CN111756091B - Power switching circuit and smart door lock - Google Patents

Power switching circuit and smart door lock

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Publication number
CN111756091B
CN111756091B CN202010614444.XA CN202010614444A CN111756091B CN 111756091 B CN111756091 B CN 111756091B CN 202010614444 A CN202010614444 A CN 202010614444A CN 111756091 B CN111756091 B CN 111756091B
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CN
China
Prior art keywords
circuit
power supply
terminal
supply circuit
control unit
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Active
Application number
CN202010614444.XA
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Chinese (zh)
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CN111756091A (en
Inventor
陈煜平
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Shenzhen Oribo Technology Co Ltd
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Shenzhen Oribo Technology Co Ltd
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Priority to CN202010614444.XA priority Critical patent/CN111756091B/en
Publication of CN111756091A publication Critical patent/CN111756091A/en
Application granted granted Critical
Publication of CN111756091B publication Critical patent/CN111756091B/en
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Classifications

    • H02J7/855—
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
    • E05B47/0001—Operating or controlling locks or other fastening devices by electric or magnetic means with electric actuators; Constructional features thereof
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B49/00—Electric permutation locks; Circuits therefor ; Mechanical aspects of electronic locks; Mechanical keys therefor
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
    • E05B2047/0048—Circuits, feeding, monitoring
    • E05B2047/0057—Feeding

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  • Dc-Dc Converters (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

The embodiment of the application provides a power supply switching circuit and an intelligent door lock, and relates to the field of electronic equipment, wherein the power supply switching circuit comprises: the LDO power supply circuit is characterized in that a first wiring end of the LDO power supply circuit is connected with equipment to be powered, the DC-DC power supply circuit is connected with the equipment to be powered, the first wiring end of the DC-DC power supply circuit is connected with a reversing circuit, the first wiring end of the reversing circuit is connected with a second wiring end of the LDO power supply circuit, the control circuit is connected with a second wiring end of the reversing circuit, and the second wiring end of the DC-DC power supply circuit is connected with the control circuit. The application realizes the switching of the LDO power supply circuit and the DC-DC power supply circuit by using the control circuit, and can improve the service efficiency of the power supply to a certain extent.

Description

Power supply switching circuit and intelligent door lock
Technical Field
The application relates to the technical field of electronic equipment, in particular to a power supply switching circuit and an intelligent door lock.
Background
With the rapid development of technology, more and more electronic devices enter people's life. Currently, most electronic devices, particularly low-power electronic devices, can be powered by multiple power supplies, so that users can use the electronic devices conveniently. However, when the electronic device is powered by multiple power supplies, power loss tends to increase due to different power supply voltages of the power supplies.
Disclosure of Invention
The application aims to provide a power supply switching circuit and an intelligent door lock, which not only can improve the service efficiency of a power supply, but also are simple, flexible and easy to realize.
In a first aspect, an embodiment of the application provides a power supply switching circuit, which comprises an LDO power supply circuit, a DC-DC power supply circuit, a reversing circuit, a control circuit, a low level signal and a high level signal, wherein a first terminal of the LDO power supply circuit is connected with equipment to be powered, a first terminal of the DC-DC power supply circuit is connected with the equipment to be powered, a first terminal of the reversing circuit is connected with a second terminal of the LDO power supply circuit, a second terminal of the reversing circuit is connected with the control circuit, the control circuit sends the low level signal to the reversing circuit when the equipment to be powered is in a dormant state, the reversing circuit is utilized to switch the low level signal into the high level signal, so that the LDO power supply circuit supplies power to the equipment to be powered, and the control circuit respectively sends the high level signal to the reversing circuit and the DC-DC power supply circuit when the equipment to be powered is in an awake state, and switches the high level signal into the low level signal by the reversing circuit, so that the power supply circuit is cut off with the equipment to be powered, and the DC-DC power supply circuit is controlled to supply power to the equipment to be powered.
Further, the LDO power supply circuit comprises a first control unit, the first control unit is used for supplying power to the equipment to be powered when the LDO power supply circuit is conducted with the equipment to be powered, the DC-DC power supply circuit comprises a second control unit, the second control unit is used for supplying power to the equipment to be powered when the DC-DC power supply circuit is conducted with the equipment to be powered, a first wiring terminal of the inverting circuit is connected with an enabling end of the first control unit, and an enabling end of the second control unit is connected with the control circuit.
Further, the inverting circuit comprises a triode, a collector electrode of the triode is connected with an enabling end of the first control unit, a base electrode of the triode is connected with the control circuit, and an emitting electrode of the triode is grounded.
Further, the LDO power supply circuit further comprises a first resistor, the first resistor is connected with the first power supply, and a second terminal of the first resistor is connected with an enabling end of the first control unit and a collector electrode of the triode respectively.
Further, the inverting circuit further comprises a second resistor, a first terminal of the second resistor is connected with the enabling end of the first control unit and a second terminal of the first resistor respectively, and a second terminal of the second resistor is connected with a collector electrode of the triode.
Further, the inverting circuit further comprises a diode, the positive electrode of the diode is respectively connected with the base electrode of the triode and the control circuit, and the negative electrode of the diode is connected with the second power supply.
Further, the DC-DC power supply circuit is connected with a backflow prevention circuit, and the backflow prevention circuit is used for preventing backflow current from occurring between the first power supply and the third power supply.
The anti-backflow circuit further comprises a first MOS tube and a second MOS tube, wherein the drain electrode of the first MOS tube is connected with the LDO power supply circuit or the DC-DC power supply circuit, the source electrode of the first MOS tube is connected with the source electrode of the second MOS tube, the grid electrode of the first MOS tube is grounded, the source electrode of the second MOS tube is connected with a third power supply, and the grid electrode of the second MOS tube is grounded.
Further, the DC-DC power supply circuit further comprises an inductor and a first capacitor, a first terminal of the inductor is connected with an inductor current input end of a second control unit of the DC-DC power supply circuit, and a second terminal of the inductor is connected with a drain electrode of the first MOS tube.
In a second aspect, an embodiment of the present application provides an intelligent door lock, where the intelligent door lock system includes an intelligent door lock and the power switching circuit of the first aspect, and the intelligent door lock is electrically connected to the power switching circuit.
According to the power supply switching circuit and the intelligent door lock, the switching of the LDO power supply circuit and the DC-DC power supply circuit is realized by arranging the control circuit and the inverting circuit. The LDO power supply circuit comprises an LDO power supply circuit, a control circuit, a switching circuit and a DC-DC power supply circuit, wherein the first wiring end of the LDO power supply circuit is connected with equipment to be powered, the first wiring end of the DC-DC power supply circuit is connected with the equipment to be powered, the first wiring end of the switching circuit is connected with the second wiring end of the LDO power supply circuit, the second wiring end of the switching circuit is connected with the control circuit, the control circuit sends a low-level signal to the switching circuit when the equipment to be powered is in a dormant state, and switches the low-level signal to the switching circuit and the DC-DC power supply circuit by utilizing the switching circuit when the equipment to be powered is in a wake-up state, and the control circuit respectively sends the high-level signal to the switching circuit and the DC-DC power supply circuit and switches the high-level signal to the low-level signal so that the LDO power supply circuit and the equipment to be powered are cut off and controls the DC-DC power supply circuit to supply the equipment to be powered. According to the application, the switching of the LDO power supply circuit and the DC-DC power supply circuit can be realized more quickly and effectively by introducing the control circuit, so that the power supply waste can be reduced while the service efficiency of the power supply is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic block diagram of a power switching circuit provided by one embodiment of the present application;
FIG. 2 is a schematic diagram of an LDO power supply circuit in a power switching circuit according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a DC-DC power supply circuit in a power switching circuit provided by an embodiment of the present application;
FIG. 4 is a schematic block diagram of a power switching circuit provided in another embodiment of the present application;
FIG. 5 is a schematic diagram of a DC-DC power supply circuit in a power switching circuit according to another embodiment of the present application;
fig. 6 is a schematic structural diagram of an intelligent door lock system according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present application, it should be noted that the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediary, or in communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
At present, in order to improve the power consumption efficiency of low-power-consumption equipment, a low-power-consumption LDO (Low Dropout Regulator, low-dropout linear voltage regulator) is generally adopted for supplying power, peripheral devices are in an off state when in dormancy, and DC-DC is added for supplying power to the peripheral devices when in awakening. In the sleep state, the current consumed by the LDO is uA level, but the efficiency is low, but the consumed energy is low because the current is small, but in the wake state, the current consumed by the LDO is mA level, and the energy consumption is relatively large at this time, and particularly, in the case of relatively large voltage difference between input and output, the loss is further increased.
Accordingly, in view of the above problems, the inventors have proposed a power switching circuit and an intelligent door lock in the embodiments of the present application, and the embodiments of the present application will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 illustrates a schematic block diagram of a power switching circuit that may include an LDO supply circuit 110, a DC-DC supply circuit 120, a control circuit 140, and a device to be powered 150, according to an embodiment of the present application. Wherein, the first terminal of the LDO power supply circuit 110 is connected with the device 150 to be powered, the second terminal of the LDO power supply circuit 110 is connected with the control circuit 140, the first terminal of the DC-DC power supply circuit 120 is connected with the device 150 to be powered, and the second terminal of the DC-DC power supply circuit 120 is connected with the control circuit 140.
In one manner, a first terminal of the inverting circuit 130 is connected to a second terminal of the LDO supply circuit 110, and a second terminal of the inverting circuit 130 is connected to the control circuit 140. In the embodiment of the present application, the control circuit 140 is respectively connected to the inverting circuit 130 and the DC-DC power supply circuit 120, and when the to-be-powered device 150 is in a sleep state, the control circuit 140 sends a low-level signal to the inverting circuit 130, and switches the low-level signal to a high-level signal by using the inverting circuit 130, so that the LDO power supply circuit 110 supplies power to the to-be-powered device 150.
As a way, when the device 150 to be powered is in the wake-up state, the control circuit 140 sends high-level signals to the inverting circuit 130 and the DC-DC power supply circuit 120, and the inverting circuit 130 is used to switch the high-level signals to low-level signals, so that the LDO power supply circuit 110 and the device 150 to be powered are turned off, and meanwhile, the control circuit 140 may also control the DC-DC power supply circuit 120 to supply power to the device 150 to be powered, where the type of LDO may be SGM2202 and the DC-DC may be SY8120. Alternatively, the state of the device 150 to be powered may be represented by a high level "0", and the state of the device 150 to be powered may be represented by a low level "1", where the states obtained by the control circuit 140 are different, and the circuits for providing power to the device 150 to be powered are also different.
As one way, the device to be powered 150 may include at least one sub-device, each of the sub-devices is configured with a voltage terminal, and the control circuit 140 may detect whether the voltage of the voltage terminal on each of the sub-devices is less than a voltage threshold, and if the voltage of the voltage terminal on the sub-device is less than the voltage threshold, it indicates that the sub-device of the device to be powered 150 is in a sleep state, and at this time, the control circuit 140 may determine that the device to be powered 150 is in the sleep state. And when the voltage of the voltage end of the sub-device of the device to be powered 150 is greater than the voltage threshold, it indicates that the device to be powered 150 is in the complete machine wake-up state.
As a way, the sub-device of the to-be-powered device 150 may be configured with an enabling terminal, when the voltage of the enabling terminal is a low voltage, it indicates that the sub-device of the to-be-powered device 150 is in a sleep state, i.e. the to-be-powered device 150 is in a sleep state, and when the voltage of the enabling terminal is a high voltage, it indicates that the sub-device of the to-be-powered device 150 is in a wake-up state, i.e. the to-be-powered device 150 is in a complete machine wake-up state.
As one way, the control circuit 140 may also determine the state of the device to be powered 150 according to the device parameter sent by the device to be powered 150, that is, when the device parameter sent by the device to be powered 150 is the first parameter, the device to be powered 150 is in the sleep state, and when the device parameter sent by the device to be powered 150 is the second parameter, the device to be powered 150 is in the overall wake-up state. The first parameter and the second parameter may be parameters of the sub-device of the device to be powered 150 in different states. For example, when the computer screen is in a sleep state, the parameter is a first parameter, and when the computer screen is in an awake state, the parameter is a second parameter, and the first parameter and the second parameter are different because the voltages of the computer are different in the sleep state and the awake state. Therefore, the control circuit 140 can determine what state the device 150 to be powered is in according to the first parameter and the second parameter sent by the device to be powered, where the first parameter and the second parameter can be obtained through configuring an electronic device such as a voltage or a resistor.
In some embodiments, as shown in fig. 2, the LDO power supply circuit 110 may include a first control unit U1, where an input terminal of the first control unit U1 is connected to a first power source V1, where the first power source V1 may be vcc_bat, and the first control unit is mainly configured to supply power to the device to be powered 150 when the LDO power supply circuit 110 is turned on with the device to be powered 150. The enable end of the first control unit U1 may be connected to the inverting circuit 130, and the zero potential end of the first control unit U1 is grounded, where the LDO power supply circuit 110 may be connected to the device to be powered 150 through the test point TP 1. As shown in fig. 3, the DC-DC power supply circuit 120 may include a second control unit U2, an input end of the second control unit U2 is connected to the first power source V1, an enabling end of the second control unit U2 may be connected to the control circuit 140, a zero potential end of the second control unit U2 is grounded, the second control unit U2 is used to supply power to the to-be-powered device 150 when the DC-DC power supply circuit 120 is conducted to the to-be-powered device 150, and in the present application, the DC-DC power supply circuit 120 may be connected to the to-be-powered device 150 through a test point TP 2.
In some embodiments, the level state of the enable terminal of the first control unit U1 and the level state of the enable terminal of the second control unit U2 may be the same or different, that is, the enable terminal of the first control unit U1 may be an active high enable terminal, and the enable terminal of the first control unit U1 may also be an active low enable terminal. Similarly, the enabling terminal of the second control unit U2 may be an active high level enabling terminal, and the enabling terminal of the second control unit U1 may also be an active low level enabling terminal.
In the embodiment of the present application, when the level states of the enabling ends of the first control unit U1 and the second control unit U2 are the same, the power switching circuit 100 may include the inverting circuit 130, where the enabling end of the first control unit U1 is an enabling end with a high level and the enabling end of the second control unit U2 is an enabling end with a high level and the enabling end of the first control unit U1 is an enabling end with a low level and the enabling end of the second control unit U2 is an enabling end with a low level and the enabling end of the first control unit U1 is connected to the first terminal of the inverting circuit 130.
As one way, the first control unit U1 may be a low dropout linear regulator LDO, and the second control unit U2 may be a DC-DC, where when the level state of the enabling end of the first control unit U1 is the same as the level state of the enabling end of the second control unit U2, the first control unit U1 may be connected to the inverting circuit 130. The inverting circuit 130 may include a transistor Q1, where a collector of the transistor Q1 is connected to an enable terminal of the first control unit U1, a base of the transistor Q1 may be connected to the control circuit 140, and an emitter of the transistor Q1 is grounded.
As one way, the LDO power supply circuit 110 may further include a first resistor R1, where the first resistor R1 is connected to the first power source V1, and a second terminal of the first resistor R1 is connected to an enable terminal of the first control unit U1 and a collector of the transistor Q1, respectively. In addition, the inverting circuit 130 further includes a second resistor R2, where a first terminal of the second resistor R2 is connected to the enabling end of the first control unit U1 and a second terminal of the first resistor R1, and a second terminal of the second resistor R2 is connected to the collector of the triode Q1.
As one way, the inverting circuit 130 further includes a diode D1, where an anode of the diode D1 is connected to the base of the triode Q1 and the control circuit 140, and a cathode of the diode D1 is connected to the second power supply V2, where the second power supply V2 may be vcc_3v3_discontinune.
It should be noted that, when the level state of the enabling end of the first control unit U1 is different from the level state of the enabling end of the second control unit U2, the enabling end of the first control unit U1 is connected to the control circuit 140, and the enabling end of the second control unit U2 is also connected to the control circuit 140. Specifically, when the enabling end of the first control unit U1 is a high-level enabling end and the enabling end of the second control unit U2 is a low-level enabling end, the high-level enabling end of the first control unit U1 is connected to the control circuit 140, the low-level enabling end of the second control unit U2 is connected to the control circuit 140, and when the enabling end of the first control unit U1 is a low-level enabling end and the enabling end of the second control unit U2 is a high-level enabling end, the low-level enabling end of the first control unit U1 is connected to the control circuit 140, and the high-level enabling end of the second control unit U2 is connected to the control circuit 140.
As an alternative, as shown in fig. 2, the LDO power supply circuit 110 may further include a second capacitor C2 and a third capacitor C3, where first terminals of the second capacitor C2 and the third capacitor C3 are respectively connected to the first power source V1, and second terminals of the second capacitor C2 and the third capacitor C3 are respectively connected to an output terminal of the first control unit. In addition, the LDO power supply circuit 110 may further include a fourth capacitor C4, a fifth capacitor C5, and a sixth capacitor C6, where a first terminal of the fourth capacitor C4 is connected to the bypass end of the first control unit U1, a second terminal of the fourth capacitor C4 is connected to the output end of the first control unit, a first terminal of the fifth capacitor C5 and a first terminal of the sixth capacitor C6 are respectively connected to the output end of the first control unit U1, and a first terminal of the sixth capacitor C6 is connected to the fourth power supply V4. The fourth power supply V4 may be vcc_3v3_sgm2202.
As one way, the inverting circuit 130 may further include a third resistor R3, a fourth resistor R4, and a fifth resistor R5, where a first terminal of the third resistor R3 is connected to the base of the transistor Q1, a second terminal of the third resistor R3 is connected to a first terminal of the fifth resistor R5, a second terminal of the fifth resistor R5 is connected to the control circuit 140, and a first terminal of the fifth resistor R5 is further connected to a first terminal of the diode D1. The first terminal of the fourth resistor R4 is respectively connected with the base electrode of the triode Q1 and the first terminal of the third resistor R3, and the second terminal of the fourth resistor R4 is grounded. In addition, the inverting circuit 130 may further include a sixth capacitor C6, where a first terminal of the sixth capacitor C6 is connected to the base of the triode Q1 and the first terminal of the third resistor R3, respectively, and a second terminal of the sixth capacitor C6 is grounded, and the first terminal of the sixth capacitor C6 is also connected to the first terminal of the third resistor R3.
The power supply switching circuit provided by the embodiment of the application realizes the switching of the LDO power supply circuit and the DC-DC power supply circuit by arranging the control circuit. The LDO power supply circuit comprises an LDO power supply circuit, a control circuit, a switching circuit and a DC-DC power supply circuit, wherein the first wiring end of the LDO power supply circuit is connected with equipment to be powered, the first wiring end of the DC-DC power supply circuit is connected with the equipment to be powered, the first wiring end of the switching circuit is connected with the second wiring end of the LDO power supply circuit, the second wiring end of the switching circuit is connected with the control circuit, the control circuit sends a low-level signal to the switching circuit when the equipment to be powered is in a dormant state, and switches the low-level signal to the switching circuit and the DC-DC power supply circuit by utilizing the switching circuit when the equipment to be powered is in a wake-up state, and the control circuit respectively sends the high-level signal to the switching circuit and the DC-DC power supply circuit and switches the high-level signal to the low-level signal so that the LDO power supply circuit and the equipment to be powered are cut off and controls the DC-DC power supply circuit to supply the equipment to be powered. According to the application, the switching of the LDO power supply circuit and the DC-DC power supply circuit can be realized more quickly and effectively by introducing the control circuit, so that the power supply waste can be reduced while the service efficiency of the power supply is improved. In addition, the power supply switching circuit is more convenient and effective by introducing devices such as the triode, the diode, the resistor and the like, and the stability of the power supply switching circuit can be improved to a certain extent.
Referring to fig. 4, fig. 4 shows a schematic block diagram of a power switching circuit according to another embodiment of the present application, and it can be seen from fig. 4 that the power switching circuit 100 may include a backflow prevention circuit 160, where the DC-DC power supply circuit 120 is connected to the backflow prevention circuit 160, and the backflow prevention circuit 160 is mainly used to prevent backflow current between the first power source V1 and the third power source V3.
As one way, the DC-DC power supply circuit 120 is connected to the anti-backflow circuit 160, and the anti-backflow circuit 160 may include a first MOS transistor Q2 and a second MOS transistor Q3. The drain electrode of the first MOS transistor Q2 is connected to the DC-DC power supply circuit 120, the source electrode of the first MOS transistor Q2 is connected to the source electrode of the second MOS transistor Q3, and the source electrode of the second MOS transistor Q3 is connected to the third power supply V3. Wherein the third power supply V3 may be vcc_3v3_context.
Referring to fig. 5, the drain of the first MOS transistor Q2 of the anti-backflow circuit 160 is connected to the inductor current input end of the second control unit U2 of the DC-DC power supply circuit 120. In addition, the anti-backflow circuit 160 may further include a ninth resistor R9, a tenth resistor R10, and a triode Q4, wherein a first terminal of the ninth resistor R9 is connected to a source of the first MOS transistor Q2, a second terminal of the ninth resistor R9 is connected to a gate of the first MOS transistor Q2 and the triode Q4, a first terminal of the tenth resistor R10 is connected to a gate of the second MOS transistor Q3, a second terminal of the tenth resistor R10 is connected to the gate of the first MOS transistor Q2, a second terminal of the ninth resistor R9, and the triode Q4, an emitter of the triode Q4 is connected to a ground terminal of the second control unit U2, and a collector of the triode is connected to the gate of the first MOS transistor Q1, a second terminal of the tenth resistor R10, and a second terminal of the ninth resistor R9.
As one way, the DC-DC power supply circuit 120 further includes an inductor L1 and a first capacitor C1, where a first terminal of the inductor L1 is connected to the inductor current input end of the second control unit U2, and a second terminal of the inductor L1 is connected to the drain electrode of the first MOS transistor Q2. The DC-DC power supply circuit 120 further includes a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8, where a first terminal of the sixth resistor R6 is connected to the second terminal of the inductor L1 and the drain of the first MOS transistor Q2, a second terminal of the sixth resistor R6 is connected to the first terminal of the seventh resistor R7 and the feedback end of the second control unit U2, a first terminal of the seventh resistor R7 is connected to the feedback end of the second control unit U2, a second terminal of the seventh resistor R7 is connected to the second terminal of the emitter of the triode Q4, a first terminal of the eighth resistor R8 is connected to the enabling end of the second control unit U2 and the control circuit 140, and a second terminal of the eighth resistor R8 is connected to the second terminal of the seventh resistor and the emitter of the triode Q4.
As one way, the DC-DC power supply circuit 120 further includes a seventh capacitor C7 and an eighth capacitor C8, where first terminals of the seventh capacitor C7 and the eighth capacitor C8 are connected to the first power source V1, respectively, and second terminals of the seventh capacitor C7 and the eighth capacitor C8 are connected to the second terminal of the seventh resistor R7, the second terminal of the eighth resistor R8, and the emitter of the transistor Q4, respectively.
As one way, the DC-DC power supply circuit 120 further includes a ninth capacitor C9, an eleventh resistor R11, and a twelfth resistor R12, where first terminals of the ninth capacitor C9 and the eleventh resistor R11 are connected to the second terminal of the inductor L1 and the drain of the first MOS transistor Q2, respectively, a first terminal of the eleventh resistor R11 is connected to the second power source V2, and a second terminal of the eleventh resistor R11 is connected to the first terminal of the twelfth resistor R12 and the base of the triode Q4, respectively. The second terminals of the ninth capacitor C9 and the twelfth resistor are respectively connected with the second terminal of the seventh capacitor C7, the second terminal of the eighth capacitor C8, the second terminal of the seventh resistor R7, the second terminal of the eighth resistor R8 and the emitter of the triode Q4, and the second terminal of the twelfth resistor R12 is grounded.
As an example, the control circuit 140 in the embodiment of the present application may include a signal output terminal, through which the control circuit may output a control signal to the LDO supply circuit 110 and the DC-DC supply circuit 120, respectively, wherein the signal output terminal of the control circuit 140 may be ec_3v3_discontinuum. In other words, the control circuit 140 may be connected to the LDO supply circuit 110 and the DC-DC supply circuit 120 via signal outputs, respectively.
As an example, when the voltage of 3.3V output by the second control unit U2 is stable, the state of vcc_3v3_discontinue is 1, and since en_3v3_discontinue is also 1 in the awake state, the transistor Q1 can be driven to be turned on, the enabling end of the first control unit U1 is set low, avoiding the current loss of the first control unit U1, and when the voltage of 3.3V output by the second control unit U2 is not stable, the state of vcc_3v3_discontinue is 0, although en_3v3_discontinue is also 1 in the awake state, vcc_3v3_discontinue will block the transistor Q1, and the transistor Q1 is turned off, thereby the first control unit U1 is normally powered to avoid the system from being powered down.
The power supply switching circuit provided by the embodiment of the application realizes the switching of the LDO power supply circuit and the DC-DC power supply circuit by arranging the control circuit. The LDO power supply circuit comprises a first wiring terminal, a control circuit, a DC-DC power supply circuit, a control circuit and a control circuit, wherein the first wiring terminal of the LDO power supply circuit is connected with equipment to be powered, the first wiring terminal of the DC-DC power supply circuit is connected with the equipment to be powered, the second wiring terminal of the LDO power supply circuit is connected with the control circuit, the control circuit is used for controlling the LDO power supply circuit to supply power to the equipment to be powered under the condition that the equipment to be powered is in a dormant state, and the control circuit is used for controlling the DC-DC power supply circuit to supply power to the equipment to be powered under the condition that the equipment to be powered is in a complete machine awakening state. According to the application, the switching of the LDO power supply circuit and the DC-DC power supply circuit can be realized more quickly and effectively by introducing the control circuit, so that the power supply waste can be reduced while the service efficiency of the power supply is improved. In addition, the application introduces the anti-backflow circuit, which not only can avoid current backflow caused by different multi-path power supply potentials, but also can save energy consumption and ensure high-efficiency charging of equipment, and meanwhile, the application can judge whether the action of completely stopping the first control unit is completely triggered and enabled by a hardware circuit according to the stability of the second control unit, so that the application has higher stability compared with software control.
Referring to fig. 6, fig. 6 shows a schematic structural diagram of an intelligent door lock system according to an embodiment of the present application, where the intelligent door lock system includes an intelligent door lock and the above power switching circuit, and the intelligent door lock is electrically connected to the power switching circuit.
The power supply switching circuit provided by the embodiment of the application realizes the switching of the LDO power supply circuit and the DC-DC power supply circuit by arranging the control circuit. The LDO power supply circuit comprises an LDO power supply circuit, a control circuit, a switching circuit and a DC-DC power supply circuit, wherein the first wiring end of the LDO power supply circuit is connected with equipment to be powered, the first wiring end of the DC-DC power supply circuit is connected with the equipment to be powered, the first wiring end of the switching circuit is connected with the second wiring end of the LDO power supply circuit, the second wiring end of the switching circuit is connected with the control circuit, the control circuit sends a low-level signal to the switching circuit when the equipment to be powered is in a dormant state, and switches the low-level signal to the switching circuit and the DC-DC power supply circuit by utilizing the switching circuit when the equipment to be powered is in a wake-up state, and the control circuit respectively sends the high-level signal to the switching circuit and the DC-DC power supply circuit and switches the high-level signal to the low-level signal so that the LDO power supply circuit and the equipment to be powered are cut off and controls the DC-DC power supply circuit to supply the equipment to be powered. The application can more quickly and effectively realize the switching of the LDO power supply circuit and the DC-DC power supply circuit by introducing the control circuit, can reduce the power waste while improving the service efficiency of the power supply, and has simple and easy-to-realize circuit connection between the devices, namely the power supply switching circuit provided by the embodiment of the application has simple and flexible design and low cost.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (7)

1. A power switching circuit, the power switching circuit comprising:
The LDO power supply circuit (110) is connected with equipment (150) to be powered, wherein the LDO power supply circuit (110) comprises a first control unit (U1), and the first control unit (U1) is used for supplying power to the equipment (105) to be powered when the LDO power supply circuit (110) is conducted with the equipment (105) to be powered;
The DC-DC power supply circuit (120) is connected with the equipment (150) to be powered, wherein the DC-DC power supply circuit (120) comprises a second control unit (U2), and the second control unit (U2) is used for supplying power to the equipment (105) to be powered when the DC-DC power supply circuit (120) is conducted with the equipment (105) to be powered;
The LDO power supply circuit comprises an inverting circuit (130), wherein a first terminal of the inverting circuit (130) is connected with a second terminal of the LDO power supply circuit (110), a first terminal of the inverting circuit (130) is connected with an enabling terminal of a first control unit (U1) of the LDO power supply circuit (110), an enabling terminal of a second control unit (U2) of the DC-DC power supply circuit (120) is connected with a control circuit (140), the inverting circuit (130) comprises a triode (Q1) and a diode (D1), a collector of the triode (Q1) is connected with an enabling terminal of the first control unit (U1), a base of the triode (Q1) is connected with the control circuit (140), an emitter of the triode (Q1) is grounded, a positive electrode of the diode (D1) is respectively connected with a base of the triode (Q1) and the control circuit (140), and a negative electrode of the diode (D1) is connected with a second power supply (V2);
The control circuit (140), the second terminal of the inverting circuit (130) is connected with the control circuit (140), the second terminal of the DC-DC power supply circuit (120) is connected with the control circuit (140), when the to-be-powered device (150) is in a dormant state, the control circuit (140) sends a low-level signal to the inverting circuit (130), and switches the low-level signal to a high-level signal by using the inverting circuit (130), so that the LDO power supply circuit (110) supplies power to the to-be-powered device (150), and when the to-be-powered device (150) is in a wake-up state, the control circuit (140) respectively sends a high-level signal to the inverting circuit (130) and the DC-DC power supply circuit (120), and switches the high-level signal to a low-level signal by using the inverting circuit (130), so that the LDO power supply circuit (110) and the to-be-powered device (150) are cut off, and controls the DC-DC power supply circuit (120) to be-powered device (150) to supply power.
The control circuit (140) further comprises a signal output end, the signal output end outputs control signals to the LDO power supply circuit (110) and the DC-DC power supply circuit (120) respectively, when the voltage of 3.3V output by the second control unit (U2) is not stable, the triode (Q1) is embedded at the signal output end so that the triode (Q1) is cut off, and the first control unit (U1) supplies power for the equipment (105) to be powered.
2. The power switching circuit according to claim 1, wherein the LDO supply circuit (110) further comprises a first resistor (R1), the first resistor (R1) being connected to a first power supply (V1), a second terminal of the first resistor (R1) being connected to an enable terminal of the first control unit (U1) and a collector of a transistor (Q1), respectively.
3. The power switching circuit according to claim 2, wherein the inverting circuit (130) further comprises a second resistor (R2), a first terminal of the second resistor (R2) being connected to the enable terminal of the first control unit (U1) and a second terminal of the first resistor (R1), respectively, a second terminal of the second resistor (R2) being connected to the collector of the transistor (Q1).
4. A power switching circuit according to any one of claims 1 to 3, wherein the DC-DC supply circuit (120) is connected to a reverse current prevention circuit (160), the reverse current prevention circuit (160) being configured to prevent a reverse current from occurring between the first power supply (V1) and the third power supply (V3).
5. The power switching circuit according to claim 4, wherein the anti-backflow circuit (160) comprises a first MOS tube (Q2) and a second MOS tube (Q3);
The drain electrode of the first MOS tube (Q2) is connected with the LDO power supply circuit (110) or the DC-DC power supply circuit (120), the source electrode of the first MOS tube (Q2) is connected with the source electrode of the second MOS tube (Q3), and the grid electrode of the first MOS tube (Q2) is grounded;
the source electrode third power supply (V3) of the second MOS tube (Q3) is connected, and the grid electrode of the second MOS tube (Q3) is grounded.
6. The power supply switching circuit according to claim 5, wherein the DC-DC supply circuit (120) further comprises an inductor (L1) and a first capacitor (C1), a first terminal of the inductor (L1) being connected to an inductor current input of a second control unit (U2) of the DC-DC supply circuit (120), a second terminal of the inductor (L1) being connected to a drain of the first MOS transistor (Q2).
7. An intelligent door lock system, characterized in that the intelligent door lock system (200) comprises an intelligent door lock (210) and a power supply switching circuit (100) according to any one of claims 1-6, the intelligent door lock (210) being electrically connected to the power supply switching circuit (100).
CN202010614444.XA 2020-06-30 2020-06-30 Power switching circuit and smart door lock Active CN111756091B (en)

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CN112558677B (en) * 2020-12-09 2022-06-24 思瑞浦微电子科技（苏州）股份有限公司 Low dropout regulator based on reverse current protection
CN114265464B (en) * 2022-03-02 2022-05-20 南京沁恒微电子股份有限公司 A low-power power supply system with precharge function and its control method

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CN212462838U (en) * 2020-06-30 2021-02-02 深圳市欧瑞博科技股份有限公司 Power supply switching circuit and intelligent door lock system

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CN110676830A (en) * 2019-10-31 2020-01-10 深圳市欧瑞博科技有限公司 Current anti-backflow circuit and intelligent door lock system
CN212462838U (en) * 2020-06-30 2021-02-02 深圳市欧瑞博科技股份有限公司 Power supply switching circuit and intelligent door lock system

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