Charging protection method, device, mainboard and display

Abstract

The present invention discloses a charging protection method, device, mainboard and display. The method monitors the output current of a charging interface during charging of a load. If the output current exceeds a preset overcurrent protection threshold, the duration of the overcurrent protection threshold is accumulated. If the duration is greater than or equal to a preset delay time, a power management chip is controlled to shut down charging of the load. If the duration is less than the preset delay time, normal charging is maintained. The method can reduce false triggering of charging overcurrent protection in response to a situation where the load is momentarily overloaded.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a charging protection method, device, mainboard and display. Background Art

[0002] With the development of electronic technology, monitors are widely used in various industries and scenarios, and their functions are becoming more and more abundant. With the rise of type-C products, more and more monitors are also equipped with type-C ports, which can be used for external charging. Overcurrent protection is an important issue for type-C external charging. The traditional overcurrent protection method is through the hardware protection of PMIC (Power Management IC) itself. This method is relatively rigid and has poor controllability, which is not conducive to ensuring the stability of the charging process. Summary of the invention

[0003] In view of the above problems, the present invention is proposed to provide a charging protection method, device, mainboard and display that overcome the above problems or at least partially solve the above problems.

[0004] In a first aspect, a charging protection method is provided, the method comprising:

[0005] During the process of charging the load, monitor the output current of the charging interface;

[0006] If the output current exceeds a preset overcurrent protection threshold, the duration of exceeding the overcurrent protection threshold is accumulated;

[0007] If the duration is greater than or equal to the preset delay time, the power management chip is controlled to shut down charging of the load; if it is less than the preset delay time, normal charging is maintained.

[0008] Optionally, before charging the load, it also includes:

[0009] Obtaining a charging current supported by the load;

[0010] Based on the charging current, an overcurrent protection threshold corresponding to the load is configured, wherein the overcurrent protection threshold is less than a maximum protection current value set inside a power management chip.

[0011] Optionally, configuring the overcurrent protection threshold corresponding to the load based on the charging current includes:

[0012] Determining a gain value based on the product of the charging current and a preset gain coefficient;

[0013] The sum of the charging current and the gain value is used as the overcurrent protection threshold corresponding to the load.

[0014] Optionally, the above-mentioned monitoring of the output current of the charging interface includes:

[0015] The output current of the power line of the charging interface is collected by a current detection chip.

[0016] Optionally, the controlling the power management chip to shut down charging of the load includes:

[0017] A shutdown instruction is sent to the power management chip so that the power management chip shuts down charging of the load.

[0018] In a second aspect, a charging protection device is provided, the device comprising:

[0019] A monitoring module, used to monitor the output current of the charging interface during the process of charging the load;

[0020] A time accumulation module, used for accumulating the duration of exceeding the preset overcurrent protection threshold if the output current exceeds the overcurrent protection threshold;

[0021] The control module is used to control the power management chip to shut down charging of the load if the duration is greater than or equal to the preset delay time, and to maintain normal charging if the duration is less than the preset delay time.

[0022] In a third aspect, a display mainboard is provided, comprising a power management chip, a charging controller and a charging interface for connecting a load, wherein the charging controller is connected to the power management chip and the charging interface, respectively, and the charging controller is used to control the power management chip to charge the load and execute the steps of the charging protection method described in the first aspect above.

[0023] Optionally, the above-mentioned display mainboard also includes a current detection chip, the input end of the current detection chip is connected to the power line of the charging interface, and is used to collect the output current of the power line of the charging interface, and the output end of the current detection chip is connected to the charging controller.

[0024] Optionally, the power management chip is used to output a charging voltage to charge the load, and when it is detected that the output charging current is greater than a preset maximum protection current value, shut down the charging of the load, wherein the maximum protection current value is greater than the overcurrent protection threshold set in the charging controller.

[0025] Optionally, the above charging interface is a type-C interface.

[0026] In a fourth aspect, a display is provided, comprising the display mainboard described in the third aspect.

[0027] In a fifth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions. When the computer instructions are executed on a computer, the computer executes the steps of the charging protection method provided in the first aspect above.

[0028] The technical solution provided in the embodiments of the present invention has at least the following technical effects or advantages:

[0029] The charging protection method, device, mainboard and display provided by the embodiments of the present invention monitor the output current of the charging interface during the process of charging the load; if the output current exceeds the preset overcurrent protection threshold, the duration of exceeding the overcurrent protection threshold is accumulated; if the duration is greater than or equal to the preset delay time, the power management chip is controlled to shut down the charging of the load; if it is less than the preset delay time, normal charging is maintained, thereby avoiding triggering the charging protection when the load is momentarily overloaded but the duration is very short and will not cause damage to the display and the load. It can reduce the false triggering of the charging overcurrent protection in the case of instantaneous overload of the load, which is beneficial to improving the stability of the charging process while achieving overcurrent protection.

[0030] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0032] Figure 1 This is a flow chart of a charging protection method according to an embodiment of the present invention;

[0033] Figure 2 is a schematic structural diagram of an exemplary charging circuit in an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of an output current fluctuation in an embodiment of the present invention;

[0035] Figure 4 This is another schematic diagram of output current fluctuation in an embodiment of the present invention;

[0036] Figure 5 This is a module block diagram of a charging protection device in an embodiment of the present invention;

[0037] Figure 6 This is a structural example diagram of a display mainboard according to an embodiment of the present invention;

[0038] Figure 7 The figure is a structural example diagram of a display in an embodiment of the present invention. DETAILED DESCRIPTION

[0039] In addition to the conventional HDMI (High Definition Multimedia Interface) and DP (DisplayPort) interfaces, the monitor can also be equipped with a type-C interface, which can charge loads such as mobile phones, laptops and other mobile terminals through the type-C interface. For example, the power of the type-C port in the monitor can reach 100W. At the same time, overcurrent protection (OCP) has become an important issue for type-C external charging of the monitor. Traditional overcurrent protection methods are implemented by hardware protection circuits set inside the PMIC (Power Management IC), that is, the PMIC itself sets a current threshold. When the load current reaches the threshold, it will immediately protect and stop charging.

[0040] However, after long-term practical research, the inventors found that in some charging scenarios, although the load is overloaded for a moment, the duration is very short and will not cause damage to the display and the load. In the case of instantaneous overload, the above-mentioned traditional overcurrent protection method will easily lead to false triggering of charging protection. Based on this, the embodiments of the present invention provide a charging protection method, device, mainboard and display, which can reduce the false triggering of charging overcurrent protection in the case of instantaneous overload of the load, which is beneficial to improve the stability of the charging process while achieving overcurrent protection.

[0041] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0042] First, Figure 1 A flow chart of a charging protection method provided by an embodiment of the present invention is shown. Figure 1 As shown, the charging protection method may include the following steps:

[0043] Step S101, during the process of charging the load, monitoring the output current of the charging interface;

[0044] Step S102, if the output current exceeds the preset over-current protection threshold, the duration of exceeding the over-current protection threshold is accumulated;

[0045] Step S103, if the duration is greater than or equal to the preset delay time, the power management chip is controlled to turn off charging of the load; if it is less than the preset delay time, normal charging is maintained.

[0046] For example, the main board of the display may include a power management chip PMIC, a charging controller (PDController) and a charging interface. Among them, the PMIC is connected to the charging controller and the charging interface respectively, and the charging controller is connected to the charging interface. Of course, in addition to the above components, the display main board also includes other components, such as Scaler chip, HDMI interface, DP interface and other existing components, which are not described in detail here. The charging protection method provided in an embodiment of the present invention can be applied to the above-mentioned charging controller. By adding the charging protection function described in steps S101 to S103 in the charging controller, the overcurrent protection of the display during external charging is realized at the software level.

[0047] It should be noted that the specific chip models used by the PMIC and the charging controller can be determined according to the actual application scenario, and the charging interface can be an interface type applicable to the charging protection method provided in the embodiment of this specification, and this embodiment does not limit this. For example, in an application scenario, the PMIC can use the SY8665TTC chip, the charging controller can use the VL103R chip, and the charging interface can be a type-C interface. The embodiment of this specification mainly uses the type-C interface as an example for explanation.

[0048] In specific implementation, the display charging interface has multiple voltage and current gears for external charging, and the specific charging gear used can be determined according to the charging requirements of the external load. For example, when the type-C interface charges 100W externally, there are generally 5 gears of voltage and current: 5V / 3A, 9V / 3A, 12V / 3A, 15V / 3A and 20V / 5A. At this time, for the two different current outputs of 3A and 5A, the hardware protection circuit solution set inside the traditional PMIC, the protection current value set inside the PMIC is fixed, and in order to avoid the load from instantaneously drawing too much and triggering overcurrent protection, the protection current value can only be set larger based on the large current of 5A, such as 8A. In this way, for loads that support 3A charging, a better overcurrent protection effect cannot be obtained.

[0049] In this regard, in order to obtain a better overcurrent protection effect, in an optional implementation, the overcurrent protection threshold can be set in the charging controller through software before charging the load to achieve dynamic adjustment of the overcurrent protection threshold. At this time, the above-mentioned charging protection method may also include: an overcurrent protection threshold configuration step. After the charging controller identifies the voltage and current requirements of the load charging through the charging interface, before charging the load, the overcurrent protection threshold configuration step is executed to configure the overcurrent protection threshold of this charging process. Specifically, the overcurrent protection threshold configuration step may include: obtaining the charging current supported by the load; based on the charging current, configuring the overcurrent protection threshold corresponding to the load. In this way, different overcurrent protection thresholds can be set for loads with different charging currents, and dynamic adjustment of the overcurrent protection threshold can be achieved, so that the set overcurrent protection threshold is adapted to the load, which is conducive to achieving a better overcurrent protection effect.

[0050] It should be noted that the overcurrent protection threshold set by software should be less than the maximum protection current value set in the overcurrent protection circuit inside the PMIC. The maximum protection current value is the maximum charging current that the display and the load can withstand. When the VBUS current exceeds this current, the display and the load are easily damaged. It can be set according to the current output value that the charging interface can support in the actual application scenario. For example, in the case where the PMIC has two different current outputs of 3A and 5A, the maximum protection current value set inside the PMIC can be 8A. At this time, the overcurrent protection threshold configured in the charging controller should be less than 8A.

[0051] For example, when a load to be charged, such as a mobile phone or a laptop computer, is connected to the type-C interface of the display through a type-C signal line (such as Gen2, PD3.0, built-in E-marker IC, and supports 5A charging), the CC pin of the type-C interface establishes a communication connection with the load. The charging controller can identify the charging voltage and charging current supported by the load and send them to the PMIC, which outputs the corresponding voltage and current to the power line (VBUS) of the type-C interface to charge the load. In this process, after the charging controller can identify the charging current supported by the load, it can execute the above-mentioned overcurrent protection threshold configuration step to set the overcurrent protection threshold so that overcurrent protection can be performed based on the overcurrent protection threshold during the charging process.

[0052] In an optional embodiment, the process of configuring the overcurrent protection threshold corresponding to the load based on the charging current may include: determining the gain value based on the product of the charging current and the preset gain coefficient; and using the sum of the charging current and the gain value as the overcurrent protection threshold corresponding to the load. The preset gain coefficient can be set based on actual experience, for example, it can be set between 10% and 20%. For example, if the charging current of the load is 5A, if the preset gain coefficient is 10%, the gain value is 0.5A, and the overcurrent protection threshold is 5.5A; if the preset gain coefficient is 20%, the gain value is 1A, and the overcurrent protection threshold is 6A.

[0053] Of course, in other embodiments of this specification, other configuration methods may also be used. For example, a fixed gain value may be pre-set, and after obtaining the charging current of the load, the sum of the charging current and the gain value is used as the overcurrent protection threshold. For example, the gain value may be set to 1A. When the current charging current is 3A, the overcurrent protection threshold set by software in the charging controller is 4A. When the current charging current is 5A, the overcurrent protection threshold set by software in the charging controller is 6A.

[0054] After the charging controller completes the configuration of the overcurrent protection threshold for this charging, the charging of the load can be started. It can be understood that in order to achieve overcurrent protection, it is necessary to perform the above step S101 to monitor the charging output current of the PMIC chip.

[0055] In an optional implementation, in order to facilitate the charging controller to obtain the charging output current of the PMIC, a current detection chip can be pre-installed in the display motherboard. The input end of the current detection chip is connected to the VBUS of the type-C interface, and the output end is connected to the charging controller. It is used to monitor the current value on the VBUS of the type-C interface in real time and feed it back to the charging controller. In this way, in the above step S101, the output current on the power line of the charging interface can be collected by the current detection chip to achieve overcurrent protection from step S102 to step S103. For example, the current detection chip can use the INA233 chip, which can be used to monitor voltage, current and power.

[0056] Of course, in some application scenarios, if the hardware can support it, the charging controller can also read the charging output current from the PMIC.

[0057] After the charging controller obtains the output current of the charging interface, it detects in real time whether the output current exceeds the overcurrent protection threshold value preset in the charging controller. If it is detected that the output current exceeds the overcurrent protection threshold value, the above step S102 is executed, and the timing starts from the moment when the output current is detected to exceed the overcurrent protection threshold value, until the collected output current does not exceed the overcurrent protection threshold value, the duration of this output current exceeding the overcurrent protection threshold value is accumulated, and the above step S103 is executed.

[0058] In the above step S103, the accumulated duration is compared with the preset delay time. If the duration is greater than or equal to the preset delay time, it means that the duration of the overload of the load is relatively long, which is easy to cause damage to the display and the load. At this time, it is necessary to trigger the overcurrent protection and shut down the charging. For example, the charging controller can send a shutdown instruction to the PMIC to make the PMIC shut down the charging of the load.

[0059] If the duration is less than the preset delay time, it means that although the load is momentarily overloaded, the duration is relatively short. For example, the ripple phenomenon caused by voltage instability causes the output current to increase momentarily, which will not cause damage to the display and the load. There is no need to trigger the overcurrent protection, and the PMIC can maintain normal charging.

[0060] During specific implementation, the preset delay time can be set according to the usage experience of the actual application scenario, for example, it can be set to 100ms or 200ms.

[0061] In this way, the false triggering of overcurrent protection can be effectively reduced for the situation where the load is instantly overloaded, which is beneficial to improving the stability of the charging process while achieving overcurrent protection.

[0062] In an optional implementation, the current detection chip and the charging controller, the charging controller and the PMIC, and the PMIC and the type-C interface can communicate through the IIC (Inter-Integrated Circuit) bus, and the same IIC channel can be used to facilitate data transmission. The IIC bus is a serial communication bus that uses a multi-master-slave architecture, which is simple to implement and easy to use. Among them, the charging controller serves as the master, and the current detection chip and PMIC serve as slaves. Of course, in other embodiments of the present invention, other communication methods can also be used between the above-mentioned devices. For example, the PMBus (Power Management Bus) communication method can be used, and this embodiment does not limit this.

[0063] For ease of understanding, take the PMIC using the SY8665TTC chip as an example. Figure 2A schematic diagram of the structure of an exemplary charging circuit in a display mainboard is shown. Figure 2 The VBUS pin of PMIC201 is connected to the VBUS pin of type-C interface 204 through PMOS tube and resistor R, and a pull-down capacitor C is provided between resistor R and the VBUS port of type-C interface 204. Among them, the PMOS tube is used to prevent current backflow. The current detection chip 203 is connected to both ends of the resistor R, and the current value on the VBUS of the type-C interface is obtained by detecting the current on the resistor R. The output end of the current detection chip 203 is connected to the charging controller 202 through the IIC bus, and the charging controller 202 is connected to the SCL, SDA and INT pins of PMIC201 through the IIC bus. Among them, the VBUS pin of PMIC201 is used to output charging voltage and current to the type-C interface 204, the SCL pin of PMIC201 is a serial clock line, the SDA pin is a serial data line, and the INT pin is an external interrupt, which is used to realize communication between PMIC201 and the charging controller 202.

[0064] It should be noted that Figure 2 Other peripheral circuits and other pins of PMIC201 are not shown. The specific chip pins and peripheral circuits can be determined according to the chip model used in the actual application scenario, which will not be described in detail in this embodiment.

[0065] In specific implementation, after the charging cable of the load is inserted into the type-C interface 204, a communication connection can be established between them. The charging controller 202 provides the charging voltage and current level that can be provided to the load on the one hand, and obtains the charging level supported by the load on the other hand, and then feeds back the charging level supported by the load to the PMIC201, and configures the overcurrent protection threshold based on the charging current supported by the load. After receiving the charging level supported by the load, the PMIC201 outputs the voltage and current of the corresponding level through the VBUS pin to charge the load.

[0066] During the charging process, the charging controller 202 obtains the current value fed back by the current detection chip 203 in real time. If the output current exceeds the preset overcurrent protection threshold, the duration of exceeding the overcurrent protection threshold is accumulated. If the duration is greater than or equal to the preset delay time, a shutdown instruction is sent to PMIC201 to instruct PMIC201 to shut down the type-C charging of the load. If it is less than the preset delay time, normal charging is maintained. In this way, the overcurrent protection of the charging process is realized by software in the charging controller 202, which has strong controllability and is conducive to reducing the false triggering of the overcurrent protection.

[0067] For example, Figure 3 A schematic diagram of output current fluctuation is shown in FIG. Figure 3As shown, assuming that the maximum charging current Imax supported by the load is 3A, the overcurrent protection threshold I set in the charging controller 202 p1 When VBUS is turned on to charge the load, the VBUS current I vbus When the current increases to more than 4A, the accumulated VBUS current in the charging controller 202 exceeds the duration T of 4A. If t1 is greater than or equal to the preset delay time, the PMIC 201 is instructed to turn off the output of the VBUS pin, that is, to turn off the charging of the load.

[0068] In addition, in order to achieve a better protection effect, the overcurrent protection method set by the charging controller 202 software can be used in combination with the overcurrent protection circuit set by the internal hardware of PMIC201. That is to say, during the charging process, in addition to the charging controller 202 executing the above steps S101 to S103 to achieve overcurrent protection, PMIC201 will also detect in real time whether the output current of the VBUS pin is greater than the preset maximum current protection value. When it is detected that the output charging current is greater than the maximum current protection value, the overcurrent protection inside PMIC201 is triggered to turn off the charging of the load. Among them, the maximum current protection value is greater than the overcurrent protection threshold set in the charging controller 202.

[0069] For example, Figure 4 Another schematic diagram of output current fluctuation is shown in FIG. Figure 4 As shown, assuming that the maximum charging current Imax supported by the load is 3A, the overcurrent protection threshold I set in the charging controller 202 p1 The maximum current protection value I set inside PMIC201 is 4A. p2 When VBUS is turned on to charge the load, the VBUS current I vbus When the VBUS current increases to more than 4A, the duration T of the accumulated VBUS current in the charging controller 202 exceeding 4A, if t2 is less than the preset delay time, the VBUS output is normal. Then, when the VBUS current increases to more than 8A, the PMIC 201 will immediately enter the overcurrent protection state, turn off the output of the VBUS pin, and stop charging.

[0070] In the second aspect, based on the same inventive concept, the embodiment of the present invention further provides a charging protection device, which runs in the above-mentioned charging controller 202. Figure 5 As shown, the charging protection device 50 includes:

[0071] The monitoring module 501 is used to monitor the output current of the charging interface during the process of charging the load;

[0072] A time accumulation module 502, for accumulating a duration of exceeding a preset over-current protection threshold value if the output current exceeds the over-current protection threshold value;

[0073] The control module 503 is used to control the power management chip to shut down charging of the load if the duration is greater than or equal to the preset delay time, and to maintain normal charging if the duration is less than the preset delay time.

[0074] In an optional embodiment, the above-mentioned charging protection device 50 also includes: a configuration module, used to: obtain the charging current supported by the load; based on the charging current, configure the overcurrent protection threshold corresponding to the load, wherein the overcurrent protection threshold is less than the maximum protection current value set inside the power management chip.

[0075] In an optional implementation, the configuration module is used to: determine a gain value based on the product of the charging current and a preset gain coefficient; and use the sum of the charging current and the gain value as an overcurrent protection threshold corresponding to the load.

[0076] In an optional implementation, the monitoring module 501 is used to collect the output current on the power line of the charging interface through a current detection chip.

[0077] In an optional implementation, the control module 503 is used to send a shutdown instruction to the power management chip, so that the power management chip shuts down charging the load.

[0078] It should be noted that the above modules can be implemented by software codes, and the specific process of the above modules implementing their respective functions can be found in the specific content described in the above method embodiment, which will not be repeated here.

[0079] In a third aspect, based on the same inventive concept, an embodiment of the present invention further provides a display motherboard. Figure 6 As shown, the display motherboard 60 includes: a power management chip 601, a charging controller 602 and a charging interface 603 for connecting a load, and the charging controller 602 is respectively connected to the power management chip 601 and the charging interface 603. Of course, in addition to the above components, the display motherboard 60 also includes other components, such as a Scaler chip, an HDMI interface, a DP interface and other existing components, which will not be described in detail here.

[0080] The charging controller 602 is used to control the power management chip 601 to charge the load and execute the steps of the charging protection method provided in the above method embodiment. For the specific implementation process of the charging protection method, please refer to the specific content described in the above method embodiment, which will not be repeated here.

[0081] The charging interface 603 may be a type-C interface, or may be other interfaces applicable to the charging protection method provided in the above method embodiment.

[0082] In an optional embodiment, the above-mentioned display main board 60 also includes a current detection chip 604, the input end of the current detection chip 604 is connected to the power line of the charging interface 603, and is used to collect the output current of the power line of the charging interface 603, and the output end of the current detection chip 604 is connected to the charging controller 602.

[0083] In an optional embodiment, the power management chip 601 is used to output a charging voltage to charge the load, and when it is detected that the output charging current is greater than a set value, the charging of the load is turned off, wherein the set value is greater than the overcurrent protection threshold set in the charging controller 602.

[0084] In a fourth aspect, based on the same inventive concept, an embodiment of the present invention further provides a display. Figure 7 As shown, the display 70 includes the display mainboard 701 provided in the third aspect. The specific structure of the display mainboard 701 can be found in the specific content described in the third aspect, which will not be repeated here. Of course, in addition to the mainboard, the display 70 may also include other components, such as a display panel, a housing, etc., which will not be described in detail here.

[0085] In the fifth aspect, based on the same inventive concept, an embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions. When the computer instructions are executed on a computer, the computer executes the steps of the above-mentioned charging protection method.

[0086] The technical solution provided in the embodiments of the present invention has at least the following technical effects or advantages:

[0087] When the output current exceeds the preset over-current protection threshold, the duration of exceeding the over-current protection threshold is accumulated; if the duration is greater than or equal to the preset delay time, the power management chip is controlled to shut down the charging of the load; if it is less than the preset delay time, normal charging is maintained, thereby avoiding triggering the charging protection when the load is momentarily overloaded but the duration is very short and will not cause damage to the display and the load. It can reduce the false triggering of the charging over-current protection when the load is momentarily overloaded, which is beneficial to improving the stability of the charging process while achieving over-current protection.

[0088] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0089] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the intention that the claimed invention requires more features than those explicitly recited in each claim. More specifically, as reflected in the claims below, inventive aspects lie in less than all the features of the individual embodiments disclosed above. Therefore, the claims that follow the specific embodiment are hereby expressly incorporated into the specific embodiment, with each claim itself serving as a separate embodiment of the present invention.

[0090] Those skilled in the art will appreciate that the modules in the devices in the embodiments may be adaptively changed and arranged in one or more devices different from the embodiments. The modules or units or components in the embodiments may be combined into one module or unit or component, and in addition they may be divided into a plurality of submodules or subunits or subcomponents. All features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this manner may be combined in any combination, except that at least some of such features and / or processes or units are mutually exclusive. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature providing the same, equivalent or similar purpose.

[0091] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims below, any one of the claimed embodiments may be used in any combination.

[0092] It should be noted that the above embodiments illustrate the present invention rather than limit it, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets shall not be construed as a limitation on the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "one" or "an" preceding a component does not exclude the presence of a plurality of such components. The present invention may be implemented by means of hardware comprising a number of different components and by means of a suitably programmed computer. In a unit claim enumerating a number of devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc., does not indicate any order. These words may be interpreted as names.

Claims

1. A charging protection method, characterized in that: Applied to a display, the method comprises: During the process of charging the load, the output current of the charging interface of the display is monitored, and the charging interface has multiple voltage and current gears for external charging; If the output current exceeds a preset overcurrent protection threshold, the duration of exceeding the overcurrent protection threshold is accumulated; If the duration is greater than or equal to the preset delay time, the power management chip of the display is controlled to turn off charging of the load; if the duration is less than the preset delay time, normal charging is maintained; Among them, before charging the load, the method also includes: obtaining the charging current supported by the load; based on the charging current, configuring an overcurrent protection threshold corresponding to the load, wherein the overcurrent protection threshold is less than the maximum protection current value set inside the power management chip, and the overcurrent protection threshold configured for loads with different charging currents is different.

2. The method according to claim 1, characterized in that The configuring the overcurrent protection threshold corresponding to the load based on the charging current includes: Determining a gain value based on the product of the charging current and a preset gain coefficient; The sum of the charging current and the gain value is used as the overcurrent protection threshold corresponding to the load.

3. The method according to claim 1, characterized in that The monitoring the output current of the charging interface includes: The output current of the power line of the charging interface is collected by a current detection chip.

4. The method according to claim 1, characterized in that The controlling the power management chip to shut down charging of the load includes: A shutdown instruction is sent to the power management chip so that the power management chip shuts down charging of the load.

5. A charging protection device, characterized in that: Applied to a display, the device comprises: A monitoring module, used to monitor the output current of the charging interface of the display during charging of the load, wherein the charging interface has multiple voltage and current gears for external charging; A time accumulation module, used for accumulating the duration of exceeding the preset overcurrent protection threshold if the output current exceeds the overcurrent protection threshold; A control module, configured to control the power management chip of the display to shut down charging of the load if the duration is greater than or equal to a preset delay time, and to maintain normal charging if the duration is less than the preset delay time; The device also includes: a configuration module, used to: obtain the charging current supported by the load; based on the charging current, configure an overcurrent protection threshold corresponding to the load, wherein the overcurrent protection threshold is less than the maximum protection current value set inside the power management chip, and the overcurrent protection threshold configured for loads with different charging currents is different.

6. A display mainboard, characterized in that: It includes a power management chip, a charging controller and a charging interface for connecting a load, wherein the charging controller is connected to the power management chip and the charging interface respectively, and the charging controller is used to control the power management chip to charge the load and execute the steps of the charging protection method as described in any one of claims 1 to 4.

7. The display mainboard according to claim 6, characterized in that: It also includes a current detection chip, the input end of which is connected to the power line of the charging interface for collecting the output current of the power line of the charging interface, and the output end of the current detection chip is connected to the charging controller.

8. The display mainboard according to claim 6, characterized in that: The power management chip is used to output a charging voltage to charge the load, and when it is detected that the output charging current is greater than a preset maximum protection current value, the charging of the load is turned off, wherein the maximum protection current value is greater than an overcurrent protection threshold set in the charging controller.

9. The display mainboard according to claim 6, characterized in that: The charging interface is a type-C interface.

10. A display, characterized in that: A display mainboard comprising any one of claims 6-9.

11. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and when the computer instructions are executed on a computer, the computer executes the steps of the charging protection method according to any one of claims 1 to 4.

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