Power supply control circuit, power supply control method and device

Abstract

The invention discloses a power supply control circuit, a power supply control method and a power supply control device. The power supply control circuit comprises a first power module, a second power module and a switch module; the first power module is connected with the power utilization module; the second power module is connected with the power utilization module through the switch module; when the voltage of the first power supply module is greater than or equal to the threshold voltage, the switch module is switched off, and the first power supply module is used for supplying power to the power utilization module; and under the condition that the voltage of the first power supply module is smaller than the threshold voltage, the switch module is switched on, and the second power supply module is used for supplying power to the power utilization module. According to the embodiment of the invention, the power supply reliability can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of power supply control, and in particular to a power supply control circuit, a power supply control method and a power supply control device. Background Art

[0002] With the rapid development of social economy and the continuous advancement of automobile technology, the number of cars in use is increasing. Cars have gradually become an indispensable means of transportation in people's daily lives. Batteries are installed as power sources to power the power modules in the car and are an indispensable component in the car.

[0003] However, in the event of an abnormality in the power supply, the power-consuming module may lose power, causing the power-consuming components to be unable to continue working. Summary of the invention

[0004] The present application provides a power supply control circuit, a power supply control method and a power supply control device, which can improve power supply reliability.

[0005] In a first aspect, the present application provides a power supply control circuit, comprising a first power module, a second power module and a switch module; the first power module is connected to a power-consuming module; the second power module is connected to the power-consuming module through the switch module; when the voltage of the first power module is greater than or equal to a threshold voltage, the switch module is turned off, and the first power module is used to supply power to the power-consuming module; when the voltage of the first power module is less than the threshold voltage, the switch module is turned on, and the second power module is used to supply power to the power-consuming module.

[0006] In an embodiment of the present application, a second power supply module and a switch module are provided, and the second power supply module is connected to the power-consuming module through the switch module. When the voltage of the first power supply module is less than a threshold voltage, the second power supply module can be started to supply power to the power-consuming module. In this way, when the first power supply module is disconnected or the voltage drops, the power-consuming module can continue to work, thereby improving the power supply reliability.

[0007] In a possible implementation manner of the first aspect, the second power module is connected to the first power module, and the second power module is further used to receive and store electrical energy from the first power module.

[0008] In this way, the electric energy stored in the second power module can come from the first power module, so there is no need to introduce an additional power supply, which is conducive to simplifying the structure and reducing costs.

[0009] In a possible implementation of the first aspect, the second power module includes an energy storage control submodule and an energy storage submodule, the energy storage control submodule is connected to the first power module and the energy storage submodule, and the energy storage submodule is connected to the switch module;

[0010] The energy storage control submodule is used to control the energy storage submodule to receive and store the electric energy of the first power module;

[0011] The energy storage submodule is used to store electric energy when the switch module is turned off, and release electric energy to the power consumption module when the switch module is turned on.

[0012] According to the embodiment of the present application, through the control of the energy storage control submodule and the storage and release of electric energy by the energy storage submodule, it is possible to store electric energy from the first power supply module and supply power to the power-consuming module when the switch module is turned on.

[0013] In a possible implementation of the first aspect, the energy storage control submodule includes an inductor, a first switch, and a first diode, and the energy storage submodule includes a capacitor;

[0014] A first end of the inductor is connected to the first power module, and a second end of the inductor is connected to a first end of the first switch and an anode of the first diode;

[0015] The second end of the first switch is grounded, and the control end of the first switch is connected to the pulse width modulation signal;

[0016] The cathode of the first diode is connected to the first electrode of the capacitor;

[0017] The first electrode of the capacitor is connected to the switch module, and the second electrode of the capacitor is grounded.

[0018] The first switch can be controlled to be alternately turned on and off, so that the inductor, the first switch, the first diode and the capacitor can form a boost circuit.

[0019] In a possible implementation of the first aspect, the power supply control circuit also includes a voltage detection module, which is connected to the first power supply module and the switch module. The voltage detection module is used to detect the voltage of the first power supply module, and control the switch module to be turned off when the voltage of the first power supply module is greater than or equal to a threshold voltage, and control the switch module to be turned on when the voltage of the first power supply module is less than the threshold voltage.

[0020] In the embodiment of the present application, by setting up a voltage detection module, the voltage of the first power module can be detected, and then it can be determined whether the first power module has abnormalities such as disconnection or voltage drop, so as to accurately control the state of the switch module.

[0021] In a possible implementation of the first aspect, the voltage detection module includes a comparator, a first input end of the comparator is connected to the first power supply module, a second input end of the comparator is connected to the reference power supply, and an output end of the comparator is connected to the control end of the switch module;

[0022] The comparator is used to control the switch module to be turned on when the voltage at the first input terminal is less than the voltage at the second input terminal, and to control the switch module to be turned off when the voltage at the first input terminal is greater than or equal to the voltage at the second input terminal.

[0023] The comparator structure is relatively simple, so the voltage of the first power module and the state of the switch module can be matched simply and conveniently.

[0024] In a possible implementation manner of the first aspect, the first input terminal is an inverting input terminal of the comparator, and the second input terminal is a non-inverting input terminal of the comparator;

[0025] Alternatively, the first input terminal is a non-inverting input terminal of the comparator, and the second input terminal is an inverting input terminal of the comparator.

[0026] In a possible implementation of the first aspect, the voltage detection module further includes:

[0027] A first voltage divider submodule, wherein a first end of the first voltage divider submodule is connected to a first power supply module, a second end of the first voltage divider submodule is grounded, a third end of the first voltage divider submodule is connected to a first input end, and a voltage of the third end of the first voltage divider submodule is between a voltage of the first end of the first voltage divider submodule and a voltage of the second end of the first voltage divider submodule.

[0028] In a possible implementation of the first aspect, the voltage detection module also includes: a second voltage divider submodule, a first end of the second voltage divider submodule is connected to a reference power supply, a second end of the second voltage divider submodule is grounded, a third end of the second voltage divider submodule is connected to the second input end, and a voltage at the third end of the second voltage divider submodule is between a voltage at the first end of the second voltage divider submodule and a voltage at the second end of the second voltage divider submodule.

[0029] In a possible implementation of the first aspect, the voltage detection module further includes: a voltage stabilizing submodule, the voltage stabilizing submodule is connected to the output end of the comparator and the control end of the switch module, and the voltage stabilizing submodule is used to initialize the voltage of the control end of the switch module.

[0030] In the embodiment of the present application, the first voltage-dividing submodule can divide the voltage of the first power module, and the second voltage-dividing submodule can divide the voltage of the reference power supply, so that when the voltage of the first power module and / or the reference power supply is large, the normal operation of the comparator can be guaranteed. The initialization submodule can be used to initialize the voltage of the control end of the switch module, thereby initializing the state of the switch module and further improving the circuit reliability.

[0031] In a possible implementation of the first aspect, the first voltage divider submodule includes a first resistor and a second resistor, the first end of the first resistor is connected to the first power supply module, the second end of the first resistor is connected to the first end of the second resistor and the first input end, and the second end of the second resistor is grounded.

[0032] In a possible implementation of the first aspect, the second voltage divider submodule includes a third resistor and a fourth resistor, the first end of the third resistor is connected to the reference power supply, the second end of the third resistor is connected to the first end and the second input end of the fourth resistor, and the second end of the fourth resistor is grounded.

[0033] In a possible implementation of the first aspect, the initialization submodule includes a fifth resistor, a first end of the fifth resistor is connected to the output end of the comparator and the control end of the switch module, and a second end of the fifth resistor is grounded.

[0034] In the embodiment of the present application, the voltage division submodule includes resistors connected in series to perform voltage division, and the initialization submodule includes a resistor connected to ground. While achieving voltage division and initialization, the structure is relatively simple.

[0035] In a possible implementation manner of the first aspect, the power supply control circuit further includes:

[0036] A first unidirectional conduction module, wherein the first power supply module is connected to the power consumption module via the first unidirectional conduction module;

[0037] And / or, a second unidirectional conduction module, the second power supply module is connected to the power consumption module through the second unidirectional conduction module.

[0038] In an embodiment of the present application, the first unidirectional conduction module can be used to prevent the electrical signal of the power-consuming module from flowing back to the first power supply module, thereby improving the stability of the first power supply module; the second unidirectional conduction module can be used to prevent the electrical signal of the power-consuming module from flowing back to the second power supply module, thereby improving the stability of the second power supply module.

[0039] It is understandable that the second unidirectional conduction module is connected to the output end of the second power module, so that the second unidirectional conduction module can also be used to prevent the electrical signal of the first power module from flowing back to the second power module from the output end of the second power module.

[0040] In a possible implementation manner of the first aspect, the first unidirectional conduction module includes a second diode, an anode of the second diode is connected to the first power module, and a cathode of the second diode is connected to the power module;

[0041] And / or, the second unidirectional conducting module includes a third diode, the anode of the third diode is connected to the second power supply module, and the cathode of the third diode is connected to the switch module.

[0042] The diode has a unidirectional conduction characteristic. The second diode is used to achieve unidirectional conduction between the first power module and the power module, and the third diode is used to achieve unidirectional conduction between the second power module and the power module. The structure is simple and the cost is low.

[0043] Based on the same inventive concept, in a second aspect, an embodiment of the present application provides a device, comprising a power consumption module and a power supply control circuit as described in any embodiment of the first aspect.

[0044] Based on the same inventive concept, in the third aspect, an embodiment of the present application provides a power supply control method, including: when the voltage of the first power module is greater than or equal to a threshold voltage, controlling the first power module to supply power to the power-consuming module; when the voltage of the first power module is less than the threshold voltage, controlling the second power module to supply power to the power-consuming module.

[0045] In an embodiment of the present application, when the voltage of the first power module is less than the threshold voltage, the second power module can be started to supply power to the power-consuming module. In this way, when the first power module is disconnected or the voltage drops, the power-consuming module can continue to work, thereby improving the power supply reliability.

[0046] In a possible implementation of the first aspect, the method further includes:

[0047] The voltage of the first power module is detected, and the magnitude relationship between the voltage of the first power module and the threshold voltage is compared.

[0048] In the embodiment of the present application, by detecting the voltage of the first power module, it is possible to determine whether the first power module has abnormalities such as disconnection or voltage drop, so as to accurately control the power supply status of the two power supplies. The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented according to the contents of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are specifically cited below. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0050] Figure 1 This is a schematic diagram of the structure of a power supply control circuit according to an embodiment of the present application;

[0051] Figure 2 This is a structural schematic diagram of a power supply control circuit according to another embodiment of the present application;

[0052] Figure 3 This is a structural schematic diagram of a power supply control circuit according to another embodiment of the present application;

[0053] Figure 4 This is a structural schematic diagram of a power supply control circuit according to another embodiment of the present application;

[0054] Figure 5 This is a structural schematic diagram of a power supply control circuit according to another embodiment of the present application;

[0055] Figure 6 This is a structural schematic diagram of a power supply control circuit according to another embodiment of the present application;

[0056] Figure 7 This is a structural schematic diagram of a power supply control circuit according to another embodiment of the present application;

[0057] Figure 8 This is a structural schematic diagram of a power supply control circuit according to another embodiment of the present application;

[0058] Fig. 9 This is a structural schematic diagram of a power supply control circuit according to another embodiment of the present application;

[0059] Fig.10 This is a structural schematic diagram of a power supply control circuit according to another embodiment of the present application;

[0060] Fig.11 This is a structural schematic diagram of a power supply control circuit according to another embodiment of the present application;

[0061] Fig.12 This is a schematic diagram of a module structure of a device according to an embodiment of the present application;

[0062] Fig.13 A schematic diagram of a flow chart of a power supply control method according to an embodiment of the present application;

[0063] Fig.14 It is a flowchart of a power supply control method according to another embodiment of the present application.

[0064] In the drawings, the drawings are not necessarily drawn to scale.

[0065] In the attached figure:

[0066] 10. Power supply control circuit;

[0067] 11. A first power module;

[0068] 12. Second power supply module; 121. Energy storage control submodule; 122. Energy storage module;

[0069] 13. Switch module;

[0070] 14. Voltage detection module; 141. First voltage division submodule; 142. Second voltage division submodule; 143. Initialization submodule;

[0071] 151, a first one-way conduction module; 152, a second one-way conduction module;

[0072] 100. Device. DETAILED DESCRIPTION

[0073] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0074] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0075] The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0076] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0077] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0078] As described in the background art, when a power supply is abnormal, a power-consuming module may lose power, causing the power-consuming components to be unable to continue to work.

[0079] For example, the power supply may include a lead-acid battery, which may be connected to a power management chip (System Basic Chip, SBC), which may be connected to a microcontroller unit (Microcontroller Unit, MCU), and the lead-acid battery may supply power to the MCU through the SBC, which may be used to control the status of active fuses, airbags, etc.

[0080] However, when the vehicle collides, the lead-acid power line may be broken. In this case, the SBC\MCU loses power, and some actions that may not be executed in time are powered off before they are executed, such as the detonation of the airbag and the disconnection of the active fuse of the main circuit of the battery pack.

[0081] In addition, when performing an electromagnetic compatibility (EMC) voltage drop test, the power supply voltage may drop below the normal operating voltage of the power-consuming module, thereby causing the test to fail.

[0082] In order to solve the above technical problems, the embodiments of the present application provide a power supply control circuit, a power supply control method and a device. The power supply control circuit, the power supply control method and the device provided in the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings.

[0083] The following first introduces the power supply control circuit provided by the application embodiment.

[0084] Figure 1 FIG. 1 is a schematic diagram of a power supply control circuit according to an embodiment of the present application. Figure 1 As shown, the power supply control circuit 10 may include a first power module 11 , a second power module 12 and a switch module 13 .

[0085] The first power module 11 is connected to the power module 20. The second power module 12 is connected to the power module 20 through the switch module 13. When the voltage of the first power module 11 is greater than or equal to the threshold voltage, the switch module 13 is turned off, and the first power module 11 is used to supply power to the power module 20; when the voltage of the first power module 11 is less than the threshold voltage, the switch module 13 is turned on, and the second power module 12 is used to supply power to the power module 20.

[0086] It is understandable that the first power module 11 is the main power module, and when the voltage of the first power module 11 is greater than or equal to the threshold voltage, the first power module 11 can be used to continuously supply power to the power module 20. The second power module 12 is the backup power module, and when the voltage of the first power module 11 is less than the threshold voltage, the second power module 12 is started to supply power to the power module 20, so that when the first power module 11 is disconnected or the voltage drops, the power module 20 can continue to work.

[0087] Exemplarily, the first power module 11 may include a battery of the device, for example, the first power module 11 may include a KL30 power supply. The second power module 12 may store and release electrical energy. The threshold voltage may be set according to actual needs, for example, the threshold voltage may be 7V.

[0088] The switch module 13 can perform an on-off or off-off operation and can include switches of transistors, triodes, relays, and the like.

[0089] Exemplarily, the power consumption module 20 may include an SBC, an MCU, and the like.

[0090] According to the power supply control circuit 10 provided in the embodiment of the present application, by setting a second power supply module 12 and a switch module 13, the second power supply module 12 is connected to the power module 20 through the switch module 13. When the voltage of the first power supply module 11 is less than the threshold voltage, the second power supply module 12 can be started to supply power to the power module 20. In this way, when the first power supply module 11 is disconnected or the voltage drops, the power module 20 can be guaranteed to continue working, thereby improving the power supply reliability.

[0091] For example, when the vehicle collides and the first power module 11 is disconnected or the voltage drops, the second power module 12 supplies power to the power module 20, thereby ensuring that the power module 20 continues to work. Therefore, the main circuit active fuse can still be disconnected and the airbag can still be deployed.

[0092] In some optional embodiments, such as Figure 2 As shown, the second power module 12 can be connected to the first power module 11, and the second power module 12 can also be used to receive and store the electric energy of the first power module 11. In this way, the electric energy stored in the second power module 12 can come from the first power module 11, so there is no need to introduce an additional power source, which is conducive to simplifying the structure and reducing costs.

[0093] Illustratively, when the first power module 11 is used to power on, the second power module 12 can receive and store electrical energy from the first power module 11 to ensure that after the first power module 11 is disconnected or the voltage drops, the second power module 12 has sufficient electrical energy to meet the working requirements of the power module 20.

[0094] In some optional embodiments, such as Figure 3 As shown, the second power module 12 may include an energy storage control submodule 121 and an energy storage submodule 122, wherein the energy storage control submodule 121 is connected to the first power module 11 and the energy storage submodule 122, and the energy storage submodule 122 is connected to the switch module 13. The energy storage control submodule 121 is used to control the energy storage submodule 122 to receive and store the electric energy of the first power module 11. The energy storage submodule 122 is used to store electric energy when the switch module 13 is turned off, and to release electric energy to the power module 20 when the switch module 13 is turned on. According to the embodiment of the present application, through the control of the energy storage control submodule 121 and the storage and release of electric energy by the energy storage submodule 122, it is possible to store electric energy from the first power module 11, and to supply power to the power module 20 when the switch module 13 is turned on.

[0095] In some optional embodiments, such as Figure 4 As shown, the energy storage control submodule 121 may include an inductor L, a first switch Q1, and a first diode D1, and the energy storage submodule 122 may include a capacitor C.

[0096] The first end of the inductor L is connected to the first power module 11, the second end of the inductor L is connected to the first end of the first switch Q1 and the positive electrode of the first diode D1; the second end of the first switch Q1 is grounded, and the control end of the first switch Q1 is connected to a pulse width modulation (PWM) signal; the cathode of the first diode D1 is connected to the first electrode of the capacitor C; the first electrode of the capacitor C is connected to the switch module 13, and the second electrode of the capacitor C is grounded. The first switch Q1 may include a transistor.

[0097] The first switch Q1 can be controlled to be alternately turned on and off, so that the inductor L, the first switch Q1, the first diode D1 and the capacitor C can form a BOOST boost circuit.

[0098] The first power module 11 can be a DC power supply. The first end of the inductor L is connected to the first power module 11. The inductor L is input with DC power. When the first switch Q1 is turned on, the first switch Q1 can be equivalent to a wire. The current flows through the inductor L and the first switch Q1 and then reaches the ground. Since the input is DC power, the current on the inductor L increases linearly at a certain ratio. As the current of the inductor L increases, the inductor L stores some energy. Therefore, when the first switch Q1 is turned on, the inductor L is charged.

[0099] When the first switch Q1 is turned off, due to the current holding characteristic of the inductor L, the current on the inductor L will continue to flow in the same direction. Since the first switch tube Q1 is turned off, the current will flow through the first diode D1 to reach the first electrode of the capacitor C. The current on the inductor L will change from gradually increasing during energy storage to gradually decreasing during energy release. When the current on the inductor L changes from increasing to decreasing, the polarity of the voltage on the inductor L will be reversed, and the voltage on the inductor L will be superimposed on the voltage connected from the first power module 11, thereby completing the boost function.

[0100] Exemplarily, the duty cycle of the PWM signal can be adjusted to control the ratio between the on-time and off-time of the first switch Q1, thereby adjusting the voltage boost multiple of the first power module 11. The duty cycle of the PWM signal can be adjusted according to the voltage requirement of the power module 20. Different duty cycles of the PWM signal can also be understood as different refresh frequencies of the PWM signal.

[0101] For example, a BOOST driver chip may be used to output a PWM signal to control the first switch Q1 to be turned on or off. The present application does not limit the specific structure of the BOOST driver chip.

[0102] In some optional embodiments, such as Figure 5 As shown, the power supply control circuit 10 may also include a voltage detection module 14, which is connected to the first power supply module 11 and the switch module 13. The voltage detection module 14 is used to detect the voltage of the first power supply module 11, and when the voltage of the first power supply module 11 is greater than or equal to a threshold voltage, control the switch module 13 to be turned off, and when the voltage of the first power supply module 11 is less than the threshold voltage, control the switch module 13 to be turned on.

[0103] In the embodiment of the present application, by setting up a voltage detection module 14, the voltage of the first power module 11 can be detected, and then it can be determined whether the first power module 11 has abnormalities such as disconnection or voltage drop, so as to accurately control the state of the switch module 13.

[0104] In some optional embodiments, such as Figure 6 or Figure 7As shown, the voltage detection module 14 includes a comparator OPA, a first input end of the comparator OPA is connected to the first power module 11, a second input end of the comparator QPA is connected to the reference power supply VREF, and an output end of the comparator OPA is connected to the control end of the switch module 13. The comparator OPA can be used to: when the voltage at the first input end is less than the voltage at the second input end, control the switch module 13 to turn on, and when the voltage at the first input end is greater than or equal to the voltage at the second input end, control the switch module 13 to turn off. The comparator structure is relatively simple, so the voltage of the first power module 11 can be matched with the state of the switch module 13 in a simple and convenient manner.

[0105] It can be understood that since the first input terminal of the comparator OPA is connected to the first power supply module 11, the voltage of the first input terminal is positively correlated with the voltage of the first power supply module 11. The smaller the voltage of the first power supply module 11, the smaller the voltage of the first input terminal. Conversely, the larger the voltage of the first power supply module 11, the larger the voltage of the first input terminal.

[0106] The voltage of the reference power supply VREF is a fixed voltage.

[0107] As an example, Figure 6 As shown, the comparator OPA may be an inverting comparator. The switch module 13 may be turned on at a high level and turned off at a low level. The first input terminal may be the inverting input terminal - of the comparator OPA, and the second input terminal may be the non-inverting input terminal + of the comparator OPA. When the voltage of the first input terminal (i.e., the inverting input terminal -) is less than the voltage of the second input terminal (i.e., the non-inverting input terminal +), the comparator OPA may output a high level, thereby controlling the switch module 13 to be turned on. When the voltage of the first input terminal (i.e., the inverting input terminal -) is greater than or equal to the voltage of the second input terminal (i.e., the non-inverting input terminal +), the comparator OPA may output a low level, thereby controlling the switch module 13 to be turned off.

[0108] As another example, Figure 7 As shown, the comparator OPA may be a non-inverting comparator. The switch module 13 may be turned on at a low level and turned off at a high level. The first input terminal is the non-inverting input terminal + of the comparator OPA, and the second input terminal is the inverting input terminal - of the comparator OPA. When the voltage of the first input terminal (i.e., the non-inverting input terminal +) is less than the voltage of the second input terminal (i.e., the inverting input terminal -), the comparator OPA may output a low level, thereby controlling the switch module 13 to turn on. When the voltage of the first input terminal (i.e., the non-inverting input terminal +) is greater than or equal to the voltage of the second input terminal (i.e., the inverting input terminal -), the comparator OPA may output a high level, thereby controlling the switch module 13 to turn off.

[0109] Exemplarily, the switch module 13 may include a second switch Q2. The second switch Q2 may include a transistor. When the comparator OPA is an inverting comparator, the second switch Q2 may be an N-type transistor; when the comparator OPA is a non-inverting comparator, the second switch Q2 may be a P-type transistor.

[0110] Of course, in other examples, the second switch Q2 may also be a transistor, a relay, etc.

[0111] In some optional embodiments, such as Figure 8 As shown, the voltage detection module 14 may also include a first voltage divider module 141, a first end of the first voltage divider module 141 is connected to the first power module 11, a second end of the first voltage divider module 141 is grounded, a third end of the first voltage divider module 141 is connected to the first input end of the comparator OPA, and a voltage at the third end of the first voltage divider module 141 is between a voltage at the first end of the first voltage divider module 141 and a voltage at the second end of the first voltage divider module 141. And / or, a second voltage divider module 142, a first end of the second voltage divider module 142 is connected to the reference power supply VREF, a second end of the second voltage divider module 142 is grounded, a third end of the second voltage divider module 142 is connected to the second input end of the comparator OPA, and a voltage at the third end of the second voltage divider module 142 is between a voltage at the first end of the second voltage divider module 142 and a voltage at the second end of the second voltage divider module 142. And / or, an initialization submodule 143 , the initialization submodule 143 is connected to the output end of the comparator OPA and the control end of the switch module 13 , and the initialization submodule 143 can be used to initialize the voltage of the control end of the switch module 13 .

[0112] In the embodiment of the present application, the first voltage-dividing submodule 141 can divide the voltage of the first power module 11, and / or the second voltage-dividing submodule 142 can divide the voltage of the reference power supply VREF, so that when the voltage of the first power module 11 and / or the reference power supply VREF is large, the normal operation of the comparator OPA can be guaranteed. The initialization submodule 143 can be used to initialize the potential of the control end of the switch module 13, so as to stabilize the state of the control switch module 13 and further improve the circuit reliability.

[0113] It should be noted that Figure 8 Taking the comparator OPA as an inverting comparator as an example, this is not intended to limit the present application. Exemplarily, when the comparator OPA is an inverting comparator, the voltage of the reference power supply VREF may be 5V.

[0114] In some optional embodiments, such as Fig. 9As shown, the first voltage divider module 141 may include a first resistor R1 and a second resistor R2, the first end of the first resistor R1 is connected to the first power module 11, the second end of the first resistor R2 is connected to the first end of the second resistor R2 and the first input end of the comparator OPA, and the second end of the second resistor R2 is grounded. And / or, the second voltage divider module 142 may include a third resistor R3 and a fourth resistor R4, the first end of the third resistor R3 is connected to the reference power supply VREF, the second end of the third resistor R3 is connected to the first end of the fourth resistor R4 and the second input end of the comparator OPA, and the second end of the fourth resistor R4 is grounded. And / or, the initialization submodule 143 includes a fifth resistor R5, the first end of the fifth resistor R5 is connected to the output end of the comparator OPA, and the second end of the fifth resistor R5 is grounded.

[0115] In the embodiment of the present application, the voltage division submodule includes resistors connected in series to perform voltage division, and the initialization submodule includes a resistor connected to ground. While achieving voltage division and initialization, the structure is relatively simple.

[0116] The second end of the first resistor R2 is connected to the first end of the second resistor R2, and the third end of the first voltage divider module 141 can be any node between the second end of the first resistor R2 and the first end of the second resistor R2. The second end of the third resistor R3 is connected to the first end of the fourth resistor R4, and the third end of the second voltage divider module 142 can be any node between the second end of the third resistor R3 and the first end of the fourth resistor R4.

[0117] It is understandable that by setting the ratio of the resistance values ​​of the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4, it is possible to detect whether the voltage of the first power module 11 is less than the threshold voltage. As described above, the threshold voltage can be set according to actual needs, so the resistance values ​​of the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 can also be set according to actual needs, and this application does not limit this.

[0118] It should be noted that Fig. 9 Taking the comparator OPA as an inverting comparator as an example, this is not intended to limit the present application. Exemplarily, when the comparator OPA is an inverting comparator, the reference power supply VREF can also be used as the working power supply of the comparator OPA.

[0119] In some optional embodiments, such as Fig.10 As shown, the power supply control circuit 10 may also include a first unidirectional conduction module 151, and the first power supply module 11 is connected to the power module 20 through the first unidirectional conduction module 151; and / or, a second unidirectional conduction module 152, and the second power supply module 12 is connected to the power module 20 through the second unidirectional conduction module 152.

[0120] It is understandable that the unidirectional conduction module has a conducting characteristic, the first unidirectional conduction module 151 can make the electrical signal flow from the first power module 11 to the power module 20, and the second unidirectional conduction module 152 can make the electrical signal flow from the second power module 12 to the power module 20. The electrical signal may include a current signal.

[0121] In the embodiment of the present application, the first unidirectional conduction module 151 can be used to prevent the electrical signal of the power-consuming module 20 from flowing back to the first power supply module 11, thereby improving the stability of the first power supply module 11; the second unidirectional conduction module 152 can be used to prevent the electrical signal of the power-consuming module 20 from flowing back to the second power supply module 12, thereby improving the stability of the second power supply module 12.

[0122] It is understandable that the second unidirectional conduction module 152 is connected to the output end of the second power module 12 , so that the second unidirectional conduction module 152 can also be used to prevent the electrical signal of the first power module 11 from flowing back from the output end of the second power module 12 to the second power module 12 .

[0123] In some optional embodiments, such as Fig.11 As shown, the first unidirectional conduction module 151 may include a second diode D2, the positive pole of the second diode D2 is connected to the first power module 11, and the negative pole of the second diode D2 is connected to the power module 20; and / or, the second unidirectional conduction module 152 may include a third diode D3, the positive pole of the third diode D3 is connected to the second power module 12, and the negative pole of the third diode D3 is connected to the switch module 13.

[0124] The diode has a unidirectional conduction characteristic. The second diode D2 is used to achieve unidirectional conduction between the first power module 11 and the power module 20, and the third diode D3 is used to achieve unidirectional conduction between the second power module 12 and the power module 20. The structure is simple and the cost is low.

[0125] Based on the same inventive concept, the present application also provides a device. Fig.12 As shown, the device 100 includes a power module 20 and a power supply control circuit 10, and the power supply control circuit 10 is the power supply control circuit 10 in any of the above embodiments. It can be understood that the device has the beneficial effects of the power supply control circuit provided in the embodiment of the present application, and the specific description of the power supply control circuit in the above embodiments can be referred to, and this embodiment will not be repeated here.

[0126] It should be noted that in the embodiments shown in the above figures, the resistor is represented by a single resistor, and the capacitor is represented by a single capacitor. In other embodiments, the resistor may be an integration of series, parallel or mixed resistors, and the capacitor may be an integration of series, parallel or mixed capacitors. The specific parameters of each device can be set according to actual needs, and this application does not limit this.

[0127] Based on the same inventive concept, the present application also provides a power supply control method. Fig.13 As shown, the power supply control method may include S10.

[0128] When the voltage of the first power module is greater than or equal to the threshold voltage, the first power module is controlled to supply power to the power module; when the voltage of the first power module is less than the threshold voltage, the second power module is controlled to supply power to the power module.

[0129] In an embodiment of the present application, when the voltage of the first power module is less than the threshold voltage, the second power module can be started to supply power to the power-consuming module. In this way, when the first power module is disconnected or the voltage drops, the power-consuming module can continue to work, thereby improving the power supply reliability.

[0130] The power supply control method provided in the embodiments of the present application can be used to control the power supply control circuit in any of the above embodiments. It can be understood that the power supply control method has the beneficial effects of the power supply control circuit provided in the embodiments of the present application. For details, please refer to the specific description of the power supply control circuit in the above embodiments, and this embodiment will not be repeated here.

[0131] In some embodiments, the second power module may be connected to the power module via a switch module. S10 may include: when the voltage of the first power module is greater than or equal to the threshold voltage, controlling the switch module to turn off so as to control the first power module to supply power to the power module; when the voltage of the first power module is less than the threshold voltage, controlling the switch module to turn on so as to control the second power module to supply power to the power module.

[0132] In some embodiments, the second power module is connected to the first power module, and the method provided in the embodiment of the present application may further include: controlling the second power module to receive and store electrical energy from the first power module.

[0133] In some embodiments, the second power module includes an energy storage control submodule and an energy storage submodule, the energy storage control submodule is connected to the first power module and the energy storage submodule, and the energy storage submodule is connected to the switch module.

[0134] The step of controlling the second power module to receive and store the electric energy from the first power module may include:

[0135] The energy storage control submodule is used to control the energy storage submodule to receive and store electric energy from the first power module; and when the switch module is turned off, the energy storage submodule is controlled to store electric energy, and when the switch module is turned on, the energy storage submodule is controlled to release electric energy to the power consumption module.

[0136] The structures of the energy storage control submodule and the energy storage submodule may be as described in detail in the above embodiments for the energy storage control submodule and the energy storage submodule in the power supply control circuit, which will not be described in detail here.

[0137] In some embodiments, Fig.14 As shown, before S10, the power supply control method provided in the embodiment of the present application may further include S20.

[0138] S20, detecting the voltage of the first power module, and comparing the voltage of the first power module with a threshold voltage.

[0139] In the embodiment of the present application, by detecting the voltage of the first power module, it can be determined whether the first power module has abnormalities such as disconnection or voltage drop, so as to accurately control the power supply status of the two power supplies.

[0140] Exemplarily, the above step S20 may be performed by the voltage detection module 14 in the power supply control circuit in the above embodiment. In some embodiments, S20 may include: using a comparator to detect the voltage of the first power module, wherein the first input terminal of the comparator is connected to the first power module, and the second input terminal of the comparator is connected to the reference power supply; when the voltage of the first input terminal is less than the voltage of the second input terminal, it is determined that the voltage of the first power module is less than the threshold voltage, and when the voltage of the first input terminal is greater than or equal to the voltage of the second input terminal, it is determined that the voltage of the first power module is greater than or equal to the threshold voltage.

[0141] In some embodiments, the second power supply module is connected to the power module via a switch module, and the output end of the comparator is connected to the control end of the switch module.

[0142] In some embodiments, the first input terminal is the inverting input terminal of the comparator, and the second input terminal is the non-inverting input terminal of the comparator; or, the first input terminal is the non-inverting input terminal of the comparator, and the second input terminal is the inverting input terminal of the comparator.

[0143] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0144] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A power supply control circuit, characterized in that: It includes a first power module, a second power module and a switch module; The first power module is connected to the power module; The second power supply module is connected to the power consumption module through the switch module; When the voltage of the first power module is greater than or equal to the threshold voltage, the switch module is turned off, and the first power module is used to supply power to the power module; When the voltage of the first power module is less than a threshold voltage, the switch module is turned on, and the second power module is used to supply power to the power-consuming module.

2. The power supply control circuit according to claim 1, characterized in that: The second power module is connected to the first power module, and the second power module is further used to receive and store electrical energy from the first power module.

3. The power supply control circuit according to claim 1 or 2, characterized in that: The second power module includes an energy storage control submodule and an energy storage submodule, the energy storage control submodule is connected to the first power module and the energy storage submodule, and the energy storage submodule is connected to the switch module; The energy storage control submodule is used to control the energy storage submodule to receive and store the electric energy of the first power module; The energy storage submodule is used to store electric energy when the switch module is turned off, and to release electric energy to the power consumption module when the switch module is turned on.

4. The power supply control circuit according to claim 3, characterized in that: The energy storage control submodule includes an inductor, a first switch, and a first diode, and the energy storage submodule includes a capacitor; The first end of the inductor is connected to the first power module, and the second end of the inductor is connected to the first end of the first switch and the anode of the first diode; The second end of the first switch is grounded, and the control end of the first switch is connected to the pulse width modulation signal; The cathode of the first diode is connected to the first electrode of the capacitor; A first electrode of the capacitor is connected to the switch module, and a second electrode of the capacitor is grounded.

5. The power supply control circuit according to any one of claims 1 to 4, characterized in that: The power supply control circuit also includes a voltage detection module, which is connected to the first power supply module and the switch module. The voltage detection module is used to detect the voltage of the first power supply module, and control the switch module to be turned off when the voltage of the first power supply module is greater than or equal to a threshold voltage, and control the switch module to be turned on when the voltage of the first power supply module is less than the threshold voltage.

6. The power supply control circuit according to claim 5, characterized in that: The voltage detection module comprises a comparator, a first input end of the comparator is connected to the first power supply module, a second input end of the comparator is connected to a reference power supply, and an output end of the comparator is connected to a control end of the switch module; The comparator is used to control the switch module to turn on when the voltage at the first input terminal is less than the voltage at the second input terminal, and to control the switch module to turn off when the voltage at the first input terminal is greater than or equal to the voltage at the second input terminal.

7. The power supply control circuit according to claim 6, characterized in that: The first input terminal is the inverting input terminal of the comparator, and the second input terminal is the non-inverting input terminal of the comparator; Alternatively, the first input terminal is a non-inverting input terminal of the comparator, and the second input terminal is an inverting input terminal of the comparator.

8. The power supply control circuit according to claim 6 or 7, characterized in that: The voltage detection module also includes: A first voltage-dividing submodule, wherein a first end of the first voltage-dividing submodule is connected to the first power supply module, a second end of the first voltage-dividing submodule is grounded, a third end of the first voltage-dividing submodule is connected to the first input end, and a voltage at the third end of the first voltage-dividing submodule is between a voltage at the first end of the first voltage-dividing submodule and a voltage at the second end of the first voltage-dividing submodule.

9. The power supply control circuit according to claim 6 or 7, characterized in that: The voltage detection module also includes: a second voltage divider submodule, wherein a first end of the second voltage divider submodule is connected to the reference power supply, a second end of the second voltage divider submodule is grounded, a third end of the second voltage divider submodule is connected to the second input end, and a voltage at the third end of the second voltage divider submodule is between a voltage at the first end of the second voltage divider submodule and a voltage at the second end of the second voltage divider submodule.

10. The power supply control circuit according to claim 6 or 7, characterized in that: The voltage detection module also includes: An initialization submodule, wherein the initialization submodule is connected to the output end of the comparator and the control end of the switch module, and the initialization submodule is used to initialize the voltage of the control end of the switch module.

11. The power supply control circuit according to claim 8, characterized in that: The first voltage divider module includes a first resistor and a second resistor, the first end of the first resistor is connected to the first power module, the second end of the first resistor is connected to the first end of the second resistor and the first input end, and the second end of the second resistor is grounded.

12. The power supply control circuit according to claim 9, characterized in that: The second voltage divider module includes a third resistor and a fourth resistor, a first end of the third resistor is connected to the reference power supply, a second end of the third resistor is connected to the first end of the fourth resistor and the second input end, and a second end of the fourth resistor is grounded.

13. The power supply control circuit according to claim 10, characterized in that: The initialization submodule comprises a fifth resistor, a first end of the fifth resistor is connected to the output end of the comparator and the control end of the switch module, and a second end of the fifth resistor is grounded.

14. The power supply control circuit according to any one of claims 1 to 13, characterized in that: The power supply control circuit also includes: a first unidirectional conduction module, wherein the first power supply module is connected to the power consumption module via the first unidirectional conduction module; And / or, a second unidirectional conduction module, the second power supply module is connected to the power consumption module through the second unidirectional conduction module.

15. A device, characterized in that: include: Power consumption module; A power supply control circuit as described in any one of claims 1 to 11.

16. A power supply control method, characterized in that: include: When the voltage of the first power module is greater than or equal to the threshold voltage, controlling the first power module to supply power to the power-consuming module; When the voltage of the first power module is less than the threshold voltage, the second power module is controlled to supply power to the power-consuming module.

17. The method according to claim 16, characterized in that The method further comprises: The voltage of the first power module is detected, and the voltage of the first power module is compared with the threshold voltage.

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