Power supply circuit, electronic device and power supply method

Abstract

The embodiments of the present application provide a power supply circuit, an electronic device and a power supply method. The power supply circuit includes an energy storage module, a power amplifier circuit, a voltage stabilizing circuit, a first output terminal and a second output terminal. The amplifying input terminal of the power amplifier circuit is electrically connected to the energy storage module, the amplifying output terminal of the power amplifier circuit is respectively connected to the first output terminal and the second output terminal, the voltage stabilizing circuit is electrically connected to the amplifying input terminal, the energy storage module is used to store electric energy and provide a power supply signal to the power amplifier circuit, the power amplifier circuit is used to receive and amplify the power supply signal and transmit it to the first output terminal and the second output terminal, and the voltage stabilizing circuit is used to output a supplementary power supply signal to the power amplifier circuit when the current at the first output terminal is greater than a preset threshold current and the amount of electricity stored in the energy storage module is less than a preset amount of electricity, thereby effectively eliminating the problem of a drop in the operating voltage of the power management circuit when the load circuit draws current, thereby improving the voltage stability of the power amplifier circuit and the power management circuit.

Description

Technical Field

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

[0002] At present, mobile electronic devices such as mobile phones and tablet computers are becoming more and more popular. Electronic devices are basically equipped with load devices such as speakers or receivers. When the speaker device is working normally, the average current is not high, but the peak current is usually relatively large. When the peak current is large, the current of the electrically connected circuit components may be drawn, causing the voltage of the adjacent electrically connected circuit components to drop instantly, thereby affecting the normal operation of the related components. For example, due to the architectural design of the terminal device, the power supply of the speaker is sometimes made before the power management circuit (Power Management IC, PMIC), that is, the voltage signal output by the power amplifier circuit is first transmitted to the speaker and then to the PMIC. When the speaker has a peak current that causes the power amplifier circuit to draw instantaneous current, it will affect the output voltage of the power amplifier circuit, causing the output voltage to drop, and then causing the operating voltage of the PMIC to drop. Since the PMIC is usually provided with an undervoltage protection circuit, when the operating voltage of the PMIC drops to a preset value, the undervoltage protection circuit will control to directly cut off the power supply of the electronic device to protect the PMIC, thereby affecting the normal operation of the electronic device and the stability of the circuit system.

[0003] Therefore, how to eliminate the current draw problem caused by the load circuit is an issue that needs to be solved urgently. Summary of the invention

[0004] In order to solve the aforementioned technical problems, the embodiments of the present application provide a power supply circuit, an electronic device and a power supply method which can effectively eliminate the current draw phenomenon caused by the load circuit.

[0005] In a first aspect, the present application provides a power supply circuit, comprising an energy storage module, a power amplifier circuit, a voltage stabilizing circuit, a first output terminal and a second output terminal, wherein the amplifying input terminal of the power amplifier circuit is electrically connected to the energy storage module, the amplifying output terminal of the power amplifier circuit is respectively connected to the first output terminal and the second output terminal, the voltage stabilizing circuit is electrically connected to the amplifying input terminal, the energy storage module is used to store electric energy and provide a power supply signal to the power amplifier circuit, the power amplifier circuit is used to receive and amplify the power supply signal and transmit it to the first output terminal and the second output terminal, and the voltage stabilizing circuit is used to output a supplementary power supply signal to the power amplifier circuit when the current at the first output terminal is greater than a preset threshold current and the amount of electricity stored in the energy storage module is less than a preset amount of electricity.

[0006] When the current at the first output end of the voltage stabilizing circuit is greater than a preset threshold current and the amount of electricity stored in the energy storage module is less than a preset amount of electricity, a supplementary power signal is output to the power amplifier circuit, thereby effectively eliminating the problem of a drop in the operating voltage of the power management circuit when the load circuit draws current, thereby improving the voltage stability of the power amplifier circuit and the power management circuit.

[0007] Optionally, the voltage stabilizing circuit includes a control module and a compensation module, the compensation module is electrically connected to the power supply voltage terminal and the control module, and the control module is electrically connected to the power amplifier circuit; the control module is used to control the compensation module to output a supplementary power signal to the power amplifier circuit when the current at the first output terminal is greater than a preset threshold current and the stored power of the energy storage module is less than a preset power, wherein when the current at the first output terminal is greater than the preset threshold, the voltage at the amplifier input terminal is less than or equal to the first preset voltage.

[0008] When the current at the first output end is greater than the preset threshold current and the stored power of the energy storage module is less than the preset power, the control module can control the compensation module to output a supplementary power signal to the power amplifier circuit for compensating the load circuit through the power amplifier circuit.

[0009] Optionally, the compensation module includes a first capacitor, which is connected between the power supply voltage terminal and the ground terminal. The control module includes a first switch tube, the control terminal of the first switch tube is electrically connected to the reference voltage terminal, the first conductive end of the first switch tube is electrically connected to the amplifier input terminal of the power amplifier circuit, and the second conductive end of the first switch tube is electrically connected to the first capacitor; the first switch tube is used to receive a reference voltage from the reference voltage terminal when the amount of electricity stored in the energy storage module is less than a preset amount of electricity, and is turned on when the current at the first output terminal is greater than a preset threshold current. The first capacitor outputs a supplementary power signal to the amplifier input terminal through the first switch tube.

[0010] Optionally, when the voltage at the amplifying input terminal is less than or equal to a first preset voltage, the voltage difference between the reference voltage terminal and the amplifying input terminal is greater than a preset voltage difference to control the first switch tube to conduct, and the preset voltage difference is the threshold voltage of the first switch tube.

[0011] When the current at the first output terminal is greater than the preset threshold current, the voltage at the amplifier output terminal of the power amplifier circuit drops due to current extraction. When the voltage at the amplifier input terminal drops and is less than the first preset voltage, the first switch tube is turned on under the control of the reference voltage and the voltage at the amplifier input terminal. The first capacitor outputs a supplementary power supply signal to the power amplifier circuit through the first switch tube to compensate for the load circuit.

[0012] Optionally, the control module includes a sampling unit, a comparing unit and an adjusting unit, the sampling unit is electrically connected to the amplifying input terminal and the comparing unit, the comparing unit is also electrically connected to the reference voltage terminal and the adjusting unit, and the adjusting unit is also electrically connected to the compensation module and the amplifying input terminal; the sampling unit is used to collect the voltage of the amplifying input terminal and transmit it to the comparing unit, the comparing unit is used to output a first control signal to the adjusting unit when the voltage of the amplifying input terminal is less than or equal to a first preset voltage, and is used to output a second control signal to the adjusting unit when the voltage of the amplifying input terminal is greater than the first preset voltage, the adjusting unit receives a supplementary power supply signal from the compensation module according to the first control signal and transmits it to the amplifying input terminal, and the adjusting unit stops receiving the supplementary power supply signal from the compensation module according to the second control signal.

[0013] Optionally, the sampling unit includes a first resistor, a second resistor and a sampling node, the first resistor is electrically connected between the amplifier input terminal and the sampling node, the second resistor is electrically connected between the sampling node and the ground terminal, and the first resistor and the second resistor are used to sample the voltage of the amplifier input terminal.

[0014] Optionally, the comparison unit includes an operational amplifier, the adjustment unit includes a second switch tube, the non-phase terminal of the operational amplifier is electrically connected to the sampling node, the inverting terminal of the operational amplifier is electrically connected to the reference voltage terminal, the output terminal of the operational amplifier is electrically connected to the control terminal of the second switch tube, the first conductive terminal of the second switch tube is electrically connected to the compensation module, and the second conductive terminal of the second switch tube is electrically connected to the amplification input terminal; when the voltage of the sampling node is less than or equal to the voltage of the reference voltage terminal, the operational amplifier outputs a first control signal to the second switch tube to control the conduction of the second switch tube; when the voltage of the sampling node is greater than the voltage of the reference voltage terminal, the operational amplifier outputs a second control signal to the second switch tube.

[0015] Optionally, the power supply circuit also includes a charge and discharge management circuit and a voltage conversion circuit, the charge and discharge management circuit is electrically connected to the energy storage module and the voltage conversion circuit, and the voltage conversion circuit is electrically connected to the amplifier input end; the charge and discharge management circuit is used to control the energy storage module to store electrical energy and output power signals, and the voltage conversion circuit is used to convert the power signal into voltage and transmit it to the voltage stabilization circuit and the power amplifier circuit.

[0016] In a second aspect, the present application also provides an electronic device comprising a load circuit, a power management circuit and the aforementioned power supply circuit, wherein a first output end of the power supply circuit is electrically connected to the load circuit, a second output end of the power supply circuit is electrically connected to the power management circuit, and the power supply circuit is used to maintain the voltage output from the second output end to the power management circuit when a load current drawn by the load circuit is greater than a preset threshold current.

[0017] By using the power supply circuit to supplement the load circuit with a preset charge amount when the load current drawn is greater than the preset threshold current, the influence of the load circuit drawing current on the working voltage in the power management circuit can be effectively eliminated, thereby improving the working stability of the power management circuit.

[0018] In a third aspect, the present application also provides a power supply method, which is applied to the aforementioned power supply circuit, including: judging the power of the energy storage module, if the power of the energy storage module is less than a preset power and the current of the first output end is greater than a preset threshold current, controlling the voltage stabilizing circuit to start and output a supplementary power signal to the power amplifier circuit.

[0019] Optionally, it also includes judging the voltage of the amplifier input terminal of the power amplifier circuit. If the power of the energy storage module is less than a preset power and the voltage of the amplifier input terminal is less than a first preset voltage, controlling the voltage stabilizing circuit to start and output a supplementary power signal to the power amplifier circuit.

[0020] Optionally, "controlling the voltage stabilizing circuit to start and output a supplementary power signal to the power amplifier circuit" includes: providing a reference voltage for the voltage stabilizing circuit when the amount of electricity stored in the energy storage module is less than a preset amount of electricity; when the voltage at the amplifier input end is less than the first preset voltage and the difference with the reference voltage is greater than a preset voltage difference, the voltage stabilizing circuit outputs the supplementary power signal to the amplifier input end.

[0021] Optionally, when the amount of electricity stored in the energy storage module is equal to or greater than a preset amount of electricity, or the second output terminal is greater than or equal to the first preset voltage, the voltage stabilizing circuit stops outputting the supplementary power signal to the amplifying input terminal.

[0022] Compared with the existing technical problems, in the power supply circuit provided by the present application, a voltage stabilizing circuit is set at the amplifier input end of the power amplifier circuit, and when the power of the energy storage module is less than the preset power and the current of the first output end is greater than the preset threshold current, the voltage stabilizing circuit is controlled to output a supplementary power signal to the power amplifier circuit, thereby effectively compensating for the amount of charge required when the load current draws the load current, effectively avoiding the influence of the load circuit on the working voltage of the power amplifier circuit when drawing the load current, and further avoiding the influence on the working voltage of the power management circuit, preventing the undervoltage protection of the power management circuit, and effectively improving the stability of the operation of the power management circuit.

[0023] It should be understood that the beneficial effects achieved by the technical solutions of the second to third aspects of the embodiments of the present application can be referred to the technical effects of the first aspect and its corresponding possible implementation methods mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of an exploded structure of an electronic device provided in an embodiment of the present application;

[0026] Figure 2 It is a schematic diagram of the internal structure of an electronic device in the related art;

[0027] Figure 3 A schematic diagram of the internal structure of an electronic device provided in an embodiment of the present application;

[0028] Figure 4 A schematic diagram of the internal structure of an electronic device provided in another embodiment of the present application;

[0029] Figure 5 for Figure 3 Equivalent circuit diagram of the medium voltage stabilization circuit;

[0030] Figure 6 A schematic diagram of an equivalent circuit of a control module provided in another embodiment of the present application;

[0031] Figure 7 A flow chart of a power supply method provided in an embodiment of the present application;

[0032] Figure 8 This is a logic diagram for determining whether the voltage stabilizing circuit is started. DETAILED DESCRIPTION

[0033] In order to clearly describe the technical solution of the present application, the words "first", "second" and the like are used to distinguish the same or similar items with substantially the same functions and effects. Those skilled in the art can understand that the words "first", "second" and the like do not limit the quantity and execution order, and the words "first", "second" and the like do not necessarily limit the difference.

[0034] References to "one embodiment" or "some embodiments" etc. described in the specification of the present application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in the specification of the present application do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0035] Before explaining the power supply circuit provided in the embodiment of the present application in detail, the application scenario of the power supply circuit is first explained.

[0036] The power supply circuit is applied to electronic devices. The electronic devices of the embodiments of the present application may include handheld devices with image processing functions, vehicle-mounted devices, etc. For example, some electronic devices are: mobile phones, tablet computers, PDAs, laptop computers, mobile Internet devices (MID), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, smart Wireless terminals in smart cities, wireless terminals in smart homes, cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, terminal devices in 5G networks, or terminal devices in future evolved public land mobile networks (PLMNs), etc. The embodiments of the present application are not limited to this.

[0037] As an example but not limitation, in the embodiments of the present application, the electronic device may also be a wearable device. Wearable devices may also be referred to as wearable smart devices, which are a general term for wearable devices that are intelligently designed and developed using wearable technology for daily wear, such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothes or accessories. Wearable devices are not only hardware devices, but also powerful functions achieved through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include full-featured, large-sized, and fully or partially independent of smartphones, such as smart watches or smart glasses, as well as devices that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various types of smart bracelets and smart jewelry for vital sign monitoring.

[0038] In addition, in the embodiments of the present application, the electronic device can also be a terminal device in the Internet of Things (IoT) system. IoT is an important part of the future development of information technology. Its main technical feature is to connect objects to the network through communication technology, thereby realizing an intelligent network that interconnects people and machines and things.

[0039] The electronic device in the embodiments of the present application may also be referred to as: terminal equipment, user equipment (UE), mobile station (MS), mobile terminal (MT), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication equipment, user agent or user device, etc.

[0040] In an embodiment of the present application, the electronic device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. The hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and a memory (also called main memory). The operating system can be any one or more computer operating systems that implement business processing through processes, such as Linux operating system, Unix operating system, Android operating system, iOS operating system, or Windows operating system. The application layer includes applications such as browsers, address books, word processing software, and instant messaging software.

[0041] See also Figure 1 , Figure 1 A schematic diagram of an exploded structure of an electronic device 100 provided in an embodiment of the present application.

[0042] like Figure 1 As shown, the electronic device 100 includes: a display screen 11, a back cover 12, a middle frame 13, a circuit board 14 and a battery 15. The middle frame 13, the circuit board 14 and the battery 15 are arranged between the display screen 11 and the back cover 12. The circuit board 14 and the battery 15 can be arranged on the middle frame 13, for example, the circuit board 14 and the battery 15 are arranged on the side of the middle frame 13 facing the back cover 12. In other embodiments, the circuit board 14 and the battery 15 can also be arranged on the side of the middle frame 13 facing the display screen 11.

[0043] The battery 15 can be connected to other devices through a charge and discharge management chip (not shown in the figure). The charge and discharge management chip can receive the electric energy output by the battery 15 and power the processor, internal memory, external memory, display screen 11, camera and communication module in the electronic device 100. The charge and discharge management chip can also be used to monitor parameters such as battery capacity, battery cycle number, battery health status (leakage, impedance). The charge and discharge management chip can also receive external input electric energy to charge the battery 15. In some embodiments, the charge and discharge management chip can be integrated in the circuit board 14.

[0044] The display screen 11 may be an organic light emitting diode (OLED) display screen or a liquid crystal display (LCD). It should be understood that the display screen 11 may include a display and a touch control device, the display is used to output display content to the user, and the touch control device is used to receive touch events input by the user on the display screen 11.

[0045] The back cover 12 may be a metal back cover, a glass back cover, a plastic back cover, or a ceramic back cover. In the embodiment of the present application, the material of the back cover 12 is not limited.

[0046] The middle frame 13 may include a metal plate 131 and a frame. The frame is arranged around the outer edge of the metal plate 131. Generally speaking, the frame may be a square frame. For example, the frame may include a top frame 132 and a bottom frame 133 that are arranged opposite to each other, and a left frame 134 and a right frame 135 that are located between the top frame 132 and the bottom frame 133 and are arranged opposite to each other. In this embodiment, the side of the middle frame 13 is the surface surrounded by the top frame 132, the bottom frame 133, the left frame 134 and the right frame 135. The metal plate 131 may be an aluminum plate, an aluminum alloy, or a magnesium alloy. Each frame may be a metal frame, a ceramic frame, or a glass frame. The metal middle frame 13 and the frame may be welded, clamped or integrally formed, or the metal middle frame 13 and the frame may be connected by injection molding of plastic parts.

[0047] The circuit board 14 is one of the important components of the terminal device and is a necessary carrier for software implementation. The circuit board 14 includes: a substrate, functional devices installed on the substrate, and other components installed on the substrate. Functional devices include but are not limited to: a voltage conversion circuit for converting voltage, a power amplifier circuit (poweramplifier, PA) for signal amplification, a camera for taking photos and videos, and can also be a timing controller for controlling the display of the display screen 11, or a device for controlling the implementation of other functions (such as charging function, image processing function, etc.). The embodiment of the present application does not limit the specific functions of the functional devices. Other components include but are not limited to resistors, capacitors, inductors, memory cards, sensors or shielding plates, etc. The circuit board 14 may also include accessories such as nuts and bolts for fixing. Components can be mounted on the substrate through solder joints.

[0048] It is understandable that the circuit board 14 may have raised and / or recessed positions based on different components. The specific shape of the circuit board 14, the position and size of the components, etc. are related to the design layout of the terminal device, and the embodiment of the present application does not specifically limit this.

[0049] In some embodiments, Figure 1 As shown, the electronic device 100 may also include a camera and a flash (not shown in the figure). The camera may include a front camera 161 and a rear camera 162. The rear camera 162 and the flash may be arranged on the side of the metal plate 131 facing the rear cover 12, and the rear cover 12 may have mounting holes for the flash and the rear camera 162 to be installed. The front camera 161 may be arranged on the side of the metal plate 131 facing the display screen 11. In some embodiments, the front camera 161 provided in the electronic device 100 may include one or more cameras, and the rear camera 162 may also include one or more cameras.

[0050] The relevant technologies of this application are described below.

[0051] See also Figure 2 , Figure 2 It is a schematic diagram of the internal structure of an electronic device 100 in the related art.

[0052] like Figure 2 As shown, the electronic device 100 includes an energy storage module 211, a charge and discharge management circuit 212, a voltage conversion circuit 213, a power amplifier circuit 214, a load circuit 22, and a power management circuit 23. The energy storage module 211 can be Figure 1The battery 15 in the electronic device 100. When the electronic device 100 is working, the energy storage module 211 outputs electric energy to the charge and discharge management circuit 212, wherein the charge and discharge management circuit 212 can be a charge and discharge management chip. When the charge and discharge management circuit 212 is working, it outputs the initial electric signal to the voltage conversion circuit 213. The voltage conversion circuit 213 can convert the initial electric signal into a voltage and output it to the power amplifier circuit 214. The power amplifier circuit 214 is electrically connected to the load circuit 22 and the power management circuit 23, and the power amplifier circuit 214 is used to amplify the received power signal and transmit it to the load circuit 22 and the power management circuit 23. Among them, the load circuit 22 can be a speaker device such as a handset, a speaker, etc. in the electronic device 100, and of course it can also be other components with a large peak current in the electronic device.

[0053] Since the peak current of the load circuit 22 is relatively large when working, which can usually reach 5A or even higher instantly, the power amplifier circuit 214 instantly draws more current, and since the power amplifier circuit 214 used to power the load circuit 22 is arranged before the power management circuit 23, when the load circuit 22 draws current from the circuit, it will cause the instantaneous voltage of the power management circuit 23 to drop, especially when the battery power is low, which may trigger the undervoltage protection (Undervoltage-Lockout, UVLO), thereby causing the system to directly cut off the power supply, affecting the normal operation of the electronic device 100.

[0054] Based on this, an embodiment of the present application provides a power supply circuit and an electronic device, which is used to provide the required amount of charge to the power amplifier circuit when a transient large current appears in the load circuit, causing current withdrawal, thereby eliminating the current withdrawal phenomenon and maintaining the stability of the power amplifier circuit and the power management circuit.

[0055] See also Figure 3 , Figure 3 A schematic diagram of the internal structure of an electronic device 100 provided in an embodiment of the present application.

[0056] like Figure 3 As shown, the electronic device 100 includes a power supply circuit 21 , a load circuit 22 and a power management circuit 23 , wherein a first output terminal out1 of the power supply circuit 21 is electrically connected to the load circuit 22 , and a second output terminal out2 of the power supply circuit 21 is electrically connected to the power management circuit 23 .

[0057] Among them, the power supply circuit 21 includes an energy storage module 211, a power amplifier circuit 214 and a voltage stabilizing circuit 215. The amplifying input terminal p1 of the power amplifier circuit 214 is electrically connected to the energy storage module 211, the amplifying output terminal p2 of the power amplifier circuit 214 is electrically connected to the first output terminal out1 and the second output terminal out2, and the voltage stabilizing circuit 215 is electrically connected to the amplifying input terminal p1 of the power amplifier circuit 214. The energy storage module 211 is used to store electric energy and provide a power supply signal to the power amplifier circuit 214. The power amplifier circuit 214 is used to receive and amplify the power supply signal and transmit it to the first output terminal out1 and the second output terminal out2. The voltage stabilizing circuit 215 is used to output a supplementary power supply signal to the power amplifier circuit 214 when the current at the first output terminal out1 is greater than a preset threshold current and the stored power of the energy storage module 211 is less than the preset power, so as to eliminate the current drawing effect of the load circuit 22 on the power amplifier circuit 214.

[0058] In another embodiment, if Figure 4 As shown, the power supply circuit 21 may also include a charge and discharge management circuit 212 and a voltage conversion circuit 213. The charge and discharge management circuit 212 is electrically connected to the energy storage module 211 and the voltage conversion circuit 213. The voltage conversion circuit 213 is electrically connected to the amplification input terminal p1 of the power amplifier circuit 214. The charge and discharge management circuit 212 is used to control the energy storage module 211 to store electric energy and output power signals. The voltage conversion circuit 213 is used to convert the power signal into voltage and transmit it to the voltage stabilizing circuit 215 and the power amplifier circuit 214.

[0059] Exemplarily, the operating voltage of the power amplifier circuit 214 is Vpa, that is, the voltage of the amplification input terminal p1 of the power amplifier circuit 214 or the voltage received by the power amplifier circuit 214 is Vpa, and the voltage of the power management circuit 23 when maintaining normal operation is Vpm, that is, the voltage of the second output terminal out2 or the voltage received by the power management circuit 23 is Vpm, wherein Vpm=Vpa-I*R>V UVIO , I is the current transmitted from the power amplifier circuit 214 to the power management circuit 23, R is the impedance between the power amplifier circuit 214 and the power management circuit 23, V UVIO is the trigger voltage of undervoltage protection. When the operating voltage Vpm of the power management circuit 23 is less than V UVIO When the system cuts off the power supply of the electronic device 100, the system will directly cut off the power supply of the electronic device 100 to protect the system circuit.

[0060] When the load circuit 22 has a peak current, the current at the first output terminal out1 is less than the preset current threshold value, which causes the operating voltage Vpa of the power amplifier circuit 214 to be less than the first preset voltage V1. When the operating voltage Vpa of the power amplifier circuit 214 is less than the first preset voltage V1, the operating voltage Vpm of the power management circuit 23 is further less than the second preset voltage V2. The voltage regulator circuit 215 outputs a supplementary power signal to the amplifier input terminal p1 of the power amplifier circuit 214 to supplement the voltage required by the power amplifier circuit 214, or to supplement the amount of charge required by the load circuit 22 to draw current, thereby avoiding the voltage reduction in the power management circuit 23 triggering undervoltage protection when the load circuit 22 draws current, wherein V2=V1-I*R. That is, when the voltage of the amplifying input terminal p1 of the power amplifier circuit Vpa drops to the first preset voltage V1 or the voltage of the power management circuit 23 drops to the second preset voltage V2, the voltage regulator circuit 215 is started to output a supplementary power signal to the power amplifier circuit 214 to supplement the charge required by the load circuit 22, wherein Vpm>V2>V UVIO .

[0061] See also Figure 5 , Figure 5 for Figure 3 Schematic diagram of an equivalent circuit of the medium voltage stabilizing circuit 215.

[0062] like Figure 5 As shown, the voltage stabilizing circuit 215 includes a control module 2151 and a compensation module 2152, wherein the control module 2151 is electrically connected to the compensation module 2152, the power amplifier circuit 214 and the power supply voltage terminal VDD, and the compensation module 2152 is also electrically connected to the power supply voltage terminal VDD. When the peak current of the load circuit 22 causes current withdrawal, resulting in Vpa≤V1, the control module 2151 controls the compensation module 2152 to output a supplementary power signal to the power amplifier circuit 214, so that the power amplifier circuit 214 compensates the load circuit 22 with a preset charge amount, so as to eliminate the influence of the load circuit 22 withdrawal current on the power amplifier circuit 214 and the power management circuit 23. The power supply voltage terminal VDD is used to cooperate with the compensation module 2152 to provide power to the load circuit 22.

[0063] In an exemplary embodiment, the power supply voltage terminal VDD can be a circuit that outputs a high voltage signal, for example, a boost circuit, a buck-boost circuit, or a charge pump circuit, etc. Of course, it can also be set to other types of high-voltage circuits according to specific needs, and the present application does not limit this.

[0064] Specifically, the control module 2151 includes a first switch tube T1, the compensation module 2152 includes a first capacitor C1, the control end of the first switch tube T1 is electrically connected to the reference voltage end, the first conductive end of the first switch tube T1 is electrically connected to the amplification input end p1 of the power amplifier circuit 214, the second conductive end of the first switch tube T1 is electrically connected to the power supply voltage end VDD, the first end of the first capacitor C1 is electrically connected to the power supply voltage end VDD, and the second end of the first capacitor C1 is electrically connected to the ground end GND. The first switch tube T1 is used to receive the reference voltage Vref from the reference voltage end when the amount of electricity stored in the energy storage module 211 is less than the preset amount of electricity, and is turned on when the current at the first output end out1 is greater than the preset threshold current, and the first capacitor C1 outputs a supplementary power signal to the amplification input end p1 through the first switch tube T1.

[0065] In this embodiment, the first switch tube T1 is an N-type transistor, the control end of the first switch tube T1 can be a gate g, the first conductive end of the first switch tube T1 can be a source s, and the second conductive end of the first switch tube T1 can be a drain d. Of course, the first switch tube T1 can also be set as a P-type transistor or other load switch according to specific needs. Similarly, the first conductive end can also be set as a drain d, and the second conductive end can be set as a source s. This application does not limit this.

[0066] The reference voltage terminal is used to provide a constant reference voltage Vref for the gate of the first switch tube T1, and the operating voltage of the power amplifier circuit 214 is Vpa (i.e., the voltage of the amplified input terminal p1), wherein Vref-Vpa<Vth, Vth is the threshold voltage of the first switch tube T1, that is, the voltage difference between the gate and the source of the first switch tube T1 is less than the threshold voltage, at which time the first switch tube T1 is in the cut-off state (non-conducting state).

[0067] When the power of the energy storage module 211 is greater than or equal to the preset power, the first switch tube T1 maintains the cut-off state. When the power of the energy storage module 211 is less than the preset power, if the current of the first output terminal out1 is greater than the threshold current, that is, the load circuit 22 draws the current, causing the operating voltage Vpa of the power amplifier circuit 214 to drop to the first preset voltage V1, so that the voltage difference between the gate and the source of the first switch tube T1 is greater than the preset threshold voltage (Vref-V1≥Vth), the first switch tube T1 is turned on to control the first capacitor C1 to output the supplementary power signal to the power amplifier circuit 214, and discharge to the load circuit 22 through the power amplifier circuit 214, so as to provide the required amount of charge for the load circuit 22, thereby eliminating the draw of current in the circuit by the load circuit 22.

[0068] like Figure 6 As shown, Figure 6This is a schematic diagram of an equivalent circuit of a control module 2151 provided in another embodiment of the present application.

[0069] In this embodiment, the control module 2151 may be a low-dropout regulator (LDO). The LDO is electrically connected to the compensation module 2152, the power amplifier circuit 214 and the power supply voltage terminal VDD. When Vpa>V1, the LDO is not turned on. When Vpa≤V1, the LDO is turned on. The compensation module 2152 outputs a supplementary power signal to the power amplifier circuit 214 through the LDO, so that the power amplifier circuit 214 compensates the load circuit 22 with a preset charge amount, so as to eliminate the influence of the load current of the load circuit 22 on the power amplifier circuit 214 and the power management circuit 23.

[0070] Specifically, when the control module 2151 is an LDO, the control module 2151 includes a sampling unit 51a, a comparison unit 51b and an adjustment unit 51c, wherein the sampling unit 51a is electrically connected to the amplification input terminal p1 and the comparison unit 51b, the comparison unit 51b is also electrically connected to the reference voltage terminal and the adjustment unit 51c, and the adjustment unit 51c is also electrically connected to the compensation module 2152 and the amplification input terminal p1, wherein the sampling unit 51a is used to sample the voltage (i.e., Vpa) of the amplification input terminal p1 and transmit it to the comparison unit 51b, when Vpa≤V1, the comparison unit 51b outputs a first control signal to the adjustment unit 51c, and the adjustment unit 51c receives the supplementary power signal from the compensation module 2152 according to the first control signal and transmits it to the amplification input terminal p1. When Vpa>V1, the comparison unit 51b outputs a second control signal to the adjustment unit 51c, and the adjustment unit 51c maintains a cut-off state according to the second control signal, i.e., does not receive the supplementary power signal in the compensation module 2152.

[0071] Among them, the control module 2151 also includes a first voltage stabilizing unit 51d and a second voltage stabilizing unit 51e. The first voltage stabilizing unit 51d is electrically connected to the adjustment unit 51c, and is used to maintain the stability of the voltage received by the adjustment unit 51c. The second voltage stabilizing unit 51e is electrically connected to the sampling unit 51a and the adjustment unit 51c, and is used to maintain the stability of the voltage collected by the sampling unit 51a and maintain the stability of the voltage output by the adjustment unit 51c.

[0072] Specifically, the sampling unit 51a includes a first resistor R1, a second resistor R2 and a sampling node N, the first end of the first resistor R1 is electrically connected to the amplifying input terminal p1, the second end of the first resistor R1 is electrically connected to the sampling node N, the first end of the second resistor R2 is electrically connected to the sampling node N, the second end of the second resistor R2 is electrically connected to the ground terminal GND, and the first resistor R1 and the second resistor R2 are used to collect the voltage signal of the amplifying input terminal p.

[0073] The comparison unit 51b includes an operational amplifier OP, a non-phase terminal of the operational amplifier OP is electrically connected to the sampling node N, an inverting terminal of the operational amplifier OP is electrically connected to the reference voltage terminal, and an output terminal of the operational amplifier OP is electrically connected to the adjustment unit 51c. The non-phase terminal of the operational amplifier OP is used to obtain the voltage of the amplified input terminal P from the sampling node N, and compare the sampled voltage with the reference voltage Vref received at the inverting terminal. When the voltage at the non-phase terminal is less than or equal to the voltage at the inverting terminal, the operational amplifier OP outputs a first control signal to the adjustment unit 51c, and when the voltage at the non-phase terminal is greater than the voltage at the inverting terminal, the operational amplifier OP outputs a second control signal to the adjustment unit 51c.

[0074] In this embodiment, the voltage of the reference voltage terminal Vref can be a first preset voltage V1. When the voltage of the amplified input terminal p1 collected by the sampling unit 51a is less than or equal to the first preset voltage V1 (that is, Vpa≤V1), the operational amplifier OP outputs a first control signal to the adjustment unit 51c. When the voltage of the amplified input terminal p1 collected by the sampling unit 51a is greater than the first preset voltage V1 (that is, Vpa>V1), the operational amplifier OP outputs a second control signal to the adjustment unit 51c.

[0075] The adjustment unit 51c includes a second switch tube T2, the control end of the second switch tube T2 is electrically connected to the output end of the operational amplifier OP, a first conductive end compensation module 2152 of the second switch tube T2, and a second conductive end of the second switch tube T2 is electrically connected to the amplifier input end p. When the control end of the second switch tube T2 receives a first control signal, the second switch tube T2 is turned on, and the compensation module 2152 outputs a supplementary power signal to the amplifier input end p1 through the second switch tube T2. When the control end of the second switch tube T2 receives a second control signal, the second switch tube T2 is turned off.

[0076] In this embodiment, the second switch tube T2 is a P-type transistor, the control end of the second switch tube T2 can be a gate, the first conductive end can be a source, and the second conductive end can be a drain. The second switch tube T2 is used to be turned on under the control of a low-level signal, that is, the first control signal output by the operational amplifier OP is a low-level signal, and the second control signal is a high-level signal. Of course, the type of the second switch tube T2 can also be set according to specific needs, such as it can also be set to an N-type transistor, etc., and the present application does not limit this.

[0077] The first voltage stabilizing unit 51d includes a second capacitor C2, and the second voltage stabilizing unit 51e includes a third capacitor C3. The first end of the second capacitor C2 is electrically connected between the compensation module 2152 and the first conductive end of the second switch tube T2, and the second end of the second capacitor C2 is electrically connected to the ground terminal GND, which is used to maintain the stability of the voltage received by the second switch tube T2. The first end of the third capacitor C3 is electrically connected between the first resistor R1 and the amplification input terminal p1, and the second end of the third capacitor C3 is electrically connected to the ground terminal GND, which is used to maintain the stability of the voltage collected by the sampling unit 51a, and maintain the stability of the voltage output by the second switch tube T2.

[0078] The process of eliminating the draw current is described below from the perspective of energy. For example, when the first preset voltage V1=2.7V, if the instantaneous draw current of the load circuit 22 is 5A and the draw time is 22us, C1=22uf is set at this time, and the output voltage of the power supply voltage terminal VDD is 7.6V, that is, the power supply voltage terminal VDD outputs a high voltage electrical signal. At this time, from the perspective of energy, the amount of charge △Q required by the load circuit 22=△I*t=5A*22us, and the amount of charge △Q provided by the first capacitor C1=C*△U=22uf*(7.6V-2.7V), where 22uf*(7.6V-2.7V)≈5A*22us, that is, C*△U=△I*t=△Q, that is, the amount of charge provided by the first capacitor C1 and the power supply voltage terminal VDD is almost the same as the amount of charge required by the load circuit 22 to draw the current, thereby eliminating the influence of the load circuit 22 on the normal working voltage of the power amplifier circuit 214 and the power management circuit 23 when drawing the current.

[0079] At the same time, from the perspective of time, the conduction time Ton of the first switch tube T1 is generally in the nanosecond level (ns), the discharge time of the first capacitor C1 is 22uf*1mohm, that is, in the nanosecond nanometer level (ns), the power amplifier circuit 214 is audio, the audio range is 20-20000Hz, and the instantaneous large current draw is measured in the microsecond level (us), which can meet the current peak time of the load circuit 22. Therefore, by providing a preset charge amount when the load circuit 22 draws current through the compensation module 2152 and the power supply voltage terminal VDD, the voltage drop of the power amplifier circuit 214 and the power management circuit 23 caused by the instantaneous draw can be effectively avoided, and the stability of the power amplifier circuit 214 and the power management circuit 23 during operation is effectively improved.

[0080] See also Figure 7 , Figure 7 A flow chart of a power supply method provided in an embodiment of the present application.

[0081] like Figure 7 As shown, the specific steps of the power supply method include:

[0082] Step S100, determining the power of the energy storage module, if the power of the energy storage module is less than a preset power and the current of the first output terminal is greater than a preset threshold current, controlling the voltage stabilizing circuit to start and output a supplementary power signal to the power amplifier circuit.

[0083] Specifically, Figure 8 As shown, Figure 8 This is a logic diagram for determining whether the voltage stabilizing circuit is started.

[0084] Step S1, charging the first capacitor.

[0085] The power supply voltage terminal VDD is controlled to charge the first capacitor C1, so as to control the first capacitor C1 to store a preset charge amount, so as to prepare in advance for the load circuit to draw a load current.

[0086] Step S2, determine whether the power Vb of the energy storage module is greater than the preset power Vx. When the power of the energy storage module 211 is greater than the preset power, maintain the voltage of the first capacitor C1. The preset power Vx can be set to 30%, 40% or 50% of the total power, etc., and can certainly be set according to specific needs, and this application does not limit this.

[0087] Step S3, providing a reference voltage. Specifically, when the power Vb of the energy storage module 211 is less than the preset power Vx, the reference voltage terminal provides a reference voltage Vref to the gate of the first switch tube T1. The reference voltage Vref is a constant voltage.

[0088] Step S4, when Vpa≤V1, controlling the first capacitor to output a supplementary power signal to the amplifier input terminal.

[0089] When Vpa is greater than V1, that is, the operating voltage of the power amplifier circuit 214 is greater than the first preset voltage V1, Vref-Vpa<Vth, and the first switch tube T1 is in the cut-off state. When the load circuit 22 draws the load current, causing the operating voltage Vpa of the power amplifier circuit 214 to drop to less than or equal to the first preset voltage V1, so that Vref-V1≥Vth, that is, when the voltage difference between the gate and the first switch tube T1 is greater than the threshold voltage, the first switch tube T1 is turned on to control the first capacitor C1 to output the supplementary power signal to the amplifier input terminal p1, so as to provide the required amount of charge for the load circuit 22 through the power amplifier circuit 214, thereby eliminating the influence of the load circuit 22 drawing the load current on the power amplifier circuit 214 and the power management circuit 23, and effectively improving the voltage stability.

[0090] The above disclosure is only part of the embodiments of the present application, which certainly cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A power supply circuit, characterized in that: It includes an energy storage module, a power amplifier circuit, a voltage stabilizing circuit, a first output end and a second output end, wherein the amplifying input end of the power amplifier circuit is electrically connected to the energy storage module, the amplifying output end of the power amplifier circuit is respectively connected to the first output end and the second output end, the voltage stabilizing circuit is electrically connected to the amplifying input end, the energy storage module is used to store electric energy and provide a power supply signal for the power amplifier circuit, the power amplifier circuit is used to receive and amplify the power supply signal and transmit it to the first output end and the second output end, and the voltage stabilizing circuit is used to output a supplementary power supply signal to the power amplifier circuit when the current of the first output end is greater than a preset threshold current and the amount of electricity stored in the energy storage module is less than a preset amount of electricity; The voltage stabilizing circuit includes a control module and a compensation module, wherein the compensation module is electrically connected to the power supply voltage terminal and the control module, wherein the control module is electrically connected to the power amplifier circuit, wherein the control module includes a sampling unit, a comparison unit and an adjustment unit, wherein the sampling unit is electrically connected to the amplifier input terminal and the comparison unit, wherein the comparison unit is also electrically connected to the reference voltage terminal and the adjustment unit, and wherein the adjustment unit is also electrically connected to the compensation module and the amplifier input terminal; The sampling unit is used to collect the voltage of the amplifying input terminal and transmit it to the comparing unit. The comparing unit is used to output a first control signal to the adjusting unit when the voltage of the amplifying input terminal is less than or equal to a first preset voltage, and is used to output a second control signal to the adjusting unit when the voltage of the amplifying input terminal is greater than the first preset voltage. The adjusting unit receives the supplementary power signal from the compensation module according to the first control signal and transmits it to the amplifying input terminal. The adjusting unit stops receiving the supplementary power signal from the compensation module according to the second control signal.

2. The power supply circuit according to claim 1, characterized in that: The compensation module includes a first capacitor, which is connected between the power supply voltage terminal and the ground terminal. The control module includes a first switch tube, a control terminal of the first switch tube is electrically connected to the reference voltage terminal, a first conductive terminal of the first switch tube is electrically connected to the amplification input terminal of the power amplifier circuit, and a second conductive terminal of the first switch tube is electrically connected to the first capacitor. The first switch tube is used to receive a reference voltage from the reference voltage terminal when the amount of electricity stored in the energy storage module is less than a preset amount of electricity, and is turned on when the voltage at the amplifier input terminal is less than or equal to the first preset voltage. The first capacitor outputs the supplementary power signal to the amplifier input terminal through the first switch tube.

3. The power supply circuit according to claim 2, characterized in that: When the voltage of the amplifying input terminal is less than or equal to a first preset voltage, the voltage difference between the reference voltage terminal and the amplifying input terminal is greater than a preset voltage difference to control the first switch tube to be turned on, and the preset voltage difference is the threshold voltage of the first switch tube.

4. The power supply circuit according to claim 3, characterized in that: The sampling unit includes a first resistor, a second resistor and a sampling node, the first resistor is electrically connected between the amplifying input terminal and the sampling node, the second resistor is electrically connected between the sampling node and a ground terminal, and the first resistor and the second resistor are used to sample the voltage of the amplifying input terminal.

5. The power supply circuit according to claim 4, characterized in that: The comparison unit includes an operational amplifier, the adjustment unit includes a second switch tube, a non-phase terminal of the operational amplifier is electrically connected to the sampling node, an inverting terminal of the operational amplifier is electrically connected to a reference voltage terminal, an output terminal of the operational amplifier is electrically connected to a control terminal of the second switch tube, a first conductive terminal of the second switch tube is electrically connected to the compensation module, and a second conductive terminal of the second switch tube is electrically connected to the amplification input terminal; The operational amplifier outputs the first control signal to the second switch tube to control the second switch tube to be turned on when the voltage at the sampling node is less than or equal to the voltage at the reference voltage terminal; the operational amplifier outputs the second control signal to the second switch tube when the voltage at the sampling node is greater than the voltage at the reference voltage terminal.

6. The power supply circuit according to any one of claims 1 to 5, characterized in that: The power supply circuit further includes a charge and discharge management circuit and a voltage conversion circuit, wherein the charge and discharge management circuit is electrically connected to the energy storage module and the voltage conversion circuit, and the voltage conversion circuit is electrically connected to the amplifier input terminal; The charge and discharge management circuit is used to control the energy storage module to store electrical energy and output the power signal, and the voltage conversion circuit is used to convert the power signal into a voltage and transmit it to the voltage stabilizing circuit and the power amplifier circuit.

7. An electronic device, characterized in that: It comprises a load circuit, a power management circuit and a power supply circuit as described in any one of claims 1 to 6, wherein a first output terminal of the power supply circuit is electrically connected to the load circuit, a second output terminal of the power supply circuit is electrically connected to the power management circuit, and the power supply circuit is used to maintain a voltage output from the second output terminal to the power management circuit when a load current drawn by the load circuit is greater than a preset threshold current.

8. A power supply method, characterized in that: A power supply circuit as claimed in any one of claims 1 to 6, comprising: The power of the energy storage module is determined. If the power of the energy storage module is less than a preset power and the current of the first output terminal is greater than a preset threshold current, the voltage stabilizing circuit is controlled to start and output a supplementary power signal to the power amplifier circuit.

9. The power supply method according to claim 8, characterized in that: It also includes judging the voltage of the amplifier input terminal of the power amplifier circuit. If the power of the energy storage module is less than the preset power and the voltage of the amplifier input terminal is less than the first preset voltage, the voltage stabilizing circuit is controlled to start and output a supplementary power signal to the power amplifier circuit.

10. The power supply method according to claim 8, characterized in that: The “controlling the voltage stabilizing circuit to start and outputting a supplementary power signal to the power amplifier circuit” includes: Providing a reference voltage to the voltage stabilizing circuit when the amount of electricity stored in the energy storage module is less than a preset amount of electricity; When the voltage at the amplifying input terminal is less than a first preset voltage and the difference between the voltage at the amplifying input terminal and the reference voltage is greater than a preset voltage difference, the voltage stabilizing circuit outputs the supplementary power signal to the amplifying input terminal.

11. The power supply method according to claim 10, characterized in that: When the amount of electricity stored in the energy storage module is equal to or greater than a preset amount of electricity, or the second output terminal is greater than or equal to the first preset voltage, the voltage stabilizing circuit stops outputting the supplementary power signal to the amplifying input terminal.

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