Electronic device
By introducing signal detection and control modules into electronic devices, the power supply operating mode can be quickly switched, solving the problem of device abnormalities caused by overcurrent protection in low-power mode of LDO, and improving the stability and responsiveness of the device.
Patent Information
- Application Number
- CN202511684498.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-17
- Publication Date
- 2026-02-13
AI Technical Summary
In low-power mode, low-dropout linear regulators (LDOs) have a smaller load capacity and slower response time. They are prone to triggering overcurrent protection when the load suddenly demands high current, which can cause a sudden drop in output voltage, leading to equipment abnormalities such as crashes or restarts, and affecting equipment stability.
The load signal is detected by the signal detection module, and the control module quickly switches the power supply operating mode from low power mode to normal power mode to avoid false triggering of overcurrent protection. This is achieved through methods such as current sampling, voltage detection, and clock cycle detection to ensure timely response to load changes.
It effectively avoids equipment malfunctions caused by false triggering of overcurrent protection, and improves the working stability and response speed of electronic devices in low-power mode.
Smart Images
Figure CN121523482A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of electronics, and particularly relates to an electronic device. BACKGROUND
[0002] A low dropout regulator (LDO) is a kind of power management chip, which can still output a fixed voltage stably in the case of a very small voltage difference between an input voltage and an output voltage, and is widely used in devices requiring accurate voltage control, such as mobile phones, notebook computers and the like.
[0003] In the power management system of a device, the working mode of an LDO is usually divided into a low power mode (LPM) and a normal power mode (NPM). In the sleep or low power state of the device, the LDO usually enters the LPM mode to reduce power consumption. However, due to the small load capacity and slow response time in the LPM mode, the high current demand of a load burst may quickly trigger the overcurrent protection of the LPM mode, causing the output voltage of the LDO to drop suddenly, thereby causing device abnormalities such as freezing or restarting, and affecting the stability of the device. SUMMARY
[0004] The purpose of the embodiments of the application is to provide an electronic device, which can at least solve the problem of overcurrent protection false alarm of a power supply in an LPM mode.
[0005] In a first aspect, the embodiments of the application provide an electronic device, comprising a power supply control circuit and a load, the power supply control circuit being configured to control a power supply to be in a low power mode LPM, the LPM being a working mode in which the output power of the power supply is less than or equal to a power threshold, and the load being connected to an output end of the power supply, the power supply control circuit comprising: a signal detection module configured to output a control signal to the control module according to a load signal; and a control module configured to switch the working mode of the power supply from the LPM to a normal power mode NPM according to the control signal, the NPM being a working mode in which the output power of the power supply is greater than the power threshold.
[0006] In a second aspect, the embodiments of the application provide a mode switching method, applied to the electronic device of the first aspect, the method comprising: a signal detection module outputting a control signal to a control module according to a load signal; and the control module switching the working mode of the power supply from a low power mode LPM to a normal power mode NPM according to the control signal, wherein the LPM is a working mode in which the output power of the power supply is less than or equal to a power threshold, and the NPM is a working mode in which the output power of the power supply is greater than the power threshold.
[0007] In a third aspect, an embodiment of the present application provides a readable storage medium, the readable storage medium storing a program or instructions, the program or instructions being executed by a processor to implement the steps of the method in the second aspect.
[0008] In a fourth aspect, an embodiment of the present application provides a chip, the chip comprising a processor and a communication interface, the communication interface being coupled to the processor, the processor being configured to run a program or instructions to implement the method in the second aspect.
[0009] In a fifth aspect, an embodiment of the present application provides a computer program product, the program product being stored in a storage medium, the program product being executed by at least one processor to implement the method in the second aspect.
[0010] In an embodiment of the present application, an electronic device comprises a power supply control circuit and a load, the power supply control circuit being configured to control the power supply to be in a low power mode LPM, the load being connected to an output terminal of the power supply, the power supply control circuit comprising: a signal detection module, configured to output a control signal to a control module according to a load signal; and the control module, configured to switch the working mode of the power supply from the LPM to a normal power mode NPM according to the control signal. In this way, the working mode of the power supply can be quickly switched from the LPM to the NPM according to the load signal, thereby avoiding device abnormalities caused by false triggering of the overcurrent protection in the LPM, and improving the stability of the electronic device. BRIEF DESCRIPTION OF DRAWINGS
[0011] Figure 1 FIG. 1 is a structural schematic diagram of an electronic device provided by some embodiments of the present application; Figure 2 FIG. 2 is a structural schematic diagram of an electronic device provided by some other embodiments of the present application; Figure 3 FIG. 3 is a structural schematic diagram of an electronic device provided by some other embodiments of the present application; Figure 4 FIG. 4 is a structural schematic diagram of an electronic device provided by some other embodiments of the present application; Figure 5 FIG. 5 is a structural schematic diagram of a voltage detection module provided by some embodiments of the present application; Figure 6 FIG. 6 is a structural schematic diagram of an electronic device provided by some other embodiments of the present application. DETAILED DESCRIPTION
[0012] The embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, for the purpose of explanation, and are not to be understood as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work under the premise that the scope of protection of the present application.
[0013] The terms "first", "second", and the like in the description and claims of the present application are used to distinguish similar objects, and are not used to describe a particular order or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than that illustrated or described here, and the objects distinguished by "first", "second", etc. are generally a class, not limited to the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in a "or" relationship.
[0014] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0015] The electronic device provided by the embodiments of the present application will be described in detail below by combining the drawings with specific embodiments and their application scenarios.
[0016] Please refer to Figure 1 , Figure 1 is a structural schematic diagram of an electronic device provided by some embodiments of the present application. As shown in the figure, the electronic device includes a power control circuit 110 and a load 120, the power control circuit 110 is used to control the power supply to be in a low power mode LPM, the LPM is a working mode in which the output power of the power supply is less than or equal to a power threshold, the load 120 is connected with the output end of the power supply, and the power control circuit 110 includes: a signal detection module 111, configured to output a control signal to a control module 112 according to a load signal; the control module 112, configured to switch the working mode of the power supply from the LPM to a normal power mode NPM according to the control signal, the NPM is a working mode in which the output power of the power supply is greater than the power threshold.
[0017] In an example embodiment, the power supply described above is a power supply system with adjustable power consumption mode, which can switch between LPM and NPM according to the needs of the load 120. The power supply can adopt different types, such as switching power supply, linear power supply, LDO, etc. In a specific application, the mode switching of LPM and NPM is controlled by software. When the electronic device is in a non-sleep state, the power supply works in NPM mode, and its output power is greater than the preset power threshold to ensure that the load can work normally. When the electronic device is in a sleep state, since part of the load in the electronic device does not work, the power supply works in LPM mode, and its output power is less than or equal to the power threshold to reduce power consumption.
[0018] Compared with NPM, LPM mode has smaller load capacity and slower response time. Therefore, when the current of the load 120 instantaneously increases and exceeds the over current protection (OCP) threshold of LPM, OCP is easily triggered, causing the LDO output voltage to drop, thereby causing the terminal device to enter an abnormal state, such as a crash or restart. In order to avoid this situation, the power supply control circuit 110 in the embodiment of the present application includes a signal detection module 111 and a control module 112. The signal detection module 111 outputs a control signal to the control module 111 according to the load signal, which can be a voltage or current signal of the load 120, or a wake-up signal for indicating that the load 120 switches to a working state. The control module 112 switches the working mode of the power supply from LPM to NPM according to the control signal output by the signal detection module 111.
[0019] According to the electronic device provided in the embodiment of the present application, the working mode of the power supply can be quickly switched from low power consumption mode to normal power consumption mode according to the load signal, thereby avoiding device abnormalities caused by false triggering of over current protection in LPM mode, and improving the stability of the electronic device.
[0020] In some embodiments of the present application, the load signal described above includes a load current, such as Figure 2 As shown in the figure, the signal detection module 111 includes a current sampling module 1111a and a current detection module 1111b. The load 120 is connected to the output end of the power supply through the current sampling module 1111a, and the current sampling module 1111a is used to obtain the load current. The current detection module 1111b is connected to the current sampling module 1111a, and outputs a control signal when the current value of the load current is less than a first threshold.
[0021] In an example embodiment, the power supply is taken as an example of the LDO, in the LPM mode, the LDO is used to stabilize the input voltage Vin at a lower output voltage Vout, and the output voltage Vout is sent to the load 120; the current sampling module 1111a is connected in series between the output end of the LDO and the load 120, and is used to obtain the load current. In a specific application, the current sampling module 1111a can be a sampling resistor, or a current sensor, a shunt current sensor, a Hall effect sensor, etc.
[0022] When the working mode of the electronic device is switched from the sleep state to the working state, the load in the electronic device suddenly draws current from the power supply, that is, the load draws the load, and the current of the load increases continuously. When the current value of the load current increases to a first threshold value, the current detection module 1111b outputs a control signal. The first threshold value can be adjusted according to actual needs to adapt to different working environments. In a specific application, the first threshold value is less than the OCP threshold value of the LDO. The control module 112 switches the working mode of the LDO from the LPM to the NPM according to the control signal.
[0023] According to the electronic device provided in the embodiments of the present application, by continuously detecting the load current, the working mode of the power supply can be switched from the LPM to the NPM in time before the current value of the load current reaches the overcurrent protection threshold value, thereby avoiding the influence of the inability to respond to the load transient change in time on the stability of the electronic device, and effectively protecting the device from being damaged.
[0024] In the embodiments of the present application, as some possible implementation manners, the load signal includes the load current, as shown in Figure 3 As shown in the figure, the signal detection module 111 includes the current sampling module 1111a, the current detection module 1111b and the clock circuit 1111c; the load 120 is connected to the output end of the power supply through the current sampling module 1111a, and the current sampling module 1111a is used to obtain the load current; The clock circuit 1111c is used to provide a clock period to the current detection module 1111b; The current detection module outputs a control signal to the control module according to the case that the change amount of the current value of the load 120 in the clock period is greater than the preset current change threshold value.
[0025] In an example embodiment, the clock circuit 1111c provides a clock period to the current detection module 1111b, and the current detection module 1111b calculates the variation of the current value of the load 120 in the clock period according to the load current collected by the current sampling module 1111a in the clock period, and outputs a control signal to the control module 112 when the variation is greater than a preset current variation threshold.
[0026] In this way, the clock circuit provides a clock period to the current detection module, and the current detection module can calculate the variation of the current value of the load in real time, which can reflect the sudden change or fluctuation of the load current, and can timely find abnormal current change, so as to switch the LPM of the power supply to the NPM according to the current variation rate in advance before the current reaches the overcurrent protection threshold, effectively avoiding the problem of overcurrent protection false triggering in the LPM mode.
[0027] In the embodiments of the present application, as some possible implementations, the current sampling module 1111a described above includes a sampling resistor connected in series between the load 120 and the output end of the power supply.
[0028] In this way, by arranging the sampling resistor between the load and the output end of the power supply, the cost can be reduced, the circuit layout space can be saved, and accurate current data can be obtained, and the response speed of the power supply mode switching can be improved.
[0029] In some embodiments of the present application, as shown in Figure 4 The signal detection module 111 includes a voltage detection module 1112a. The voltage detection module 1112a is connected to the output end of the power supply, and is configured to obtain the output voltage of the power supply, and output a control signal when the output voltage is lower than a second threshold.
[0030] In an example embodiment, the above power supply is taken as an example of the LDO, in the LPM mode, the LDO is configured to stabilize the input voltage Vin at a lower output voltage Vout, and send the output voltage Vout to the load 120; the voltage detection module 1112a is connected to the output end of the power supply, and is configured to obtain the output voltage of the power supply, and output a control signal when the output voltage is lower than a second threshold; and the control module 112 switches the working mode of the LDO from the LPM to the NPM according to the control signal.
[0031] In the process of instant load switching, the output voltage Vout of the power supply will instantaneously drop, and after the output voltage drops to a certain threshold, it cannot support the normal work of the back-end load. The output control signal is outputted by the voltage detection module 1112a in the case that the output voltage is lower than the second threshold, so as to avoid the influence of the failure to respond to the load transient change on the stability of the electronic equipment work, and effectively protect the equipment from damage.
[0032] In the embodiments of the present application, as some possible implementation manners, as shown in Figure 5 The voltage detection module 1112a includes an operational amplifier, a first resistor R1, a second resistor R2 and a third resistor R3; the output end of the power supply is connected with the non-inverting input end of the operational amplifier; the output end of the power supply is also connected with the first end of the first resistor R1, the second end of the first resistor R1 is connected with the third end of the second resistor R2, and the fourth end of the second resistor R2 is grounded; the second end of the first resistor R1 is also connected with the inverting input end of the operational amplifier, and the output end of the operational amplifier is connected with the control module 112; the output end of the operational amplifier is also connected with the first end of the first resistor R1 through the third resistor R3.
[0033] In an exemplary embodiment, when the power supply works in the LPM mode, the output current capability of the power supply is weak, and the output voltage is maintained at Vout, the non-inverting input voltage Vi of the operational amplifier = Vout > Vref, and the output is high. When the load changes and the output current capability of the power supply cannot meet the work demand of the load, OCP will be triggered, the output voltage of the power supply is continuously lowered (i.e. continuously dropped) by the load, and when it drops to less than the threshold Vref, Vi < Vref, the operational amplifier outputs low level, which is taken as the load transient change signal to trigger the control module 112 to switch the working mode of the power supply from LPM to NPM.
[0034] In some embodiments of the present application, the load signal described above includes a wake-up signal for indicating that the load is switched to the working state; the signal detection module 111 is connected with the control module, and the signal detection module 111 outputs the control signal in the case that the wake-up signal is received.
[0035] In an exemplary embodiment, when the electronic equipment receives the wake-up signal, the target function module will be switched from the standby or low-power state to the working state. In order to avoid the problem of false alarm of over-current protection of the power supply in the LPM mode, the signal detection module 111 can output the control signal in the case that the wake-up signal is received. As Figure 6As shown, the control signal output by the signal detection module 111 can be transmitted to the control module 112 as an interrupt signal, so that the control module 112 switches the working mode of the LDO from the LPM to the NPM according to the control signal, and then controls the target function module to switch from the standby or low-power state to the working state to start executing the predetermined task.
[0036] According to the electronic device provided in the embodiments of the present application, when the wake-up signal for the target function module in the electronic device is received, the working mode of the power supply is switched from the LPM to the NPM, which can reduce the cost and the circuit layout area, and can avoid affecting the stability of the electronic device due to the inability to respond to the load transient change in time, effectively protecting the device from damage.
[0037] In specific applications, the control module 112 described above can be a microcontroller, a central processing unit (CPU), etc. The electronic device described above can include a mobile phone, a tablet, a smart watch, a wearable device, and other types of electronic products.
[0038] In some embodiments of the present application, the signal detection module 111 outputs the control signal to the control module according to the load signal, including: In the case where the load signal indicates that the load is in the working state, the signal detection module 111 outputs the control signal to the control module.
[0039] In the embodiments of the present application, as some possible implementation manners, the load signal indicating that the load is in the working state at least includes one of the following: The load signal includes a load current, and the load current is less than a first threshold value; The load signal includes an output voltage of the power supply, and the output voltage is less than a second threshold value; The load signal includes a wake-up signal for indicating that the load switches to the working state; The load signal indicates that the amount of change of the electrical signal of the load within a preset time period exceeds a preset threshold value.
[0040] The load signal indicating that the amount of change of the electrical signal of the load within a preset time period exceeds a preset threshold value at least includes one of the following: The load signal includes a load current, and the amount of change of the current within a preset time period is greater than a preset current change threshold value; The load signal includes an output voltage of the power supply, and the amount of change of the voltage within a preset time period is greater than a preset voltage change threshold value; The load signal includes a wake-up signal for indicating that the load switches to the working state, and the amount of change of the voltage or the amount of change of the current within a preset time period is greater than a preset trigger threshold value.
[0041] The embodiment of the present application further provides a mode switching method applied to the electronic device, and the method comprises the following steps: a signal detection module outputs a control signal to a control module according to a load signal; and the control module switches a working mode of a power supply from a low power mode LPM to a normal power mode NPM according to the control signal, wherein the LPM is a working mode in which the output power of the power supply is less than or equal to a power threshold, and the NPM is a working mode in which the output power of the power supply is greater than the power threshold.
[0042] According to the mode switching method provided by the embodiment of the present application, the working mode of the power supply can be quickly switched from the low power mode to the normal power mode according to the load signal, so that the device abnormality caused by the false triggering of the overcurrent protection in the LPM mode is avoided, and the stability of the electronic device is improved.
[0043] The embodiment of the present application further provides a readable storage medium, and the readable storage medium stores a program or instructions, the program or instructions are executed by a processor to realize various processes of the above method embodiments, and the same technical effects can be achieved. To avoid repetition, details are not described herein.
[0044] The embodiment of the present application further provides a chip, and the chip comprises a processor and a communication interface, the communication interface is coupled with the processor, and the processor is used to run a program or instructions to realize various processes of the above method embodiments and achieve the same technical effects. To avoid repetition, details are not described herein.
[0045] It should be understood that the chip mentioned in the embodiment of the present application can also be referred to as a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.
[0046] The embodiment of the present application provides a computer program product, which is stored in a storage medium, and the program product is executed by at least one processor to realize various processes of the above method embodiments and achieve the same technical effects. To avoid repetition, details are not described herein.
[0047] It should be noted that, in the present document, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element. Furthermore, it is to be understood that the method and apparatus of the present application can be carried out by more than one process, method, article, or apparatus either simultaneously, concurrently, or with intervening action that are carried out at the same time, either in a simultaneous fashion or in a fashion that is interleaved in time. For example, the described methods can be performed in a different order from that described, and / or various steps can be combined or omitted, and / or additional steps can be added, without departing from the scope of the present application. Also, features described with respect to certain examples can be combined in other examples.
[0048] From the above description of the embodiments, it is apparent that the above-described method of the embodiments can be realized by means of software and general-purpose hardware platforms, and of course, can also be realized by hardware, but in many cases, the former is a better embodiment. Based on such an understanding, the technical solutions of the present application can be embodied in the form of a computer software product, which is stored in a storage medium (such as a ROM / RAM, a magnetic disk, or an optical disk), and includes a plurality of instructions for causing a terminal (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the method described in each embodiment of the present application.
[0049] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-described specific embodiments, and the above-described specific embodiments are merely illustrative, rather than limiting, and those of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the scope protected by the claims, which all belong to the protection of the present application.
Claims
1. An electronic device, characterized in that, The system includes a power control circuit and a load. The power control circuit controls the power supply to operate in a low-power mode (LPM), where the output power of the power supply is less than or equal to a power threshold. The load is connected to the output terminal of the power supply. The power control circuit includes: The signal detection module is used to output control signals to the control module based on the load signal; The control module is used to switch the operating mode of the power supply from LPM to normal power consumption mode NPM according to the control signal, wherein NPM is the operating mode in which the output power of the power supply is greater than the power threshold.
2. The electronic device according to claim 1, characterized in that, The load signal includes the load current, and the signal detection module includes a current sampling module and a current detection module; The load is connected to the output terminal of the power supply through the current sampling module, and the current sampling module is used to obtain the load current; The current detection module is connected to the current sampling module. When the load current value is less than the first threshold, the current detection module outputs the control signal.
3. The electronic device according to claim 1, characterized in that, The load signal includes the load current, and the signal detection module includes a current sampling module, a current detection module, and a clock circuit; the load is connected to the output terminal of the power supply through the current sampling module, and the current sampling module is used to acquire the load current; The clock circuit is used to provide a clock cycle to the current detection module; If the current detection module determines that the change in the load current value within the clock cycle is greater than a preset current change threshold, the current detection module outputs the control signal to the control module.
4. The electronic device according to claim 2 or 3, characterized in that, The current sampling module includes a sampling resistor connected in series between the load and the output terminal of the power supply.
5. The electronic device according to claim 1, characterized in that, The load signal includes the output voltage of the power supply, and the signal detection module includes a voltage detection module; The voltage detection module is connected to the output terminal of the power supply and is used to obtain the output voltage of the power supply. When the output voltage is lower than the second threshold, the voltage detection module outputs the control signal.
6. The electronic device according to claim 5, characterized in that, The voltage detection module includes an operational amplifier, a first resistor, a second resistor, and a third resistor; The output terminal of the power supply is connected to the non-inverting input terminal of the operational amplifier; The output terminal of the power supply is also connected to the first terminal of the first resistor, the second terminal of the first resistor is connected to the third terminal of the second resistor, and the fourth terminal of the second resistor is grounded. The second end of the first resistor is also connected to the inverting input of the operational amplifier, and the output of the operational amplifier is connected to the control module. The output terminal of the operational amplifier is also connected to the first terminal of the first resistor through the third resistor.
7. The electronic device according to claim 1, characterized in that, The load signal includes a wake-up signal indicating that the load has switched to a working state; The signal detection module is connected to the control module, and when the signal detection module receives the wake-up signal, it outputs the control signal.
8. The electronic device according to claim 1, characterized in that, The signal detection module outputs a control signal to the control module based on the load signal, including: When the load signal indicates that the load is in a working state, the signal detection module outputs the control signal to the control module.
9. The electronic device according to claim 8, characterized in that, The load signal indicates that the load is in a working state, and includes at least one of the following: The load signal includes the load current, and the load current is less than a first threshold. The load signal includes the output voltage of the power supply, and the output voltage is less than a second threshold. The load signal includes a wake-up signal indicating that the load has switched to a working state; The load signal indicates that the change in the electrical signal of the load exceeds a preset threshold within a preset time period.
10. The electronic device according to claim 9, characterized in that, The load signal indicates that the change in the electrical signal of the load exceeds a preset threshold within a preset time period, and includes at least one of the following: The load signal includes the load current, and the change in the load current within a preset time period is greater than a preset current change threshold. The load signal includes the output voltage of the power supply, and the voltage change of the output voltage within a preset time period is greater than a preset voltage change threshold. The load signal includes a wake-up signal for indicating that the load has switched to the working state, wherein the voltage or current change of the wake-up signal within a preset time period is greater than a preset trigger threshold.