Power supply circuit and electronic device

Abstract

The present application relates to the technical field of circuits. Disclosed are a power supply circuit and an electronic device. The power supply circuit comprises a processing module, a first power source module and a voltage division module. A first end of the voltage division module is connected to an input end of the processing module; a second end of the voltage division module is connected to a feedback end of the first power source module; and a third end of the voltage division module is used for inputting a first voltage, wherein a voltage value of the second end of the voltage division module is positively correlated with a voltage value of the first end of the voltage division module, and the voltage value of the second end of the voltage division module is between the voltage value of the first end of the voltage division module and a voltage value of the third end of the voltage division module. The power supply circuit can reduce a reference voltage input by an input end of a processing module, so as to achieve the aim of reducing the waste of electric energy and improve the endurance capacity of an electronic device, thereby improving the user experience.

Description

Power supply circuits and electronic equipment Technical Field

[0001] This application relates to the field of circuit technology, and in particular to a power supply circuit and electronic device. Background Technology

[0002] Electronic devices include mobile phones, tablets, and the like. Generally, electronic devices have a processing module and a power supply module. When powered on, the processing module transmits a preset voltage value to the power supply module. Upon receiving the preset voltage value, the power supply module supplies power to the input terminal of the processing module according to that preset voltage value. The feedback terminal of the power supply module is also connected to the input terminal of the processing module to detect the reference voltage input to the processing module and ensure that the value of the reference voltage input to the processing module equals the preset voltage value.

[0003] In related technologies, the actual voltage input to the processing module fluctuates continuously around a reference voltage during operation, and the amplitude of the actual voltage relative to the reference voltage is related to the impedance during power transmission. Considering that the impedance during power transmission may be large, and to avoid a small actual voltage input to the processing module during operation, the reference voltage is usually a large voltage, i.e., a large preset voltage value.

[0004] However, by optimizing the impedance during power transmission to a lower level, the processing module does not require a large reference voltage. However, related technologies do not allow adjustment of the preset voltage value, thus preventing the reduction of the reference voltage input to the processing module. This results in wasted power and negatively impacts the battery life of electronic devices.

[0005] Summary of the Invention

[0006] This application provides a power supply circuit and electronic device that can lower the reference voltage input to the processing module's input terminal, thereby reducing power waste, improving the electronic device's battery life, and ultimately enhancing the user experience. The technical solution is as follows:

[0007] In a first aspect, a power supply circuit is provided. This power supply circuit is applied to electronic devices. The power supply circuit includes a processing module, a first power supply module, and a voltage divider module.

[0008] The communication terminal of the processing module is connected to the communication terminal of the first power supply module for transmitting communication signals. The processing module is used to transmit a communication signal indicating a preset voltage value to the first power supply module upon power-up. The output terminal of the first power supply module is connected to the input terminal of the processing module and is used to output a reference voltage to the input terminal of the processing module, thereby supplying power to the processing module.

[0009] The first terminal of the voltage divider module is connected to the input terminal of the processing module. The second terminal of the voltage divider module is connected to the feedback terminal of the first power supply module. The third terminal of the voltage divider module is used to input the first voltage. Here, the voltage value at the second terminal of the voltage divider module is positively correlated with the voltage value at the first terminal of the voltage divider module, and the voltage value at the second terminal of the voltage divider module is always between the voltage values ​​at the first terminal of the voltage divider module and the voltage values ​​at the third terminal of the voltage divider module. That is, when the voltage at the third terminal of the voltage divider module is greater than the voltage at the first terminal of the voltage divider module, we have: voltage at the third terminal of the voltage divider module > voltage at the second terminal of the voltage divider module > voltage at the first terminal of the voltage divider module.

[0010] Since the first terminal of the voltage divider module is connected to the input terminal of the processing module, the voltage at the first terminal of the voltage divider module is equal to the voltage at the input terminal of the processing module. Since the second terminal of the voltage divider module is connected to the feedback terminal of the first power supply module, the voltage at the second terminal of the voltage divider module is equal to the voltage at the feedback terminal of the first power supply module. The voltage at the third terminal of the voltage divider module is equal to the first voltage. Therefore, when the first voltage is greater than the voltage at the input terminal of the processing module, the following sequence applies: First voltage > Voltage at the feedback terminal of the first power supply module > Voltage at the input terminal of the processing module.

[0011] The first power module is used to adjust the reference voltage output to the input terminal of the processing module based on the voltage at the feedback terminal of the first power module, so that the voltage value at the feedback terminal of the first power module is equal to a preset voltage value. Therefore, in this embodiment, when the first voltage is greater than the voltage at the input terminal of the processing module, when the voltage value at the feedback terminal of the first power module is equal to the preset voltage value, the voltage value at the input terminal of the processing module is less than the preset voltage value. This reduces the reference voltage input to the processing module, thereby reducing energy waste, improving the battery life of the electronic device, and enhancing the user experience.

[0012] The power supply circuit provided in this application embodiment can also be used to raise the reference voltage. Specifically, when the voltage value at the third terminal of the voltage divider module is less than the voltage value at the first terminal of the voltage divider module, the following applies: voltage at the third terminal of the voltage divider module < voltage at the second terminal of the voltage divider module < voltage at the first terminal of the voltage divider module. That is, when the first voltage is less than the voltage at the input terminal of the processing module, the following applies: first voltage < voltage at the feedback terminal of the first power supply module < voltage at the input terminal of the processing module. In this case, when the voltage value at the feedback terminal of the first power supply module is equal to a preset voltage value, the voltage value at the input terminal of the processing module is greater than the preset voltage value. Thus, the reference voltage input to the input terminal of the processing module can be raised.

[0013] The circuit structure of the power supply circuit provided in the embodiments of this application will be explained in detail below.

[0014] In some embodiments, the voltage divider module includes a first resistor and a second resistor. A first end of the first resistor is connected to the input terminal of the processing module, and a second end of the first resistor is connected to the first end of the second resistor and the feedback terminal of the first power module. The second end of the second resistor is used to input a first voltage.

[0015] Generally, the resistance of the first resistor is much smaller than that of the second resistor. This allows the voltage at the feedback terminal of the first power module to be closer to the voltage at the input terminal of the processing module, meaning the reference voltage input to the processing module is close to a preset voltage value. This prevents the reference voltage from deviating significantly from the preset value, which could affect system stability. In some specific embodiments, the resistance of the first resistor is greater than or equal to 10 ohms and less than or equal to 100 ohms. For example, the resistance of the first resistor can be 10 ohms, 50 ohms, or 100 ohms. The resistance of the second resistor is greater than or equal to 1 kiloohms. For example, the resistance of the second resistor can be 1 kiloohms, 1.5 kiloohms, 5 kiloohms, or 10 kiloohms.

[0016] In some embodiments, the power supply circuit further includes a second power module. The input terminal of the second power module is used to input a second voltage. The output terminal of the second power module is connected to the third terminal of the voltage divider module to output a first voltage to the third terminal of the voltage divider module. That is, the second power module is used to convert the second voltage into a first voltage and output the first voltage to the third terminal of the voltage divider module.

[0017] In some specific embodiments, the second power supply module includes a linear regulator. In other embodiments, the second power supply module may also be a DC-DC converter, etc.

[0018] In some embodiments, the power supply circuit further includes a first switching module. A first terminal of the first switching module is used to input a second voltage, and a second terminal of the first switching module is connected to the input terminal of the second power supply module. That is, by controlling the on and off states of the first switching module, the input of the second voltage to the second power supply module can be controlled.

[0019] In some specific embodiments, the first switching module includes a first transistor and a third resistor. The first terminal of the first transistor is used to input a second voltage, and the second terminal of the first transistor is connected to the input terminal of the second power supply module. The first terminal of the third resistor is connected to the first terminal of the first transistor, and the second terminal of the third resistor is connected to the control terminal of the first transistor.

[0020] Furthermore, the first transistor can be a P-type transistor that is turned on at low levels and turned off at high levels. Based on this, the first switching module may further include a second transistor and a fourth resistor. The first terminal of the second transistor is connected to the control terminal of the first transistor, and the second terminal of the second transistor is connected to ground. The second transistor is an N-type transistor that is turned off at low levels and turned on at high levels. The first terminal of the fourth resistor is connected to the second terminal of the second transistor, and the second terminal of the fourth resistor is connected to the control terminal of the second transistor.

[0021] In some embodiments, the power supply circuit further includes a first capacitor. The first capacitor is a voltage regulator capacitor. The first plate of the first capacitor is connected to the first terminal of the first switching module, and the second plate of the first capacitor is connected to ground. Here, the first capacitor is also connected to the input terminal of the second power module through the first switching module. This ensures that when the first switching module is turned off, the input terminal of the second power module immediately enters a floating state, unaffected by the first capacitor.

[0022] In some embodiments, the power supply circuit further includes a second capacitor. The second capacitor is a voltage regulator capacitor. The first plate of the second capacitor is connected to the output terminal of the second power module, and the second plate of the second capacitor is connected to ground.

[0023] In some embodiments, the power supply circuit further includes a second switching module. A first terminal of the second switching module is connected to the output terminal of the second power module, and a second terminal of the second switching module is connected to the third terminal of the voltage divider module. The function of the second switching module is to disconnect the path between the output terminal of the second power module and the third terminal of the voltage divider module. Thus, when the second power module is not operating and the second switching module is turned off, a path cannot be formed between the third terminal of the voltage divider module and the ground wire connected to the output terminal of the second power module, thereby preventing energy waste.

[0024] In some specific embodiments, the second switching module includes a third transistor and a fifth resistor. The first terminal of the third transistor is connected to the output terminal of the second power supply module, and the second terminal of the third transistor is connected to the third terminal of the voltage divider module. The first terminal of the fifth resistor is connected to the first terminal of the third transistor, and the second terminal of the fifth resistor is connected to the control terminal of the third transistor.

[0025] In some embodiments, the output terminal of the first power module includes multiple sub-ports. The power supply circuit further includes multiple inductors. Each inductor corresponds one-to-one with a sub-port. The first end of any one of the multiple inductors is connected to the corresponding sub-port, and the second end of each of the multiple inductors is connected to the input terminal of the processing module. Thus, the first power module can supply power to the processing module through multiple inductors.

[0026] In some embodiments, the power supply circuit further includes a power distribution network. A first end of the power distribution network is connected to the output end of the first power module, and a second end of the power distribution network is connected to the input end of the processing module. The first power module supplies power to the processing module through the power distribution network.

[0027] In a second aspect, an electronic device is provided, including a power supply circuit as described in any of the first aspects.

[0028] It is understandable that the beneficial effects of the second aspect mentioned above can be found in the relevant descriptions in the first aspect mentioned above, and will not be repeated here. Attached Figure Description

[0029] Figure 1 is a schematic diagram of the appearance of the first electronic device in the related art;

[0030] Figure 2 is a schematic diagram of the appearance of the second type of electronic device in the related technology;

[0031] Figure 3 is a circuit structure diagram of the first power supply circuit in the related technology;

[0032] Figure 4 is a circuit diagram of the second power supply circuit in the related technology;

[0033] Figure 5 is a waveform diagram of the actual voltage input to the first processing module in the related technology;

[0034] Figure 6 is a waveform diagram of the actual voltage input to the second processing module in the related technology;

[0035] Figure 7 is a waveform diagram of the actual voltage input to the post-processing module after the reference voltage is lowered in the related technology;

[0036] Figure 8 is a voltage comparison diagram before and after the reference voltage is lowered in the relevant technology;

[0037] Figure 9 is a circuit structure diagram of the first power supply circuit provided in the embodiment of this application;

[0038] Figure 10 is a circuit structure diagram of the second power supply circuit provided in the embodiment of this application;

[0039] Figure 11 is a current direction diagram of the first power supply circuit provided in the embodiment of this application;

[0040] Figure 12 is a current direction diagram of a second power supply circuit provided in an embodiment of this application;

[0041] Figure 13 is a circuit structure diagram of the third power supply circuit provided in the embodiment of this application;

[0042] Figure 14 is a circuit structure diagram of the fourth power supply circuit provided in the embodiment of this application;

[0043] Figure 15 is an equivalent circuit diagram of a power supply circuit provided in an embodiment of this application;

[0044] Figure 16 is a circuit structure diagram of the fifth power supply circuit provided in the embodiment of this application;

[0045] Figure 17 is a circuit structure diagram of the first type of first switch module provided in the embodiment of this application;

[0046] Figure 18 is a circuit structure diagram of the second type of first switch module provided in the embodiment of this application;

[0047] Figure 19 is a circuit structure diagram of the sixth power supply circuit provided in the embodiment of this application;

[0048] Figure 20 is a circuit structure diagram of the seventh power supply circuit provided in the embodiment of this application;

[0049] Figure 21 is a circuit structure diagram of the eighth power supply circuit provided in the embodiment of this application;

[0050] Figure 22 is a circuit structure diagram of the first type of second switch module provided in the embodiment of this application;

[0051] Figure 23 is a circuit structure diagram of the second type of second switch module provided in the embodiment of this application;

[0052] Figure 24 is a circuit structure diagram of the ninth power supply circuit provided in the embodiment of this application;

[0053] Figure 25 is a circuit structure diagram of the tenth power supply circuit provided in the embodiment of this application.

[0054] The meanings of the reference numerals in the related technologies are as follows: 10, electronic device; 100, power supply circuit; 110, processing module; 120, power module;

[0055] The reference numerals in the embodiments of this application represent the following meanings: 20, power supply circuit; 210, processing module; 220, first power supply module; 230, voltage divider module; 240, second power supply module; 250, first switch module; 252, first switch unit; 254, first level conversion unit; 260, second switch module; 262, second switch unit; 264, second level conversion unit. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0057] It should be understood that "multiple" as mentioned in this application refers to two or more. In the description of this application, unless otherwise stated, " / " indicates "or," for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist, for example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, to facilitate a clear description of the technical solutions of this application, the terms "first," "second," etc., are used to distinguish identical or similar items with essentially the same function and effect. Those skilled in the art will understand that the terms "first," "second," etc., do not limit the quantity or execution order, and that "first," "second," etc., do not necessarily imply differences.

[0058] Before providing a detailed explanation of the power supply circuit provided in the embodiments of this application, the application scenarios and related technologies of the power supply circuit will be explained first.

[0059] Electronic devices 10 include mobile phones, tablets, laptops, televisions, wearable devices, etc. Figures 1 and 2 are schematic diagrams of the appearance of two different electronic devices 10 in the related art. Figure 1 shows a laptop computer, and Figure 2 shows a mobile phone. Generally, electronic devices 10 have a processor. The processor can operate when powered on, and it can process data when operating. For example, in electronic devices 10 such as mobile phones, tablets, and wearable devices, the processor is generally a system-on-a-chip (SOC). An SOC includes a central processing unit (CPU), a graphics processing unit (GPU), a baseband processor, etc., integrated together. In electronic devices 10 such as laptops and televisions, the processor includes a CPU, GPU, etc., which are separately configured and connected together.

[0060] Taking a mobile phone as an example and a System-on-a-Chip (SOC) as its processor, an SOC typically has multiple processor cores (hereinafter referred to as cores). For example, the multiple cores of an SOC may include performance cores, efficiency cores, counter register cores, memory cores, and display cores. Performance cores are also called large cores, and efficiency cores are also called small cores. Counter register cores are used as counters in instructions such as loops and string operations. Memory cores are used for data storage. Display cores are used for image processing. Analysis of the mobile phone's power consumption model reveals that the SOC accounts for approximately 45% of the total power consumption of the entire electronic device 10; and within the mobile phone's SOC, the power consumption of performance cores, efficiency cores, counter register cores, memory cores, and display cores accounts for approximately 80% of the SOC's power consumption. Therefore, reducing the power consumption of each core in the SOC is crucial for reducing the mobile phone's power consumption and improving its battery life. Research has shown that if the average power consumption of each core in a System-on-a-Chip (SoC)—its performance core, energy efficiency core, counter register core, storage core, and display core—is reduced by 5%, the SoC's power consumption can be reduced by at least 4%, which can improve the phone's battery life by 2% to 3%.

[0061] Understandably, for any core in a System-on-a-Chip (SoC), the power consumption of that core can be calculated using the following formula: P = f·C·V 2 .

[0062] Where p is the power consumption of the core, f is the operating frequency of the core (e.g., f can be equal to 3 GHz or 2.5 GHz), C is the equivalent capacitance of the core, and V is the actual input voltage when the core is operating.

[0063] Therefore, by reducing the actual input voltage of the cores in the SOC during operation, the power consumption of the cores can be reduced, thereby improving the battery life of the mobile phone.

[0064] Similarly, when the electronic device 10 is a laptop, television, etc., and the processor of the electronic device 10 is a CPU, GPU, etc., the CPU and GPU also include multiple cores. In this case, reducing the actual input voltage of the cores in the CPU and GPU when they are working can also reduce the power consumption of the cores, thereby reducing the power consumption of the CPU and achieving the goal of reducing the power consumption of the electronic device 10.

[0065] The feasibility of "reducing the actual input voltage when a core in a SOC (or CPU, GPU, etc.) is working" is described below. For ease of understanding, in the following description, "core" will be referred to as the processing module of electronic device 10. That is, the processing module can be any core in a SOC, or any core in a CPU, GPU, etc.

[0066] The electronic device 10 includes a power supply circuit 100, which comprises a processing module 110. Figure 3 is a circuit structure diagram of a power supply circuit 100 in the related art. As shown in Figure 3, the power supply circuit 100 also includes a power supply module 120. The communication terminal a of the processing module 110 is connected to the communication terminal c of the power supply module 120. The output terminal d of the power supply module 120 is connected to the input terminal b of the processing module 110. The feedback terminal e of the power supply module 120 is connected to the input terminal b of the processing module 110.

[0067] The operation of the processing module 110 is as follows: When powered on, the processing module 110 transmits a preset voltage value to the power module 120 through communication terminal a. The input terminal b of the processing module 110 is used to input electrical energy.

[0068] The power supply module 120 operates as follows: When it receives a preset voltage value, the power supply module 120 outputs electrical energy from its output terminal d to the input terminal b of the processing module 110, thereby supplying power to the processing module 110. Simultaneously, the feedback terminal e of the power supply module 120 can also detect the reference voltage input to the input terminal b of the processing module 110. The power supply module 120 is used to ensure that the voltage value at the feedback terminal e equals the preset voltage value. In related technologies, this ensures that the reference voltage input to the processing module 110 equals the preset voltage value.

[0069] Generally, as shown in Figure 4, the power module 120 internally includes resistors Ra and Rb connected in series. Resistors Ra and Rb are voltage divider sampling resistors, and are connected in series between the feedback terminal e and ground. For ease of description, the node connecting resistors Ra and Rb is referred to as node A. When the power module 120 is operating, it can detect the voltage value at node A and obtain the voltage value at the feedback terminal e based on the voltage value at node A and the ratio of the resistance values ​​of resistors Ra and Rb.

[0070] In related technologies, the actual voltage input to the processing module 110 fluctuates continuously around a reference voltage during operation. This is because, as shown in Figure 4, the output terminal d of the power module 120 and the input terminal b of the processing module 110 are connected via a power delivery network (PDN). The PDN has a certain impedance. When the processing module 110 operates, it draws current, and this current is an alternating current with a non-constant value related to its operating frequency. Therefore, according to Ohm's law, during the positive half-cycle of this alternating current, the actual voltage input to the processing module 110 will be greater than the reference voltage; during the negative half-cycle, the actual voltage input to the processing module 110 will be less than the reference voltage. The amplitude of the actual voltage input to the processing module 110 relative to the reference voltage is related to the impedance during power transmission. This impedance refers to the PDN impedance. In this case, the waveform of the actual voltage input to the processing module 110 can be shown in Figure 5. In the embodiment shown in Figure 5, Vdd1 represents a preset voltage value, which is the value of the reference voltage in related technologies.

[0071] Based on this, the processing module 110 also includes a first voltage threshold Vth1 and a second voltage threshold Vth2. Generally, the second voltage threshold Vth2 is greater than a preset voltage value Vdd1, and the preset voltage value Vdd1 is greater than the first voltage threshold Vth1. For the processing module 110 to operate normally, the following condition must be met: the actual voltage input to input terminal b must always be between the first voltage threshold Vth1 and the second voltage threshold Vth2. When the actual voltage input to the processing module 110 is less than the first voltage threshold Vth1, it may cause the actual voltage input to the processing module 110 to be too low and unable to work, thus causing the electronic device 10 to crash. Therefore, the function of the first voltage threshold Vth1 is to limit the minimum value of the actual voltage input to the processing module 110. When the actual voltage input to the processing module 110 is greater than the second voltage threshold Vth2, it may cause damage to the processing module 110. Therefore, the function of the second voltage threshold Vth2 is to limit the maximum value of the actual voltage input to the processing module 110. In related technologies, considering that the PDN impedance may be large, that is, the amplitude of the actual voltage input to the processing module 110 is relatively large compared with the reference voltage, and in order to ensure that the actual voltage input to the processing module 110 is always between the first voltage threshold Vth1 and the second voltage threshold Vth2, the reference voltage is usually a large voltage, that is, the preset voltage value Vdd1 is large.

[0072] However, when the PDN impedance is optimized to be smaller, the waveform of the actual voltage input to the processing module 110 changes from Figure 5 to Figure 6. As shown in Figure 6, when the PDN impedance is smaller, the minimum value of the actual voltage input to the processing module 110 is much greater than the first voltage threshold Vth1. As described above, when the processing module 110 is working, the actual voltage input only needs to remain constant between the first voltage threshold Vth1 and the second voltage threshold Vth2. Therefore, in this case, the reference voltage can be lowered to reduce its value to Vdd2. After lowering the reference voltage, the waveform of the actual voltage input to the processing module 110 is shown in Figure 7. As shown in Figure 7, after lowering the reference voltage, the actual voltage input to the processing module 110 still ensures normal operation of the processing module 110. Figure 8 shows a voltage comparison before and after lowering the reference voltage. As shown in Figures 6 to 8, when the PDN impedance is optimized, the actual voltage input to the processing module 110 can be reduced by lowering the reference voltage, thereby reducing the power consumption of the processing module 110 and improving the battery life of the electronic device 10.

[0073] As is easily understood, a PDN typically consists of electronic components such as wires, capacitors, and inductors. Therefore, by optimizing the routing of wires, the connection methods of various electronic components, and the materials used in each electronic component, the PDN can be optimized, and its impedance reduced. In fact, related technologies have already achieved significant optimization of PDN impedance. For example, Table 1 below shows simulation data before and after impedance optimization for the PDNs connected to different processing modules 110 in related technologies.

[0074] Table 1

[0075] In this table, NO1, NO2, NO3, NO4, and NO5 are the numbers of different processing modules 110. Processing module 110 numbered NO1 is a performance core; processing module 110 numbered NO2 is an energy efficiency core; processing module 110 numbered NO3 is a counting register core; processing module 110 numbered NO4 is a storage core; and processing module 110 numbered NO5 is a display core. "Low frequency," "medium frequency," and "high frequency" refer to the operating frequencies of processing modules 110. The impedance units are all the same, and all are mΩ (milliohms). As shown in Table 1, the PDN impedance can be well optimized in related technologies. Therefore, if the reference voltage can be lowered, the power consumption of processing module 110 can be reduced, and the battery life of electronic device 10 can be improved.

[0076] In related technologies, a common approach to reducing the reference voltage input to the processing module 110 is to decrease the preset voltage value Vdd1, for example, by reducing Vdd1 to Vdd2. However, changing the preset voltage value Vdd1 requires modifying the underlying code of the processing module 110. Since the underlying code of the processing module 110 cannot be modified, the preset voltage value Vdd1 cannot be adjusted in related technologies, thus preventing the reduction of the reference voltage input to the processing module 110. This results in wasted power and negatively impacts the battery life of the electronic device 10.

[0077] Therefore, embodiments of this application provide a power supply circuit and electronic device that can lower the reference voltage input to the input terminal of the processing module, thereby reducing power waste, improving the battery life of the electronic device, and thus enhancing the user experience.

[0078] The power supply circuit provided in the embodiments of this application will be explained in detail below. In the embodiments of this application, the connection between two electrical modules / electronic devices includes communication connection and electrical connection. Here, communication connection refers to a connection capable of transmitting communication signals. The communication signal can be an electrical signal or an optical signal, and is not limited here. Electrical connection refers to a connection capable of transmitting electrical signals. Electrical connection includes direct connection and indirect connection. For example, a direct connection between device A and device B means that device A and device B are connected by a wire to transmit electrical signals. An indirect connection between device A and device B means that the first end of device A and device C are connected by a wire, and the second end of device C and device B are connected by a wire, so that device A and device B can transmit electrical signals through device C. For ease of understanding, in the following description, "electrical connection" will be simply referred to as connection.

[0079] The power supply circuit 20 is applied to electronic devices, such as the electronic devices shown in Figure 1 or Figure 2. Figure 9 is a circuit structure diagram of a power supply circuit 20 provided in an embodiment of this application. As shown in Figure 9, the power supply circuit 20 includes a processing module 210, a first power supply module 220, and a voltage divider module 230.

[0080] Electronic devices include processors. For example, when an electronic device is a mobile terminal such as a mobile phone, tablet, or wearable device, the processor can be a System-on-a-Chip (SoC). When an electronic device is a personal computer (PC), television, server, or similar device, the processor can be a CPU, GPU, etc. Processors generally have multiple cores, and different cores can have the same or different operating frequencies and functions. Here, processing module 210 can be any one of the cores in the processor. Processing module 210 has a communication terminal a and an input terminal b. Communication terminal a of processing module 210 is used to transmit communication signals. Input terminal b of processing module 210, also called the power supply terminal, is used to input electrical energy so that processing module 210 can be powered on and operate. When processing module 210 is operating, it performs its data processing functions.

[0081] The first power module 220 is a device used for DC-DC voltage conversion in an electronic device. For example, the first power module 220 can be a power management integrated circuit (PMIC) or a voltage regulator module (VRM). The first power module 220 has a communication terminal c, an output terminal d, and a feedback terminal e. The communication terminal c of the first power module 220 is communicatively connected to the communication terminal a of the processing module 210 for transmitting communication signals. For example, the communication terminal c of the first power module 220 and the communication terminal a of the processing module 210 can be connected via at least one of an inter-integrated circuit (I2C) bus, a serial peripheral management interface (SPMI) bus, a serial voltage identification (SVID) bus, or a serial peripheral interface (SPI) bus to achieve communication signal transmission. The output terminal d of the first power module 220 is connected to the input terminal b of the processing module 210 for supplying power to the processing module 210.

[0082] The voltage divider module 230 has a first terminal 1, a second terminal 2, and a third terminal 3. The first terminal 1 of the voltage divider module 230 is connected to the input terminal b of the processing module 210, so that the voltage at the first terminal 1 of the voltage divider module 230 is equal to the voltage at the input terminal b of the processing module 210. The second terminal 2 of the voltage divider module 230 is connected to the feedback terminal e of the first power supply module 220, so that the voltage at the second terminal 2 of the voltage divider module 230 is equal to the voltage at the feedback terminal e of the first power supply module 220. The third terminal 3 of the voltage divider module 230 is used to connect to a first voltage terminal. The first voltage terminal is used to output a first voltage VA. That is, the third terminal 3 of the voltage divider module 230 is used to input the first voltage VA, so that the voltage at the third terminal 3 of the voltage divider module 230 is equal to the first voltage VA.

[0083] For ease of understanding, the voltage at the first terminal of voltage divider module 230 is referred to as V1; the voltage at input terminal b of processing module 210 is referred to as Vb; the voltage at the second terminal 2 of voltage divider module 230 is referred to as V2; the voltage at feedback terminal e of first power supply module 220 is referred to as Ve; and the voltage at the third terminal 3 of voltage divider module 230 is referred to as V3. Then:

[0084] V1=Vb; V2=Ve; V3=VA...①.

[0085] Here, the voltage divider module 230 also has the following characteristics: the voltage value at the second terminal 2 of the voltage divider module 230 is positively correlated with the voltage value at the first terminal 1 of the voltage divider module 230; and the voltage value at the second terminal 2 of the voltage divider module 230 is always between the voltage value at the first terminal 1 of the voltage divider module 230 and the voltage value at the third terminal 3 of the voltage divider module 230. That is to say:

[0086] V2∝V1.

[0087] When V3 > V1, V3 > V2 > V1……②.

[0088] When V3 < V1, V3 < V2 < V1……③.

[0089] Combining formulas ① and ② above, we can obtain:

[0090] When VA > Vb, VA = V3 > V2 = Ve > V1 = Vb……④.

[0091] Combining formulas ① and ③ above, we can obtain:

[0092] When VA < Vb, VA = V3 < V2 = Ve < V1 = Vb ... ⑤.

[0093] In this embodiment, the processing module 210 operates as follows: upon power-up, the processing module 210 transmits a first communication signal to the first power module 220 via communication terminal a. The first communication signal indicates a preset voltage value, i.e., the first communication signal contains the preset voltage value. The input terminal b of the processing module 210 is used to input electrical energy. The first power module 220 operates as follows: upon receiving the preset voltage value, the first power module 220 outputs a reference voltage from its output terminal d to the input terminal b of the processing module 210, thereby supplying power to the processing module 210; during the process of supplying power to the processing module 210, the reference voltage output to the input terminal b of the processing module 210 is adjusted according to the voltage at the feedback terminal e of the first power module 220, so that the voltage value at the feedback terminal e of the first power module 220 is equal to the preset voltage value.

[0094] In this context, the power-on of processing module 210 and the input power to its input terminal b are not the same. Powering on processing module 210 means that other ports (not shown) of processing module 210 are energized, preparing processing module 210 to begin operation. Generally, after powering on, processing module 210 can perform a series of initialization operations, such as checking hardware status and loading program code. In some specific embodiments, processing module 210 can be powered on when the electronic device is turned on. The input power to input terminal b of processing module 210 means that the output terminal d of the first power module 220 supplies power to input terminal b of processing module 210. After input power is received at input terminal b of processing module 210, it can perform data processing at the operating frequency. It is understood that the embodiments of this application do not involve improvements to processing module 210 compared to the prior art. Therefore, the preset voltage value in the embodiments of this application is equal to the preset voltage value in the related art; the working process of processing module 210 in the embodiments of this application is also the same as the working process of processing module 210 in the related art.

[0095] The reference voltage refers to the voltage at input terminal b of processing module 210 when the output terminal d of the first power module 220 supplies power to the input terminal b of processing module 210, and processing module 210 is not performing AC power withdrawal. It is understood that the amplitude of the actual voltage input to processing module 210 when performing AC power withdrawal is very small compared to the reference voltage value. For example, the reference voltage value may be 1V, while the amplitude of the actual voltage relative to the reference voltage may be 10mV. Adjusting the output voltage at output terminal d of the first power module 220 achieves the purpose of adjusting the reference voltage at input terminal b of processing module 210. It is understood that the embodiments of this application do not involve improvements to the power module 120 compared to the prior art. Therefore, the working process of the first power module 220 in the embodiments of this application is the same as the working process of the power module 120 in related technologies.

[0096] In this embodiment, when the first power module 220 adjusts the reference voltage output to the input terminal b of the processing module 210 according to the voltage at the feedback terminal e, the voltage value at the feedback terminal e of the first power module 220 is ultimately equal to a preset voltage value. Combining this with the above formula ④, it can be seen that when the first voltage VA is greater than the voltage at the input terminal b of the processing module 210, the following will occur:

[0097] VA = V3 > V2 = Ve = preset voltage value > V1 = Vb. That is, when the voltage at the feedback terminal e of the first power module 220 equals the preset voltage value, the voltage at the input terminal b of the processing module 210 is less than the preset voltage value. Thus, by setting the voltage divider module 230, the reference voltage input to the input terminal b of the processing module 210 can be reduced, thereby reducing energy waste, improving the battery life of electronic devices, and ultimately enhancing the user experience.

[0098] As understood from the foregoing description, the voltage at input terminal b of processing module 210 fluctuates during operation. Therefore, when it is necessary to reduce the reference voltage input to input terminal b of processing module 210, the first voltage VA should be set to be consistently greater than the voltage at input terminal b of processing module 210. For example, if the reference voltage is 1V before reduction, and the amplitude of the actual voltage input to processing module 210 relative to the reference voltage is 10mV, then the first voltage VA can be set to 2V or 3V. In this way, the first voltage VA will be consistently greater than the voltage at input terminal b of processing module 210, thereby reducing the reference voltage value to less than 1V.

[0099] In some other embodiments, the power supply circuit 20 can also be used to raise the reference voltage.

[0100] Specifically, in this embodiment, when the first power module 220 adjusts the reference voltage output to the input terminal b of the processing module 210 according to the voltage at the feedback terminal e, it ultimately makes the voltage value at the feedback terminal e of the first power module 220 equal to a preset voltage value. Combining this with the above formula ⑤, we can obtain that when the first voltage VA is less than the voltage at the input terminal b of the processing module 210, the following will occur:

[0101] VA = V3 < V2 = Ve = preset voltage value < V1 = Vb. That is, when the voltage at the feedback terminal e of the first power module 220 equals the preset voltage value, the voltage at the input terminal b of the processing module 210 is greater than the preset voltage value. Thus, by setting the voltage divider module 230, the reference voltage input to the input terminal b of the processing module 210 can be raised. For the processing module 210, which cannot operate due to the actual voltage input to the input terminal b being less than the first voltage threshold Vth1, raising the reference voltage ensures the normal operation of the processing module 210, preventing the electronic equipment used in the power supply circuit 20 from crashing, thereby improving the user experience.

[0102] Therefore, the power supply circuit 20 provided in this embodiment can reduce the reference voltage input to the input terminal b of the processing module 210 when the first voltage VA input to the third terminal 3 of the voltage divider module 230 is greater than the voltage input to the input terminal b of the processing module 210. Conversely, it can increase the reference voltage input to the input terminal b of the processing module 210 when the first voltage VA input to the third terminal 3 of the voltage divider module 230 is less than the voltage input to the input terminal b of the processing module 210.

[0103] Figure 10 is a circuit structure diagram of another power supply circuit 20 provided in an embodiment of this application. As shown in Figure 10, in some embodiments, the power supply circuit 20 further includes a PDN.

[0104] The power distribution network (PDN) is used to distribute the electrical energy output from the output terminal d of the first power module 220 to other electrical components (such as the processing module 210) in the electronic device. The PDN can be composed of electronic components such as wires, capacitors, and inductors. Here, the PDN has a first terminal and a second terminal. The first terminal of the PDN is connected to the output terminal d of the first power module 220, and the second terminal of the PDN is connected to the input terminal b of the processing module 210. The first power module 220 supplies power to the processing module 210 through the PDN.

[0105] The circuit structure of the power supply circuit 20 provided in the embodiments of this application will be explained in detail below with reference to the accompanying drawings.

[0106] I. Circuit structure of voltage divider module 230.

[0107] As shown in Figure 10, the voltage divider module 230 includes a first resistor R1 and a second resistor R2. The first end of the first resistor R1 is connected to the input terminal b of the processing module 210. That is, the first end of the first resistor R1 is the first terminal 1 of the voltage divider module 230. The second end of the first resistor R1 is connected to the first end of the second resistor R2 and the feedback terminal e of the first power supply module 220. That is, the second end of the first resistor R1 and the first end of the second resistor R2 form the second terminal 2 of the voltage divider module 230. The second end of the second resistor R2 is used to input the first voltage VA. That is, the second end of the second resistor R2 is the third terminal 3 of the voltage divider module 230.

[0108] It is understood that in some other embodiments not shown, the first resistor R1 and the second resistor R2 can both be formed by one or more resistors connected in series or in parallel. Here, "multiple" refers to two or more integers. It is also understood that in some other embodiments, the voltage divider module 230 may include capacitors, inductors, and other devices.

[0109] In this embodiment, the resistance value of the first resistor R1 can be set to be much smaller than the resistance value of the second resistor R2. The purpose of this setting is to make the voltage at the feedback terminal e of the first power module 220 closer to the voltage at the input terminal b of the processing module 210. Since the voltage at the feedback terminal e is equal to a preset voltage value when the first power module 220 is working, this means that the reference voltage input to the input terminal b of the processing module 210 is close to the preset voltage value. This avoids the reference voltage value deviating too much from the preset voltage value, which could affect system stability. The following analysis explains this in two specific cases.

[0110] 1. First case: The first voltage VA is greater than the voltage at the input terminal b of the processing module 210, that is, VA > Vb.

[0111] Figure 11 is a current direction diagram of a power supply circuit 20 provided in an embodiment of this application, showing the current direction in the power supply circuit 20 when VA > Vb. In this case, V3 > V2 > V1, and V2 can be calculated by the following formula:

[0112] Where I1 is the current value of the first resistor R1; R1 is the resistance value of the first resistor R1; and R2 is the resistance value of the second resistor R2. The relationship between V1 and V2 will be explained below through an example.

[0113] (1) In the first example, the resistance of the first resistor R1 is 100Ω (ohms), and the resistance of the second resistor R2 is 10KΩ (kiloohms), which meets the requirement that the resistance of the first resistor R1 is much smaller than the resistance of the second resistor R2. In this example, assuming the voltage at input terminal b of processing module 210 is 1V and the first voltage VA is 3V, then: V1 = Vb = 1V, V3 = VA = 3V. According to the above formula, the voltage at the second terminal 2 of voltage divider module 230 is:

[0114] Therefore, the voltage at the feedback terminal e of the first power module 220 is 1.0198V, while the voltage at the input terminal b of the processing module 210 is 1V. Consequently, the voltage at the feedback terminal e of the first power module 220 is 19.8mV higher than the voltage at the input terminal b of the processing module 210, meaning the reference voltage is reduced by 19.8mV. The voltage at the feedback terminal e of the first power module 220 is closer to the voltage at the input terminal b of the processing module 210.

[0115] (2) In the second example, the resistance of the first resistor R1 is 100Ω, and the resistance of the second resistor R2 is 10KΩ. This meets the requirement that the resistance of the first resistor R1 is much smaller than the resistance of the second resistor R2. In this example, assuming the preset voltage is 1V and the first voltage VA is 3V, then: Ve = V2 = 1V, V3 = VA = 3V. According to the above formula, we can obtain the following:

[0116] Therefore, V1 = 0.98V.

[0117] Therefore, when the voltage at the feedback terminal e of the first power module 220 is 1V, the voltage at the input terminal b of the processing module 210 is 0.98V. Thus, the voltage at the feedback terminal e of the first power module 220 is 20mV higher than the voltage at the input terminal b of the processing module 210, meaning the reference voltage is reduced by 20mV. The voltage at the feedback terminal e of the first power module 220 is closer to the voltage at the input terminal b of the processing module 210.

[0118] 2. Second case: The first voltage VA is less than the voltage at input terminal b of processing module 210, that is, VA < Vb.

[0119] Figure 12 is a current direction diagram of another power supply circuit 20 provided in an embodiment of this application, showing the current direction in the power supply circuit 20 when VA < Vb. In this case, V3 < V2 < V1, and V2 can be calculated by the following formula:

[0120] The following example illustrates the relationship between the sizes of V1 and V2.

[0121] (1) In the first example, the resistance of the first resistor R1 is 100Ω, and the resistance of the second resistor R2 is 10KΩ. This meets the requirement that the resistance of the first resistor R1 is much smaller than the resistance of the second resistor R2. In this example, assuming the voltage at input terminal b of processing module 210 is 1V and the first voltage VA is 0.5V, then: V1 = Vb = 1V, V3 = VA = 0.5V. According to the above formula, the voltage at the second terminal 2 of voltage divider module 230 is:

[0122] Therefore, the voltage at the feedback terminal e of the first power module 220 is 0.99505V, or 995.05mV, while the voltage at the input terminal b of the processing module 210 is 1V. Thus, the voltage at the feedback terminal e of the first power module 220 is 4.95mV lower than the voltage at the input terminal b of the processing module 210, meaning the reference voltage is raised by 4.95mV. The voltage at the feedback terminal e of the first power module 220 is closer to the voltage at the input terminal b of the processing module 210.

[0123] (2) In the second example, the resistance of the first resistor R1 is 100Ω, and the resistance of the second resistor R2 is 10KΩ. This meets the requirement that the resistance of the first resistor R1 is much smaller than the resistance of the second resistor R2. In this example, assuming the preset voltage is 1V and the first voltage VA is 0.5V, then: Ve = V2 = 1V, V3 = VA = 0.5V. According to the above formula, we can obtain the following:

[0124] Therefore, V1 = 1.005.

[0125] Therefore, when the voltage at the feedback terminal e of the first power module 220 is 1V, the voltage at the input terminal b of the processing module 210 is 1.005V. Thus, the voltage at the feedback terminal e of the first power module 220 is 5mV lower than the voltage at the input terminal b of the processing module 210, meaning the reference voltage is raised by 5mV. The voltage at the feedback terminal e of the first power module 220 is closer to the voltage at the input terminal b of the processing module 210.

[0126] Based on the above analysis and examples, it can be seen that the value by which the reference voltage is lowered or raised is related to the resistance values ​​of the first resistor R1, the second resistor R2, and the first voltage VA. In some specific embodiments, the resistance value of the first resistor R1 is greater than or equal to 10Ω, and less than or equal to 100Ω. For example, the resistance value of the first resistor R1 can be 10Ω, 50Ω, or 100Ω. The resistance value of the second resistor R2 is greater than or equal to 1KΩ. For example, the resistance value of the second resistor R2 can be 1KΩ, 1.5KΩ, 5KΩ, 10KΩ, or 20KΩ. In some preferred embodiments, the resistance value of the first resistor R1 is 50Ω, and the resistance value of the second resistor R2 is 10KΩ. The resistance values ​​of the first resistor R1, the second resistor R2, and the first voltage VA can be set by those skilled in the art based on experience and requirements.

[0127] II. Circuit structure of the second power supply module 240 used to provide the first voltage VA.

[0128] Figure 13 is a circuit structure diagram of another power supply circuit 20 provided in an embodiment of this application. As shown in Figure 13, in some embodiments, the power supply circuit 20 further includes a second power module 240.

[0129] The second power module 240 is a device used in electronic devices for DC-DC voltage conversion. The second power module 240 provides a first voltage VA. The second power module 240 has an input terminal f and an output terminal g. The input terminal f of the second power module 240 is used to input a second voltage VB. Here, the second voltage VB can be provided by an energy storage unit in the electronic device. When the electronic device is a mobile phone, tablet computer, or wearable device, the energy storage unit can be a battery cell in the electronic device; when the electronic device is a PC, etc., the energy storage unit can be a battery on board (BOB) in the electronic device. The output terminal g of the second power module 240 is connected to the third terminal 3 of the voltage divider module 230. The second power module 240 is used to convert the DC second voltage VB into the first voltage VA and provide the first voltage VA to the third terminal 3 of the voltage divider module 230.

[0130] In some specific embodiments, as shown in Figure 14, the second power module 240 can be a linear regulator. For example, the second power module 240 is a low dropout regulator (LDO), thereby providing a stable first voltage VA with low ripple to the third terminal 3 of the voltage divider module 230. When the second power module 240 is a linear regulator, it can also have an enable terminal h and a communication terminal i. The enable terminal h of the second power module 240 is also called the enable input terminal. When a high-level signal is input to the enable terminal h of the second power module 240, the second power module 240 enters the working state and can convert the second voltage VB into the first voltage VA. Conversely, when a low-level signal is input to the enable terminal h of the second power module 240, the second power module 240 enters the non-working state, and at this time, the second power module 240 cannot provide the first voltage VA to the third terminal 3 of the voltage divider module 230. The enable terminal h of the second power module 240 can be connected to the processing module 210 so that the processing module 210 can control whether the second power module 240 is working. Alternatively, the enable terminal of the second power module 240 can also be connected to other electronic devices with processing and control functions (such as the first power module 220) so that the other electronic devices can control whether the second power module 240 is working.

[0131] The communication terminal i of the second power module 240 can be communicatively connected to the communication terminal a of the processing module 210 to receive communication signals. Alternatively, the communication terminal i of the second power module 240 can also be connected to the communication terminal of other electronic devices with processing and control functions (such as the first power module 220) to receive communication signals. The communication connection can be, for example, at least one connection via an I2C bus, an SPMI bus, an SPI bus, etc. The communication signal received by the communication terminal i of the second power module 240 can be a second communication signal. The function of the second communication signal is to configure the second power module 240; for example, the second power module 240 can adjust the magnitude of the first voltage VA output at its output terminal g according to the second communication signal.

[0132] In some other embodiments not shown, the second power supply module 240 may also be a pulse width modulation (PWM) power supply. A PWM power supply is a power supply whose output voltage is controlled by a PWM signal. For example, a PWM power supply may be a buck DC-DC converter or a boost DC-DC converter. Alternatively, the second power supply module 240 may also be a programmable power supply.

[0133] III. Circuit structure of the first switch module 250 used to leave the input terminal f of the second power supply module 240 floating.

[0134] As described above, in this embodiment, the second power module 240 has two states: "operating" and "non-operating". When the second power module 240 is in the operating state, it can provide a first voltage VA to the third terminal 3 of the voltage divider module 230 to lower or raise the reference voltage input to the input terminal b of the processing module 210. Conversely, when the second power module 240 is in the non-operating state, it cannot provide the first voltage VA to the third terminal 3 of the voltage divider module 230, and the reference voltage input to the input terminal b of the processing module 210 is equal to a preset voltage value.

[0135] Taking the case where the first voltage VA is used to reduce the reference voltage input to input terminal b of processing module 210 as an example, in this embodiment, the power supply circuit 20 can control whether the second power module 240 is in a working state based on the power consumption of processing module 210. For example, when the electronic device is in a game scenario, the power consumption of processing module 210 is high. At this time, a high-level signal can be input to the enable terminal h of second power module 240 to make second power module 240 enter the working state, thereby reducing the reference voltage input to input terminal b of processing module 210. When the electronic device is in a standby scenario, the power consumption of processing module 210 is low. At this time, a low-level signal can be input to the enable terminal h of second power module 240 to make second power module 240 enter the non-working state. Similarly, when the first voltage VA is used to raise the reference voltage input to input terminal b of processing module 210, the second power module 240 can also be controlled to be in a working state based on the power consumption of processing module 210.

[0136] Figure 15 is an equivalent circuit diagram of a power supply circuit 20 provided in an embodiment of this application, wherein the impedance to ground of the output terminal g of the second power module 240 is equivalent to a resistor RG. Research has revealed that in related technologies, when a low-level signal is input to the enable terminal h of the second power module 240, the second power module 240 enters a non-operating state, and the input terminal f of the second power module 240 is floating, the impedance to ground of the output terminal g of the second power module 240 is high (approximately 200KΩ). "The input terminal f of the second power module 240 is floating" means that no voltage is input to the input terminal f of the second power module 240. However, when a low-level signal is input to the enable terminal h of the second power module 240, the second power module 240 enters a non-operating state, and a voltage is input to the input terminal f of the second power module 240, the impedance to ground of the output terminal g of the second power module 240 is low (approximately 100Ω to 500Ω). In this situation, on the one hand, a leakage path will be formed, starting from the input terminal b of the processing module 210, passing through the first resistor R1, the second resistor R2, the output terminal g of the second power module 240, and finally reaching the ground wire. This leakage path is shown in Figure 15. On the other hand, it will also cause the voltage at the feedback terminal e of the first power module 220 to be less than the voltage at the input terminal b of the processing module 210. In this case, when the voltage at the feedback terminal e of the first power module 220 is equal to the preset voltage value, the voltage at the input terminal b of the processing module 210 will be greater than the preset voltage value, that is, the reference voltage input to the input terminal b of the processing module 210 will be increased, resulting in wasted power.

[0137] Taking a first resistor R1 with a resistance of 100Ω, a second resistor R2 with a resistance of 10KΩ, a resistor RG with a low impedance of 500Ω, and a preset voltage of 1V as an example, we can obtain that when the voltage at the input terminal b of the processing module 210 is 1V, the voltage at the feedback terminal e of the first power supply module 220 is:

[0138] Among them, R G Let RG be the resistance value. That is, when the voltage at input terminal b of processing module 210 equals the preset voltage value, the voltage at feedback terminal e of first power module 220 is only about 990.6mV, which is 9.4mV less than the preset voltage value. In this case, first power module 220 will continue to increase the voltage output to input terminal b of processing module 210 until the voltage at feedback terminal e of first power module 220 is 1V. When the voltage at feedback terminal e of first power module 220 is 1V, the voltage at input terminal b of processing module 210 is:

[0139] We can obtain: V1=Vb≈1.0095.

[0140] In other words, when the voltage at the feedback terminal e of the first power module 220 equals the preset voltage value, the voltage at the input terminal b of the processing module 210 is approximately 9.5mV higher than the preset voltage value, meaning the reference voltage is raised by 9.5mV. This results in significant energy waste.

[0141] When resistor RG has a high impedance of 200KΩ, and the voltage at the feedback terminal e of the first power supply module 220 is 1V, the voltage at the input terminal b of the processing module 210 is:

[0142] We can obtain V1 = Vb ≈ 1.000476.

[0143] In other words, when the resistor RG has a high impedance and the voltage at the feedback terminal e of the first power module 220 is equal to the preset voltage value, the voltage at the input terminal b of the processing module 210 is only about 0.476mV higher than the preset voltage value. That is, the reference voltage is only raised by 0.476mV, and there is almost no waste of power.

[0144] Therefore, when a low-level signal is input to the enable terminal h of the second power module 240 and the second power module 240 enters a non-operating state, it is necessary to make the impedance to ground of the output terminal g of the second power module 240 high. In this embodiment, to achieve "making the impedance to ground of the output terminal g of the second power module 240 high", the input terminal f of the second power module 240 can be left floating, even if the second voltage VB is not input to the input terminal f of the second power module 240. For this purpose, as shown in FIG16, the power supply circuit 20 may also include a first switch module 250.

[0145] The first switch module 250 has a first terminal j, a second terminal k, and a control terminal m. The first terminal j of the first switch module 250 is used to input a second voltage VB. The second terminal k of the first switch module 250 is connected to the input terminal f of the second power supply module 240. Thus, when the first switch module 250 is turned on, i.e., when the first terminal j and the second terminal k of the first switch module 250 are connected, the second voltage VB is input to the input terminal f of the second power supply module 240. When the first switch module 250 is turned off, i.e., when the first terminal j and the second terminal k of the first switch module 250 are disconnected, the second voltage VB is not input to the input terminal f of the second power supply module 240, and at this time, the input terminal f of the second power supply module 240 is floating. Here, the control terminal m of the first switch module 250 can be connected to the processing module 210 so that the processing module 210 can control the turning on and off of the first switch module 250. Alternatively, the control terminal m of the first switch module 250 can also be connected to other electronic devices with processing and control functions so that other electronic devices can control the turning on and off of the first switch module 250.

[0146] The circuit structure of the first switch module 250 will be described in detail below using two possible embodiments.

[0147] 1. In a first possible embodiment, the first switch module 250 includes only the first switch unit 252.

[0148] Figure 17 is a circuit structure diagram of a first switch module 250 provided in an embodiment of this application. As shown in Figure 17, the first switch module 250 may include only a first switch unit 252. The first switch unit 252 is an electrical unit used to control whether the input terminal f of the second power module 240 is input with a second voltage VB.

[0149] Here, the first terminal of the first switching unit 252 is the first terminal j of the first switching module 250, used to input the second voltage VB. The second terminal of the first switching unit 252 is the second terminal k of the first switching module 250, connected to the input terminal f of the second power supply module 240. The control terminal of the first switching unit 252 is the control terminal m of the first switching module 250.

[0150] In some specific embodiments, the first switching unit 252 includes a first transistor Q1 and a third resistor R3. The transistor can be a three-terminal switching device such as a field-effect transistor (FET) or a thyristor. For example, the transistor can be a metal-oxide-semiconductor field-effect transistor (MOSFET), and MOSFETs include N-type MOSFETs and P-type MOSFETs.

[0151] The first terminal of the first transistor Q1 is used to input the second voltage VB. That is, the first terminal of the first transistor Q1 is the first terminal j of the first switching module 250. The second terminal of the first transistor Q1 is connected to the input terminal f of the second power supply module 240. That is, the second terminal of the first transistor Q1 is the second terminal k of the first switching module 250. The first terminal of the third resistor R3 is connected to the first terminal of the first transistor Q1, and the second terminal of the third resistor R3 is connected to the control terminal of the first transistor Q1.

[0152] In this embodiment, the conduction and turn-off of the first and second terminals of the first transistor Q1 can be controlled by inputting different level signals to the control terminal of the first transistor Q1. For example, when the first transistor Q1 is a P-type transistor as shown in FIG17, the first transistor Q1 can be turned on by inputting a low-level signal to the control terminal of the first transistor Q1, that is, the first and second terminals of the first transistor Q1 are connected; the first transistor Q1 can be turned off by inputting a high-level signal to the control terminal of the first transistor Q1, that is, the first and second terminals of the first transistor Q1 are turned off. In this embodiment, the first terminal and the control terminal of the first transistor Q1 can also be made to have the same potential by controlling the control terminal of the first transistor Q1 to be in a high-impedance state, thereby turning off the first transistor Q1, which will not be elaborated further. In some other embodiments not shown, the first transistor Q1 can also be an N-type transistor. In this case, the first transistor Q1 can be turned on by inputting a high-level signal to the control terminal of the first transistor Q1; the first transistor Q1 can be turned off by inputting a low-level signal to the control terminal of the first transistor Q1.

[0153] 2. In a second possible embodiment, the first switch module 250 includes a first switch unit 252 and a first level conversion unit 254.

[0154] Figure 18 is a circuit structure diagram of another first switch module 250 provided in an embodiment of this application. As shown in Figure 18, the first switch module 250 may include a first level conversion unit 254 in addition to the first switch unit 252.

[0155] Here, the first terminal of the first switching unit 252 is used to input the second voltage VB. That is, the first terminal of the first switching unit 252 is the first terminal j of the first switching module 250. The second terminal of the first switching unit 252 is connected to the input terminal f of the second power supply module 240. That is, the second terminal of the first switching unit 252 is the second terminal k of the first switching module 250. The first switching unit 252 is an electrical unit used to control whether the second voltage VB is input to the input terminal f of the second power supply module 240.

[0156] The output terminal of the first level conversion unit 254 is connected to the control terminal of the first switching unit 252. The input terminal of the first level conversion unit 254 is the control terminal m of the first switching module 250, used to connect to the processing module 210 or other electronic devices with processing and control functions. The first level conversion unit 254 is an electrical unit used to convert high-level signals to low-level signals. That is, when the input terminal of the first level conversion unit 254 is a high-level signal, the output terminal of the first level conversion unit 254 is a low-level signal; when the input terminal of the first level conversion unit 254 is a low-level signal, the output terminal of the first level conversion unit 254 is a high-level signal.

[0157] In some specific embodiments, the circuit structure of the first switching unit 252 can be the same as that shown in Figure 17, and will not be described again. The first transistor Q1 can be a P-type transistor that is turned on at low levels and off at high levels. Based on this, the first switching module 250 may also include a second transistor Q2 and a fourth resistor R4. The first terminal of the second transistor Q2 is connected to the control terminal of the first transistor Q1. That is, the first terminal of the second transistor Q2 is the output terminal of the first level conversion unit 254. The second terminal of the second transistor Q2 is connected to ground. The control terminal of the second transistor Q2 is the input terminal of the first level conversion unit 254. The first terminal of the fourth resistor R4 is connected to the second terminal of the second transistor Q2, and the second terminal of the fourth resistor R4 is connected to the control terminal of the second transistor Q2.

[0158] In this embodiment, the second transistor Q2 is an N-type transistor that is off when low and on when high. When a high-level signal is input to the control electrode of the second transistor Q2, the second transistor Q2 is turned on. At this time, the control electrode of the first transistor Q1 is connected to ground through the second transistor Q2, that is, when a low-level signal is input to the control electrode of the first transistor Q1, the first and second electrodes of the first transistor Q1 are connected. When a low-level signal is input to the control electrode of the second transistor Q2, the second transistor Q2 is turned off. At this time, the control electrode of the first transistor Q1 receives a second voltage VB through the third resistor R3, that is, when a high-level signal is input to the control electrode of the first transistor Q1, the first and second electrodes of the first transistor Q1 are turned off.

[0159] Therefore, as shown in Figure 18, when a high-level signal is input to the control terminal m of the first switch module 250, the first terminal j and the second terminal k are connected; when a low-level signal is input to the control terminal m, the first terminal j and the second terminal k are disconnected. As described above, when a high-level signal is input to the enable terminal h of the second power module 240, the second power module 240 enters the working state; when a low-level signal is input to the enable terminal h of the second power module 240, the second power module 240 enters the non-working state. Based on this, as shown in Figure 19, the control terminal m of the first switch module 250 and the enable terminal h of the second power module 240 can be connected together, so that a single level signal can simultaneously control the first switch module 250 and the second power module 240. Furthermore, in this embodiment, when the control electrode of the first transistor Q1 is connected to ground through the second transistor Q2, the first transistor Q1 is turned on, which protects the first transistor Q1 from being burned out by high voltage.

[0160] It is readily understood that in this embodiment, the purpose of the first switch module 250 is to prevent the generation of the leakage path shown in FIG15 when the second power module 240 is not required to provide the first voltage VA to the third terminal 3 of the voltage divider module 230 (when the output terminal g of the second power module 240 has a high impedance to ground, it is considered an open circuit, and at this time it is considered that the leakage path shown in FIG15 does not exist). In this embodiment of the application, the purpose of "preventing the generation of leakage path when the second power module 240 is not required to provide the first voltage VA to the third terminal 3 of the voltage divider module 230" can also be achieved by the following scheme: the processing module 210 or other electronic devices with processing control functions transmit a third communication signal to the second power module 240 through the communication terminal i of the second power module 240. The third communication signal is used to control the output impedance of the output terminal g of the second power module 240 to be high impedance. In other words, when the second voltage VB is input to the input terminal f of the second power module 240, and a high-level signal is input to the enable terminal h of the second power module 240, and the second power module 240 enters the working state, if a third communication signal is input to the communication terminal i of the second power module 240, then the output impedance of the output terminal g of the second power module 240 will be high impedance. In this case, since the output impedance of the output terminal g of the second power module 240 is high impedance, on the one hand, the second power module 240 cannot provide the first voltage VA to the third terminal 3 of the voltage divider module 230, and on the other hand, there will be no leakage path as shown in Figure 15.

[0161] IV. Other circuit structures.

[0162] 1. Setting of the voltage stabilizing capacitor in power supply circuit 20.

[0163] In this embodiment, to ensure a stable reference voltage is input to input terminal b of processing module 210, the first voltage VA input to the third terminal 3 of voltage divider module 230 should have low ripple. Based on this, voltage regulating capacitors can be provided at input terminal f and output terminal g of second power supply module 240, respectively.

[0164] As shown in Figure 20, in some embodiments, the power supply circuit 20 includes a first capacitor C1, which is a voltage-regulating capacitor disposed at the input terminal f of the second power module 240. In this embodiment, when the power supply circuit 20 includes a first switching module 250, the first plate of the first capacitor C1 is connected to the first terminal j of the first switching module 250, and the second plate of the first capacitor C1 is connected to ground. That is, the first capacitor C1 is connected to the input terminal f of the second power module 240 through the first switching module 250.

[0165] It is easy to understand that when the first capacitor C1 is directly connected to the input terminal f of the second power module 240, that is, when the first plate of the first capacitor C1 is connected to the second terminal k of the first switch module 250 and the input terminal f of the second power module 240, the presence of the first capacitor C1 will prevent the input terminal f of the second power module 240 from being floating, resulting in the leakage path shown in Figure 15, when the second power module 240 changes from an operating state to an inoperable state and the first switch module 250 changes from an on state to an off state. Therefore, in this embodiment, the first capacitor C1 is connected to the input terminal f of the second power module 240 through the first switch module 250. Thus, when the first switch module 250 is turned off, the input terminal f of the second power module 240 can immediately enter a floating state, unaffected by the first capacitor C1.

[0166] In some embodiments, the power supply circuit 20 includes a second capacitor C2, which is a voltage-regulating capacitor disposed at the output terminal g of the second power module 240. The first plate of the second capacitor C2 is connected to the output terminal g of the second power module 240, and the second plate of the second capacitor C2 is connected to the ground wire.

[0167] 2. Circuit structure of the second switch module 260 used to prevent the leakage path shown in Figure 15.

[0168] As mentioned above, the function of the first switch module 250 is as follows: when a high-level signal is input to the enable terminal h of the second power module 240 and the second power module 240 enters the working state, it is turned on, allowing the input terminal f of the second power module 240 to input the second voltage VB through the first switch module 250, thereby outputting the first voltage VA to the third terminal 3 of the voltage divider module 230; when a low-level signal is input to the enable terminal h of the second power module 240 and the second power module 240 enters the non-working state, it is turned off, leaving the input terminal f of the second power module 240 floating, thereby making the impedance to ground of the output terminal g of the second power module 240 high. In some embodiments, as shown in FIG21, the power supply circuit 20 may also include a second switch module 260. The second switch module 260 is used to: turn on when the second power module 240 enters the working state, so that the output terminal g of the second power module 240 outputs the first voltage VA to the third terminal 3 of the voltage divider module 230 through the second switch module 260; and turn off when the second power module 240 enters the non-working state, so as to cut off the leakage path shown in Figure 15.

[0169] The second switch module 260 has a first terminal n, a second terminal p, and a control terminal q. The first terminal n of the second switch module 260 is connected to the output terminal g of the second power supply module 240, and the second terminal p of the second switch module 260 is connected to the third terminal 3 of the voltage divider module 230. Thus, when the second switch module 260 is turned on, that is, when the first terminal n and the second terminal p of the second switch module 260 are connected, the output terminal g of the second power supply module 240 is connected to the third terminal 3 of the voltage divider module 230, so that the output terminal g of the second power supply module 240 can output a first voltage VA to the third terminal 3 of the voltage divider module 230 through the second switch module 260. When the second switch module 260 is turned off, that is, when the first terminal n and the second terminal p of the second switch module 260 are disconnected, the output terminal g of the second power supply module 240 is not connected to the third terminal 3 of the voltage divider module 230, thereby cutting off the leakage path and avoiding energy waste. Here, the control terminal q of the second switch module 260 can be connected to the processing module 210 so that the processing module 210 can control the switching on and off of the second switch module 260. Alternatively, the control terminal q of the second switch module 260 can also be connected to other electronic devices with processing and control functions so that the other electronic devices can control the switching on and off of the second switch module 260.

[0170] Figure 22 is a circuit diagram of a second switch module 260 provided in an embodiment of this application. As shown in Figure 22, in one possible embodiment, the second switch module 260 includes only a second switch unit 262. The second switch unit 262 includes a third transistor Q3 and a fifth resistor R5. The first terminal of the third transistor Q3 is connected to the output terminal g of the second power supply module 240, and the second terminal of the third transistor Q3 is connected to the third terminal 3 of the voltage divider module 230. The first terminal of the fifth resistor R5 is connected to the first terminal of the third transistor Q3, and the second terminal of the fifth resistor R5 is connected to the control terminal of the third transistor Q3. The third transistor Q3 can be a P-type transistor as shown in Figure 22, or it can be an N-type transistor. It is understood that the circuit structure and conduction principle of the second switch module 260 described in Figure 22 are the same as those of the first switch module 250 shown in Figure 17, and will not be described again.

[0171] In another possible embodiment, as shown in FIG23, the second switch module 260 includes a second switch unit 262 and a second level conversion unit 264. The third transistor Q3 in the second switch unit 262 is a P-type transistor. The second level conversion unit 264 includes a fourth transistor Q4 and a sixth resistor R6. The first terminal of the fourth transistor Q4 is connected to the control terminal of the third transistor Q3. The second terminal of the fourth transistor Q4 is connected to ground. The first terminal of the sixth resistor R6 is connected to the second terminal of the fourth transistor Q4, and the second terminal of the sixth resistor R6 is connected to the control terminal of the fourth transistor Q4. The fourth transistor Q4 is an N-type transistor. It is understood that the circuit structure and conduction principle of the second switch module 260 shown in FIG23 are the same as those of the first switch module 250 shown in FIG18, and will not be described again.

[0172] As shown in Figure 23, the second switch module 260 conducts between its first terminal n and second terminal p when a high-level signal is input to the control terminal q; and it turns off between its first terminal n and second terminal p when a low-level signal is input to the control terminal q. Based on this, when the circuit structure of the second switch module 260 is as shown in Figure 23, the control terminal q of the second switch module 260 can be connected to the enable terminal h of the second power supply module 240, so that a single level signal can simultaneously control both the second switch module 260 and the second power supply module 240.

[0173] It is understood that in the embodiments of this application, the power supply circuit 20 may include only one of the first switch module 250 and the second switch module 260, or it may include both the first switch module 250 and the second switch module 260. In some other embodiments, if a third communication signal can be transmitted to the communication terminal i of the second power module 240, and the output impedance of the output terminal g of the second power module 240 is adjusted to a high impedance by the third communication signal, then the power supply circuit 20 may not include the first switch module 250 and the second switch module 260.

[0174] 3. Other optional circuit structures.

[0175] Figure 24 is a circuit structure diagram of another power supply circuit 20 provided in an embodiment of this application. As shown in Figure 24, in this embodiment, the output terminal d of the first power module 220 may include multiple sub-ports, each of which can be connected to the first terminal of the PDN through an inductor. That is, multiple sub-ports are used together to supply power to the processing module 210. Here, "multiple" refers to two or more integers. For example, in the embodiment shown in Figure 24, the output terminal d of the first power module 220 includes sub-port d1, sub-port d2, and sub-port d3. The power supply circuit 20 also includes a first inductor L1, a second inductor L2, and a third inductor L3. Sub-port d1 corresponds to the first inductor L1, the first terminal of the first inductor L1 is connected to sub-port d1, and the second terminal of the first inductor L1 is connected to the input terminal of the processing module 210 through the PDN. Sub-port d2 corresponds to the second inductor L2, the first terminal of the second inductor L2 is connected to sub-port d2, and the second terminal of the second inductor L2 is connected to the input terminal of the processing module 210 through the PDN. Sub-port d3 corresponds to the third inductor L3. The first end of the third inductor L3 is connected to sub-port d3, and the second end of the third inductor L3 is connected to the input terminal of the processing module 210 through the PDN. Thus, the first power module 220 can supply power to the processing module 210 through multiple inductors. It is easy to understand that the current drawn by the processing module 210 during operation is relatively large. Therefore, if the first power module 220 supplies power to the processing module 210 through one inductor, that inductor needs to have a large maximum current value. Inductors with large maximum current values ​​typically occupy a large area and volume, which is detrimental to improving the integration of the power supply circuit 20. Based on this, in this embodiment, the first power module 220 can supply power to the processing module 210 through multiple inductors. This reduces the current flowing through each inductor during the operation of the processing module 210, thereby reducing the maximum current value of each inductor, reducing the area and volume occupied by the inductors, and also facilitating inductor heat dissipation. The maximum current value of an inductor refers to the maximum current value that can ensure the inductor works normally. In other words, if the current in the inductor exceeds the maximum current value, the inductor cannot work normally.

[0176] Generally, as shown in Figure 25, the first power module 220 may include a control unit and multiple voltage conversion units. All voltage conversion units are used for DC voltage conversion. The number of voltage conversion units is the same as the number of sub-ports at the output terminal d of the first power module 220. Each voltage conversion unit corresponds one-to-one with its sub-port. Each voltage conversion unit outputs electrical energy through its corresponding sub-port. The control unit controls the operation of each voltage conversion unit. Here, the control logic for each voltage conversion unit can be the same. Specifically, the operation of the first power module 220 is as follows: when the control unit receives a preset voltage value, it controls each voltage conversion unit to output a reference voltage from its corresponding sub-port to the input terminal b of the processing module 210, thereby supplying power to the processing module 210; during the power supply process to the processing module 210, the reference voltage output by each voltage conversion unit to the input terminal b of the processing module 210 is adjusted according to the voltage at the feedback terminal e of the first power module 220, so that the voltage value at the feedback terminal e of the first power module 220 is equal to the preset voltage value.

[0177] As shown in Figure 25, the power module 120 contains resistors Ra and Rb connected in series. Resistors Ra and Rb are voltage divider sampling resistors, connected in series between the feedback terminal e and ground. Resistors Ra and Rb are connected to node A. The control unit can detect the voltage value at node A and obtain the voltage value at the feedback terminal e based on the voltage value at node A and the ratio of the resistance values ​​of resistors Ra and Rb.

[0178] The following, in conjunction with the accompanying drawings, provides a detailed explanation of the power supply circuit 20 and its application scenarios provided in this application embodiment, based on three different scenarios of a specific implementation.

[0179] As shown in Figure 24 or Figure 25, the power supply circuit 20 may include a processing module 210, a first power supply module 220, a PDN, a voltage divider module 230, a second switch module 260, a second power supply module 240, a first switch module 250, a first capacitor C1, and a second capacitor C2. The first switch module 250 includes a first switch unit 252 and a first level conversion unit 254, and its control terminal m is connected to the enable terminal h of the second power supply module 240, controlled by a single level signal. The second switch module 260 includes only a second switch unit 262, which is controlled by another level signal.

[0180] In the following description, the enable terminal h of the second power module 240, the control terminal m of the first switch module 250, and the control terminal q of the second switch module 260 are all connected to the processing module 210, so that the processing module 210 can control whether the second power module 240 is working, whether the first switch module 250 is turned on or off, and whether the second switch module 260 is turned on or off. In the following description, the communication terminal i of the second power module 240 is communicatively connected to the processing module 210, so that the processing module 210 can adjust the magnitude of the first voltage VA output by the output terminal g of the second power module 240 through a second communication signal. In the following description, the preset voltage value is 1V.

[0181] The power supply circuit 20 can be applied to the following three different working scenarios.

[0182] 1. The reference voltage input to the processing module 210 is low, causing the actual voltage input to input terminal b of the processing module 210 to be less than the first voltage threshold Vth1 when the processing module 210 is working.

[0183] For electronic devices with high PDN impedance, the reference voltage input to processing module 210 may be low. If the actual voltage input to input terminal b is less than the first voltage threshold Vth1 when processing module 210 is operating, it will fail to function properly. This manifests as a system crash in the electronic device to which power supply circuit 20 is used. Therefore, in this scenario, power supply circuit 20 can increase the reference voltage input to input terminal b of processing module 210.

[0184] Specifically, when the processing module 210 is powered on, it can transmit a preset voltage value to the first power module 220 via communication terminal a. During the process of the first power module 220 supplying power to the processing module 210, if the processing module 210 detects that the reference voltage input at input terminal b is low, then:

[0185] Firstly, the processing module 210 inputs a high-level signal to the enable terminal h of the second power module 240 and the control electrode of the second transistor Q2 to control the second power module 240 to enter the working state, and the second transistor Q2 is turned on. When the second transistor Q2 is turned on, the first transistor Q1 is turned on. Secondly, the processing module 210 inputs a low-level signal to the control electrode of the third transistor Q3 to control the third transistor Q3 to be turned on. Thirdly, the processing module 210 transmits a second communication signal to the communication terminal i of the second power module 240 to adjust the value of the first voltage VA output by the output terminal g of the second power module 240 to 0.5V.

[0186] In this configuration, the input terminal f of the second power supply module 240 receives the second voltage VB through the first transistor Q1, and the output terminal g of the second power supply module 240 outputs a first voltage VA of 0.5V to the third terminal of the voltage divider module 230 through the third transistor Q3. Due to the voltage division effect of the first resistor R1 and the second resistor R2, when the voltage at the second terminal of the voltage divider module 230 is equal to 1V, the voltage at the first terminal of the voltage divider module 230 must be greater than 1V, meaning the reference voltage input to the input terminal b of the processing module 210 is greater than 1V. This allows for the raising of the reference voltage input to the input terminal b of the processing module 210.

[0187] 2. The reference voltage input to the processing module 210 is relatively high, and the processing module 210 itself has high power consumption.

[0188] The higher reference voltage input to processing module 210 refers to the reference voltage input to processing module 210 after PDN impedance optimization. The higher power consumption of processing module 210 itself indicates that processing module 210 needs to process a large amount of data. Reflected in the electronic device using power supply circuit 20, the power consumption of processing module 210 is higher when the electronic device is in a state such as gaming, running multiple applications (APPs) simultaneously, or navigating. Therefore, in this scenario, power supply circuit 20 can reduce the reference voltage input to input terminal b of processing module 210.

[0189] Specifically, when the processing module 210 is powered on, it can transmit a preset voltage value to the first power module 220 via communication terminal a. During the process of the first power module 220 supplying power to the processing module 210, if the processing module 210 detects that the reference voltage input at input terminal b is high and there is a large amount of data to be processed, then:

[0190] Firstly, the processing module 210 inputs a high-level signal to the enable terminal h of the second power module 240 and the control electrode of the second transistor Q2 to control the second power module 240 to enter the working state, and the second transistor Q2 is turned on. When the second transistor Q2 is turned on, the first transistor Q1 is turned on. Secondly, the processing module 210 inputs a low-level signal to the control electrode of the third transistor Q3 to control the third transistor Q3 to be turned on. Thirdly, the processing module 210 transmits a second communication signal to the communication terminal i of the second power module 240 to adjust the value of the first voltage VA output by the output terminal g of the second power module 240 to 3V.

[0191] In this configuration, the input terminal f of the second power supply module 240 receives the second voltage VB through the first transistor Q1, and the output terminal g of the second power supply module 240 outputs a first voltage VA of 3V to the third terminal of the voltage divider module 230 through the third transistor Q3. Due to the voltage division effect of the first resistor R1 and the second resistor R2, when the voltage at the second terminal of the voltage divider module 230 is equal to 1V, the voltage at the first terminal of the voltage divider module 230 must be less than 1V, meaning the reference voltage input to the input terminal b of the processing module 210 is less than 1V. This allows for a reduction in the reference voltage input to the input terminal b of the processing module 210.

[0192] In both of the above operating scenarios, the second power module 240 is in an active state. The circuit consisting of the second power module 240, the first switch module 250, and the second switch module 260 is in an active state.

[0193] 3. The reference voltage input to the processing module 210 is relatively high, but the power consumption of the processing module 210 itself is low.

[0194] The low power consumption of processing module 210 means that it needs to process less data. Reflected in the electronic equipment used in the power supply circuit 20, the power consumption of processing module 210 is low when the electronic equipment is in standby or without program operation. It is easy to understand that when the second power module 240 is in operation, the second power module 240, the first switch module 250, and the second switch module 260 also generate some power consumption. Therefore, when the power consumption of processing module 210 is low, it can control the second power module 240 to be inactive and control the first switch module 250 and the second switch module 260 to be turned off to avoid wasting energy. In this case, we have:

[0195] In one aspect, the processing module 210 inputs a low-level signal to the enable terminal h of the second power module 240 and the control terminal of the second transistor Q2 to control the second power module 240 to enter a non-operating state and turn off the second transistor Q2. When the second transistor Q2 is turned off, the first transistor Q1 is also turned off. In another aspect, the processing module 210 inputs a high-level signal to the control terminal of the third transistor Q3 to control the third transistor Q3 to turn off.

[0196] In this operating scenario, the second power module 240 is inactive. The circuit consisting of the second power module 240, the first switch module 250, and the second switch module 260 is in an inactive bypass state. In this operating scenario, since there is no input voltage at the third terminal 3 of the voltage divider module 230, the voltages at the first terminal 1 and the second terminal 2 of the voltage divider module 230 are the same, without considering leakage current. This makes the voltage at the feedback terminal e of the first power module 220 equal to the voltage at the input terminal b of the processing module 210, i.e., V2 = Ve = V1 = Vb.

[0197] It is easy to understand that the power consumption of the processing module 210 is generally related to its operating frequency. Based on this, the processing module 210 can obtain its own power consumption by detecting its own operating frequency and determine whether its power consumption is high or low. In this embodiment, the criteria for determining the power consumption of the processing module 210, and the conditions for the processing module 210 to adjust the value of the first voltage VA output from the output terminal g of the second power module 240, can be set by those skilled in the art based on the specific parameters of the power supply circuit 20 and different scenarios of the electronic device.

[0198] The power supply circuit 20 provided in this application embodiment has at least the following beneficial effects: (1) Based on the setting of the voltage divider module 230, the reference voltage input to the input terminal b of the processing module 210 can be reduced, thereby saving power consumption. Alternatively, based on the setting of the voltage divider module 230, the reference voltage input to the input terminal b of the processing module 210 can be increased, thereby improving system stability. (2) Using an LDO as the second power supply module 240 can provide a stable first voltage VA with low ripple to the third terminal 3 of the voltage divider module 230. (3) By setting the first switch module 250, when the second power supply module 240 enters the non-working state, the input terminal f of the second power supply module 240 can be left floating, thereby making the impedance to ground of the output terminal g of the second power supply module 240 high impedance. (4) By setting the second switch module 260, when the second power supply module 240 enters the non-working state, the leakage path in the power supply circuit 20 can be cut off, thereby avoiding energy waste. (5) The output impedance of the output terminal g of the second power module 240 can be controlled to be high impedance by transmitting a third communication signal to the communication terminal i of the second power module 240, thereby preventing the generation of leakage paths. (6) The raising or lowering of the reference voltage does not depend on the resistors Ra and Rb in the first power module 120 in the related art. When the voltage divider module 230 only includes the first resistor R1 and the second resistor R2, that is, when the voltage divider module 230 does not introduce capacitors, inductors and other devices, the voltage divider module 230 will not cause changes in the zeros and poles in the circuit and will not affect the transfer function of the power supply circuit 20. (7) It does not involve improvements to the processing module 210 and the first power module 220, making the whole scheme easier to implement and lower in cost. (8) By adding the voltage divider module 230 and the second power module 240 between the first power module 120 and the processing module 110 in the related art to raise or lower the reference voltage, the response speed is fast. (9) Regardless of whether the second power module 240 is in operation, it does not affect the stability of the circuit between the processing module 210 and the first power module 220.

[0199] This application also provides an electronic device, including a power supply circuit 20 as described in any of the above embodiments.

[0200] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A power supply circuit, characterized by comprising: The power supply circuit comprises a processing module, a first power supply module and a voltage dividing module. The communication end of the processing module is connected with the communication end of the first power supply module, and the processing module is configured to transmit a communication signal to the first power supply module at power-on, the communication signal being configured to indicate a preset voltage value; the output end of the first power supply module is connected with the input end of the processing module to supply power to the processing module. The first end of the voltage dividing module is connected with the input end of the processing module, the second end of the voltage dividing module is connected with the feedback end of the first power supply module, and the third end of the voltage dividing module is configured to input a first voltage; the voltage value of the second end of the voltage dividing module is between the voltage value of the first end of the voltage dividing module and the voltage value of the third end of the voltage dividing module, and the voltage value of the second end of the voltage dividing module is positively correlated with the voltage value of the first end of the voltage dividing module. The first power supply module is configured to adjust the reference voltage output to the input end of the processing module according to the voltage of the feedback end, so that the value of the voltage of the feedback end is equal to the preset voltage value.

2. The power supply circuit of claim 1, wherein, The voltage dividing module comprises a first resistor and a second resistor. The first end of the first resistor is connected with the input end of the processing module, the second end of the first resistor is connected with the first end of the second resistor and the feedback end of the first power supply module, and the second end of the second resistor is configured to input the first voltage.

3. The power supply circuit of claim 2, wherein, The resistance value of the first resistor is greater than or equal to 10 ohms, and the resistance value of the first resistor is less than or equal to 100 ohms. The resistance value of the second resistor is greater than or equal to 1 kilo-ohm.

4. The power supply circuit according to any one of claims 1 to 3, wherein The power supply circuit further comprises a second power supply module. The input end of the second power supply module is configured to input a second voltage, and the output end of the second power supply module is connected with the third end of the voltage dividing module to output the first voltage to the third end of the voltage dividing module.

5. The power supply circuit of claim 4, wherein, The second power supply module comprises a linear voltage regulator.

6. A power supply circuit as claimed in claim 4 or 5, characterized in that, The power supply circuit further comprises a first switch module. The first end of the first switch module is configured to input the second voltage, and the second end of the first switch module is connected with the input end of the second power supply module.

7. The power supply circuit of claim 6, wherein, The first switch module comprises a first transistor and a third resistor. The first pole of the first transistor is configured to input the second voltage, and the second pole of the first transistor is connected with the input end of the second power supply module. The first end of the third resistor is connected with the first pole of the first transistor, and the second end of the third resistor is connected with the control pole of the first transistor.

8. The power supply circuit of claim 7, wherein, The first transistor is a P-type transistor. The first switch module further comprises a second transistor and a fourth resistor. The first pole of the second transistor is connected with the control pole of the first transistor, the second pole of the second transistor is connected with a ground wire, and the second transistor is an N-type transistor. The first end of the fourth resistor is connected with the second pole of the second transistor, and the second end of the fourth resistor is connected with the control pole of the second transistor. The power supply circuit further comprises a first capacitor.

9. A power supply circuit as claimed in any one of claims 6 to 8, characterized in that, ​ The first plate of the first capacitor is connected with the first end of the first switch module, and the second plate of the first capacitor is connected with the ground wire.

10. A power supply circuit as claimed in any one of claims 4 to 9, characterized in that, The power supply circuit further comprises a second capacitor. The first plate of the second capacitor is connected with the output end of the second power module, and the second plate of the second capacitor is connected with the ground wire.

11. A power supply circuit as claimed in any one of claims 4 to 10, characterized in that, The power supply circuit further comprises a second switch module. The first end of the second switch module is connected with the output end of the second power module, and the second end of the second switch module is connected with the third end of the voltage division module.

12. The power supply circuit of claim 11, wherein, The second switch module comprises a third transistor and a fifth resistor. The first pole of the third transistor is connected with the output end of the second power module, and the second pole of the third transistor is connected with the third end of the voltage division module. The first end of the fifth resistor is connected with the first pole of the third transistor, and the second end of the fifth resistor is connected with the control pole of the third transistor.

13. The power supply circuit according to any one of claims 1 to 12, wherein The output end of the first power module comprises a plurality of sub-ports; the power supply circuit further comprises a plurality of inductors. The plurality of inductors correspond to the plurality of sub-ports one by one; the first end of any one of the plurality of inductors is connected with the corresponding sub-port, and the second end of each of the plurality of inductors is connected with the input end of the processing module.

14. The power supply circuit according to any one of claims 1 to 13, wherein The power supply circuit further comprises a power distribution network. The first end of the power distribution network is connected with the output end of the first power module, the second end of the power distribution network is connected with the input end of the processing module, and the first power module supplies power to the processing module through the power distribution network.

15. An electronic device, comprising: The power supply circuit comprises the power supply circuit according to any one of claims 1 to 14.

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