Power supply circuit for door lock and door lock

Abstract

The utility model relates to the technical field of intelligent door locks, and discloses a power supply circuit for a door lock and the door lock. The power supply circuit for the door lock comprises a charging management control circuit which is connected with a first battery and a second battery; the booster circuit is connected with the second battery; the power supply access selection circuit is respectively connected with the door lock system, the first battery and the booster circuit; wherein the rated voltage of the second battery is smaller than that of the first battery. The charging control management circuit can control the first battery to charge the second battery to improve the electric quantity of the second battery. Under the condition that the first battery is high in electric quantity and is normally installed, the power supply access selection circuit selects the first battery to supply power to the door lock; and under the condition that the first battery is taken down to be charged due to low electric quantity, the power supply access selection circuit selects the second battery to supply power to the door lock through the booster circuit. And the first battery or the second battery is selected to supply power to the door lock under different conditions, so that the stability of the door lock power supply system is improved.

Description

Technical Field

[0001] This application relates to the technical field of intelligent door locks, for example, to a power supply circuit and a door lock for a door lock. Background Art

[0002] An intelligent door lock is an intelligent lock control system installed on a door, which consists of front and rear lock body panels, including a main control circuit board, a display screen, a fingerprint module, a face recognition module, a radar, a semi-automatic or fully automatic lock body, and a mechanical door lock structure, etc. The door lock opens by entering a password or biometric information such as face, fingerprint, palm print, etc., and is connected to the Internet through WIFI wireless communication. Information such as the door lock status and the scene in front of the door is transmitted to intelligent product terminals such as mobile phones through wireless communication, thus replacing the traditional mechanical door lock and realizing a more convenient and intelligent door opening experience and intelligent control. Compared with the traditional mechanical door lock, the intelligent door lock needs to implement the control and reporting of the door lock opening and closing through an electronic control solution, and the stability and reliability of the power supply system have also become an important part of the user experience.

[0003] In the related art, a lithium battery power supply solution is adopted, and the long-term power supply of the door lock is realized through the relatively large battery capacity of the lithium battery.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

[0005] When the lithium battery runs out of power and is removed for charging, the door lock cannot be used normally, and there is a problem of unstable power supply system for the door lock.

[0006] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute the prior art known to those of ordinary skill in the art. Utility Model Content

[0007] To have a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. This summary is not a general review, nor is it intended to identify key / important constituent elements or delineate the protection scope of these embodiments, but rather serves as a preface to the subsequent detailed description.

[0008] The embodiments of the present disclosure provide a power supply circuit and a door lock for a door lock to improve the stability of the door lock power supply system.

[0009] In some embodiments, the power supply circuit for a door lock includes: a charging management control circuit connected to the first battery and the second battery respectively; a boost circuit connected to the second battery; a power supply path selection circuit connected to the door lock system, the first battery, and the boost circuit respectively; wherein, the rated voltage of the second battery is less than the rated voltage of the first battery.

[0010] Optionally, the charging management control circuit includes: a charging circuit connected to the second battery; a charging management chip connected to the first battery and the charging circuit respectively; and an MCU control circuit connected to the first battery and the charging management chip respectively.

[0011] Optionally, the charging management control circuit further includes: a USB power supply circuit connected to the charging management chip.

[0012] Optionally, the charging management chip includes an FS5175AE charging management chip.

[0013] Optionally, the boost circuit includes: a boost chip connected to the second battery; and a voltage dividing circuit connected to the boost chip and the power supply path selection circuit respectively.

[0014] Optionally, the boost chip includes an RY3710 boost chip.

[0015] Optionally, the power supply path selection circuit includes: a first power supply path connected to the first battery and the door lock system respectively; and a second power supply path connected to the first battery, the boost circuit and the door lock system respectively.

[0016] Optionally, the second power supply path includes: a control circuit connected to the first battery; and a switch circuit connected to the control circuit, the boost circuit and the door lock system respectively.

[0017] Optionally, the power supply circuit further includes: an alarm device connected to the first battery.

[0018] In some embodiments, the door lock includes: a power supply circuit for the door lock as described above.

[0019] The power supply circuit and the door lock for the door lock provided by the embodiments of the present disclosure can achieve the following technical effects:

[0020] The power supply circuit for a door lock provided by an embodiment of the present disclosure includes a charging management circuit, a boost circuit, and a power supply path selection circuit. The charging management control circuit is respectively connected to a first battery and a second battery. The boost circuit is connected to the second battery. The power supply path selection circuit is respectively connected to the door lock system, the first battery, and the boost circuit. The rated voltage of the second battery is less than that of the first battery. When the power level of the second battery is lower than a preset power level, the charging control management circuit controls the first battery to charge the second battery to increase the power level of the second battery. The boost circuit can increase the output voltage of the second battery so that the output voltage can supply power to the door lock system. The power supply path selection circuit can select one of the voltages of the first battery and the boost circuit to supply power to the door lock system. When the first battery has a high power level and operates normally, the power supply path selection circuit selects the first battery to supply power to the door lock system; when the first battery has a low power level and is removed for charging, the power supply path selection circuit selects the second battery, and through the boost circuit, supplies power to the door lock system. In this way, the door lock can also be powered by the second battery when the first battery is removed for charging, ensuring the normal use of the door lock in different situations and improving the stability of the door lock power supply system.

[0021] The above general description and the following description are only exemplary and explanatory, and are not used to limit this application. Description of the Drawings

[0022] One or more embodiments are exemplarily illustrated by corresponding drawings. These exemplary illustrations and the drawings do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation, and among them:

[0023] Figure 1 is a structural block diagram of a power supply circuit for a door lock provided by an embodiment of the present disclosure;

[0024] Figure 2 is a circuit diagram of a charging management control circuit in a power supply circuit for a door lock provided by an embodiment of the present disclosure;

[0025] Figure 3 is a circuit diagram of a boost circuit in a power supply circuit for a door lock provided by an embodiment of the present disclosure;

[0026] Figure 4 is a circuit diagram of a power supply path selection circuit in a power supply circuit for a door lock provided by an embodiment of the present disclosure.

[0027] Reference numerals: 10, first battery; 20, second battery; 30, charging management control circuit; 31, charging circuit; 32, charging management chip; 33, MCU control circuit; 34, USB power supply circuit; 40, boost circuit; 41, boost chip; 42, voltage dividing circuit; BST, boost circuit output terminal; 50, power supply path selection circuit; 51, first power supply path; 52, second power supply path; 521, control circuit; 522, switching circuit; 60, door lock system; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; R6, sixth resistor; R7, seventh resistor; R8, eighth resistor; R9, ninth resistor; R10, tenth resistor; R11, eleventh resistor; R12, twelfth resistor; R13, thirteenth resistor; R14, fourteenth resistor; R15, fifteenth resistor; R16, sixteenth resistor; C1, first capacitor; C2, second capacitor; C3, third capacitor; C4, fourth capacitor; C5, fifth capacitor; C6, sixth capacitor; C7, seventh capacitor; C8, eighth capacitor; C9, ninth capacitor; C10, tenth capacitor; C11, eleventh capacitor; C12, twelfth capacitor; C13, thirteenth capacitor; C14, fourteenth capacitor; C15, fifteenth capacitor; Q1, first PMOS transistor; Q2, first triode; Q3, second PMOS transistor; Q4, second triode; D1, first diode; D2, second diode; D3, third diode; D4, fourth diode; D5, fifth diode; L1, first inductor; L2, second inductor. Detailed implementation manners

[0028] In order to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference and illustration only and are not intended to limit the embodiments of the present disclosure. In the following technical description, for the sake of explanation, numerous details are provided to give a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be shown in a simplified manner to simplify the drawings.

[0029] The terms "first", "second", etc. in the description and claims of the embodiments of the present disclosure and the above accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data may be interchanged where appropriate so as to implement the embodiments of the present disclosure described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0030] In the embodiments of the present disclosure, the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "middle", "outer", "front", and "back" is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the embodiments of the present disclosure and their embodiments, and are not used to limit that the indicated devices, elements, or components must have a specific orientation, or be constructed and operated in a specific orientation. Moreover, in addition to being able to represent an orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0031] In addition, the terms "arrangement", "connection", and "fixation" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0032] Unless otherwise specified, the term "plurality" means two or more.

[0033] In the embodiments of the present disclosure, the character " / " indicates that the objects before and after are in an "or" relationship. For example, A / B means: A or B.

[0034] The term "and / or" is an associative relationship describing an object, indicating that there can be three relationships. For example, A and / or B means: A or B, or, A and B these three relationships.

[0035] It should be noted that, without conflict, the embodiments in the embodiments of the present disclosure and the features in the embodiments can be combined with each other.

[0036] Combined Figure 1 As shown, the embodiments of the present disclosure provide a power supply circuit for a door lock, including a charging management control circuit 30, a boost circuit 40, and a power supply path selection circuit 50.

[0037] The charging management control circuit 30 is respectively connected to the first battery 10 and the second battery 20. The boost circuit 40 is connected to the second battery 20. The power supply path selection circuit 50 is respectively connected to the door lock system 60, the first battery 10, and the boost circuit 40. Among them, the rated voltage of the second battery 20 is less than the rated voltage of the first battery 10.

[0038] When the power level of the second battery 20 is lower than the preset power level, the charging control management circuit controls the first battery 10 to charge the second battery 20, thereby increasing the power level of the second battery 20. The boost circuit 40 can increase the output voltage of the second battery 20 so that the output voltage can supply power to the door lock system 60. The power supply path selection circuit 50 can select one of the voltages from the first battery 10 and the boost circuit 40 to supply power to the door lock system 60. When the first battery 10 has a high power level and is operating normally, the power supply path selection circuit 50 selects the first battery 10 to supply power to the door lock system 60; when the first battery 10 has a low power level and is removed for charging, the power supply path selection circuit 50 selects the second battery 20, and supplies power to the door lock system 60 through the boost circuit 40. In this way, the door lock can be powered by the second battery 20 even when the first battery 10 is removed for charging, ensuring the normal use of the door lock in different situations and improving the stability of the door lock power supply system.

[0039] In the embodiments of the present disclosure, taking the rated voltage of the first battery 10 as 7.4V and the rated voltage of the second battery 20 as 3.7V as an example, the power supply circuit will be described.

[0040] Optionally, the first battery 10 includes a large-capacity removable lithium battery; the second battery 20 includes a small-capacity non-removable battery.

[0041] The first battery 10 with a rated voltage of 7.4V can provide a voltage of 6 to 8.4V and serves as the main power supply battery for the door lock system 60. The second battery 20 with a rated voltage of 3.7V can provide a voltage of 3 to 4.2V and serves as the auxiliary power supply battery for the door lock system 60. Through the cooperation of the charging management control circuit 30, the boost circuit 40, and the power supply path selection circuit 50, dual lithium battery power supply is achieved. When the first battery 10 is normally installed and has sufficient power, the door lock system 60 is powered by the 7.4V first battery 10, and at the same time, the first battery 10 powers the second battery 20 to ensure that the power level of the second battery 20 is higher than the preset power level, for example, higher than 80% of the full power level. When the first battery 10 is removed for charging or runs out of power, the door lock system 60 switches to being powered by the second battery 20, and the second battery 20 supplies power to the door lock system 60 after being boosted by the boost circuit 40.

[0042] Optionally, the charging management control circuit 30 includes a charging circuit 31, a charging management chip 32, and an MCU control circuit 33. The charging circuit 31 is connected to the second battery 20. The charging management chip 32 is respectively connected to the first battery 10 and the charging circuit 31. The MCU control circuit 33 is respectively connected to the first battery 10 and the charging management chip 32.

[0043] When the power of the second battery 20 is low, the MCU control circuit 33 can control the connection between the first battery 10 and the charging management chip 32, so that the first battery 10 charges the second battery 20 through the charging management chip 32 and the charging circuit 31. When the power of the second battery 20 is high, it controls the disconnection between the first battery 10 and the charging management chip 32 to stop charging the second battery 20.

[0044] Optionally, the charging management control circuit 30 further includes a USB power supply circuit 34. The USB power supply circuit 34 is connected to the charging management chip 32.

[0045] In this embodiment, when the first battery 10 is removed for charging, an external power adapter or a power bank can be directly used to charge the second battery 20, avoiding charging the second battery 20 after the first battery 10 is fully charged and installed in the door lock system 60, which can extend the usage time of the first battery 10.

[0046] Optionally, the charging management chip 32 includes an FS5175AE charging management chip.

[0047] The FS5175AE charging management chip supports a wide voltage input range from 5V to 24V, can be used for the charging management of 1 to 4 second batteries 20, adapts to various power environments, and can provide stable charging current and voltage.

[0048] Optionally, in a specific embodiment, in combination with Figure 2As shown, the charging management control circuit 30 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a first PMOS transistor Q1, a first triode Q2, a first diode D1, a second diode D2, a first inductor L1, and a charging management chip 32. Among them, the first end of the third capacitor C3, the first end of the fourth capacitor C4, the first end of the fourth resistor R4, and the source electrode of the first PMOS transistor Q1 are all connected to the first battery 10. The second end of the third capacitor C3 is grounded. The second end of the fourth capacitor C4, the second end of the fourth resistor R4, and the first end of the sixth resistor R6 are all connected to the gate of the first PMOS transistor Q1. The second end of the sixth resistor R6 is connected to the collector of the first triode Q2. The emitter of the first triode Q2 is grounded. The base of the first triode Q2 is respectively connected to the first end of the eighth resistor R8 and the first end of the ninth resistor R9. The second end of the eighth resistor R8 is connected to the CHG terminal of the MCU chip. The second end of the ninth resistor R9 is grounded. The drain of the first PMOS transistor Q1, the first end of the sixth capacitor C6, the first end of the eighth capacitor C8, and the negative electrode of the first diode D1 are all connected to the IN terminal of the charging management chip 32. The second end of the sixth capacitor C6 is grounded. The second end of the eighth capacitor C8 is grounded. The positive electrode of the first diode D1 is connected to the USB interface. The SATA terminal of the charging management chip 32 is connected to the first end of the second resistor R2. The second end of the second resistor R2 is connected to the SATA terminal of the MCU chip. The TS terminal of the charging management chip 32 is respectively connected to the first end of the fifth resistor R5 and the first end of the ninth capacitor C9. The second end of the fifth resistor R5 is grounded. The second end of the ninth capacitor C9 is grounded. The CELL terminal of the charging management chip 32 is connected to the first end of the seventh resistor R7. The second end of the seventh resistor R7 is grounded. The BS terminal of the charging management chip 32 is connected to the first end of the second capacitor C2. The second end of the second capacitor C2, the first end of the first resistor R1, the negative electrode of the second diode D2, and the first end of the first inductor L1 are all connected to the LX terminal of the charging management chip 32. 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 grounded. The positive electrode of the second diode D2 is grounded. The second end of the first inductor L1, the first end of the third resistor R3, and the first end of the tenth capacitor C10 are all connected to the CS terminal of the charging management chip 32. The second end of the tenth capacitor C10 is grounded. The second end of the third resistor R3, the first end of the eleventh capacitor C11, the BAT terminal of the charging management chip 32, the first end of the fifth capacitor C5, and the first end of the seventh capacitor C7 are all connected to the second battery 20. The second end of the eleventh capacitor C11 is grounded.The second terminal of the fifth capacitor C5 is grounded. The second terminal of the seventh capacitor C7 is grounded.

[0049] In this embodiment, when the first battery 10 is properly installed and has a certain amount of power, the circuit system detects the power of the second battery 20. When the power of the second battery 20 is lower than the preset power, the MCU chip sends a high-level signal at the CHG terminal, making the base of the first triode Q2 at a high level, thereby turning on the first triode Q2. At this time, the gate of the first PMOS transistor Q1 is grounded and at a low level, thereby turning on the first PMOS transistor Q1, connecting the first battery 10 to the charging management chip 32, and then charging the second battery 20. After charging is completed, the charging management chip 32 pulls up the pin at the SATA terminal. At this time, the MCU chip detects a high-level signal at the SATA terminal and makes the CHG terminal send a low-level signal to turn off the first triode Q2, and then turn off the first PMOS transistor Q1 to stop charging.

[0050] Optionally, in combination with Figure 3 As shown, the boost circuit 40 includes a boost chip 41 and a voltage dividing circuit 42. The boost chip 41 is connected to the second battery 20. The voltage dividing circuit 42 is respectively connected to the boost chip 41 and the power supply path selection circuit 50.

[0051] In this embodiment, since the rated voltage of the second battery 20 is less than the rated voltage of the first battery 10, it is necessary to boost the output voltage of the second battery 20 through the boost chip 41 before it can supply power to the door lock system 60. In addition, the output voltage of the boost chip 41 can also be adjusted through the voltage dividing circuit 42, further improving the stability of the power supply system.

[0052] Optionally, the boost chip 41 includes the RY3710 boost chip.

[0053] The RY3710 boost chip is a highly efficient, compact and highly integrated boost converter. The RY3710 supports an input voltage of 2.3V to 12V, an output voltage of up to 28V, and a maximum output current of 4A. The RY3710 is internally compensated and does not require external components to achieve stable operation, and the circuit is simple.

[0054] Optionally, in a specific embodiment, in combination with Figure 3As shown in the figure, the boost circuit 40 includes: the eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13, the fourteenth capacitor C14, the fifteenth capacitor C15, the fifth diode D5, the second inductor L2, and the boost chip 41. Among them, the first end of the twelfth resistor R12, the first end of the fifteenth capacitor C15, the IN terminal of the boost chip 41, and the first end of the second inductor L2 are all connected to the second battery 20. The second end of the twelfth resistor R12 is connected to the EN terminal of the boost chip 41. The second end of the fifteenth capacitor C15 is grounded. The second end of the second inductor L2 and the SW terminal of the boost chip 41 are both connected to the positive electrode of the fifth diode D5. The GND terminal of the boost chip 41 is grounded. The FB terminal of the boost chip 41 is respectively connected to the first end of the eleventh resistor R11 and the first end of the thirteenth resistor R13. The second end of the thirteenth resistor R13 is grounded. The second end of the eleventh resistor R11, the negative electrode of the fifth diode D5, and the first end of the fourteenth capacitor C14 are connected, serving as the output terminal BST of the boost circuit, and are connected to the power supply path selection circuit 50. The second end of the fourteenth capacitor C14 is grounded.

[0055] In this embodiment, after the boost chip 41 boosts the voltage of the second battery 20 input at the IN terminal, it outputs the boosted voltage at the FB terminal. Then, it is divided by the voltage dividing resistors, the eleventh resistor R11 and the thirteenth resistor R13, to output a voltage that meets the power supply requirements of the door lock system 60.

[0056] Optionally, in combination with Figure 4 As shown in the figure, the power supply path selection circuit 50 includes: the first power supply path 51, which is respectively connected to the first battery 10 and the door lock system 60; the second power supply path 52, which is respectively connected to the first battery 10, the boost circuit 40, and the door lock system 60.

[0057] In this embodiment, when the first battery 10 is normally installed, the first battery 10 will disconnect the second power supply path 52, and the power supply path selection circuit 50 will connect the first power supply path 51, so that the first battery 10 supplies power to the door lock system 60. When the first battery 10 has a low power and needs to be removed for charging, the second power supply path 52 is conducted, and the boost circuit 40 is connected to the door lock system 60, realizing that the second battery 20 supplies power to the door lock system 60.

[0058] Optionally, the second power supply path 52 includes: a control circuit 521, which is connected to the first battery 10; a switch circuit 522, which is respectively connected to the control circuit 521, the boost circuit 40, and the door lock system 60.

[0059] In this embodiment, the control circuit 521 controls the conduction and disconnection of the switch circuit 522 according to the power of the first battery 10, so as to realize selecting the first battery 10 or the second battery 20 to supply power to the door lock system 60 according to the usage of the first battery 10.

[0060] Optionally, in a specific embodiment, in combination with Figure 4 As shown, the power supply path selection circuit 50 includes: a tenth resistor R10, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a twelfth capacitor C12, a thirteenth capacitor C13, a third diode D3, a fourth diode D4, a second PMOS transistor Q3, and a second triode Q4. Among them, the first end of the twelfth capacitor C12, the first end of the tenth resistor R10, and the source electrode of the second PMOS transistor Q3 are connected, serving as the input end of the second power supply path 52, and are connected to the output end BST of the boost circuit. The second end of the twelfth capacitor C12, the second end of the tenth resistor R10, and the first end of the fourteenth resistor R14 are all connected to the gate electrode of the second PMOS transistor Q3. The second end of the fourteenth resistor R14 is connected to the emitter of the second triode Q4. The collector of the second triode Q4 is grounded. The base of the second triode Q4 is respectively connected to the first end of the fifteenth resistor R15 and the first end of the sixteenth resistor R16. The second end of the fifteenth resistor R15 is connected to the first battery 10. The second end of the sixteenth resistor R16 is grounded. The drain of the second PMOS transistor Q3 is connected to the positive electrode of the fourth diode D4. The positive electrode of the third diode D3 is connected to the first battery 10. The negative electrode of the third diode D3, the negative electrode of the fourth diode D4, and the first end of the thirteenth capacitor C13 are connected, serving as the output end of the power supply path selection circuit, and are connected to the door lock system 60. The second end of the thirteenth capacitor C13 is grounded.

[0061] In this embodiment, when the first battery 10 is normally installed, the base of the second triode Q4 is at a high level, the second triode Q4 is turned off, so that the gate of the second PMOS transistor Q3 is at a high level, and the second PMOS transistor Q3 is turned off, that is, the switch circuit 522 is disconnected. At this time, the power supply path selection circuit 50 supplies power to the door lock system 60 through the first power supply path 51 with the first battery 10. When the first battery 10 has a low power and is removed for charging, the base of the second triode Q4 is at a low level, the second triode Q4 is turned on, so that the gate of the second PMOS transistor Q3 is at a low level, and the second PMOS transistor Q3 is turned on, that is, the switch circuit 522 is turned on. At this time, the power supply path selection circuit 50 supplies power to the door lock system 60 through the second power supply path 52 and the boost circuit 40 with the second battery 20.

[0062] Optionally, the power supply circuit further includes an alarm device. The alarm device is connected to the first battery 10.

[0063] In this embodiment, the alarm device can detect the voltage of the first battery 10 and issue an alarm in time when the first battery 10 has a low power, reminding the user to remove the first battery 10 for charging to ensure the stability of the door lock power supply system. The alarm device includes an indicator light, or issues a reminder through an electronic program product on the user terminal device.

[0064] The embodiments of the present disclosure also provide a door lock, which includes the above-mentioned power supply circuit for the door lock. The door lock is powered by a dual battery through the first battery 10 and the second battery 20. When the first battery 10 is normally installed and has a relatively high power, the first battery 10 is used to supply power to the door lock and charge the second battery 20. When the first battery 10 is removed for charging due to low power, the second battery 20 is used to supply power to the door lock. This ensures the normal use of the door lock under different circumstances and improves the stability of the door lock power supply system.

[0065] The above description and the drawings fully illustrate the embodiments of the present disclosure, enabling those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments only represent possible variations. Unless explicitly required, the individual components and functions are optional, and the order of operations may vary. Some parts and features of some embodiments may be included in or replace those of other embodiments. The embodiments of the present disclosure are not limited to the structures already described and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims.

Claims

1. A power supply circuit for a door lock, characterized in that: include: A charging management control circuit is connected to the first battery and the second battery respectively; A boost circuit connected to the second battery; A power supply path selection circuit is connected to the door lock system, the first battery and the boost circuit respectively; The rated voltage of the second battery is lower than the rated voltage of the first battery.

2. The power supply circuit according to claim 1, characterized in that: The charging management control circuit includes: a charging circuit connected to the second battery; A charging management chip is connected to the first battery and the charging circuit respectively; The MCU control circuit is connected to the first battery and the charging management chip respectively.

3. The power supply circuit according to claim 2, characterized in that: The charging management control circuit also includes: The USB power supply circuit is connected to the charging management chip.

4. The power supply circuit according to claim 2, characterized in that: The charging management chip includes the FS5175AE charging management chip.

5. The power supply circuit according to claim 1, characterized in that: The boost circuit includes: A boost chip connected to the second battery; The voltage divider circuit is connected to the voltage boost chip and the power supply path selection circuit respectively.

6. The power supply circuit according to claim 5, characterized in that: The boost chip includes the RY3710 boost chip.

7. The power supply circuit according to claim 1, characterized in that: The power supply path selection circuit includes: A first power supply path is connected to the first battery and the door lock system respectively; The second power supply path is connected to the first battery, the boost circuit and the door lock system respectively.

8. The power supply circuit according to claim 7, characterized in that: The second power supply path includes: A control circuit connected to the first battery; The switch circuit is connected to the control circuit, the boost circuit and the door lock system respectively.

9. The power supply circuit according to any one of claims 1 to 8, characterized in that: Also includes: An alarm device is connected to the first battery.

10. A door lock, characterized in that: include: A power supply circuit for a door lock as claimed in any one of claims 1 to 9.

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