A smart door lock with separated front and rear panels and power off

Abstract

The present invention provides a smart door lock with front and rear panels separated and powered off, the smart door lock with front and rear panels separated and powered off includes a front panel and a rear panel, the rear panel includes: a lithium battery interface, a first front and rear panel connection line interface and a switch circuit; the lithium battery interface is electrically connected to the switch circuit, the switch circuit is connected to the power input end, the first and second front and rear panel connection line interfaces are connected to the power input end, the GND_A end and the GND end; the switch circuit includes a MOS switch, the gate of the MOS switch is connected to the lithium battery interface, the gate of the MOS switch is connected to the USB network through the first capacitor, the drain of the MOS switch is grounded through the first voltage divider circuit, the first voltage divider circuit includes a second resistor and a third resistor, the third resistor is connected to the GND_A end, the voltage dividing point between the second resistor and the third resistor is respectively connected to the first resistor and the third capacitor, and the source of the MOS switch is connected to the power input end; the front panel includes: a USB interface is connected to the USB network; the GND_A end is short-circuited with the GND end. Avoid system abnormality and battery overdischarge.

Description

Technical Field

[0001] The present invention relates to the technical field of door locks, and in particular to an intelligent door lock with front and rear panels separated and powered off. Background Art

[0002] With the development of door locks, fingerprint locks with higher security are becoming more and more common. Compared with mechanical locks, fingerprint locks have added fingerprint recognition modules and action motors. After successful recognition, the fingerprint recognition module controls the action motor to start, and then drives the lock cylinder clutch mechanism to unlock and lock.

[0003] However, existing intelligent door lock devices are generally composed of front and rear panels, with power and communication connection lines in the middle, and the core control circuit and power supply are generally on the rear panel to ensure safety.

[0004] If the battery is not removed and the front and rear boards are not connected during storage and transportation, system abnormalities and battery over-discharge may occur. If the battery is not removed and the front half board is connected during installation, hardware damage may occur due to hot plugging. Summary of the invention

[0005] In view of the above problems existing in the prior art, a smart door lock with front and rear panels separated and powered off is provided.

[0006] The specific technical solutions are as follows:

[0007] A smart door lock with front and rear panels separated and powered off, wherein the smart door lock with front and rear panels separated and powered off comprises a front panel and a rear panel, and the front panel is electrically connected to the rear panel;

[0008] The rear panel includes: a lithium battery interface, a first front and rear panel connecting line interface and a switch circuit;

[0009] The lithium battery interface is electrically connected to the switch circuit, the switch circuit is connected to the power input terminal, and the first front and rear board connection line interface is connected to the power input terminal, the GND_A terminal and the GND terminal;

[0010] The switch circuit includes a MOS switch, the gate of the MOS switch is connected to the lithium battery interface, the gate of the MOS switch is connected to the USB network through the first capacitor, the drain of the MOS switch is grounded through the first voltage divider circuit, the first voltage divider circuit includes a second resistor and a third resistor, the third resistor is connected to the GND_A terminal, the voltage dividing point between the second resistor and the third resistor is connected to the first resistor and the third capacitor respectively, and the source of the MOS switch is connected to the power input terminal;

[0011] The front panel includes: USB interface and the second front and rear panel cable interface;

[0012] The USB interface is connected to the USB network, and the second front and rear board connection line interface is connected to the power input terminal, the GND_A terminal and the GND terminal;

[0013] The GND_A terminal is short-circuited to the GND terminal.

[0014] Preferably, a smart door lock with separate front and rear panels and power-off, wherein the voltage at the power input terminal is greater than the voltage of the USB network. Preferably, a smart door lock with separate front and rear panels and power-off, wherein the first pin of the lithium battery interface is connected to the switching circuit, the second pin of the lithium battery interface is connected to the GND terminal, and the third pin of the lithium battery interface is connected to the USB network.

[0015] Preferably, in a smart door lock with separated front and rear panels and power off, the first pin of the first front and rear panel connection line interface is connected to the power input terminal;

[0016] The second pin of the first front-back board connecting line interface is connected to the USB network, the ninth pin of the first front-back board connecting line interface is connected to the GND_A terminal, and the tenth pin of the first front-back board connecting line interface is connected to the GND terminal.

[0017] Preferably, in a smart door lock with separated front and rear panels and power off, the first pin of the second front and rear panel connection line interface is connected to the power input terminal;

[0018] The second pin of the second front-back board connecting line interface is connected to the USB network, the ninth pin of the second front-back board connecting line interface is connected to the GND_A terminal, and the tenth pin of the first front-back board connecting line interface is connected to the GND terminal.

[0019] Preferably, a smart door lock with separated front and rear panels and power off, wherein the third pin to the eighth pin of the first front and rear panel connecting line interface or the second front and rear panel connecting line interface are communication interfaces.

[0020] Preferably, a smart door lock with the front and rear panels separated and powered off, wherein the front panel also includes a short-circuiting resistor, one end of the short-circuiting resistor is connected to the GND_A terminal, and the other end is connected to the GND terminal; the resistance value of the short-circuiting resistor is 0 ohm.

[0021] Preferably, a smart door lock with separated front and rear panels and power off, wherein the first pin and the second pin of the USB interface are both connected to the USB network, and the first pin and the second pin of the USB interface are both connected to the GND terminal through an electrostatic protector;

[0022] The third pin of the USB interface is the lithium battery charging interface;

[0023] The fourth pin and the fifth pin of the USB interface are both connected to the GND terminal.

[0024] Preferably, a smart door lock with the front and rear panels separated and powered off, wherein the switch circuit also includes a diode, the cathode of the diode is connected to the second end of the first resistor, and the anode of the diode is connected to the GND_A end.

[0025] Preferably, the front and rear panels of the smart door lock are separated and powered off, wherein the diode is a voltage-stabilizing diode.

[0026] The above technical solution has the following advantages or beneficial effects: when the front panel and the rear panel are not connected, the line of sight automatically disconnects the lithium battery power input to avoid system abnormalities and battery over-discharge, and avoids hardware damage caused by hot plugging when the front half panel is connected without unplugging the battery during installation. At the same time, the corresponding power-off protection can also be triggered when someone maliciously pries the lock and damages the front panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A front panel circuit diagram of an embodiment of an intelligent door lock with front and rear panels separated and powered off according to the present invention;

[0028] Figure 2 This is a circuit diagram of the rear panel of an embodiment of a smart door lock with the front and rear panels separated and powered off according to the present invention.

[0029] Figure numerals: first front and rear board connecting line interface J1, lithium battery interface J2, MOS switch Q, first capacitor C1, second capacitor C2, third capacitor C3, first resistor R1, second resistor R2, third resistor R3, voltage dividing point P, diode D, power input terminal VIN, USB network USB, second front and rear board connecting line interface J2, USB interface J4, electrostatic protector E, short-circuit resistor R4. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0033] A smart door lock with front and rear panels separated and powered off, comprising a front panel and a rear panel, wherein the front panel is electrically connected to the rear panel;

[0034] The rear panel includes: a lithium battery interface J2, a first front and rear panel connecting line interface J1 and a switch circuit;

[0035] The lithium battery interface J2 is electrically connected to the switch circuit, the switch circuit is connected to the power input terminal VIN, and the first front and rear board connection line interface J1 is connected to the power input terminal VIN, the GND_A terminal and the GND terminal;

[0036] The switch circuit includes a MOS switch Q, a gate of the MOS switch Q is connected to the lithium battery interface J2, a gate of the MOS switch Q is connected to the USB network through a first capacitor C1, a drain of the MOS switch Q is grounded through a first voltage divider circuit, the first voltage divider circuit includes a second resistor R2 and a third resistor R3, the third resistor R3 is connected to the GND_A terminal, a voltage dividing point P between the second resistor R2 and the third resistor R3 is connected to the first resistor R1 and the third capacitor C3 respectively, and a source of the MOS switch Q is connected to a power input terminal VIN;

[0037] The front panel includes: USB interface J4 and the second front and rear panel connection line interface J3;

[0038] The USB interface J4 is connected to the USB network, and the second front and rear board connection line interface J3 is connected to the power input terminal VIN, GND_A terminal and GND terminal;

[0039] The GND_A terminal is short-circuited to the GND terminal.

[0040] In the above embodiment, when the front panel and the rear panel are not connected, the line of sight automatically disconnects the lithium battery power input to avoid system abnormalities and battery over-discharge, and avoids hardware damage caused by hot plugging when the front half panel is connected without unplugging the battery during installation. At the same time, the corresponding power-off protection can also be triggered when someone maliciously pries the lock and damages the front panel.

[0041] In the above embodiment, when the connection between the front panel and the rear panel is normal, when the user inserts the battery to power on, the first capacitor C1 is slowly charged through the first resistor R1, and the first capacitor C1 is saturated and then grounded after being divided by the third resistor R3. In this process, the MOS gate voltage changes to delay the conduction of the MOS switch Q, thereby achieving the purpose of slow start protection, thereby avoiding the power supply jitter caused by the moment of inserting the battery to affect the smart door lock function, and the charging and discharging process can be controlled by adjusting the parameters of RC (RC includes: the first capacitor C1, the first resistor R1 and the third resistor R3), and the gate of the MOS switch Q is controlled to conduct, thereby realizing the control of the rising slope and amplitude of the input voltage; wherein, it should be noted that: the charging and discharging current can be controlled by adjusting the resistance value of the first resistor R1 and / or the third resistor R3, and the charge amount can be controlled by adjusting the first capacitor C1, and the voltage rising slope after the MOS is turned on can be realized by adjusting the parameters of these three electronic devices.

[0042] Furthermore, in the above embodiment, the voltage of the power input terminal VIN is greater than the voltage of the USB network.

[0043] Furthermore, in the above embodiment, the resistance values ​​of the first resistor R1 and the third resistor R3 are the same.

[0044] In the above embodiment, the first end of the first capacitor C1 is connected to the gate of the MOS switch Q, and the source of the MOS switch Q is connected to the power input terminal VIN;

[0045] The first end of the first capacitor C1 is connected to the first resistor R1 and the third resistor R3 respectively, and the first resistor R1 and the third resistor R3 can form a second voltage divider circuit, and the voltage can be maintained at 1 / 2 of the lithium battery input voltage through the second voltage divider circuit. At the moment of USB insertion, the voltage at the second end of the first capacitor C1 can be the voltage of the USB network through the first front and rear board connection line interface J1 and the second front and rear board connection line interface J3 that are connected to each other. Since the voltage of the power input terminal VIN is greater than the voltage of the USB network, there is a voltage difference between the two ends of the first capacitor C1, so that the gate of the MOS switch Q is pulled up during the slow charging process, the main circuit is disconnected, and the system is powered off and reset. After the first capacitor C1 is charged, the system resumes normal power supply, and the USB network starts to charge the lithium battery at the power input terminal VIN.

[0046] When the connection between the front panel and the rear panel is normal, and the lock cannot open the door due to low voltage or system failure, the user can use a power bank USB to plug into the front panel of the lock outside the door to achieve the purpose of charging and resetting.

[0047] As a preferred implementation, the resistance values ​​of the first resistor R1 and the third resistor R3 may be 2 MΩ, wherein the resistance value of the second resistor R2 may be 1 KΩ.

[0048] In the above embodiment, when the front panel and the rear panel are normally connected, the gate of the MOS switch of the front panel is connected to the rear panel through a wire and grounded, and is in a pull-down state at this time, so it is turned on. However, when the front panel and the rear panel are disconnected, the GND_A network is disconnected and suspended, and the gate of the MOS switch Q is pulled up and disconnected, that is, it is in a pull-up state at this time, and the main circuit is powered off.

[0049] As a preferred implementation, the voltage of the power input terminal VIN may be set to 8V, and the voltage of the USB network may be set to 5V.

[0050] In a preferred embodiment, the first end of the first capacitor C1 is connected to the gate of the MOS switch Q, and the source of the MOS switch Q is connected to the power input terminal VIN, wherein the power input terminal VIN is an 8V lithium battery;

[0051] The first end of the first capacitor C1 is connected to the first resistor R1 and the third resistor R3 respectively, and the first resistor R1 and the third resistor R3 can form a second voltage divider circuit, and the voltage can be maintained at 1 / 2 of the lithium battery input voltage through the second voltage divider circuit. At the moment of USB insertion, the USB network is 5V high level, and the voltage at the second end of the first capacitor C1 can be 5V through the interconnected first front and rear board connection line interface J1 and the second front and rear board connection line interface J3. Due to the voltage difference between the two ends of the first capacitor C1, the slow charging process will cause the gate of the MOS switch Q to be pulled high, the main circuit is disconnected, and the system is powered off and reset. After the first capacitor C1 is charged, the system resumes normal power supply, and the USB network starts to charge the lithium battery at the same time.

[0052] In the above embodiment, the MOS switch Q may be a PMOS tube.

[0053] In the above embodiment, the MOS switch Q may be a high-power MOS tube packaged with multiple pins connected in parallel to carry a large current.

[0054] Furthermore, in the above embodiment, the first pin of the lithium battery interface J2 is connected to the switch circuit, the second pin of the lithium battery interface J2 is connected to the GND terminal, and the third pin of the lithium battery interface J2 is connected to the USB network.

[0055] Further, in the above embodiment, the first pin of the first front-rear board connecting line interface J1 is connected to the power input terminal VIN;

[0056] The second pin of the first front-back board connecting line interface J1 is connected to the USB network, the ninth pin of the first front-back board connecting line interface J1 is connected to the GND_A terminal, and the tenth pin of the first front-back board connecting line interface J1 is connected to the GND terminal.

[0057] Further, in the above embodiment, the first pin of the second front-rear board connecting line interface J3 is connected to the power input terminal VIN;

[0058] The second pin of the second front-back board connecting line interface J3 is connected to the USB network, the ninth pin of the second front-back board connecting line interface J3 is connected to the GND_A terminal, and the tenth pin of the first front-back board connecting line interface J1 is connected to the GND terminal.

[0059] Furthermore, in the above embodiment, the third pin to the eighth pin of the first front-rear board connecting wire interface J1 or the second front-rear board connecting wire interface J3 are communication interfaces.

[0060] Furthermore, in the above embodiment, the front panel further includes a shorting resistor R4, one end of the shorting resistor R4 is connected to the GND_A terminal, and the other end is connected to the GND terminal; the resistance value of the shorting resistor R4 is 0 ohm.

[0061] Further, in the above embodiment, the first pin and the second pin of the USB interface J4 are both connected to the USB network, and the first pin and the second pin of the USB interface J4 are both connected to the GND terminal through the electrostatic protector E (ESD device);

[0062] The third pin of the USB interface J4 is a lithium battery charging interface, so that the USB on the front panel can be plugged into the rear panel to charge the lithium battery;

[0063] The fourth pin and the fifth pin of the USB interface J4 are both connected to the GND terminal.

[0064] Furthermore, in the above embodiment, the switch circuit further includes a diode D, a cathode of the diode D is connected to the second end of the first resistor R1, and an anode of the diode D is connected to the GND_A end.

[0065] Furthermore, in the above embodiment, the diode D is a voltage regulator diode.

[0066] As a specific implementation, the smart door lock includes a front panel and a rear panel, and the front panel is electrically connected to the rear panel;

[0067] The rear panel includes: a lithium battery interface J2, a first front and rear panel connecting line interface J1 and a switch circuit;

[0068] The first pin of the lithium battery interface J2 is connected to the switch circuit, the second pin of the lithium battery interface J2 is grounded, and the third pin of the lithium battery interface J2 is connected to the USB network;

[0069] The switch circuit includes a MOS switch Q, a gate of the MOS switch Q is connected to a first pin of the lithium battery interface J2, a gate of the MOS switch Q is connected to a first end of a second capacitor C2, a first end of the second capacitor C2 is also connected to a first pin of the lithium battery interface J2, and a second end of the second capacitor C2 is grounded;

[0070] The gate of the MOS switch Q is connected to the first end of the first resistor R1, the second end of the first resistor R1 is connected to the first end of the first capacitor C1, the second end of the first capacitor C1 is connected to the USB network, the drain of the MOS switch Q is grounded through a first voltage divider circuit, the first voltage divider circuit includes a second resistor R2 and a third resistor R3, a voltage dividing point P between the second resistor R2 and the third resistor R3 is connected to the second end of the first resistor R1, at this time, the first resistor R1 and the third resistor R3 constitute a second voltage divider circuit, the second end of the first resistor R1 is connected to the cathode of the diode D, and the anode of the diode D is grounded; the voltage dividing point P between the second resistor R2 and the third resistor R3 is connected to the first end of the third capacitor C3, the source of the MOS switch Q is connected to the power input terminal VIN, and the power input terminal VIN is grounded through the third capacitor C3C1;

[0071] The first pin of the first front-rear board connecting line interface J1 is connected to the switch circuit;

[0072] The second pin of the first front-back panel connecting line interface J1 is used to connect to the USB network, the ninth pin of the first front-back panel connecting line interface J1 is the rear panel GNDA ground loop input pin, and the tenth pin of the first front-back panel connecting line interface J1 is grounded;

[0073] The front panel includes: a USB interface J4, a fourth resistor and a second front and rear panel connection line interface J3;

[0074] The first pin of the USB interface J4 is connected to the USB network, and the first pin of the USB interface J4 is grounded through an electrostatic protector E;

[0075] The second pin of the USB interface J4 is connected to the USB network, and the second pin of the USB interface J4 is grounded through an electrostatic protector E;

[0076] The fourth and fifth pins of the USB interface J4 are grounded;

[0077] The USB interface J4 is connected to the USB network, and the second front and rear board connection line interface J3 is connected to the power input terminal VIN;

[0078] The first pin of the second front-to-back panel connection line interface J3 is a voltage input pin, the second pin of the first front-to-back panel connection line interface J1 is a USB network connection interface, the ninth pin of the second front-to-back panel connection line interface J3 is a rear panel GNDA ground loop input pin, which is used to connect to the GND_A terminal, and the tenth pin of the second front-to-back panel connection line interface J3 is grounded;

[0079] Two ends of the fourth resistor are connected to the GND_A end and the GND end respectively.

[0080] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A smart door lock with front and rear panels separated and powered off, characterized in that: The smart door lock with separated front and rear panels and power-off comprises a front panel and a rear panel, and the front panel is electrically connected to the rear panel; The rear panel includes: a lithium battery interface, a first front and rear panel connecting line interface and a switch circuit; The lithium battery interface is electrically connected to the switch circuit, the switch circuit is connected to the power input terminal, and the first front and rear board connection line interface is connected to the power input terminal, the GND_A terminal and the GND terminal; The switch circuit includes a MOS switch, the gate of the MOS switch is connected to the lithium battery interface, the gate of the MOS switch is connected to the USB network through a first capacitor, the drain of the MOS switch is grounded through a first voltage divider circuit, the first voltage divider circuit includes a second resistor and a third resistor, the third resistor is connected to the GND_A terminal, the voltage dividing point between the second resistor and the third resistor is connected to the first resistor and the third capacitor respectively, and the source of the MOS switch is connected to the power input terminal; The front panel includes: a USB interface and a second front and rear panel connection line interface; The USB interface is connected to the USB network, and the second front and rear board connection line interface is connected to the power input terminal, the GND_A terminal and the GND terminal; The GND_A terminal is short-circuited to the GND terminal.

2. The smart door lock with front and rear panels separated and powered off as claimed in claim 1, characterized in that: The voltage at the power input is greater than the voltage of the USB network.

3. The smart door lock with front and rear panels separated and powered off as claimed in claim 1, characterized in that: The first pin of the lithium battery interface is connected to the switch circuit, the second pin of the lithium battery interface is connected to the GND terminal, and the third pin of the lithium battery interface is connected to the USB network.

4. The smart door lock with front and rear panels separated and powered off as claimed in claim 1, characterized in that: The first pin of the first front and rear board connecting line interface is connected to the power input end; The second pin of the first front and rear board connection line interface is connected to the USB network, the ninth pin of the first front and rear board connection line interface is connected to the GND_A terminal, and the tenth pin of the first front and rear board connection line interface is connected to the GND terminal.

5. The smart door lock with front and rear panels separated and powered off as claimed in claim 1, characterized in that: The first pin of the second front-rear board connecting line interface is connected to the power input terminal; The second pin of the second front-and-back panel connecting wire interface is connected to the USB network, the ninth pin of the second front-and-back panel connecting wire interface is connected to the GND_A terminal, and the tenth pin of the first front-and-back panel connecting wire interface is connected to the GND terminal.

6. The smart door lock with separated front and rear panels and power off as claimed in any one of claims 4 to 5, characterized in that: The third pin to the eighth pin of the first front-rear board connecting wire interface or the second front-rear board connecting wire interface is a communication interface.

7. The smart door lock with front and rear panels separated and powered off as claimed in claim 1, characterized in that: The front panel also includes a shorting resistor, one end of which is connected to the GND_A terminal, and the other end is connected to the GND terminal; the resistance value of the shorting resistor is 0 ohm.

8. The smart door lock with front and rear panels separated and powered off as claimed in claim 1, characterized in that: The first pin and the second pin of the USB interface are both connected to the USB network, and the first pin and the second pin of the USB interface are both connected to the GND terminal through an electrostatic protector; The third pin of the USB interface is a lithium battery charging interface; The fourth pin and the fifth pin of the USB interface are both connected to the GND terminal.

9. The smart door lock with front and rear panels separated and powered off as claimed in claim 1, characterized in that: The switch circuit further includes a diode, a cathode of the diode is connected to the second end of the first resistor, and an anode of the diode is connected to the GND_A end.

10. The smart door lock with front and rear panels separated and powered off as claimed in claim 9, characterized in that: The diode is a voltage stabilizing diode.

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