Wireless power supply circuit and intelligent lock

Abstract

An embodiment of the utility model provides a wireless power supply circuit and an intelligent lock, and relates to the technical field of intelligent locks, the wireless power supply circuit comprises a control module, a rectification module and a power supply module, and the wireless power supply circuit is electrically connected with an induction coil through the control module and sends a first control signal to the power supply module under the condition that the induction coil is successfully matched with external equipment; the rectifier module is electrically connected with the induction coil to convert an alternating-current electric signal output by the induction coil into a direct-current electric signal, and then the power supply module outputs a power supply signal according to the direct-current electric signal under the condition that the first control signal is obtained so as to supply power to the intelligent lock; the external device supplies power to the intelligent lock through the induction coil, a built-in battery of the intelligent lock does not need to be used for supplying power, and the use stability of the intelligent lock is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of smart locks, and in particular to a wireless power supply circuit and a smart lock. Background Art

[0002] A smart lock is a product that uses modern technologies such as electronic technology, biometric technology, and network communication technology to achieve intelligent management of door locks. Smart locks are suitable for a variety of occasions such as homes, offices, and hotels, providing higher security and convenience than traditional mechanical locks.

[0003] In the prior art, smart locks are powered by built-in batteries.

[0004] In the process of implementing the present application, the inventors found that there are at least the following problems in the prior art: since the smart lock is powered by a built-in battery and is limited by the battery power, the smart lock cannot be used if the battery power is too low. Utility Model Content

[0005] The utility model provides a wireless power supply circuit and a smart lock, so as to at least solve the problem in the prior art that the smart lock cannot be used due to low power of a battery built in the smart lock.

[0006] In a first aspect, an embodiment of the utility model provides a wireless power supply circuit, including: a control module, a rectifier module, and a power supply module;

[0007] The control module is electrically connected to the power supply module, and the control module is used to be electrically connected to the induction coil, and send a first control signal to the power supply module when the induction coil is successfully matched with the external device;

[0008] The rectifier module is electrically connected to the power supply module, and is used to be electrically connected to the induction coil and convert the AC signal output by the induction coil into a DC signal;

[0009] The power supply module is used to output a power supply signal according to the direct current signal when the first control signal is acquired.

[0010] Optionally, the rectifier module includes a rectifier unit and a switch unit; the control module is also electrically connected to the switch unit, and the control module is also used to send a second control signal to the switch unit when the induction coil is successfully matched with the external device; the rectifier unit is electrically connected to the switch unit, and the rectifier unit is used to be electrically connected to the induction coil and convert the AC signal output by the induction coil into a DC signal; the switch unit is electrically connected to the power supply module, and the switch unit is used to connect the rectifier unit and the power supply module when the second control signal is obtained, so that the rectifier unit provides the DC signal to the power supply module.

[0011] Optionally, the rectifying unit includes a first diode, a second diode, a third diode, and a fourth diode; the anode of the first diode is electrically connected to the cathode of the second diode, and the cathode of the first diode is electrically connected to the cathode of the third diode and the first end of the switching unit respectively; the anode of the first diode is also used to be electrically connected to the first end of the induction coil; the anode of the second diode is electrically connected to the anode of the fourth diode, and the anode of the second diode is grounded; the anode of the second diode is also used to be electrically connected to the first end of the induction coil; the anode of the third diode is electrically connected to the anode of the fourth diode The cathode of the third diode is electrically connected to the first end of the switch unit; the anode of the third diode is also used to be electrically connected to the second end of the induction coil; the anode of the fourth diode is grounded, and the cathode of the fourth diode is also used to be electrically connected to the second end of the induction coil; the second end of the switch unit is electrically connected to the first control end of the control module, and the third end of the switch unit is electrically connected to the first end of the power supply module; the second end of the power supply module is grounded, the third end of the power supply module is electrically connected to the second control end of the control module, and the fourth end of the power supply module is used to output the power supply signal.

[0012] Optionally, the rectifier module further includes a fifth diode, the anode of the fifth diode is grounded, and the cathode of the fifth diode is electrically connected to the cathode of the first diode and the cathode of the third diode respectively.

[0013] Optionally, the switching unit includes a MOS tube and a first resistor; the source of the MOS tube is electrically connected to the first output end of the rectifier unit, the drain of the MOS tube is electrically connected to the first end of the power supply module, and the gate of the MOS tube is electrically connected to the first end of the first resistor; the second end of the first resistor is electrically connected to the first control end of the control module; the second output end of the rectifier unit is grounded; the second end of the power supply module is grounded, the third end of the power supply module is electrically connected to the second control end of the control module, and the fourth end of the power supply module is used to output the power supply signal.

[0014] Optionally, the control module is also electrically connected to the rectifier module, and the control module is specifically used to send a second control signal to the rectifier module when the induction coil is successfully matched with the external device, and to send the first control signal to the power supply module when it is detected that the power supply module is fully charged; the rectifier module is specifically used to convert the AC signal output by the induction coil into the DC signal when the second control signal is obtained, and use the DC signal to charge the power supply module.

[0015] Optionally, the power supply module includes a capacitor unit and a voltage stabilizing unit; the capacitor unit is electrically connected to the rectifier module and the voltage stabilizing unit, respectively; the rectifier module is specifically used to charge the capacitor unit using the DC signal when the second control signal is obtained; the voltage stabilizing unit is electrically connected to the control module, and is used to output a stable power supply signal according to the initial power supply signal output by the capacitor unit when the first control signal is obtained.

[0016] Optionally, the capacitor unit includes at least one first capacitor, the positive electrode of each first capacitor is electrically connected to the first output end of the rectifier module, and the negative electrode of each first capacitor is grounded; the second output end of the rectifier module is grounded.

[0017] Optionally, the voltage stabilizing unit includes a voltage stabilizing chip, an inductor, a capacitor group, a second resistor, and a third resistor; the input end of the voltage stabilizing chip is electrically connected to the first end of the capacitor unit, the output end of the voltage stabilizing chip is electrically connected to the first end of the inductor, and the enable end of the voltage stabilizing chip is electrically connected to the first end of the second resistor; the second end of the second resistor is electrically connected to the second control end of the control module; the first end of the third resistor is electrically connected to the second end of the second resistor and the second control end of the control module, respectively, and the second end of the third resistor is grounded; the second end of the inductor is electrically connected to the first end of the capacitor group, and the second end of the inductor is used to output the power supply signal; the second end of the capacitor group is grounded, and the capacitor group and the inductor form an inductor-capacitor filter circuit for filtering the power supply signal; the second end of the capacitor unit is grounded.

[0018] Optionally, the capacitor group includes at least one second capacitor, a first end of each second capacitor is electrically connected to a second end of the inductor, and a second end of each second capacitor is grounded.

[0019] Optionally, the control module includes a protocol matching unit and a main control unit; the protocol matching unit is electrically connected to the main control unit, and the protocol matching unit is used to be electrically connected to the induction coil, and when the protocol matching with the external device is successful through the induction coil, the main control unit is powered and the protocol matching is performed with the main control unit; the main control unit is electrically connected to the rectifier module and the power supply module, respectively, and the main control unit is used to send the first control signal to the power supply module when the protocol matching with the protocol matching unit is successful.

[0020] In a second aspect, an embodiment of the utility model provides a smart lock, comprising the wireless power supply circuit as described in the first aspect.

[0021] In an embodiment of the utility model, when an external device is close to the induction coil, the induction coil obtains the electric energy of the external device and outputs an AC signal, which is electrically connected to the induction coil through a control module. When the induction coil is successfully matched with the external device, a first control signal is sent to the power supply module, and the induction coil is electrically connected to the induction coil through a rectifier module to convert the AC signal output by the induction coil into a DC signal. Then, when the power supply module obtains the first control signal, it outputs a power supply signal according to the DC signal to power the smart lock. In this process, the external device powers the smart lock through the induction coil without the need to use the built-in battery of the smart lock. Compared with the prior art, the problem of the smart lock being unusable due to the built-in battery being too low is effectively avoided, thereby improving the stability of the use of the smart lock. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 It is a structural schematic diagram of a wireless power supply circuit provided by an embodiment of the utility model;

[0024] Figure 2 This is a specific structural diagram of a wireless power supply circuit provided by an embodiment of the utility model;

[0025] Figure 3 It is another specific structural schematic diagram of the wireless power supply circuit provided in an embodiment of the utility model.

[0026] Reference numerals:

[0027] 10-control module; 11-protocol matching unit; 12-main control unit; 20-rectifier module; 21-rectifier unit; 22-switch unit; 30-power supply module; 31-capacitor unit; 32-voltage stabilizing unit; 321-capacitor group; U1-voltage stabilizing chip; 40-induction coil; 50-external device; 60-motor. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0029] Reference Figure 1 The embodiment of the utility model provides a wireless power supply circuit, including: a control module 10, a rectifier module 20, and a power supply module 30; the control module 10 is electrically connected to the power supply module 30, and the control module 10 is used to be electrically connected to the induction coil 40, and send a first control signal to the power supply module 30 when the induction coil 40 is successfully matched with the external device; the rectifier module 20 is electrically connected to the power supply module 30, and the rectifier module 20 is used to be electrically connected to the induction coil 40, and convert the AC signal output by the induction coil 40 into a DC signal; the power supply module 30 is used to output a power supply signal according to the DC signal when the first control signal is obtained.

[0030] In some embodiments, the control module 10 is electrically connected to the rectifier module 20 and the power supply module 30, respectively. The control module 10 is used to be electrically connected to the induction coil 40, and when the induction coil 40 is successfully matched with the external device 50, the control module 10 sends a second control signal to the rectifier module 20, and when it is detected that the power supply module 30 is fully charged, the control module 10 sends a first control signal to the power supply module 30; the rectifier module 20 is electrically connected to the power supply module 30, and the rectifier module 20 is used to be electrically connected to the induction coil 40, and when the second control signal is obtained, the AC signal output by the induction coil 40 is converted into a DC signal, and the DC signal is used to charge the power supply module 30; the power supply module 30 is used to output a power supply signal when the first control signal is obtained.

[0031] Specifically, the external device 50 can be a mobile device with a near field communication (NFC) function, such as a mobile phone; the control module 10 has an NFC function, and the control module 10 and the external device 50 interact with each other through the NFC function, and the external device 50 supplies power to the control module 10 through the induction coil 40.

[0032] It should be noted that the induction coil 40 is usually arranged inside the smart lock, and an induction area corresponding to the position of the induction coil 40 is arranged outside the smart lock. When the external device 50 is close to the induction coil 40, it is matched with the control module 10 through the induction coil 40. When the external device 50 and the control module 10 are successfully matched, the external device 50 transfers electrical energy to the induction coil 40 through electromagnetic induction.

[0033] The power supply module 30 is used to be electrically connected to the motor 60 of the smart lock to supply power to the motor 60 of the smart lock, that is, the power supply signal (e.g., a 3.3 volt power supply signal) output by the power supply module 30 is used to supply power to the motor 60 of the smart lock so that the smart lock can work normally; the power supply signal output by the power supply module 30 is also used to provide redundant power supply to the control module 10;

[0034] The control module 10 matches the external device 50 successfully, that is, the protocol matching result between the control module 10 and the external device 50 is successful, and the external device 50 usually sends the protocol matching result to the control module 10; the control module 10 is also used to control the motor 60 to work.

[0035] When it is detected that the power supply module 30 has completed charging, the user can send an unlocking instruction to the control module 10 through the external device 50, and the control module 10 controls the motor 60 of the smart lock to unlock the smart lock.

[0036] In the related art, the power supply of the smart lock is completely dependent on the battery (such as a dry cell or a lithium battery) pre-installed inside the smart lock. During use, users often encounter the dilemma of being unable to unlock the smart lock due to undervoltage of the battery inside the smart lock.

[0037] In an embodiment of the utility model, the external device 50 powers the smart lock through the induction coil 40, and there is no need to use the built-in battery of the smart lock for power supply, thereby avoiding the dilemma of being unable to unlock the smart lock due to undervoltage of the battery inside the smart lock, improving the stability of the smart lock, and eliminating the need to replace the battery, thereby improving the convenience of users using the smart lock.

[0038] In addition, in the related art, the smart lock also uses an external Universal Serial Bus (USB) interface for power supply. Since the external USB interface is exposed to the external environment for a long time and is affected by factors such as temperature, rain, and dust, the power supply fails, affecting the use of the smart lock.

[0039] In the embodiment of the utility model, the external device 50 supplies power to the smart lock through the induction coil 40, and the induction coil 40 is arranged inside the smart lock and will not be affected by factors such as temperature, rain, dust, etc., thereby improving the stability of the use of the smart lock. In addition, there is no need to use a USB interface to unlock the lock through external power supply, thereby improving the convenience of users using the smart lock.

[0040] In an embodiment of the utility model, when the external device 50 is close to the induction coil 40, the induction coil 40 obtains the electric energy of the external device 50 and outputs an AC signal, and is electrically connected to the induction coil 40 through the control module 10. When the induction coil 40 successfully matches the external device 50, a first control signal is sent to the power supply module 30, and the induction coil 40 is electrically connected to the rectifier module 20 to convert the AC signal output by the induction coil 40 into a DC signal. Then, when the power supply module 30 obtains the first control signal, it outputs a power supply signal according to the DC signal to power the smart lock. In this process, the external device 50 powers the smart lock through the induction coil 40 without using the built-in battery of the smart lock. Compared with the prior art, the problem of the smart lock being unusable due to the low power of the built-in battery in the smart lock is effectively avoided, thereby improving the stability of the use of the smart lock.

[0041] Optional, see Figure 2The control module 10 includes a protocol matching unit 11 and a main control unit 12; the protocol matching unit 11 is electrically connected to the main control unit 12, and the protocol matching unit 11 is used to be electrically connected to the induction coil 40, and when the protocol matching with the external device 50 is successful through the induction coil 40, the main control unit 12 is powered and the protocol matching is performed with the main control unit 12; the main control unit 12 is electrically connected to the rectifier module 20 and the power supply module 30 respectively, and the main control unit 12 is used to send the second control signal to the rectifier module 20 when the protocol matching with the protocol matching unit 11 is successful, and send the first control signal to the power supply module 30 when it is detected that the power supply module 30 is fully charged.

[0042] In an embodiment of the utility model, the protocol matching unit 11 is electrically connected to the induction coil 40. When the protocol matching between the induction coil 40 and the external device 50 is successful, the protocol matching is performed with the main control unit 12. When the protocol matching between the main control unit 12 and the protocol matching unit 11 is successful, the second control signal is sent to the rectifier module 20. When it is detected that the charging of the power supply module 30 is completed, the first control signal is sent to the power supply module 30, so that the rectifier module 20 can convert the AC signal output by the induction coil 40 into a DC signal when the second control signal is obtained, and use the DC signal to charge the power supply module 30. Then, when the first control signal is obtained, the power supply module 30 outputs a power supply signal to power the smart lock.

[0043] Specifically, the protocol matching unit 11 includes a long-distance read / write electronic tag chip, such as a long-distance read / write electronic tag chip of model FSV8023; the main control unit 12 includes a main control chip, such as a main control chip of model LS1C103.

[0044] The long-distance read-write electronic tag chip is electrically connected to the main control chip. The long-distance read-write electronic tag chip is used to be electrically connected to the induction coil 40. When the protocol matching with the external device 50 is successful through the induction coil 40, the protocol matching is performed with the main control chip; the main control chip is electrically connected to the rectifier module 20 and the power supply module 30 respectively. When the protocol matching with the long-distance read-write electronic tag chip is successful, the main control chip is used to send a second control signal to the rectifier module 20, and when it is detected that the power supply module 30 is fully charged, the main control chip sends a first control signal to the power supply module 30; the main control chip is also electrically connected to the drive chip of the control motor 60 through the input and output interface. The main control chip is also used to control the drive chip to drive the motor 60 to work by sending a third control signal to the drive chip.

[0045] The external device 50 supplies power to the long-distance read-write electronic tag chip through the induction coil 40, and the long-distance read-write electronic tag chip and the external device 50 are successfully matched through the induction coil 40 protocol, that is, the long-distance read-write electronic tag chip and the external device 50 are successfully matched through the ISO15693 interface protocol of the induction coil 40. When the long-distance read-write electronic tag chip and the external device 50 are successfully matched through the induction coil 40 protocol, the long-distance read-write electronic tag chip and the external device 50 perform signal interaction through the ISO15693 interface protocol.

[0046] The external device 50 sends the result of successful protocol matching between the long-distance read-write electronic tag chip and the external device 50 through the induction coil 40 to the long-distance read-write electronic tag chip. At this time, the long-distance read-write electronic tag chip outputs a power supply signal (for example, a power supply signal with a voltage of 3.3 volts) to power the main control chip. At the same time, the long-distance read-write electronic tag chip and the main control chip perform inter-integrated circuit (I2C) protocol matching. When the long-distance read-write electronic tag chip and the main control chip I2C protocol match successfully, the long-distance read-write electronic tag chip and the main control chip use the I2C protocol to exchange signals. At this time, it is determined that the control module 10 and the external device 50 are matched successfully, and the main control chip sends a second control signal to the rectifier module 20, and when it is detected that the power supply module 30 is fully charged, it sends a first control signal to the power supply module 30.

[0047] It should be noted that the main control unit 12 also includes a detection subunit, which is electrically connected to the power supply module 30 and the main control chip respectively. The detection subunit is used to detect the charging status of the power supply module 30 and send the charging status of the power supply module 30 to the main control chip. When the charging status of the power supply module 30 is that the power supply module 30 is fully charged, the main control chip sends a first control signal to the power supply module 30, and reports the information that the power supply module 30 is fully charged to the external device 50 through long-distance reading and writing of the electronic tag chip and the induction coil 40; when the external device 50 obtains the information that the power supply module 30 is fully charged, it informs the user that unlocking can be performed, and the user sends an unlocking command through the external device 50 (for example, clicking an unlocking button on the touch screen of the external device 50), and the unlocking command is sent to the main control chip through the external device 50, and the main control chip sends a third control signal to the drive chip to control the drive chip to drive the motor 60 to work and unlock the smart lock.

[0048] The power supply signal (eg, a 3.3 volt power supply signal) output by the power supply module 30 is also used to provide redundant power supply for the main control chip.

[0049] Compared with the related art that requires carrying a key that matches the smart lock, the embodiment of the utility model unlocks the smart lock through the external device 50 used by the user, and does not need to use the key that matches the smart lock to unlock, avoiding the dilemma of being unable to unlock due to key loss, and improving the convenience of users using the smart lock. In addition, the embodiment of the utility model first performs protocol matching with the control module 10 in the smart lock through the external device 50 used by the user, and unlocks the smart lock after the matching is successful, making the unlocking safer and more reliable, and does not rely on any remote or short-range network connection, thereby improving the user's unlocking experience.

[0050] For example, through the NFC function of a mobile phone or a handheld device, the NFC identification area close to the smart lock communicates with the control module 10, and the permission verification and wireless power supply functions are completed in conjunction. That is, the smart lock provided by the embodiment of the utility model can realize NFC wireless communication, verification algorithm calculation, electromagnetic energy conversion, and power supply to the locking mechanism, so that the lock body does not carry any power module and traditional communication module, and the management function of the smart lock can also be realized.

[0051] Optional, see Figure 3 The rectifier module 20 comprises a rectifier unit 21 and a switch unit 22; the control module 10 is also electrically connected to the switch unit 22, and the control module 10 is also used to send a second control signal to the switch unit 22 when the induction coil 40 is successfully matched with the external device 50; the rectifier unit 21 is electrically connected to the switch unit 22, and the rectifier unit 21 is used to be electrically connected to the induction coil 40 and convert the AC signal output by the induction coil 40 into a DC signal; the switch unit 22 is electrically connected to the power supply module 30, and the switch unit 22 is used to conduct the rectifier unit 21 with the power supply module 30 when the second control signal is obtained, so that the rectifier unit 21 provides the DC signal to the power supply module (30).

[0052] In an embodiment of the utility model, when the switch unit 22 obtains the second control signal, the rectifier unit 21 is connected to the power supply module 30, so that the rectifier unit 21 uses a DC signal to charge the power supply module 30, so as to power the motor 60 of the smart lock when the power supply module 30 is fully charged.

[0053] Optionally, the rectifier unit 21 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 electrically connected to the cathode of the second diode D2, and the cathode of the first diode D1 is electrically connected to the cathode of the third diode D3 and the first end of the switch unit 22 respectively; the anode of the first diode D1 is also used to be electrically connected to the first end 41 of the induction coil 40; the anode of the second diode D2 is electrically connected to the anode of the fourth diode D4, and the anode of the second diode D2 is grounded; the anode of the second diode D2 is also used to be electrically connected to the first end 41 of the induction coil 40; the anode of the third diode D3 is electrically connected to the anode of the fourth diode D4 The cathode of the third diode D3 is electrically connected to the first end of the switch unit 22; the anode of the third diode D3 is also used to be electrically connected to the second end 42 of the induction coil 40; the anode of the fourth diode D4 is grounded, and the cathode of the fourth diode D4 is also used to be electrically connected to the second end 42 of the induction coil 40; the second end of the switch unit 22 is electrically connected to the first control end 121 of the control module 10, and the third end of the switch unit 22 is electrically connected to the first end of the power supply module 30; the second end of the power supply module 30 is grounded, the third end of the power supply module 30 is electrically connected to the second control end 122 of the control module 10, and the fourth end of the power supply module 30 is used to output the power supply signal.

[0054] It should be noted that the voltage of the DC signal output by the rectifier unit 21 (for example, 25V) cannot be directly provided to the motor 60 of the smart lock, but needs to be converted by the power supply module 30 to provide a power supply signal with an adaptive voltage to the motor 60 of the smart lock.

[0055] In the embodiment of the utility model, the first diode D1, the second diode D2, the third diode D3, and the fourth diode D4 form a bridge rectifier circuit for converting the AC signal output by the induction coil 40 into a DC signal, and using the DC signal to charge the power supply module 30.

[0056] Optionally, the rectifier module 20 further includes a fifth diode D5, an anode of the fifth diode D5 is grounded, and a cathode of the fifth diode D5 is electrically connected to a cathode of the first diode D1 and a cathode of the third diode D3, respectively.

[0057] In the embodiment of the present invention, the fifth diode D5 can stabilize the voltage of the direct current signal output by the rectifying unit 21 .

[0058] Optionally, the switch unit 22 includes a MOS tube Q1 and a first resistor R1; the source of the MOS tube Q1 is electrically connected to the first output end of the rectifier unit 21, the drain of the MOS tube Q1 is electrically connected to the first end of the power supply module 30, and the gate of the MOS tube Q1 is electrically connected to the first end of the first resistor R1; the second end of the first resistor R1 is electrically connected to the first control end 121 of the control module 10; the second output end of the rectifier unit 21 is grounded; the second end of the power supply module 30 is grounded, the third end of the power supply module 30 is electrically connected to the second control end 122 of the control module 10, and the fourth end of the power supply module 30 is used to output the power supply signal.

[0059] It should be noted that the type of the MOS tube Q1 is a PMOS tube; the first end of the switch unit 22 is the source of the MOS tube Q1, the second end of the switch unit 22 is the second end of the first resistor R1, and the third end of the switch unit 22 is the drain of the MOS tube Q1; the first output end of the rectifier unit 21 includes the cathode of the first diode D1 and the cathode of the third diode D3, and the second output end of the rectifier unit 21 includes the anode of the second diode D2 and the anode of the fourth diode D4; the first control end 121 of the control module 10 is the first output end of the main control chip.

[0060] Specifically, the source of the MOS tube Q1 is electrically connected to the cathode of the first diode D1 and the cathode of the third diode D3 respectively; the second end of the first resistor R1 is electrically connected to the first output end of the main control chip.

[0061] In an embodiment of the utility model, when the first output terminal of the main control chip outputs a high-level fourth control signal, the MOS tube Q1 is disconnected, so that the rectifier unit 21 is disconnected from the power supply module 30; when the first output terminal of the main control chip outputs a low-level second control signal, the MOS tube Q1 is turned on, so that the rectifier unit 21 is turned on from the power supply module 30, and the rectifier unit 21 converts the AC signal output by the induction coil 40 into a DC signal, and uses the DC signal to charge the power supply module 30.

[0062] Optionally, the power supply module 30 includes a capacitor unit 31 and a voltage stabilizing unit 32; the capacitor unit 31 is electrically connected to the rectifier module 20 and the voltage stabilizing unit 32, respectively; the rectifier module 20 is specifically used to charge the capacitor unit 31 using the DC signal when the second control signal is obtained; the voltage stabilizing unit 32 is electrically connected to the control module 10, and is used to output a stable power supply signal according to the initial power supply signal output by the capacitor unit 31 when the first control signal is obtained.

[0063] It should be noted that the capacitor unit 31 is used to store electrical energy; in some embodiments, the voltage stabilizing unit 32 is specifically used to reduce the voltage of the initial power supply signal output by the capacitor unit 31 and output a stable power supply signal.

[0064] In an embodiment of the utility model, when the rectifier module 20 obtains the second control signal, a DC signal is used to charge the capacitor unit 31. When the voltage stabilizing unit 32 obtains the first control signal, it outputs a stable power supply signal according to the initial power supply signal output by the capacitor unit 31 to power the smart lock.

[0065] Optionally, the capacitor unit 31 includes at least one first capacitor, the positive electrode of each first capacitor is electrically connected to the first output end of the rectifier module 20, and the negative electrode of each first capacitor is grounded; the second output end of the rectifier module 20 is grounded.

[0066] It should be noted that the first output end of the rectifier module 20 is the drain of the MOS tube Q1, the second output end of the rectifier module 20 includes the positive electrode of the second diode D2 and the positive electrode of the fourth diode D4, the first end of the power supply module 30 includes the positive electrode of each first capacitor, and the second end of the power supply module 30 includes the negative electrode of each first capacitor.

[0067] Specifically, the drain of the MOS tube Q1 is electrically connected to the positive electrode of each first capacitor.

[0068] The capacitance value of each first capacitor in the capacitor unit 31 is different or the same, or the capacitance values ​​of a part of the first capacitors in the capacitor unit 31 are the same.

[0069] In some embodiments, the capacitor unit 31 includes two first capacitors connected in parallel, namely a first capacitor CE1 and a first capacitor CE2.

[0070] In the embodiment of the present invention, each first capacitor in the capacitor unit 31 can store electrical energy.

[0071] Optionally, the voltage stabilizing unit 32 includes a voltage stabilizing chip U1, an inductor L1, a capacitor group 321, a second resistor R2, and a third resistor R3; the input terminal U1-3 of the voltage stabilizing chip U1 is electrically connected to the first end of the capacitor unit 31, the output terminal U1-2 of the voltage stabilizing chip U1 is electrically connected to the first end of the inductor L1, and the enable terminal U1-5 of the voltage stabilizing chip U1 is electrically connected to the first end of the second resistor R2; the second end of the second resistor R2 is electrically connected to the second control terminal 122 of the control module 10; the first The first ends of the three resistors R3 are electrically connected to the second end of the second resistor R2 and the second control end 122 of the control module 10, respectively, and the second end of the third resistor R3 is grounded; the second end of the inductor L1 is electrically connected to the first end of the capacitor group 321, and the second end of the inductor L1 is used to output the power supply signal; the second end of the capacitor group 321 is grounded, and the capacitor group 321 and the inductor L1 form an inductor L1 capacitor filter circuit for filtering the power supply signal; the second end of the capacitor unit 31 is grounded.

[0072] It should be noted that the first end of the capacitor unit 31 includes the positive electrode of each first capacitor, and the second end of the capacitor unit 31 includes the negative electrode of each first capacitor; the second control end 122 of the control module 10 is the second output end of the main control chip.

[0073] The second resistor R2 is a current limiting resistor, and the third resistor R3 is a pull-down resistor.

[0074] Specifically, the positive electrode of each first capacitor is electrically connected to the input terminal U1-3 of the voltage regulator chip U1, the second end of the second resistor R2 and the first end of the third resistor R3 are respectively electrically connected to the second output terminal of the main control chip, and the second end of the inductor L1 is used to be electrically connected to the motor 60 of the smart lock.

[0075] In some embodiments, the voltage stabilizing chip U1 may be a step-down voltage stabilizing chip with a DC converter (DCDC) function, and the model of the voltage stabilizing chip U1 may be TPS54302; the voltage stabilizing unit 32 further includes a fourth resistor R4, a fifth resistor R5, a third capacitor C3, and a fourth capacitor C4, wherein a first end of the fourth resistor R4 is electrically connected to a feedback end U1-4 of the voltage stabilizing chip U1, and a second end of the fourth resistor R4 is electrically connected to a first end of the capacitor group 321, a second end of the inductor L1, and a first end of the fifth resistor R5; a second end of the fifth resistor R5 Grounded; the first end of the third capacitor C3 is electrically connected to the feedback end U1-4 of the voltage stabilizing chip U1, the second end of the fourth resistor R4, and the first end of the fifth resistor R5, respectively; the second end of the third capacitor C3 is electrically connected to the first end of the fourth resistor R4, the first end of the capacitor group 321, and the second end of the inductor L1; the first end of the fourth capacitor C4 is electrically connected to the bootstrap end U1-6 of the voltage stabilizing chip U1, and the second end of the fourth capacitor C4 is electrically connected to the first end of the inductor L1 and the output end U1-2 of the voltage stabilizing chip U1; the grounding terminal U1-1 of the voltage stabilizing chip U1 is grounded.

[0076] It should be noted that the fourth resistor R4 and the third capacitor C3 group 321 form a resistor-capacitor (RC) circuit to filter the power supply signal output from the second end of the inductor L1; the fifth resistor R5 is a voltage divider resistor; and the fourth capacitor C4 is a bootstrap capacitor.

[0077] In an embodiment of the utility model, when the voltage stabilizing chip U1 outputs a high-level first control signal (i.e., an enable signal of the voltage stabilizing chip U1) at the second output terminal of the main control chip, the initial power supply signal output by the capacitor unit 31 is converted into a stable power supply signal and output to power the smart lock.

[0078] Optionally, the capacitor group 321 includes at least one second capacitor, a first end of each second capacitor is electrically connected to the second end of the inductor L1, and a second end of each second capacitor is grounded.

[0079] It should be noted that the first end of the capacitor group 321 includes the first end of each second capacitor, and the second end of the capacitor group 321 includes the second end of each second capacitor.

[0080] The capacitance value of each second capacitor in the capacitor group 321 is different or the same, or the capacitance values ​​of a part of the second capacitors in the capacitor group 321 are the same.

[0081] In some embodiments, the capacitor group 321 includes two second capacitors connected in parallel, namely a second capacitor C1 and a second capacitor C2.

[0082] In the embodiment of the utility model, the second capacitor in the capacitor group 321 and the inductor L1 form an inductor L1 capacitor (LC) filter circuit to filter the power supply signal.

[0083] An embodiment of the utility model provides a smart lock, comprising the aforementioned wireless power supply circuit.

[0084] It should be noted that the smart lock provided in the embodiment of the utility model has a completely enclosed lock shell, which effectively prevents the lock from being affected by special environments such as severe cold, heat, humidity, dust, etc. when used outdoors.

[0085] The specific implementation process of the wireless power supply circuit in the smart lock is similar to the implementation process of the aforementioned wireless power supply circuit, and will not be repeated here.

[0086] To sum up, in an embodiment of the utility model, when the external device 50 is close to the induction coil 40, the induction coil 40 obtains the electric energy of the external device 50 and outputs an AC signal, and is electrically connected to the induction coil 40 through the control module 10. When the induction coil 40 successfully matches the external device 50, a first control signal is sent to the power supply module 30, and the induction coil 40 is electrically connected to the rectifier module 20 to convert the AC signal output by the induction coil 40 into a DC signal. Then, when the power supply module 30 obtains the first control signal, it outputs a power supply signal according to the DC signal to power the smart lock. In this process, the external device 50 powers the smart lock through the induction coil 40 without using the built-in battery of the smart lock. Compared with the prior art, the problem of the smart lock being unusable due to the low power of the built-in battery of the smart lock is effectively avoided, thereby improving the stability of the use of the smart lock.

[0087] Finally, it should be noted that, in this article, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "includes" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or terminal device that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements that are inherent to such process, method, article or terminal device.

[0088] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0089] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A wireless power supply circuit, characterized in that: include: A control module (10), a rectifier module (20), and a power supply module (30); The control module (10) is electrically connected to the power supply module (30), and the control module (10) is used to be electrically connected to the induction coil (40), and to send a first control signal to the power supply module (30) when the induction coil (40) is successfully matched with the external device (50); The rectifier module (20) is electrically connected to the power supply module (30), and the rectifier module (20) is used to be electrically connected to the induction coil (40) and convert the alternating current signal output by the induction coil (40) into a direct current signal; The power supply module (30) is used to output a power supply signal according to the direct current signal when the first control signal is acquired.

2. The wireless power supply circuit according to claim 1, characterized in that: The rectifier module (20) comprises a rectifier unit (21) and a switch unit (22); The control module (10) is also electrically connected to the switch unit (22), and the control module (10) is also used to send a second control signal to the switch unit (22) when the induction coil (40) is successfully matched with the external device (50); The rectifier unit (21) is electrically connected to the switch unit (22), and the rectifier unit (21) is used to be electrically connected to the induction coil (40) and convert the alternating current signal output by the induction coil (40) into a direct current signal; The switch unit (22) is electrically connected to the power supply module (30), and the switch unit (22) is used to connect the rectifier unit (21) and the power supply module (30) when the second control signal is obtained, so that the rectifier unit (21) provides the power supply module (30) with the direct current signal.

3. The wireless power supply circuit according to claim 2, characterized in that: The rectifying unit (21) comprises 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 electrically connected to the cathode of the second diode (D2), and the cathode of the first diode (D1) is electrically connected to the cathode of the third diode (D3) and the first end of the switch unit (22) respectively; the anode of the first diode (D1) is also used to be electrically connected to the first end (41) of the induction coil (40); The anode of the second diode (D2) is electrically connected to the anode of the fourth diode (D4), and the anode of the second diode (D2) is grounded; the anode of the second diode (D2) is also used to electrically connect to the first end (41) of the induction coil (40); The anode of the third diode (D3) is electrically connected to the cathode of the fourth diode (D4), and the cathode of the third diode (D3) is electrically connected to the first end of the switch unit (22); the anode of the third diode (D3) is also used to be electrically connected to the second end (42) of the induction coil (40); The anode of the fourth diode (D4) is grounded, and the cathode of the fourth diode (D4) is also used to be electrically connected to the second end (42) of the induction coil (40); The second end of the switch unit (22) is electrically connected to the first control end (121) of the control module (10), and the third end of the switch unit (22) is electrically connected to the first end of the power supply module (30); The second end of the power supply module (30) is grounded, the third end of the power supply module (30) is electrically connected to the second control end (122) of the control module (10), and the fourth end of the power supply module (30) is used to output the power supply signal.

4. The wireless power supply circuit according to claim 3, characterized in that: The rectifier module (20) further comprises a fifth diode (D5), the anode of the fifth diode (D5) being grounded, and the cathode of the fifth diode (D5) being electrically connected to the cathode of the first diode (D1) and the cathode of the third diode (D3) respectively.

5. The wireless power supply circuit according to claim 2, characterized in that: The switch unit (22) comprises a MOS tube (Q1) and a first resistor (R1); The source of the MOS tube (Q1) is electrically connected to the first output end of the rectifying unit (21), the drain of the MOS tube (Q1) is electrically connected to the first end of the power supply module (30), and the gate of the MOS tube (Q1) is electrically connected to the first end of the first resistor (R1); The second end of the first resistor (R1) is electrically connected to the first control end (121) of the control module (10); The second output terminal of the rectifying unit (21) is grounded; The second end of the power supply module (30) is grounded, the third end of the power supply module (30) is electrically connected to the second control end (122) of the control module (10), and the fourth end of the power supply module (30) is used to output the power supply signal.

6. The wireless power supply circuit according to claim 1, characterized in that: The control module (10) is also electrically connected to the rectifier module (20), and the control module (10) is specifically configured to send a second control signal to the rectifier module (20) when the induction coil (40) is successfully matched with the external device (50), and to send the first control signal to the power supply module (30) when it is detected that the power supply module (30) has completed charging; The rectifier module (20) is specifically used to convert the alternating current signal output by the induction coil (40) into the direct current signal when the second control signal is obtained, and use the direct current signal to charge the power supply module (30).

7. The wireless power supply circuit according to claim 6, characterized in that: The power supply module (30) comprises a capacitor unit (31) and a voltage stabilizing unit (32); The capacitor unit (31) is electrically connected to the rectifier module (20) and the voltage stabilizing unit (32) respectively; The rectifier module (20) is specifically configured to use the direct current signal to charge the capacitor unit (31) when the second control signal is acquired; The voltage stabilizing unit (32) is electrically connected to the control module (10) and is used to output a stable power supply signal according to the initial power supply signal output by the capacitor unit (31) when the first control signal is acquired.

8. The wireless power supply circuit according to claim 7, characterized in that: The capacitor unit (31) comprises at least one first capacitor, the positive electrode of each first capacitor is electrically connected to the first output end of the rectifier module (20), and the negative electrode of each first capacitor is grounded; The second output end of the rectifier module (20) is grounded.

9. The wireless power supply circuit according to claim 7, characterized in that: The voltage stabilizing unit (32) comprises a voltage stabilizing chip (U1), an inductor (L1), a capacitor group (321), a second resistor (R2), and a third resistor (R3); The input end (U1-3) of the voltage stabilizing chip (U1) is electrically connected to the first end of the capacitor unit (31), the output end (U1-2) of the voltage stabilizing chip (U1) is electrically connected to the first end of the inductor (L1), and the enable end (U1-5) of the voltage stabilizing chip (U1) is electrically connected to the first end of the second resistor (R2); The second end of the second resistor (R2) is electrically connected to the second control end (122) of the control module (10); The first end of the third resistor (R3) is electrically connected to the second end of the second resistor (R2) and the second control end (122) of the control module (10), respectively, and the second end of the third resistor (R3) is grounded; The second end of the inductor (L1) is electrically connected to the first end of the capacitor group (321), and the second end of the inductor (L1) is used to output the power supply signal; The second end of the capacitor group (321) is grounded, and the capacitor group (321) and the inductor (L1) form an inductor (L1) capacitor filter circuit for filtering the power supply signal; the second end of the capacitor unit (31) is grounded.

10. The wireless power supply circuit according to claim 9, characterized in that: The capacitor group (321) includes at least one second capacitor, a first end of each second capacitor is electrically connected to the second end of the inductor (L1), and a second end of each second capacitor is grounded.

11. The wireless power supply circuit according to claim 1, characterized in that: The control module (10) comprises a protocol matching unit (11) and a main control unit (12); The protocol matching unit (11) is electrically connected to the main control unit (12), and the protocol matching unit (11) is used to be electrically connected to the induction coil (40), and when the protocol matching between the induction coil (40) and the external device (50) is successful, the main control unit (12) is powered and protocol matching is performed with the main control unit (12); The main control unit (12) is electrically connected to the rectifier module (20) and the power supply module (30) respectively, and the main control unit (12) is used to send the first control signal to the power supply module (30) when a protocol match with the protocol matching unit (11) is successful.

12. A smart lock, characterized in that: The wireless power supply device comprises the wireless power supply circuit as claimed in any one of claims 1 to 11.

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