Intelligent lock isolation standby power system

Abstract

The utility model discloses an isolation standby power system of an intelligent lock. The isolation standby power system comprises a control circuit and a power supply circuit, wherein the control circuit is used for controlling a lock to execute unlocking action; the power supply circuit is used for supplying power to the control circuit and the lock; a power supply of the power supply circuit comprises a main battery and a standby battery, and the main battery serves as the power supply of the power supply circuit when being electrified; when the electric quantity of the main battery is used up, the power supply of the power supply circuit can be switched into the standby battery under the trigger action actively applied by a user, and the power supply circuit taking the standby battery as the power supply can cut off power supply to the control circuit and the lock after the control circuit controls the lock to execute a single unlocking action or after a set time threshold value is exceeded. The isolation standby power system for the intelligent lock has the advantages that the standby battery and control logic of the standby battery are additionally arranged, so that the intelligent lock can still operate normally when the main battery fails, and reliability and user experience of the intelligent lock are improved.

Description

Technical Field

[0001] The utility model relates to the field of intelligent locks, and in particular to an isolation and backup power system for intelligent locks. Background Art

[0002] With the development of technology, smart locks are becoming more and more widely used as an important part of home and commercial security protection. These locks can realize functions such as remote control, fingerprint recognition, and face recognition, providing users with a convenient and safe experience. However, the stable power supply problem of smart locks has always been an important challenge in their design and use.

[0003] At present, most smart locks rely only on the main battery for power supply. If the main battery is exhausted due to long-term non-charging or other reasons, the lock will not work properly, resulting in users being unable to open the lock smoothly. This situation not only brings inconvenience to users, but also poses a safety hazard in an emergency.

[0004] In order to solve the above problems, some smart locks have designed backup battery solutions to deal with the situation where the main battery is exhausted. However, traditional backup battery solutions often have problems such as delayed startup, poor battery life and unnecessary energy consumption.

[0005] Therefore, there is an urgent need for a backup battery solution that can effectively ensure the normal use of smart locks when the main battery is exhausted. This solution should have two major characteristics: first, the backup battery can be started under the trigger action actively applied by the user, thereby achieving rapid response; second, after the execution is completed, the backup battery can promptly cut off the power supply to the control circuit and lock to avoid unnecessary energy consumption.

[0006] The innovation of the present utility model is based on the above background, and proposes an isolated backup power system for a smart lock. By adding a backup battery and its control logic, it ensures that the smart lock can still operate normally when the main battery fails, thereby improving the reliability and user experience of the smart lock. Utility Model Content

[0007] The purpose of the utility model is to provide an intelligent lock isolation backup power system to solve the problems raised in the background technology.

[0008] The above technical objectives of the utility model are achieved through the following technical solutions:

[0009] An intelligent lock isolation power backup system, comprising:

[0010] A control circuit for controlling the lock to perform an unlocking action;

[0011] And a power supply circuit for supplying power to the control circuit and the lock; wherein,

[0012] The power supply of the power supply circuit includes a main battery and a backup battery. The main battery serves as the power supply of the power supply circuit when it has power. When the main battery is exhausted, the power supply of the power supply circuit will be switched to the backup battery under a trigger action actively applied by the user. The power supply circuit using the backup battery as the power supply will cut off the power supply to the control circuit and the lock after the control circuit controls the lock to perform a single unlocking action or after exceeding a set time threshold.

[0013] It is further configured that the control circuit includes a control chip U1; the power supply circuit includes a diode D8, a MOS tube Q4, a diode D9, a main battery interface and a backup battery interface;

[0014] The main battery is connected to the main battery interface, the output end of the main battery interface is connected to the positive electrode of the diode D8, and the negative electrode of the diode D8 is used as the main power supply end; the backup battery is connected to the backup battery interface, the output end of the backup battery interface is connected to the source of the MOS tube Q4, the drain of the MOS tube Q4 is connected to the positive electrode of the diode D9, and the negative electrode of the diode D9 is connected to the main power supply end;

[0015] It also includes a button connected to the gate of the MOS tube Q4. When the button is pressed, the MOS tube Q4 is turned on. At the same time, the second enable terminal of the control chip U1 outputs a high level, so that the MOS tube Q4 remains in a turned-on state, and the output end of the backup battery interface is connected to the main power supply end.

[0016] It is further configured that the power supply circuit further includes a resistor R3, a resistor R11, a resistor R14, a resistor R16, a resistor R21, a capacitor C2 and a transistor Q6;

[0017] One end of the resistor R3 is connected to the source of the MOS tube Q4, the other end of the resistor R3 is connected to the gate of the MOS tube Q4 and one end of the resistor R14, the other end of the resistor R14 is connected to one end of the resistor R11 and the collector of the transistor Q6, one end of the key is grounded, and the other end of the key is connected to the other end of the resistor R11; the emitter of the transistor Q6 is grounded, the base of the transistor Q6 is connected to the resistor R16 and one end of the resistor R21, the other end of the resistor R21 is grounded, and the other end of the resistor R16 is connected to the second enable end of the control chip U1; one end of the capacitor C2 is connected to the drain of the MOS tube Q4, and the other end of the capacitor C2 is grounded.

[0018] A further configuration is that the power supply circuit also includes a key detection circuit for detecting the key status, and the key detection circuit includes a resistor R54, a resistor R55, a resistor R56 and a transistor Q7; the ungrounded end of the key is connected to one end of the resistor R56, the other end of the resistor R56 is connected to the base of the transistor Q7, the collector of the transistor Q7 is grounded, the emitter of the transistor Q7 is connected to one end of the resistor R54 and one end of the resistor R55, the other end of the resistor R54 is connected to the power supply pin of the control chip U1, and the other end of the resistor R55 is connected to the first enable end of the control chip U1.

[0019] A further configuration is that the power supply circuit also includes a backup battery power detection circuit for detecting the power of the backup battery, and the backup battery power detection circuit includes a resistor R36, a resistor R41 and a capacitor C42; one end of the resistor R36 is connected to the positive electrode of the diode D9, the other end of the resistor R36 is connected to one end of the resistor R41, one end of the capacitor C42 and the third enable end of the control chip U1, and the other end of the resistor R41 and the other end of the capacitor C42 are both grounded.

[0020] It is further configured that the power supply circuit also includes a charging circuit for charging the backup battery from the main battery, and the charging circuit includes a charging management chip U6, a resistor R31, a resistor R74, a capacitor C6 and a capacitor C9, and the model of the charging management chip U6 is CE6321B50ES; the 8th and 7th pins of the charging management chip U6 are connected and connected to the main power supply end at the same time, the 4th pin of the charging management chip U6 is connected to one end of the resistor R31 and one end of the resistor R74, the other end of the resistor R74 and the 5th pin of the charging management chip U6 are both grounded, and the other end of the resistor R31 is connected to the fourth enable end of the control chip U1; the 1st and 2nd pins of the charging management chip U6 are connected, and this end serves as a 5V power supply end and is connected to the positive electrode of the capacitor C9 and one end of the capacitor C6, and the negative electrode of the capacitor C9 and the other end of the capacitor C6 are both grounded;

[0021] The charging circuit also includes a charging protection chip U4, a resistor R29, an inductor L3, a diode D6, a MOS tube Q3, a capacitor C15 and a capacitor C3. The model of the charging protection chip U4 is CN3302; pin 2 of the charging protection chip U4 is connected to the 5V power supply end, pin 4 is grounded, and pin 7 is connected to the 5V power supply end and one end of the resistor R29. The other end of the resistor R29 is connected to pin 8 of the charging protection chip U4 and one end of the inductor L3. The other end of the inductor L3 is connected to the positive electrode of the diode D6 and the drain of the MOS tube Q3. The source of the MOS tube Q3 is grounded, and the gate is connected to pin 5 of the charging protection chip U4. The negative electrode of the diode D6 is connected to the positive electrode of the capacitor C15 and one end of the capacitor C3. The negative electrode of the capacitor C15 and the other end of the capacitor C3 are both grounded; the negative electrode of the diode D6 is connected to pin 3 of the charging protection chip U4, and this end is also connected to the output end of the backup battery interface.

[0022] A further configuration is that the power supply circuit also includes an interlock circuit that prevents the backup battery from discharging simultaneously when the main battery is charging the backup battery; the interlock circuit includes resistor R9, resistor R18, resistor R27 and transistor Q5, one end of the resistor R9 is connected to the second enable end of the control chip U1, the other end of the resistor R9 is connected to one end of the resistor R18 and the base of the transistor Q5, the other end of the resistor R18 and the emitter of the transistor Q5 are both grounded, the collector of the transistor Q5 is connected to one end of the resistor R27, and the other end of the resistor R27 is connected to pin 4 of the charging management chip U6.

[0023] The above technical objectives of the utility model are achieved through the following technical solutions:

[0024] The utility model has the following beneficial effects:

[0025] When the main battery has power, it serves as the power supply of the power supply circuit to power the control circuit and the lock. When the main battery is exhausted due to long-term non-charging or other reasons, the user can actively press a button to switch the power supply of the power supply circuit to the backup battery, which will power the control circuit and the lock, with the advantage of fast response. At the same time, the power supply circuit whose power supply is the backup battery will cut off the power supply to the control circuit and the lock after the control circuit controls the lock to perform a single unlocking action or after exceeding the set time threshold, so as to avoid the loss of power in the backup battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A circuit diagram of a power supply circuit and a backup battery power detection circuit included in the embodiment;

[0027] Figure 2 This is a circuit diagram of the control chip U1 in the embodiment;

[0028] Figure 3 A circuit diagram of a key and a key detection circuit in an embodiment;

[0029] Figure 4 is a circuit diagram of a charging circuit in an embodiment;

[0030] Figure 5 A circuit diagram of an interlocking circuit in an embodiment;

[0031] Figure 6 A circuit diagram of a step-down circuit in an embodiment;

[0032] Figure 7 It is a principle block diagram of an embodiment. DETAILED DESCRIPTION

[0033] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0034] As attached Figures 1 to 7 As shown;

[0035] This embodiment discloses a smart lock isolation power backup system, including:

[0036] A control circuit for controlling the lock to perform an unlocking action;

[0037] and a power supply circuit for supplying power to the control circuit and the lock; wherein,

[0038] The power supply of the power supply circuit includes a main battery and a backup battery. The main battery serves as the power supply for the power supply circuit when it has power. When the main battery is exhausted, the power supply of the power supply circuit will switch to the backup battery under the trigger action actively applied by the user. The power supply circuit using the backup battery as the power supply will cut off the power supply to the control circuit and the lock after the control circuit controls the lock to perform a single unlocking action or after exceeding the set time threshold.

[0039] Among them, the control circuit includes a control chip U1, the model of the control chip U1 is N32WB03x, and the power supply circuit includes a diode D8, a MOS tube Q4, a diode D9, a main battery interface P5 and a backup battery interface P7;

[0040] The main battery is connected to the main battery interface P5, the output end of the main battery interface P5 is connected to the positive electrode of the diode D8, and the negative electrode of the diode D8 is used as the main power supply end VIN_BAT; the backup battery is connected to the backup battery interface P7, the output end SUB_BAT of the backup battery interface P7 is connected to the source of the MOS tube Q4, the drain of the MOS tube Q4 is connected to the positive electrode of the diode D9, and the negative electrode of the diode D9 is connected to the main power supply end VIN_BAT;

[0041] It also includes a button S2 connected to the gate of the MOS tube Q4. The trigger action actively applied by the user is pressing the button S2. After the button S2 is pressed, the MOS tube Q4 is turned on. At the same time, the second enable terminal BAT_ADC_EN of the control chip U1 will output a high level, so that the MOS tube Q4 remains in the on state, and the output terminal SUB_BAT of the backup battery interface P7 is connected to the main power supply terminal VIN_BAT.

[0042] The power supply circuit further includes a resistor R3, a resistor R11, a resistor R14, a resistor R16, a resistor R21, a capacitor C2 and a transistor Q6;

[0043] One end of the resistor R3 is connected to the source of the MOS tube Q4, the other end of the resistor R3 is connected to the gate of the MOS tube Q4 and one end of the resistor R14, the other end of the resistor R14 is connected to one end of the resistor R11 and the collector of the transistor Q6, one end of the button S2 is grounded, and the other end of the button S2 is connected to the other end of the resistor R11; the emitter of the transistor Q6 is grounded, the base of the transistor Q6 is connected to the resistor R16 and one end of the resistor R21, the other end of the resistor R21 is grounded, and the other end of the resistor R16 is connected to the second enable terminal BAT_ADC_EN of the control chip U1; one end of the capacitor C2 is connected to the drain of the MOS tube Q4, and the other end of the capacitor C2 is grounded.

[0044] Among them, the power supply circuit also includes a key detection circuit for detecting the key status, and the key detection circuit includes resistor R54, resistor R55, resistor R56 and transistor Q7; the ungrounded end of the key S2 is connected to one end of the resistor R56, the other end of the resistor R56 is connected to the base of the transistor Q7, the collector of the transistor Q7 is grounded, the emitter of the transistor Q7 is connected to one end of the resistor R54 and one end of the resistor R55, the other end of the resistor R54 is connected to the power supply pin of the control chip U1, and the other end of the resistor R55 is connected to the first enable terminal Key_det of the control chip U1.

[0045] Among them, the power supply circuit also includes a backup battery power detection circuit for detecting the power of the backup battery, and the backup battery power detection circuit includes a resistor R36, a resistor R41 and a capacitor C42; one end of the resistor R36 is connected to the positive electrode of the diode D9, and the other end of the resistor R36 is connected to one end of the resistor R41, one end of the capacitor C42 and the third enable terminal BAT_SUB_ADC of the control chip U1, the third enable terminal BAT_SUB_ADC of the control chip U1 has its own analog-to-digital conversion function, and the other end of the resistor R41 and the other end of the capacitor C42 are both grounded.

[0046] Among them, the power supply circuit also includes a charging circuit for the main battery to charge the backup battery, and the charging circuit includes a charging management chip U6, a resistor R31, a resistor R74, a capacitor C6 and a capacitor C9, and the model of the charging management chip U6 is CE6321B50ES; the 8th and 7th pins of the charging management chip U6 are connected and connected to the main power supply terminal VIN_BAT at the same time, the 4th pin of the charging management chip U6 is connected to one end of the resistor R31 and one end of the resistor R74, the other end of the resistor R74 and the 5th pin of the charging management chip U6 are grounded, and the other end of the resistor R31 is connected to the fourth enable terminal BAT1_EN of the control chip U1; the 1st and 2nd pins of the charging management chip U6 are connected, and this end is used as a 5V power supply end and is connected to the positive electrode of the capacitor C9 and one end of the capacitor C6, and the negative electrode of the capacitor C9 and the other end of the capacitor C6 are grounded;

[0047] The charging circuit also includes a charging protection chip U4, a resistor R29, an inductor L3, a diode D6, a MOS tube Q3, a capacitor C15 and a capacitor C3. The model of the charging protection chip U4 is CN3302; pin 2 of the charging protection chip U4 is connected to the 5V power supply end, pin 4 is grounded, and pin 7 is connected to the 5V power supply end and one end of the resistor R29. The other end of the resistor R29 is connected to pin 8 of the charging protection chip U4 and one end of the inductor L3. The other end of the inductor L3 is connected to the positive electrode of the diode D6 and the drain of the MOS tube Q3. The source of the MOS tube Q3 is grounded, and the gate is connected to pin 5 of the charging protection chip U4. The cathode of the diode D6 is connected to the positive electrode of the capacitor C15 and one end of the capacitor C3. The cathode of the capacitor C15 and the other end of the capacitor C3 are both grounded; the cathode of the diode D6 is connected to pin 3 of the charging protection chip U4, and this end is also connected to the output end SUB_BAT of the backup battery interface P7.

[0048] Among them, the power supply circuit also includes an interlock circuit that prevents the backup battery from discharging at the same time when the main battery is charging the backup battery; the interlock circuit includes resistor R9, resistor R18, resistor R27 and transistor Q5, one end of the resistor R9 is connected to the second enable terminal BAT_ADC_EN of the control chip U1, the other end of the resistor R9 is connected to one end of the resistor R18 and the base of the transistor Q5, the other end of the resistor R18 and the emitter of the transistor Q5 are both grounded, the collector of the transistor Q5 is connected to one end of the resistor R27, and the other end of the resistor R27 is connected to pin 4 of the charging management chip U6.

[0049] This embodiment also includes a step-down circuit, and the control chip U1 unlocks the lock by controlling the rotation of the motor; the step-down circuit and the motor are conventional settings and will not be elaborated here.

[0050] The working principle of this embodiment is:

[0051] When the main battery has power, it serves as the power supply for the power supply circuit to power the control circuit and the lock. The output terminal VBAT1 of the main battery outputs the main power supply terminal VIN_BAT through the diode D8. The main power supply terminal VIN_BAT generates the VCC_MCU voltage through the step-down circuit. The VCC_MCU voltage is connected to the power supply pin of the control chip U1 to power it.

[0052] When the main battery is exhausted due to long-term non-charging or other reasons, the user can actively press the button S2 to switch the power supply of the power supply circuit to the backup battery, and the backup battery will power the control circuit and the lock.

[0053] Specifically: when the button S2 is pressed, the first enable terminal Key_det of the control chip U1 will undergo a level conversion. After the first enable terminal Key_det of the control chip U1 detects the level conversion, the second enable terminal BAT_ADC_EN of the control chip U1 will output a high level, so that Q6 is turned on, and then the MOS tube Q4 remains in the on state; the purpose of doing this is to avoid the user having to press the button S2 all the time, making the operation more convenient.

[0054] When the control chip U1 controls the lock through the motor to perform a single unlocking action or exceeds the set time threshold (30 seconds), the second enable terminal BAT_ADC_EN of the control chip U1 outputs a low level, so that the MOS tube Q4 is turned off, thereby cutting off the power supply of the backup battery.

[0055] In addition, when the fourth enable terminal BAT1_EN of the control chip U1 outputs a high level, the charging management chip U6 works, and the main battery charges the backup battery. When the backup battery is discharging, it is necessary to stop the main battery from charging the backup battery; when the backup battery is discharging, the second enable terminal BAT_ADC_EN of the control chip U1 will output a high level, at this time, the transistor Q5 will be turned on, the voltage at the BAT1_EN1 terminal will be pulled down to a low level, and the charging management chip U6 will not work.

[0056] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A smart lock isolation power backup system, characterized in that: Included are: A control circuit for controlling the lock to perform an unlocking action; And a power supply circuit for supplying power to the control circuit and the lock; wherein, The power supply of the power supply circuit includes a main battery and a backup battery. The main battery serves as the power supply of the power supply circuit when it has power. When the main battery is exhausted, the power supply of the power supply circuit will be switched to the backup battery under a trigger action actively applied by the user. The power supply circuit using the backup battery as the power supply will cut off the power supply to the control circuit and the lock after the control circuit controls the lock to perform a single unlocking action or after exceeding a set time threshold.

2. According to claim 1, the intelligent lock isolation power backup system is characterized by: The control circuit includes a control chip U1; the power supply circuit includes a diode D8, a MOS tube Q4, a diode D9, a main battery interface and a backup battery interface; The main battery is connected to the main battery interface, the output end of the main battery interface is connected to the positive electrode of the diode D8, and the negative electrode of the diode D8 is used as the main power supply end; the backup battery is connected to the backup battery interface, the output end of the backup battery interface is connected to the source of the MOS tube Q4, the drain of the MOS tube Q4 is connected to the positive electrode of the diode D9, and the negative electrode of the diode D9 is connected to the main power supply end; It also includes a button connected to the gate of the MOS tube Q4. When the button is pressed, the MOS tube Q4 is turned on. At the same time, the second enable terminal of the control chip U1 outputs a high level, so that the MOS tube Q4 remains in a turned-on state, and the output end of the backup battery interface is connected to the main power supply end.

3. According to claim 2, the intelligent lock isolation power backup system is characterized by: The power supply circuit also includes a resistor R3, a resistor R11, a resistor R14, a resistor R16, a resistor R21, a capacitor C2 and a transistor Q6; One end of the resistor R3 is connected to the source of the MOS tube Q4, the other end of the resistor R3 is connected to the gate of the MOS tube Q4 and one end of the resistor R14, the other end of the resistor R14 is connected to one end of the resistor R11 and the collector of the transistor Q6, one end of the key is grounded, and the other end of the key is connected to the other end of the resistor R11; the emitter of the transistor Q6 is grounded, the base of the transistor Q6 is connected to the resistor R16 and one end of the resistor R21, the other end of the resistor R21 is grounded, and the other end of the resistor R16 is connected to the second enable end of the control chip U1; one end of the capacitor C2 is connected to the drain of the MOS tube Q4, and the other end of the capacitor C2 is grounded.

4. According to claim 2, the intelligent lock isolation power backup system is characterized by: The power supply circuit also includes a key detection circuit for detecting the key status, and the key detection circuit includes a resistor R54, a resistor R55, a resistor R56 and a transistor Q7; the ungrounded end of the key is connected to one end of the resistor R56, the other end of the resistor R56 is connected to the base of the transistor Q7, the collector of the transistor Q7 is grounded, the emitter of the transistor Q7 is connected to one end of the resistor R54 and one end of the resistor R55, the other end of the resistor R54 is connected to the power supply pin of the control chip U1, and the other end of the resistor R55 is connected to the first enable end of the control chip U1.

5. According to claim 2, the intelligent lock isolation power backup system is characterized by: The power supply circuit also includes a backup battery power detection circuit for detecting the power of the backup battery, and the backup battery power detection circuit includes a resistor R36, a resistor R41 and a capacitor C42; one end of the resistor R36 is connected to the positive electrode of the diode D9, the other end of the resistor R36 is connected to one end of the resistor R41, one end of the capacitor C42 and the third enable end of the control chip U1, and the other end of the resistor R41 and the other end of the capacitor C42 are both grounded.

6. The intelligent lock isolation power backup system according to claim 2, characterized in that: The power supply circuit also includes a charging circuit for the main battery to charge the backup battery. The charging circuit includes a charging management chip U6, a resistor R31, a resistor R74, a capacitor C6 and a capacitor C9. The model of the charging management chip U6 is CE6321B50ES; the 8th and 7th pins of the charging management chip U6 are connected and connected to the main power supply end at the same time, the 4th pin of the charging management chip U6 is connected to one end of the resistor R31 and one end of the resistor R74, the other end of the resistor R74 and the 5th pin of the charging management chip U6 are both grounded, and the other end of the resistor R31 is connected to the fourth enable end of the control chip U1; the 1st and 2nd pins of the charging management chip U6 are connected, and this end serves as a 5V power supply end and is connected to the positive electrode of the capacitor C9 and one end of the capacitor C6, and the negative electrode of the capacitor C9 and the other end of the capacitor C6 are both grounded; The charging circuit also includes a charging protection chip U4, a resistor R29, an inductor L3, a diode D6, a MOS tube Q3, a capacitor C15 and a capacitor C3. The model of the charging protection chip U4 is CN3302; pin 2 of the charging protection chip U4 is connected to the 5V power supply end, pin 4 is grounded, and pin 7 is connected to the 5V power supply end and one end of the resistor R29. The other end of the resistor R29 is connected to pin 8 of the charging protection chip U4 and one end of the inductor L3. The other end of the inductor L3 is connected to the positive electrode of the diode D6 and the drain of the MOS tube Q3. The source of the MOS tube Q3 is grounded, and the gate is connected to pin 5 of the charging protection chip U4. The negative electrode of the diode D6 is connected to the positive electrode of the capacitor C15 and one end of the capacitor C3. The negative electrode of the capacitor C15 and the other end of the capacitor C3 are both grounded; the negative electrode of the diode D6 is connected to pin 3 of the charging protection chip U4, and this end is also connected to the output end of the backup battery interface.

7. The intelligent lock isolation power backup system according to claim 6, characterized in that: The power supply circuit also includes an interlock circuit that prevents the backup battery from discharging simultaneously when the main battery is charging the backup battery; the interlock circuit includes resistor R9, resistor R18, resistor R27 and transistor Q5, one end of the resistor R9 is connected to the second enable end of the control chip U1, the other end of the resistor R9 is connected to one end of the resistor R18 and the base of the transistor Q5, the other end of the resistor R18 and the emitter of the transistor Q5 are both grounded, the collector of the transistor Q5 is connected to one end of the resistor R27, and the other end of the resistor R27 is connected to pin 4 of the charging management chip U6.

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