Power supply apparatus for organic light-emitting diode screen, control method for power supply apparatus, and electronic device

Abstract

A power supply apparatus for an OLED screen (30), a control method for the power supply apparatus, and an electronic device. The power supply apparatus comprises an inductance selection module (110), a buck-boost control module (120), an inductance control module (140) and a voltage compensation and stabilization module (130), wherein the inductance selection module (110) is configured to select paths having different inductance values; the buck-boost control module (120) is configured to output to the OLED screen (30) an output voltage that is lower than or higher than an input voltage; the inductance control module (140) is configured to control the inductance selection module (110) to select a target path, and transmit power supply loop parameters to the buck-boost control module (120); and the voltage compensation and stabilization module (130) is configured to maintain the stability of a transient output voltage when the inductance selection module (110) performs switch tube switching. The inductance selection module (110) can adjust paths having different inductance values, so that the operating efficiency of the OLED screen (30) can be improved, and thus the power consumption of the screen and the heating conditions of an electronic device can be reduced, thereby realizing high-efficiency power supply.

Description

Power supply device for organic light emitting diode screen and control method thereof, and electronic device

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on March 8, 2024, with application number 202410264723.6, and priority to the Chinese patent application entitled “Power supply device for organic light-emitting diode screen, control method thereof, and electronic device”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of electronic equipment, and more specifically, to a power supply device for an organic light emitting diode screen, a control method thereof, and an electronic device. Background Art

[0003] A power management integrated circuit (PMIC) is a power supply circuit in electronic devices that is responsible for the conversion, distribution, detection and other power management of electrical energy. PMIC can be understood as a screen power supply unit (or screen power supply device), which can provide the screen with backlight and display-related power requirements.

[0004] For organic light-emitting diode (OLED) screens, the internal modules of the PMIC include a boost circuit (also called a boost circuit) and a buck-boost inverter circuit (also called a buck-boost inverter circuit). Through the buck and boost circuits, a negative voltage is formed at the display voltage common node (electroluminescent voltage series, ELVSS), and the display voltage output (electroluminescent voltage drain, ELVDD) and analog voltage output (analog voltage drain, AVDD) are higher than the system power supply voltage. Among them, ELVSS and ELVDD power the screen display pixel circuit, and AVDD provides power to the analog circuit part inside the screen.

[0005] The efficiency of a boost circuit is dependent on the inductor selection and the boost switching frequency. Achieving high conversion efficiency for different load currents requires matching inductors with different inductance parameters. Currently, PMICs offer only one boost inductance value. When the inductor value is fixed, the load current vs. power efficiency curve remains constant. Therefore, users cannot switch the inductor value, preventing them from operating within the screen's efficient operating range. This results in higher screen power consumption and increased heat generation in electronic devices. Summary of the Invention

[0006] The present application provides a power supply device for an organic light-emitting diode (OLED) screen, a control method thereof, and an electronic device, which can provide paths with different inductances and can adjust the inductance values ​​on different paths so that the screen can operate within an efficient working range, thereby reducing the power consumption of the screen and the heat generation of the electronic device, and achieving high-efficiency power supply.

[0007] In a first aspect, a power supply device for an organic light-emitting diode (OLED) screen is provided, comprising: an inductor selection module, a buck-boost control module, an inductor control module, and a voltage compensation stabilization module. The inductor selection module is configured to control the switching of a switch tube to select a path with different inductance values; the buck-boost control module is electrically connected to the inductor selection module and configured to output an output voltage lower or higher than an input voltage to the OLED screen; the inductor control module is communicatively connected to the inductor selection module and configured to control the inductor selection module to select a path corresponding to a target inductance value; the inductor control module is also communicatively connected to the buck-boost control module and configured to transmit power supply loop parameters to the buck-boost control module to maintain the stability of the output voltage; and the voltage compensation stabilization module is electrically connected to the buck-boost control module and is located at the output end of the buck-boost control module and configured to maintain the stability of the transient output voltage of the inductor selection module when the switch tube is switched.

[0008] The inductor control module includes a system-on-chip (SOC) or a microcontroller unit (MCU). The buck-boost control module can be used to output ELVDD, ELVSS, and AVDD power supplies to the OLED screen.

[0009] Exemplarily, the inductor control module can send control signals to the inductor selection module and the buck-boost control module, wherein the signal sent to the inductor selection module can be a digital signal (such as 0, 1), and the specific sending of 1 or 0 is determined by the inductor control module (SOC or MCU) based on the brightness of the OLED screen or the load current. The control signal sent to the buck-boost control module can carry power supply loop parameters, which can include the switching rate, switching frequency, and switch drive current size within the buck-boost control module, as well as loop monitoring threshold parameters. The above parameters are all parameters within the buck-boost control module, not parameters of external devices, and are unrelated to the switch tube in the inductor selection module.

[0010] It should be understood that the purpose of transmitting the power supply loop parameters is to prevent inductor saturation after switching the inductor, thereby avoiding inductor burnout. It also prevents the circuit from operating at the new inductance value, which could cause an open loop and unstable operation, and avoids large and abnormal voltage fluctuations. In other words, the inductor control module is designed to simultaneously control the switching of circuit control parameters (i.e., power supply loop parameters) during inductor switching, improving loop stability and operating efficiency.

[0011] In an embodiment of the present application, by designing an inductance selection module, a buck-boost control module, an inductance control module and a voltage compensation stabilization module, paths with different inductances can be provided, and the inductance values ​​on different paths can be adjusted, so that the screen can operate within an efficient working range at different screen brightnesses, thereby reducing the power consumption of the screen and the heat generation of the electronic equipment, and achieving high-efficiency power supply.

[0012] In one possible implementation, the inductor selection module includes multiple parallel paths, and each parallel path includes multiple inductors and multiple switching tubes, wherein the multiple inductors include a first inductor and a second inductor, and the multiple switching tubes include a first switching tube and a second switching tube. The first inductor and the second inductor are arranged in parallel, the inductance value of the first inductor is different from the inductance value of the second inductor, and the first switching tube and the second switching tube are respectively located at both ends of the first inductor and the second inductor.

[0013] Exemplarily, in response to the brightness (or load current) of the OLED screen being less than or equal to a first threshold (i.e., the OLED screen operates in the high-efficiency working range corresponding to the first inductor), the inductor control module is used to control the inductor selection module to switch to the first path corresponding to the first inductor, and transmit the power supply loop parameters corresponding to the first path to the buck-boost control module, the inductor selection module is used to connect the first switching tube and the second switching tube to the two ends of the first inductor, and the buck-boost control module is used to adjust the power supply loop parameters to the power supply loop parameters corresponding to the first path.

[0014] In response to the brightness (or load current) of the OLED screen being greater than the first threshold (i.e., the OLED screen operates in the high-efficiency operating range corresponding to the second inductor), the inductor control module is used to control the inductor selection module to switch to the second path corresponding to the second inductor, and transmit the power supply loop parameters corresponding to the second path to the buck-boost control module. The inductor selection module is used to connect the first switching tube and the second switching tube to the two ends of the second inductor, and the buck-boost control module is used to adjust the power supply loop parameters to the power supply loop parameters corresponding to the second path.

[0015] Exemplarily, in response to the brightness (or load current) of the OLED screen being less than a first threshold value (i.e., the OLED screen operates in the high-efficiency working range corresponding to the first inductor), the inductor control module is used to control the inductor selection module to switch to the first path corresponding to the first inductor, and transmit the power supply loop parameters corresponding to the first path to the buck-boost control module. The inductor selection module is used to connect the first switching tube and the second switching tube to the two ends of the first inductor, and the buck-boost control module is used to adjust the power supply loop parameters to the power supply loop parameters corresponding to the first path.

[0016] In response to the brightness (or load current) of the OLED screen being greater than or equal to the first threshold (i.e., the OLED screen operates in the high-efficiency operating range corresponding to the second inductor), the inductor control module is used to control the inductor selection module to switch to the second path corresponding to the second inductor, and transmit the power supply loop parameters corresponding to the second path to the buck-boost control module. The inductor selection module is used to connect the first switching tube and the second switching tube to the two ends of the second inductor, and the buck-boost control module is used to adjust the power supply loop parameters to the power supply loop parameters corresponding to the second path.

[0017] In the above implementation, the inductance selection module sets a first inductor and a second inductor in parallel, and the inductance values ​​of the first inductor and the second inductor are different. The inductance control module can select different inductance paths according to the brightness of the OLED screen, so that different inductance paths can be switched under different screen brightness to improve the working efficiency of the circuit. At the same time, different power supply loop parameters can be switched according to the inductance of different paths, so as to improve the stability of the loop, and finally the screen can operate within the high-efficiency working range, thereby reducing the power consumption of the screen and the heat generation of the electronic equipment, and achieving high-efficiency power supply.

[0018] In one possible implementation, in response to the brightness (or load current) of the OLED screen being less than or equal to a first threshold (i.e., the OLED screen operates in a high-efficiency operating range corresponding to the first inductor), the inductor control module is used to: send a first signal to the inductor selection module and send a second signal to the buck-boost control module, wherein the first signal is used to instruct the inductor selection module to switch to a first path corresponding to the first inductor, and the second signal is used to instruct the buck-boost control module on power supply loop parameters corresponding to the first path; the inductor selection module is used to receive the first signal and connect the first switching tube and the second switching tube to both ends of the first inductor according to the first signal; the buck-boost control module is used to receive the second signal and adjust the power supply loop parameters to the power supply loop parameters corresponding to the first path.

[0019] In response to the brightness (or load current) of the OLED screen being greater than a first threshold (i.e., the OLED screen operates in the high-efficiency operating range corresponding to the second inductor), the inductor control module is used to: send a third signal to the inductor selection module and a fourth signal to the buck-boost switch control module, wherein the third signal is used to instruct the inductor selection module to switch to the second path corresponding to the second inductor, and the fourth signal is used to instruct the buck-boost control module on the power supply loop parameters corresponding to the second path; the inductor selection module is used to receive the third signal and connect the first switch tube and the second switch tube to the two ends of the second inductor according to the third signal; and the buck-boost control module is used to receive the fourth signal and adjust the power supply loop parameters to the power supply loop parameters corresponding to the second path.

[0020] Alternatively, in one possible implementation, in response to the brightness (or load current) of the OLED screen being less than a first threshold value (i.e., the OLED screen operates in the high-efficiency working range corresponding to the first inductor), the inductor control module is used to: send a first signal to the inductor selection module and send a second signal to the buck-boost control module, wherein the first signal is used to instruct the inductor selection module to switch to the first path corresponding to the first inductor, and the second signal is used to instruct the buck-boost control module on the power supply loop parameters corresponding to the first path; the inductor selection module is used to receive the first signal and connect the first switching tube and the second switching tube to the two ends of the first inductor according to the first signal; the buck-boost control module is used to receive the second signal and adjust the power supply loop parameters to the power supply loop parameters corresponding to the first path.

[0021] In response to the brightness (or load current) of the OLED screen being greater than or equal to a first threshold (i.e., the OLED screen operates in the high-efficiency operating range corresponding to the second inductor), the inductor control module is used to: send a third signal to the inductor selection module and a fourth signal to the buck-boost switch control module, wherein the third signal is used to instruct the inductor selection module to switch to the second path corresponding to the second inductor, and the fourth signal is used to instruct the buck-boost control module on the power supply loop parameters corresponding to the second path; the inductor selection module is used to receive the third signal and connect the first switch tube and the second switch tube to the two ends of the second inductor according to the third signal; and the buck-boost control module is used to receive the fourth signal and adjust the power supply loop parameters to the power supply loop parameters corresponding to the second path.

[0022] In the above implementation method, the inductance control module can send corresponding signals to the buck-boost switch control module and the inductance selection module respectively according to the screen brightness value, so that different inductance paths can be switched under different screen brightnesses, thereby improving the working efficiency of the circuit and improving the stability of the loop. Ultimately, the screen can operate within the high-efficiency working range, thereby reducing the power consumption of the screen and the heat generation of the electronic equipment, and achieving high-efficiency power supply.

[0023] In one possible implementation, the power supply device further includes a decoder, which is located between the inductance selection module and the inductance control module. The inductance control module sends a control signal to the inductance selection module through the decoder, and the decoder is used to reduce the use of the general input and output interface GPIO of the inductance control module.

[0024] It should be noted that when the inductor is connected in parallel, the ELVDD, ELVSS and AVDD power supplies corresponding to the OLED require corresponding multiple parallel circuits, so a large number of input and output interfaces are required. However, the GPIO resources of the inductor control module (such as SOC or MCU) are relatively scarce, and the use of GPIO can be reduced by adding decoder control.

[0025] In one possible implementation, the inductor selection module includes multiple parallel paths, and each parallel path includes multiple inductors and a third switching tube, wherein the multiple inductors include a third inductor and a fourth inductor, the third inductor and the fourth inductor are arranged in series, and the third switching tube is located between the third inductor and the fourth inductor.

[0026] In response to the brightness (or load current) of the OLED screen being less than or equal to a second threshold (i.e., when the OLED screen operates within the high-efficiency operating range corresponding to the third inductor), the inductor control module is used to control the inductor selection module to switch to the third path corresponding to the third inductor, and transmit the power supply loop parameters corresponding to the third path to the buck-boost control module. The inductor selection module is used to connect the first switch tube to the third path having the third inductor, and the buck-boost switch control module is used to adjust the power supply loop parameters to the power supply loop parameters corresponding to the third path.

[0027] In response to the brightness (or load current) of the OLED screen being greater than the second threshold value (i.e., when the OLED screen operates in the high-efficiency working range corresponding to the fifth inductor, the fifth inductor is the sum of the third inductor and the fourth inductor), the inductor control module is used to control the inductor selection module to switch to the fourth path, and transmit the power supply loop parameters corresponding to the fourth path to the buck-boost control module. The fourth path has a third inductor and a fourth inductor. The inductor selection module is used to connect the third switch tube to the fourth path, and the buck-boost control module is used to adjust the power supply loop parameters to the power supply loop parameters corresponding to the fourth path.

[0028] Alternatively, in response to the brightness (or load current) of the OLED screen being less than a second threshold value (i.e., when the OLED screen operates within the high-efficiency working range corresponding to the third inductor), the inductor control module is used to control the inductor selection module to switch to the third path corresponding to the third inductor, and transmit the power supply loop parameters corresponding to the third path to the buck-boost control module; the inductor selection module is used to connect the first switch tube to the third path having the third inductor; and the buck-boost switch control module is used to adjust the power supply loop parameters to the power supply loop parameters corresponding to the third path.

[0029] In response to the brightness (or load current) of the OLED screen being greater than or equal to the second threshold (i.e., when the OLED screen operates in the high-efficiency working range corresponding to the fifth inductor, the fifth inductor is the sum of the third inductor and the fourth inductor), the inductor control module is used to control the inductor selection module to switch to the fourth path, and transmit the power supply loop parameters corresponding to the fourth path to the buck-boost control module. The fourth path has a third inductor and a fourth inductor. The inductor selection module is used to connect the third switch tube to the fourth path, and the buck-boost control module is used to adjust the power supply loop parameters to the power supply loop parameters corresponding to the fourth path.

[0030] In the above implementation, the inductance selection module can set the inductance in series and select different paths by switching the switch tube. The inductance values ​​on different paths are different. The inductance control module can select different inductance paths according to the brightness of the OLED screen, so that different inductance paths can be switched under different screen brightness to improve the working efficiency of the circuit. At the same time, different power supply loop parameters can be switched according to the inductance of different paths, so as to improve the stability of the loop, and finally the screen can operate within the high-efficiency working range, thereby reducing the power consumption of the screen and the heat generation of the electronic equipment, and achieving high-efficiency power supply.

[0031] In a possible implementation, the voltage compensation and stabilization module includes a capacitor, and the capacitance of the capacitor is determined according to a switching speed and / or a switching duration of a switch tube of the inductance selection module.

[0032] In the above implementation, by designing an inductor compensation stabilization module, a voltage stabilization capacitor is added to the voltage output position. During the switching process, the capacitor cooperates to compensate for the voltage drop, thereby ensuring the stability of the voltage output during switching.

[0033] In a second aspect, a method for controlling power supply of an OLED screen is provided, the method including: detecting that the brightness of the screen changes from a first brightness to a second brightness, the first brightness being within a brightness range corresponding to an efficient working interval under a first path, and the first path having a first inductor; determining that the second brightness is greater than the target brightness, the target brightness is greater than the first brightness, the target brightness being the brightness corresponding to the intersection of an efficiency curve of the first path and an efficiency curve of the second path, and sending a first control signal to an inductor selection module, the first control signal being used to instruct the inductor selection module to switch the first path to a second path, the second path having a second inductor, and the second inductor having a different inductance value from the first inductor.

[0034] In an embodiment of the present application, the inductor control module (such as a SOC or MCU) can select an appropriate path to operate according to the brightness change of the OLED screen. That is, when it is determined that the brightness after the change is greater than the target brightness, and the brightness before the change is less than or equal to the target brightness, the first path is switched to the second path, and the control parameters corresponding to the first path are adjusted to the control parameters corresponding to the second path. This allows the OLED screen to operate within the efficient operating range at different screen brightness levels, thereby reducing screen power consumption and heating of the electronic device, and achieving high-efficiency power supply.

[0035] In a possible implementation, the method further includes: determining that the second brightness is greater than the target brightness, and sending a second control signal to the buck-boost control module, where the second control signal is used to indicate a power supply loop parameter corresponding to the second path.

[0036] Among them, the power supply loop parameters may include the switching rate, switching frequency, and switch drive current size inside the buck-boost control module, as well as the threshold parameters of the loop monitoring. The above parameters are all parameters inside the buck-boost control module, not parameters of external devices, and have nothing to do with the switching tube in the inductor selection module.

[0037] It should be understood that the purpose of transmitting the power supply loop parameters is to prevent inductor saturation after switching the inductor, thereby avoiding the problem of inductor burning; to prevent the circuit from operating at a new inductance value, causing the circuit to open the loop and unstable working state, and to avoid large and abnormal voltage fluctuations.

[0038] In a possible implementation, the method further includes: determining that the second brightness is less than or equal to the target brightness, and then the screen continues to operate in a high-efficiency working range corresponding to the first channel.

[0039] In an embodiment of the present application, if the inductance control module determines that the second brightness is less than or equal to the target brightness, it means that the change in screen brightness is still within the high-efficiency working range corresponding to the first path. Therefore, there is no need to adjust the inductance of the path, and the screen can still operate in a relatively efficient state.

[0040] In one possible implementation, before detecting that the brightness of the screen changes from the first brightness to the second brightness, the method further includes: detecting that the screen is initially lit, assuming that the screen is in the high-efficiency working range corresponding to the first path; determining whether the initial brightness of the screen is greater than the target brightness, and if the initial brightness of the screen is greater than the target brightness, sending the first control signal to the inductor selection module and sending the second control signal to the buck-boost control module.

[0041] In an embodiment of the present application, taking into account that a default circuit path needs to be provided to the user when the screen is initially turned on, it can be subsequently determined whether the initially provided default circuit path is the efficient working range corresponding to the current screen brightness. If so, there is no need to adjust the circuit path. If not, it is necessary to determine the efficient working range corresponding to the current screen brightness based on the user's screen brightness and adjust it to a suitable circuit path, so that the OLED screen can operate within the efficient working range at different screen brightnesses, thereby reducing screen power consumption and heating of electronic equipment, and achieving efficient power supply.

[0042] In a third aspect, an inductance control module is provided, which includes a unit of the method in the third aspect and any possible implementation thereof. Specifically, the inductance control module includes: a detection unit, a processing unit, and a transmission unit, the detection unit is used to detect that the brightness of the screen changes from a first brightness to a second brightness, the first brightness is within the brightness range corresponding to the efficient working range under the first path, and the first path has a first inductance; the processing unit is used to determine that the second brightness is greater than the target brightness, the target brightness is greater than the first brightness, and the target brightness is the brightness corresponding to the intersection of the efficiency curve of the first path and the efficiency curve of the second path; the transmission unit is used to send a first control signal to the inductance selection module, the first control signal is used to instruct the inductance selection module to switch the first path to the second path, the second path has a second inductance, and the second inductance has a different inductance value from the first inductance.

[0043] In a possible implementation, the processing unit is further used to determine that the second brightness is greater than the target brightness, and the transmission unit is further used to send a second control signal to the buck-boost control module, where the second control signal is used to indicate a power supply loop parameter corresponding to the second path.

[0044] In a possible implementation, the processing unit is further configured to determine that if the second brightness is less than or equal to the target brightness, the screen continues to operate within a high-efficiency working range corresponding to the first path.

[0045] In one possible implementation, before detecting that the brightness of the screen changes from a first brightness to a second brightness, the detection unit is further used to detect that the screen is initially lit, and it is assumed that the screen is in the high-efficiency working range corresponding to the first path; the processing unit is further used to determine whether the initial brightness of the screen is greater than the target brightness. If the initial brightness of the screen is greater than the target brightness, the transmission unit is further used to send the first control signal to the inductance selection module and send the second control signal to the buck-boost control module.

[0046] In a fourth aspect, an electronic device is provided, which includes an organic light emitting diode (OLED) display and a power supply device as in the first aspect and any possible implementation thereof, wherein the power supply device is used to supply power to the OLED display.

[0047] In a fifth aspect, an electronic device is provided, which includes a processor and a memory, the memory being used to store program instructions, and the processor being used to call the program instructions to execute the method in the second aspect and any possible implementation thereof.

[0048] In a sixth aspect, a computer program product is provided, which includes a computer program code. When the computer program code is run on a computer, the method in the second aspect and any possible implementation thereof is executed.

[0049] In a seventh aspect, a computer-readable storage medium is provided, which stores a computer program code. When the computer program code runs on a computer, the method in the second aspect and any possible implementation thereof is executed.

[0050] In an eighth aspect, a chip is provided, comprising a processor for reading instructions stored in a memory. When the processor executes the instructions, the chip implements the method in the second aspect and any possible implementation thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] FIG1 is a schematic diagram of a scenario of powering an OLED screen provided in an embodiment of the present application.

[0052] FIG2 is a topological architecture diagram of a circuit of an electronic device provided in an embodiment of the present application.

[0053] FIG3 shows a schematic diagram of an efficiency curve between load current and power supply efficiency shown in FIG2 .

[0054] FIG4 is a schematic structural diagram of an OLED screen power supply device provided in an embodiment of the present application.

[0055] FIG5 is a circuit topology diagram of an OLED screen power supply device provided in an embodiment of the present application.

[0056] FIG6 is a circuit topology diagram of another OLED screen power supply device provided in an embodiment of the present application.

[0057] FIG7 is a schematic flowchart of a method for controlling power supply of an OLED screen provided in an embodiment of the present application.

[0058] FIG8 is a schematic diagram of an efficiency curve between load current and power supply efficiency provided in an embodiment of the present application.

[0059] FIG9 is a schematic flowchart of another method for controlling power supply of an OLED screen provided in an embodiment of the present application.

[0060] FIG10 is a schematic diagram of an inductance control module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0061] The technical solution in this application will be described below with reference to the accompanying drawings.

[0062] In the description of the embodiments of the present application, prefixes such as "first" and "second" are used only to distinguish different description objects and have no limiting effect on the position, order, priority, quantity or content of the described objects. The use of prefixes such as ordinal numbers to distinguish description objects in the embodiments of the present application does not constitute a restriction on the described objects. For the statement of the described objects, please refer to the description in the context of the claims or embodiments, and the use of such prefixes should not constitute an unnecessary restriction. In addition, in the description of the present embodiment, unless otherwise specified, the meaning of "multiple" is two or more.

[0063] References to "in some embodiments" and the like in this specification mean that a particular feature, structure, or characteristic described in connection with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in some embodiments" and the like appearing in different places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0064] In the embodiments of the present application, the same reference numerals represent the same component or part. In the embodiments of the present application, for multiple identical parts, only one of the parts may be labeled with a reference numeral in the drawings as an example. The same reference numerals apply to other identical parts or components.

[0065] A power management integrated circuit (PMIC) is a power supply circuit in electronic devices that is responsible for converting, distributing, detecting, and other power management functions. A PMIC can be understood as a screen power supply unit, providing the screen's backlight and display-related power needs. For organic light-emitting diode (OLED) screens, the display voltage drain (ELVDD) and the display voltage common ground (ELVSS) provide power to the screen's display pixel circuits, while the analog voltage drain (AVDD) provides power to the screen's internal analog circuitry.

[0066] The internal modules of the PMIC include a boost circuit (also called a boost circuit) and a buck-boost inverter circuit (also called a buck-boost inverter circuit). Through the buck and boost circuits, a negative voltage of ELVSS is formed, and ELVDD and AVDD are higher than the system power supply voltage.

[0067] As shown in Figure 1, Figure 1 shows a schematic diagram of a scenario in which an OLED screen of an electronic device (e.g., a mobile phone) is powered. A power source 10 (i.e., Vin) can power an OLED screen 30 via a power supply system 20 (e.g., the PMIC described above). In other words, current flows between the power source 10 and the power supply system 20, and between the power supply system 20 and the OLED screen 30.

[0068] Furthermore, Figure 2 shows a topological architecture diagram of a circuit of an electronic device (e.g., a mobile phone). It should be understood that the solid arrows in Figure 2 indicate the flow of current and can be considered as power lines; the dashed arrows indicate the transmission of signals and can be considered as control lines.

[0069] The power supply system 20 (such as PMIC) includes a boost circuit and a buck-boost reverse circuit. The current transmitted by the power supply Vin can be transmitted to the boost circuit through devices such as an inductor. The boost circuit can boost the DC voltage output by the power supply Vin to form ELVDD and AVDD voltages higher than the system power supply, and transmit them to the OLED display (not shown in Figure 2); the current transmitted by the power supply Vin can also be directly transmitted to the buck-boost reverse circuit. The buck-boost reverse circuit can step down the DC voltage output by the power supply Vin to form an ELVSS negative voltage.

[0070] It's important to note that OLED screens require multiple power supplies, among which ELVDD, ELVSS, and AVDD are the most essential. ELVDD is the positive high-voltage power supply for the OLED, providing the OLED's operating voltage. Due to the operating principle of OLEDs, a high-voltage positive power supply is required to inject electrons into the OLED to ensure optimal brightness and clarity. The ELVDD voltage typically ranges from +5V to +20V, though the specific value varies depending on the OLED design and production process. ELVSS is the negative low-voltage power supply for the OLED, connected to the cathode terminal. It provides the OLED's zero potential and determines the brightness and clarity of the OLED's light. ELVSS is typically located at the lower left corner of the OLED and has no electrical connection to GND. The ELVSS voltage typically ranges from -2V to -5V, though the specific value varies depending on the OLED design and production process. AVDD is an analog power supply used to improve signal quality in OLED drivers. It is used to drive analog circuits in the OLED control circuitry, such as DACs and operational amplifiers. It should be understood that the ELVDD, ELVSS, and AVDD power supplies are typically provided by a DC / DC converter (buck / step-up control module).

[0071] In summary, ELVDD and ELVSS are the basic power supplies for OLED screen operation, representing the positive high voltage and negative low voltage power supplies, respectively, while AVDD is the analog power supply used for OLED screen control. Their specific voltage ranges and power supply methods depend on the design and production process of the OLED screen.

[0072] The display driver integrated circuit (DDIC) serves as a bridge between the upper-layer application processor (CPU) and the OLED screen. It can also be considered a bridge IC. The DDIC converts and amplifies the image signal from the mobile phone, processing it into a control waveform that the screen can receive. The PMIC generates AVDD, ELVDD, and ELVSS, but the specific voltage required is controlled by the DDIC, which can communicate with the PMIC via SWIRE or IIC protocols.

[0073] It's important to understand that the efficiency of a boost circuit is dependent on the inductor selection and the boost switching frequency. Achieving higher conversion efficiency for different load currents requires matching inductors with different inductance parameters. Currently, PMICs offer only one boost inductor value. For a fixed inductor value, the load current vs. efficiency curve remains constant.

[0074] As shown in FIG3 , FIG3 shows a schematic diagram of the efficiency curve between the load current and the power efficiency shown in FIG2 . Wherein, the power efficiency η is the output power P out With input power P in The ratio of η = P out / P in , where the output power P out is the output voltage V out With the output current I out The product of the input power P in is the input voltage V in With input current I in The product of η=(V out *I out ) / (V in *I in ).

[0075] Since the inductance of the path shown in Figure 2 is fixed and cannot be adjusted to match the load, and the buck-boost parameters are fixed, there is only one set of fixed buck-boost control parameters that cannot be controlled through external transmission, and it is impossible to switch different control parameters to meet the needs of switching different inductances. Therefore, there is only one set of efficiency curves corresponding to the load current of the path shown in Figure 2, only one high-efficiency load current point (i.e., X mA), and only one high-efficiency screen brightness operating point. When the user's usage scenario has multiple common current values, the existing technology cannot match multiple current value designs to switch different inductance value paths, and achieve multiple high-efficiency ranges corresponding to multiple common currents.

[0076] In other words, the existing technology has the following defects: the inductor parameters are fixed and cannot be dynamically switched and adjusted according to load demand; the PMIC control logic is simple, and the internal control parameters are fixed and cannot be dynamically adjusted; there is only one high-efficiency screen brightness operating point, and the high-efficiency screen brightness operating point cannot be adjusted according to user needs. As shown in Figure 3, when the device parameters of the buck-boost circuit are fixed, the operating efficiency will first increase and then decrease as the load current continues to increase. The load current value corresponding to the highest operating efficiency is the high-efficiency current operating point; the screen brightness value corresponding to the high-efficiency operating load current is the high-efficiency screen operating brightness point. When there are multiple high-efficiency operating points, the operating points at the left and right ends will form a current operating region. The operating efficiency in these two regions will be relatively high, and this width is the high-efficiency operating range.

[0077] In view of this, the embodiments of the present application provide a power supply device for an OLED screen, a control method thereof, and an electronic device. The optional inductance path can correspond to multiple common currents by reasonably switching the inductance value. When the screen load is a certain fixed current, it switches to the high-efficiency inductance path corresponding to the current, thereby achieving high-efficiency power supply and reducing system power consumption.

[0078] In other words, the present application can automatically switch inductors of different inductance values ​​according to the load of different screen brightness; synchronously match different control parameters according to the inductor switching of different inductance values; and the entire architecture has at least two efficient screen brightness operating points.

[0079] The system architecture provided in this application adds an inductor selection module, an inductor selection control and control parameter transmission module, and a voltage compensation stabilization module on the basis of the previous basic PMIC power supply circuit, so that it can automatically switch the appropriate inductor value path according to different screen brightness and adjust the path parameters to maintain system stability, which can improve power supply efficiency and reduce heat generation and power consumption of electronic equipment.

[0080] Figure 4 is a schematic diagram of the structure of an OLED screen power supply device provided in an embodiment of the present application. As shown in Figure 4, the OLED screen power supply device may include an inductor selection module 110, a buck-boost switch and control module 120 (or referred to as a buck-boost control module), an inductor selection control and control parameter transmission module 140 (or referred to as an inductor control module), and a voltage compensation stabilization module 130.

[0081] The inductor selection module 110 can use an external general-purpose input / output (GPIO) interface to control switching, selecting inductors of different values. In other words, the inductor selection module 110 is used to control the switching of the switch to select paths with different inductance values. The inductor selection module 110 includes two topology modes: parallel and series. These are described in detail below with reference to Figures 5 and 6.

[0082] The buck-boost switch and control module 120 (i.e., the step-up / down control module) is electrically connected to the inductor selection module 110 and is configured to output an output voltage to the OLED screen that is lower or higher than the input voltage. Exemplarily, the buck-boost switch and control module 120 includes two boost circuits and one buck-boost inverter circuit. The two boost circuits can respectively output the ELVDD and AVDD power supplies required by the OLED display, while the one buck-boost inverter circuit can output the ELVSS power supply required by the OLED display.

[0083] The inductor selection control and control parameter transmission module 140 (i.e., the inductor control module) is the logic control center of the entire topology architecture. It is used to control the inductor selection module 110 through GPIO to switch the switch to select a specific inductor when the parameters should be switched. It also transmits power supply loop parameters to the buck-boost switch and control module 120 to maintain output voltage stability and normal inductor operation. The transmitted power supply loop parameters may include switching rate, switching frequency, and current parameters of the driving switch tube.

[0084] Specifically, the inductor selection control and control parameter transmission module 140 (i.e., the inductor control module) is communicatively connected to the inductor selection module 110 to control the inductor selection module 110 to select the path corresponding to the target inductance value. The inductor selection control and control parameter transmission module 140 (i.e., the inductor control module) is also communicatively connected to the buck-boost switch and control module 120 (i.e., the buck-boost control module) to transmit power supply loop parameters to the buck-boost switch and control module 120 (i.e., the buck-boost control module) to maintain output voltage stability.

[0085] The voltage compensation and stabilization module 130 is electrically connected to the buck-boost switch and control module 120 (i.e., the buck-boost control module) and is located at the output of the buck-boost switch and control module 120 (i.e., the buck-boost control module). It is used to maintain the stability of the transient output voltage of the inductor selection module 110 when switching the switch tube.

[0086] It should be understood that the voltage compensation stabilization module 130 is an inductor switching voltage compensation stabilization module. When the inductance of the path switches, there will be a transient buck-boost circuit without output. At this time, the voltage compensation stabilization module 130 is required to maintain the transient output voltage stability and compensate for the transient output current. Exemplarily, the voltage compensation stabilization module 130 can be a large capacitor, the capacitance of which is determined by the switching speed and / or switching duration of the switch tube of the inductor selection module 110. For example, for a nanosecond-level MOS switch, a large capacitor of 22μF or more can be selected for compensation.

[0087] It should be understood that the solid arrows in Figure 4 indicate the flow of current and can be considered the power circuit; the dashed arrows indicate the transmission of signals (transmitting control signals) and can be considered the control circuit. Current can flow from the power supply through the inductor selection module 110, the buck-boost switch and control module 120, and the voltage compensation and stabilization module 130, and ultimately to the OLED display. The inductor selection control and control parameter transmission module 140 can transmit control signals to the buck-boost switch and control module 120 to indicate specific transmission parameters; it can also transmit control signals to the inductor selection module 110 to indicate the selected inductor value.

[0088] Figures 5 and 6 are circuit topology diagrams of two OLED screen power supply devices provided in embodiments of the present application. Figure 5 shows the circuit topology diagram in parallel mode, and Figure 6 shows the circuit topology diagram in series mode.

[0089] As shown in FIG5 , in the topological architecture of the circuit in parallel mode, the inductor selection module 110 includes multiple parallel paths, each of which may include at least two inductors and at least two switches. For example, two inductors may be connected in parallel on a given path. Since the two inductors are connected in parallel, they can be switched between and cannot be selected simultaneously. Although the configurable inductance values ​​in parallel mode are limited, the equivalent impedance of the inductor of the entire path is easily controllable, and different switches can be switched to achieve different inductance selections.

[0090] Exemplarily, the inductor selection module 110 may include four parallel paths, each of which may include two inductors and two switches. For example, the first path includes switch S1, switch S1', inductor L1', and inductor L1", where inductor L1' and inductor L1" are arranged in parallel, with switch S1 and switch S1' located at both ends of inductor L1' and inductor L1", respectively, to control the inductor selection of the first path. When switch S1 and switch S1' are connected to both ends of inductor L1', the inductance of the first path is L1'; when switch S1 and switch S1' are connected to both ends of inductor L1", the inductance of the first path is L1", where L1' and L1" have different inductances.

[0091] The second path includes switch S2, switch S2', inductor L2', and inductor L2", which are arranged in parallel. Switch S2 and switch S2' are located at the ends of inductor L2' and inductor L2", respectively, to control the inductance selection of the second path. When switch S2 and switch S2' are connected to the ends of inductor L2', the inductance of the second path is L2'; when switch S2 and switch S2' are connected to the ends of inductor L2", the inductance of the second path is L2", where L2' and L2" have different inductances.

[0092] The third path includes switch S3, switch S3', inductor L3', and inductor L3". Inductor L3' and inductor L3" are arranged in parallel. Switch S3 and switch S3' are located at both ends of inductor L3' and inductor L3", respectively, to control the inductance selection of the third path. When switch S3 and switch S3' are connected to both ends of inductor L3', the inductance of the third path is L3'. When switch S3 and switch S3' are connected to both ends of inductor L3", the inductance of the third path is L3", where L3' and L3" have different inductances.

[0093] The fourth path includes a switch S4, a switch S4', an inductor L4', and an inductor L4", which are arranged in parallel. Switch S4 and switch S4' are located at the ends of inductor L4' and inductor L4", respectively, to control the inductance selection of the fourth path. When switch S4 and switch S4' are connected to the ends of inductor L4', the inductance of the fourth path is L4'; when switch S4 and switch S4' are connected to the ends of inductor L4", the inductance of the fourth path is L4", where L4' and L4" have different inductances.

[0094] That is to say, in the embodiment of the present application, the inductance selection module 110 can be used to switch the inductance on each path, select inductors with different inductance values, and implement switching of inductance values ​​corresponding to different screen brightnesses.

[0095] The buck-boost switch and control module 120 includes a boost circuit and a buck-boost reverse voltage circuit, and can output the ELVDD, ELVSS and AVDD power supplies required by the OLED display.

[0096] It should be understood that the first and fourth paths can connect to the buck-boost switch and the boost circuit in the control module 120. The first path outputs ELVDD through the boost circuit, and the fourth path outputs AVDD through the boost circuit. The second and third paths can connect to the buck-boost switch and the buck-boost inverter circuit in the control module 120, and the buck-boost inverter circuit can output ELVSS.

[0097] The voltage compensation stabilization module 130 may include capacitors C1, C2, and C3, wherein capacitor C1 is provided at the output end of the boost circuit outputting ELVDD, capacitor C2 is provided at the output end of the buck-boost circuit outputting ELVSS, and capacitor C3 is provided at the output end of the boost circuit outputting AVDD.

[0098] It should be understood that the capacitance values ​​of capacitors C1, C2, and C3 can be determined based on the switching speed (or switching time length). For example, for a nanosecond-level MOS switch, the capacitance values ​​of capacitors C1, C2, and C3 can be greater than 22 μF, thereby maintaining transient output voltage stability and compensating for transient output current.

[0099] The inductor selection control and control parameter transmission module 140 is used to control the inductor selection module 110 to select a specific inductor and transmit power supply loop parameters to the buck-boost switch and control module 120 to maintain output voltage stability and proper inductor operation. These power supply loop parameters may include the switching rate, switching frequency, and switch drive current within the buck-boost control module, as well as loop monitoring threshold parameters. These parameters are internal to the buck-boost control module and are not external to the device. They are unrelated to the switches in the inductor selection module.

[0100] Exemplarily, the inductor selection control and control parameter transmission module 140 may include a system on chip (SOC) or a microcontroller unit (MCU).

[0101] For example, the inductor selection control and control parameter transmission module 140 can transmit a control signal to the buck-boost switch and control module 120 via a bidirectional serial data line (SDA) and / or a serial clock line (SCL), where the control signal is used to indicate the adjusted power supply loop parameters.

[0102] In the circuit architecture for parallel inductor selection, combined with the inductor selection module 110, the buck-boost switch and control module 120, the inductor selection control and control parameter transmission module 140, and the voltage compensation stabilization module 130, different inductor paths can be selected for different OLED screen brightness values ​​(or load current values), thereby allowing the OLED screen to operate within an efficient operating range.

[0103] In some embodiments, the inductor selection module 110 includes multiple parallel paths, and each parallel path includes multiple inductors and multiple switching tubes, wherein the multiple inductors include a first inductor and a second inductor, and the multiple switching tubes include a first switching tube and a second switching tube. The first inductor and the second inductor are arranged in parallel, the inductance value of the first inductor is different from the inductance value of the second inductor, and the first switching tube and the second switching tube are respectively located at the two ends of the first inductor and the second inductor.

[0104] In response to the brightness (or load current) of the OLED screen being less than or equal to a first threshold (i.e., the OLED screen operates in the high-efficiency working range corresponding to the first inductor), the inductor control module is used to control the inductor selection module to switch to the first path corresponding to the first inductor, and transmit the power supply loop parameters corresponding to the first path to the buck-boost control module. The inductor selection module is used to connect the first switching tube and the second switching tube to the two ends of the first inductor, and the buck-boost control module is used to adjust the power supply loop parameters to the power supply loop parameters corresponding to the first path.

[0105] In response to the brightness (or load current) of the OLED screen being greater than a first threshold (i.e., the OLED screen operates in the high-efficiency working range corresponding to the second inductor), the inductor control module is used to control the inductor selection module to switch to the second path corresponding to the second inductor, and transmit the power supply loop parameters corresponding to the second path to the buck-boost control module. The inductor selection module is used to connect the first switching tube and the second switching tube to the two ends of the second inductor, and the buck-boost control module is used to adjust the power supply loop parameters to the power supply loop parameters corresponding to the second path.

[0106] Alternatively, in response to the brightness (or load current) of the OLED screen being less than a first threshold value (i.e., the OLED screen operates in a high-efficiency working range corresponding to the first inductor), the inductor control module is used to control the inductor selection module to switch to the first path corresponding to the first inductor, and transmit the power supply loop parameters corresponding to the first path to the buck-boost control module. The inductor selection module is used to connect the first switching tube and the second switching tube to the two ends of the first inductor, and the buck-boost control module is used to adjust the power supply loop parameters to the power supply loop parameters corresponding to the first path.

[0107] In response to the brightness (or load current) of the OLED screen being greater than or equal to a first threshold (i.e., the OLED screen operates in the high-efficiency working range corresponding to the second inductor), the inductor control module is used to control the inductor selection module to switch to the second path corresponding to the second inductor, and transmit the power supply loop parameters corresponding to the second path to the buck-boost control module. The inductor selection module is used to connect the first switching tube and the second switching tube to the two ends of the second inductor, and the buck-boost control module is used to adjust the power supply loop parameters to the power supply loop parameters corresponding to the second path.

[0108] In this embodiment, the inductance selection module sets a first inductor and a second inductor in parallel, and the inductance values ​​of the first inductor and the second inductor are different. The inductance control module can select different inductance paths according to the brightness of the OLED screen, so that different inductance paths can be switched under different screen brightness to improve the working efficiency of the circuit. At the same time, different power supply loop parameters can be switched according to the inductance of different paths, so as to improve the stability of the loop, and finally the screen can operate within the high-efficiency working range, thereby reducing the power consumption of the screen and the heating of the electronic equipment, and achieving high-efficiency power supply.

[0109] In some embodiments, in response to the brightness (or load current) of the OLED screen being less than or equal to a first threshold (i.e., the OLED screen operates in a high-efficiency working range corresponding to the first inductor), the inductor control module is used to: send a first signal to the inductor selection module and send a second signal to the buck-boost control module, the first signal being used to instruct the inductor selection module to switch to the first path corresponding to the first inductor, and the second signal being used to instruct the buck-boost control module on the power supply loop parameters corresponding to the first path; the inductor selection module being used to receive the first signal and connect the first switching tube and the second switching tube to both ends of the first inductor according to the first signal; the buck-boost control module being used to receive the second signal and adjust the power supply loop parameters to the power supply loop parameters corresponding to the first path.

[0110] In response to the brightness (or load current) of the OLED screen being greater than a first threshold (i.e., the OLED screen operates in the high-efficiency working range corresponding to the second inductor), the inductor control module is used to: send a third signal to the inductor selection module and send a fourth signal to the buck-boost switch control module, where the third signal is used to instruct the inductor selection module to switch to the second path corresponding to the second inductor, and the fourth signal is used to instruct the buck-boost control module on the power supply loop parameters corresponding to the second path; the inductor selection module is used to receive the third signal and connect the first switch tube and the second switch tube to the two ends of the second inductor according to the third signal; the buck-boost control module is used to receive the fourth signal and adjust the power supply loop parameters to the power supply loop parameters corresponding to the second path.

[0111] Alternatively, in response to the brightness (or load current) of the OLED screen being less than a first threshold value (i.e., the OLED screen operates in the high-efficiency working range corresponding to the first inductor), the inductor control module is used to: send a first signal to the inductor selection module and send a second signal to the buck-boost control module, the first signal being used to instruct the inductor selection module to switch to the first path corresponding to the first inductor, and the second signal being used to instruct the buck-boost control module on the power supply loop parameters corresponding to the first path; the inductor selection module being used to receive the first signal and connect the first switching tube and the second switching tube to the two ends of the first inductor according to the first signal; the buck-boost control module being used to receive the second signal and adjust the power supply loop parameters to the power supply loop parameters corresponding to the first path.

[0112] In response to the brightness (or load current) of the OLED screen being greater than or equal to a first threshold (i.e., the OLED screen operates in the high-efficiency working range corresponding to the second inductor), the inductor control module is used to: send a third signal to the inductor selection module and send a fourth signal to the buck-boost switch control module, where the third signal is used to instruct the inductor selection module to switch to the second path corresponding to the second inductor, and the fourth signal is used to instruct the buck-boost control module on the power supply loop parameters corresponding to the second path; the inductor selection module is used to receive the third signal and connect the first switch tube and the second switch tube to the two ends of the second inductor according to the third signal; the buck-boost control module is used to receive the fourth signal and adjust the power supply loop parameters to the power supply loop parameters corresponding to the second path.

[0113] In this embodiment, the inductance control module can send corresponding signals to the buck-boost switch control module and the inductance selection module respectively according to the screen brightness value, so that different inductance paths can be switched under different screen brightnesses, thereby improving the working efficiency of the circuit and improving the stability of the loop. Ultimately, the screen can operate within an efficient working range, thereby reducing the power consumption of the screen and the heat generation of the electronic equipment, and achieving high-efficiency power supply.

[0114] In one example, in response to the brightness (or load current) of the OLED screen being less than or equal to a first threshold, for example, the inductor selection control and control parameter transmission module 140 detects that the brightness (or load current) of the OLED screen is less than or equal to the first threshold, as shown in FIG5 , the inductor selection control and control parameter transmission module 140 can control the inductor selection module 110 to connect the switch tube S1 and the switch tube S1′ to the two ends of L1′ to form a path 1, and at the same time send the power supply loop parameters corresponding to the path 1 to the buck-boost switch and control module 120; the inductor selection module 110 can be controlled to connect the switch tube S2 and the switch tube S2′ to the two ends of L1′ to form a path 1. ' is connected to both ends of L2' to form path 2, and the power supply loop parameters corresponding to path 2 are sent to the buck-boost switch and control module 120; the inductor selection module 110 can be controlled to connect the switch tube S3 and the switch tube S3' to both ends of L3' to form path 3, and the power supply loop parameters corresponding to path 3 are sent to the buck-boost switch and control module 120; the inductor selection module 110 can be controlled to connect the switch tube S4 and the switch tube S4' to both ends of L4' to form path 4, and the power supply loop parameters corresponding to path 4 are sent to the buck-boost switch and control module 120.

[0115] In another example, in response to the brightness (or load current) of the OLED screen being greater than a first threshold, for example, the inductor selection control and control parameter transmission module 140 detects that the brightness (or load current) of the OLED screen is greater than the first threshold, as shown in FIG5 , the inductor selection control and control parameter transmission module 140 can control the inductor selection module 110 to connect the switch tube S1 and the switch tube S1′ to both ends of L1″ to form a path 1′, and at the same time send the power supply loop parameters corresponding to the path 1′ to the buck-boost switch and control module 120; the inductor selection module 110 can be controlled to connect the switch tube S2 and the switch tube S2′ to the ends of L1″ to form a path 1′. The two ends of L2" form path 2', and the power supply loop parameters corresponding to path 2' are sent to the buck-boost switch and control module 120; the inductor selection module 110 can be controlled to connect the switch tube S3 and the switch tube S3' to the two ends of L3", forming path 3', and the power supply loop parameters corresponding to path 3' are sent to the buck-boost switch and control module 120; the inductor selection module 110 can be controlled to connect the switch tube S4 and the switch tube S4' to the two ends of L4", forming path 4', and the power supply loop parameters corresponding to path 4' are sent to the buck-boost switch and control module 120.

[0116] For example, the inductor selection control and control parameter transmission module 140 sends a digital signal (such as 0 or 1) to the inductor selection module 110, where 0 indicates that the switch is turned up, such as switch S1 and switch S1' are connected across L1', switch S2 and switch S2' are connected across L2', switch S3 and switch S3' are connected across L3', and switch S4 and switch S4' are connected across L4'; 1 indicates that the switch is turned down, such as switch S1 and switch S1' are connected across L1", switch S2 and switch S2' are connected across L2", switch S3 and switch S3' are connected across L3", and switch S4 and switch S4' are connected across L4".

[0117] In some embodiments, considering the scarcity of GPIO resources, the topology architecture processing in parallel mode includes the modules mentioned above, and a decoder 210 (such as a typical 38 decoder) can also be provided. The decoder 210 can be connected to the inductor selection control and control parameter transmission module 140 to control the connectivity of the inductor path. The addition of the decoder 210 can reduce the use of GPIO. That is, the decoder 210 is located between the inductor selection module 110 and the inductor selection control and control parameter transmission module 140 (i.e., the inductor control module). The inductor selection control and control parameter transmission module 140 (i.e., the inductor control module) sends a control signal to the inductor selection module 110 through the decoder 210. The decoder 210 is used to reduce the use of the general input and output interface GPIO of the inductor selection control and control parameter transmission module 140 (i.e., the inductor control module).

[0118] Therefore, the circuit topology architecture of the parallel mode provided in the embodiment of the present application, first, can control the inductor switching and control the power supply loop parameters through an external SOC or MCU to ensure the stability of the loop; second, by setting a large capacitor for compensation, the voltage drop during the switch switching can meet the power supply of the OLED screen (or DDIC); third, through the dynamic switching of the inductor, multiple load current operating points corresponding to high output efficiency can be achieved, and the drop can meet the power supply of the OLED screen (or DDIC).

[0119] As shown in FIG6 , in the topology diagram of the circuit in series mode, the inductor selection module 110 uses a mode of two inductors in series. In the large inductance state, two inductors are connected in series to the circuit, and in the small inductance state, a single inductor is connected to the circuit. The configurable inductance value can be very large and only requires one switch to control it.

[0120] Exemplarily, the inductor selection module 110 may include four parallel paths, each of which may include two inductors and a switch. For example, the first path includes a switch S1'', an inductor L1, and an inductor L1''. The inductor L1 and the inductor L1'' may be connected in series, and the switch S'' is used to control the connection of the inductor L1''. When the switch S''' is connected to the inductor L1'', the inductor selection module 110 is in a high inductance state, and the inductance of the first path is the sum of L1 and L1''; when the switch S''' is not connected to the inductor L1'', the inductor selection module 110 is in a low inductance state, and the inductance of the first path is L1.

[0121] The second path includes a switch S2'", an inductor L2, and an inductor L2'". The inductor L2 and the inductor L2'' can be connected in series. The switch S'' is used to control the connection of the inductor L2''. When the switch S''' is connected to the inductor L2'', the inductor selection module 220 is in a high inductance state, and the inductance of the second path is the sum of L2 and L2''. When the switch S''' is not connected to the inductor L2'', the inductor selection module 220 is in a low inductance state, and the inductance of the second path is L2.

[0122] The third path includes a switch S3'", an inductor L3, and an inductor L3'". The inductor L3 and the inductor L3' can be connected in series. The switch S'' is used to control the connection of the inductor L3''. When the switch S''' is connected to the inductor L3'', the inductor selection module 110 is in a high inductance state, and the inductance of the third path is the sum of L3 and L3''. When the switch S''' is not connected to the inductor L3'', the inductor selection module 110 is in a low inductance state, and the inductance of the third path is L3.

[0123] The fourth path includes a switch S4'", an inductor L4, and an inductor L4'". Inductor L4 and inductor L4'' can be connected in series. Switch S'' is used to control the connection of inductor L4''. When switch S''' is connected to inductor L4'', the inductor selection module 440 is in a high inductance state, and the inductance of the fourth path is the sum of L4 and L4''. When switch S''' is not connected to inductor L4'', the inductor selection module 440 is in a low inductance state, and the inductance of the fourth path is L4.

[0124] That is to say, in the embodiment of the present application, the inductance selection module 110 can be used to switch the inductance on each path, select inductors with different inductance values, and implement switching of inductance values ​​corresponding to different screen brightnesses.

[0125] The buck-boost switch and control module 120 includes a boost circuit and a buck-boost reverse voltage circuit, and can output the ELVDD, ELVSS and AVDD power supplies required by the OLED display.

[0126] It should be understood that the first and fourth paths can connect to the buck-boost switch and the boost circuit in the control module 120. The first path outputs ELVDD through the boost circuit, and the fourth path outputs AVDD through the boost circuit. The second and third paths can connect to the buck-boost switch and the buck-boost inverter circuit in the control module 120, and the buck-boost inverter circuit can output ELVSS.

[0127] The voltage compensation stabilization module 130 may include capacitors C1, C2, and C3, wherein capacitor C1 is provided at the output end of the boost circuit outputting ELVDD, capacitor C2 is provided at the output end of the buck-boost circuit outputting ELVSS, and capacitor C3 is provided at the output end of the boost circuit outputting AVDD.

[0128] It should be understood that the capacitance values ​​of capacitors C1, C2, and C3 can be determined based on the switching speed (or switching time length). For example, for a nanosecond-level MOS switch, the capacitance values ​​of capacitors C1, C2, and C3 can be greater than 22 μF, thereby maintaining transient output voltage stability and compensating for transient output current.

[0129] The inductor selection control and control parameter transmission module 140 is used to control the inductor selection module 110 to select a specific inductor and transmit power supply loop parameters to the buck-boost switch and control module 120 to maintain output voltage stability and proper inductor operation. These power supply loop parameters may include the switching rate, switching frequency, and switch drive current within the buck-boost control module, as well as loop monitoring threshold parameters. These parameters are internal to the buck-boost control module and are not external to the device. They are unrelated to the switches in the inductor selection module.

[0130] Exemplarily, the inductor selection control and control parameter transmission module 140 may include an SOC or an MCU.

[0131] For example, the inductor selection control and control parameter transmission module 140 may transmit a control signal to the buck-boost switch and control module 120 via SDA and / or SCL, where the control signal is used to indicate the adjusted power supply loop parameters.

[0132] In the circuit architecture for series inductor selection, combined with the inductor selection module 110, the buck-boost switch and control module 120, the inductor selection control and control parameter transmission module 140, and the voltage compensation stabilization module 130, different inductor paths can be selected for different OLED screen brightness values ​​(or load current values), thereby allowing the OLED screen to operate within an efficient operating range.

[0133] In some embodiments, the inductor selection module 110 includes multiple parallel paths, and each parallel path includes multiple inductors and a third switching tube, wherein the multiple inductors include a third inductor and a fourth inductor, the third inductor and the fourth inductor are arranged in series, and the third switching tube is located between the third inductor and the fourth inductor.

[0134] In response to the brightness (or load current) of the OLED screen being less than or equal to a second threshold (i.e., the OLED screen operating within a high-efficiency operating range corresponding to the third inductor), the inductor control module is configured to control the inductor selection module to switch to a third path corresponding to the third inductor, and transmit power supply loop parameters corresponding to the third path to the buck-boost control module. The inductor selection module is configured to connect the first switch tube to the third path having the third inductor, and the buck-boost switch control module is configured to adjust the power supply loop parameters to those corresponding to the third path.

[0135] In response to the brightness (or load current) of the OLED screen being greater than a second threshold value (i.e., when the OLED screen operates in the high-efficiency working range corresponding to the fifth inductor, the fifth inductor is the sum of the third inductor and the fourth inductor), the inductor control module is used to control the inductor selection module to switch to the fourth path, and transmit the power supply loop parameters corresponding to the fourth path to the buck-boost control module. The fourth path has a third inductor and a fourth inductor. The inductor selection module is used to connect the third switch tube to the fourth path, and the buck-boost control module is used to adjust the power supply loop parameters to the power supply loop parameters corresponding to the fourth path.

[0136] Alternatively, in response to the brightness (or load current) of the OLED screen being less than a second threshold (i.e., the OLED screen operating within a high-efficiency operating range corresponding to the third inductor), the inductor control module is configured to control the inductor selection module to switch to a third path corresponding to the third inductor, and transmit power supply loop parameters corresponding to the third path to the buck-boost control module. The inductor selection module is configured to connect the first switch tube to the third path having the third inductor, and the buck-boost switch control module is configured to adjust the power supply loop parameters to those corresponding to the third path.

[0137] In response to the brightness (or load current) of the OLED screen being greater than or equal to a second threshold value (i.e., when the OLED screen operates in the high-efficiency working range corresponding to the fifth inductor, the fifth inductor is the sum of the third inductor and the fourth inductor), the inductor control module is used to control the inductor selection module to switch to the fourth path, and transmit the power supply loop parameters corresponding to the fourth path to the buck-boost control module. The fourth path has the third inductor and the fourth inductor. The inductor selection module is used to connect the third switch tube to the fourth path, and the buck-boost control module is used to adjust the power supply loop parameters to the power supply loop parameters corresponding to the fourth path.

[0138] In this embodiment, the inductance selection module 110 can set the inductance in series and select different paths by switching the switch tube. The inductance values ​​on different paths are different. The inductance control module can select different inductance paths according to the brightness of the OLED screen, so that different inductance paths can be switched at different screen brightnesses to improve the working efficiency of the circuit. At the same time, different power supply loop parameters can be switched according to the inductance of different paths, so as to improve the stability of the loop, and finally the screen can operate within the high-efficiency working range, thereby reducing the power consumption of the screen and the heat generation of the electronic equipment, and achieving high-efficiency power supply.

[0139] In one example, in response to the brightness (or load current) of the OLED screen being less than or equal to the second threshold, for example, the inductor selection control and control parameter transmission module 140 detects that the brightness (or load current) of the OLED screen is less than or equal to the second threshold, as shown in FIG6 , the inductor selection control and control parameter transmission module 140 can control the inductor selection module 110 to connect the switch tube S1″ to the path 1″ having L1, and at the same time send the power supply loop parameters corresponding to the path 1″ to the buck-boost switch and control module 120; the inductor selection module 110 can be controlled to connect the switch tube S1″ to the path 1″ having L1. 2"' is connected to path 2" with L2, and the power supply loop parameters corresponding to path 2" are sent to the buck-boost switch and control module 120; the inductor selection module 110 can be controlled to connect switch tube S3"' to path 3" with L3, and the power supply loop parameters corresponding to path 3" are sent to the buck-boost switch and control module 120; the inductor selection module 110 can be controlled to connect switch tube S4"' to path 4" with L4, and the power supply loop parameters corresponding to path 4" are sent to the buck-boost switch and control module 120.

[0140] In another example, in response to the brightness (or load current) of the OLED screen being greater than the second threshold, for example, the inductor selection control and control parameter transmission module 140 detects that the brightness (or load current) of the OLED screen is greater than the second threshold, as shown in FIG6 , the inductor selection control and control parameter transmission module 140 can control the inductor selection module 110 to connect the switch tube S1″′ to the path 1″′ having L1 and L1″′, and at the same time send the power supply loop parameters corresponding to the path 1″′ to the buck-boost switch and control module 120; the inductor selection module 110 can be controlled to connect the switch tube S2″′ to the path 1″ having L2 and L2″′ to path 2″′, and simultaneously send the power supply loop parameters corresponding to path 2″′ to the buck-boost switch and control module 120; the inductor selection module 110 can be controlled to connect the switch tube S3″′ to path 3″′ having L3 and L3″′, and simultaneously send the power supply loop parameters corresponding to path 3″′ to the buck-boost switch and control module 120; the inductor selection module 110 can be controlled to connect the switch tube S4″′ to path 4″′ having L4 and L4″′, and simultaneously send the power supply loop parameters corresponding to path 4″′ to the buck-boost switch and control module 120.

[0141] For example, the inductor selection control and control parameter transmission module 140 sends a digital signal (such as 0 or 1) to the inductor selection module 110, where 0 indicates that the switch is turned upward, such as switch S1'' connecting L1 and L1'', switch S2'' connecting L2 and L2'', switch S3'' connecting L3 and L3'', and switch S4'' connecting L4 and L4''; 1 indicates that the switch is turned downward, such as switch S1'' only connecting L1, switch S2'' only connecting L2, switch S3'' only connecting L3, and switch S4'' only connecting L4.

[0142] Therefore, the series mode circuit topology provided in the embodiments of the present application can, first, control inductor switching and PMIC control parameters through an external SOC or MCU to ensure loop stability; second, by providing a large capacitor for compensation, the voltage drop during switching can meet the power supply requirements of the OLED screen (or DDIC); and third, through dynamic inductor switching, multiple load current operating points corresponding to high output efficiency can be achieved, and the drop can meet the power supply requirements of the OLED screen (or DDIC). In addition, in the series mode architecture, GPIO requirements are relatively low, and the inductor selection control and control parameter transmission module 140 (such as an SOC or MCU) can directly control the selection of the inductor path. However, in the series mode, the equivalent impedance in the circuit is relatively large, making inductor selection more difficult.

[0143] In summary, this application addresses the issue of inductor values ​​not being able to dynamically change. By designing two switching methods, a series inductor solution and a parallel inductor solution, we achieve dynamic inductor switching solutions with different advantages to adapt to different selection scenarios. Different selection requirements are matched with different dynamic inductor switching solutions, which not only improves circuit efficiency but also enhances solution compatibility.

[0144] This application addresses the issue of control parameter instability by designing an inductor selection control and control parameter transmission module 140. This synchronizes parameter switching with inductor switching, and uses digital circuit communication to synchronize circuit control parameter switching with inductor switching, thereby improving loop stability and operating efficiency. Different inductor paths correspond to different control parameters, which can improve loop stability and maximize the operating efficiency of different inductors in corresponding scenarios.

[0145] This application addresses the issue of voltage drops caused by switching without a circuit to suppress them. We have designed an inductive switching voltage compensation and stabilization module 130. By adding a voltage-stabilizing capacitor to the voltage output, the capacitor compensates for voltage drops during the switching process, ensuring voltage output stability during switching. This voltage drop compensation during switching maintains transient voltage stability.

[0146] This application addresses the problem of only one efficient operating point corresponding to the circuit's load current draw. By integrating the inductor selection module 110, the inductor compensation and stabilization module 130, and the inductor selection control and control parameter transmission module 140, different inductor paths are switched at different screen brightness levels, increasing the number of efficient operating points. This reduces overall power consumption in bright-screen scenarios, reduces heat generation in electronic devices, and improves operating efficiency.

[0147] FIG7 is a schematic flowchart of a method for controlling power supply of an OLED screen provided in an embodiment of the present application.

[0148] It should be noted that the execution body of the control method 100 may be the inductor selection control and control parameter transmission module 140 (ie, the inductor control module), for example, an SOC or an MCU, which is not limited in this application.

[0149] S110 , detecting that the brightness of the screen changes from a first brightness to a second brightness, wherein the first brightness is within a brightness range corresponding to a high-efficiency working interval under a first path, and the first path has a first inductance.

[0150] It should be understood that when an electronic device (such as an SOC or MCU) detects that the brightness of the OLED screen has changed, for example, it detects that the brightness of the screen has changed from a first brightness to a second brightness, the first brightness is within the brightness range corresponding to the efficient working interval under the first path, and the second brightness is within the brightness range corresponding to the efficient working interval under the second path. The first path has a first inductance, the second path has a second inductance, and the first inductance and the second inductance are different in size.

[0151] For example, when the input and output voltages are the same, the load current efficiency curve corresponding to inductor A (i.e., the first inductor) and the load current efficiency curve corresponding to inductor B (i.e., the second inductor) can refer to Figure 8, where A and B are different in size, and A can be smaller than B. For OLED screens, the load current and screen brightness have a one-to-one correspondence. The intersection of the two efficiency curves is the trigger point for inductor switching. The corresponding load current at this point can be C mA, and the corresponding screen brightness is D nit (i.e., the target brightness). Therefore, the efficient operating ranges corresponding to the two inductors are obtained, namely the efficient operating range of inductor A (i.e., the efficient region of inductor A) and the efficient operating range of inductor B (i.e., the efficient region of inductor B).

[0152] When the screen brightness is lower than the target brightness (e.g., D nit ), that is, the load current is lower than C mA, inductor A achieves higher efficiency. This range is the high-efficiency operating range of inductor A. When the screen brightness is higher than the target brightness (e.g., D nit ), that is, the load current is higher than C mA, inductor B achieves higher efficiency. This range is the high-efficiency operating range of inductor B. Based on this, the use of switching inductors can be controlled by monitoring the screen brightness, thereby improving power supply efficiency.

[0153] For example, when it is detected that the brightness of the OLED screen changes from a first brightness to a second brightness, the first brightness is less than or equal to the target brightness Dnit, and the second brightness is greater than the target brightness Dnit, it is necessary to switch the inductance in the path so that the OLED screen can operate in the high-efficiency working range corresponding to the second brightness value, that is, the path inductance can be switched from the first inductance (inductance A) to the second inductance (inductance B).

[0154] S120 , determining that the second brightness is greater than the target brightness, sending a first control signal to the inductor selection module, and sending a second control signal to the buck-boost control module.

[0155] The target brightness is greater than the first brightness and is the brightness corresponding to the intersection of the efficiency curve of the first path and the efficiency curve of the second path. The first control signal is used to instruct the inductor selection module to switch the first path to the second path, where the second path has a second inductor having a different inductance than the first inductor. The second control signal is used to indicate the power supply loop parameters corresponding to the second path.

[0156] For example, if the inductance control module determines that the changed brightness (i.e., the second brightness) is greater than the target brightness, it sends a first control signal to the inductance selection module and a second control signal to the buck-boost control module. If the inductance control module determines that the changed brightness (i.e., the second brightness) is less than or equal to the target brightness, it continues to operate within the high-efficiency operating range corresponding to the first path, that is, the inductance of the working path remains unchanged.

[0157] Exemplarily, the first control signal may be a digital signal (such as 0 or 1).

[0158] In an example, as shown in FIG5 , digital signal 0 is used to instruct the switches in the inductor selection module to be switched upward, such as switch S1 and switch S1′ are connected across L1′, switch S2 and switch S2′ are connected across L2′, switch S3 and switch S3′ are connected across L3′, and switch S4 and switch S4′ are connected across L4′; digital signal 1 is used to instruct the switches in the inductor selection module to be switched downward, such as switch S1 and switch S1′ are connected across L1″, switch S2 and switch S2′ are connected across L2″, switch S3 and switch S3′ are connected across L3″, and switch S4 and switch S4′ are connected across L4″.

[0159] In another example, as shown in FIG6 , digital signal 0 is used to instruct the switches in the inductor selection module to be switched upward, such as switch S1″′ connecting L1 and L1″′, switch S2″′ connecting L2 and L2″′, switch S3″′ connecting L3 and L3″′, and switch S4″′ connecting L4 and L4″′; digital signal 1 is used to instruct the switches in the inductor selection module to be switched downward, such as switch S1″′ connecting only L1, switch S2″′ connecting only L2, switch S3″′ connecting only L3, and switch S4″′ connecting only L4.

[0160] In an embodiment of the present application, the inductance control module (such as SOC or MCU) can choose to operate in an appropriate path according to the brightness changes of the OLED screen, so that the OLED screen can operate within the high-efficiency working range at different screen brightnesses, thereby reducing the screen power consumption and the heat generation of the electronic device and achieving high-efficiency power supply.

[0161] FIG9 is a schematic flowchart of another method for controlling power supply of an OLED screen provided in an embodiment of the present application.

[0162] The main idea of ​​the control method 200 for powering the OLED screen is as follows: when the brightness of the screen used by the user is about to change to the high-efficiency working brightness range corresponding to another inductor path, the inductor selection control and control parameter transmission module 140 (i.e., the inductor control module) sends a signal to control the inductor selection module 110 to switch channels, and at the same time transmits the circuit control parameters required for the corresponding channel to the buck-boost switch and control module 120 (i.e., the buck-boost control module) to complete the switching of different paths.

[0163] It should be noted that the execution body of the control method 200 may be the inductor selection control and control parameter transmission module 140 , for example, it may be an SOC or an MCU, and this application does not limit this.

[0164] S210: It is detected that the screen is initially lit up, and it is assumed that the screen is in the high-efficiency working range corresponding to the first path.

[0165] In this step, when it is detected that the screen is initially lit, it can be assumed that the screen is in the efficient working range corresponding to the first channel. Subsequently, it is necessary to determine whether it is working in the efficient working range corresponding to the first channel at the initial screen brightness.

[0166] The first path has a first inductance, that is, the first path may be a path corresponding to the first inductance. For example, as shown in FIG. 5 or FIG. 6 , in the initial default state, the first path may be a path formed by uniformly switching the switch downward or connecting the inductors below each path, and the inductance corresponding to the first path is the first inductance.

[0167] For example, as shown in FIG8 , when the screen is detected to be initially lit, the power supply device can be set by default to the path corresponding to inductor A, that is, the switch is switched to the path corresponding to inductance value A (such as the first path), and the buck-boost control module adjusts the power supply loop parameters to the values ​​corresponding to the steady-state loop of inductor A. The power supply loop parameters may include the switching rate, switching frequency, and switch drive current within the buck-boost control module, as well as the threshold parameters for loop monitoring. The above parameters are all internal parameters of the buck-boost control module, not parameters of external devices, and are unrelated to the switch tube in the inductor selection module.

[0168] S220: Determine whether the initial brightness of the screen is greater than the target brightness.

[0169] In this step, it is necessary to determine whether the initial brightness is greater than the target brightness (or whether the initial load current is greater than the target current). The target brightness is the brightness corresponding to the intersection of the efficiency curve of the first path and the efficiency curve of the second path, and the target current is the current corresponding to the intersection of the efficiency curve of the first path and the efficiency curve of the second path. For example, as shown in Figure 8, the target brightness is D nit, the target current is C mA, the efficiency curve of the first path is curve A, and the efficiency curve of the second path is curve B.

[0170] If the initial screen brightness is greater than the target brightness, S230 may be executed, indicating that the screen's operating state needs to be switched. For example, the path may be switched from the first path to the second path, thereby switching the screen's high-efficiency operating range from inductor high-efficiency region A to inductor high-efficiency region B. If the initial screen brightness is less than or equal to the target brightness, the screen's operating state does not need to be switched, and S240 may be executed.

[0171] S230: If the initial brightness of the screen is greater than the target brightness, a first control signal is sent to the inductor selection module, and a second control signal is sent to the buck-boost control module. The first control signal is used to instruct the inductor selection module to switch the first path to the second path, and the second control signal is used to indicate the power supply loop parameters corresponding to the second path, wherein the second path has a second inductor.

[0172] The specific content of this step can be found in S120 and will not be repeated here.

[0173] Furthermore, after executing S230 , S231 to S233 may be continued to be executed.

[0174] S231, determining whether the screen brightness changes.

[0175] In this step, it is necessary to determine whether the screen brightness has changed. If it is determined that the screen brightness has changed, S232 is executed, that is, it is necessary to further confirm whether the changed screen brightness is greater than the target brightness; if the screen brightness has not changed, S232 is not executed.

[0176] Furthermore, if it is determined that the brightness after the change is greater than the target brightness (or it is determined whether the load current after the change is greater than the target current), it means that the brightness after the change is still within the brightness range corresponding to the high-efficiency working interval under the second channel, and there is no need to switch the channel inductance from the second inductance to the first inductance, that is, there is no need to execute S233.

[0177] If it is determined that the changed brightness is less than or equal to the target brightness (or if it is determined that the changed load current is less than or equal to the target current), S233 is executed: a third control signal is sent to the inductor selection module, and a fourth control signal is sent to the buck-boost control module. The third control signal is used to instruct the inductor selection module to switch the second path to the first path, and the fourth control signal is used to indicate the power supply loop parameters corresponding to the first path.

[0178] In S233, the third control signal may also be a digital signal (0 or 1). If the first control signal is 0, the third control signal is 1, and if the first control signal is 1, the third control signal is 0. Whether to send 1 or 0 is determined by the inductance control module (SOC or MCU) based on the OLED screen brightness or load current.

[0179] After executing S220 , if the initial brightness of the screen is less than or equal to the target brightness, it means that there is no need to switch the working state of the screen, and the process can continue to execute S240 : determining whether the screen brightness has changed.

[0180] If it is determined that the screen brightness has changed, S241 may be continued to be executed to determine whether the changed brightness is greater than the target brightness.

[0181] If it is determined that the brightness after the change is less than or equal to the target brightness (or it is determined whether the load current after the change is less than or equal to the target current), it means that the brightness after the change is still within the brightness range corresponding to the high-efficiency working range under the first path, and there is no need to switch the path inductance from the first inductance to the second inductance.

[0182] If it is determined that the changed brightness is greater than the target brightness (or if it is determined that the changed load current is greater than the target current), S242 is executed: a first control signal is sent to the inductor selection module, and a second control signal is sent to the buck-boost control module. The first control signal is used to instruct the inductor selection module to switch the first path to the second path, and the second control signal is used to indicate the power supply loop parameters corresponding to the second path.

[0183] It should be understood that the second path has a second inductance, that is, the second path can be a path corresponding to the second inductance. For example, as shown in Figure 5 or Figure 6, the second path can be a path formed by the switch uniformly switching upward or connecting the inductance above each path, and the inductance corresponding to the second path is the second inductance.

[0184] For example, as shown in FIG8 , when it is determined that the changed screen brightness is greater than the target brightness D nit, it means that the screen brightness has changed from less than D nit to greater than D nit. Therefore, the switch can be switched to change the inductance in the path, so that the high-efficiency working range changes from the A inductor high-efficiency zone to the B inductor high-efficiency zone. The corresponding power supply loop parameters will also be adjusted from the original power supply loop parameters corresponding to the A inductor to the power supply loop parameters corresponding to the B inductor, and the inductance control module can send the adjusted power supply loop parameters to the buck-boost control module, and the power supply loop parameters can be carried in the second control signal.

[0185] It should be noted that the control method provided in the embodiment of the present application can switch different inductance paths under different screen brightness, increase the number of high-efficiency working points, and enable the screen to operate within the high-efficiency working range under different screen brightness, thereby reducing the screen power consumption and the heat generation of the electronic device, achieving the most efficient power supply, and achieving the purpose of reducing system power consumption.

[0186] Figure 10 is a schematic diagram of an inductance control module provided in an embodiment of the present application. This inductance control module 300 can have the functionality of the inductance control module in the aforementioned method embodiment and can be used to execute the steps performed by the inductance control module in the aforementioned method embodiment. This functionality can be implemented in hardware, software, or hardware executing corresponding software implementations. The hardware or software includes one or more units corresponding to the aforementioned functionality.

[0187] The inductance control module 300 may include a detection unit 310, a processing unit 320 and a transmission unit 330. The detection unit 310 is used to detect that the brightness of the screen changes from a first brightness to a second brightness, where the first brightness is within a brightness range corresponding to an efficient working interval under a first path, and the first path has a first inductance; the processing unit 320 is used to determine that the second brightness is greater than a target brightness, and the target brightness is greater than the first brightness, and the target brightness is the brightness corresponding to the intersection of an efficiency curve of the first path and an efficiency curve of the second path; the transmission unit 330 is used to send a first control signal to the inductance selection module, and the first control signal is used to instruct the inductance selection module to switch the first path to a second path, and the second path has a second inductance, and the second inductance has a different inductance value from the first inductance.

[0188] In some embodiments, the processing unit 320 is further used to determine that the second brightness is greater than the target brightness, and the transmission unit 330 is further used to send a second control signal to the buck-boost control module, where the second control signal is used to indicate the power supply loop parameters corresponding to the second path.

[0189] In some embodiments, the processing unit 320 is further configured to determine that if the second brightness is less than or equal to the target brightness, the screen continues to operate within the high-efficiency working range corresponding to the first channel.

[0190] In some embodiments, before detecting that the brightness of the screen changes from a first brightness to a second brightness, the detection unit 310 is also used to detect that the screen is initially lit, and the screen is defaulted to be in the high-efficiency working range corresponding to the first channel; the processing unit 320 is also used to determine whether the initial brightness of the screen is greater than the target brightness. If the initial brightness of the screen is greater than the target brightness, the transmission unit 330 is also used to send a first control signal to the inductor selection module and a second control signal to the buck-boost control module.

[0191] In addition, an embodiment of the present application provides an electronic device, which may be, for example, an electronic device with an OLED display, such as a mobile phone, a computer, etc. In this electronic device, a system architecture as shown in Figure 4 may be used, or a circuit topology architecture as shown in Figure 5 or Figure 6 may be used. This application does not limit this.

[0192] In addition, an embodiment of the present application further provides an electronic device, which includes a processor and a memory, wherein the memory is used to store program instructions, and the processor is used to call the program instructions to execute the above-mentioned related method steps to implement the control method in the above-mentioned embodiment.

[0193] An embodiment of the present application further provides a computer-readable storage medium, in which computer instructions are stored. When the computer instructions are executed on an electronic device, the electronic device executes the above-mentioned related method steps to implement the control method in the above-mentioned embodiment.

[0194] An embodiment of the present application further provides a computer program product. When the computer program product is run on a computer, the computer is caused to execute the above-mentioned related steps to implement the control method in the above-mentioned embodiment.

[0195] In addition, embodiments of the present application further provide a device, which may be a chip, component, or module, and may include a processor and a memory connected thereto. The memory is configured to store computer-executable instructions. When the device is in operation, the processor may execute the computer-executable instructions stored in the memory, causing the chip to perform the control methods described in the aforementioned method embodiments.

[0196] Among them, the electronic device, computer-readable storage medium, computer program product or chip provided in this embodiment are all used to execute the corresponding methods provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding methods provided above, and will not be repeated here.

[0197] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0198] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0199] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0200] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0201] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0202] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0203] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A power supply device for an organic light emitting diode (OLED) screen, characterized in that: include: Inductor selection module, buck-boost control module, inductor control module and voltage compensation stabilization module, among which, The inductance selection module is used to control the switching of the switch tube to select paths with different inductance values; The buck-boost control module is electrically connected to the inductor selection module, and is configured to output an output voltage to the OLED screen that is lower or higher than the input voltage; The inductance control module is in communication with the inductance selection module and is used to control the inductance selection module to select a path corresponding to a target inductance value; The inductance control module is further communicatively connected to the buck-boost control module, and is configured to transmit power supply loop parameters to the buck-boost control module to maintain the stability of the output voltage; The voltage compensation stabilization module is electrically connected to the buck-boost control module and is located at the output end of the buck-boost control module, and is used to maintain the stability of the transient output voltage of the inductor selection module when switching the switch tube.

2. The power supply device according to claim 1, characterized in that: The inductor selection module includes a plurality of parallel paths, and each parallel path includes a plurality of inductors and a plurality of switching tubes, wherein the plurality of inductors include a first inductor and a second inductor, and the plurality of switching tubes include a first switching tube and a second switching tube, the first inductor and the second inductor are arranged in parallel, the inductance value of the first inductor is different from the inductance value of the second inductor, and the first switching tube and the second switching tube are respectively located at both ends of the first inductor and the second inductor; In response to the brightness of the OLED screen being less than or equal to a first threshold, the inductor control module is configured to control the inductor selection module to switch to a first path corresponding to the first inductor, and transmit power supply loop parameters corresponding to the first path to the buck-boost control module. The inductor selection module is configured to connect the first switching transistor and the second switching transistor to both ends of the first inductor, and the buck-boost control module is configured to adjust the power supply loop parameters to those corresponding to the first path. In response to the brightness of the OLED screen being greater than the first threshold, the inductor control module is used to control the inductor selection module to switch to the second path corresponding to the second inductor, and transmit the power supply loop parameters corresponding to the second path to the buck-boost control module. The inductor selection module is used to connect the first switching tube and the second switching tube to the two ends of the second inductor, and the buck-boost control module is used to adjust the power supply loop parameters to the power supply loop parameters corresponding to the second path.

3. The power supply device according to claim 2, characterized in that: The power supply system also includes a decoder, which is located between the inductance selection module and the inductance control module. The inductance control module sends a control signal to the inductance selection module through the decoder. The decoder is used to reduce the use of the general input and output interface GPIO of the inductance control module.

4. The power supply device according to claim 1, wherein: The inductor selection module includes a plurality of parallel paths, and each parallel path includes a plurality of inductors and a third switching tube, wherein the plurality of inductors include a third inductor and a fourth inductor, the third inductor and the fourth inductor are arranged in series, and the third switching tube is located between the third inductor and the fourth inductor; In response to the brightness of the OLED screen being less than or equal to a second threshold, the inductor control module is configured to control the inductor selection module to switch to a third path corresponding to the third inductor, and transmit power supply loop parameters corresponding to the third path to the buck-boost control module. The inductor selection module is configured to connect the first switch tube to the third path having the third inductor, and the buck-boost switch control module is configured to adjust the power supply loop parameters to those corresponding to the third path. In response to the brightness of the OLED screen being greater than the second threshold, the inductor control module is used to control the inductor selection module to switch to the fourth path, and transmit the power supply loop parameters corresponding to the fourth path to the buck-boost control module. The fourth path has a third inductor and a fourth inductor. The inductor selection module is used to connect the third switch tube to the fourth path, and the buck-boost control module is used to adjust the power supply loop parameters to the power supply loop parameters corresponding to the fourth path.

5. The power supply device according to any one of claims 1 to 4, characterized in that: The voltage compensation stabilization module includes a capacitor, and the capacitance of the capacitor is determined according to the switching speed and / or switching duration of the switch tube of the inductance selection module.

6. The power supply device according to any one of claims 1 to 5, characterized in that: The inductance control module includes a system-on-chip (SOC) or a microcontroller unit (MCU).

7. The power supply device according to any one of claims 1 to 6, characterized in that: The buck-boost control module is used to output ELVDD, ELVSS and AVDD power supplies to the OLED screen.

8. An electronic device, characterized in that: The device comprises an organic light emitting diode (OLED) display screen and a power supply device according to any one of claims 1 to 7, wherein the power supply device is used to supply power to the OLED display screen.

9. A method for controlling power supply of an organic light emitting diode (OLED) screen, characterized in that: include: detecting that the brightness of the screen changes from a first brightness to a second brightness, wherein the first brightness is within a brightness range corresponding to a high-efficiency operating interval under a first path, and the first path has a first inductance; Determining that the second brightness is greater than a target brightness, where the target brightness is greater than the first brightness, where the target brightness is a brightness corresponding to an intersection of an efficiency curve of the first path and an efficiency curve of the second path, sending a first control signal to an inductor selection module, where the first control signal is used to instruct the inductor selection module to switch the first path to a second path, where the second path has a second inductor, and where the second inductor has an inductance value different from that of the first inductor.

10. The control method according to claim 9, characterized in that: The method further comprises: It is determined that the second brightness is greater than the target brightness, and a second control signal is sent to the buck-boost control module, where the second control signal is used to indicate a power supply loop parameter corresponding to the second path.

11. The control method according to claim 9 or 10, characterized in that: The method further comprises: If it is determined that the second brightness is less than or equal to the target brightness, the screen continues to operate in the high-efficiency working range corresponding to the first path.

12. The control method according to claim 10 or 11, characterized in that: Before detecting that the brightness of the screen changes from the first brightness to the second brightness, the method further includes: detecting that the screen is initially lit up, assuming that the screen is in the efficient working range corresponding to the first path; Determine whether the initial brightness of the screen is greater than the target brightness; if the initial brightness of the screen is greater than the target brightness, send the first control signal to the inductor selection module and send the second control signal to the buck-boost control module.

13. An inductance control module, characterized in that: The method comprises means for implementing the method according to any one of claims 9 to 12.

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