Power supply control circuit, and power supply control method and device

Abstract

The present application discloses a power supply control circuit, and a power supply control method and device. The power supply control circuit comprises a first power supply module, a second power supply module, and a switch module. The first power supply module is connected to a power consumption module, and the second power supply module is connected to the power consumption module by means of the switch module. When the voltage of the first power supply module is greater than or equal to a threshold voltage, the switch module is turned off, and the first power supply module is used to supply power to the power consumption module. When the voltage of the first power supply module is less than the threshold voltage, the switch module is turned on, and the second power supply module is used to supply power to the power consumption module. Embodiments of the present application improve the reliability of power supply.

Description

Power supply control circuit, power supply control method and device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202311087290.3, filed on August 28, 2023, entitled “Power supply control circuit, power supply control method and device,” and the entire contents of that application are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of power supply control technology, and in particular to a power supply control circuit, a power supply control method and a power supply control device. Background Art

[0004] 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.

[0005] However, in the event of an abnormality in the power supply, the power-consuming module may lose power, causing the power-consuming components to cease functioning.

[0006] Summary of the Invention

[0007] 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.

[0008] In the 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 the power module; the second power module is connected to the power 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 the threshold voltage, the switch module is turned on, and the second power module is used to supply power to the power module.

[0009] In a possible implementation of the first aspect, the second power module is connected to the first power module, and the second power module is further configured to receive and store electrical energy from the first power module.

[0010] 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;

[0011] 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;

[0012] The energy storage submodule is used to store electrical energy when the switch module is turned off, and release electrical energy to the power consumption 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 the first end of the first switch and the anode of the first diode;

[0015] The second terminal of the first switch is grounded, and the control terminal 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] 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.

[0019] In one possible implementation of the first aspect, the voltage detection module includes a comparator, a first input terminal of the comparator is connected to the first power supply module, a second input terminal of the comparator is connected to a reference power supply, and an output terminal of the comparator is connected to a control terminal of the switch module;

[0020] 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.

[0021] In a possible implementation 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;

[0022] 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.

[0023] In a possible implementation of the first aspect, the voltage detection module further includes:

[0024] A first voltage divider submodule, wherein the first end of the first voltage divider submodule is connected to the first power supply module, the second end of the first voltage divider submodule is grounded, the third end of the first voltage divider submodule is connected to the first input end, and the voltage of the third end of the first voltage divider submodule is between the voltage of the first end of the first voltage divider submodule and the voltage of the second end of the first voltage divider submodule.

[0025] 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 of the third end of the second voltage divider submodule is between a voltage of the first end of the second voltage divider submodule and a voltage of the second end of the second voltage divider submodule.

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

[0027] 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.

[0028] 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 of the fourth resistor and the second input end, and the second end of the fourth resistor is grounded.

[0029] 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.

[0030] In a possible implementation of the first aspect, the power supply control circuit further includes:

[0031] a first unidirectional conduction module, wherein the first power supply module is connected to the power consumption module via the first unidirectional conduction module;

[0032] And / or, a second unidirectional conducting module, the second power supply module is connected to the power module via the second unidirectional conducting module.

[0033] In a possible implementation of the first aspect, the first unidirectional conducting 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;

[0034] 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.

[0035] Based on the same inventive concept, in a second aspect, an embodiment of the present application provides a device comprising a power-consuming module and a power supply control circuit as described in any embodiment of the first aspect.

[0036] 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 supply module is greater than or equal to a threshold voltage, controlling the first power supply module to supply power to the power-consuming module; when the voltage of the first power supply module is less than the threshold voltage, controlling the second power supply module to supply power to the power-consuming module.

[0037] In a possible implementation of the first aspect, the method further includes:

[0038] The voltage of the first power module is detected, and the voltage of the first power module is compared with a threshold voltage.

[0039] In an embodiment of the present application, a second power supply module and a switch module are set up, 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 lower than the 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.

[0040] 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 in accordance with the contents of the specification. 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 listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0042] FIG1 is a schematic structural diagram of a power supply control circuit according to an embodiment of the present application;

[0043] FIG2 is a schematic structural diagram of a power supply control circuit according to another embodiment of the present application;

[0044] FIG3 is a schematic structural diagram of a power supply control circuit according to another embodiment of the present application;

[0045] FIG4 is a schematic structural diagram of a power supply control circuit according to another embodiment of the present application;

[0046] FIG5 is a schematic structural diagram of a power supply control circuit according to another embodiment of the present application;

[0047] FIG6 is a schematic structural diagram of a power supply control circuit according to another embodiment of the present application;

[0048] FIG7 is a schematic structural diagram of a power supply control circuit according to another embodiment of the present application;

[0049] FIG8 is a schematic structural diagram of a power supply control circuit according to another embodiment of the present application;

[0050] FIG9 is a schematic structural diagram of a power supply control circuit according to another embodiment of the present application;

[0051] FIG10 is a schematic structural diagram of a power supply control circuit according to another embodiment of the present application;

[0052] FIG11 is a schematic structural diagram of a power supply control circuit according to another embodiment of the present application;

[0053] FIG12 is a schematic diagram of a module structure of a device according to an embodiment of the present application;

[0054] FIG13 is a schematic flow chart of a power supply control method according to an embodiment of the present application;

[0055] FIG14 is a flow chart of a power supply control method according to another embodiment of the present application.

[0056] In the accompanying drawings, the drawings are not necessarily drawn to scale.

[0057] In the accompanying drawings: 10. Power supply control circuit; 11. First power supply module; 12. Second power supply module; 121. Energy storage control submodule; 122. Energy storage module; 13. Switch module; 14. Voltage detection module; 141. First voltage divider submodule; 142. Second voltage divider submodule; 143. Initialization submodule; 151. First unidirectional conduction module; 152. Second unidirectional conduction module; 100. Device. DETAILED DESCRIPTION

[0058] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0059] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as 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.

[0060] The terms "first", "second" and the like 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-secondary relationship.

[0061] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0062] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0063] As described in the background art, when a power supply anomaly occurs, the power-consuming module may lose power, causing the power-consuming components to cease functioning.

[0064] 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 (MCU), and the lead-acid battery may supply power to the MCU through the SBC. The MCU may be used to control the status of active fuses, airbags, etc.

[0065] However, in the event of a vehicle collision, the lead-acid power cable may be severed. In this case, the SBC / MCU loses power, and some actions that may not have time to be executed are cut off before the power is cut off, such as airbag deployment and disconnection of the active fuse in the battery pack's main circuit.

[0066] In addition, during 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.

[0067] 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 introduced in detail below in conjunction with the accompanying drawings.

[0068] The following first introduces the power supply control circuit provided by the application embodiment.

[0069] FIG1 is a schematic diagram of a power supply control circuit according to an embodiment of the present application. As shown in FIG1 , the power supply control circuit 10 may include a first power supply module 11 , a second power supply module 12 , and a switch module 13 .

[0070] The first power module 11 is connected to the power module 20. The second power module 12 is connected to the power module 20 via 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.

[0071] It is understood that the first power module 11 is the main power module. 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-consuming module 20. The second power module 12 is the backup power module. When the voltage of the first power module 11 is less than the threshold voltage, the second power module 12 is activated to supply power to the power-consuming module 20. In this way, even if the first power module 11 is disconnected or the voltage drops, the power-consuming module 20 can continue to operate.

[0072] For example, the first power module 11 may include a battery for the device, for example, 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, 7V.

[0073] The switch module 13 can perform an on / off operation and can include switches such as transistors, triodes, and relays.

[0074] Exemplarily, the power consumption module 20 may include an SBC, an MCU, and the like.

[0075] 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-consuming 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-consuming module 20. In this way, when the first power supply module 11 is disconnected or the voltage drops, the power-consuming module 20 can continue to work, thereby improving the power supply reliability.

[0076] For example, when the vehicle collides, if the first power module 11 is disconnected or the voltage drops, the second power module 12 supplies power to the power module 20, ensuring that the power module 20 continues to work, so the main circuit active fuse can still be disconnected and the airbag can be deployed.

[0077] In some optional embodiments, as shown in FIG2 , 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 electrical energy from the first power module 11. In this way, the electrical energy stored in the second power module 12 can come from the first power module 11, eliminating the need for an additional power source, thereby simplifying the structure and reducing costs.

[0078] For example, 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 can have sufficient electrical energy to meet the working requirements of the power module 20.

[0079] In some optional embodiments, as shown in FIG3 , the second power module 12 may include an energy storage control submodule 121 and an energy storage submodule 122. 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 configured to control the energy storage submodule 122 to receive and store electrical energy from the first power module 11. The energy storage submodule 122 is configured to store electrical energy when the switch module 13 is off and release electrical energy to the power-consuming module 20 when the switch module 13 is on. According to embodiments of the present application, through the control of the energy storage control submodule 121 and the storage and release of electrical energy by the energy storage submodule 122, electrical energy from the first power module 11 can be stored and supplied to the power-consuming module 20 when the switch module 13 is on.

[0080] In some optional embodiments, as shown in FIG. 4 , 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.

[0081] The first end of the inductor L is connected to the first power module 11, and the second end of the inductor L is connected to the first end of the first switch Q1 and the anode of the first diode D1. The second end of the first switch Q1 is grounded, and the control end of the first switch Q1 receives 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.

[0082] 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 circuit.

[0083] 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. DC power is input to the inductor L. When the first switch Q1 is on, the first switch Q1 can be compared to a wire, with current flowing through the inductor L, the first switch Q1, and then to ground. Because the input is DC power, the current in the inductor L increases linearly at a certain rate. As the current in the inductor L increases, some energy is stored in the inductor L. Therefore, when the first switch Q1 is on, the inductor L is charged.

[0084] When the first switch Q1 is turned off, due to the current retention characteristics of the inductor L, the current in the inductor L will continue to flow in the same direction. Since the first switch Q1 is turned off, the current will flow through the first diode D1 and reach the first electrode of the capacitor C. The current in the inductor L will gradually increase during energy storage and gradually decrease during energy release. When the current in the inductor L changes from increasing to decreasing, the polarity of the voltage on the inductor L will reverse, and the voltage on the inductor L will be superimposed on the voltage input from the first power module 11, thereby completing the boost function.

[0085] For example, the PWM signal duty cycle can be adjusted to control the ratio between the on-time and off-time of the first switch Q1, thereby adjusting the voltage boost applied to the first power module 11. The PWM signal duty cycle can be adjusted based on the voltage requirements of the power module 20. Different PWM signal duty cycles can also be understood as different PWM signal refresh frequencies.

[0086] 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.

[0087] In some optional embodiments, as shown in Figure 5, the power supply control circuit 10 may further 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 the 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.

[0088] 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.

[0089] In some optional embodiments, as shown in FIG6 or FIG7 , the voltage detection module 14 includes a comparator OPA, a first input of the comparator OPA connected to the first power module 11, a second input of the comparator QPA connected to the reference power supply VREF, and an output of the comparator OPA connected to the control terminal of the switch module 13. The comparator OPA can be used to control the switch module 13 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 13 to turn off when the voltage at the first input terminal is greater than or equal to the voltage at the second input terminal. The comparator structure is relatively simple, thus easily and conveniently matching the voltage of the first power module 11 with the state of the switch module 13.

[0090] 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 greater the voltage of the first power supply module 11, the greater the voltage of the first input terminal.

[0091] The voltage of the reference power supply VREF is a fixed voltage.

[0092] As an example, as shown in FIG6 , 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.

[0093] As another example, as shown in FIG7 , 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 be turned 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 be turned off.

[0094] 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.

[0095] Of course, in other examples, the second switch Q2 may also be a transistor, a relay, etc.

[0096] In some optional embodiments, as shown in FIG8 , the voltage detection module 14 may further include a first voltage divider submodule 141, wherein a first end of the first voltage divider submodule 141 is connected to the first power module 11, a second end of the first voltage divider submodule 141 is grounded, a third end of the first voltage divider submodule 141 is connected to the first input end of the comparator OPA, and a voltage at the third end of the first voltage divider submodule 141 is between the voltage at the first end of the first voltage divider submodule 141 and the voltage at the second end of the first voltage divider submodule 141. And / or, a second voltage divider submodule 142, wherein a first end of the second voltage divider submodule 142 is connected to the reference power supply VREF, a second end of the second voltage divider submodule 142 is grounded, a third end of the second voltage divider submodule 142 is connected to the second input end of the comparator OPA, and a voltage at the third end of the second voltage divider submodule 142 is between the voltage at the first end of the second voltage divider submodule 142 and the voltage at the second end of the second voltage divider submodule 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 .

[0097] In the embodiment of the present application, the first voltage divider submodule 141 can divide the voltage of the first power module 11, and / or the second voltage divider submodule 142 can divide the voltage of the reference power supply VREF. This ensures the normal operation of the comparator OPA when the voltage of the first power module 11 and / or the reference power supply VREF is relatively high. The initialization submodule 143 can be used to initialize the potential of the control terminal of the switch module 13, thereby stabilizing the state of the control switch module 13 and further improving circuit reliability.

[0098] It should be noted that FIG8 takes the comparator OPA as an inverting comparator as an example, which 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.

[0099] In some optional embodiments, as shown in FIG9 , the first voltage divider submodule 141 may include a first resistor R1 and a second resistor R2, wherein 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. Alternatively, the second voltage divider submodule 142 may include a third resistor R3 and a fourth resistor R4, wherein 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. Alternatively, the initialization submodule 143 may include a fifth resistor R5, wherein 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.

[0100] In the embodiment of the present application, the voltage divider submodule includes resistors connected in series to perform voltage division, and the initialization submodule includes a grounded resistor. While achieving voltage division and initialization, the structure is relatively simple.

[0101] The second end of the first resistor R2 is connected to the first end of the second resistor R2. The third end of the first voltage divider submodule 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. The third end of the second voltage divider submodule 142 can be any node between the second end of the third resistor R3 and the first end of the fourth resistor R4.

[0102] It is understood that by setting the resistance ratio 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. Therefore, 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.

[0103] It should be noted that FIG9 also takes the comparator OPA as an inverting comparator as an example, which is not intended to limit the present application. For example, when the comparator OPA is an inverting comparator, the reference power supply VREF can also serve as the operating power supply of the comparator OPA.

[0104] In some optional embodiments, as shown in Figure 10, 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.

[0105] It is understood that the unidirectional conduction module has a directional conduction characteristic. The first unidirectional conduction module 151 can allow electrical signals to flow from the first power module 11 to the power module 20, and the second unidirectional conduction module 152 can allow electrical signals to flow from the second power module 12 to the power module 20. The electrical signals may include current signals.

[0106] In an 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 module 11, thereby improving the stability of the first power 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 module 12, thereby improving the stability of the second power module 12.

[0107] 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 to the second power module 12 from the output end of the second power module 12.

[0108] In some optional embodiments, as shown in Figure 11, 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.

[0109] 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.

[0110] Based on the same inventive concept, the present application also provides a device. As shown in Figure 12, the device 100 includes a power module 20 and a power supply control circuit 10. The power supply control circuit 10 is the power supply control circuit 10 in any of the above embodiments. It is understood that the device has the beneficial effects of the power supply control circuit provided in the embodiments of the present application. For details, please refer to the detailed description of the power supply control circuit in the above embodiments, and this embodiment will not be repeated here.

[0111] It should be noted that in the embodiments shown in the above figures, the resistor is represented as a single resistor, and the capacitor is represented as a single capacitor. In other embodiments, the resistor may be an integration of resistors connected in series, in parallel, or in a hybrid configuration, and the capacitor may be an integration of capacitors connected in series, in parallel, or in a hybrid configuration. The specific parameters of each device may be set according to actual needs, and this application does not limit this.

[0112] Based on the same inventive concept, the present application also provides a power supply control method. As shown in FIG13 , the power supply control method may include S10.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] In some embodiments, the second power module may be connected to the power-consuming module via a switch module. S10 may include: when the voltage of the first power module is greater than or equal to a threshold voltage, controlling the switch module to be turned off to control the first power module to supply power to the power-consuming module; and when the voltage of the first power module is less than the threshold voltage, controlling the switch module to be turned on to control the second power module to supply power to the power-consuming module.

[0117] 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.

[0118] 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.

[0119] The step of controlling the second power module to receive and store the electric energy from the first power module may include:

[0120] The energy storage control submodule is used to control the energy storage submodule to receive and store electrical energy from the first power supply module; and when the switch module is turned off, the energy storage submodule is controlled to store electrical energy, and when the switch module is turned on, the energy storage submodule is controlled to release electrical energy to the power consumption module.

[0121] The structures of the energy storage control submodule and the energy storage submodule may be as described in detail in the above embodiment for the energy storage control submodule and the energy storage submodule in the power supply control circuit, and will not be repeated here.

[0122] In some embodiments, as shown in FIG14 , before S10 , the power supply control method provided in the embodiment of the present application may further include S20 .

[0123] S20: Detect the voltage of the first power module, and compare the voltage of the first power module with a threshold voltage.

[0124] 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 an abnormality such as a disconnection or voltage drop, so as to accurately control the power supply status of the two power supplies.

[0125] For example, the above step S20 can be performed for the voltage detection module 14 in the power supply control circuit in the above embodiment. In some embodiments, S20 may include: detecting the voltage of the first power module using a comparator, wherein a first input terminal of the comparator is connected to the first power module, and a second input terminal of the comparator is connected to a reference power supply; when the voltage at the first input terminal is less than the voltage at the second input terminal, determining that the voltage of the first power module is less than a threshold voltage; and when the voltage at the first input terminal is greater than or equal to the voltage at the second input terminal, determining that the voltage of the first power module is greater than or equal to the threshold voltage.

[0126] 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.

[0127] 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.

[0128] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0129] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions within the scope of the claims.

Claims

1. A power supply control circuit, comprising a first power supply module, a second power supply 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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. An apparatus comprising: Power consumption module; A power supply control circuit as claimed in any one of claims 1 to 11.

16. A power supply control method, comprising: 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, wherein: 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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