Intelligent door lock battery power meter circuit based on single cell power meter chip

Abstract

This utility model relates to a battery power meter circuit for a smart door lock based on a single-cell power meter chip, including a power meter circuit, a Zener diode, and a low-voltage reminder circuit. The power meter circuit includes a single-cell power meter chip U6 and a first resistor and a second resistor connected in series. The sampling pin of the single-cell power meter chip U6 is connected to the series node of the first and second resistors. The non-series node of the first resistor and the low-voltage reminder circuit are both connected to the positive terminal of the dual-cell battery. The non-series node of the second resistor is grounded. The sampling pin of the single-cell power meter chip U6 is connected to the negative terminal of the Zener diode, and the positive terminal of the Zener diode is grounded. This design reduces product costs while meeting the requirement of accurate power calculation, preventing damage to the single-cell power meter chip U6 from overvoltage or high-voltage pulses, extending the service life of the single-cell power meter chip U6, and prompting the user to charge the dual-cell battery of the smart door lock when the battery is low on voltage.

Description

Technical Field

[0001] This utility model relates to the field of smart door lock battery technology, and in particular to a smart door lock battery power meter circuit based on a single-cell power meter chip. Background Technology

[0002] A door lock is a device that serves as an insurance and security device.

[0003] With the development of automation and intelligent technologies, and under the wave of smart homes, the intelligentization of door locks is also a development trend, leading to the emergence of smart door locks.

[0004] Because features such as facial recognition, peephole, and Wi-Fi connectivity are integrated into smart locks, the power consumption of smart locks is higher than that of traditional fingerprint locks, making them unsuitable for use with dry cell batteries.

[0005] Currently, most smart door locks are powered by rechargeable lithium batteries.

[0006] Existing smart locks use dual-cell batteries that rely on expensive dual-cell battery power meter chips for measurement. Furthermore, smart locks do not alert users when the battery voltage is low.

[0007] Therefore, in this utility model patent application, the applicant has carefully researched a smart door lock battery power meter circuit based on a single-cell power meter chip to solve the above problems. Utility Model Content

[0008] This invention addresses the shortcomings of the existing technology by providing a smart door lock battery power meter circuit based on a single-cell power meter chip. This circuit reduces product costs while meeting the requirement for accurate power calculation, prevents damage to the single-cell power meter chip U6 from overvoltage or high-voltage pulses, extends the service life of the single-cell power meter chip U6, and prompts the user to charge the dual-cell battery of the smart door lock when the battery is low on voltage.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A smart door lock battery power meter circuit based on a single-cell power meter chip, used for dual-cell batteries, includes a power meter circuit for connecting to a host and a battery low voltage reminder circuit for reminding the user when the battery voltage is low.

[0011] The battery low voltage warning circuit is used to connect to the positive terminal of a dual-cell battery;

[0012] The power meter circuit includes a single-cell power meter chip U6 and a first resistor and a second resistor connected in series.

[0013] The sampling pin of the single-cell power meter chip U6 is connected to the series node of the first resistor and the second resistor. The non-series node of the first resistor is used to connect to the positive terminal of the dual-cell battery, and the non-series node of the second resistor is grounded.

[0014] It also includes a Zener diode. The sampling pin of the single-cell power meter chip U6 is connected to the negative terminal of the Zener diode, and the positive terminal of the Zener diode is grounded.

[0015] As a preferred embodiment, the low battery warning circuit includes a chip U7, a MOSFET Q7, a resistor R31, and an indicator LED3;

[0016] The VIN pin of chip U7 is used to connect to the positive terminal of the dual-cell battery. The VSS pin of chip U7 is grounded. The OUT pin of chip U7 is connected to the gate of MOSFET Q7. The source of MOSFET Q7 is used to connect to the positive terminal of the dual-cell battery. The drain of MOSFET Q7 is connected to the positive terminal of indicator LED3 through resistor R31. The negative terminal of indicator LED3 is grounded.

[0017] As a preferred embodiment, the fuel gauge circuit also includes a power supply circuit for powering the fuel.

[0018] As a preferred embodiment, the power supply circuit includes a chip U5 for outputting 3.3V;

[0019] Pins 1 and 3 of chip U5 are used to connect to the positive terminal of the dual-cell battery. Pin 2 of chip U5 is grounded. Pin 5 of chip U5 is connected to pin 5 of chip U6 through resistor R30. Pin 5 of chip U5 is also connected to pin 3 of chip U6 through resistor R21.

[0020] As a preferred option, pin 1 of chip U5 is also grounded via capacitor C18.

[0021] As a preferred option, pin 5 of chip U5 is also grounded via capacitor C16.

[0022] As a preferred option, pin 3 of chip U6 is also grounded via capacitor C10.

[0023] As a preferred embodiment, pin 7 of the single-cell power meter chip U6 is grounded through resistor R20 and the first TVS diode.

[0024] As a preferred embodiment, pin 7 of the single-cell power meter chip U6 is grounded through resistor R20 and the first TVS diode.

[0025] Compared with the prior art, this utility model has obvious advantages and beneficial effects. Specifically, it mainly uses a single-cell power meter chip U6 to calculate the power of a dual-cell battery, which reduces product costs while meeting the requirement of accurate power calculation. In addition, a Zener diode is added to its sampling end to prevent overvoltage or high-voltage pulses from damaging the single-cell power meter chip U6 and extend the service life of the single-cell power meter chip U6. At the same time, a battery low voltage reminder circuit is set to remind the user to charge the dual-cell battery of the smart door lock in time when the battery is low.

[0026] Furthermore, by cooperating with the first TVS diode and the second TVS diode, the anti-static performance of the single-cell fuel gauge chip U6 is improved, further extending the service life of the single-cell fuel gauge chip U6.

[0027] To more clearly illustrate the structural features and effects of the present invention, a detailed description is provided below in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0028] Figure 1 This is a general control principle block diagram of an embodiment of the present invention.

[0029] Explanation of icon numbers:

[0030] 11. Fume meter circuit

[0031] 12. Low battery warning circuit. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0033] like Figure 1 As shown, a smart door lock battery power meter circuit 11 based on a single-cell power meter chip includes a power meter circuit 11 for connecting to a host and a battery low voltage reminder circuit 12 for reminding the user when the battery voltage is low.

[0034] The battery low voltage warning circuit 12 is used to connect to the positive terminal of a dual-cell battery (e.g., ...). Figure 1 (B+). In this embodiment, the low battery warning circuit 12 includes a chip U7, a MOSFET Q7, a resistor R31, and an indicator LED3;

[0035] The VIN pin of chip U7 is used to connect to the positive terminal of the dual-cell battery. The VSS pin of chip U7 is grounded. The OUT pin of chip U7 is connected to the gate of MOSFET Q7. The source of MOSFET Q7 is used to connect to the positive terminal of the dual-cell battery. The drain of MOSFET Q7 is connected to the positive terminal of indicator LED3 through resistor R31. The negative terminal of indicator LED3 is grounded.

[0036] The power meter circuit 11 includes a single-cell power meter chip U6, a power supply circuit for power supply, and a first resistor and a second resistor connected in series.

[0037] The sampling pin of the single-cell fuel gauge chip U6 is connected to the series connection of a first resistor and a second resistor. The non-series connection of the first resistor is used to connect to the positive terminal of the dual-cell battery, and the non-series connection of the second resistor is grounded. Pin 7 of the single-cell fuel gauge chip U6 is grounded through resistor R20 and a first TVS diode.

[0038] When electrostatic discharge occurs, the high voltage of the static electricity causes the first and second TVS diodes to conduct rapidly. By utilizing the high-speed switching performance of the first and second TVS diodes, the static electricity is short-circuited to ground and released, thereby effectively protecting chip U6 and improving the reliability of chip U6's operation.

[0039] It also includes a Zener diode. The sampling pin of the single-cell power meter chip U6 is connected to the negative terminal of the Zener diode, and the positive terminal of the Zener diode is grounded.

[0040] The power supply circuit includes a chip U5 for outputting 3.3V;

[0041] Pins 1 and 3 of chip U5 are both used to connect to the positive terminal of the dual-cell battery. Pin 2 of chip U5 is grounded. Pin 5 of chip U5 is connected to pin 5 of chip U6 through resistor R30. Pin 5 of chip U5 is also connected to pin 3 of chip U6 through resistor R21. Pin 1 of chip U5 is also grounded through capacitor C18. Pin 5 of chip U5 is also grounded through capacitor C16. Pin 3 of chip U6 is also grounded through capacitor C10.

[0042] The key design feature of this utility model is that it mainly uses a single-cell power meter chip U6 to calculate the power of a dual-cell battery, which reduces product costs while meeting the requirement of accurate power calculation. In addition, a Zener diode is added to its sampling end to prevent overvoltage or high-voltage pulses from damaging the single-cell power meter chip U6 and extend the service life of the single-cell power meter chip U6. At the same time, a battery low voltage reminder circuit is set to remind the user to charge the dual-cell battery of the smart door lock in time when the battery is low.

[0043] Furthermore, by cooperating with the first TVS diode and the second TVS diode, the anti-static performance of the single-cell fuel gauge chip U6 is improved, further extending the service life of the single-cell fuel gauge chip U6.

[0044] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A smart door lock battery fuel gauge circuit based on a single-cell fuel gauge chip, used for dual-cell batteries, characterized in that: It includes a fuel gauge circuit for connecting to the host and a low battery warning circuit for alerting the user when the battery voltage is low; The battery low voltage warning circuit is used to connect to the positive terminal of a dual-cell battery; The power meter circuit includes a single-cell power meter chip U6 and a first resistor and a second resistor connected in series. The sampling pin of the single-cell power meter chip U6 is connected to the series node of the first resistor and the second resistor. The non-series node of the first resistor is used to connect to the positive terminal of the dual-cell battery, and the non-series node of the second resistor is grounded. It also includes a Zener diode. The sampling pin of the single-cell power meter chip U6 is connected to the negative terminal of the Zener diode, and the positive terminal of the Zener diode is grounded.

2. The smart door lock battery power meter circuit based on a single-cell power meter chip according to claim 1, characterized in that: The low battery warning circuit includes chip U7, MOSFET Q7, resistor R31 and indicator LED3; The VIN pin of chip U7 is used to connect to the positive terminal of the dual-cell battery. The VSS pin of chip U7 is grounded. The OUT pin of chip U7 is connected to the gate of MOSFET Q7. The source of MOSFET Q7 is used to connect to the positive terminal of the dual-cell battery. The drain of MOSFET Q7 is connected to the positive terminal of indicator LED3 through resistor R31. The negative terminal of indicator LED3 is grounded.

3. The smart door lock battery power meter circuit based on a single-cell power meter chip according to claim 2, characterized in that: The fuel gauge circuit also includes a power supply circuit for powering the fuel.

4. The smart door lock battery power meter circuit based on a single-cell power meter chip according to claim 3, characterized in that: The power supply circuit includes a chip U5 for outputting 3.3V; Pins 1 and 3 of chip U5 are used to connect to the positive terminal of the dual-cell battery. Pin 2 of chip U5 is grounded. Pin 5 of chip U5 is connected to pin 5 of chip U6 through resistor R30. Pin 5 of chip U5 is also connected to pin 3 of chip U6 through resistor R21.

5. The smart door lock battery power meter circuit based on a single-cell power meter chip according to claim 4, characterized in that: Pin 1 of chip U5 is also grounded through capacitor C18.

6. The smart door lock battery power meter circuit based on a single-cell power meter chip according to claim 4, characterized in that: Pin 5 of chip U5 is also grounded through capacitor C16.

7. The smart door lock battery power meter circuit based on a single-cell power meter chip according to claim 4, characterized in that: Pin 3 of chip U6 is also grounded through capacitor C10.

8. The smart door lock battery power meter circuit based on a single-cell power meter chip according to claim 1, characterized in that: Pin 7 of the single-cell power meter chip U6 is grounded through resistor R20 and the first TVS diode.

9. The smart door lock battery power meter circuit based on a single-cell power meter chip according to claim 1, characterized in that: Pin 7 of the single-cell power meter chip U6 is grounded through resistor R20 and the first TVS diode.

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