diode D103 is connected to the cathode of the startup diode D102. The current of the output end VBUS_4V of the second power supply VBUS_4V is directly output to each circuit module of the smart door lock through the diode D103, and the circuit modules of the smart door lock are powered. Due to the unidirectional conductivity of the diode D103, the backflow of the output power is prevented.

[0118] See also Figure 6 , further, in one embodiment of the present invention, the power startup circuit 21041 also includes: a second MOS transistor Q101, the gate of the second MOS transistor Q101 is connected to the gate of the first MOS transistor Q100, the source of the second MOS transistor Q101 is connected to the source of the first MOS transistor Q100, and the drain of the second MOS transistor Q101 is connected to the drain of the first MOS transistor Q100. Specifically, by connecting the second MOS transistor Q101 and the first MOS transistor Q100 in parallel, the current output by the first power supply VBAT_M can be increased to prevent the first MOS transistor from being burned when overcurrent occurs. It should be noted that in other embodiments of the present invention, multiple second MOS transistors Q101 can be connected in parallel. To increase the current output by the first power supply VBAT_M. And the second MOS transistor Q101 is also a P-type MOS transistor. In the embodiment of the present invention, the first MOS transistor Q100 and the second MOS transistor Q101 are MOS transistors of the same model. In this way, the first MOS transistor Q100 and the second MOS transistor Q101 can be turned on at the same time, and the first power supply VBAT_M is directly output to provide power supply for the smart door lock.

[0119] See also Figure 6 Furthermore, in one embodiment of the present invention, the power supply selection circuit 40 also includes: a power supply protection circuit 21042, the power supply protection circuit 21042 includes a first fuse F100, and the cathode of the start diode D102 is connected to the main motor drive circuit, the slave motor drive circuit, the main Bluetooth module and the slave Bluetooth module (each circuit module of the smart door lock) through the first fuse F100. Since the first fuse F100 has the characteristic of overcurrent burning, the first fuse F100 can burn out when the output current is too large, thereby avoiding overheating of the circuit board due to excessive current caused by short circuit.

[0120] See also Figure 6, Further, in an embodiment of the present invention, the power supply protection circuit 21042 further includes a second fuse F101. The cathode of the start diode D102 is connected to each standby circuit module of the intelligent door lock through the second fuse F101. By providing the second fuse F101 in parallel with the first fuse F100, the output end of the second fuse F101 serves as the standby power output end to supply power to each standby circuit module of the intelligent door lock. After the first fuse F100 is burned out, power can be supplied to each standby circuit module of the intelligent door lock through the second fuse F101, and the door can be unlocked through each standby circuit. Adding the second fuse F101 can provide double insurance for the power supply of the intelligent door lock. For example, the main unlocking module of the intelligent door lock can be powered by the first fuse F100 to ensure the normal operation of the intelligent door lock, and the auxiliary unlocking module (standby circuit module) of the intelligent door lock can be powered by the second fuse F101. When the main unlocking module fails, the auxiliary unlocking module can assist the user to continue unlocking, ensuring the stability of power supply and unlocking of the intelligent door lock. Improve the user experience.

[0121] Refer to Figure 7 , Further, in an embodiment of the present invention, the first power supply circuit 2102 includes: a battery power supply circuit 21022, and the battery power supply circuit 21022 includes a first battery 210221. The first battery 210221 is connected to the power supply selection circuit 40 to provide a first power supply VBAT_M. Through the first battery 210221, the first power supply VBAT_M can be provided. As Figure 7 shown, a plurality of filter capacitors C100 - C102 are connected in parallel at the output end of the first battery 210221. Through the plurality of filter capacitors C100 - C102, the output power voltage of the first battery 210221 can be further filtered to provide a more stable DC power supply voltage. In another embodiment of the present invention, a TVS diode can also be connected in parallel at the output end of the first battery 210221. When there is static electricity or high voltage externally, the TVS diode discharges the energy to the ground, thereby ensuring that the subsequent circuit is not burned out.

[0122] Refer to Figure 7 , Further, in an embodiment of the present invention, the battery power supply circuit 21022 further includes a second battery 210222. The second battery 210222 is connected in series with the first battery 210221 and connected to the power supply selection circuit 40 to provide the first power supply. Through the two batteries, the stability of the power supply of the first power supply and more power supply can be further ensured, ensuring the long-term stable power supply of the intelligent door lock.

[0123] Refer to Figure 7, Further, in an embodiment of the present invention, the first power supply circuit 2102 further includes a battery voltage detection circuit 21021. The battery voltage detection circuit 21021 is respectively connected to the input terminal of the first power supply VBAT_M and the controller, and is used to detect the voltage of the first power supply VBAT_M. As Figure 7 shown in, the battery voltage detection circuit 21021 includes a resistor R100 and a resistor R101. One end of the resistor R100 is connected to the power output terminal VBAT_M of the battery, the other end of the resistor R100 is connected to one end of the resistor R101, the other end of the resistor R101 is connected to the reference ground, and the common end of the resistor R100 and the resistor R101 is connected to the voltage detection terminal of the controller. Through the voltage division of the resistor R100 and the resistor R101, the output voltage of the battery can be fed back to the voltage detection terminal of the controller. The controller can obtain the power voltage of the first power supply VBAT_M output by the battery through the battery voltage detection circuit 21021. Since in the embodiment of the present invention, the first power supply is battery-powered, by obtaining the voltage of the first power supply VBAT_M, the battery power can be judged. When the power is insufficient, the user can be prompted to connect an external power supply to ensure normal power supply.

[0124] Refer to Figure 8 , Further, in an embodiment of the present invention, the second power supply circuit 2103 includes: a power chip U100 and a chip peripheral circuit. The chip peripheral circuit is connected to the power chip U100. The power chip U100 is used to convert the input power into a second power supply VBUS_4V. The power chip U100 outputs a set power voltage to supply power to each circuit module of the intelligent door lock. In an embodiment of the present invention, the second power supply circuit 2103 is a buck circuit to step down the external input power supply for output.

[0125] Refer to Figure 1 and Figure 9 , Further, in an embodiment of the present invention, the communication and drive circuit board further includes: a GSM module 40. The GSM module 40 is connected to the main Bluetooth module 10 and / or the slave Bluetooth module 20 and is used for wireless communication with the server. The GSM module 40 communicates with the remote server to receive the client signal of the user through the remote server, so as to realize the remote unlocking control of the client.

[0126] Refer to Figure 9, Further, in an embodiment of the present invention, the communication and drive circuit board further includes a capacitor power supply circuit 22. The capacitor power supply circuit 22 is respectively connected to the dual-power supply circuit 21 and the remote wireless communication module (such as the GSM module 40) for supplying power to the remote wireless communication module. Since the GSM module 40 requires a large current during communication, a general first-way power supply can use a No. 5 dry battery with a small output current, which is difficult to meet the power supply requirements of the GSM module 40 during communication. Through the capacitor power supply circuit 22 according to the energy storage characteristics of the battery capacitor, a large instantaneous current can be provided for the GSM module 40 to ensure the normal communication of the GSM module 40.

[0127] Refer to Figure 10 , in an embodiment of the present invention, the capacitor power supply circuit 22 includes: a main power supply circuit 2201 and a capacitor circuit 2202. The main power supply circuit 2201 is connected to the dual-power supply circuit 21 for converting the power supply voltage output by the dual-power supply circuit 21 into a stable first power supply; through the main power supply circuit 2201, the power supply voltage output by the dual-power supply circuit 21 can be converted into the power supply voltage for the 2G / 3G or 4G module 40 to supply power to the 2G / 3G or 4G module 40.

[0128] The capacitor circuit 2202 includes a battery capacitor. One end of the battery capacitor is connected to the first power supply output terminal of the main power supply circuit 2201, and the other end of the battery capacitor is connected to the reference ground. By connecting the battery capacitor in parallel at the output terminal of the main power supply circuit 2201, the main power supply circuit 2201 can charge the battery capacitor. When the GSM module 40 communicates, the battery capacitor discharges to supply power to the GSM module 40. Since in the embodiment of the present invention, the battery capacitor is a large-capacity capacitor, the power requirement during GSM communication can be ensured.

[0129] In the embodiment of the present invention, by connecting a large capacitor in parallel at the output terminal of the main power supply circuit 2201, an instantaneous large current can be provided to supply power to the communication module, especially the mobile 2G / 3G or 4G module.

[0130] Refer to Figure 10 , further, in an embodiment of the present invention, the capacitor circuit 2202 further includes: a diode D200. The battery capacitor is connected to the power supply output terminal of the main power supply circuit 2201 through the diode D200. Among them, the anode of the diode D200 is connected to the power supply output terminal of the main power supply circuit 2201, and the cathode of the diode D200 is connected to one end of the battery capacitor. As Figure 10As shown, a diode D200 is provided between the main power supply circuit 2201 and the capacitor circuit 2202 to prevent the current on the battery capacitor from flowing back to the main power supply circuit 2201, ensuring the reliability of the circuit. At the same time, since there is a voltage drop across the diode D200 itself, connecting the diode D200 is to ensure that the charging voltage does not exceed the maximum charging voltage of the battery capacitor.

[0131] Refer to Figure 10 , further, in an embodiment of the present invention, the main power supply circuit 2201 includes: a power supply chip U203 and the peripheral circuit of the chip. The peripheral circuit of the chip is connected to the power supply chip U203. The input power supply voltage can be converted in terms of voltage value through the power supply chip U203. And by setting the peripheral circuit, the output voltage value of the power supply chip U203 can be set to provide a set power supply voltage for the 2G / 3G or 4G mobile communication module.

[0132] Refer to Figure 10 , further, in an embodiment of the present invention, the peripheral circuit of the chip further includes: a resistor R206 and a resistor R208. One end of the resistor R206 is connected to the voltage output terminal VOUT of the power supply chip U203, the other end of the resistor R206 is connected to the voltage adjustment terminal ADJ of the power supply chip, one end of the resistor R208 is connected to the other end of the resistor R206, and the other end of the resistor R208 is connected to the reference ground. After dividing the output voltage of the power supply chip by the resistor R206 and the resistor R208, it is fed back to the voltage adjustment terminal ADJ of the power supply chip, and the output voltage of the power supply chip is adjusted through the voltage adjustment terminal ADJ. By changing the resistance values of the resistor R206 and the resistor R208, the output voltage of the power supply chip can be adjusted to meet the voltage requirements of the 2G / 3G or 4G mobile communication module.

[0133] Refer to Figure 10 , further, according to an embodiment of the present invention, the peripheral circuit of the chip further includes: a capacitor C229. One end of the capacitor C229 is connected to the voltage adjustment terminal of the power supply chip U203, and the other end of the capacitor C229 is connected to the reference ground. By connecting the capacitor C229 in parallel to the voltage adjustment terminal of the power supply chip, the feedback voltage of the voltage adjustment terminal VOUT can be made a stable value, ensuring the stability of the output voltage of the power supply chip U203; it can also filter out the radio frequency interference signals introduced from the output terminal of the chip U203 and the circuit, so that the power supply input to the 2G and other mobile communication modules is an interference-free power supply, ensuring that the 2G and other mobile communication modules are not interfered.

[0134] Refer to Figure 10, Further, in an embodiment of the present invention, the peripheral circuit of the chip further includes: a capacitor C226. One end of the capacitor C226 is connected to the voltage output terminal VOUT of the power supply chip U203, and the other end of the capacitor C226 is connected to the reference ground. Connecting the capacitor C226 in parallel to the output terminal VOUT of the power supply chip can make the voltage of the output terminal VOUT a stable value, further ensuring the stability of the output voltage of the power supply chip; it can also filter out the radio frequency interference signals introduced from the output terminal of the chip U203 and the circuit, so that the power supply input to the 2G and other mobile communication modules is an interference-free power supply, ensuring that the 2G and other mobile communication modules are not interfered.

[0135] Refer to Figure 11 , Further, in an embodiment of the present invention, the slave Bluetooth module 20 includes: a Bluetooth transceiver antenna 205 and a detachment detection circuit 203. The Bluetooth transceiver antenna 205 is connected to the slave Bluetooth module 20, and the Bluetooth transceiver antenna 205 is used to transmit and receive Bluetooth wireless signals input and output by the slave Bluetooth module 20; the detachment detection circuit 203 is respectively connected to the slave Bluetooth module 20 and the Bluetooth transceiver antenna 205, and the detachment detection circuit is used to detect whether the Bluetooth transceiver antenna 205 is detached. As Figure 11 shown, in the embodiment of the present invention, the Bluetooth transceiver antenna 205 is detachably connected to the Bluetooth module through the antenna interface 204. During use, the Bluetooth transceiver antenna 205 may fall off from the antenna interface 204, resulting in the inability to transmit and receive signals through the Bluetooth transceiver antenna 205.

[0136] The antenna detachment detection circuit 203 provided by the embodiment of the present invention detects the installation state of the Bluetooth antenna and transmits the installation state of the Bluetooth antenna to the Bluetooth module. By detecting whether the Bluetooth antenna is detached, when it is detected that the Bluetooth antenna is detached, the connection state of the Bluetooth antenna can be sent to the background server through other communication methods, so as to facilitate the supplier to obtain the state or detachment of the Bluetooth antenna. After the supplier obtains the relevant information through the background server, the after-sales personnel can be arranged to come to the door in time to repair the user's faulty product.

[0137] Refer to Figure 12 and Figure 13 , Further, in an embodiment of the present invention, the detachment detection circuit 203 includes: an inductor L809 and a resistor R810. One end of the resistor R810 is connected to the power supply VDD2V8, the other end of the resistor R810 is connected to one end of the inductor L809, the other end of the inductor L809 is connected to one end of the Bluetooth transceiver antenna 205, the other end of the Bluetooth transceiver antenna 205 is connected to the reference ground, and the common end of the inductor L809 and the resistor R810 is connected to the slave Bluetooth module 20.

[0138] As Figure 12 and Figure 13As shown in the figure, when the Bluetooth antenna is not detached, the inductor L809 is connected to the reference ground through the Bluetooth antenna, pulling down the level of the common terminal of the inductor L809 and the resistor R810. By obtaining that the level of the common terminal of the inductor L809 and the resistor R810 is low from the Bluetooth module 20, it can be obtained that the Bluetooth transceiver antenna 205 is not detached; when the Bluetooth antenna is detached, the connection between the common terminal of the inductor L809 and the Bluetooth transceiver antenna 205 and the reference ground is disconnected. At this time, the common terminal P030_MBTANT_DET detection terminal of the inductor L809 and the resistor R810 is at a high level. When the Bluetooth module 20 obtains that the P030_MBTANT_DET detection terminal is at a high level, it can detect that the Bluetooth transceiver antenna 205 has been detached.

[0139] It should be noted that the other end of the inductor L809 is connected to the RF output terminal of the Bluetooth module 20. Due to the 2.4GHZ RF signal output by the Bluetooth module 20, the inductor L809 plays a role in isolating the Bluetooth 2.4GHZ RF signal, avoiding the interference of the Bluetooth 2.4GHZ signal RF signal on the signal of the P030_MBTANT_DET detection terminal. After being isolated by the inductor L809, the 2.4GHZ RF signal output by the Bluetooth module 20 does not affect the normal detection of the Bluetooth transceiver antenna 205 by the antenna detection circuit 10. In the embodiment of the present invention, the inductor L809, the resistor R810 are connected to the Bluetooth transceiver antenna 205 and the Bluetooth module 20 to realize the detection of the Bluetooth transceiver antenna 205. By the level value at one end of the inductor L809, the installation state of the Bluetooth transceiver antenna 205 can be obtained, so as to detect whether the Bluetooth transceiver antenna 205 is detached, and transmit the level signal indicating whether the Bluetooth transceiver antenna 205 is detached to the Bluetooth module 20, so as to detect in real time whether the Bluetooth transceiver antenna 205 is detached through the Bluetooth module 20. The antenna detection circuit is simple to use, has a low production cost, and has a high detection reliability for the Bluetooth transceiver antenna 205.

[0140] The above are only embodiments of the present invention, but do not limit the patent scope of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing specific embodiments, or perform equivalent replacements for some of the technical features. Any equivalent structures directly or indirectly using the content of the specification and drawings of the present invention in other related technical fields are equally within the scope of the patent protection of the present invention.

[0141] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0142] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention without departing from the principles and purposes of the present invention.

Claims

1. A dual-drive intelligent door lock, comprising a door lock structure housing, a lock core, and a communication and drive circuit board disposed within the door lock structure, characterized in that, the communication and drive circuit board includes: a main motor drive circuit, which is connected to the door lock motor and is used to drive the door lock motor to rotate; a slave motor drive circuit, which is connected to the door lock motor and is used to drive the door lock motor to rotate; a main Bluetooth module, which is connected to the main motor drive circuit and is used to output a motor control signal to drive the door lock motor to rotate through the main motor drive circuit so as to lock or unlock the door lock; a slave Bluetooth module, which is respectively connected to the main Bluetooth module and the slave motor drive circuit and is used to output a motor control signal to drive the door lock motor to rotate through the slave motor drive circuit so as to lock or unlock the door lock when the main Bluetooth module fails.

2. The dual-drive intelligent door lock according to claim 1, characterized in that, the main motor drive circuit includes: a main drive circuit, which includes a main drive chip and a main chip peripheral circuit. The main drive chip is respectively connected to the main Bluetooth module and the door lock motor, and the main drive circuit is used to convert the control signal output by the main Bluetooth module into a first motor drive signal; a main drive shutdown circuit, which is connected to the ground terminal of the main drive chip and the reference ground. The main drive shutdown circuit is used to control the on / off between the ground terminal of the main drive chip and the reference ground so as to drive the door lock motor to rotate or stop rotating through the main drive chip.

3. The dual-drive intelligent door lock according to claim 1, characterized in that, the slave motor drive circuit includes: a slave drive circuit, which includes a slave drive chip and a slave chip peripheral circuit. The slave drive chip is respectively connected to the slave Bluetooth module and the door lock motor, and the slave drive circuit is used to convert the control signal output by the slave Bluetooth module into a second motor drive signal; a slave drive shutdown circuit, which is connected to the ground terminal of the slave drive chip and the reference ground. The slave drive shutdown circuit is used to control the on / off between the ground terminal of the slave drive chip and the reference ground so as to drive the door lock motor to rotate or stop rotating through the slave drive chip.

4. The dual-drive intelligent door lock according to claim 1, characterized in that, the communication and drive circuit board further includes a dual-power supply circuit, which is respectively connected to the main motor drive circuit, the slave motor drive circuit, the main Bluetooth module and the slave Bluetooth module to supply power to the main motor drive circuit, the slave motor drive circuit, the main Bluetooth module and the slave Bluetooth module; wherein, the dual-power supply circuit includes: a first power supply circuit, which is used to provide a first power supply; a second power supply circuit, which is used to provide a second power supply; A power supply selection circuit, which is respectively connected to the first power supply circuit and the second power supply circuit, and is used to select the first power supply or the second power supply to supply power to the main motor drive circuit, the slave motor drive circuit, the main Bluetooth module and the slave Bluetooth module.

5. The dual-drive intelligent door lock according to claim 4, wherein, the power supply selection circuit includes: a power supply startup circuit, and the power supply startup circuit includes a startup circuit and a conduction circuit. The input end of the startup circuit is connected to the output end of the first power supply, and the output end of the startup circuit is respectively connected to the main motor drive circuit, the slave motor drive circuit, the main Bluetooth module and the slave Bluetooth module; the input end of the conduction circuit is respectively connected to the output end of the first power supply and the output end of the second power supply circuit, and the input end of the conduction circuit is respectively connected to the main motor drive circuit, the slave motor drive circuit, the main Bluetooth module and the slave Bluetooth module.

6. The dual-drive intelligent door lock according to claim 4, wherein, the communication and drive circuit board further includes a capacitor power supply circuit, and the capacitor power supply circuit is respectively connected to the dual power supply circuit and the remote wireless communication module, and is used to supply power to the remote wireless communication module.

7. The dual-drive intelligent door lock according to claim 6, wherein, the capacitor power supply circuit includes: a main power supply circuit, which is connected to the dual power supply circuit and is used to convert the power supply voltage output by the dual power supply circuit into a stable first power supply; a capacitor circuit, and the capacitor circuit includes a battery capacitor. One end of the battery capacitor is connected to the output end of the first power supply of the main power supply circuit, and the other end of the battery capacitor is connected to the reference ground.

8. The dual-drive intelligent door lock according to claim 7, wherein, the capacitor circuit further includes: a diode (D200), and the battery capacitor is connected to the main power supply circuit through the diode (D200), wherein the anode of the diode is connected to the main power supply circuit, and the cathode of the diode is connected to the one end of the battery capacitor.

9. The dual-drive intelligent door lock according to claim 1, wherein, the slave Bluetooth module includes: a Bluetooth transceiver antenna, which is connected to the slave Bluetooth module and is used to receive and transmit Bluetooth wireless information input and output by the slave Bluetooth module; a detachment detection circuit, which is respectively connected to the slave Bluetooth module and the Bluetooth transceiver antenna, and is used to detect whether the Bluetooth transceiver antenna is detached.

10. The dual-drive intelligent door lock according to claim 9, wherein, The detachment detection circuit includes: an inductor (L809) and a resistor (R810). One end of the resistor (R810) is connected to the power supply, the other end of the resistor (R810) is connected to one end of the inductor (L809), the other end of the inductor (L809) is connected to one end of the Bluetooth transceiver antenna, the other end of the Bluetooth transceiver antenna is connected to the reference ground, and the common end of the inductor (L809) and the resistor (R810) is connected to the slave Bluetooth module.

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