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CN215343977U - Power supply circuit, power supply system and intelligent door lock - Google Patents

Power supply circuit, power supply system and intelligent door lock Download PDF

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Publication number
CN215343977U
CN215343977U CN202121054444.5U CN202121054444U CN215343977U CN 215343977 U CN215343977 U CN 215343977U CN 202121054444 U CN202121054444 U CN 202121054444U CN 215343977 U CN215343977 U CN 215343977U
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power supply
module
voltage
face recognition
switch tube
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CN202121054444.5U
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李雪春
张德建
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Beijing Sensetime Technology Development Co Ltd
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Beijing Sensetime Technology Development Co Ltd
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Priority to CN202121054444.5U priority Critical patent/CN215343977U/en
Priority to PCT/CN2021/126899 priority patent/WO2022242037A1/en
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    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The embodiment of the application provides a power supply circuit, a power supply system and an intelligent door lock, wherein the power supply circuit comprises a power supply battery, an anti-reverse connection module and a voltage boosting and reducing module, and the power supply circuit is used for supplying power to a face identification module; the positive electrode of the power supply battery is connected with the first end of the reverse connection prevention module, the second end of the reverse connection prevention module is connected with the input positive electrode of the buck-boost module, the output positive electrode of the buck-boost module is connected with the positive electrode power supply end of the face recognition module, and the negative electrode of the power supply battery, the input negative electrode of the buck-boost module, the output negative electrode of the buck-boost module and the negative electrode power supply end of the face recognition module are grounded; under the condition that the voltage of the power supply battery is greater than the power supply voltage of the face recognition module, the voltage boosting and reducing module works in a voltage reducing mode; and under the condition that the voltage of the power supply battery is less than the power supply voltage of the face recognition module, the voltage boosting and reducing module works in a voltage boosting mode. The embodiment of the application can prolong the endurance time of the face recognition module.

Description

Power supply circuit, power supply system and intelligent door lock
Technical Field
The application relates to the technical field of capacitance control, in particular to a power supply circuit, a power supply system and an intelligent door lock.
Background
At present, the face recognition technology begins to be popularized gradually at the intelligent door lock, more and more door lock manufacturers begin to release products of the face recognition intelligent door lock, non-contact door opening experience is achieved through the face recognition technology, and safety and convenience of the door lock are improved. The face recognition module has higher requirements on hardware, and accordingly has higher power consumption, and most of the existing face recognition intelligent door locks adopt a scheme that a lithium battery or a dry battery is added with a voltage reduction circuit for power supply.
However, the power supply method of the battery series voltage reduction circuit has the problems of insufficient battery discharge, short endurance time and the like.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a power supply circuit, a power supply system and an intelligent door lock, and the endurance time of a face recognition module can be prolonged.
A first aspect of an embodiment of the present application provides a power supply circuit, including a power supply battery, an anti-reverse module and a buck-boost module, where the power supply circuit is configured to supply power to a face recognition module, and the anti-reverse module is configured to cut off output of the power supply battery when a positive electrode and a negative electrode of the power supply battery are reversely connected;
the positive electrode of the power supply battery is connected with the first end of the reverse connection prevention module, the second end of the reverse connection prevention module is connected with the input positive electrode of the voltage boosting and reducing module, the output positive electrode of the voltage boosting and reducing module is connected with the positive electrode power supply end of the face recognition module, and the negative electrode of the power supply battery, the input negative electrode of the voltage boosting and reducing module, the output negative electrode of the voltage boosting and reducing module and the negative electrode power supply end of the face recognition module are grounded;
under the condition that the voltage of the power supply battery is greater than the power supply voltage of the face recognition module, the voltage boosting and reducing module works in a voltage reducing mode; and under the condition that the voltage of the power supply battery is less than the power supply voltage of the face recognition module, the voltage boosting and reducing module works in a voltage boosting mode.
The voltage rising and falling module can decide whether to work in the voltage falling mode or the voltage rising mode according to the voltage of the power supply battery and the power supply voltage of the face recognition module, not only can supply power for the face recognition module under the condition that the voltage of the power supply battery is greater than the power supply voltage of the face recognition module, but also can supply power for the face recognition module under the condition that the voltage of the power supply battery is less than the power supply voltage of the face recognition module, the electric energy of the power supply battery can be fully utilized, and the endurance time of the face recognition module is prolonged.
Optionally, the reverse connection preventing module includes a first switch tube, an anode of a parasitic diode of the first switch tube is connected to an anode of the power supply battery, and a cathode of the parasitic diode is connected to an input anode of the buck-boost module.
The first switch tube is used as the reverse connection prevention module, so that the whole circuit can be prevented from being burnt out when the power supply battery is reversely connected. Because the working voltage drop of the switching tube is far smaller than that of the diode, the power consumption of the switching tube is lower than that of the diode, the reverse connection prevention function can be realized, and the power consumption and the heat generation are obviously reduced.
Optionally, the reverse connection prevention module includes a first diode, a positive electrode of the first diode is connected to a positive electrode of the power supply battery, and a negative electrode of the first diode is connected to an input positive electrode of the buck-boost module.
The first diode is used as the reverse connection prevention module, the whole circuit can be prevented from being burnt out when the power supply battery is reversely connected, the power supply battery reverse connection prevention module can be used in scenes insensitive to power consumption, compared with the switching tube, the diode is lower in price, and the cost of the power supply circuit can be reduced.
Optionally, the buck-boost module includes a control module, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, a first capacitor, a second capacitor, and a first inductor;
the first end of the first capacitor is connected with the first end of the second switch tube and the second end of the first switch tube, the second end of the second switch tube is connected with the first end of the fifth switch tube and the first end of the first inductor, the second end of the first inductor is connected with the first end of the third switch tube and the first end of the fourth switch tube, the second end of the third switch tube is connected with the first end of the second capacitor and the positive power supply end of the face recognition module, and the second end of the first capacitor, the second end of the fourth switch tube, the second end of the fifth switch tube and the second end of the second capacitor are grounded;
control module includes first output interface, second output interface, third output interface and fourth output interface, first output interface connection the control end of second switch tube, second output interface connection the control end of third switch tube, third output interface connection the control end of fourth switch tube, fourth output interface connection the control end of fifth switch tube, the control end of first switch tube is connected the negative pole of power supply battery.
Wherein, two electric capacities of buck-boost module input and output design prevent that the input voltage and the output voltage of buck-boost module from taking place the sudden change to guarantee that the supply voltage of buck-boost module face identification module can not take place the sudden change when the mode switches, thereby guarantee the stable power supply of face identification module. Four switch tubes have been designed to the buck-boost module, and the operating condition through four switch tubes of control realizes step-down mode and step-up mode, because the response speed of switch tube is fast, can realize the mode switch fast, further guarantees the stable power supply of face identification module.
Optionally, under the condition that the voltage of the power supply battery is greater than the power supply voltage of the face recognition module, the control module controls the third switching tube to be turned on, the fourth switching tube to be turned off, and the second switching tube and the fifth switching tube to work in a first Pulse Width Modulation (PWM) mode.
Wherein, the state that goes up and down to press the module to can be through controlling second switch tube, third switch tube, fourth switch tube and fifth switch tube to control to go up and down to press the module work at the step-down mode, because the response speed of switch tube is fast, can realize the mode switch fast, guarantee the stable power supply of face identification module.
Optionally, in the first PWM mode, a duty ratio of a first PWM signal sent by the control module to the control terminal of the second switching tube and the control terminal of the fifth switching tube is D1, and D1 is Vout/Vin;
the Vout is an output positive voltage of the buck-boost module, and the Vin is an input positive voltage of the buck-boost module. The control module can adjust the control end of the second switch tube and the duty ratio of the first PWM signal of the control end of the fifth switch tube in real time according to the change of the input positive voltage of the buck-boost module, so that the output voltage of the buck-boost module can be maintained stable, and the stable power supply of the face recognition module is further ensured.
Optionally, under the condition that the voltage of the power supply battery is smaller than the power supply voltage of the face recognition module, the control module controls the second switch tube to be switched on, the fifth switch tube to be switched off, and the third switch tube and the fourth switch tube to work in a second PWM mode.
Wherein, the state that the module can pass through control second switch tube, third switch tube, fourth switch tube and fifth switch tube is pressed in the lift to control the work of module in the mode that steps up that presses, because the response speed of switch tube is fast, can realize the mode switch fast, guarantee the stable power supply of face identification module.
Optionally, in the second PWM mode, the duty ratio of a second PWM signal sent by the control module to the control terminal of the third switching tube and the control terminal of the fourth switching tube is D2, and D2 is 1-Vin/Vout;
the Vout is an output positive voltage of the buck-boost module, and the Vin is an input positive voltage of the buck-boost module.
The control module can adjust the control end of the third switch tube and the duty ratio of the second PWM signal of the control end of the fourth switch tube in real time according to the change of the input positive voltage of the buck-boost module, so that the output voltage of the buck-boost module can be maintained stable, and the stable power supply of the face recognition module is further ensured.
Optionally, the buck-boost module includes a buck circuit, a boost circuit, a sixth switching tube and a seventh switching tube;
the second end of the reverse connection preventing module is connected with the first end of the sixth switch tube and the first end of the seventh switch tube, the second end of the sixth switch tube is connected with the positive input end of the voltage reducing circuit, and the positive output end of the voltage reducing circuit is connected with the positive power supply end of the face recognition module; the second end of the seventh switch tube is connected with the positive input end of the booster circuit, and the positive output end of the booster circuit is connected with the positive power supply end of the face recognition module;
under the condition that the voltage of the power supply battery is greater than the power supply voltage of the face recognition module, the sixth switching tube is connected, and the seventh switching tube is disconnected; and under the condition that the voltage of the power supply battery is less than the power supply voltage of the face recognition module, the sixth switching tube is disconnected, and the seventh switching tube is connected.
Wherein, this application embodiment is through designing the parallelly connected step-up and step-down module of step-down circuit and boost circuit, can realize the switching of step-up and step-down module between step-down mode and step-up mode through the switching of two circuits, can reduce circuit design's complexity.
A second aspect of an embodiment of the present application provides a power supply system, including the power supply circuit and the face recognition module described in the first aspect.
The third aspect of the embodiment of the application provides an intelligent door lock, including above-mentioned first aspect supply circuit, face identification module and lock switch face image that face identification module gathered passes through under the circumstances that the face was verified, opens lock switch.
The embodiment of the application designs a contain power supply battery, prevent the power supply circuit of reverse connection module and buck-boost module, not only can be greater than the power supply voltage's of face identification module power supply for the face identification module under the condition of face identification module's power supply voltage at power supply battery's voltage, but also can be less than the power supply voltage's of face identification module under the condition for face identification module power supply at power supply battery's voltage, can make full use of power supply battery's electric energy, the time of endurance of extension face identification module.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a conventional power supply circuit;
fig. 2 is a schematic structural diagram of a power supply circuit provided in an embodiment of the present application;
fig. 3 is a schematic structural diagram of another power supply circuit provided in an embodiment of the present application;
fig. 4 is a schematic structural diagram of another power supply circuit provided in an embodiment of the present application;
fig. 5 is a schematic structural diagram of a buck-boost module provided in an embodiment of the present application;
fig. 6 is a schematic structural diagram of another buck-boost module provided in an embodiment of the present application;
fig. 7 is a schematic structural diagram of a power supply system according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of an intelligent door lock according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, system, article, or apparatus.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
At present, the face recognition technology is gradually popularized in intelligent door locks, more and more door lock manufacturers begin to release the categories of three-dimensional (3dimension, 3D) face recognition intelligent door locks, non-contact door opening experience is achieved through the face recognition technology, and safety and convenience of the door locks are improved. Compared with a door lock with fingerprint identification, the face identification module has higher requirements on hardware, and accordingly higher power consumption is achieved, and most of the existing face identification intelligent door lock adopts a scheme that a lithium battery or a dry battery is added with a voltage reduction circuit for power supply.
However, the current power supply scheme has the problems of insufficient battery discharge, short endurance time and the like.
At present, most of 3D face recognition modules only support 5V narrow voltage input, and a direct current-direct current (DC-DC) power supply chip for reducing voltage is required to be added when power supply with dry batteries connected in series is adopted. The endurance time of the step-down DC-DC power supply chip is short, and when the battery capacity is reduced to below 5.5V by connecting dry batteries in series, the step-down DC-DC power supply chip can not work. As shown in fig. 1, fig. 1 is a schematic structural diagram of a conventional power supply circuit, as shown in fig. 1. The battery is connected with the input end of the DC-DC power supply chip through the reverse connection prevention diode Df, and the output end of the DC-DC power supply chip is connected with the face recognition module.
The embodiment of the application provides a power supply circuit, a power supply system and an intelligent door lock, and the electric energy of a power supply battery can be fully utilized, so that the endurance time of a face recognition module is prolonged.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a power supply circuit according to an embodiment of the present disclosure. As shown in fig. 2, the power supply circuit 100 includes a power supply battery 10, an anti-reverse module 20 and a buck-boost module 30, the power supply circuit 100 is configured to supply power to the face recognition module 200, and the anti-reverse module 20 is configured to cut off the output of the power supply battery 100 when the positive electrode and the negative electrode of the power supply battery 10 are reversely connected;
the positive electrode of the power supply battery 10 is connected to the first end of the reverse connection prevention module 20, the second end of the reverse connection prevention module 20 is connected to the input positive electrode of the buck-boost module 30, the output positive electrode of the buck-boost module 30 is connected to the positive power supply end of the face recognition module 200, and the negative electrode of the power supply battery 10, the input negative electrode of the buck-boost module 30, the output negative electrode of the buck-boost module 30 and the negative power supply end of the face recognition module 200 are grounded;
under the condition that the voltage of the power supply battery 10 is greater than the power supply voltage of the face recognition module 200, the voltage increasing and decreasing module 30 works in a voltage decreasing mode; when the voltage of the power supply battery 10 is less than the power supply voltage of the face recognition module 200, the voltage boosting/reducing module 30 operates in a voltage boosting mode.
In the embodiment of the present application, the power supply battery 10 may be a lithium battery or a dry battery. Specifically, at least two lithium batteries or dry batteries connected in series may be included, so that the voltage of the lithium batteries or dry batteries connected in series after being connected in series can be greater than the power supply voltage supported by the face recognition module 200.
Generally, the supply voltage supported by the face recognition module 200 is 5V, and only small amplitude fluctuation is allowed. For example, the face recognition module 200 can only work normally in the interval of 4.9-5.1V, when the input voltage of the face recognition module 200 is not in the above interval, the face recognition module 200 may work abnormally, and the stability of the input voltage needs to be ensured in order to ensure the stable work of the face recognition module 200. For example, when the power supply voltage supported by the face recognition module 200 is 5V, 4 or more dry batteries of 1.5V may be connected in series as the power supply battery 10.
The main function of the reverse connection prevention module 20 is to prevent the current of the power supply battery 10 from flowing back to the components of the power supply circuit 100 and to prevent the entire power supply circuit 100 from being burnt out when the power supply battery 10 is reversely connected. The reverse connection preventing module 20 may employ a diode, a triode, a MOS transistor, or the like.
Buck-boost module 30 is a module that can be switched between buck mode and boost mode. The buck-boost module 30 can decide whether to work in the buck mode or the boost mode according to the voltage of the power supply battery 10 and the power supply voltage of the face recognition module 200, not only can supply power for the face recognition module 200 under the condition that the voltage of the power supply battery 10 is greater than the power supply voltage of the face recognition module 200, but also can supply power for the face recognition module 200 under the condition that the voltage of the power supply battery 10 is less than the power supply voltage of the face recognition module 200, the electric energy of the power supply battery 10 can be fully utilized, and the endurance time of the face recognition module 200 is prolonged.
The buck mode is a mode for converting an input high voltage into an output low voltage. In buck mode, buck-boost module 30 may convert an input high voltage to an output low voltage such that its output voltage is less than the input voltage. The boost mode is a mode for converting an input low voltage into an output high voltage. In the boost mode, the boost module may convert an input low voltage into an output high voltage such that the output voltage thereof is greater than the input voltage.
Specifically, under the condition that the voltage of the power supply battery 10 is greater than the power supply voltage of the face recognition module 200, the voltage step-down/step-down module 30 works in the voltage step-down mode, so that the voltage output by the voltage step-down/step-down module 30 is equal to the power supply voltage. Under the condition that the voltage of the power supply battery 10 is less than the power supply voltage of the face recognition module 200, the voltage boosting and reducing module 30 operates in a voltage boosting mode, so that the voltage output by the voltage boosting and reducing module 30 is equal to the power supply voltage.
Optionally, as shown in fig. 3, the reverse connection preventing module 20 includes a first switch Q1, a positive electrode of a parasitic diode D2 of the first switch Q1 is connected to the positive electrode of the power supply battery 10, and a negative electrode of the parasitic diode D2 is connected to the input positive electrode of the buck-boost module 30.
Because the power loss of the diode for preventing the reverse connection of the battery is large, the voltage of the diode is reduced to 0.5-0.7V when the face recognition module 200 works at full load, the instantaneous power consumption is large, and the heat of the diode is increased.
The embodiment of the application adopts the first switch tube Q1 as the reverse connection prevention module 20, so that the whole circuit can be prevented from being burnt out when the power supply battery 10 is reversely connected. Because the working voltage drop of the switching tube is far smaller than that of the diode, the power consumption of the switching tube is lower than that of the diode, the reverse connection prevention function can be realized, and the power consumption and the heat generation are obviously reduced.
Specifically, the first switch Q1 in fig. 3 is exemplified by a PMOS transistor, the first terminal of the first switch Q1 is a source (S) of the PMOS transistor, the second terminal of the first switch Q1 is a drain (drain D) of the PMOS transistor, and the control terminal of the first switch Q1 is a gate (gate, G) of the PMOS transistor. When the power supply battery 10 is connected positively, the parasitic diode of the PMOS tube is conducted, and the V of the PMOS tube is connectedGS＝-Vbat，VDSThe power supply battery 10 supplies power to the face recognition module 200 when the power supply is turned on; when the power supply battery 10 is reversely connected, VGS＝Vbat，VDSAnd the power supply circuit 100 is cut off to protect the safety.
Optionally, as shown in fig. 4, the reverse connection prevention module 20 includes a first diode D1, a positive electrode of the first diode D1 is connected to the positive electrode of the power supply battery 10, and a negative electrode of the first diode D1 is connected to the input positive electrode of the voltage step-up/step-down module 30.
The embodiment of the application adopts the first diode D1 as the reverse connection prevention module 20, can prevent the whole circuit from being burnt out when the power supply battery 10 is reversely connected, can be used in a scene insensitive to power consumption, and compared with a switch tube, the price of the diode is lower, and the cost of the power supply circuit 100 can be reduced.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a buck-boost module 30 according to an embodiment of the present disclosure, and as shown in fig. 5, the buck-boost module 30 includes a control module (not shown in fig. 5), a second switch Q2, a third switch Q3, a fourth switch Q4, a fifth switch Q5, a first capacitor C1, a second capacitor C2, and a first inductor;
a first end of the first capacitor C1 is connected to a first end of the second switch tube Q2 and a second end of the first switch tube Q1, a second end of the second switch tube Q2 is connected to a first end of the fifth switch tube Q5 and a first end of the first inductor, a second end of the first inductor is connected to a first end of the third switch tube Q3 and a first end of the fourth switch tube Q4, a second end of the third switch tube Q3 is connected to a first end of the second capacitor C2 and a positive power supply end of the face recognition module 200, and a second end of the first capacitor C1, a second end of the fourth switch tube Q4, a second end of the fifth switch tube Q5 and a second end of the second capacitor C2 are grounded;
the control module comprises a first output interface (not shown in fig. 5), a second output interface (not shown in fig. 5), a third output interface (not shown in fig. 5) and a fourth output interface (not shown in fig. 5), wherein the first output interface is connected with the control terminal of the second switching tube Q2, the second output interface is connected with the control terminal of the third switching tube Q3, the third output interface is connected with the control terminal of the fourth switching tube Q4, the fourth output interface is connected with the control terminal of the fifth switching tube Q5, and the control terminal of the first switching tube Q1 is connected with the negative electrode of the power supply battery 10.
In this embodiment, the control module may send control signals to the control terminal of the second switching tube Q2, the control terminal of the third switching tube Q3, the control terminal of the fourth switching tube Q4, and the control terminal of the fifth switching tube Q5 through the first output interface, the second output interface, the third output interface, and the fourth output interface, respectively, to control the switching tubes to be in any one of on, off, or PWM mode.
The buck-boost module 30 of this application embodiment prevents at two electric capacities of input and output design that the input voltage and the output voltage of buck-boost module 30 from taking place the sudden change to guarantee that the supply voltage of face identification module 200 can not take place the sudden change when the mode switch of buck-boost module 30, thereby guarantee face identification module 200's stable power supply. Four switch tubes are designed in the buck-boost module 30, the buck mode and the boost mode are realized by controlling the working states of the four switch tubes, and the mode switching can be quickly realized due to the high response speed of the switch tubes, so that the stable power supply of the face recognition module 200 is further ensured.
Optionally, when the voltage of the power supply battery 10 is greater than the power supply voltage of the face recognition module 200, the control module controls the third switching tube Q3 to be turned on, the fourth switching tube Q4 to be turned off, and the second switching tube Q2 and the fifth switching tube Q5 to operate in the first PWM mode, so that the buck-boost module 30 operates in the buck mode.
As shown in fig. 5, the first switch transistor Q1 is a PMOS transistor, and the second switch transistor Q2, the third switch transistor Q3, the fourth switch transistor Q4 and the fifth switch transistor Q5 are NMOS transistors. The anode of the parasitic diode of the second switching tube Q2 is connected to the second end of the second switching tube Q2 and the first end of the first inductor, and the cathode of the parasitic diode of the second switching tube Q2 is connected to the first end of the first capacitor C1. The anode of the parasitic diode of the third switching tube Q3 is connected to the second end of the first inductor, and the cathode of the parasitic diode of the third switching tube Q3 is connected to the first end of the second capacitor C2. The anode of the parasitic diode of the fourth switching tube Q4 is connected to the anode of the parasitic diode of the fifth switching tube Q5, the second end of the first capacitor C1 and the second end of the second capacitor C2, the cathode of the parasitic diode of the fourth switching tube Q4 is connected to the second end of the first inductor, and the cathode of the parasitic diode of the fifth switching tube Q5 is connected to the first end of the first inductor.
In the embodiment of the present application, the voltage boosting and reducing module 30 can control the states of the second switch tube Q2, the third switch tube Q3, the fourth switch tube Q4 and the fifth switch tube Q5, so as to control the voltage boosting and reducing module 30 to work in a voltage reducing mode, and since the response speed of the switch tubes is fast, the mode switching can be rapidly realized, and the stable power supply of the face recognition module 200 is ensured.
In the first PWM mode, the duty ratio of a first PWM signal sent by the control module to the control terminal of the second switching tube Q2 and the control terminal of the fifth switching tube Q5 is D1, and D1 is Vout/Vin;
the Vout is an output positive voltage of the buck-boost module 30, and the Vin is an input positive voltage of the buck-boost module 30.
The control module can adjust the control end of the second switch tube Q2 and the duty ratio of the first PWM signal of the control end of the fifth switch tube Q5 in real time according to the change of the input positive voltage of the buck-boost module 30, so that the output voltage of the buck-boost module 30 can be maintained stable, and the stable power supply of the face recognition module 200 is further ensured.
In the buck mode, the operation of the buck-boost module 30 is described below with reference to fig. 5. The first switch Q1 in fig. 5 is a PMOS transistor, the second switch Q2, the third switch Q3, the fourth switch Q4 and the fifth switch Q5 are all NMOS transistors, and the power supply voltage of the face recognition module 200 is 5V in fig. 5. When the voltage of the power supply battery 10 is larger than or equal to 5V, the first switching tube Q1 is turned on, the control module sends a first PWM signal to the control end of the second switching tube Q2 through the first output interface, the control module sends the first PWM signal to the control end of the fifth switching tube Q5 through the fourth output interface, the control module sends a high level signal to the control end of the third switching tube Q3 through the second output interface, and the control module sends a low level signal to the control end of the fourth switching tube Q4 through the third output interface. The control module controls the third switching tube Q3 to be switched on, the fourth switching tube Q4 to be switched off, and the second switching tube Q2 and the fifth switching tube Q5 to work in a first PWM mode. At this time, the second switch tube Q2, the third switch tube Q3, the fifth switch tube Q5, the first inductor and the second capacitor C2 form a buck (buck) circuit, so that the buck-boost module 30 operates in the buck mode. In the first PWM mode, the duty ratio of the first PWM signal sent by the control module to the control terminal of the second switching tube Q2 and the control terminal of the fifth switching tube Q5 is D1 ═ Vout/Vin.
In the embodiment of the present application, a voltage higher than 1V may be regarded as a high level signal, and a voltage lower than 0.3V may be regarded as a low level signal. For example, the high level signal may be defined as 3.3V or 5V, and the low level signal may be defined as 0V. The switching frequency of the first PWM signal may be set to several tens KHz or several hundreds KHz.
Optionally, when the voltage of the power supply battery 10 is less than the power supply voltage of the face recognition module 200, the control module controls the second switching tube Q2 to be turned on, the fifth switching tube Q5 to be turned off, and the third switching tube Q3 and the fourth switching tube Q4 to operate in the second PWM mode, so that the buck-boost module 30 operates in the boost mode.
In the embodiment of the present application, the voltage boosting and reducing module 30 can control the states of the second switch tube Q2, the third switch tube Q3, the fourth switch tube Q4 and the fifth switch tube Q5, so as to control the voltage boosting and reducing module 30 to work in a voltage boosting mode, and since the response speed of the switch tubes is fast, the mode switching can be rapidly realized, and the stable power supply of the face recognition module 200 is ensured.
In the second PWM mode, the duty cycle of a second PWM signal sent by the control module to the control terminal of the third switching transistor Q3 and the control terminal of the fourth switching transistor Q4 is D2, and D2 is 1-Vin/Vout;
the Vout is an output positive voltage of the buck-boost module 30, and the Vin is an input positive voltage of the buck-boost module 30.
The control module can adjust the control end of the third switch tube Q3 and the duty ratio of the second PWM signal of the control end of the fourth switch tube Q4 in real time according to the change of the input positive voltage of the buck-boost module 30, so that the output voltage of the buck-boost module 30 can be maintained stable, and the stable power supply of the face recognition module 200 is further ensured.
In the boost mode, the operation of the buck-boost module 30 is described below with reference to fig. 5. The first switch Q1 in fig. 5 is a PMOS transistor, the second switch Q2, the third switch Q3, the fourth switch Q4 and the fifth switch Q5 are all NMOS transistors, and the power supply voltage of the face recognition module 200 is 5V in fig. 5. When the voltage of the power supply battery 10 is within a 3-5V interval, the first switching tube Q1 is conducted, the control module sends a high level signal to the control end of the second switching tube Q2 through the first output interface, the control module sends a low level signal to the control end of the fifth switching tube Q5 through the fourth output interface, the control module sends a second PWM signal to the control end of the third switching tube Q3 through the second output interface, and the control module sends the second PWM signal to the control end of the fourth switching tube Q4 through the third output interface. The control module controls the second switching tube Q2 to be turned on, the fifth switching tube Q5 to be turned off, and the third switching tube Q3 and the fourth switching tube Q4 to work in the second PWM mode. At this time, the second switch tube Q2, the third switch tube Q3, the fourth switch tube Q4, the first inductor and the second capacitor C2 form a boost (boost) circuit, so that the buck-boost module 30 operates in a boost mode. In the second PWM mode, the duty ratio of the second PWM signal sent by the control module to the control terminal of the third switching transistor Q3 and the control terminal of the fourth switching transistor Q4 is D2 ═ 1-Vin/Vout.
In the embodiment of the present application, a voltage higher than 1V may be regarded as a high level signal, and a voltage lower than 0.3V may be regarded as a low level signal. For example, the high level signal may be defined as 3.3V or 5V, and the low level signal may be defined as 0V. The switching frequency of the first PWM signal may be set to several tens KHz or several hundreds KHz.
Optionally, please refer to fig. 6, where fig. 6 is a schematic structural diagram of another buck-boost module provided in the embodiment of the present application. As shown in fig. 6, the buck-boost module 30 includes a buck circuit 31, a boost circuit 32, a sixth switch Q6, and a seventh switch Q7;
the second end of the reverse connection preventing module 20 is connected to the first end of the sixth switch Q6 and the first end of the seventh switch Q7, the second end of the sixth switch Q6 is connected to the positive input end of the voltage reducing circuit 31, and the positive output end of the voltage reducing circuit 31 is connected to the positive power supply end of the face recognition module 200; a second end of the seventh switch Q7 is connected to the positive input end of the voltage boost circuit 32, and the positive output end of the voltage boost circuit 32 is connected to the positive power supply end of the face recognition module 200;
when the voltage of the power supply battery 10 is greater than the power supply voltage of the face recognition module 200, the sixth switching tube Q6 is turned on, and the seventh switching tube Q7 is turned off; when the voltage of the power supply battery 10 is lower than the power supply voltage of the face recognition module 200, the sixth switch Q6 is turned off, and the seventh switch Q7 is turned on.
The control end of the sixth switching tube Q6 and the control end of the seventh switching tube Q7 may be connected to a control module (not shown in fig. 6), and the control module controls the sixth switching tube Q6 and the seventh switching tube Q7 to be turned on or off.
When the voltage of the power supply battery 10 is greater than the power supply voltage of the face recognition module 200, the sixth switching tube Q6 is turned on, the seventh switching tube Q7 is turned off, the step-down circuit 31 operates, the step-up circuit 32 does not operate, and the step-up/step-down module 30 operates in the step-down mode. When the voltage of the power supply battery 10 is lower than the power supply voltage of the face recognition module 200, the sixth switching tube Q6 is turned off, the seventh switching tube Q7 is turned on, the voltage step-down circuit 31 does not work, the voltage step-up circuit 32 works, and the voltage step-up/step-down module 30 works in the voltage step-up mode.
The sixth switching tube Q6 and the seventh switching tube Q7 in fig. 6 are both exemplified by NMOS tubes.
By designing the buck-boost module 30 with the buck circuit 31 and the boost circuit 32 connected in parallel, the embodiment of the application can realize the switching of the buck-boost module 30 between the buck mode and the boost mode through the switching of the two circuits, and can reduce the complexity of circuit design.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a power supply system according to an embodiment of the present disclosure, and as shown in fig. 7, the power supply system 300 includes the power supply circuit 100 and the face recognition module 200 shown in fig. 1. The power supply circuit 100 supplies power to the face recognition module 200. The face recognition module may be a 3D face recognition module. The power supply system of the embodiment of the application can fully utilize the electric energy of the power supply battery and prolong the endurance time of the face recognition module.
Referring to fig. 8, fig. 8 is a schematic structural diagram of an intelligent door lock according to an embodiment of the present disclosure, as shown in fig. 8, the intelligent door lock 500 includes the power supply circuit 100, the face recognition module 200, and the door lock switch 400 shown in fig. 1, and when the face image acquired by the face recognition module 200 passes the face verification, the door lock switch 400 is turned on. The intelligent door lock of the embodiment of the application can fully utilize the electric energy of the power supply battery, and the endurance time of the face recognition module is prolonged.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one type of division of logical functions, and there may be other divisions when actually implementing, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not implemented.

Claims (11)

1. A power supply circuit is characterized by comprising a power supply battery, an anti-reverse module and a voltage boosting and reducing module, wherein the power supply circuit is used for supplying power to a face identification module, and the anti-reverse module is used for cutting off the output of the power supply battery when the positive electrode and the negative electrode of the power supply battery are reversely connected;
the positive electrode of the power supply battery is connected with the first end of the reverse connection prevention module, the second end of the reverse connection prevention module is connected with the input positive electrode of the voltage boosting and reducing module, the output positive electrode of the voltage boosting and reducing module is connected with the positive electrode power supply end of the face recognition module, and the negative electrode of the power supply battery, the input negative electrode of the voltage boosting and reducing module, the output negative electrode of the voltage boosting and reducing module and the negative electrode power supply end of the face recognition module are grounded;
under the condition that the voltage of the power supply battery is greater than the power supply voltage of the face recognition module, the voltage boosting and reducing module works in a voltage reducing mode; and under the condition that the voltage of the power supply battery is less than the power supply voltage of the face recognition module, the voltage boosting and reducing module works in a voltage boosting mode.
2. The power supply circuit according to claim 1, wherein the reverse connection prevention module comprises a first switch tube, an anode of a parasitic diode of the first switch tube is connected to an anode of the power supply battery, and a cathode of the parasitic diode is connected to an input anode of the buck-boost module.
3. The power supply circuit of claim 1, wherein the reverse connection prevention module comprises a first diode, wherein the anode of the first diode is connected with the anode of the power supply battery, and the cathode of the first diode is connected with the input anode of the voltage boosting and reducing module.
4. The power supply circuit of claim 2, wherein the buck-boost module comprises a control module, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, a first capacitor, a second capacitor and a first inductor;
the first end of the first capacitor is connected with the first end of the second switch tube and the second end of the first switch tube, the second end of the second switch tube is connected with the first end of the fifth switch tube and the first end of the first inductor, the second end of the first inductor is connected with the first end of the third switch tube and the first end of the fourth switch tube, the second end of the third switch tube is connected with the first end of the second capacitor and the positive power supply end of the face recognition module, and the second end of the first capacitor, the second end of the fourth switch tube, the second end of the fifth switch tube and the second end of the second capacitor are grounded;
control module includes first output interface, second output interface, third output interface and fourth output interface, first output interface connection the control end of second switch tube, second output interface connection the control end of third switch tube, third output interface connection the control end of fourth switch tube, fourth output interface connection the control end of fifth switch tube, the control end of first switch tube is connected the negative pole of power supply battery.
5. The power supply circuit according to claim 4, wherein the control module controls the third switching tube to be turned on, the fourth switching tube to be turned off, and the second switching tube and the fifth switching tube to operate in a first Pulse Width Modulation (PWM) mode under the condition that the voltage of the power supply battery is greater than the power supply voltage of the face recognition module.
6. The power supply circuit of claim 5, wherein in the first PWM mode, the duty cycle of the first PWM signal sent by the control module to the control terminal of the second switching tube and the control terminal of the fifth switching tube is D1, D1 is Vout/Vin;
the Vout is an output positive voltage of the buck-boost module, and the Vin is an input positive voltage of the buck-boost module.
7. The power supply circuit according to claim 4, wherein the control module controls the second switching tube to be turned on, the fifth switching tube to be turned off, and the third switching tube and the fourth switching tube to operate in a second PWM mode when the voltage of the power supply battery is less than the power supply voltage of the face recognition module.
8. The power supply circuit of claim 7, wherein in the second PWM mode, the duty cycle of the second PWM signal sent by the control module to the control terminal of the third switching tube and the control terminal of the fourth switching tube is D2, D2 is 1-Vin/Vout;
the Vout is an output positive voltage of the buck-boost module, and the Vin is an input positive voltage of the buck-boost module.
9. The power supply circuit according to any one of claims 1 to 3, wherein the buck-boost module comprises a buck circuit, a boost circuit, a sixth switching tube and a seventh switching tube;
the second end of the reverse connection preventing module is connected with the first end of the sixth switch tube and the first end of the seventh switch tube, the second end of the sixth switch tube is connected with the positive input end of the voltage reducing circuit, and the positive output end of the voltage reducing circuit is connected with the positive power supply end of the face recognition module; the second end of the seventh switch tube is connected with the positive input end of the booster circuit, and the positive output end of the booster circuit is connected with the positive power supply end of the face recognition module;
under the condition that the voltage of the power supply battery is greater than the power supply voltage of the face recognition module, the sixth switching tube is connected, and the seventh switching tube is disconnected; and under the condition that the voltage of the power supply battery is less than the power supply voltage of the face recognition module, the sixth switching tube is disconnected, and the seventh switching tube is connected.
10. A power supply system comprising the power supply circuit as claimed in any one of claims 1 to 9 and a face recognition module.
11. An intelligent door lock, characterized by comprising the power supply circuit, the face recognition module and the door lock switch according to any one of claims 1 to 9, wherein the door lock switch is opened when the face image collected by the face recognition module passes the face verification.
CN202121054444.5U 2021-05-17 2021-05-17 Power supply circuit, power supply system and intelligent door lock Active CN215343977U (en)

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CN202121054444.5U CN215343977U (en) 2021-05-17 2021-05-17 Power supply circuit, power supply system and intelligent door lock
PCT/CN2021/126899 WO2022242037A1 (en) 2021-05-17 2021-10-28 Power supply circuit, power supply system and smart door lock

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
WO2022242037A1 (en) * 2021-05-17 2022-11-24 北京市商汤科技开发有限公司 Power supply circuit, power supply system and smart door lock

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JP2004135478A (en) * 2002-10-15 2004-04-30 Fuji Electric Fa Components & Systems Co Ltd Step-up / step-down DC-DC converter
CN202007579U (en) * 2011-03-14 2011-10-12 汉王科技股份有限公司 Human face recognition door lock
TWI587603B (en) * 2013-09-09 2017-06-11 蘋果公司 Battery charger with buck-boost operation and method for charging a battery
JP2016092958A (en) * 2014-11-04 2016-05-23 株式会社デンソー Power supply circuit device
CN105701885A (en) * 2014-11-25 2016-06-22 上海天脉聚源文化传媒有限公司 Face identification access control system and implementation method thereof
CN215343977U (en) * 2021-05-17 2021-12-28 北京市商汤科技开发有限公司 Power supply circuit, power supply system and intelligent door lock

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022242037A1 (en) * 2021-05-17 2022-11-24 北京市商汤科技开发有限公司 Power supply circuit, power supply system and smart door lock

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