Power supply circuit and electronic equipment

Abstract

The invention discloses a power supply circuit and electronic equipment, and relates to the technical field of display. The power circuit comprises a first power module and a second power module. The input end of the first power module is used for receiving power voltage. The output end of the first power module is connected with the input end of the second power module, the output end of the second power module is used for providing power supply voltage for the display driving module, and the display driving module is used for driving a screen to display images. Wherein under the condition that the at least two strings of batteries provide a power supply voltage with a wide input voltage range, the first power supply module is added, the power supply voltage is subjected to voltage reduction conversion, the second power supply module is subjected to voltage boosting conversion to form a power supply voltage, and the power supply voltage enables the display driving module to drive the screen to display an image. The power supply circuit can meet low-voltage-withstanding power supply, and the power supply voltage is firstly reduced and then increased, so that the lowest power supply voltage of the display driving module can be met, the voltage is reduced when a screen is in light load, the output power is increased, and the power supply efficiency in light load is improved.

Description

Technical Field

[0001] This application relates to the field of display technologies, and particularly to a power supply circuit and an electronic device. Background Art

[0002] Organic light-emitting diodes (OLEDs) have the advantages of self-luminescence, no need for backlight, no need for color filters and liquid crystals, and are superior to traditional liquid crystal displays (LCDs) and light emitting diodes (LEDs) in terms of image quality, response speed, thickness, and viewing angle. Therefore, they have been widely used in recent years.

[0003] With the development of display technologies, OLED screens are widely used in mobile phones, digital video cameras, laptop computers, televisions, etc. In electronic devices using OLED screens, the power efficiency of the power supply for driving the OLED screen changes according to the degree of load of the electronic device, thereby affecting the battery life of the electronic device. Summary of the Invention

[0004] This application provides a power supply circuit and an electronic device for improving the power efficiency of the power supply in OLED display technologies when the display screen is under different loads, and for selecting the optimal efficiency of the power supply.

[0005] The technical solutions are as follows:

[0006] In a first aspect, an embodiment of this application provides a power supply circuit, which includes: a first power supply module and a second power supply module.

[0007] The input end of the first power supply module is used to receive a power supply voltage, which is provided by at least two strings of batteries. The output end of the first power supply module is connected to the input end of the second power supply module. The output end of the second power supply module is used to provide a power supply voltage for a display driving module, and the display driving module is used to drive the screen to display images.

[0008] The first power supply module is used to step down and convert the power supply voltage into a regulated voltage, and the second power supply module is used to step up and convert the regulated voltage into a power supply voltage, and the power supply voltage is used to enable the display driving module to drive an OLED display screen.

[0009] In this application, when at least two strings of batteries provide a power supply voltage with a wide input voltage range, a first power supply module is added before the second power supply module to step down the power supply voltage and convert it into a regulated voltage. Then, the second power supply module boosts the regulated voltage to convert it into a supply voltage, and the supply voltage is transmitted to the display driving module so that the display driving module can drive the screen. Since the first power supply module steps down the power supply voltage, the power supply circuit can meet the low withstand voltage power supply. And the power supply voltage is first stepped down by the first power supply module and then stepped up by the second power supply module, which can meet the minimum supply voltage of the display driving module, reduce the voltage when the screen is lightly loaded, and increase the output power, thereby improving the power supply efficiency under light load.

[0010] In a possible implementation manner of this application, the first power supply module includes a synchronous buck regulator module and / or a switched-capacitor converter module. The synchronous buck regulator module is used to convert the power supply voltage into a first regulated voltage, and the switched-capacitor converter module is used to convert the power supply voltage into a second regulated voltage.

[0011] As an example, the first power supply module includes a synchronous buck regulator module to supply power to a low withstand voltage OLED power supply solution. Through a two-stage power supply design, the input withstand voltage problem of the low withstand voltage OLED backlight power supply module is solved, and the power supply efficiency under light load is improved.

[0012] As an example, the first power supply module includes a switched-capacitor converter module to supply power to a low withstand voltage OLED power supply solution. Through a two-stage power supply design, the input withstand voltage problem of the low withstand voltage OLED backlight power supply module is solved, and the power supply efficiency under light load and partial heavy load is improved.

[0013] In a possible implementation manner of this application, when the first power supply module includes a synchronous buck regulator module and a switched-capacitor converter module, the first power supply module further includes a detection module and a power path management module. The input end of the synchronous buck regulator module and the input end of the switched-capacitor converter module are used to receive the power supply voltage. The output end of the synchronous buck regulator module is connected to the first input end of the power path management module, the output end of the switched-capacitor converter module is connected to the second input end of the power path management module, and the output end of the power path management module is connected to the input end of the second power supply module. The output end of the detection module is connected to the third input end of the power path management module. The detection module is used to control the power path management module to output the first regulated voltage output by the synchronous buck regulator module or the second regulated voltage output by the switched-capacitor converter module.

[0014] In a possible implementation of the present application, the detection module is used to detect the power efficiency set under different loads. The power efficiency set includes the power efficiency set of the first path and the power efficiency set of the second path. The first path is the path where the synchronous buck regulator module is located, and the second path is the path where the switched-capacitor converter module is located. The detection module is used to detect the load information and the power supply voltage, and control the power path management module to output the first regulated voltage or the second regulated voltage according to the load information, the power supply voltage, and the power efficiency set.

[0015] In the embodiment of the present application, the power efficiency set is obtained by detecting the power efficiency of different paths under different loads. For example, a power efficiency table or a power efficiency curve. Then, the load information and the power supply voltage of different paths are measured. By comparing with the power efficiency set, the path with high efficiency can be selected.

[0016] In a possible implementation of the present application, the detection module is used to detect the power efficiency of the first path and the power efficiency of the second path. When the power efficiency of the first path is greater than the power efficiency of the second path, the power path management module outputs the first regulated voltage. When the power efficiency of the second path is greater than the power efficiency of the first path, the power path management module outputs the second regulated voltage. When the power efficiency of the second path is equal to the power efficiency of the first path, the power path management module outputs the first regulated voltage or the second regulated voltage. By directly detecting the power efficiency of different paths and directly comparing them, the power supply path with the optimal efficiency can be selected.

[0017] In a possible implementation of the present application, the first end of the first diode is connected to the output end of the synchronous buck regulator module, and the second end is connected to the second power supply module. The first end of the second diode is connected to the output end of the switched-capacitor converter module, and the second end is connected to the second power supply module. As an example, the first diode and the second diode can be ideal diodes.

[0018] In a possible implementation of the present application, the power supply circuit further includes a main chip, which is connected to the display driving module. The main chip is used to send image information to the display driving module, and the image information is used to display an image on the OLED screen.

[0019] In a possible implementation of the present application, the second power supply module includes a synchronous boost regulator and a synchronous inverting boost controller. The input end of the synchronous boost regulator is connected to the output end of the power path management module. The output end of the synchronous boost regulator is used to send a power supply voltage to the display driving module, and the synchronous inverting boost controller is used to receive the feedback voltage sent by the display driving module.

[0020] Second aspect, embodiments of the present application provide a power supply device, and the power supply device includes the power supply circuit as described in the first aspect and any one of the first aspect.

[0021] Third aspect, embodiments of the present application provide a display device, and the display device includes an OLED display screen and the power supply device as described in the second aspect.

[0022] Fourth aspect, embodiments of the present application provide an electronic device, and the electronic device includes a battery module, a display module, and the power supply circuit as described in the first aspect and any one of the first aspect. The battery module is used to provide a power supply voltage for the power supply circuit, and the display module is used to display images.

[0023] In a possible implementation manner of the present application, the display module includes: a display driving module and a display screen. The display driving module is used to drive the display screen to display images. For example, the display screen can be an OLED display screen.

[0024] Any of the above-provided devices or computer storage media or computer program products or chips or communication systems are used to execute the corresponding methods provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects of the corresponding solutions in the corresponding methods provided above, and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of a power supply circuit of a notebook computer with an OLED screen provided by the present application;

[0026] Figure 2 is a schematic diagram of a power supply circuit with a wide input voltage range provided by the present application;

[0027] Figure 3 is a schematic diagram of a power supply circuit with a narrow input voltage range provided by embodiments of the present application;

[0028] Figure 4 is a schematic diagram of the structure of a power supply circuit provided by embodiments of the present application;

[0029] Figure 5 is a schematic diagram of the structure of a power supply circuit with a synchronous buck regulator module provided by embodiments of the present application;

[0030] Figure 6 is a comparative diagram of power efficiency curves provided by embodiments of the present application;

[0031] Figure 7 is a schematic diagram of the structure of a power supply circuit with a switched-capacitor converter module provided by embodiments of the present application;

[0032] Figure 8It is another power efficiency curve comparison diagram provided by an embodiment of the present application;

[0033] Figure 9 It is a schematic structural diagram of another power supply circuit provided by an embodiment of the present application;

[0034] Figure 10 It is a power efficiency curve diagram provided by an embodiment of the present application;

[0035] Figure 11 It is a schematic circuit structure diagram of a power supply circuit provided by an embodiment of the present application. Detailed implementation manners

[0036] For the convenience of clearly describing the technical solutions of the embodiments of the present application, in the embodiments of the present application, terms such as "first" and "second" are used to distinguish identical or similar items with basically the same functions and effects. For example, the first power module and the second power module are only used to distinguish different power modules, and do not limit their sequence. Those skilled in the art can understand that terms such as "first" and "second" do not limit the quantity and execution order, and terms such as "first" and "second" do not necessarily limit being different.

[0037] It should be noted that in the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Exactly, using words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner.

[0038] In the present application, "at least one" means one or more, and "a plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after. "At least one (item)" or its similar expression below refers to any combination of these items, including any combination of single item (item) or plural items (items). For example, at least one (item) of a, b, or c can represent: a, b, c, a - b, a - c, b - c, or a - b - c, where a, b, c can be single or multiple.

[0039] Currently, organic light-emitting diode (OLED) technology is widely used in the display field, such as electronic devices like laptop computers, televisions, mobile phones, etc. Taking a laptop computer as an example, as Figure 1 shownFigure 1 The schematic diagram of the power supply circuit of a notebook computer with an OLED screen is shown, including a battery 110 and a display driving module 120. The battery 110 is used to provide a driving voltage for the display driving module 120, and the display driving module 120 can drive the OLED screen 130 to display images. However, the power efficiency of this power supply circuit is affected by the load level of the OLED screen. That is, when the OLED screen is lightly loaded (low brightness), the power efficiency will decrease. For example, when the input power of the power supply remains unchanged, when the notebook computer is playing a video, the OLED screen is lightly loaded, the output voltage remains unchanged, but the current becomes smaller, resulting in a smaller output power, thus reducing the power efficiency, which has a greater impact on the battery life of the notebook computer.

[0040] To solve the problem of the power efficiency of the power supply circuit, there are mainly two solutions in the prior art: a wide input voltage range and a narrow input voltage range. The following describes the two power supply solutions.

[0041] Solution 1: Wide input voltage range

[0042] As Figure 2 shown is the schematic diagram of a power supply circuit with a wide input voltage range provided by an embodiment of the present application, including a battery 210, a high-voltage-resistant OLED backlight power supply module 220, a display driving module 230, and an OLED screen 240. Among them, the battery 210 includes two or more strings of battery cells. The battery 210 is used to provide a power supply voltage for the high-voltage-resistant OLED backlight power supply module 220. The high-voltage-resistant OLED backlight power supply module 220 is used to convert the power supply voltage into a driving voltage. The driving voltage is used to drive the display driving module 230, and the display driving module 230 is used to drive the OLED screen 240 to display images.

[0043] Among them, the high-voltage-resistant OLED backlight power supply module 220 includes a synchronous buck regulator 2201 and a synchronous buck-boost controller 2202. The input end of the synchronous buck regulator 2201 is connected to the battery 210 to receive the power supply voltage. The output end of the synchronous buck regulator 2201 is connected to the display driving module 230 to output the driving voltage. The synchronous buck-boost controller 2202 is connected between the synchronous buck regulator 2201 and the display driving module 230 for voltage regulation control.

[0044] The solution with a wide input voltage range is mainly applied to large-size OLED products, such as TVs, laptops, etc. However, since the battery 210 includes at least two strings of battery cells, it has a relatively high input voltage. In this case, when the load level of the OLED product is relatively high (large current), due to both the voltage and current being large, the output power of the power supply is relatively high, that is, the power supply efficiency is also relatively high; but when the load level is relatively low (small current), due to the large voltage and small current, the output power of the power supply is relatively low, that is, the power supply efficiency is relatively low.

[0045] Solution 2: Narrow input voltage range

[0046] As Figure 3 shown is a schematic diagram of a power supply circuit with a narrow input voltage range provided by an embodiment of the present application, including a battery 310, a low-voltage-resistant OLED backlight power supply module 320, a display driving module 330, and an OLED screen 340. Among them, the battery 310 includes a string of battery cells, and the battery 310 is used to provide a supply voltage for the low-voltage-resistant OLED backlight power supply module 320. The low-voltage-resistant OLED backlight power supply module 320 is used to convert the supply voltage into a driving voltage, and the driving voltage is used to drive the display driving module 330. The display driving module 330 is used to drive the OLED screen 340 to display an image.

[0047] Among them, the low-voltage-resistant OLED backlight power supply module 320 includes a synchronous boost regulator 3201 and a synchronous buck-boost controller 3202. The input end of the synchronous boost regulator 3201 is connected to the battery 310 to receive the supply voltage, and the output end of the synchronous boost regulator 3201 is connected to the display driving module 330 to output the driving voltage. The synchronous buck-boost controller 3202 is connected between the synchronous boost regulator 3201 and the display driving module 330 for voltage regulation control.

[0048] The solution with a narrow input voltage range is mainly applied to small and medium-sized OLED products, such as mobile phones, tablets, etc. Since the low-voltage-resistant OLED backlight power supply module 320 performs boost and voltage regulation processing on the supply voltage, the efficiency of the power supply circuit of the OLED product is relatively high regardless of whether the load level is high or low. However, the low-voltage-resistant OLED backlight power supply module 320 cannot be directly connected to multiple strings of battery cells and can only be connected to a string of battery cells, resulting in insufficient voltage resistance for this solution. Moreover, when the battery power is low, or when the power supply input voltage is low due to large changes in the load of other modules of the OLED product, the power supply efficiency will also decrease.

[0049] As can be seen from the above, there is currently a problem of unstable power supply efficiency in the power supply circuit of OLED products. When the load level is low or high, it may cause low power supply efficiency, and the power supply circuit cannot select the optimal efficiency for power supply.

[0050] To solve the above problems, the present application proposes a power supply circuit and an electronic device. Through a two-stage power supply scheme, the power supply efficiency under different load levels is improved, and through the detection of the system or device state, the optimal power supply method is judged and selected according to a single or multiple states.

[0051] The following takes an OLED product as an example of a notebook computer to describe the OLED power supply circuit of the notebook computer. As Figure 4 shown, Figure 4 FIG. is a schematic structural diagram of a power supply circuit provided by an embodiment of the present application. The power supply circuit includes: a first power module 420 and a second power module 430. The input end of the first power module 420 is used to receive a power supply voltage, and the power supply voltage is provided by at least two strings of batteries. The output end of the first power module 420 is connected to the input end of the second power module 430, and the output end of the second power module 430 is used to provide a power supply voltage for the display driving module 440, and the display driving module is used to drive the screen 450 to display an image.

[0052] The first power module 420 is used to step down and convert the power supply voltage into a regulated voltage, and the second power module 430 is used to step up and convert the regulated voltage into a power supply voltage, and the power supply voltage is used to drive the display driving module 440.

[0053] In a possible implementation manner, the first power module 420 and the second power module 430 are integrated on a printed circuit board, or can be integrated on a flexible circuit board, or can be other circuit boards, which is not limited in the embodiments of the present application.

[0054] In a possible embodiment, the power supply voltage is provided by the battery module 410. As Figure 4 shown, the output end of the battery module 410 is connected to the input end of the first power module 420. The output end of the second power module 430 is connected to the display driving module 440.

[0055] Among them, the battery module 410 includes at least two strings of batteries, which are used to provide a power supply voltage with a wide input voltage range, and can also provide power supply voltages at multiple levels, such as 12.9V, 11.4V, and 9.9V.

[0056] Among them, the first power module 420 can convert the power supply voltage into a regulated voltage, step down the power supply voltage through the first power module 420, and stabilize it within a preset range.

[0057] As an example, as Figure 5As shown, the first power supply module 420 is a synchronous buck regulator module 4201. The output terminal of the battery module 410 is connected to the input terminal of the synchronous buck regulator module 4201, and the output terminal of the synchronous buck regulator module 4201 is connected to the second power supply module 430. The synchronous buck regulator module 4201 is used to convert the power supply voltage into a first regulated voltage. At this time, the synchronous buck regulator module 4201 serves as a DC synchronous buck regulated power supply to provide voltage for the second power supply module 430.

[0058] For example, the battery module 410 can provide three power supply voltage levels with voltage values of 12.9V, 11.4V, and 9.9V respectively. The synchronous buck regulator module 4201 converts the power supply voltage into a first regulated voltage according to any one of the three voltage values, and its voltage value is 4.3V. As Figure 6 Shown is a comparison chart of power supply efficiency curves. Among them, the horizontal axis represents current, and the vertical axis represents power supply efficiency. Curve 1 is the change curve of the power supply efficiency after adding the synchronous buck regulator module 4201, and Curve 2 is the power supply efficiency curve of the above-mentioned first solution. It can be seen from the figure that when the current is low, that is, under light load, the power supply efficiency is significantly improved.

[0059] As another example, as Figure 7 Shown, the first power supply module 420 is a switched capacitor converter module 4202. The output terminal of the battery module 410 is connected to the input terminal of the switched capacitor converter module 4202, and the output terminal of the switched capacitor converter module 4202 is connected to the second power supply module 430. The switched capacitor converter module 4202 is used to convert the power supply voltage into a second regulated voltage. At this time, the switched capacitor converter module 4202 serves as a DC switched capacitor conversion power supply to provide voltage for the second power supply module 430.

[0060] For example, the battery module 410 can provide three power supply voltage levels with voltage values of 12.9V, 11.4V, and 9.9V respectively. The voltage conversion ratio of the switched capacitor converter module 4202 is 3:1. The second regulated voltage converted from the power supply voltage has voltage values corresponding to the three levels of 4.3V, 3.8V, and 3.3V respectively. As Figure 8 Shown is a comparison chart of power supply efficiency curves. Curves 1 - 3 are the change curves of the power supply efficiency after adding the switched capacitor converter module 4202, which are the high battery level (Curve 1), medium battery level (Curve 2), and low battery level (Curve 3) of the battery module respectively. Curve 4 is the power supply efficiency curve of the above-mentioned first solution. It can be seen from the figure that when the current is low, that is, under light load, the power supply efficiency is significantly improved, and in part of the heavy load, the power supply efficiency is also improved.

[0061] Among them, the power supply voltage is a voltage obtained by boosting the regulated voltage generated by the first power supply module 420 and stabilizing it within a preset range. For example, taking the first power supply module 420 as the synchronous buck regulator module 4201, the synchronous buck regulator module 4201 converts the power supply voltage into a first regulated voltage with a voltage value of 4.3V, and the second power supply module 430 converts the first regulated voltage into a power supply voltage with a voltage value of 7V.

[0062] As an example, the second power supply module 430 is a synchronous boost regulator. The output end of the first power supply module 420 is connected to the input end of the synchronous boost regulator, and the output end of the synchronous boost regulator is connected to the display driving module 440.

[0063] In this application, when the battery module 410 provides a power supply voltage with a wide input voltage range, a first power supply module 420 is added before the second power supply module 430 to perform a buck conversion on the power supply voltage and convert it into a regulated voltage. Then, the second power supply module 430 performs a boost conversion on the regulated voltage to convert it into a power supply voltage, and the power supply voltage is transmitted to the display driving module 440, enabling the display driving module 440 to drive the OLED screen. Since the first power supply module 420 performs a buck conversion on the power supply voltage, the power supply circuit can meet the low withstand voltage power supply. And the power supply voltage is first stepped down by the first power supply module 420 and then stepped up by the second power supply module 430, which can meet the minimum power supply voltage of the display driving module, reduce the voltage of the OLED under light load, and increase the output power, thereby improving the power efficiency of the OLED screen under light load.

[0064] As Figure 9 shown, Figure 9 FIG. is a schematic structural diagram of a power supply circuit provided by an embodiment of the present application. When the first power supply module 420 includes a synchronous buck regulator module 4201 and a switched-capacitor converter module 4202, the first power supply module 420 further includes: a detection module 4203 and a power path management module 4204.

[0065] The input end of the synchronous buck regulator module 4201 and the input end of the switched-capacitor converter module 4202 are used to receive the power supply voltage. The output end of the synchronous buck regulator module 4201 is connected to the first input end of the power path management module 4204, the output end of the switched-capacitor converter module 4202 is connected to the second input end of the power path management module 4204, and the output end of the power path management module 4204 is connected to the input end of the second power supply module 430.

[0066] As an example, as Figure 9 described, the output end of the battery module 410 is connected to the input end of the synchronous buck regulator module 4201 and the input end of the switched-capacitor converter module 4202.

[0067] The output end of the detection module 4203 is connected to the third input end of the power path management module 4204. The detection module 4203 is used to control the power path management module 4204 to output the first regulated voltage output by the synchronous buck regulator module 4201 or the second regulated voltage output by the switched-capacitor converter module 4202.

[0068] Among them, the first power module 420 may only include the synchronous buck regulator module 4201, may only include the switched-capacitor converter module 4202, or may also include the synchronous buck regulator module 4201 and the switched-capacitor converter module 4202. When the first power module 420 includes the synchronous buck regulator module 4201 and the switched-capacitor converter module 4202, the synchronous buck regulator module 4201 outputs the first regulated voltage, and the switched-capacitor converter module 4202 outputs the second regulated voltage.

[0069] In a possible embodiment of the present application, the detection module 4203 is used to detect the power efficiency set under different loads. The power efficiency set includes the power efficiency set of the first path and the power efficiency set of the second path. Among them, the first path is the path where the synchronous buck regulator module 4201 is located, and the second path is the path where the switched-capacitor converter module 4202 is located.

[0070] Among them, the power efficiency set includes multiple power efficiencies corresponding to the synchronous buck regulator module 4201 under different loads and multiple power efficiencies corresponding to the switched-capacitor converter module 4202 under different loads.

[0071] Among them, the detection module 4203 can calculate the power efficiency by detecting the input / output voltage and input / output current and calculating according to the input / output voltage and input / output current; it can also obtain the power efficiency by detecting the input / output efficiency; it can also calculate the input / output power by detecting the external resistor and obtain the power efficiency according to the input / output power.

[0072] It can be understood that there is a corresponding power efficiency for each load, and the multiple power efficiencies corresponding to multiple loads form a power efficiency set, such as a power efficiency curve.

[0073] For example, taking the power supply voltage Pbat provided by the battery module 410 including three gears of 12.9V, 11.4V, and 9.9V as an example, the first regulated voltage Pa output by the synchronous buck regulator module 4201 is 4.3V, and the second regulated voltages Pb output by the switched-capacitor converter module 4202 are 4.3V, 3.8V, and 3.3V. As Figure 10The shown power efficiency curve graph includes six curves. Curve Ea1 is the efficiency curve when the power supply voltage Pbat is 12.9V; Curve Ea2 is the efficiency curve when the power supply voltage Pbat is 11.4V; Curve Ea3 is the efficiency curve when the power supply voltage Pbat is 9.9V; Curve Eb1 is the efficiency curve when the power supply voltage Pbat is 12.9V; Curve Eb2 is the efficiency curve when the power supply voltage Pbat is 11.4V; Curve Eb3 is the efficiency curve when the power supply voltage Pbat is 9.9V.

[0074] Among them, the path can be understood as the channel through which the battery module 410 provides electrical energy for the display driving module 440.

[0075] For example, as Figure 9 shown, the battery module 410 provides the power supply voltage Pbat, the synchronous buck regulator module 4201 outputs the first regulated voltage Pa, the switched-capacitor converter module 4202 outputs the second regulated voltage Pb, the power path management module 4204 outputs the output voltage Po, and the second power supply module 430 outputs the supply voltage ELVDD. Then the first path is the power supply voltage Pbat, the first regulated voltage Pa, the output voltage Po, and the supply voltage ELVDD, and the second path is the power supply voltage Pbat, the second regulated voltage Pb, the output voltage Po, and the supply voltage ELVDD.

[0076] Optionally, the first regulated voltage output by the synchronous buck regulator module 4201 may not pass through the power path management module 4204 and can be directly transmitted to the second power supply module 430. For example, Figure 9 the path from point X at the output end of the synchronous buck regulator module 4201 in Figure 9 to point Y bypassing the power path management module 4204. Similarly, the second regulated voltage output by the switched-capacitor converter module 4202 may not pass through the power path management module 4204 and can be directly transmitted to the second power supply module 430. For example,

[0077] Optionally, the detection module 4203 is further configured to store the power efficiency sets under different loads. The power efficiency sets under different loads can be stored in the detection module 4203 in the form of a table, or in the form of a curve graph, or in other forms, which are not limited in the embodiments of the present application.

[0078] The detection module 4203 is configured to detect the load information and the power supply voltage, and control the power path management module 4204 to output the first regulated voltage or the second regulated voltage according to the load information, the power supply voltage, and the power efficiency sets.

[0079] Among them, the detection module 4203 can be a micro - controller unit (MCU). For example, the MCU can be used to store the power efficiency curve graph and the power efficiency table.

[0080] Among them, the load information is the load point (for example, current). By combining the load point with the power efficiency set, the power efficiency corresponding to the load point can be obtained. The load information can be detected by the detection module 4203 from the second power supply module 430, or detected from the detection display driving module 440.

[0081] In a possible implementation manner of the present application, the power efficiency curve is stored in the detection module 4203. The detection module 4203 is respectively connected to the battery module 410, the synchronous buck regulator module 4201, the switched - capacitor converter module 4202, the second power supply module 430, and the display driving module 440. Refer to Figure 9 , the steps for the detection module 4203 to control the power path management module 4204 to output the first regulated voltage or the second regulated voltage include:

[0082] Step S101: The detection module 4203 obtains the load information.

[0083] As an example, the detection module 4203 reads the brightness information of the OLED screen from the display driving module 440 through detection 4, and converts the power load point x1 according to the brightness information.

[0084] Among them, the detection module 4203 can also obtain the brightness information of the OLED screen from other modules, which is not limited in the embodiments of the present application.

[0085] As another example, the detection module 4203 obtains the power load point x1 from the second power supply module 430 through detection 5.

[0086] Step S102: The detection module 4203 detects the first regulated voltage and the second regulated voltage.

[0087] Among them, the first regulated voltage and the second regulated voltage can be obtained by detecting the power supply voltage Pbat, or can be directly obtained.

[0088] As an example, the detection module 4203 obtains the power supply voltage Pbat through detection 1, and then converts the first regulated voltage and the second regulated voltage according to the power supply voltage Pbat.

[0089] For example, if the detection module 4203 obtains the power supply voltage Pbat as 12.9V through detection 1, the first regulated voltage Pa can be determined to be 4.3V, and the second regulated voltage Pb can be determined to be 4.3V; if the detection module 4203 obtains the power supply voltage Pbat as 11.4V through detection 1, the first regulated voltage Pa can be determined to be 4.3V, and the second regulated voltage Pb can be determined to be 3.8V; if the detection module 4203 obtains the power supply voltage Pbat as 9.9V through detection 1, the first regulated voltage Pa can be determined to be 4.3V, and the second regulated voltage Pb can be determined to be 3.3V.

[0090] As another example, the detection module 4203 obtains the first regulated voltage from the synchronous buck regulator module 4201 through detection 2, and obtains the second regulated voltage from the switched-capacitor converter module 4202 through detection 3.

[0091] Step S103: The detection module 4203 determines the first efficiency point according to the first regulated voltage Pa and the power supply efficiency curve, and determines the second efficiency point according to the second regulated voltage and the power supply efficiency curve.

[0092] For example, the load information obtained by the detection module 4023 is the load point x1. The first regulated voltage Pa detected by the detection module 4023 is 4.3V obtained by stepping down the power supply voltage Pbat of 11.4V. Combining with the power supply efficiency curve shown in Figure 10 (the meaning of each curve in Figure 10 refers to the above embodiments), the curve Ea2 can be determined as the corresponding power supply efficiency curve. According to the load point x1, the first efficiency point Ea2-x1 can be determined. The second regulated voltage Pb detected by the detection module 4023 is 3.8V. Combining with the power supply efficiency curve shown in Figure 10 , the curve Eb2 can be determined as the corresponding power supply efficiency curve. According to the load point x1, the second efficiency point Eb2-x1 can be determined.

[0093] For example, the load information obtained by the detection module 4023 is the power supply load point x2. The same as the above embodiments, combining with the power supply efficiency curve shown in Figure 8 , the first efficiency point Ea2-x2 and the second efficiency point Eb2-x2 can be determined.

[0094] Step S104: The detection module 4203 compares the magnitudes of the first efficiency point and the second efficiency point, and controls the regulated voltage output by the power supply path management module 4204 according to the magnitudes of the first efficiency point and the second efficiency point.

[0095] Wherein, when the first efficiency point is greater than the second efficiency point, the detection module 4203 controls the power path management module 4204 to output the first regulated voltage. When the first efficiency point is less than the second efficiency point, the detection module 4203 controls the power path management module 4204 to output the second regulated voltage. When the first efficiency point is equal to the second efficiency point, the detection module 4203 controls the power path management module 4204 to output the first regulated voltage or the second regulated voltage.

[0096] For example, according to the above step S103, from Figure 10 it can be seen that when the load information is the load point x1, the first efficiency point Ea2-x1 is greater than the second efficiency point Eb2-x1, then the detection module 4203 controls the power path management module 4204 to output the first regulated voltage Pa.

[0097] For example, according to the above step S103, from Figure 10 it can be seen that when the load information is the load point x2, the first efficiency point Ea2-x2 is less than the second efficiency point Eb2-x2, then the detection module 4203 controls the power path management module 4204 to output the second regulated voltage Pb.

[0098] It should be noted that the first efficiency point and the second efficiency point may also be the same. In the case where the first efficiency point and the second efficiency point are the same, the detection module 4203 can control the power path management module 4204 to output the first regulated voltage Pa or the second regulated voltage Pb. For example, referring to Figure 10 , when the load information is the load point c, it can be seen that the two curves intersect, indicating that the first efficiency point and the second efficiency point are equal, denoted as Ea2b2-c.

[0099] In a possible embodiment of the present application, the detection module 4203 is used to detect the power efficiency of the first path and the power efficiency of the second path. When the power efficiency of the first path is greater than the power efficiency of the second path, the power path management module 4204 outputs the first regulated voltage. When the power efficiency of the second path is greater than the power efficiency of the first path, the power path management module 4204 outputs the second regulated voltage. When the power efficiency of the second path is equal to the power efficiency of the first path, the power path management module 4204 outputs the first regulated voltage or the second regulated voltage.

[0100] As an example, the power efficiency of the first path is the power efficiency of the path where the synchronous buck regulator module 4201 is located, which is determined by the efficiency of the synchronous buck regulator module 4201 and the efficiency of the second power module 430. The power efficiency of the second path is the power efficiency of the switched capacitor converter module 4202, which is determined by the efficiency of the switched capacitor converter module 4202 and the efficiency of the second power module 430.

[0101] Among them, the efficiency of the synchronous buck regulator module 4201 can be directly detected by the detection module 4203 for the synchronous buck regulator module 4201, the efficiency of the switched-capacitor converter module 4202 can be directly detected by the detection module 4203 for the switched-capacitor converter module 4202, and the efficiency of the second power supply module 430 can be directly detected for the second power supply module 430.

[0102] In a possible implementation manner of the present application, referring to Figure 9 , the detection module 4203 controls the power path management module 4204 to output a first regulated voltage or a second regulated voltage. The difference between this embodiment and the steps S101 to S104 described in the above embodiment is that the detection module 4203 obtains the power efficiency by detecting the input / output efficiency. The specific steps include:

[0103] Step S201: The detection module 4203 obtains the efficiency of the synchronous buck regulator module 4201 and the efficiency of the second power supply module 430.

[0104] For example, the detection module 4203 obtains the efficiency E1 from the synchronous buck regulator module 4201 by detecting 2. The detection module 4203 obtains the efficiency E1' from the second power supply module 430 by detecting 5.

[0105] Step S202: The detection module 4203 obtains the efficiency of the switched-capacitor converter module 4202 and the efficiency of the second power supply module 430.

[0106] For example, the detection module 4203 obtains the efficiency E2 from the switched-capacitor converter module 4202 by detecting 3. The detection module 4203 obtains the efficiency E2' from the second power supply module 430 by detecting 5.

[0107] Step S203: The detection module 4203 determines the first power efficiency according to the efficiency of the synchronous buck regulator module 4201 and the efficiency of the second power supply module 430, and determines the second power efficiency according to the efficiency of the switched-capacitor converter module 4202 and the efficiency of the second power supply module 430.

[0108] Among them, the power efficiency can be the product between the efficiencies. For example, the first power efficiency is the product of the efficiency of the synchronous buck regulator module 4201 and the efficiency of the second power supply module 430, or it can be other relationships, which are not limited in the embodiments of the present application.

[0109] For example, the detection module 4203 determines that the first power supply efficiency is E1*E1' according to the efficiency E1 of the synchronous buck regulator module 4201 and the efficiency E1' of the second power supply module 430, and determines that the second power supply efficiency is E2*E2' according to the efficiency E2 of the switched-capacitor converter module 4202 and the efficiency E2' of the second power supply module 430.

[0110] Step S204: The detection module 4203 compares the magnitudes of the first power supply efficiency and the second power supply efficiency, and controls the regulated voltage output by the power path management module 4204 according to the magnitudes of the first power supply efficiency and the second power supply efficiency.

[0111] Among them, when the first power supply efficiency is greater than the second power supply efficiency, the detection module 4203 controls the first regulated voltage output by the power path management module 4204; when the first power supply efficiency is less than the second power supply efficiency, the detection module 4203 controls the second regulated voltage output by the power path management module 4204; when the first power supply efficiency is equal to the second power supply efficiency, the detection module 4203 controls the power path management module 4204 to output the first regulated voltage or the second regulated voltage.

[0112] As another example, the power supply efficiency of the synchronous buck regulator module 4201 is determined by the input power of the synchronous buck regulator module 4201 and the output power of the second power supply module 430. The power supply efficiency of the switched-capacitor converter module 4202 is determined by the input power of the switched-capacitor converter module 4202 and the output power of the second power supply module 430.

[0113] Among them, the input power and the output power can be measured by the formula P = U*I.

[0114] For example, a series resistor R is added to the power input end of the synchronous buck regulator module 4021, the voltage at the input end is Va, and the voltage at the output end is Vb. Then, the input power Pin of the synchronous buck regulator module 4021 = Va*(Va - Vb) / R. The input power of the switched-capacitor converter module 4202 and the output power of the second power supply module 430 are the same by analogy and will not be elaborated here.

[0115] In a possible implementation manner of the present application, with reference to Figure 9 , the detection module 4203 controls the power path management module 4204 to output the first regulated voltage or the second regulated voltage. The difference between this embodiment and the steps S201 to S204 described in the above embodiment is that the detection module 4203 obtains the power supply efficiency by detecting the input / output power, and the specific steps include:

[0116] Step S301: The detection module 4203 obtains the input power of the synchronous buck regulator module 4201 and the output power of the second power supply module 430.

[0117] For example, the detection module 4203 obtains the input power P1 from the synchronous buck regulator module 4201 through detection 2. The detection module 4203 obtains the output power P1' from the second power supply module 430 through detection 5.

[0118] Step S302: The detection module 4203 obtains the input power of the switched-capacitor converter module 4202 and the output power of the second power supply module 430.

[0119] For example, the detection module 4203 obtains the input power P2 from the switched-capacitor converter module 4202 through detection 3. The detection module 4203 obtains the output power ratio P2' from the second power supply module 430 through detection 5.

[0120] Step S303: The detection module 4203 determines the first power supply efficiency according to the input power of the synchronous buck regulator module 4201 and the output power of the second power supply module 430, and determines the second power supply efficiency according to the input power of the switched-capacitor converter module 4202 and the output power of the second power supply module 430.

[0121] Wherein, the power supply efficiency is the ratio of the output power to the input power. For example, the first power supply efficiency is the ratio of the output power of the second power supply module 430 to the input power of the synchronous buck regulator module 4201.

[0122] For example, the detection module 4203 determines that the first power supply efficiency is P1' / P1 according to the input power P1 of the synchronous buck regulator module 4201 and the output power P1' of the second power supply module 430, and determines that the second power supply efficiency is P2' / P2 according to the input power P2 of the switched-capacitor converter module 4202 and the output power P2' of the second power supply module 430.

[0123] Step S304: The detection module 4203 compares the magnitudes of the first power supply efficiency and the second power supply efficiency, and controls the regulated voltage output by the power path management module 4204 according to the magnitudes of the first power supply efficiency and the second power supply efficiency.

[0124] The specific implementation is as described in the above embodiments and will not be elaborated here.

[0125] In a possible embodiment of the present application, as Figure 9 shown, the power path management module 4204 includes a first diode and a second diode. The first end of the first diode is connected to the output end of the synchronous buck regulator module 4201, and the second end is connected to the second power supply module 430. The first end of the second diode is connected to the output end of the switched-capacitor converter module 4202, and the second end is connected to the second power supply module 430.

[0126] Among them, both the first diode and the second diode are ideal diodes. For example, referring to Figure 11 , the first diode is ideal diode a, and the second diode is ideal diode b.

[0127] It should be noted that other electronic components that can control the conduction or cutoff of the circuit can also be included in the power path management module 4204, which is not limited in the embodiments of the present application.

[0128] In a possible implementation manner, when the detection module 4203 controls the power path management module 4204 to output the first regulated voltage, the first diode conducts and the second diode cuts off; when the detection module 4203 controls the power path management module 4204 to output the second regulated voltage, the first diode cuts off and the second diode conducts.

[0129] In a possible embodiment of the present application, as Figure 11 shown, the power supply circuit further includes a main chip 450. The main chip 450 is connected to the display driving module 440, and the main chip 450 is used to send image information to the display driving module 440.

[0130] Among them, the main chip 450 is connected to the display driving module 440 through a video transmission protocol bus. The main chip 450 can transmit the image information to be displayed to the display driving module 440 through the video transmission protocol bus. For example, a display driving chip.

[0131] It should be noted that the main chip 450 also supports task calculation and management, graphics service processing, etc. For example, an advanced RISC machines (ARM) system on chip (SOC), a microprocessor without interlocked pipeline stages (MIPS) SOC, a central processing unit (CPU) SOC (such as an x86 SOC), etc.

[0132] In a possible embodiment of the present application, as Figure 11 shown, the second power supply module 430 includes a synchronous boost regulator 4301 and a synchronous buck-boost controller 4302. The input end of the synchronous boost regulator 4301 is connected to the output end of the power path management module 4204. The output end of the synchronous boost regulator 4301 is used to send a power supply voltage to the display driving module 440, and the synchronous buck-boost controller 4302 is used to receive the feedback voltage sent by the display driving module 440.

[0133] For example, the synchronous boost regulator 4301 receives the first regulated voltage Pa, boosts the first regulated voltage Pa, and outputs the supply voltage ELVDD. The display driving module 440 can adjust the voltage according to the image information transmitted by the main chip 450, and output the feedback voltage ELVSS to the synchronous buck-boost controller 4302.

[0134] Optionally, voltage regulation control of the supply voltage and the feedback voltage can also be performed between the second voltage module 430 and the display driving module 440.

[0135] In a possible embodiment of the present application, the main chip 450 is connected to the detection module 4203, and the detection module 4203 is used to detect the status information of the main chip 450, such as power consumption information, overclocking (turbo) information, etc.

[0136] For example, as Figure 11 shown, the detection module 4203 detects the main chip 450 through detection 6.

[0137] The embodiment of the present application also provides a power supply device, which includes the power supply circuit described in the above embodiment. The specific embodiment of the power supply circuit will not be described in detail here.

[0138] The embodiment of the present application also provides an electronic device, which includes a battery module, a display module, and the power supply circuit described in the above embodiment. The battery module is used to provide a power supply voltage for the power supply circuit, and the display module is used to display images.

[0139] In a possible embodiment of the present application, the display module includes a display driving module and an OLED display screen. The display driving module is used to drive the OLED display screen to display images.

[0140] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0141] Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments, and will not be described in detail here.

[0142] In several embodiments provided in the present 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 illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, 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 displayed or discussed coupling or direct coupling or communication connection between each other can be through some interfaces. The indirect coupling or communication connection of the devices or units can be in electrical, mechanical, or other forms.

[0143] As described above, this is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present application can easily think of changes or substitutions, which should all be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A power supply circuit, characterized in that, The power supply circuit includes: a first power supply module and a second power supply module; The input end of the first power supply module is used to receive a power supply voltage, which is provided by at least two strings of batteries. The output end of the first power supply module is connected to the input end of the second power supply module. The output end of the second power supply module is used to provide a power supply voltage for the display driving module, and the display driving module is used to drive the screen to display an image; The first power supply module is used to step down and convert the power supply voltage into a regulated voltage, and the second power supply module is used to step up and convert the regulated voltage into the power supply voltage, and the power supply voltage is used to drive the display driving module.

2. The power supply circuit according to claim 1, wherein The first power supply module includes a synchronous buck regulator module and / or a switched capacitor converter module.

3. The power supply circuit according to claim 2, characterized in that, When the first power supply module includes the synchronous buck regulator module and the switched capacitor converter module, the first power supply module further includes a detection module and a power path management module; The input end of the synchronous buck regulator module and the input end of the switched capacitor converter module are used to receive the power supply voltage. The output end of the synchronous buck regulator module is connected to the first input end of the power path management module. The output end of the switched capacitor converter module is connected to the second input end of the power path management module. The output end of the power path management module is connected to the input end of the second power supply module; The output end of the detection module is connected to the third input end of the power path management module. The detection module is used to control the power path management module to output the first regulated voltage output by the synchronous buck regulator module or the second regulated voltage output by the switched capacitor converter module.

4. The power supply circuit according to claim 3, wherein The detection module is used to detect the power efficiency set under different loads. The power efficiency set includes the power efficiency set of the first path and the power efficiency set of the second path. The first path is the path where the synchronous buck regulator module is located, and the second path is the path where the switched capacitor converter module is located; The detection module is used to detect the load information and the power supply voltage, and control the power path management module to output the first regulated voltage or the second regulated voltage according to the load information, the power supply voltage and the power efficiency set.

5. The power supply circuit according to claim 3, characterized in that, The detection module is used to detect the power efficiency of the first path and the power efficiency of the second path. When the power efficiency of the first path is greater than the power efficiency of the second path, the power path management module outputs the first regulated voltage; When the power efficiency of the second path is greater than the power efficiency of the first path, the power path management module outputs the second regulated voltage; When the power efficiency of the second path is equal to the power efficiency of the first path, the power path management module outputs the first regulated voltage or the second regulated voltage.

6. The power supply circuit according to any one of claims 2 to 5, characterized in that, The power path management module includes a first diode and a second diode; The first end of the first diode is connected to the output end of the synchronous buck regulator module, and the second end is connected to the second power supply module; The first end of the second diode is connected to the output end of the switched-capacitor converter module, and the second end is connected to the second power supply module.

7. The power supply circuit according to any one of claims 1 to 6, characterized in that, The power supply circuit further includes a main chip, which is connected to the display driving module. The main chip is configured to send image information to the display driving module, and the image information is used for displaying an image.

8. The power supply circuit according to any one of claims 1 to 7, characterized in that The second power supply module includes a synchronous boost regulator and a synchronous inverting boost controller; The input end of the synchronous boost regulator is connected to the output end of the power path management module. The output end of the synchronous boost regulator is configured to send a power supply voltage to the display driving module, and the synchronous inverting boost controller is configured to receive a feedback voltage sent by the display driving module.

9. An electronic device, characterized in that, The electronic device includes a battery module, a display module, and the power supply circuit according to any one of claims 1 to 8. The battery module is configured to provide a power supply voltage for the power supply circuit, and the display module is configured to display an image.

10. The electronic device according to claim 9, characterized in that, The display module includes a display driving module and a display screen. The display driving module is configured to drive the display screen to display an image.

Images