Power supply circuit and electronic device

Abstract

A power supply circuit and an electronic device, which relate to the field of display technology. The power supply circuit comprises a first power module (420) and a second power module (430). An input end of the first power module (420) is used for receiving a power voltage. An output end of the first power module (420) is connected to an input end of the second power module (430), and an output end of the second power module (430) is used for providing a power supply voltage to a display driving module (440). The display driving module (440) is used for driving a screen (450) to display images. When at least two battery strings provide a power voltage within a wide input voltage range, the first power module (420) is added to perform step-down conversion on the power voltage, and the second power module (430) then performs step-up conversion to generate a power supply voltage, which enables the display driving module (440) to drive the screen (450) to display images. The power supply circuit can realize low-voltage-tolerance power supply; a power voltage is first stepped down and then stepped up, so as to reach the minimum power supply voltage for the display driving module (440), such that a voltage supplied to the screen (450) also decreases under light-load conditions, thereby increasing output power, and thus improving power supply efficiency under the light-load conditions.

Description

Power supply circuit and electronic equipment

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on January 25, 2024, with application number 202410111295.3 and application name “A Power Supply Circuit and Electronic Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of display technology, and in particular to a power supply circuit and electronic equipment. Background Art

[0003] Organic light-emitting diodes (OLEDs) have become increasingly popular in recent years due to their inherent ability to emit light, requiring no backlight, color filters, or liquid crystals. They also offer advantages over traditional liquid crystal displays (LCDs) and light-emitting diodes (LEDs) in terms of image quality, response speed, thickness, and viewing angle.

[0004] With the development of display technology, OLED screens are widely used in mobile phones, digital cameras, laptops, televisions, etc. In electronic devices using OLED screens, the efficiency of the power supply used to drive the OLED screens varies depending on the load level of the electronic device, thereby affecting the battery life of the electronic device.

[0005] Summary of the Invention

[0006] The present application provides a power supply circuit and electronic device for improving the power efficiency of the power supply of OLED display technology when the display screen is under different loads, and selecting the optimal efficiency of the power supply.

[0007] The technical solution is as follows:

[0008] In a first aspect, an embodiment of the present application provides a power supply circuit, which includes: a first power supply module and a second power supply module.

[0009] The input end of the first power supply module is used to receive a power supply voltage 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 driver module, and the display driver module is used to drive the screen to display an image.

[0010] The first power supply module is used to step down the power supply voltage and convert it into a regulated voltage. The second power supply module is used to step up the regulated voltage and convert it into a supply voltage. The supply voltage is used to enable the display driver module to drive the OLED display screen.

[0011] In the present 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 a second power supply module to step down the power supply voltage and convert it into a regulated voltage. The second power supply module then steps up the regulated voltage and converts it into a supply voltage. The supply voltage is transmitted to the display driver module so that the display driver 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 requirement. The power supply voltage is first stepped down by the first power supply module and then stepped up by the second power supply module to meet the minimum supply voltage of the display driver module. When the screen is lightly loaded, the voltage is also reduced, which increases the output power, thereby improving the power efficiency under light load.

[0012] In one possible implementation of the present 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 configured to convert a power supply voltage into a first regulated voltage, and the switched capacitor converter module is configured to convert the power supply voltage into a second regulated voltage.

[0013] As an example, the first power supply module includes a synchronous buck regulator module to power the low-voltage OLED power supply solution. Through a two-stage power supply design, it solves the input voltage problem of the low-voltage OLED backlight power supply module and achieves improved power efficiency under light load.

[0014] As an example, the first power supply module includes a switching capacitor converter module, which supplies power to the low-voltage OLED power supply solution. Through a two-stage power supply design, it solves the input voltage problem of the low-voltage OLED backlight power supply module and achieves improved power efficiency under light load and partial heavy load.

[0015] In a possible implementation of the present 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, and 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.

[0016] In one possible implementation of the present application, a detection module is configured to detect a power efficiency set under different loads, where the power efficiency set includes a power efficiency set for a first path and a power efficiency set for a 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 configured to detect load information and power supply voltage, and, based on the load information, power supply voltage, and power efficiency set, control the power path management module to output a first regulated voltage or a second regulated voltage.

[0017] In an embodiment of the present application, a power efficiency set is obtained by detecting the power efficiency of different paths under different loads, such as a power efficiency table or a power efficiency curve, and then the load information and power supply voltage of different paths are measured. By comparing with the power efficiency set, a path with high efficiency can be selected.

[0018] 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 a 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 a 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 best efficiency can be selected.

[0019] In one possible implementation of the present application, a first end of the first diode is connected to the output of the synchronous buck regulator module, and a second end is connected to the second power module. A first end of the second diode is connected to the output of the switched capacitor converter module, and a second end is connected to the second power module. As an example, the first diode and the second diode may be ideal diodes.

[0020] In a possible implementation of the present application, the power supply circuit also includes a main chip, which is connected to the display driver module. The main chip is used to send image information to the display driver module, and the image information is used to display an image on the OLED screen.

[0021] In one possible implementation of the present application, the second power module includes a synchronous boost regulator and a synchronous inverting boost controller. The input of the synchronous boost regulator is connected to the output of the power path management module, the output of the synchronous boost regulator is used to send a supply voltage to the display driver module, and the synchronous inverting boost controller is used to receive a feedback voltage sent by the display driver module.

[0022] In a second aspect, an embodiment of the present application provides a power supply device, which includes the power supply circuit as described in the first aspect and any one of the first aspects.

[0023] In a third aspect, an embodiment of the present application provides a display device, which includes an OLED display screen and a power supply device as described in the second aspect.

[0024] In a fourth aspect, an embodiment of the present application provides an electronic device, comprising a battery module, a display module, and a power supply circuit as described in the first aspect and any one of the first aspects. The battery module is configured to provide a power supply voltage to the power supply circuit, and the display module is configured to display an image.

[0025] In one possible implementation of the present application, the display module includes: a display driver module and a display screen. The display driver module is used to drive the display screen to display an image. For example, the display screen can be an OLED display screen.

[0026] Any of the devices, computer storage media, computer program products, chips, or communication systems provided above 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 schemes in the corresponding methods provided above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG1 is a schematic diagram of a power supply circuit of a laptop computer with an OLED screen provided by the present application;

[0028] FIG2 is a schematic diagram of a power supply circuit with a wide input voltage range provided by the present application;

[0029] FIG3 is a schematic diagram of a power supply circuit with a narrow input voltage range provided by an embodiment of the present application;

[0030] FIG4 is a schematic structural diagram of a power supply circuit provided in an embodiment of the present application;

[0031] FIG5 is a schematic structural diagram of a power supply circuit having a synchronous buck regulator module provided in an embodiment of the present application;

[0032] FIG6 is a comparison diagram of power efficiency curves provided in an embodiment of the present application;

[0033] FIG7 is a schematic structural diagram of a power supply circuit having a switched capacitor converter module according to an embodiment of the present application;

[0034] FIG8 is another comparison diagram of power efficiency curves provided in an embodiment of the present application;

[0035] FIG9 is a schematic structural diagram of another power supply circuit provided in an embodiment of the present application;

[0036] FIG10 is a power efficiency curve diagram provided by an embodiment of the present application;

[0037] FIG11 is a schematic diagram of a circuit structure of a power supply circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] To facilitate a clear description of 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 between identical or similar items with substantially the same functions and effects. For example, the first power module and the second power module are merely used to distinguish between different power modules and do not limit their order. Those skilled in the art will understand that terms such as "first" and "second" do not limit the quantity or execution order, and that terms such as "first" and "second" do not necessarily indicate differences.

[0039] It should be noted that, in this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "exemplary" or "for example" should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0040] In this application, "at least one" means one or more, and "more" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple.

[0041] At present, organic light-emitting diode (OLED) technology is widely used in the field of display screens, such as laptop computers, televisions, mobile phones and other electronic devices. Taking a laptop computer as an example, as shown in Figure 1, Figure 1 shows a schematic diagram of a power supply circuit of a laptop computer with an OLED screen, including a battery 110 and a display driver module 120. The battery 110 is used to provide a driving voltage for the display driver module 120, and the display driver module 120 can drive the OLED screen 130 to display an image. However, the power efficiency of the 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, the input power of the power supply remains unchanged. When the laptop 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, thereby reducing the power efficiency, which has a greater impact on the battery life of the laptop computer.

[0042] To solve the power efficiency problem of the power supply circuit, two solutions are mainly adopted in the prior art: a wide input voltage range and a narrow input voltage range. The two power supply solutions are described below.

[0043] Solution 1: Wide input voltage range

[0044] FIG2 is a schematic diagram of a power supply circuit with a wide input voltage range provided by an embodiment of the present application, comprising a battery 210, a high-voltage OLED backlight power module 220, a display driver module 230, and an OLED screen 240. The battery 210 comprises two or more strings of battery cells. The battery 210 is used to provide a supply voltage to the high-voltage OLED backlight power module 220. The high-voltage OLED backlight power module 220 is used to convert the supply voltage into a drive voltage. The drive voltage is used to drive the display driver module 230. The display driver module 230 is used to drive the OLED screen 240 to display an image.

[0045] The high-voltage OLED backlight power module 220 includes a synchronous buck regulator 2201 and a synchronous inverting buck controller 2202. The input of the synchronous buck regulator 2201 is connected to the battery 210 for receiving the supply voltage, while the output of the synchronous buck regulator 2201 is connected to the display driver module 230 for outputting the drive voltage. The synchronous inverting buck controller 2202 is connected between the synchronous buck regulator 2201 and the display driver module 230 for voltage regulation.

[0046] The wide input voltage range solution is primarily used in large-sized OLED products, such as TVs and laptops. However, because battery 210 comprises at least two strings of cells, it has a relatively high input voltage. In this case, when the OLED product is highly loaded (high current), the power supply's output power is high due to both the high voltage and current, meaning the power supply efficiency is also high. However, when the load is low (low current), the high voltage and low current result in a low output power, meaning the power supply efficiency is also low.

[0047] Solution 2: Narrow input voltage range

[0048] FIG3 is a schematic diagram of a power supply circuit with a narrow input voltage range provided by an embodiment of the present application, comprising a battery 310, a low-voltage OLED backlight power module 320, a display driver module 330, and an OLED screen 340. The battery 310 comprises a string of battery cells. The battery 310 is used to provide a supply voltage to the low-voltage OLED backlight power module 320. The low-voltage OLED backlight power module 320 is used to convert the supply voltage into a drive voltage. The drive voltage is used to drive the display driver module 330. The display driver module 330 is used to drive the OLED screen 340 to display an image.

[0049] The low-voltage OLED backlight power module 320 includes a synchronous boost regulator 3201 and a synchronous inverting buck-boost controller 3202. The input of the synchronous boost regulator 3201 is connected to the battery 310 for receiving the supply voltage, while the output of the synchronous boost regulator 3201 is connected to the display driver module 330 for outputting the drive voltage. The synchronous inverting buck-boost controller 3202 is connected between the synchronous boost regulator 3201 and the display driver module 330 for voltage regulation.

[0050] Solutions with a narrow input voltage range are primarily used for small and medium-sized OLED products, such as mobile phones and tablets. Because the low-voltage OLED backlight power module 320 boosts and stabilizes the supply voltage, the power circuit efficiency remains relatively high regardless of whether the OLED product's load is high or low. However, the low-voltage OLED backlight power module 320 cannot directly connect to multiple strings of battery cells; it can only connect to a single string, making this solution's voltage tolerance insufficient. Furthermore, power efficiency decreases when the battery charge is low or when the power input voltage is low due to significant changes in the load of other modules in the OLED product.

[0051] As can be seen from the above, the current power supply circuit of OLED products has the problem of unstable power efficiency. When the load level is low or high, the power efficiency may be low, and the power supply circuit cannot select the optimal efficiency for power supply.

[0052] In order to solve the above problems, the present application proposes a power supply circuit and an electronic device, which improves the power efficiency under different load levels through a two-stage power supply solution, and judges and selects the optimal power supply method based on a single or multiple states by detecting the system or device status.

[0053] The following describes the OLED power supply circuit of a laptop computer, taking the OLED product as an example. As shown in Figure 4, Figure 4 is a schematic diagram of the structure of a power supply circuit provided in an embodiment of the present application. The power supply circuit includes: a first power supply module 420 and a second power supply module 430. The input end of the first power supply module 420 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 420 is connected to the input end of the second power supply module 430. The output end of the second power supply module 430 is used to provide a power supply voltage to the display driver module 440, which is used to drive the screen 450 to display an image.

[0054] The first power module 420 is used to step down the power voltage and convert it into a regulated voltage. The second power module 430 is used to step up the regulated voltage and convert it into a supply voltage. The supply voltage is used to drive the display driver module 440 .

[0055] In a possible implementation, the first power module 420 and the second power module 430 are integrated on a printed circuit board, or on a flexible circuit board, or other circuit boards, which is not limited in the embodiments of the present application.

[0056] In one possible embodiment, the power supply voltage is provided by a battery module 410 , as shown in FIG4 , and the output of the battery module 410 is connected to the input of the first power module 420 . The output of the second power module 430 is connected to the display driver module 440 .

[0057] The battery module 410 includes at least two battery strings, which are used to provide a power supply voltage with a wide input voltage range, and can also provide a power supply voltage of multiple levels, such as 12.9V, 11.4V, and 9.9V.

[0058] The first power module 420 can convert the power voltage into a regulated voltage, and the power voltage is stepped down by the first power module 420 and stabilized within a preset range.

[0059] As an example, as shown in FIG5 , the first power module 420 is a synchronous buck regulator module 4201. The output of the battery module 410 is connected to the input of the synchronous buck regulator module 4201, and the output of the synchronous buck regulator module 4201 is connected to the second power module 430. The synchronous buck regulator module 4201 is configured to convert the power supply voltage into a first regulated voltage. In this case, the synchronous buck regulator module 4201 functions as a DC synchronous buck regulated power supply to provide voltage to the second power module 430.

[0060] For example, the battery module 410 can provide three power supply voltage gears, 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 shown in Figure 6, a comparison chart of power efficiency curves is shown, in which the horizontal axis represents current and the vertical axis represents power efficiency. Curve 1 is a curve showing the change in power efficiency after adding the synchronous buck regulator module 4201, and curve 2 is the power efficiency curve of the above-mentioned scheme 1. It can be seen from the figure that when the current is low, that is, when the load is light, the power efficiency is significantly improved.

[0061] As another example, as shown in FIG7 , the first power module 420 is a switched capacitor converter module 4202. The output of the battery module 410 is connected to the input of the switched capacitor converter module 4202, and the output of the switched capacitor converter module 4202 is connected to the second power module 430. The switched capacitor converter module 4202 is configured to convert the power supply voltage into a second regulated voltage. In this case, the switched capacitor converter module 4202 acts as a DC switched capacitor conversion power supply to provide voltage to the second power module 430.

[0062] For example, 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 switched capacitor converter module 4202 is 3:1, and 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. FIG8 shows a comparison of power efficiency curves. Curves 1 to 3 show the power efficiency curves after adding switched capacitor converter module 4202, respectively for a high battery module charge (curve 1), a medium battery module charge (curve 2), and a low battery module charge (curve 3). Curve 4 shows the power efficiency curve for the aforementioned solution 1. As can be seen from the figure, the power efficiency is significantly improved when the current is low, i.e., when the load is light, and the power efficiency is also improved under partially heavy loads.

[0063] The supply voltage is a voltage generated by boosting the regulated voltage generated by the first power module 420 and stabilizing it within a preset range. For example, if the first power module 420 is a synchronous buck regulator module 4201, the synchronous buck regulator module 4201 converts the supply voltage into a first regulated voltage having a voltage value of 4.3V, and the second power module 430 converts the first regulated voltage into a supply voltage having a voltage value of 7V.

[0064] As an example, the second power module 430 is a synchronous boost regulator, the output end of the first power 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 .

[0065] In the present 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 step down the power supply voltage and convert it into a regulated voltage. The second power supply module 430 then steps up the regulated voltage and converts it into a supply voltage. The supply voltage is then transmitted to the display driver module 440, enabling the display driver module 440 to drive the OLED screen. Because the first power supply module 420 steps down the power supply voltage, the power supply circuit can meet the low withstand voltage power supply requirement. 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 to meet the minimum supply voltage of the display driver module. This reduces the voltage of the OLED when it is lightly loaded, increasing the output power and thus improving the power efficiency of the OLED screen when it is lightly loaded.

[0066] As shown in Figure 9, Figure 9 is a structural schematic diagram of a power supply circuit provided in 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 also includes: a detection module 4203 and a power path management module 4204.

[0067] The input of the synchronous buck regulator module 4201 and the input of the switched capacitor converter module 4202 are used to receive a power supply voltage. The output of the synchronous buck regulator module 4201 is connected to a first input of the power path management module 4204. The output of the switched capacitor converter module 4202 is connected to a second input of the power path management module 4204. The output of the power path management module 4204 is connected to an input of the second power supply module 430.

[0068] As an example, as shown in FIG9 , 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 .

[0069] 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 switching capacitor converter module 4202.

[0070] The first power supply module 420 may include only the synchronous buck regulator module 4201, only the switched capacitor converter module 4202, or both the synchronous buck regulator module 4201 and the switched capacitor converter module 4202. When the first power supply module 420 includes the synchronous buck regulator module 4201 and the switched capacitor converter module 4202, the synchronous buck regulator module 4201 outputs a first regulated voltage, and the switched capacitor converter module 4202 outputs a second regulated voltage.

[0071] In one possible embodiment of the present application, the detection module 4203 is configured to detect a power efficiency set under different loads, where the power efficiency set includes a power efficiency set of a first path and a power efficiency set of a second path. 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.

[0072] 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.

[0073] Among them, the detection module 4203 can calculate the power supply efficiency based on the input / output voltage and input / output current by detecting the input / output voltage and input / output current; it can also calculate the power supply efficiency by detecting the input / output efficiency; it can also calculate the input / output power by detecting the external resistance, and calculate the power supply efficiency based on the input / output power.

[0074] It is understandable that each load corresponds to a power efficiency, and multiple power efficiencies corresponding to multiple loads form a power efficiency set, such as a power efficiency curve.

[0075] For example, taking the case where the power supply voltage Pbat provided by the battery module 410 includes three gears of 12.9V, 11.4V, and 9.9V, the first regulated voltage Pa output by the synchronous buck regulator module 4201 is 4.3V, and the second regulated voltage Pb output by the switched capacitor converter module 4202 is 4.3V, 3.8V, and 3.3V. The power efficiency curve diagram shown in FIG10 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; and curve Eb3 is the efficiency curve when the power supply voltage Pbat is 9.9V.

[0076] The path can be understood as a channel through which the battery module 410 provides electrical energy to the display driving module 440 .

[0077] For example, as shown in Figure 9, the battery module 410 provides a power supply voltage Pbat, the synchronous buck regulator module 4201 outputs a first regulated voltage Pa, the switched capacitor converter module 4202 outputs a second regulated voltage Pb, the power path management module 4204 outputs an output voltage Po, and the second power module 430 outputs a supply voltage ELVDD. The first path is the power supply voltage Pbat, the first regulated voltage Pa, the output voltage Po, and the supply voltage ELVDD, while the second path is the power supply voltage Pbat, the second regulated voltage Pb, the output voltage Po, and the supply voltage ELVDD.

[0078] Optionally, the first regulated voltage output by the synchronous buck regulator module 4201 may be transmitted directly to the second power supply module 430 without passing through the power path management module 4204. For example, the first regulated voltage output by the synchronous buck regulator module 4201 at point X in FIG9 bypasses the power path management module 4204 to reach point Y. Similarly, the second regulated voltage output by the switched capacitor converter module 4202 may be transmitted directly to the second power supply module 430 without passing through the power path management module 4204. For example, the first regulated voltage output by the switched capacitor converter module 4202 at point M in FIG9 bypasses the power path management module 4204 to reach point N.

[0079] Optionally, the detection module 4203 is further configured to store a set of power efficiency values ​​under different loads. The set of power efficiency values ​​under different loads can be stored in the detection module 4203 in the form of a table, a graph, or other forms, which are not limited in the embodiments of the present application.

[0080] The detection module 4203 is used to detect load information and 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, power supply voltage and power efficiency set.

[0081] The detection module 4203 may be a micro-controller unit (MCU). For example, the MCU may be used to store a power efficiency graph and a power efficiency table.

[0082] The load information is a load point (e.g., 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 obtained by detecting the second power module 430 through the detection module 4203, or by detecting the display driver module 440.

[0083] In one possible implementation of the present application, the detection module 4203 stores a power efficiency curve. 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 driver module 440. Referring to FIG9 , the step of the detection module 4203 controlling the power path management module 4204 to output the first regulated voltage or the second regulated voltage includes:

[0084] Step S101: The detection module 4203 obtains load information.

[0085] 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.

[0086] 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 embodiment of the present application.

[0087] As another example, the detection module 4203 obtains the power load point x1 from the second power module 430 through detection 5.

[0088] Step S102 : The detection module 4203 detects the first regulated voltage and the second regulated voltage.

[0089] The first regulated voltage and the second regulated voltage can be obtained by detecting the power supply voltage Pbat, or can be obtained directly.

[0090] As an example, the detection module 4203 obtains the power supply voltage Pbat through detection 1, and then converts the power supply voltage Pbat to obtain the first regulated voltage and the second regulated voltage.

[0091] For example, the detection module 4203 obtains a power supply voltage Pbat of 12.9V through detection 1, then it can be determined that the first regulated voltage Pa is 4.3V and the second regulated voltage Pb is 4.3V; the detection module 4203 obtains a power supply voltage Pbat of 11.4V through detection 1, then it can be determined that the first regulated voltage Pa is 4.3V and the second regulated voltage Pb is 3.8V; the detection module 4203 obtains a power supply voltage Pbat of 9.9V through detection 1, then it can be determined that the first regulated voltage Pa is 4.3V and the second regulated voltage Pb is 3.3V.

[0092] 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.

[0093] In step S103 , the detection module 4203 determines a first efficiency point according to the first regulated voltage Pa and the power efficiency curve, and determines a second efficiency point according to the second regulated voltage Pa and the power efficiency curve.

[0094] 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 reducing the power supply voltage Pbat from 11.4V. Combined with the power efficiency curve shown in Figure 10 (the meaning of each curve in Figure 10 refers to the above embodiment), it can be determined that the curve Ea2 is the corresponding power 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. Combined with the power efficiency curve shown in Figure 10, it can be determined that the curve Eb2 is the corresponding power efficiency curve. According to the load point x1, the second efficiency point Eb2-x1 can be determined.

[0095] For example, the load information obtained by the detection module 4023 is the power load point x2. Similar to the above embodiment, combined with the power efficiency curve shown in FIG8 , the first efficiency point Ea2-x2 and the second efficiency point Eb2-x2 can be determined.

[0096] Step S104 : The detection module 4203 compares the first efficiency point with the second efficiency point, and controls the regulated voltage output by the power path management module 4204 according to the first efficiency point and the second efficiency point.

[0097] Among them, 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.

[0098] For example, according to the above step S103, it can be seen from Figure 10 that when the load information is 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.

[0099] For example, according to the above step S103, it can be seen from Figure 10 that when the load information is 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.

[0100] It is worth noting that the first efficiency point and the second efficiency point may also be the same. In this case, 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 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.

[0101] In one possible embodiment of the present application, the detection module 4203 is configured to detect the power efficiency of the first path and the power efficiency of the second path. If the power efficiency of the first path is greater than the power efficiency of the second path, the power path management module 4204 outputs a first regulated voltage. If the power efficiency of the second path is greater than the power efficiency of the first path, the power path management module 4204 outputs a second regulated voltage. If the power efficiency of the second path is equal to the power efficiency of the first path, the power path management module 4204 outputs either the first regulated voltage or the second regulated voltage.

[0102] 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, and 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, and is determined by the efficiency of the switched capacitor converter module 4202 and the efficiency of the second power module 430.

[0103] Among them, the efficiency of the synchronous buck regulator module 4201 can be obtained by directly detecting the synchronous buck regulator module 4201 through the detection module 4203, the efficiency of the switching capacitor converter module 4202 can be obtained by directly detecting the switching capacitor converter module 4202 through the detection module 4203, and the efficiency of the second power supply module 430 can be obtained by directly detecting the second power supply module 430.

[0104] In one possible implementation of the present application, referring to FIG9 , 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 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:

[0105] In 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 .

[0106] For example, the detection module 4203 obtains the efficiency E1 from the synchronous buck regulator module 4201 through detection 2. The detection module 4203 obtains the efficiency E1′ from the second power supply module 430 through detection 5.

[0107] In 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 .

[0108] For example, the detection module 4203 obtains the efficiency E2 from the switched capacitor converter module 4202 through detection 3. The detection module 4203 obtains the efficiency E2′ from the second power supply module 430 through detection 5.

[0109] In 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 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 module 430 .

[0110] Among them, the power supply efficiency can be the product of the efficiencies. For example, the first power supply efficiency is the product of the efficiency of the synchronous buck regulator module 4201 and the efficiency of the second power supply module 430. It can also be other relationships, which are not limited in the embodiments of the present application.

[0111] For example, the detection module 4203 determines that the first power supply efficiency is E1*E1' based on 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' based on the efficiency E2 of the switching capacitor converter module 4202 and the efficiency E2' of the second power supply module 430.

[0112] Step S204 : The detection module 4203 compares the first power efficiency and the second power efficiency, and controls the regulated voltage output by the power path management module 4204 according to the first power efficiency and the second power efficiency.

[0113] 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 first regulated voltage or the second regulated voltage output by the power path management module 4204.

[0114] As another example, the power 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 module 430. The power 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 module 430.

[0115] The input power and the output power can be measured using the formula P=U*I.

[0116] For example, if a series resistor R is added to the power input terminal of the synchronous buck regulator module 4021, the input voltage is Va, and the output voltage 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 module 430 are similar and will not be further described here.

[0117] In one possible implementation of the present application, referring to FIG9 , 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 steps S201 to S204 described in the above embodiment is that the detection module 4203 obtains the power efficiency by detecting the input / output power. The specific steps include:

[0118] In 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 .

[0119] 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.

[0120] In 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 .

[0121] 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.

[0122] In step S303 , the detection module 4203 determines the first power efficiency according to the input power of the synchronous buck regulator module 4201 and the output power of the second power module 430 , and determines the second power efficiency according to the input power of the switched capacitor converter module 4202 and the output power of the second power module 430 .

[0123] The power efficiency is the ratio of output power to input power. For example, the first power efficiency is the ratio of the output power of the second power module 430 to the input power of the synchronous buck regulator module 4201 .

[0124] For example, the detection module 4203 determines that the first power efficiency is P1' / P1 based on the input power P1 of the synchronous buck regulator module 4201 and the output power P1' of the second power module 430, and determines that the second power efficiency is P2' / P2 based on the input power P2 of the switching capacitor converter module 4202 and the output power P2' of the second power module 430.

[0125] Step S304 : The detection module 4203 compares the first power efficiency and the second power efficiency, and controls the regulated voltage output by the power path management module 4204 according to the first power efficiency and the second power efficiency.

[0126] The specific implementation is as described in the above embodiment and will not be repeated here.

[0127] In one possible embodiment of the present application, as shown in FIG9 , 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 of the synchronous buck regulator module 4201, and the second end is connected to the second power module 430. The first end of the second diode is connected to the output of the switched capacitor converter module 4202, and the second end is connected to the second power module 430.

[0128] The first diode and the second diode are both ideal diodes. For example, referring to FIG11 , the first diode is an ideal diode a, and the second diode is an ideal diode b.

[0129] It is worth noting that the power path management module 4204 may also contain other electronic components that control the circuit to be turned on or off, which is not limited in the embodiment of the present application.

[0130] In one possible implementation, when the detection module 4203 controls the power path management module 4204 to output a first regulated voltage, the first diode is turned on and the second diode is turned off; when the detection module 4203 controls the power path management module 4204 to output a second regulated voltage, the first diode is turned off and the second diode is turned on.

[0131] In a possible embodiment of the present application, as shown in FIG11 , the power supply circuit further includes a main chip 450 . The main chip 450 is connected to the display driver module 440 . The main chip 450 is configured to send image information to the display driver module 440 .

[0132] The main chip 450 is connected to the display driver module 440 via a video transmission protocol bus. The main chip 450 can transmit image information to be displayed to the display driver module 440, such as a display driver chip, via the video transmission protocol bus.

[0133] It is worth noting that the main chip 450 also supports task calculation and management, graphics business processing, etc., such as advanced reduced instruction set processor (ARM) system on chip (SOC), microprocessor instruction set architecture (MIPS) SOC, central processing unit (CPU) SOC (such as x86 SOC), etc.

[0134] In one possible embodiment of the present application, as shown in FIG11 , the second power supply module 430 includes a synchronous boost regulator 4301 and a synchronous inverting 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 supply voltage to the display driver module 440. The synchronous inverting buck-boost controller 4302 is used to receive a feedback voltage sent by the display driver module 440.

[0135] For example, the synchronous boost regulator 4301 receives the first regulated voltage Pa and boosts it to output the supply voltage ELVDD. The display driver module 440 can adjust the voltage based on the image information transmitted by the main chip 450 and output the feedback voltage ELVSS to the synchronous inverting buck-boost controller 4302.

[0136] Optionally, voltage regulation control of the supply voltage and the feedback voltage may be performed between the second voltage module 430 and the display driver module 440 .

[0137] 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 status information of the main chip 450, such as power consumption information, overclocking (turbo) information, etc.

[0138] For example, as shown in FIG11 , the detection module 4203 detects the main chip 450 through detection 6 .

[0139] An embodiment of the present application further provides a power supply device, which includes the power supply circuit described in the above embodiment. The specific embodiment of the power supply circuit is not repeated here.

[0140] The present application also provides an electronic device including a battery module, a display module, and a power supply circuit as described in the above embodiment. The battery module is used to provide a power supply voltage to the power supply circuit, and the display module is used to display an image.

[0141] In a possible embodiment of the present application, the display module includes a display driver module and an OLED display screen. The display driver module is used to drive the OLED display screen to display an image.

[0142] 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.

[0143] 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.

[0144] 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.

[0145] 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 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, wherein 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 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 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, and the output end of the synchronous boost regulator is configured to send a power supply voltage to the display driving module. The synchronous inverting boost controller is configured to receive the 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 a power supply circuit as claimed in 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, and the display driving module is configured to drive the display screen to display an image.

Images