Self-generating lock based on near field communication

Abstract

The utility model discloses a self-generating lock based on near field communication (NFC). The self-generating lock comprises an antenna, an NFC tag chip, a self-generating circuit, a driving unlocking module and a lock head, wherein the antenna is connected with the NFC label chip through the antenna interface, the self-generating circuit is respectively connected with the NFC label chip, the driving unlocking module and the antenna, the NFC label chip is connected with the driving unlocking module, and the driving unlocking module is connected with the lock head. According to the utility model, electromagnetic wave signals of near field communication are used for providing power supply, passive unlocking at the lock end is realized, the problem that the electronic lock cannot be unlocked due to the fact that a battery is out of power is thoroughly solved, and the user pain point that the battery of the existing electronic lock needs to be frequently replaced is eliminated.

Description

Technical Field

[0001] The utility model relates to a self-generating lock based on near field communication, belonging to the field of electronic locks. Background Art

[0002] At present, electronic locks are widely used in daily life. Traditional electronic locks are powered by built-in batteries, which means that the batteries must be replaced regularly, which is cumbersome to operate. In order to avoid the maintenance cost caused by frequent battery replacement, some passive lock technical solutions have been proposed, that is, there is no battery inside the electronic lock. Typical passive lock solutions include the following:

[0003] 1. Electronic key solution: The battery is placed in the key. When in use, a specific electronic key needs to be inserted into the electronic lock to power it. The electronic key is carried by the user and needs to be charged in time when the power is exhausted.

[0004] 2. Near Field Communication Solution: Based on the principle of wireless energy transmission through Near Field Communication (NFC), the device with NFC function is placed close to the electronic lock to transmit energy to the electronic lock through NFC. The NFC chip built into the electronic lock receives the energy to realize power supply.

[0005] In the Chinese invention patent with patent number CN109458059B, a self-generating door lock device is disclosed. The self-generating door lock device includes an operating part, an energy storage module, a transmission assembly and a self-generating module, and the self-generating module includes a motion module and a static module; the operating part is coupled with the first end of the energy storage module, the second end of the energy storage module is coupled with the first end of the transmission assembly, and the second end of the transmission assembly is coupled with the motion module; the operating part is used to receive external force to drive the energy storage module to deform to store energy; the energy storage module is used to release energy to drive the transmission assembly to move, thereby driving the motion module to move relative to the static module to generate an induced voltage.

[0006] In addition, in the Chinese patent application with publication number CN110533803A, a passive intelligent electronic lock based on NFC electromagnetic field power supply is disclosed. The electronic lock is equipped with a control unit, an NFC data communication unit and a temporary energy storage unit; the switch lock actuator includes an unlocking / locking actuator, a state detection unit, a locking buckle and a backup unlocking mechanism, which can avoid battery and power supply maintenance costs, but its structure is relatively complex, resulting in high manufacturing costs. Summary of the invention

[0007] The technical problem to be solved by the utility model is to provide a self-generating lock based on near field communication.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A self-generating lock based on near field communication, comprising an antenna, an NFC tag chip, a self-generating circuit, a drive unlocking module and a lock head;

[0010] Among them, the antenna is connected to the NFC tag chip through an antenna interface, the self-generating circuit is connected to the NFC tag chip, the driving unlocking module and the antenna respectively, the NFC tag chip is connected to the driving unlocking module, and the driving unlocking module is connected to the lock head.

[0011] Preferably, the self-generating circuit includes an LC resonant circuit, a first capacitor, a second capacitor, a rectifier bridge and a low-voltage dropout regulator; wherein one end of the LC resonant circuit is connected to one end of the first capacitor, the other end of the LC resonant circuit is respectively connected to the second ground terminal and the rectifier bridge, and the other end of the first capacitor is respectively connected to the first ground terminal and the rectifier bridge; the rectifier bridge, the second capacitor and the low-voltage dropout regulator are connected in parallel.

[0012] Preferably, the rectifier bridge includes a first diode, a second diode, a third diode, and a fourth diode; wherein the anode of the first diode is respectively connected to one end of the first capacitor and the cathode of the third diode, the cathode of the first diode is connected to the cathode of the second diode, the anode of the second diode is connected to the cathode of the fourth diode, the anode of the third diode is connected to the anode of the fourth diode, and the anode of the fourth diode is connected to one end of the LC resonant circuit.

[0013] Preferably, the coil in the LC resonant circuit senses the electromagnetic wave signal of the near field communication and converts it into alternating current, and the alternating current is converted into direct current through a rectifier bridge to provide power supply to the NFC tag chip and the drive unlocking module.

[0014] Preferably, the NFC tag chip exchanges data with the antenna through the first external antenna interface and the second external antenna interface to obtain an unlocking instruction; after obtaining power supply, the unlocking instruction is sent to the driving unlocking module in a high level manner.

[0015] Preferably, the unlocking drive module receives the unlocking command sent by the NFC tag chip and transmits it to the motor driving chip; the gear on the motor rotates accordingly, and the lock bolt connected to the gear is driven and pulled out by the gear, thereby realizing the opening of the self-generating lock.

[0016] Preferably, the self-generating lock further comprises a mechanical unlocking module; the mechanical unlocking module is connected to the lock head and is used to pull out the lock bolt in combination with a spare key to open the self-generating lock when the unlocking module fails.

[0017] Compared with the prior art, the utility model utilizes the electromagnetic wave signal of near-field communication to provide power supply, realizes passive unlocking on the lock side, completely solves the problem that the electronic lock cannot be unlocked due to dead battery, and eliminates the user pain point that the existing electronic lock needs to frequently replace the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a working principle diagram of the self-generating lock provided by the utility model;

[0019] Figure 2 This is a circuit structure diagram of a self-generating circuit in an embodiment of the utility model;

[0020] Figure 3 This is a power supply signal flow diagram of the self-generating circuit in the embodiment of the utility model;

[0021] Figure 4 This is a schematic diagram of the internal structure of the drive unlocking module in an embodiment of the utility model. DETAILED DESCRIPTION

[0022] The technical content of the present utility model is described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1 As shown, the embodiment of the utility model discloses a self-generating lock based on near field communication, which at least includes an antenna, an NFC tag (Tag) chip, a self-generating circuit, a drive unlocking module, a lock head, and a mechanical unlocking module. Among them, the antenna is connected to the NFC tag chip through the first external antenna interface TX1 and the second external antenna interface TX2 interface, and the self-generating circuit is connected to the NFC tag chip, the drive unlocking module and the antenna respectively. The NFC tag chip is connected to the RX interface of the drive unlocking module through the DOUT interface, and the drive unlocking module is connected to the lock head. In addition, the mechanical unlocking module is also connected to the lock head, which is used to pull out the lock bolt in combination with the spare key when the drive unlocking module fails, so as to realize the opening of the self-generating lock.

[0024] like Figure 2As shown, in one embodiment of the utility model, the self-generating circuit includes an LC resonant circuit (RX LCTank), a first capacitor C1, a first ground terminal com1, a second ground terminal com2, a rectifier bridge, a second capacitor C2, and a low-dropout regulator (LDO). One end of the LC resonant circuit is connected to one end of the first capacitor C1, the other end of the LC resonant circuit is respectively connected to the second ground terminal com2 and the rectifier bridge, and the other end of the first capacitor C1 is respectively connected to the first ground terminal com1 and the rectifier bridge. The rectifier bridge, the second capacitor C2, and the low-dropout regulator are connected in parallel to output a direct current VOUT to the outside.

[0025] In one embodiment of the utility model, the rectifier bridge includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4. The anode of the first diode D1 is connected to one end of the first capacitor C1 and the cathode of the third diode D3, respectively; the cathode of the first diode D1 is connected to the cathode of the second diode D2; the anode of the second diode D2 is connected to the cathode of the fourth diode D4; the anode of the third diode D3 is connected to the anode of the fourth diode D4; and the anode of the fourth diode D4 is connected to one end of the LC resonant circuit.

[0026] like Figure 3 As shown, the signal transmitting end of the near field communication transmits an electromagnetic wave signal through an antenna. After the electromagnetic wave signal is received by the antenna in the self-generating lock, it is input into the LC resonant circuit in the self-generating circuit. The coil in the LC resonant circuit senses the electromagnetic wave signal of the near field communication and converts it into alternating current, which is converted into direct current VOUT through a rectifier bridge to provide power supply to the NFC tag chip and the drive unlocking module. Next, the NFC tag chip exchanges data with the antenna through the first external antenna interface TX1 and the second external antenna interface TX2 to obtain an unlocking instruction. After obtaining power supply, the unlocking instruction is sent to the drive unlocking module in a high level manner.

[0027] like Figure 4As shown, the unlocking module receives the unlocking command sent by the NFC tag chip through the RX interface, and transmits the unlocking command to the motor driver chip. After the motor driver chip receives the unlocking command, it drives the motor to rotate clockwise, that is, the gear on the motor rotates clockwise. Because the gear on the motor is connected to the lock bolt, when the gear rotates clockwise, the lock bolt is driven and pulled out by the gear. At this time, the door lock handle is unlocked, that is, the user can open the lock head by turning the door lock handle to open the self-generating lock; when closing the lock, the lock head touches the lock bolt and pushes the lock bolt back to the locked state to close the self-generating lock. In addition, this self-generating lock sets the no-power state as the lock state by default, and can be unlocked after the power is turned on, eliminating the cumbersome state detection process, reducing the time required for unlocking to a minimum, and greatly saving time costs.

[0028] In one embodiment of the present invention, the mechanical unlocking module is a backup unlocking mechanism, which includes but is not limited to a conventional mechanical lock cylinder, a customs lock cylinder or an electronic passive lock cylinder, etc. The mechanical unlocking module is connected to the lock head and is used to pull out the lock bolt in combination with the backup key to open the self-generating lock when the driving unlocking module fails.

[0029] Compared with the prior art, the utility model utilizes the electromagnetic wave signal of near-field communication to provide power supply, realizes passive unlocking on the lock side, completely solves the problem that the electronic lock cannot be unlocked due to dead battery, and eliminates the user pain point that the existing electronic lock needs to frequently replace the battery.

[0030] The self-generating lock based on near field communication provided by the utility model is described in detail above. For those skilled in the art, any obvious changes made to the utility model without departing from the essence of the utility model will constitute an infringement of the patent right of the utility model and will bear corresponding legal responsibilities.

Claims

1. A self-generating lock based on near field communication, characterized in that Including antenna, NFC tag chip, self-generating circuit, drive unlocking module and lock; The antenna is connected to the NFC tag chip through an antenna interface, the self-generating circuit is connected to the NFC tag chip, the drive unlocking module and the antenna respectively, the NFC tag chip is connected to the drive unlocking module, and the drive unlocking module is connected to the lock head; The self-generating circuit includes an LC resonant circuit, a first capacitor, a second capacitor, a rectifier bridge and a low-voltage dropout regulator; wherein one end of the LC resonant circuit is connected to one end of the first capacitor, the other end of the LC resonant circuit is respectively connected to the second ground terminal and the rectifier bridge, and the other end of the first capacitor is respectively connected to the first ground terminal and the rectifier bridge; the rectifier bridge, the second capacitor and the low-voltage dropout regulator are connected in parallel.

2. The self-generating lock according to claim 1, characterized in that: The rectifier bridge includes a first diode, a second diode, a third diode, and a fourth diode; wherein the anode of the first diode is connected to one end of the first capacitor and the cathode of the third diode respectively, the cathode of the first diode is connected to the cathode of the second diode, the anode of the second diode is connected to the cathode of the fourth diode, the anode of the third diode is connected to the anode of the fourth diode, and the anode of the fourth diode is connected to one end of the LC resonant circuit.

3. The self-generating lock according to claim 1, characterized in that: The coil in the LC resonant circuit senses the electromagnetic wave signal of the near field communication and converts it into alternating current, which is then converted into direct current through a rectifier bridge to provide power supply to the NFC tag chip and the drive unlocking module.

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