WO2019076367A1 - Smart lock circuit and smart lock - Google Patents

Abstract

A smart lock circuit and a smart lock. The smart lock circuit comprises an NFC communication module (1) and a drive module (6), wherein the NFC communication module (1) is electrically connected to the drive module (6); the NFC communication module (1) comprises an NFC antenna (11); the NFC antenna (11) is used for collecting electric energy in a received NFC signal; the NFC communication module (1) is used for transmitting, to the drive module (6), the electric energy collected by the NFC antenna (11); and the drive module (6) is used for using the electric energy to drive a smart lock to execute locking and unblocking operations. The smart lock overcomes the defect that an existing smart lock needs to be powered by means of an external battery, gets rid of the limitation of the battery, and is convenient to use; and at the same time, since use of a battery and setting a battery charging circuit are not needed, the volume of the smart lock is reduced, the weight thereof is reduced, and the production cost thereof is reduced.

Description

Smart lock circuit and smart lock

The present application claims priority to Chinese Patent Application No. CN201710986603.7, filed on Oct. 20, 2017, and to Chinese Patent Application No. CN201721361887.2, filed on Oct. 20, 2017. This application cites the entire text of the above-mentioned Chinese patent application.

Technical field

The present invention relates to the field of wireless communication technologies, and in particular, to a smart lock circuit and a smart lock.

Background technique

As a smart home product that has emerged in recent years, smart lock has the characteristics of convenient use, high security and powerful functions. Most of the existing smart locks are powered by batteries, and then communicate with the user's mobile phone through Bluetooth or NFC (Near Field Communication) to verify the identity of the user and lock and unlock the smart lock.

However, existing smart locks can only be used for door locks due to problems such as size or power consumption. When applied to applications other than door locks, such as small personal cabinet locks, suitcase locks, and shared bicycle locks, many difficulties are encountered. Since this type of smart lock itself is small in size, it is difficult to have a built-in battery. Even if a built-in battery can be built, since the lock consumes a large amount of electric energy during operation, the battery is quickly exhausted, which may cause insufficient power supply. At the same time, the use of Bluetooth to unlock requires prior pairing, and is not suitable for sharing the use of smart locks, such as shared bicycle locks, so these problems greatly limit the application of smart locks outside the door lock. The existing smart lock products outside the door lock generally install the battery by increasing the volume of the lock, resulting in the product being neither beautiful nor convenient to use, and the user experience is not good.

Summary of the invention

The technical problem to be solved by the present invention is that in order to overcome the smart lock existing in the prior art, it is necessary to use a battery for power supply, and the smart lock with a small volume is prone to insufficient power supply, and is not aesthetically pleasing or convenient for a large-sized smart lock. Defects such as poor user experience, the purpose is to provide a smart lock circuit and smart lock.

The present invention solves the above technical problems by the following technical solutions:

The invention provides a smart lock circuit, and the smart lock circuit comprises an NFC communication module and a drive module;

The NFC communication module is electrically connected to the driving module;

The NFC communication module includes an NFC antenna, and the NFC antenna is configured to collect power in the received NFC signal;

The NFC communication module is configured to transmit power collected by the NFC antenna to the driving module;

The drive module is configured to perform an operation of locking and unlocking using a power-driven smart lock.

Preferably, the smart lock circuit further includes an energy management circuit;

The energy management circuit is electrically connected to the NFC communication module and the driving module, respectively;

The energy management circuit is configured to receive the electrical energy transmitted by the NFC communication module and transmit the received electrical energy to the driving module.

Preferably, the smart lock circuit further includes a rectifier circuit and a voltage stabilization circuit;

The rectifier circuit is electrically connected to the NFC communication module, the voltage stabilization circuit, and the energy management circuit, respectively;

The NFC communication module is configured to receive radio frequency energy transmitted by the NFC energy antenna and transmit the radio frequency energy to the rectifying circuit;

The rectifier circuit is configured to convert the RF energy into a first DC power and transmit the voltage to the voltage stabilizing circuit and the energy management circuit;

The voltage stabilizing circuit is configured to perform buck and voltage stabilization processing on the first DC power, convert into a second DC power, and supply power to the NFC communication module and the energy management circuit;

The energy management circuit is configured to transmit the first DC power to the driving module.

Preferably, the smart lock circuit further includes an energy storage module;

The energy management circuit is electrically connected to the energy storage module for transmitting the received first DC power to the energy storage module for charging.

Preferably, the energy management circuit is configured to cut off charging of the energy storage module when the energy storage module pulls the power collected by the NFC antenna to a first voltage threshold.

Preferably, the energy management circuit comprises a charging switch, the charging switch is electrically connected to the energy storage module, and the energy management circuit is further configured to control the turning on and off of the charging switch.

Preferably, the charging switch further includes a charging prohibition control end for forcibly turning off the charging switch.

Preferably, the energy management circuit includes a first voltage comparator;

The two input ends of the first voltage comparator respectively input a voltage of the first direct current power and the first voltage threshold, and an output end of the first voltage comparator is electrically connected to the charging switch, The first voltage comparator is configured to output an on signal to the charging switch when the voltage of the first direct current power is higher than the first voltage threshold.

Preferably, the energy storage module is configured to discharge to the energy management circuit;

The energy management circuit is further configured to transmit the discharged electrical energy of the energy storage module to the driving module.

Preferably, the energy management circuit further includes a discharge switch, the energy storage module is electrically connected to the driving module through the discharge switch, and the energy management circuit is further configured to control the conduction and the closing of the discharge switch. Broken.

Preferably, the response time of the charging switch is less than 10 μs, and/or the response time of the discharging switch is less than 10 μs.

Preferably, the energy management circuit further includes a second voltage comparator;

The two input ends of the second voltage comparator are respectively input to the energy storage voltage of the energy storage module and the second voltage threshold, and the output end of the second voltage comparator is electrically connected to the discharge switch, The two voltage comparators are configured to output a power supply alarm signal to the driving module through the discharging switch when the energy storage voltage of the energy storage module is lower than the second voltage threshold.

Preferably, the energy management circuit further includes a third voltage comparator;

The two input ends of the third voltage comparator are respectively input to the energy storage voltage of the energy storage module and the third voltage threshold, the third voltage threshold is smaller than the second voltage threshold, and the third voltage comparator is used And outputting a shutdown signal to the discharge switch when a stored voltage of the energy storage module is lower than the third voltage threshold.

Preferably, the smart lock circuit further includes a control module;

The control module is communicably connected to the NFC communication module, the energy management circuit, and the driving module, respectively;

The control module is configured to perform data transmission with the NFC communication module;

The control module is further configured to send a control instruction to the driving module;

The voltage stabilizing circuit is electrically connected to the control module, and supplies power to the control module by using the second direct current power.

Preferably, the control module is configured to perform user identity verification according to the received NFC signal.

Preferably, the driving module comprises a transaxle;

The transaxle includes a MOSFET or an IGBT.

Preferably, the NFC antenna comprises a separate energy antenna, a separate receiving antenna and a separate transmitting antenna; the energy antenna is used for collecting electrical energy in the received NFC signal;

The NFC communication module further includes a demodulation module, a modulation module, and an NFC controller, wherein the receiving antenna is electrically connected to the demodulation module, the transmitting antenna is electrically connected to the modulation module, and the NFC controller respectively The demodulation module and the modulation module are electrically connected;

The receiving antenna is configured to receive an NFC signal transmitted by an NFC card reader and send the signal to the demodulation module, and the demodulation module demodulates and transmits the demodulated data to the NFC controller;

The NFC controller is configured to transmit data to be transmitted to the modulation module according to a predetermined format, and after being modulated by the modulation module, send an NFC signal to the NFC card reader through the transmitting antenna.

Preferably, the NFC antenna comprises a separate energy antenna and a separate communication antenna; the energy antenna is configured to collect electrical energy in the received NFC signal;

The NFC communication module further includes a demodulation module, a modulation module, and an NFC controller, wherein the communication antenna is electrically connected to the demodulation module and the modulation module, respectively;

The communication antenna is configured to receive an NFC signal transmitted by an NFC card reader and send the signal to the demodulation module, and the demodulation module demodulates and transmits the demodulated data to the NFC controller;

The NFC controller is configured to transmit data to be transmitted to the modulation module according to a predetermined format, and after being modulated by the modulation module, send an NFC signal to the NFC card reader through the communication antenna.

Preferably, the NFC communication module further includes a data interface; the data interface is communicatively coupled to the control module.

Preferably, the rectifier circuit comprises a diode rectifier bridge, the diode of the diode rectifier bridge has a diode voltage drop of less than 1V when the on current is 20mA, and/or the voltage regulator circuit comprises a linear regulator or a switch. The voltage regulator has an output voltage ranging from 1.7V to 3.6V.

Preferably, the energy storage module comprises a storage capacitor; the storage capacitor has a capacitance value of 22 μF to 0.47F.

Preferably, the NFC communication module obtains at least 20 mW of electrical energy.

The invention also provides a smart lock, the smart lock comprising the above-mentioned smart lock circuit; the smart lock further comprises an action mechanism and a lock cylinder mechanism;

The driving module, the action mechanism and the lock cylinder mechanism are connected to each other in turn;

The driving module is configured to drive the action mechanism to drive the lock core mechanism to perform an operation of locking and unlocking.

Preferably, the action mechanism includes a motor and a motor shaft fixed to one side of the motor, and the motor shaft is provided with a thread;

The motor is electrically connected to the driving module of the smart lock circuit, and is configured to convert electrical energy provided by the driving module into kinetic energy to drive the motor shaft to rotate;

The lock cylinder mechanism includes a lock core seat and a lock core fixed to one side of the lock core seat;

The lock core seat is provided with a first opening, and a nut corresponding to the thread on the motor shaft is disposed inside the first opening;

The motor shaft is coupled to the lock cylinder housing through the first opening.

Preferably, the smart lock further includes a lock cylinder limiter;

The lock cylinder limiter is provided with a second opening, the lock core is inserted into the lock core limiter through the second opening, the second opening is larger than the lock core;

The lock cylinder limiter is for limiting the rotation of the lock cylinder, ensuring linear movement of the lock cylinder along the motor shaft direction, and does not exert a resistance to linear movement of the lock cylinder.

Preferably, the diameter of the second opening is 0.8 mm to 3 mm longer than the diameter of the lock cylinder.

Preferably, the smart lock further includes a base;

The motor and the lock cylinder limiter are both fixed to the base.

Preferably, the smart lock further includes a position sensor;

The position sensor includes a first conductive contact and a second conductive contact fixed to the base, and a third conductive contact fixed on the lock core seat;

The first conductive contact, the second conductive contact and the third conductive contact are arranged along the motor axis direction and are disposed on the same straight line;

The third conductive contact is disposed between the first conductive contact and the second conductive contact;

The third conductive contact follows the lock core for movement to contact the first conductive contact or the second conductive contact to form a current loop;

The smart lock circuit acquires a positional relationship between the lock core seat and the lock cylinder through the current loop.

Preferably, the first conductive contact is closer to the motor relative to the second conductive contact;

When the first conductive contact is in contact with the third conductive contact, the smart lock is in a locked state;

When the second conductive contact is in contact with the third conductive contact, the smart lock is in an unlocked state.

Preferably, the motor comprises a DC stepper motor or a DC non-stepping motor.

Preferably, the lock cylinder seat, the base and the lock cylinder limiter are made of metal material, plastic material and/or wood material.

The positive effects of the present invention are:

The invention obtains the electric energy in the NFC signal by using the NFC energy antenna in the NFC communication module, and then converts the obtained alternating current into direct current through the rectifying circuit to provide the driving module to work, and the driving module drives the action mechanism to drive the lock core to perform the action, thereby realizing The locking and unlocking operation of the lock core overcomes the defects that the existing smart lock needs to be powered by an external battery, and is free from the limitation of the battery, and is convenient to use; meanwhile, since the battery is not required and the battery charging circuit is set, The smart lock is reduced in size, weight is reduced, and production costs are reduced.

DRAWINGS

1 is a schematic diagram showing the circuit structure of a smart lock circuit according to Embodiment 1 of the present invention;

2 is a schematic diagram showing the circuit structure of a smart lock circuit according to Embodiment 2 of the present invention;

3 is a schematic circuit diagram of a smart lock circuit according to Embodiment 3 of the present invention;

4 is a schematic overall structural view of a smart lock according to Embodiment 4 of the present invention;

Figure 5 is a block diagram showing a top view of a smart lock according to Embodiment 4 of the present invention;

6 is a left side structural block diagram of a smart lock according to Embodiment 4 of the present invention;

Fig. 7 is a block diagram showing the front structure of a smart lock according to a fourth embodiment of the present invention.

Detailed ways

The invention is further illustrated by the following examples, which are not intended to limit the invention.

Example 1

As shown in FIG. 1, the smart lock circuit of the present invention comprises an NFC communication module 1, a rectifier circuit 2, a voltage stabilization circuit 3, an energy management circuit 4, an energy storage module 5, a drive module 6, and a control module 7.

The NFC communication module 1 includes an NFC antenna 11 for collecting radio frequency energy in a received NFC signal.

The NFC antenna 11 can collect more than 20 mW of electric energy in the NFC signal transmitted by the intelligent terminal having the NFC antenna.

NFC antenna 11 is provided in the interior of the inner or outer surface of the intelligent lock housing, as close as possible for an intelligent lock disposed at an outer surface, and a multi-turn coils, in an area 900mm ² -2500mm ^2.

The NFC communication module 1 further includes a data interface 12; the data interface 12 is communicatively coupled to the control module 7.

The rectifier circuit 2 is electrically connected to the NFC communication module 1, the voltage stabilization circuit 3, and the energy management circuit 4, respectively.

The rectifier circuit 2 is configured to receive the RF energy transmitted by the NFC communication module 1 and convert it into a first DC power, and transmit the same to the voltage stabilization circuit 3 and the energy management circuit 4. Wherein, the first direct current electrical energy is a direct current high voltage.

Specifically, the rectifier circuit 2 includes a diode rectifier bridge, and the diode of the diode rectifier bridge has a diode voltage drop of less than 1V when the on current is 20 mA.

The voltage stabilizing circuit 3 is configured to perform buck and voltage stabilization processing on the first DC power, convert it into a second DC power, and supply power to the NFC communication module 1 and the energy management circuit 4; wherein, the second DC power is DC low voltage.

Specifically, the voltage stabilizing circuit 3 includes a linear regulator or a switching regulator, and the output voltage of the voltage stabilizing circuit 3 ranges from 1.7V to 3.6V.

The energy management circuit 4 is configured to transmit the first direct current power to the driving module 6.

The energy management circuit 4 is electrically connected to the energy storage module 5 for transmitting the power collected by the NFC antenna 11 to the energy storage module 5 for charging.

Specifically, the energy management circuit 4 is configured to cut off charging of the energy storage module 5 when the energy storage module 5 pulls the power collected by the NFC antenna 11 to a first voltage threshold.

The energy management circuit 4 includes a charge switch 41, a discharge switch 42, a first voltage comparator 43, a second voltage comparator 44, and a third voltage comparator 45.

The charging switch 41 is electrically connected to the energy storage module 5, and the energy management circuit 4 is further configured to control the turning on and off of the charging switch 41.

The charging switch 41 includes a charge inhibiting control terminal 411 for forcibly turning off the charging switch 41.

The energy storage module 5 is configured to discharge the energy management circuit 4; the energy management circuit 4 is further configured to transmit the discharge energy of the energy storage module 5 to the driving module 6.

Specifically, the energy storage module 5 is electrically connected to the driving module 6 through the discharge switch 42. The energy management circuit 4 is further configured to control the on and off of the discharge switch 42.

In the specific implementation, the energy storage module 5 may preferably be a storage capacitor, and the capacitance value of the storage capacitor may be in the range of 22 μF to 0.47 F. The specific capacitance value may be selected according to actual needs, and the capacitance of the larger capacity may be More energy is stored, and the smoothing effect is better. However, when charging, the charging time is longer, and the user needs to wait longer. The withstand voltage of the energy storage capacitor is designed according to the energy collected by the NFC energy antenna, and generally needs to be 9V. In order to reduce the ESR (Equivalent Series Resistance) of the energy storage module 5 to improve the storage efficiency, the energy storage module 5 may be designed by using a plurality of capacitors in parallel. The response time of the charging switch 41 is less than 10 μs, and/or the response time of the discharging switch 42 is less than 10 μs.

Since the energy storage capacitor of the energy storage module 5 is large, the instantaneous current is extremely large, and the DC high voltage is pulled down in a short time, causing the input voltage of the voltage stabilization circuit 3 to drop sharply, thereby cutting off the voltage stabilization circuit 3 DC low voltage, thereby resetting the entire smart lock circuit; at the same time, the instantaneous excessive change of the collected DC high voltage will interfere with the reception and transmission of the NFC signal of the NFC communication module 1, so the energy management circuit 4 is required to monitor the change of the input DC high voltage, and manage The charging timing of the energy storage module 5.

Specifically, the energy management circuit 4 inputs the voltage of the first direct current power and the first voltage threshold respectively at the two input ends of the first voltage comparator 43, the output of the first voltage comparator The first voltage comparator 43 is configured to output an on signal to the charging switch 41 when the voltage of the first direct current power is higher than the first voltage threshold, otherwise A shutdown signal is output to the charging switch 41 such that the charging switch 41 is in an off state when the voltage of the first direct current power is not higher than the first voltage threshold.

The specific value of the first voltage threshold should generally be configured according to actual application requirements to meet different application requirements, but generally should be between 3.3V and 10V.

When the NFC communication module 1 receives and transmits the NFC signal through the NFC antenna 11, the energy management circuit 4 does not perform a charging operation on the energy storage module 5.

The energy management circuit 4 is also used to monitor the energy usage of the driving module 6, and ensure that the driving module 6 does not use the energy of the energy storage module 5, thereby causing the DC lock to be too low to cause the smart lock circuit to be reset. The energy management circuit 4 provides the control module 7 with a status indication of the state of charge of the energy storage module 5 and disconnects the drive module 6 if necessary.

Specifically, the energy management circuit 4 inputs the storage voltage and the second voltage threshold of the energy storage module 5 at the two input ends of the second voltage comparator 44, respectively, and the output of the second voltage comparator Electrically connected to the discharge switch 42 , the second voltage comparator 44 is configured to drive the discharge switch 42 to the drive when the energy storage voltage of the energy storage module 5 is lower than the second voltage threshold The module 6 outputs a power alarm signal and sends the power alarm signal to the control module 7. The control module 7 temporarily disables the drive module 6. After the power alarm signal is cancelled, the control module 7 controls the drive module 6 to resume normal operation.

The specific value of the second voltage threshold should generally be configured according to actual application requirements to meet different application requirements, but generally should be between 3.3V and 7V.

The two input ends of the third voltage comparator 45 are respectively input to the storage voltage of the energy storage module 5 and a third voltage threshold, the third voltage threshold is smaller than the second voltage threshold, the third voltage The comparator 45 is configured to output a shutdown signal to the discharge switch 42 when the energy storage voltage of the energy storage module 5 is lower than the third voltage threshold, and send the shutdown signal to the control module 7, the control module 7 will temporarily disable the drive module 6, and after the shutdown signal and the power alarm signal are cancelled, the control module 7 performs a reset operation on the drive module 6.

The second voltage threshold should be higher than the third voltage threshold, and the specific value of the third voltage threshold should generally be configured according to actual application requirements to meet different application requirements, but generally should be between 2.4V and 5V.

The control module 7 is communicably connected to the NFC communication module 1, the energy management circuit 4, and the driving module 6, respectively;

The control module 7 is configured to perform data transmission with the NFC communication module 1;

The control module 7 is further configured to send a control instruction to the driving module 6 to implement control of the driving module 6 by using a control instruction;

The voltage stabilizing circuit 3 is electrically connected to the control module 7 and supplies power to the control module 7 through the second direct current power.

The control module 7 is configured to obtain user identity verification information in the NFC signal sent by the received smart terminal through the NFC antenna, to verify the identity of the user.

The driving module 6 includes a driving bridge, and the driving bridge includes a MOSFET or an IGBT or the like for driving the smart lock to perform locking and unlocking operations according to the electrical energy input by the energy management circuit 4.

The working principle of the smart lock of this embodiment is as follows:

In this embodiment, the RF energy in the NFC signal sent by the intelligent terminal is collected by the NFC antenna 11 in the NFC communication module 1 and transmitted to the rectifier circuit 2 through the NFC communication module 1; the rectifier circuit 2 converts the AC power corresponding to the received RF energy. For DC high voltage, the DC high voltage is stepped down by the voltage stabilizing circuit 3, converted into a stable DC low voltage, and the NFC communication module 1, the control module 7 and the energy management circuit 4 are respectively supplied with power; meanwhile, the rectifier circuit 2 will be converted. The DC high voltage is transmitted to the energy management circuit 4 for charging and storing the energy storage module 5, and the energy management circuit 4 transmits the DC high voltage to the driving module 6, and the driving module 6 drives the smart lock to perform locking and unlocking. operating. The NFC signal is received and transmitted through the NFC antenna 11; the first voltage comparator 43 in the energy management circuit 4 is used to ensure the normal operation of the voltage stabilization circuit 3, and the second voltage comparator 44 and the third voltage comparator 45 are used. In order to ensure the normal operation of the drive module 6.

Example 2

As shown in FIG. 2, the difference between this embodiment and Embodiment 1 is:

The NFC antenna 11 of the embodiment includes an independent energy antenna 111, a separate receiving antenna 13, and a separate transmitting antenna 14; the NFC communication module further includes a demodulation module 15, a modulation module 16, and an NFC controller 17, The receiving antenna 13 is electrically connected to the demodulation module 15, the transmitting antenna 14 is electrically connected to the modulation module 16, and the NFC controller 17 is electrically connected to the demodulation module 15 and the modulation module 16, respectively. . The NFC communication module 1 may further include an NFC antenna interface. The energy antenna 111 is configured to collect electrical energy in the received NFC signal.

The receiving antenna 13 is configured to receive an NFC signal transmitted by an NFC card reader, and the demodulation module 15 demodulates and transmits the data to the NFC controller 17;

The NFC controller 17 transmits data to the modulation module 16 in a predetermined format, and is modulated by the modulation module 16 to transmit an NFC signal to the NFC reader through the transmit antenna 14.

Among them, the NFC card reader is a smart terminal (such as a mobile phone) having an NFC antenna.

The energy antenna 111, the receiving antenna 13 and the transmitting antenna 14 may be disposed on the inner, inner or outer surface of the outer casing of the smart lock, and should be disposed as close as possible to the outer surface of the smart lock, and have multiple coils, and the area is 900 mm ^{2 -} 2500 mm. ² inside.

The working principle of the smart lock of this embodiment is as follows:

In this embodiment, the RF energy in the NFC signal sent by the intelligent terminal is collected by the energy antenna 111 in the NFC communication module 1 and transmitted to the rectifier circuit 2 through the NFC communication module 1; the rectifier circuit 2 converts the AC power corresponding to the received RF energy. For DC high voltage, the DC high voltage is stepped down by the voltage stabilizing circuit 3, converted into a stable DC low voltage, and the NFC communication module 1, the control module 7 and the energy management circuit 4 are respectively supplied with power; meanwhile, the rectifier circuit 2 will be converted. The DC high voltage is transmitted to the energy management circuit 4 for charging and storing the energy storage module 5, and the energy management circuit 4 transmits the DC high voltage to the driving module 6, and the driving module 6 drives the smart lock to perform locking and unlocking. operating. Wherein, the NFC signal is received and transmitted through the independent receiving antenna 13 and the independent transmitting antenna 14, respectively; the first voltage comparator 43 in the energy management circuit 4 is used to ensure the normal operation of the voltage stabilizing circuit 3, and the second voltage comparator The 44 and third voltage comparators 45 are used to ensure proper operation of the drive module 6.

Example 3

As shown in FIG. 3, the difference between this embodiment and Embodiment 2 is:

The NFC antenna 11 of this embodiment includes an independent energy antenna 111 and an independent communication antenna 20, that is, an independent communication antenna 20 is used instead of the independent receiving antenna 13 and the independent transmitting antenna 14 in Embodiment 2 to implement an NFC signal. Receive and send.

Specifically, the communication antenna 20 is electrically connected to the demodulation module 15 and the modulation module 16. After the communication antenna 20 receives the NFC signal transmitted by the NFC card reader, the demodulation module 15 demodulates and transmits the demodulated data to the NFC controller 17;

The NFC controller 17 transmits data to the modulation module 16 in a predetermined format, and is modulated by the modulation module 16 to transmit an NFC signal to the NFC reader through the communication antenna 20.

Power antenna 111 and the communication antenna 20 may be disposed inside the housing, the inner or outer surface of the intelligent lock, for an as close to the outer surface of the smart lock is provided, and the multi-turn coils have, within the area of 900mm ² -2500mm ^2.

The working principle of the smart lock of this embodiment is as follows:

In this embodiment, the RF energy in the NFC signal sent by the intelligent terminal is collected by the energy antenna 111 in the NFC communication module 1 and transmitted to the rectifier circuit 2 through the NFC communication module 1; the rectifier circuit 2 converts the AC power corresponding to the received RF energy. For DC high voltage, the DC high voltage is stepped down by the voltage stabilizing circuit 3, converted into a stable DC low voltage, and the NFC communication module 1, the control module 7 and the energy management circuit 4 are respectively supplied with power; meanwhile, the rectifier circuit 2 will be converted. The DC high voltage is transmitted to the energy management circuit 4 for charging and storing the energy storage module 5, and the energy management circuit 4 transmits the DC high voltage to the driving module 6, and the driving module 6 drives the smart lock to perform locking and unlocking. operating. Wherein, the NFC signal is received and transmitted through the communication antenna 20 in the NFC antenna 11; the first voltage comparator 43 in the energy management circuit 4 is used to ensure the normal operation of the voltage stabilization circuit 3, and the second voltage comparator 44 and The third voltage comparator 45 is used to ensure normal operation of the drive module 6.

Example 4

As shown in FIG. 4, the smart lock of the present embodiment includes the smart lock circuit, the action mechanism 8, and the lock cylinder mechanism 9 of the first embodiment.

The drive module 6, the action mechanism 8, and the lock cylinder mechanism 9 of the smart lock circuit are sequentially connected to each other. The driving module 6 is configured to drive the action mechanism 8 to drive the lock cylinder mechanism 9 to perform an operation of locking and unlocking.

As shown in FIG. 4 to FIG. 7, specifically, the action mechanism 8 includes a motor 81 and a motor shaft 82 fixed to one side of the motor 81; the motor shaft 82 is provided with a thread.

The motor 81 includes a DC stepping motor or a DC non-stepping motor.

The motor 81 is connected to the driving module 6 of the smart lock circuit for converting electric energy provided by the driving module 6 into kinetic energy to drive the motor shaft 82 to rotate;

The lock cylinder mechanism 9 includes a lock core seat 91, a lock core 92 fixed to one side of the lock core seat 91, and a lock cylinder limiter 93;

The first core 911 is provided with a first opening 911. The first opening 911 is matched with the motor shaft 82. Specifically, the first opening 911 is disposed on the inner side of the motor shaft 82. The threaded mating nut; the motor shaft 82 is coupled to the lock cylinder block 91 through the first opening 911.

The motor shaft 82 is connected to the lock core housing 91 through the first opening 911, so as to drive the lock core seat 91 to move along the motor shaft 82.

The lock cylinder limiter 93 is provided with a second opening 931 through which the lock cylinder 92 is inserted in the lock cylinder limiter 93, and the second opening is larger than the Large lock cylinder;

Specifically, the diameter of the second opening 931 is longer than the diameter of the lock cylinder 92 by 0.8 mm to 3 mm.

The aperture of the second opening 931 is slightly larger than the lock cylinder 92 for ensuring linear movement of the lock cylinder 92 in the direction of the motor shaft 82 without applying resistance to the linear motion of the lock cylinder.

The smart lock further includes a base 10, and the motor 81 and the lock cylinder limiter 93 are both fixed on the base 10.

The lock core seat 91, the base 10 and the lock cylinder limiter 93 are made of a metal material, a plastic material, and/or a wood material.

The smart lock further includes a position sensor 110; wherein the position sensor 110 includes at least one of a photo sensor, a micro switch, and a capacitive inductive sensor.

The position sensor 110 includes a first conductive contact 1111 fixed to the base 10, a second conductive contact 1112, and a third conductive contact 1113 fixed on the lock core housing 91;

The first conductive contact 1111, the second conductive contact 1112 and the third conductive contact 1113 are disposed along the direction of the motor shaft 82 and are disposed on the same straight line;

The third conductive contact 1113 is disposed between the first conductive contact 1111 and the second conductive contact 1112;

The third conductive contact 1113 follows the lock core housing 91 for contact with the first conductive contact 1111 or the second conductive contact 1112 to form a current loop;

The smart lock circuit acquires a positional relationship between the lock core housing 91 and the lock cylinder 92 through the current loop.

Specifically, the first conductive contact 1111 is disposed closer to the motor 81 with respect to the second conductive contact 1112;

When the first conductive contact 1111 is in contact with the third conductive contact 1113, the smart lock is in a locked state;

When the second conductive contact 1112 is in contact with the third conductive contact 1113, the smart lock is in an unlocked state.

When the third conductive contact 1113 is not in contact with the first conductive contact 1111 and the second conductive contact 1112, the lock cylinder 92 of the smart lock is in an unlocked position and an unlocked position is uncertain. centre position.

When the locking operation is performed, the control module 7 controls the driving module 6 to drive the operating mechanism 8 to lock the lock cylinder mechanism 9. When the motion mechanism 8 returns to the signal that the control module 7 is locked, the control module 7 stops driving immediately. The action mechanism 8; similarly, when the unlocking operation is performed, the control module 7 controls the drive module 6 to drive the action mechanism 8 to unlock the lock cylinder mechanism 9. When the action mechanism 8 returns to the control module 7 to unlock the completed signal, the control module 7 immediately The driving mechanism 8 is stopped.

The working principle of the smart lock of this embodiment is as follows:

The NFC antenna 11 in the NFC communication module 1 of the present embodiment collects the RF energy in the received NFC signal, and transmits it to the rectifier circuit 2 through the NFC communication module 1, and the rectifier circuit 2 converts the AC power corresponding to the received RF energy into DC. High voltage, the DC high voltage is stepped down by the voltage stabilizing circuit 3, converted into a stable DC low voltage, and the NFC communication module 1, the control module 7 and the energy management circuit 4 are supplied with power; meanwhile, the rectifier circuit 2 transmits the converted DC high voltage to The energy management circuit 4 is configured to charge and store the energy storage module 5, and the energy management circuit 4 transmits the DC high voltage to the driving module 6, and the driving module 6 drives the smart lock to perform the locking and unlocking operations.

The motor 81 is connected to the motor 81 in the action mechanism 8 by the drive module 6. The motor 81 is used to convert the electric energy provided by the drive module 6 into kinetic energy to drive the motor shaft 82 to rotate, and the motor shaft 82 rotates to drive the lock core seat 91 along along. The motor shaft 82 moves linearly in the direction; wherein the locking, unlocking or indeterminate state of the smart lock is judged by the contact of the third conductive contact 1113 of the position sensor 110 with the first conductive contact 1111 or the second conductive contact 1112.

While the invention has been described with respect to the embodiments of the present invention, it is understood that the scope of the invention is defined by the appended claims. A person skilled in the art can make various changes or modifications to the embodiments without departing from the spirit and scope of the invention, and these modifications and modifications fall within the scope of the invention.

While the invention has been described with respect to the preferred embodiments of the embodiments of the embodiments of the invention modify. Accordingly, the scope of the invention is defined by the appended claims.

Claims (28)

A smart lock circuit, characterized in that the smart lock circuit comprises an NFC communication module and a drive module; The NFC communication module is electrically connected to the driving module; The NFC communication module includes an NFC antenna, and the NFC antenna is configured to collect power in the received NFC signal; The NFC communication module is configured to transmit power collected by the NFC antenna to the driving module; The drive module is configured to perform an operation of locking and unlocking using a power-driven smart lock. The smart lock circuit of claim 1 wherein said smart lock circuit further comprises an energy management circuit; The energy management circuit is electrically connected to the NFC communication module and the driving module, respectively; The energy management circuit is configured to receive the electrical energy transmitted by the NFC communication module and transmit the received electrical energy to the driving module. The smart lock circuit of claim 2, wherein the smart lock circuit further comprises a rectifier circuit and a voltage stabilization circuit; The rectifier circuit is electrically connected to the NFC communication module, the voltage stabilization circuit, and the energy management circuit, respectively; The NFC communication module is configured to receive radio frequency energy transmitted by the NFC antenna and transmit the radio frequency energy to the rectifying circuit; The rectifier circuit is configured to convert the RF energy into a first DC power and transmit the voltage to the voltage stabilizing circuit and the energy management circuit; The voltage stabilizing circuit is configured to perform buck and voltage stabilization processing on the first DC power, convert into a second DC power, and supply power to the NFC communication module and the energy management circuit; The energy management circuit is configured to transmit the first DC power to the driving module. The smart lock circuit of claim 3, wherein the smart lock circuit further comprises an energy storage module; The energy management circuit is electrically connected to the energy storage module for transmitting the received first DC power to the energy storage module for charging. The smart lock circuit according to claim 4, wherein the energy management circuit is further configured to cut off the power supply when the energy storage module pulls the power collected by the NFC antenna to a first voltage threshold The charging of the energy storage module. The smart lock circuit of claim 5, wherein the energy management circuit comprises a charging switch, the charging switch is electrically connected to the energy storage module, and the energy management circuit is further configured to control the charging switch Turn on and off. The smart lock circuit according to claim 6, wherein said charging switch further comprises a charge inhibiting control terminal, said charge inhibiting control terminal for forcibly turning off said charging switch; And/or, the energy management circuit includes a first voltage comparator; The two input ends of the first voltage comparator respectively input a voltage of the first direct current power and the first voltage threshold, and an output end of the first voltage comparator is electrically connected to the charging switch, The first voltage comparator is configured to output an on signal to the charging switch when the voltage of the first direct current power is higher than the first voltage threshold. The smart lock circuit according to claim 6, wherein said energy storage module is configured to discharge said energy management circuit; The energy management circuit is further configured to transmit the discharged electrical energy of the energy storage module to the driving module. The smart lock circuit according to claim 8, wherein the energy management circuit further comprises a discharge switch, wherein the energy storage module is electrically connected to the drive module through the discharge switch, and the energy management circuit further uses Controlling the on and off of the discharge switch. The smart lock circuit of claim 9 wherein said charging switch has a response time of less than 10 [mu]s and/or said discharge switch has a response time of less than 10 [mu]s. The smart lock circuit of claim 9 wherein said energy management circuit further comprises a second voltage comparator; The two input ends of the second voltage comparator are respectively input to the energy storage voltage of the energy storage module and the second voltage threshold, and the output end of the second voltage comparator is electrically connected to the discharge switch, The two voltage comparators are configured to output a power supply alarm signal to the driving module through the discharging switch when the energy storage voltage of the energy storage module is lower than the second voltage threshold. The smart lock circuit of claim 11 wherein said energy management circuit further comprises a third voltage comparator; The two input ends of the third voltage comparator are respectively input to the energy storage voltage of the energy storage module and the third voltage threshold, the third voltage threshold is smaller than the second voltage threshold, and the third voltage comparator is used And outputting a shutdown signal to the discharge switch when a stored voltage of the energy storage module is lower than the third voltage threshold. The smart lock circuit of claim 3, wherein the smart lock circuit further comprises a control module; The control module is communicably connected to the NFC communication module, the energy management circuit, and the driving module, respectively; The control module is configured to perform data transmission with the NFC communication module; The control module is further configured to send a control instruction to the driving module; The voltage stabilizing circuit is electrically connected to the control module and supplies power to the control module through the second direct current power. The smart lock circuit according to claim 13, wherein the control module is configured to perform user identity verification according to the received NFC signal. The smart lock circuit according to at least one of claims 1 to 14, wherein the drive module comprises a transaxle; The transaxle includes a MOSFET or an IGBT; And/or, the NFC communication module obtains at least 20 mW of electrical energy. The smart lock circuit according to at least one of claims 1 to 15, wherein the NFC antenna comprises an independent energy antenna, a separate receiving antenna and a separate transmitting antenna; the energy antenna is used for collecting and receiving Electrical energy in the NFC signal; The NFC communication module further includes a demodulation module, a modulation module, and an NFC controller, wherein the receiving antenna is electrically connected to the demodulation module, the transmitting antenna is electrically connected to the modulation module, and the NFC controller respectively The demodulation module and the modulation module are electrically connected; The receiving antenna is configured to receive an NFC signal transmitted by an NFC card reader and send the signal to the demodulation module, and the demodulation module demodulates and transmits the demodulated data to the NFC controller; The NFC controller is configured to transmit data to be transmitted to the modulation module according to a predetermined format, and after being modulated by the modulation module, send an NFC signal to the NFC card reader through the transmitting antenna; Or the NFC antenna includes a separate energy antenna and a separate communication antenna; the energy antenna is configured to collect electrical energy in the received NFC signal; The NFC communication module further includes a demodulation module, a modulation module, and an NFC controller, wherein the communication antenna is electrically connected to the demodulation module and the modulation module, respectively; The communication antenna is configured to receive an NFC signal transmitted by an NFC card reader and send the signal to the demodulation module, and the demodulation module demodulates and transmits the demodulated data to the NFC controller; The NFC controller is configured to transmit data to be transmitted to the modulation module according to a predetermined format, and after being modulated by the modulation module, send an NFC signal to the NFC card reader through the communication antenna. The smart lock circuit of claim 13 wherein said NFC communication module further comprises a data interface; said data interface being communicatively coupled to said control module. The smart lock circuit according to claim 3, wherein said rectifier circuit comprises a diode rectifier bridge, wherein said diode rectifier bridge has a diode voltage drop of less than 1 V when the on current is 20 mA, and/or said The voltage stabilizing circuit includes a linear regulator or a switching regulator, and the output voltage of the voltage stabilizing circuit ranges from 1.7V to 3.6V. The smart lock circuit according to claim 4, wherein said energy storage module comprises a storage capacitor; and said storage capacitor has a capacitance value of 22 μF to 0.47 F. A smart lock, comprising the smart lock circuit according to at least one of claims 1 to 19; the smart lock further comprising an action mechanism and a lock cylinder mechanism; The driving module, the action mechanism and the lock cylinder mechanism are connected to each other in turn; The driving module is configured to drive the action mechanism to drive the lock core mechanism to perform an operation of locking and unlocking. The smart lock according to claim 20, wherein the action mechanism comprises a motor and a motor shaft fixed to one side of the motor, and the motor shaft is provided with a thread; The motor is electrically connected to the driving module of the smart lock circuit, and is configured to convert electrical energy provided by the driving module into kinetic energy to drive the motor shaft to rotate; The lock cylinder mechanism includes a lock core seat and a lock core fixed to one side of the lock core seat; The lock core seat is provided with a first opening, and a nut corresponding to the thread on the motor shaft is disposed inside the first opening; The motor shaft is coupled to the lock cylinder housing through the first opening. The smart lock according to claim 21, wherein said smart lock further comprises a lock cylinder limiter; The lock cylinder limiter is provided with a second opening, the lock core is inserted into the lock core limiter through the second opening, the second opening is larger than the lock core; The lock cylinder limiter is configured to limit the rotation of the lock cylinder, ensure linear movement of the lock cylinder along the motor shaft direction, and does not exert resistance to linear movement of the lock cylinder. The smart lock according to claim 22, wherein the diameter of the second opening is 0.8 mm to 3 mm longer than the diameter of the lock cylinder. The smart lock according to claim 22, wherein said smart lock further comprises a base; The motor and the lock cylinder limiter are both fixed to the base. A smart lock according to claim 24, wherein said smart lock further comprises a position sensor; The position sensor includes a first conductive contact and a second conductive contact fixed to the base, and a third conductive contact fixed on the lock core seat; The first conductive contact, the second conductive contact and the third conductive contact are arranged along the motor axis direction and are disposed on the same straight line; The third conductive contact is disposed between the first conductive contact and the second conductive contact; The third conductive contact follows the lock core for movement to contact the first conductive contact or the second conductive contact to form a current loop; The smart lock circuit acquires a positional relationship between the lock core seat and the lock cylinder through the current loop. The smart lock of claim 25 wherein said first electrically conductive contact is closer to said motor relative to said second electrically conductive contact; When the first conductive contact is in contact with the third conductive contact, the smart lock is in a locked state; When the second conductive contact is in contact with the third conductive contact, the smart lock is in an unlocked state. The smart lock of claim 21 wherein said motor comprises a DC stepper motor or a DC non-stepper motor. A smart lock according to claim 24, wherein said lock cylinder seat, said base and said lock cylinder limiter are made of a metal material, a plastic material and/or a wood material.

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