Power supply circuit, power supply method and electronic equipment

Abstract

The invention discloses a power supply circuit, a power supply method and electronic equipment, the power supply circuit comprises a coprocessor, an acquisition sub-circuit and a comparison sub-circuit, the acquisition sub-circuit acquires a first power supply signal sent by a power management module to a display screen, converts the first power supply signal into a first voltage signal and outputs the first voltage signal, receiving a first reference voltage signal through a comparison sub-circuit, outputting a first voltage signal under the condition that the voltage of the first voltage signal is greater than that of the first reference voltage signal, obtaining an initial current value of a first power supply signal through a coprocessor according to the first voltage signal, and generating a control instruction according to the initial current value; and according to the control instruction, the main processor controls the power management module to increase the voltage of the first power supply signal according to the voltage increase amount corresponding to the initial current value.

Description

Technical Field

[0001] The present application belongs to the technical field of display screens, and specifically relates to a power supply circuit, a power supply method, and an electronic device. Background Art

[0002] In electronic devices, the power supply supplies power to the display screen through the power management module, and there is impedance in the power supply line between the power management module and the display screen.

[0003] However, when the current value of the power supply signal output by the power management module is greater than or equal to the current threshold, the voltage drop caused by the impedance of the power supply line is greater than or equal to the voltage drop threshold. At this time, the voltage of the power supply signal received by the display screen is less than the minimum power supply voltage, and the brightness of the display screen is reduced, resulting in poor stability of the brightness of the display screen. Summary of the Invention

[0004] The present application aims to provide a power supply circuit, a power supply method and an electronic device, which at least solve the problem in the related art that the voltage drop caused by the impedance of the power supply line leads to poor voltage stability of the power supply signal received by the display screen.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides a power supply circuit, comprising: a coprocessor, an acquisition subcircuit, and a comparison subcircuit;

[0007] The acquisition subcircuit is connected to the comparison subcircuit, and the acquisition subcircuit is respectively connected to a power management module of a display screen of the electronic device and the display screen, and acquires a first power supply signal sent by the power management module to the display screen, and converts the first power supply signal into a first voltage signal and outputs the first voltage signal;

[0008] The comparison subcircuit is connected to the coprocessor, the comparison subcircuit is connected to the power management module, and receives a first reference voltage signal, and outputs the first voltage signal when the voltage of the first voltage signal is greater than the voltage of the first reference voltage signal;

[0009] The coprocessor is used to obtain an initial current value of the first power supply signal based on the first voltage signal, and generate a control instruction based on the initial current value, so that the main processor of the electronic device can control the power management module to increase the voltage of the first power supply signal according to the voltage increase amount corresponding to the initial current value according to the control instruction.

[0010] In a second aspect, an embodiment of the present application further provides a power supply method, the method comprising:

[0011] Acquire a first power supply signal sent by a power management module of the electronic device to a display screen of the electronic device, and convert the first power supply signal into a first voltage signal;

[0012] When the voltage of the first voltage signal is greater than the voltage of the first reference voltage signal, obtaining an initial current value of the first power supply signal according to the first voltage signal;

[0013] According to a preset correspondence between a reference current value and a reference voltage increase, a voltage increase corresponding to the initial current value is obtained, and the voltage of the first power supply signal is increased according to the voltage increase.

[0014] In a third aspect, an embodiment of the present application further provides an electronic device, comprising the power supply circuit as described in the first aspect, or implementing the steps of the power supply method as described in the second aspect.

[0015] In an embodiment of the present application, an acquisition subcircuit acquires a first power supply signal sent by a power management module to a display screen, converts the first power supply signal into a first voltage signal and outputs the signal, then a comparison subcircuit receives a first reference voltage signal, and outputs the first voltage signal when the voltage of the first voltage signal is greater than the voltage of the first reference voltage signal, then a coprocessor obtains an initial current value of the first power supply signal based on the first voltage signal, and generates a control instruction based on the initial current value, so that the main processor controls the power management module according to the control instruction to increase the voltage of the first power supply signal according to the voltage increase amount corresponding to the initial current value, thereby increasing the voltage of the first power supply signal. When the initial current value of the first power supply signal output by the power management module is greater than or equal to the current threshold, the power supply voltage of the display screen is boosted to offset the voltage drop caused by the impedance of the power supply line between the power management module and the display screen, thereby improving the voltage stability of the power supply signal received by the display screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of a power supply circuit provided in an embodiment of the present application;

[0017] Figure 2 This is a schematic diagram of a specific structure of a power supply circuit provided in an embodiment of the present application;

[0018] Figure 3 Schematic diagram of a power supply control sub-circuit and an auxiliary power supply sub-circuit provided in an embodiment of the present application;

[0019] Figure 4 is a schematic diagram of an acquisition sub-circuit and a comparison sub-circuit provided in an embodiment of the present application;

[0020] Figure 5 This is a voltage curve schematic diagram provided in an embodiment of the present application;

[0021] Figure 6 This is a flowchart of the steps of a power supply method provided in an embodiment of the present application.

[0022] Reference numerals:

[0023] 10-coprocessor; 20-power supply control subcircuit; 21-voltage conversion unit; 30-auxiliary power supply subcircuit; 31-voltage detection module; 32-charge pump module; 40-acquisition subcircuit; 41-op amp unit; 50-comparison subcircuit; 51-filter unit; 60-power supply; 70-power management module; 701-analog power input terminal; 702-reference power input terminal; 703-power supply input terminal; 704-analog power positive terminal; 705-analog power negative terminal; 706-analog power supply terminal; 707-first control terminal; 708-second control terminal; 709-analog ground terminal; 7010-fault detection terminal; 80-main processor; 81-electricity meter; 90-display screen; 91-display driver chip; 92-display screen board; P1-first operational amplifier; P2-second operational amplifier; P3-third operational amplifier; Q1-first switching device; Q2-second switching device; Q3-third switching device; R1-first resistor; R2-second resistor; R3-third resistor; R4-fourth resistor; R5-fifth resistor; R6-sixth resistor; L1-inductor; C1-first capacitor; C2-second capacitor; C3-third capacitor; C4-fourth capacitor; X3-first reference voltage signal; X7-second reference voltage signal; X1-first power supply signal; X4-second power supply signal; X5-third power supply signal; X6-fourth power supply signal; X9-fifth power supply signal; X8-sixth power supply signal; X2-first voltage signal; X10-second voltage signal;. DETAILED DESCRIPTION

[0024] The following will be combined with the accompanying drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0025] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0026] Reference Figure 1 , an embodiment of the present application provides a power supply circuit, including: a coprocessor 10 and a power supply control subcircuit 20; the coprocessor 10 is connected to the power supply control subcircuit 20, the coprocessor 10 is connected to the main processor 80 of the electronic device, and obtains the power level of the power supply 60 of the electronic device through the main processor 80, and when the power level is less than or equal to the power threshold, controls the power supply control subcircuit 20 to boost the second power supply signal of the power supply 60 and output a third power supply signal to power the power management module 70; the power supply control subcircuit 20 is connected to the power supply 60 and the power management module 70 respectively.

[0027] In some embodiments, the coprocessor 10 is further configured to control the power supply control subcircuit 20 to output a second power supply signal of the power supply 60 to supply power to the power management module 70 when the power supply is greater than a power threshold.

[0028] In some embodiments, when the power supply voltage of the power management module 70 is greater than or equal to a preset voltage value, the brightness of the display screen 90 can be maintained at a normal brightness value, that is, the brightness of the display screen 90 is stabilized at a normal brightness value, thereby improving the stability of the brightness of the display screen 90; when the power supply voltage of the power management module 70 is less than the preset voltage value, the power supply voltage of the power management module 70 is too low, and the brightness of the display screen 90 is an abnormal brightness value, that is, the brightness of the display screen 90 is lower than the normal brightness value.

[0029] In some embodiments, the preset voltage value is 3.4 volts.

[0030] In some embodiments, when the power level is greater than the power threshold, the voltage of the second power signal of the power supply 60 is greater than or equal to the preset voltage value; when the power level is less than or equal to the power threshold, the second power signal of the power supply 60 is less than the preset voltage value.

[0031] In some embodiments, the third power supply signal is greater than or equal to a preset voltage value.

[0032] When the power level is greater than the power threshold, it means that the power supply 60 has sufficient power and the power supply voltage of the power management module 70 is normal, that is, the voltage of the second power supply signal is normal, and the load capacity of the output current of the power management module 70 is normal, so that the brightness of the display screen 90 remains at a normal brightness value; when the power level is less than or equal to the power threshold, it means that the power level of the power supply 60 is too low, that is, the voltage of the second power supply signal is too low, and the second power supply signal needs to be boosted and the third power supply signal is output. The third power supply signal is used to power the power management module 70, so that the power supply voltage of the power management module 70 is normal, and the load capacity of the output current of the power management module 70 is normal, so that the brightness of the display screen 90 remains at a normal brightness value.

[0033] In some embodiments, in an electronic device, a power meter 81 is provided in the main processor 80, and the power meter 81 is connected to the power supply 60 of the electronic device. The power meter 81 is used to obtain the power of the power supply 60, and the coprocessor 10 obtains the power of the power supply 60 of the electronic device from the power meter 81.

[0034] In some embodiments, the battery threshold ranges from 20% to 30%, for example, the battery threshold is 20%.

[0035] In some embodiments, the display screen 90 of the electronic device includes a display driver chip 91 (DDIC, Display Driver Integrated Circuit), a display panel 92 (Panel) and a memory (such as Flash). The display driver chip 91 is respectively connected to the display panel 92, the memory and the power management module 70 (PMIC, Power Management Integrated Circuit) of the display screen 90 and the main processor 80 (AP, Application Processor) of the electronic device; the AP sends the image data to the DDIC through the MIPI (Mobile Industry Processor Interface, a serial communication interface) interface. After receiving the image data, the DDIC processes and stores it. According to the processed data and timing requirements, the DDIC sends a driving signal to the Panel to control the pixel display of the Panel. The Flash stores the screen compensation data and the DDIC firmware. The DDIC reads the screen compensation data and the DDIC firmware from the Flash to optimize the display effect and its own functions.

[0036] In some embodiments, the AP is a core processor of a mobile phone, which implements logic control, calculation and communication scheduling functions; the display screen 90 is a display screen of the mobile phone.

[0037] In some embodiments, the coprocessor 10 is a processor with a high-voltage input port, such as STM32.

[0038] Reference Figure 2 In some embodiments, the output terminal of the power supply control subcircuit 20 is respectively connected to the analog power input terminal 701, the reference power input terminal 702 and the power power input terminal 703 of the power management module 70, and the power supply 60 supplies power to the power management module 70 through the power supply control subcircuit 20; the analog power positive terminal 704 of the power management module 70 is connected to the positive electrode of the DDIC, the analog power negative terminal 705 of the power management module 70 is connected to the negative electrode of the DDIC, and the analog power supply terminal 706 of the power management module 70 is respectively connected to the power supply terminal of the DDIC, so that the power management module 70 supplies power to the DDIC; the first control terminal 707 of the power management module 70 is connected to the first feedback terminal of the DDIC, and the DDIC passes The first feedback signal is sent to the first control terminal 707 of the power management module 70 to adjust the voltage difference between the analog power positive terminal 704 and the analog power negative terminal 705 of the power management module 70, wherein the voltage difference between the analog power positive terminal 704 and the analog power negative terminal 705 of the power management module 70 is positively correlated with the initial current value of the first power supply signal output by the analog power positive terminal 704 of the power management module 70, and the initial current value of the first power supply signal is positively correlated with the brightness of the display screen 90. For example, the first feedback signal is a pulse signal, and the number of pulses per unit time of the first feedback signal is increased to increase the voltage difference between the analog power positive terminal 704 and the analog power negative terminal 705 of the power management module 70;

[0039] The second control terminal 708 of the power management module 70 is connected to the second feedback terminal of the DDIC. The DDIC adjusts the output signal of the analog power supply terminal 706 of the power management module 70 by sending a second feedback signal to the second control terminal 708 of the power management module 70. For example, the second feedback signal is a pulse signal, and the number of pulses per unit time of the second feedback signal is increased to increase the voltage value output by the analog power supply terminal 706 of the power management module 70; the analog ground terminal 709 and the fault detection terminal 7010 of the power management module 70 are both grounded.

[0040] In some embodiments, the types of electronic devices include household appliances, office equipment, medical equipment, industrial equipment, consumer electronic equipment, entertainment equipment, navigation equipment, etc., among which household appliances include refrigerators, washing machines, televisions, air conditioners, etc.; office equipment includes fax machines, printers, copiers, projectors, etc.; medical equipment includes digital X-ray machines, electrocardiographs, ultrasonic diagnostic equipment, etc.; industrial equipment includes electronic control equipment in automated production lines, programmable logic controllers (PLCs), sensors, etc.; consumer electronic devices include mobile phones, tablets, personal computers (PCs), smart watches, etc.; entertainment equipment includes audio equipment, digital versatile disc (DVD) players, game consoles (such as PlayStation, Xbox), etc.; navigation equipment includes smart car systems, global positioning system (GPS) navigators, etc.

[0041] In the related art, when the power level of the power supply in an electronic device is too low, the supply voltage of the power management module is reduced, resulting in a reduction in the load capacity of the output current of the power management module, which reduces the brightness of the display screen, thus causing poor stability of the display screen brightness.

[0042] In an embodiment of the present application, the coprocessor 10 obtains the power of the power supply 60 of the electronic device through the main processor 80. When the power is less than or equal to the power threshold, the coprocessor 10 controls the power supply control subcircuit 20 to boost the second power supply signal of the power supply 60 and output a third power supply signal to power the power management module 70. This avoids the power supply voltage of the power management module 70 being reduced when the power of the power supply 60 is too low, resulting in a reduction in the load capacity of the output current of the power management module 70, thereby avoiding a reduction in the brightness of the display screen 90 and improving the stability of the brightness of the display screen 90.

[0043] Optional, see Figure 3 In some embodiments, the power supply control subcircuit 20 includes a first switching device Q1 and a voltage conversion unit 21; the coprocessor 10 is connected to the first switching device Q1 and the voltage conversion unit 21, respectively, and the coprocessor 10 is used to control the first switching device Q1 to be disconnected and control the voltage conversion unit 21 to operate when the power level is less than or equal to the power threshold; the first switching device Q1 is connected to the power supply 60 and the power management module 70, respectively; the voltage conversion unit 21 is connected to the power supply 60 and the power management module 70, respectively, and is used to convert the second power supply signal into the third power supply signal and output it.

[0044] In some embodiments, the first switching device Q1 may be a MOS (Metal-Oxide-Semiconductor Field-Effect Transistor), a triode, a relay, or other types of switching devices.

[0045] In some embodiments, the coprocessor 10 is also used to control the first switching device Q1 to turn on when the power level is greater than the power threshold, so as to short-circuit the voltage conversion unit 21, stop the voltage conversion unit 21 from working, and use the second power supply signal of the power supply 60 to power the power management module 70.

[0046] In an embodiment of the present application, when the power level is less than or equal to the power threshold, the coprocessor 10 controls the first switching device Q1 to be disconnected and controls the voltage conversion unit 21 to operate, and then converts the second power supply signal into a third power supply signal through the voltage conversion unit 21 and outputs it to power the power management module 70.

[0047] Optionally, in some embodiments, the voltage conversion unit 21 includes an inductor L1, a second switching device Q2 and a third switching device Q3; the first end of the inductor L1 is connected to the power supply 60, and the second end of the inductor L1 is connected to the first end of the second switching device Q2 and the first end of the third switching device Q3 respectively; the second end of the second switching device Q2 is grounded, and the control end of the second switching device Q2 is connected to the first signal end of the coprocessor 10; the second end of the third switching device Q3 is connected to the power supply end X9 of the power management module 70, and the control end of the third switching device Q3 is connected to the second signal end of the coprocessor 10; the coprocessor 10 is used to control the second switching device Q2 and the third switching device Q3 to periodically alternately turn on when the power is less than or equal to the power threshold.

[0048] In some embodiments, the second switching device Q2 includes a MOS transistor, a transistor, a relay, or other types of switching devices.

[0049] In some embodiments, the third switching device Q3 includes a MOS transistor, a transistor, a relay, or other types of switching devices.

[0050] In some embodiments, the power management module 70 has three power supply terminals X9 , namely, an analog power positive terminal 704 , an analog power negative terminal 705 , and an analog power supply terminal 706 of the power management module 70 .

[0051] In some embodiments, in the first time period of each cycle, the second switching device Q2 is turned on, the third switching device Q3 is turned off, and the power supply 60 charges the inductor L1; in the second time period of each cycle, the second switching device Q2 is turned off, the third switching device Q3 is turned on, the inductor L1 is discharged, and the power supply 60 and the inductor L1 jointly power the power management module 70, thereby boosting the second power supply signal of the power supply 60, outputting a third power supply signal, and using the third power supply signal to power the power management module 70.

[0052] In an embodiment of the present application, when the power level is less than or equal to the power threshold, the coprocessor 10 controls the second switching device Q2 and the third switching device Q3 to be periodically alternately turned on to realize the charging and discharging of the inductor L1. When the inductor L1 is discharged, the power supply 60 and the inductor L1 jointly power the power management module 70, thereby boosting the second power supply signal of the power supply 60, outputting the third power supply signal, and using the third power supply signal to power the power management module 70.

[0053] In some embodiments, the power supply control subcircuit 20 further includes a first capacitor C1, the first end of the first capacitor C1 is respectively connected to the second end of the first switching device Q1 and the second end of the third switching device Q3, and the second end of the first capacitor C1 is grounded; the first capacitor C1 is a filter capacitor.

[0054] Optionally, in some embodiments, the power supply circuit also includes an auxiliary power supply sub-circuit 30; the auxiliary power supply sub-circuit 30 is connected between the power supply control sub-circuit 20 and the power management module 70, and the auxiliary power supply sub-circuit 30 is used to receive a fourth power supply signal and a second reference voltage signal, and when the voltage of the third power supply signal output by the power supply control sub-circuit 20 is less than the voltage of the second reference voltage signal, the fourth power supply signal is boosted and a fifth power supply signal is output to power the power management module 70.

[0055] In some embodiments, when the power level is less than or equal to the power threshold, the third power supply signal output by the power supply control subcircuit 20 is the third power supply signal; when the power level is greater than the power threshold, the third power supply signal output by the power supply control subcircuit 20 is the second power supply signal of the power supply 60.

[0056] In some embodiments, the auxiliary power supply subcircuit 30 is also used to output a seventh power supply signal when the voltage of the third power supply signal output by the power supply control subcircuit 20 is greater than the voltage of the second reference voltage signal, and the voltage of the seventh power supply signal is equal to the voltage of the third power supply signal output by the power supply control subcircuit 20.

[0057] When the voltage of the third power supply signal output by the power supply control subcircuit 20 is lower than the voltage of the second reference voltage signal, it indicates that the voltage of the third power supply signal output by the power supply control subcircuit 20 is lower than the under-voltage protection threshold of the power management module 70. When the voltage of the third power supply signal output by the power supply control subcircuit 20 is used to power the power management module 70, the under-voltage lockout (UVLO) of the power management module 70 will be triggered. When the voltage of the third power supply signal output by the power supply control subcircuit 20 is higher than the voltage of the second reference voltage signal, it indicates that the voltage of the third power supply signal output by the power supply control subcircuit 20 is higher than the under-voltage protection threshold of the power management module 70. When the voltage of the third power supply signal output by the power supply control subcircuit 20 is used to power the power management module 70, the under-voltage lockout (UVLO) of the power management module 70 will not be triggered.

[0058] In some embodiments, the auxiliary power supply subcircuit 30 is connected to a voltage conversion chip of the electronic device, and the voltage conversion chip is connected to the power supply 60 . The voltage conversion chip converts the power supply signal of the power supply 60 into a fourth power supply signal and outputs it to the auxiliary power supply subcircuit 30 .

[0059] In an embodiment of the present application, the fourth power supply signal is received by the auxiliary power supply sub-circuit 30, and when the voltage of the third power supply signal output by the power supply control sub-circuit 20 is less than the voltage of the second reference voltage signal, the fourth power supply signal is boosted and a fifth power supply signal is output to power the power management module 70.

[0060] Optionally, in some embodiments, the auxiliary power supply sub-circuit 30 includes a second operational amplifier P2, a voltage detection module 31 and a charge pump module 32; the non-inverting input terminal and the positive pole of the second operational amplifier P2 are respectively connected to the output terminal of the power supply control sub-circuit 20, the inverting input terminal of the second operational amplifier P2 is used to receive a second reference voltage signal, and the output terminal of the second operational amplifier P2 is respectively connected to the detection terminal of the voltage detection module 31 and the power supply terminal X9 of the power management module 70; the voltage detection module 31 is connected to the charge pump module 32; the charge pump module 32 is connected to the power management module 70.

[0061] In some embodiments, the second reference voltage signal is provided by a voltage conversion chip of the electronic device, wherein the inverting input terminal of the second operational amplifier P2 is connected to the voltage conversion chip.

[0062] In some embodiments, the voltage of the second reference voltage signal is equal to the sum of the undervoltage protection threshold and the preset margin value. For example, the undervoltage protection threshold is 2.5 volts, the preset margin value is 0.5 volts, and the voltage of the second reference voltage signal is 3 volts.

[0063] In some embodiments, the output end of the second operational amplifier P2 is respectively connected to the analog power input end 701, the reference power input end 702 and the power power input end 703 of the power management module 70, and the output end of the charge pump module 32 is respectively connected to the analog power input end 701, the reference power input end 702 and the power power input end 703 of the power management module 70.

[0064] In some embodiments, the auxiliary power supply sub-circuit 30 further includes a second capacitor C2 , a first end of the second capacitor C2 is connected to the output end of the second operational amplifier P2 , and a second end of the second capacitor C2 is grounded.

[0065] In the embodiment of the present application, the negative electrode of the second operational amplifier P2 (i.e., the voltage input terminal of the negative power supply 60) is grounded. Since the non-inverting input terminal and the positive electrode of the second operational amplifier P2 are respectively connected to the output terminal of the power supply control sub-circuit 20, the inverting input terminal of the second operational amplifier P2 is used to receive the second reference voltage signal, and the output terminal of the second operational amplifier P2 is respectively connected to the detection terminal of the voltage detection module 31 and the power supply terminal X9 of the power management module 70, the second operational amplifier P2 is in an open-loop state. When the voltage of the non-inverting input terminal of the second operational amplifier P2 is greater than the voltage of the inverting input terminal of the second operational amplifier P2, the voltage of the output signal of the output terminal of the second operational amplifier P2 approaches the voltage of the positive electrode of the second operational amplifier P2 (i.e., the voltage input terminal of the positive power supply 60). The voltage of the positive electrode of the second operational amplifier P2 is the voltage of the third power supply signal output by the power supply control sub-circuit 20, and the output terminal of the second operational amplifier P2 is a high level. In an approximate case, it can be considered that the voltage of the output signal of the output terminal of the second operational amplifier P2 is equal to the voltage of the positive electrode of the second operational amplifier P2.

[0066] When the voltage at the inverting input terminal of the second operational amplifier P2 is greater than the voltage at the non-inverting input terminal of the second operational amplifier P2, the voltage of the output signal at the output terminal of the second operational amplifier P2 approaches the voltage of the cathode of the second operational amplifier P2, that is, 0 volts, and the output terminal of the second operational amplifier P2 is at a low level; in the approximate case, it can be considered that the voltage of the output signal at the output terminal of the second operational amplifier P2 is equal to the voltage of the cathode of the second operational amplifier P2.

[0067] In some embodiments, the second power supply signal is input to the input terminal X4 of the power supply control sub-circuit 20 (i.e., the first terminal of the first switching device Q1 and the first terminal of the inductor L1); the third power supply signal is input to the first input terminal X5 of the auxiliary power supply sub-circuit 30 (i.e., the non-inverting input terminal of the second operational amplifier P2); the fourth power supply signal is input to the second input terminal X6 of the auxiliary power supply sub-circuit 30 (i.e., the input terminal of the charge pump module 32); the second reference voltage signal is input to the third input terminal X7 of the auxiliary power supply sub-circuit 30 (i.e., the inverting input terminal of the second operational amplifier P2); the fifth power supply signal is input to the power supply terminal X9 of the power management module 70; and the sixth power supply signal is input to the input terminal X8 of the voltage detection module 31.

[0068] Optionally, in some embodiments, the second operational amplifier P2 is used to output a sixth power supply signal when the voltage of the third power supply signal output by the power supply control subcircuit 20 is less than the voltage of the second reference voltage signal; the sixth power supply signal is less than or equal to the voltage threshold; the voltage detection module 31 is used to control the charge pump module 32 to operate when the second operational amplifier P2 outputs the sixth power supply signal; the charge pump module 32 is used to receive the fourth power supply signal, and when operating, convert the fourth power supply signal into the fifth power supply signal and output it.

[0069] In some embodiments, the second operational amplifier P2 is further configured to output a seventh power supply signal when the voltage of the third power supply signal output by the power supply control subcircuit 20 is greater than the voltage of the second reference voltage signal; and the seventh power supply signal is greater than the voltage threshold.

[0070] In some embodiments, the voltage of the sixth power supply signal is equal to the voltage of the cathode of the second operational amplifier P2 ; and the voltage threshold is greater than or equal to the voltage of the cathode of the second operational amplifier P2 .

[0071] In some embodiments, the voltage of the seventh power supply signal is equal to the voltage of the third power supply signal output by the power supply control sub-circuit 20 .

[0072] In some embodiments, the seventh power supply signal is input into the power supply terminal X9 of the power management module 70 .

[0073] In some embodiments, the voltage of the fifth power supply signal is greater than or equal to a preset voltage value.

[0074] In some embodiments, the voltage of the fifth power signal is equal to the product of the voltage of the fourth power signal and 2. For example, the voltage of the fourth power signal is 1.8 volts, and the voltage of the fifth power signal is 3.6 volts.

[0075] In some embodiments, the charge pump module 32 is connected to a voltage conversion chip of the electronic device, the voltage conversion chip is connected to the power supply 60 , and the voltage conversion chip converts the power supply signal of the power supply 60 into a fourth power supply signal and outputs it to the charge pump module 32 .

[0076] In an embodiment of the present application, when the voltage of the third power supply signal output by the power supply control subcircuit 20 is less than the voltage of the second reference voltage signal, the second operational amplifier P2 outputs the sixth power supply signal, and then the voltage detection module 31 controls the charge pump module 32 to operate when the second operational amplifier P2 outputs the sixth power supply signal. Then, the charge pump module 32 receives the fourth power supply signal, and when operating, converts the fourth power supply signal into a fifth power supply signal and outputs it to power the power management module 70.

[0077] Reference Figure 5 In some embodiments, the voltage of the second reference voltage signal is 3 volts, and the voltage of the fifth power supply signal is 3.6 volts. In a coordinate system with voltage U as the vertical axis and time t as the horizontal axis, curve U1 is a curve of the voltage of the power supply terminal X9 of the power management module 70, and curve U2 is a curve of the voltage of the third power supply signal output by the power supply control subcircuit 20. When the voltage of the third power supply signal output by the power supply control subcircuit 20 is greater than the voltage of the second reference voltage signal, the voltage of the power supply terminal X9 of the power management module 70 is equal to the voltage of the third power supply signal output by the power supply control subcircuit 20, that is, curve U1 coincides with curve U2. When the voltage of the third power supply signal output by the power supply control subcircuit 20 is less than the voltage of the second reference voltage signal, the voltage of the power supply terminal X9 of the power management module 70 is equal to the voltage of the fifth power supply signal.

[0078] Optionally, in some embodiments, the power supply circuit further includes an acquisition subcircuit 40 and a comparison subcircuit 50; the acquisition subcircuit 40 is connected to the comparison subcircuit 50, and the acquisition subcircuit 40 is respectively connected to the power management module 70 and the display screen 90, and acquires the first power supply signal sent by the power management module 70 to the display screen 90, and converts the first power supply signal into a first voltage signal and outputs it; the comparison subcircuit 50 is connected to the coprocessor 10, and the comparison subcircuit 50 is connected to the power management module 70, and receives a first reference voltage signal, and outputs the first voltage signal when the voltage of the first voltage signal is greater than the voltage of the first reference voltage signal; the coprocessor 10 is used to obtain an initial current value of the first power supply signal according to the first voltage signal, and generate a control instruction according to the initial current value, so that the main processor 80 controls the power management module 70 according to the control instruction according to the voltage increase amount corresponding to the initial current value, and increases the voltage of the first power supply signal.

[0079] In some embodiments, there is impedance in the line between the DDIC and the power management module 70, and the impedance causes a voltage drop, that is, due to the impedance, the voltage of the power supply signal received by the DDIC is lower than the voltage of the power supply signal output by the power management module 70. In order to eliminate the voltage drop caused by the impedance, the voltage of the first power supply signal output by the power management module 70 can be boosted.

[0080] In some embodiments, when the initial current value of the first power signal outputted by the analog power positive terminal 704 of the power management module 70 is less than the current threshold, the voltage drop caused by the impedance is less than the voltage drop threshold and can be ignored. At this time, the voltage of the power signal received by the DDIC is greater than or equal to the minimum power supply voltage, and the display screen 90 is powered by the voltage of the power signal outputted by the power management module 70, and the brightness of the display screen 90 is maintained at a normal brightness value.

[0081] In some embodiments, the minimum supply voltage is 4.5V.

[0082] In the related art, when the initial current value of the first power supply signal output from the positive terminal of the analog power supply of the power management module is greater than or equal to the current threshold, the voltage drop caused by the impedance is greater than or equal to the voltage drop threshold. At this time, the voltage of the power supply signal received by the DDIC is less than the minimum power supply voltage. The voltage of the power supply signal output by the power management module is used to power the display screen, and the brightness of the display screen is an abnormal brightness value, which causes the brightness of the display screen to decrease, resulting in poor stability of the brightness of the display screen.

[0083] In some embodiments, the comparison subcircuit 50 is also used to output a second voltage signal when the voltage of the first voltage signal is less than the voltage of the first reference voltage signal; the voltage of the second voltage signal is less than the voltage of the first voltage signal, and the coprocessor 10 determines that the initial current value of the first power supply signal is less than the current threshold when obtaining the second voltage signal.

[0084] In some embodiments, when the voltage of the first voltage signal is greater than the voltage of the first reference voltage signal, it indicates that the initial current value of the first power supply signal is greater than or equal to the current threshold; when the voltage of the first voltage signal is less than the voltage of the first reference voltage signal, it indicates that the initial current value of the first power supply signal is less than the current threshold.

[0085] In some embodiments, the coprocessor 10 stores a preset correspondence between a reference current value and a reference voltage increase. The coprocessor 10 is used to obtain the voltage increase corresponding to the initial current value based on the preset correspondence between the reference current value and the reference voltage increase, and generate a control instruction to increase the voltage of the first power supply signal according to the voltage increase; the main processor 80 forwards the control instruction to the DDIC, and the DDIC controls the power management module 70 to increase the voltage of the first power supply signal according to the voltage increase corresponding to the initial current value by sending a first feedback signal to the power management module 70; wherein, the reference current value is positively correlated with the reference voltage increase, and the initial current value is positively correlated with the voltage increase.

[0086] In some embodiments, in a preset correspondence between reference current values ​​and reference voltage increases, the reference current values ​​are arranged in order of size, and the reference voltage increases are arranged in the order of arrangement of the reference current values. The first difference between adjacent reference current values ​​is the same, and the second difference between adjacent reference voltage increases is the same, so that the voltage of the first power supply signal increases by the second difference every time the initial current value of the first power supply signal increases by the first difference; for example, the difference between adjacent reference current values ​​is 50 mA, and the difference between adjacent reference voltage increases is 50 mV.

[0087] In some embodiments, after the voltage of the first power supply signal is increased by the second difference, the current value of the first power supply signal increases to compensate for the voltage drop caused by the impedance, which causes the brightness of the display screen 90 to decrease; when the voltage of the first power supply signal is increased by the second difference, the voltage of the power supply signal received by the DDIC is greater than or equal to the minimum power supply voltage, and the new voltage of the first power supply signal output by the power management module 70 is used to power the display screen 90, and the brightness of the display screen 90 is maintained at a normal brightness value.

[0088] In the embodiment of the present application, the acquisition subcircuit 40 acquires the first power supply signal sent by the power management module 70 to the display screen 90, converts the first power supply signal into a first voltage signal, and outputs the first voltage signal. The comparison subcircuit 50 then receives the first reference voltage signal and outputs the first voltage signal when the voltage of the first voltage signal is greater than the voltage of the first reference voltage signal. The coprocessor 10 then obtains an initial current value of the first power supply signal based on the first voltage signal and generates a control instruction based on the initial current value. The main processor 80 controls the power management module 70 according to the control instruction to increase the voltage of the first power supply signal by a voltage increase amount corresponding to the initial current value. When the initial current value of the first power supply signal output by the power management module 70 is greater than or equal to a current threshold, the power supply voltage of the display screen 90 is boosted to offset the voltage drop caused by the impedance of the power supply line between the power management module 70 and the display screen 90. This improves the voltage stability of the power supply signal received by the display screen 90, i.e., prevents the voltage of the power supply signal received by the display screen 90 from being less than the minimum power supply voltage. This further prevents a decrease in the brightness of the display screen 90, which results in poor brightness stability of the display screen 90, and maintains the brightness of the display screen 90 at a normal brightness value.

[0089] Optional, see Figure 4 In some embodiments, the acquisition subcircuit 40 includes a first resistor R1 and an operational amplifier unit 41; the first resistor R1 is arranged on the line for the power management module 70 to supply power to the display screen 90, and the first resistor R1 is used to acquire the first power supply signal; the operational amplifier unit 41 is connected to the first resistor R1, and the operational amplifier unit 41 is used to amplify the voltage of the first resistor R1 and output the first voltage signal.

[0090] In some embodiments, a first end of the first resistor R1 is connected to the analog power positive terminal 704 of the power management module 70 , and a second end of the first resistor R1 is connected to the positive electrode of the DDIC.

[0091] In some embodiments, the operational amplifier unit 41 includes a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a third operational amplifier P3, wherein the first end of the second resistor R2 is connected to the first end of the first resistor R1, and the second end of the second resistor R2 is connected to the non-inverting input terminal of the third operational amplifier P3; the first end of the third resistor R3 is connected to the second end of the first resistor R1, and the second end of the third resistor R3 is connected to the inverting input terminal of the third operational amplifier P3; the first end of the fourth resistor R4 is connected to the output terminal of the third operational amplifier P3, and the second end of the fourth resistor R4 is connected to the inverting input terminal of the third operational amplifier P3; the first end of the fifth resistor R5 is connected to the non-inverting input terminal of the third operational amplifier P3, and the second end of the fifth resistor R5 is grounded; and the output terminal of the third operational amplifier P3 is connected to the first input terminal X2 (i.e., the first end of the sixth resistor R6) of the comparison sub-circuit 50.

[0092] In some embodiments, the third operational amplifier P3 is used for signal amplification and noise suppression.

[0093] In some embodiments, the resistance value of the second resistor R2 is equal to the resistance value of the third resistor R3, and the resistance value of the fourth resistor R4 is equal to the resistance value of the fifth resistor R5. When the third operational amplifier P3 is in a virtual short state, the voltage at the output terminal of the third operational amplifier P3 is:

[0094]

[0095] Wherein, Vout is the voltage at the output terminal of the third operational amplifier P3, r2 is the resistance value of the second resistor R2, r5 is the resistance value of the fifth resistor R5, V R1 is the voltage of the first resistor R1.

[0096] Then the current value of the first resistor R1, that is, the current value of the first power supply signal is:

[0097]

[0098] Wherein, I is the current value of the first power supply signal, and r1 is the resistance value of the first resistor R1.

[0099] In some embodiments, the resistance of the first resistor R1 is 1 milliohm.

[0100] In an embodiment of the present application, a first power supply signal is collected through a first resistor R1, and then the voltage of the first resistor R1 is amplified by the operational amplifier unit 41 to output a first voltage signal. Since the voltage of the first resistor R1 is equal to the product of the initial current value of the first power supply signal and the resistance value of the first resistor R1, the voltage of the first voltage signal is used to represent the initial current value of the first power supply signal. When the voltage of the first voltage signal is greater than the voltage of the first reference voltage signal, it indicates that the initial current value of the first power supply signal is greater than or equal to the current threshold.

[0101] Optionally, in some embodiments, the comparison sub-circuit 50 includes a filtering unit 51 and a first operational amplifier P1; the input end of the filtering unit 51 is connected to the output end of the acquisition sub-circuit 40, and the output end of the filtering unit 51 is respectively connected to the non-inverting input end and the positive pole of the first operational amplifier P1, and the filtering unit 51 is used to filter the first voltage signal; the output end of the first operational amplifier P1 is connected to the input end X10 of the coprocessor 10, and the inverting input end of the first operational amplifier P1 is used to receive a first reference voltage signal, and the first operational amplifier P1 is used to output the first voltage signal when the voltage of the first voltage signal is greater than the voltage of the first reference voltage signal.

[0102] In some embodiments, the inverting input terminal of the first operational amplifier P1 is connected to the analog power positive terminal 704 of the power management module 70, and the first reference voltage signal is the first power supply signal; since the first voltage signal is derived from the first power supply signal, comparing the voltage of the first voltage signal with the voltage of the first power supply signal is beneficial to eliminating the influence of the interference signal in the first power supply signal.

[0103] In some embodiments, the first operational amplifier P1 is in an open-loop state. When the voltage at the non-inverting input terminal of the first operational amplifier P1 is greater than the voltage at the inverting input terminal of the first operational amplifier P1, the voltage of the output signal at the output terminal of the first operational amplifier P1 approaches the voltage of the positive electrode of the first operational amplifier P1 (i.e., the voltage input terminal of the positive power supply 60). The voltage of the positive electrode of the first operational amplifier P1 is the voltage of the first voltage signal, and the output terminal of the first operational amplifier P1 is at a high level. In an approximate case, it can be considered that the voltage of the output signal at the output terminal of the first operational amplifier P1 is equal to the voltage of the positive electrode of the first operational amplifier P1, that is, the output terminal of the first operational amplifier P1 outputs the first voltage signal.

[0104] When the voltage at the inverting input terminal of the first operational amplifier P1 is greater than the voltage at the non-inverting input terminal of the first operational amplifier P1, the voltage of the output signal at the output terminal of the first operational amplifier P1 approaches the voltage of the cathode of the first operational amplifier P1, that is, 0 volts, and the output terminal of the first operational amplifier P1 is at a low level; in the approximate case, it can be considered that the voltage of the output signal at the output terminal of the first operational amplifier P1 is equal to the voltage of the cathode of the first operational amplifier P1.

[0105] In some embodiments, the filtering unit 51 includes a sixth resistor R6 and a third capacitor C3, the first end of the sixth resistor R6 is connected to the output end of the third operational amplifier P3, the second end of the sixth resistor R6 is respectively connected to the first end of the third capacitor C3 and the non-inverting input end of the first operational amplifier P1, and the second end of the third capacitor C3 is grounded.

[0106] In some embodiments, the cathode of the first operational amplifier P1 (ie, the voltage input terminal of the negative power supply 60 ) is grounded.

[0107] In some embodiments, the comparison sub-circuit 50 further includes a fourth capacitor C4 , a first end of which is connected to the output end of the first operational amplifier P1 , and a second end of which is grounded; the fourth capacitor C4 is a filter capacitor.

[0108] In some embodiments, the first power supply signal is input to the input terminal X1 of the acquisition sub-circuit 40 (i.e., the first end of the first resistor R1); the first voltage signal output by the acquisition sub-circuit 40 is input to the first input terminal X2 of the comparison sub-circuit 50 (i.e., the first end of the sixth resistor R6); when the voltage of the first voltage signal is greater than the voltage of the first reference voltage signal, the output terminal of the comparison sub-circuit 50 outputs the first voltage signal, and the first voltage signal output by the output terminal of the comparison sub-circuit 50 is input to the input terminal X10 of the coprocessor 10; when the voltage of the first voltage signal is less than the voltage of the first reference voltage signal, the comparison sub-circuit 50 outputs a second voltage signal, and the second voltage signal is input to the input terminal X10 of the coprocessor 10; the first reference voltage signal is input to the second input terminal X3 of the comparison sub-circuit 50 (i.e., the inverting input terminal of the first operational amplifier P1).

[0109] In an embodiment of the present application, the first voltage signal is filtered by the filtering unit 51, and then the first operational amplifier P1 outputs the first voltage signal when the voltage of the first voltage signal is greater than the voltage of the first reference voltage signal. Then, the coprocessor 10 obtains the initial current value of the first power supply signal according to the first voltage signal, and generates a control instruction based on the initial current value, so that the main processor 80 controls the power management module 70 according to the control instruction to increase the voltage of the first power supply signal according to the voltage increase amount corresponding to the initial current value.

[0110] In related technologies, the corresponding relationship between the display brightness and trace impedance of electronic devices is shown in the following table (Table 1):

[0111]

[0112] Table 1

[0113] Among them, the trace impedance is the impedance between the DDIC and the power management module. In order to achieve display brightness, the impedance between the DDIC and the power management module needs to be reduced to below the trace impedance. For example, in the related art, in order to meet the display brightness of 1800 nits, the trace impedance needs to be less than or equal to 37.09470588 milliohms. However, it is impossible to reduce the impedance between the DDIC and the power management module to 37.09470588 milliohms. Therefore, the trace impedance of 37.09470588 milliohms cannot be achieved.

[0114] In the related art, the analog power positive terminal of the power management module is far away from the connector of the display screen. When the power consumption of the display screen increases, the current value of the first power supply signal becomes larger, and the routing impedance of the analog power positive terminal of the power management module is relatively high. Otherwise, it cannot meet the lower voltage limit of 4.5 volts at the connector end of the display screen. When the voltage at the connector end is lower than 4.5 volts, the display effect of the display screen deteriorates and cannot meet the user's high brightness requirements.

[0115] In the embodiment of the present application, however, there is no limitation on the wiring impedance. The acquisition sub-circuit 40 acquires the first power supply signal sent by the power management module 70 to the display screen 90, converts the first power supply signal into a first voltage signal, and outputs the first voltage signal. The comparison sub-circuit 50 then outputs the first voltage signal when the voltage of the first voltage signal is greater than the voltage of the first reference voltage signal. The coprocessor 10 then obtains an initial current value of the first power supply signal based on the first voltage signal and generates a control instruction based on the initial current value. The main processor 80 controls the power management module 70 according to the control instruction to increase the voltage of the first power supply signal according to the voltage increase amount corresponding to the initial current value. Thus, when the brightness value of the display screen 90 is greater than the brightness threshold, the supply voltage of the display screen 90 is boosted to offset the voltage drop caused by the line impedance between the power management module 70 and the display screen 90, thereby avoiding abnormal brightness values ​​of the display screen 90 and maintaining the brightness of the display screen 90 at a normal brightness value, ensuring the feasibility of planning a high-brightness screen and meeting the high brightness requirements of users.

[0116] In an embodiment of the present application, a peripheral power supply circuit for adaptively adjusting the PMIC drive is constructed, so that a stable voltage is input to the PMIC at different power levels, and different voltages are output by the PMIC at different brightness levels; through the power supply control sub-circuit 20, after identifying that the power level is lower than the power threshold, the second power supply signal of the power supply 60 is boosted to maintain a stable voltage input to the PMIC, thereby ensuring the output capacity of the PMIC; through the acquisition sub-circuit 40 and the comparison sub-circuit 50, when it is identified that the brightness is increased and the initial current value of the first power supply signal is greater than the current threshold, the control instruction is forwarded to the DDIC through the main processor 80, and the DDIC sends a first feedback signal to the power management module 70 to control the power management module 70 to increase the voltage of the first power supply signal according to the voltage increase amount corresponding to the initial current value.

[0117] Through the embodiments of the present application, the limitation problem caused by high impedance requirements in screen planning projects is solved, the user's high brightness needs are met, and the pain point of high brightness display is no longer restricted in low power scenarios, thereby improving the user experience.

[0118] In summary, in the embodiment of the present application, the acquisition subcircuit 40 acquires the first power supply signal sent by the power management module 70 to the display screen 90, converts the first power supply signal into a first voltage signal, and outputs the first voltage signal. The comparison subcircuit 50 then receives the first reference voltage signal and outputs the first voltage signal when the voltage of the first voltage signal is greater than the voltage of the first reference voltage signal. The coprocessor 10 then obtains an initial current value of the first power supply signal based on the first voltage signal and generates a control instruction based on the initial current value, so that the main processor 80 controls the power management module 70 according to the control instruction to increase the voltage of the first power supply signal according to the voltage increase amount corresponding to the initial current value. Thus, when the initial current value of the first power supply signal output by the power management module 70 is greater than or equal to the current threshold, the power supply voltage of the display screen 90 is boosted to offset the voltage drop caused by the impedance of the power supply line between the power management module 70 and the display screen 90, thereby improving the voltage stability of the power supply signal received by the display screen 90. That is, the voltage of the power supply signal received by the display screen 90 is prevented from being less than the minimum power supply voltage, thereby preventing the brightness of the display screen 90 from decreasing and causing poor brightness stability of the display screen 90.

[0119] Figure 6 This is a flowchart of a power supply method provided by an embodiment of the present application. Figure 6 As shown, the method may include:

[0120] Step 101: Acquire a first power supply signal sent by a power management module of an electronic device to a display screen of the electronic device, and convert the first power supply signal into a first voltage signal.

[0121] The implementation of this step is similar to the previous implementation process and will not be repeated here.

[0122] Step 102 : When the voltage of the first voltage signal is greater than the voltage of the first reference voltage signal, obtain an initial current value of the first power supply signal according to the first voltage signal.

[0123] The implementation of this step is similar to the previous implementation process and will not be repeated here.

[0124] Step 103 : According to a preset correspondence between a reference current value and a reference voltage increase, obtain a voltage increase corresponding to the initial current value, and increase the voltage of the first power supply signal according to the voltage increase.

[0125] The implementation of this step is similar to the previous implementation process and will not be repeated here.

[0126] In some embodiments, the method further comprises the steps of:

[0127] Step 104 : When the voltage of the first voltage signal is less than the voltage of the first reference voltage signal, determine that the initial current value of the first power supply signal is less than the current threshold.

[0128] The implementation of this step is similar to the previous implementation process and will not be repeated here.

[0129] In an embodiment of the present application, a first power supply signal sent by a power management module to a display screen is obtained, and the first power supply signal is converted into a first voltage signal. Then, when the voltage of the first voltage signal is greater than the voltage of a first reference voltage signal, an initial current value of the first power supply signal is obtained according to the first voltage signal. Then, according to a preset correspondence between a reference current value and a reference voltage increase, a voltage increase corresponding to the initial current value is obtained, and the voltage of the first power supply signal is increased according to the voltage increase. Thus, when the brightness value of the display screen is greater than a brightness threshold, the power supply voltage of the display screen is boosted to offset the voltage drop caused by the line impedance between the power management module and the display screen, thereby improving the voltage stability of the power supply signal received by the display screen, that is, avoiding the brightness of the display screen from being an abnormal brightness value, so that the brightness of the display screen remains at a normal brightness value.

[0130] Optionally, in some embodiments, the method further comprises the following steps:

[0131] Step 105: Obtain the power level of the power supply of the electronic device.

[0132] The implementation of this step is similar to the previous implementation process and will not be repeated here.

[0133] Step 106: When the power level is less than or equal to the power level threshold, boost the second power supply signal of the power supply to obtain a third power supply signal, and use the third power supply signal to power the power management module.

[0134] The implementation of this step is similar to the previous implementation process and will not be repeated here.

[0135] In some embodiments, the method further comprises the steps of:

[0136] Step 107: When the power level is greater than the power threshold, use the second power supply signal to supply power to the power management module.

[0137] The implementation of this step is similar to the previous implementation process and will not be repeated here.

[0138] In an embodiment of the present application, the power level of the power supply of the electronic device is obtained, and then when the power level is less than or equal to the power level threshold, the second power supply signal of the power supply is boosted to obtain a third power supply signal, and the third power supply signal is used to power the power management module. This avoids the situation where the power level of the power supply is too low, thereby avoiding a reduction in the load capacity of the output current of the power management module due to a reduction in the supply voltage of the power management module, thereby avoiding a reduction in the brightness of the display screen and improving the stability of the brightness of the display screen.

[0139] An embodiment of the present application also provides an electronic device, including a power supply circuit as described above, or steps for implementing the power supply method as described above. The specific implementation process is similar to the above and will not be repeated here.

[0140] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0141] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), including a number of instructions for enabling a terminal (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0142] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A power supply circuit, characterized in that: include: Coprocessor, acquisition subcircuit and comparison subcircuit; The acquisition subcircuit is connected to the comparison subcircuit, and the acquisition subcircuit is respectively connected to the power management module and the display screen of the electronic device, and acquires a first power supply signal sent by the power management module to the display screen, and converts the first power supply signal into a first voltage signal and outputs the first voltage signal; The comparison subcircuit is connected to the coprocessor, the comparison subcircuit is connected to the power management module, and receives a first reference voltage signal, and outputs the first voltage signal when the voltage of the first voltage signal is greater than the voltage of the first reference voltage signal; The coprocessor is used to obtain an initial current value of the first power supply signal based on the first voltage signal, and generate a control instruction based on the initial current value, so that the main processor of the electronic device can control the power management module to increase the voltage of the first power supply signal according to the voltage increase amount corresponding to the initial current value according to the control instruction.

2. The power supply circuit according to claim 1, wherein: The acquisition subcircuit includes a first resistor and an operational amplifier unit; The first resistor is provided on a circuit through which the power management module supplies power to the display screen, and the first resistor is used to collect the first power supply signal; The operational amplifier unit is connected to the first resistor, and is used to amplify the voltage of the first resistor and output the first voltage signal.

3. The power supply circuit according to claim 1, wherein: The comparison sub-circuit includes a filtering unit and a first operational amplifier; The input end of the filtering unit is connected to the output end of the acquisition sub-circuit, and the output end of the filtering unit is respectively connected to the non-inverting input end and the positive electrode of the first operational amplifier, and the filtering unit is used to filter the first voltage signal; The output end of the first operational amplifier is connected to the input end of the coprocessor, the inverting input end of the first operational amplifier is used to receive a first reference voltage signal, and the first operational amplifier is used to output the first voltage signal when the voltage of the first voltage signal is greater than the voltage of the first reference voltage signal.

4. The power supply circuit according to claim 1, wherein: The power supply circuit also includes a power supply control subcircuit; The coprocessor is connected to the power supply control subcircuit, and the coprocessor is connected to the main processor, and is used to obtain the power level of the power supply of the electronic device through the main processor, and when the power level is less than or equal to the power threshold, control the power supply control subcircuit to boost the second power supply signal of the power supply and output a third power supply signal to power the power management module; the power supply control subcircuit is respectively connected to the power supply and the power management module.

5. The power supply circuit according to claim 4, characterized in that: The power supply control subcircuit includes a first switching device and a voltage conversion unit; The coprocessor is connected to the first switching device and the voltage conversion unit respectively, and the coprocessor is used to control the first switching device to be disconnected and control the voltage conversion unit to operate when the power level is less than or equal to the power threshold; The first switching device is connected to the power supply and the power management module respectively; the voltage conversion unit is connected to the power supply and the power management module respectively, and is used to convert the second power supply signal into the third power supply signal and output it.

6. The power supply circuit according to claim 5, characterized in that: The voltage conversion unit includes an inductor, a second switching device and a third switching device; The first end of the inductor is connected to the power supply, and the second end of the inductor is connected to the first end of the second switching device and the first end of the third switching device respectively; The second terminal of the second switch device is grounded, and the control terminal of the second switch device is connected to the first signal terminal of the coprocessor; The second end of the third switch device is connected to the power supply end of the power management module, and the control end of the third switch device is connected to the second signal end of the coprocessor; The coprocessor is configured to control the second switching device and the third switching device to be periodically and alternately turned on when the power level is less than or equal to the power threshold.

7. The power supply circuit according to claim 4, characterized in that: The power supply circuit also includes an auxiliary power supply circuit; The auxiliary power supply subcircuit is connected between the power supply control subcircuit and the power management module. The auxiliary power supply subcircuit is used to receive a fourth power supply signal and a second reference voltage signal, and when the voltage of the third power supply signal output by the power supply control subcircuit is less than the voltage of the second reference voltage signal, the auxiliary power supply subcircuit boosts the fourth power supply signal and outputs a fifth power supply signal to power the power management module.

8. The power supply circuit according to claim 7, characterized in that: The auxiliary power supply circuit includes a second operational amplifier, a voltage detection module and a charge pump module; The non-inverting input terminal and the positive electrode of the second operational amplifier are respectively connected to the output terminal of the power supply control sub-circuit, the inverting input terminal of the second operational amplifier is used to receive the second reference voltage signal, and the output terminal of the second operational amplifier is respectively connected to the detection terminal of the voltage detection module and the power supply terminal of the power management module; The voltage detection module is connected to the charge pump module; The charge pump module is connected to the power management module.

9. The power supply circuit according to claim 8, characterized in that: The second operational amplifier is configured to output a sixth power supply signal when the voltage of the third power supply signal output by the power supply control subcircuit is less than the voltage of the second reference voltage signal; the sixth power supply signal is less than or equal to a voltage threshold; The voltage detection module is used to control the charge pump module to operate when the second operational amplifier outputs a sixth power supply signal; The charge pump module is used to receive the fourth power supply signal, and when in operation, convert the fourth power supply signal into the fifth power supply signal and output the fifth power supply signal.

10. A power supply method, characterized in that: The method comprises: Acquire a first power supply signal sent by a power management module of the electronic device to a display screen of the electronic device, and convert the first power supply signal into a first voltage signal; When the voltage of the first voltage signal is greater than the voltage of the first reference voltage signal, obtaining an initial current value of the first power supply signal according to the first voltage signal; According to a preset correspondence between a reference current value and a reference voltage increase, a voltage increase corresponding to the initial current value is obtained, and the voltage of the first power supply signal is increased according to the voltage increase.

11. The method according to claim 10, characterized in that The method further comprises: Obtaining the power level of the power supply of the electronic device; When the power level is less than or equal to the power threshold, the second power supply signal of the power supply is boosted to obtain a third power supply signal, and the third power supply signal is used to power the power management module.

12. An electronic device, characterized in that: The method comprises the power supply circuit according to any one of claims 1 to 9, or the steps of implementing the power supply method according to claim 10 or 11.

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