Energy storage type emergency unlocking power supply circuit and emergency unlocking equipment thereof

Abstract

The utility model relates to an energy storage type emergency unlocking power supply circuit and emergency unlocking equipment thereof. The energy storage type emergency unlocking power supply circuit comprises an input module J2, a protection module, a control module, an energy storage module and an output module J1 which are connected in sequence, the protection module comprises a triode Q3, a resistor R7, a resistor R8, a resistor R9, a Zener diode Z1 and a field effect transistor Q2, the negative electrode of the Zener diode Z1 is connected with the input module J2 through the resistor R7, the emitting electrode of the triode Q3 is connected with the source electrode of the input module J2 and the source electrode of the field effect transistor Q2, the base electrode of the triode Q3 is connected between the negative electrode of the Zener diode Z1 and the resistor R7 through the resistor R8, and the emitter electrode of the triode Q3 is connected with the source electrode of the field effect transistor Q2. The collector electrode of the triode Q3 is connected with the grid electrode of the field effect transistor Q2 and is connected with the positive electrode of the voltage stabilizing diode Z1 through the resistor R9, and the drain electrode of the field effect transistor Q2 is connected with the control module; the energy storage module comprises a plurality of farad capacitors connected in series, and the output module J1 is used for being connected with a battery of the intelligent door lock; emergency unlocking can be achieved under the condition that the voltage of a door lock battery is reduced or the battery is damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of emergency power supply of intelligent door locks, in particular to an energy storage type emergency unlocking power supply circuit and an emergency unlocking device thereof. Background Art

[0002] At present, there are usually two types of power sources used by various types of smart door locks: one is to use AC power after transformation and rectification, and then supply it to the electronic door lock through the power transmission line. Its disadvantages are that when there is a power outage, the door cannot be opened or closed, and it consumes a lot of energy, is large in size, and the power transmission line is exposed. The other is to use batteries to power the electronic door lock. In actual applications, the smart door lock cannot be opened normally due to reasons such as battery voltage reduction or battery damage due to long service life.

[0003] Therefore, it is urgent to design a device that can be used for emergency unlocking when the door lock battery voltage is reduced or the battery is damaged and cannot be unlocked normally. Utility Model Content

[0004] In view of this, a circuit and a device are provided for emergency unlocking when the door lock battery voltage is reduced or the battery is damaged and cannot be unlocked normally.

[0005] An energy storage emergency unlocking power supply circuit comprises an input module J2, a protection module, a control module, an energy storage module and an output module J1 which are connected in sequence;

[0006] The protection module includes a transistor Q3, a resistor R7, a resistor R8, a resistor R9, a voltage-stabilizing diode Z1 and a field-effect transistor Q2. The positive electrode of the voltage-stabilizing diode Z1 is grounded, and the negative electrode of the voltage-stabilizing diode Z1 is connected to the input module J2 through the resistor R7. The emitter of the transistor Q3 is connected to the input module J2 and the source of the field-effect transistor Q2 respectively. The base of the transistor Q3 is connected between the negative electrode of the voltage-stabilizing diode Z1 and the resistor R7 through the resistor R8. The collector of the transistor Q3 is connected to the gate of the field-effect transistor Q2 and is connected to the positive electrode of the voltage-stabilizing diode Z1 through the resistor R9. The drain of the field-effect transistor Q2 is connected to the control module; the control module is used to control the charging voltage and the charging current; the energy storage module includes multiple farad capacitors connected in series; the input module J2 is used to be connected to the input charging power supply; the output module J1 is used to be connected to the battery of the smart door lock.

[0007] Furthermore, the control module includes a control chip U1, a field effect transistor Q1, an inductor L1, a diode D2, a resistor R3, a resistor R4 and a resistor R5; the gate of the field effect transistor Q1 is connected to the gate drive terminal LDRV pin of the off-chip N-channel power transistor of the control chip U1 through the resistor R3, the source of the field effect transistor Q1 is grounded, and is connected between the gate of the field effect transistor Q1 and the resistor R3 through the resistor R4, the drain of the field effect transistor Q1 is connected to the positive electrode of the diode D2, and the battery voltage feedback of the control chip U1 The input terminal BAT pin is connected to the cathode of the diode D2, the cathode of the diode D2 is connected to the energy storage module, the inductor L1 is connected in series between the inductor current detection negative input terminal CSN pin of the control chip U1 and the anode of the diode D2, the resistor R5 is connected in series between the inductor current detection negative input terminal CSN pin of the control chip U1 and the drain of the field effect tube Q2, and the power supply positive input terminal VIN pin and the chip enable input terminal CE pin of the control chip U1 are both connected between the drain of the field effect tube Q2 and the resistor R5.

[0008] Furthermore, the control module also includes a reminder module, which includes a transistor Q4, a display light D1, a resistor R1, a resistor R2, a resistor R10 and a resistor R11. The collector of the transistor Q4 is connected to the display light D1 through the resistor R10, the emitter of the transistor Q4 is connected between the drain of the field effect transistor Q2 and the resistor R5, the base of the transistor Q4 is connected between the drain of the field effect transistor Q2 and the resistor R5 through the resistor R1, and is connected to the charging status indication output terminal STAT pin of the control chip U1 through the resistor R2. The charging status indication output terminal STAT pin of the control chip U1 is connected to the display light D1 through the resistor R11.

[0009] Furthermore, the control module also includes a diode D3, a diode D4 and a resistor R6, the anode of the diode D3 is connected to the cathode of the diode D2, the cathode of the diode D3 is connected to the anode of the diode D4, the cathode of the diode D4 is connected to the energy storage module, one end of the resistor R6 is grounded, and the other end is connected to the anode of the diode D4.

[0010] Furthermore, the control module further includes a capacitor C4, one end of the capacitor C4 is connected between the cathode of the diode D2 and the anode of the diode D3, and the other end is grounded.

[0011] Furthermore, the protection module further includes a capacitor C3, one end of the capacitor C3 is connected to the drain of the field effect transistor Q2, and the other end is grounded.

[0012] Furthermore, the control module is provided with a power input terminal V1 , and the power input terminal V1 is connected to a power positive input terminal VIN pin of the control chip U1 .

[0013] The present application also provides an energy storage type emergency unlocking device, which includes: the above-mentioned energy storage type emergency unlocking power supply circuit.

[0014] The energy storage emergency unlocking power supply circuit is provided with a protection module, and the voltage regulator diode Z1, the transistor Q3 and the field effect transistor Q2 cooperate to control the power supply voltage of the subsequent circuit not to exceed the preset value, so as to provide overvoltage protection for the subsequent circuit; by setting the energy storage module as a plurality of Farad capacitors connected in series, a large amount of charge can be released in a short time, and a high power output can be provided, thereby improving the discharge current and charging efficiency; the energy storage emergency unlocking device adopts the energy storage emergency unlocking power supply circuit, which has a small overall size, is convenient and practical, and is easy to carry. It can be placed in a car or a carry-on bag without flammable risks, and can be stored for a long time in various environments, has a long storage life, has no strict requirements on the ambient temperature and humidity, and is suitable for use at a temperature of -40 to 100°C, avoiding the problem of battery capacity attenuation of lithium batteries in cold weather; it can charge the built-in battery of the smart door lock, and can also directly power the smart door lock when the door lock battery voltage is reduced or the battery is damaged and cannot be unlocked normally, so that emergency unlocking can be achieved, and the usage scenario is more extensive. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model is a circuit diagram of an energy storage emergency unlocking power supply circuit provided in an embodiment of the utility model.

[0016] Control chip CN3302 pin description:

[0017] 1. STAT Charging status indication output. CMOS output. When this pin is high, it indicates that the charger is in charging state; when this pin is low, it indicates that the charger is in charging end state. 2. CE Chip enable input. A high input level will put CN3302 in normal working state; a low input level will put CN3302 in disabled state. The CE pin can be driven by TTL level or CMOS level.

[0018] 3. BAT Battery voltage feedback input terminal. This pin is directly connected to the positive pole of the battery to detect the battery voltage. 4. GND Power ground. Input charging power and the negative pole of the battery.

[0019] 5. LDEV Off-chip N-channel power tube gate drive terminal. Connected to the gate of the external N-channel field effect transistor (MOSFET).

[0020] 6. HDRV is the gate drive terminal of the off-chip P-channel power tube. Connected to the gate of the external P-channel field effect transistor (MOSFET). When low battery voltage protection or battery terminal short circuit protection is not required, there is no need to use an external P-channel field effect transistor and this pin can be left floating.

[0021] 7. VIN Power positive input terminal. The VIN pin provides the operating power for the internal circuit of CN3302 and is also the positive input terminal for inductor current (input current) detection.

[0022] 8. CSN Inductor current detection negative input terminal. Connect a current detection resistor RCS between the VIN pin and the CSN pin to detect the inductor current (input current). DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments; based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0024] See also Figure 1 , showing an energy storage emergency unlocking power supply circuit provided by an embodiment of the utility model, comprising an input module J2, a protection module, a control module, an energy storage module and an output module J1 connected in sequence;

[0025] The protection module includes a transistor Q3, a resistor R7, a resistor R8, a resistor R9, a voltage-stabilizing diode Z1 and a field-effect transistor Q2. The positive electrode of the voltage-stabilizing diode Z1 is grounded, the negative electrode of the voltage-stabilizing diode Z1 is connected to the input module J2 through the resistor R7, the emitter of the transistor Q3 is connected to the input module J2 and the source of the field-effect transistor Q2 respectively, the base of the transistor Q3 is connected between the negative electrode of the voltage-stabilizing diode Z1 and the resistor R7 through the resistor R8, the collector of the transistor Q3 is connected to the gate of the field-effect transistor Q2, and is connected to the positive electrode of the voltage-stabilizing diode Z1 through the resistor R9, and the drain of the field-effect transistor Q2 is connected to the control module; In this embodiment, the model of transistor Q3 is 8550, the model of field effect tube Q2 is 3401, the resistance value of resistor R7 is 1KΩ, the resistance value of resistor R8 and resistor R9 are both 5.1KΩ, and the voltage stabilizing diode Z1 makes the working voltage of the connection point of resistor R7 and resistor R8 stable at 5.6V. When the input voltage is lower than 6.5V, transistor Q3 is turned off, field effect tube Q2 is turned on, and power is supplied to the subsequent circuit. When the input voltage is higher than 6.5V, transistor Q3 is turned on, field effect tube Q2 is turned off, and power is not supplied to the subsequent circuit, thereby achieving the effect of overvoltage protection, and controlling the power supply voltage of the subsequent circuit not to exceed 6.5V;

[0026] The control module is used to control the charging voltage and charging current;

[0027] The energy storage module includes multiple farad capacitors connected in series, and its energy storage characteristics are equivalent to those of a power battery. It can release a large amount of charge in a short time, provide high power output, and can perform large current charging and discharging, thereby improving the discharge current and charging efficiency. This characteristic can be used as an emergency power supply, which is suitable for scenarios that require high power output in a short time, such as door lock emergency power supply. The discharge rate of lithium batteries is relatively slow. In addition, farad capacitors can prevent lithium batteries from being over-discharged if they are stored for a long time without use, and the door lock cannot be charged when in use. It can also avoid the problem of lithium batteries having high requirements for the storage environment temperature. The farad capacitor used in this embodiment is 20F / 2.7V.

[0028] The input module J2 is used to connect to the input charging power supply, which includes a mobile power supply and / or a charging adapter. The input module J2 intelligently matches the positive and negative poles of the input charging power supply to charge the farad capacitor;

[0029] The output module J1 is used to connect to the built-in battery of the smart door lock. When in use, after the output module J1 is connected to the built-in battery of the smart door lock, the farad capacitor charges the built-in battery of the smart door lock, or directly powers the smart door lock, thereby ensuring that the door lock can be unlocked in an emergency when the battery voltage is low or the battery is damaged and cannot be unlocked normally.

[0030] Further, the control module includes a control chip U1, a field effect transistor Q1, an inductor L1, a diode D2, a resistor R3, a resistor R4 and a resistor R5; specifically, the model of the control chip U1 is CN3302, the gate of the field effect transistor Q1 is connected to the gate drive terminal LDRV pin of the off-chip N-channel power tube of the control chip U1 through the resistor R3, the source of the field effect transistor Q1 is grounded, and is connected between the gate of the field effect transistor Q1 and the resistor R3 through the resistor R4, the drain of the field effect transistor Q1 is connected to the positive electrode of the diode D2, the battery voltage feedback input terminal BAT pin of the control chip U1 is connected to the negative electrode of the diode D2, the negative electrode of the diode D2 is connected to the energy storage module, and the inductor L1 is connected in series to the power supply of the control chip U1. Between the negative input terminal CSN pin of the inductive current detection and the positive electrode of the diode D2, the resistor R5 is connected in series between the negative input terminal CSN pin of the inductive current detection of the control chip U1 and the drain of the field effect tube Q2, and the power supply positive input terminal VIN pin and the chip enable input terminal CE pin of the control chip U1 are both connected between the drain of the field effect tube Q2 and the resistor R5; in this embodiment, the inductance range of the inductor L1 is 0.1~6.8μH, the model of the field effect tube Q1 is 3400, and the resistance value of the resistor R4 is 10KΩ respectively. The control chip U1 is a PFM boost dual-cell lithium battery charging control integrated circuit, which adopts constant current and quasi-constant voltage modes for charging management, and the charging current and voltage limiting functions are realized through the control chip U1.

[0031] Furthermore, the control module also includes a reminder module, which includes a transistor Q4, a display light D1, a resistor R1, a resistor R2, a resistor R10 and a resistor R11. Specifically, the collector of the transistor Q4 is connected to the display light D1 through the resistor R10, the emitter of the transistor Q4 is connected between the drain of the field effect transistor Q2 and the resistor R5, the base of the transistor Q4 is connected between the drain of the field effect transistor Q2 and the resistor R5 through the resistor R1, and is connected to the charging status indication output terminal STAT pin of the control chip U1 through the resistor R2, and the charging status indication output terminal STAT pin of the control chip U1 is connected to the resistor R2 through the resistor R11 and the display light D1; in this embodiment, the display light D1 is a red and green LED bicolor light, the red indicator light indicates that the farad capacitor is being charged, and the green light indicates that charging is finished. By setting the reminder module, the user can be intuitively reminded of the current working status of the circuit.

[0032] Furthermore, the control module further includes a diode D3, a diode D4 and a resistor R6. Specifically, the anode of the diode D3 is connected to the cathode of the diode D2, the cathode of the diode D3 is connected to the anode of the diode D4, the cathode of the diode D4 is connected to the energy storage module, one end of the resistor R6 is grounded, and the other end is connected to the anode of the diode D4. By increasing the reverse breakdown voltage of the two diodes, the reverse breakdown voltage of the entire circuit can be made higher, and reverse discharge of the farad capacitor is also avoided.

[0033] Furthermore, the control module further includes a capacitor C4, one end of the capacitor C4 is connected between the cathode of the diode D2 and the anode of the diode D3, and the other end is grounded.

[0034] Furthermore, the protection module also includes a capacitor C3, one end of which is connected to the drain of the field effect tube Q2, and the other end is grounded. Capacitor C3 and capacitor C4 can achieve functions such as filtering and decoupling, filter out high-frequency noise or interference signals in the input voltage, thereby maintaining the purity of the circuit, and can also guide these high-frequency noises to the ground, thereby reducing the impact on the circuit and reducing the impact of DC bias.

[0035] Furthermore, the control module is provided with a power input terminal V1, which is connected to the positive power input terminal VIN pin of the control chip U1; V1 provides the required voltage for each part of the circuit so that the circuit can work normally.

[0036] The present application also provides an energy storage type emergency unlocking device, which includes: the above-mentioned energy storage type emergency unlocking power supply circuit.

[0037] The energy storage emergency unlocking power supply circuit is provided with a protection module, and the voltage regulator diode Z1, the transistor Q3 and the field effect transistor Q2 cooperate to control the power supply voltage of the subsequent circuit not to exceed the preset value, so as to provide overvoltage protection for the subsequent circuit; by setting the energy storage module as a plurality of Farad capacitors connected in series, a large amount of charge can be released in a short time, and a high power output can be provided, thereby improving the discharge current and charging efficiency; the energy storage emergency unlocking device adopts the energy storage emergency unlocking power supply circuit, which has a small overall size, is convenient and practical, and is easy to carry. It can be placed in a car or a carry-on bag without any flammable risk, and can be stored for a long time in various environments, has a long storage life, has no strict requirements on the ambient temperature and humidity, and is suitable for use at a temperature of -40 to 100°C, avoiding the problem of battery capacity attenuation of lithium batteries in cold weather; it can charge the built-in battery of the smart door lock, and can also directly power the smart door lock when the door lock battery voltage is reduced or the battery is damaged, resulting in failure to unlock normally, so that emergency unlocking can be achieved, and the usage scenarios are more extensive.

[0038] It should be noted that the present invention is not limited to the above-mentioned embodiments. According to the creative spirit of the present invention, those skilled in the art may also make other changes. These changes made according to the creative spirit of the present invention should be included in the scope of protection required by the present invention.

Claims

1. An energy storage emergency unlocking power supply circuit, characterized in that: It includes an input module J2, a protection module, a control module, an energy storage module and an output module J1 connected in sequence; The protection module includes a transistor Q3, a resistor R7, a resistor R8, a resistor R9, a voltage-stabilizing diode Z1 and a field effect transistor Q2, wherein the positive electrode of the voltage-stabilizing diode Z1 is grounded, the negative electrode of the voltage-stabilizing diode Z1 is connected to the input module J2 through the resistor R7, the emitter of the transistor Q3 is connected to the input module J2 and the source of the field effect transistor Q2 respectively, the base of the transistor Q3 is connected between the negative electrode of the voltage-stabilizing diode Z1 and the resistor R7 through the resistor R8, the collector of the transistor Q3 is connected to the gate of the field effect transistor Q2, and is connected to the positive electrode of the voltage-stabilizing diode Z1 through the resistor R9, and the drain of the field effect transistor Q2 is connected to the control module; The control module is used to control the charging voltage and charging current; The energy storage module includes a plurality of Farad capacitors connected in series; The input module J2 is used to connect to the input charging power supply, and the output module J1 is used to connect to the battery of the smart door lock.

2. The energy storage emergency unlocking power supply circuit according to claim 1, characterized in that: The control module includes a control chip U1, a field effect transistor Q1, an inductor L1, a diode D2, a resistor R3, a resistor R4 and a resistor R5; The gate of the field effect transistor Q1 is connected to the off-chip N-channel power transistor gate drive terminal LDRV pin of the control chip U1 through the resistor R3, the source of the field effect transistor Q1 is grounded, and is connected between the gate of the field effect transistor Q1 and the resistor R3 through the resistor R4, the drain of the field effect transistor Q1 is connected to the positive electrode of the diode D2, the battery voltage feedback input terminal BAT pin of the control chip U1 is connected to the negative electrode of the diode D2, the negative electrode of the diode D2 is connected to the energy storage module, the inductor L1 is connected in series between the inductor current detection negative input terminal CSN pin of the control chip U1 and the positive electrode of the diode D2, the resistor R5 is connected in series between the inductor current detection negative input terminal CSN pin of the control chip U1 and the drain of the field effect transistor Q2, and the power supply positive input terminal VIN pin and the chip enable input terminal CE pin of the control chip U1 are both connected between the drain of the field effect transistor Q2 and the resistor R5.

3. The energy storage emergency unlocking power supply circuit according to claim 2, characterized in that: The control module also includes a reminder module, which includes a transistor Q4, a display light D1, a resistor R1, a resistor R2, a resistor R10 and a resistor R11. The collector of the transistor Q4 is connected to the display light D1 through the resistor R10, the emitter of the transistor Q4 is connected between the drain of the field effect transistor Q2 and the resistor R5, the base of the transistor Q4 is connected between the drain of the field effect transistor Q2 and the resistor R5 through the resistor R1, and is connected to the charging status indication output terminal STAT pin of the control chip U1 through the resistor R2, and the charging status indication output terminal STAT pin of the control chip U1 is connected to the display light D1 through the resistor R11.

4. The energy storage emergency unlocking power supply circuit according to claim 2, characterized in that: The control module also includes a diode D3, a diode D4 and a resistor R6. The anode of the diode D3 is connected to the cathode of the diode D2, the cathode of the diode D3 is connected to the anode of the diode D4, the cathode of the diode D4 is connected to the energy storage module, one end of the resistor R6 is grounded, and the other end is connected to the anode of the diode D4.

5. The energy storage emergency unlocking power supply circuit according to claim 2, characterized in that: The model of the control chip U1 is CN3302.

6. The energy storage emergency unlocking power supply circuit according to claim 2, characterized in that: The control module further includes a capacitor C4 , one end of which is connected between the cathode of the diode D2 and the anode of the diode D3 , and the other end of which is grounded.

7. The energy storage emergency unlocking power supply circuit according to claim 1, characterized in that: The protection module further includes a capacitor C3, one end of which is connected to the drain of the field effect transistor Q2, and the other end of which is grounded.

8. The energy storage emergency unlocking power supply circuit according to claim 2, characterized in that: The control module is provided with a power input terminal V1, and the power input terminal V1 is connected to the power positive input terminal VIN pin of the control chip U1.

9. An energy storage emergency unlocking device, characterized in that: The energy storage type emergency unlocking device comprises: the energy storage type emergency unlocking power supply circuit as described in any one of claims 1-4.

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