A wireless charging interference suppression method and apparatus

Abstract

The embodiment of the application discloses a wireless charging interference suppression method and device, comprising: monitoring the event of the video transmission module, generating a double cooperative control instruction when a predetermined type of event is monitored, the double cooperative control instruction comprising a derating control instruction and a dynamic current limiting control instruction, the predetermined type of event being used to represent electromagnetic interference conflicting with link training, sending the derating control instruction to the wireless charging module to control the wireless charging module to adjust the PWM output state, and sending the dynamic current limiting control instruction to the PMIC at the same time or before the derating control instruction is sent to reduce the output current limiting threshold of the PMIC to the wireless charging module. Thus, the electromagnetic interference is effectively suppressed without increasing the hardware cost, and the suppression effect is improved.

Description

Technical Field

[0001] This invention relates to the field of electronic communication technology, and in particular to a method and apparatus for suppressing wireless charging interference. Background Technology

[0002] As electronic devices continue to evolve towards higher integration and miniaturization, products such as multi-functional docking stations, intelligent central control units, and wireless charging pads have become mainstream in the market. These devices typically integrate PD charging protocol modules, high-speed video transmission modules, and wireless charging modules into a single, confined space. However, the tight arrangement of multiple modules makes the internal electromagnetic environment of the devices increasingly complex, placing stringent requirements on electromagnetic compatibility design.

[0003] In existing technologies, the H-bridge inverter inside a wireless charging module requires high-frequency alternating switching of MOSFETs to drive the transmitting coil and generate an alternating magnetic field. This high-frequency switching action generates strong electromagnetic interference, mainly including switching transient broadband noise, high-order harmonic interference, and common-mode interference. This interference directly affects the normal operation of the physical layer of high-speed video transmission modules, particularly causing severe interference to critical timing events such as the link training and clock data recovery locking phases of the DisplayPort protocol, and the fixed-rate link training and high-bandwidth digital content protection authentication phases of the HDMI protocol. Existing hardware protection measures, such as adding shielding covers, common-mode inductors, or absorbing materials, not only significantly increase material costs and PCB layout area but also fail to completely suppress interference.

[0004] Therefore, there is a lack of existing technologies that can effectively suppress electromagnetic interference from wireless charging modules to high-speed video links without significantly increasing hardware costs. Summary of the Invention

[0005] This invention provides a method and apparatus for suppressing interference during wireless charging, which addresses the problem that suppressing electromagnetic interference from high-speed video links by wireless charging modules in the prior art requires a significant increase in hardware costs and yields poor results.

[0006] In a first aspect, embodiments of the present invention provide a wireless charging interference suppression method, applied to a main control unit, comprising: Monitor the state machine of the video transmission module to identify whether the state machine enters a predetermined type of event; When a predetermined type of event is detected, a dual coordinated control command is generated, which includes a derating control command and a dynamic current limiting control command. The predetermined type of event is used to characterize the conflict between electromagnetic interference and link training. Send a derating control command to the wireless charging module to control the wireless charging module to adjust the PWM output state; At the same time as or before sending the derating control command, a dynamic current limiting control command is sent to the PMIC to reduce the output current limit threshold of the PMIC supplying power to the wireless charging module.

[0007] Secondly, embodiments of the present invention provide a wireless charging interference suppression device, comprising: A monitoring unit is used to monitor the state machine of the video transmission module to identify whether the state machine enters a predetermined type of event; The instruction generation unit is used to generate dual cooperative control instructions when a predetermined type of event is detected. The dual cooperative control instructions include derating control instructions and dynamic current limiting control instructions. The predetermined type of event is used to characterize the conflict between electromagnetic interference and link training. The derating control unit is used to send derating control commands to the wireless charging module to control the wireless charging module to adjust the PWM output state. The dynamic current limiting unit is used to send a dynamic current limiting control command to the PMIC at the same time as or before sending the derating control command, so as to reduce the output current limit threshold of the PMIC to supply power to the wireless charging module.

[0008] Thirdly, embodiments of the present invention provide an electronic device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, it implements the method described in the embodiments of the present invention.

[0009] Fourthly, embodiments of the present invention provide a computer-readable storage medium having a computer program stored thereon, which, when executed in a computer, causes the computer to perform the methods described in the embodiments of the present invention.

[0010] The technical solution of this invention monitors events in the video transmission module. When a predetermined type of event is detected, a dual-coordinated control command is generated. This dual-coordinated control command includes a derating control command and a dynamic current limiting control command. The predetermined type of event characterizes a conflict between electromagnetic interference and link training. The derating control command is sent to the wireless charging module to control it to adjust its PWM output state. Simultaneously or before sending the derating control command, the dynamic current limiting control command is sent to the PMIC to reduce the output current limit threshold of the PMIC supplying power to the wireless charging module. Therefore, electromagnetic interference is effectively suppressed without increasing hardware costs, and the suppression effect is improved. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a flowchart of the wireless charging interference suppression method provided in the embodiments of the present invention; Figure 2 This is a hardware architecture diagram of the electronic device provided in an embodiment of the present invention; Figure 3 This is a structural diagram of the wireless charging interference suppression device provided in an embodiment of the present invention; Figure 4 This is a structural diagram of the wireless charging interference suppression system provided in an embodiment of the present invention. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0014] Based on the technical problems mentioned in the background art, the present invention aims to solve the problem in the prior art that electromagnetic interference caused by the high-frequency switching action of the wireless charging module affects the training of high-speed video links and the stable transmission of data. At the same time, it overcomes the defects of simply adding hardware shielding measures, which leads to increased costs and limited layout. The present invention achieves effective suppression of interference through a cross-domain collaborative control strategy.

[0015] Figure 1 This is a flowchart of the wireless charging interference suppression method provided in an embodiment of the present invention, such as... Figure 1 As shown, it includes: Step 100: Monitor the state machine of the video transmission module to identify whether the state machine enters a predetermined type of event.

[0016] Step 200: When a predetermined type of event is detected, generate a dual cooperative control instruction, which includes a derating control instruction and a dynamic current limiting control instruction. The predetermined type of event is used to characterize the conflict between electromagnetic interference and link training.

[0017] Step 300: Send a derating control command to the wireless charging module to control the wireless charging module to adjust the PWM output state.

[0018] Step 400: At the same time as or before sending the derating control command, send a dynamic current limiting control command to the PMIC to reduce the output current limit threshold of the PMIC supplying power to the wireless charging module.

[0019] Before detailing the specific implementation methods of each step, the wireless charging interference suppression system involved in the embodiments of the present invention will be introduced first. For example... Figure 4 As shown, Figure 4 As shown, the wireless charging interference suppression system involved in this embodiment of the invention includes a main control chip, a power management chip (PMIC, Power Management Integrated Circuit), a wireless charging module, a PD charger, and a display device.

[0020] The main control chip is a single chip integrating PD (Power Delivery) protocol processing and video transmission processing functions. It connects to the display device via an HDMI (High-Definition Multimedia Interface) interface to output high-speed video data. The main control chip also connects to the PD charger via VBUS / CC / DP signal lines for PD protocol communication and power supply negotiation. The PMIC's input terminal is connected to the VBUS_IN power supply bus, and its output terminal DC_OUT is connected to the wireless charging module to provide power. The main control chip and the PMIC are connected via an I2C bus to send dynamic current limiting control commands to the PMIC to adjust the output current limit threshold for the PMIC supplying power to the wireless charging module. The main control chip also connects to the wireless charging module via a general-purpose input / output interface GPIO_IN / OUT to send derating control commands to the wireless charging module to adjust its PWM output state. Furthermore, the main control chip connects to the wireless charging module via VBUS / CC signal lines to achieve wireless charging protocol communication and energy transfer control.

[0021] The PD charger provides power and DP (DisplayPort) signal transmission to the main control chip via a VBUS / CC / DP connection. Simultaneously, it transmits power and control information to the wireless charging module through the main control chip's VBUS / CC channel. Upon receiving a derating control command, the wireless charging module adjusts its PWM output state to reduce electromagnetic interference to the video link. The display device receives the video signal output by the main control chip via an HDMI interface. When link training or clock recovery is affected by electromagnetic interference, the main control chip performs interference suppression operations through the aforementioned coordinated control link.

[0022] The following is a detailed description of each step. Regarding step 100, the main control unit monitors the state machine of the video transmission module to identify whether the state machine has entered a predetermined type of event. The main control unit is... Figure 4 The main control chip in the system. In this embodiment of the invention, an event refers to a state transition event of the underlying physical layer state machine of the video transmission module, which characterizes the current protocol stage of the video transmission link. The purpose of monitoring these events is to determine whether there is a conflict between electromagnetic interference and link training. For example, when the video transmission module enters the link training stage, these stages rely on the precise detection and locking of weak analog signals, such as training patterns and clock edges, and are extremely sensitive to external electromagnetic interference. If the wireless charging module is in a high-frequency PWM switching state at this time, the broadband noise and harmonic components it generates can easily couple to the video link, leading to training failure or loss of lock. Therefore, after detecting these events, it is necessary to coordinate the working state of the wireless charging module and PMIC in the system, and suppress electromagnetic interference from both the source and the path by actively reducing the intensity of the interference source and passively clamping the power supply impact, thereby avoiding the conflict between electromagnetic interference and link training. The specific implementation method will be described below, and will not be elaborated on in this embodiment of the invention.

[0023] Regarding step 200, the predetermined type of event is the event corresponding to the conflict between electromagnetic interference and link training. The conflict principle is that when the H-bridge inverter of the wireless charging module is working, the MOSFETs alternately turn on and off at a high frequency of 110kHz~360kHz. This switching action generates rich harmonic components and broadband ringing noise caused by switching transients. During the link training phase, high-speed video transmission protocols such as DisplayPort and HDMI send test codes with specific amplitudes and frequencies through the physical layer, while the receiver performs clock data recovery to extract the clock signal embedded in the data stream. When the fundamental frequency or a harmonic frequency of the wireless charging module's switching noise falls within the frequency band of the video signal, the signal-to-noise ratio of the video link drops below the receiver's judgment threshold, thus causing link training failure or data channel errors. Therefore, when the main control unit detects that the video transmission module enters critical timing states such as link training or CDR (Clock Data Recovery) lock, it considers it to have detected a predetermined type of event.

[0024] Upon detecting a predetermined type of event, the main control unit generates dual collaborative control commands, including a derating control command and a dynamic current limiting control command. The derating control command controls the wireless charging module to adjust its PWM output state to reduce switching transient noise and harmonic radiation intensity at the source, i.e., actively reducing the emission intensity of interference sources. The dynamic current limiting control command controls the PMIC to lower its output current limit threshold for supplying power to the wireless charging module. During the response waiting period of the derating command, hardware current limiting clamps the potential for large transient currents and their resulting conducted noise, i.e., passively suppressing interference propagation along the power supply path.

[0025] In one alternative implementation, the predetermined event types include at least one of the following: DisplayPort protocol link training events, clock data recovery lock events, HDMI protocol fixed-rate link training events, and high-bandwidth digital content protection authentication events. Specifically, during the DisplayPort protocol link training phase, the source and receiver negotiate parameters such as link rate, voltage swing, and pre-emphasis through an auxiliary channel. Simultaneously, the physical layer sends specific training patterns for the receiver to perform equalization adaptation and clock locking. This phase has the lowest noise tolerance. Clock data recovery lock refers to the process by which the receiver recovers the sampling clock from the serial data stream using a phase-locked loop (PLL) or clock-redirecting circuit (CDR). During the locking process, the PLL is extremely sensitive to external jitter and interference. HDMI protocol fixed-rate link (FRL) training is the process by which HDMI 2.1 and later versions perform link quality assessment and parameter calibration through the physical layer before entering high-data-rate transmission. During High-bandwidth Digital Content Protection (HDCP) authentication, the source and receiver exchange and verify encryption keys via the I2C bus. Electromagnetic interference may cause I2C communication errors, leading to authentication failure. All of these events are critical timing events sensitive to electromagnetic interference, and their occurrence can trigger the dual collaborative control process provided in this embodiment of the invention.

[0026] In one alternative implementation, derating control commands and dynamic current limiting control commands are sent to the wireless charging module and the PMIC via the I2C bus or the SPI bus.

[0027] Regarding step 300, after the dual collaborative control command is generated in step 200, the main control unit sends the derating control command to the wireless charging module via an internal communication bus (e.g., I2C bus or SPI bus) or a dedicated hardware signal line. The wireless charging module responds to this command by adjusting its PWM output state. In this embodiment of the invention, the PWM output state includes the PWM switching frequency, duty cycle, dead time, and PWM output enable state. By adjusting the PWM output state, the switching rate, conduction duration, and switching edge steepness of the MOSFETs in the H-bridge inverter can be changed, thereby adjusting the power transmission intensity and harmonic distribution characteristics of the wireless charging module, reducing its electromagnetic radiation intensity to the video link, and thus providing a clean electromagnetic environment for the link training of the video transmission module.

[0028] Specifically, reducing the PWM switching frequency reduces the number of switching actions, thereby decreasing the number of harmonic pulses per unit time and shifting the fundamental and harmonic frequencies to lower frequencies to avoid sensitive frequency bands in the video link, such as the reference clock multiplier of DisplayPort, while also reducing switching losses. Reducing the duty cycle shortens the coil excitation time per cycle, thereby reducing the peak coil current and magnetic field strength, and reducing radiated energy. In this embodiment, dead time is specifically the time interval between the simultaneous turn-off of the upper and lower transistors of the same arm of the H-bridge. Increasing the dead time effectively suppresses voltage ringing caused by the parasitic capacitance and line inductance of the upper and lower transistors during switching, which is one of the main sources of high-frequency broadband noise. Increasing the dead time makes the switching edge transition smoother, thereby reducing high-frequency components. Pausing PWM output completely shuts off the power output of the wireless charging module in extreme cases, completely cutting off the interference source, such as during the critical window period of link training. All of the above adjustment methods can be flexibly combined according to the actual system design to achieve a balance between interference suppression effect and wireless charging performance loss.

[0029] Regarding step 400, it should first be noted that step 400 is executed before or simultaneously with step 300. The purpose of this setting is to leverage the nanosecond-level speed advantage of the PMIC hardware current limiting response to compensate for the millisecond-level delay required for the wireless charging module to receive and respond to derating commands via the communication bus. This allows for preemptive hard clamping of the wireless charging module's supply current during the delay window before the derating adjustment takes effect, preventing conducted noise from large current surges from coupling to the video link.

[0030] By setting the response time of the PMIC to lower the output current limit threshold to the nanosecond level, and the response time of the wireless charging module to adjust the PWM output state to the millisecond level, when the main control unit simultaneously issues derating control commands and dynamic current limiting control commands, the PMIC completes the current limit threshold adjustment within a nanosecond time. This provides immediate overcurrent protection within the millisecond-level communication delay window before the wireless charging module has completed PWM adjustment, clamping down on potential transient inrush currents and preventing them from converting into broadband conducted noise that interferes with the video link training process. Specifically, the PMIC's current limiting action is entirely implemented by hardware comparators and logic gates, without relying on firmware execution or bus communication, thus achieving extremely high speed. In contrast, the PWM parameter adjustment of the wireless charging module typically requires transmitting commands via the I2C / SPI bus, the microcontroller parsing the commands, and updating the PWM generator registers. This process involves bus frame transmission, interrupt response, and register updates, typically taking hundreds of microseconds to several milliseconds. The time difference between these two actions constitutes a protection window, during which the PMIC acts as a hardware current clamper, effectively preventing overcurrent surges before the derating takes effect.

[0031] Specifically, in this step, the main control unit sends a dynamic current limiting control command to the PMIC. Upon receiving the command, the PMIC immediately adjusts the reference voltage of its internal current sensing comparator to lower the output current limit threshold for powering the wireless charging module. Specifically, the PMIC typically integrates cycle-by-cycle current limiting or fast overcurrent protection circuitry. When the main control unit adjusts the current limiting setting via analog voltage pins or a digital interface, the PMIC's comparator reference voltage decreases accordingly, reducing the previously allowed peak output current to a lower level. If the instantaneous current consumption of the wireless charging module attempts to exceed this new threshold, the PMIC immediately limits current growth by adjusting the gate drive voltage of its internal power transistors or lowering the output voltage. This process is entirely autonomously completed by the PMIC's internal hardware logic, requiring no software intervention, with a response time in the nanosecond range, far faster than the derating response time of the wireless charging module.

[0032] After interference suppression is achieved through dual collaborative control commands, the system needs to be restored to its initial state after the conflict ends. In one optional implementation, after a predetermined type of event is detected, such as successful link training, CDR lock flag being set, or HDCP authentication being passed by reading the status register of the video transmission module, the main control unit sends a cancellation command to the wireless charging module and PMIC to switch them back to their previous states. Specifically, the main control unit reissues the cancellation command corresponding to the dual collaborative control commands, restoring the PWM switching frequency, duty cycle, and dead time of the wireless charging module to their pre-derating values, and restoring the current limiting threshold of the PMIC to its original setting, thereby restoring the system to its normal high-power wireless charging operating mode.

[0033] In one optional implementation, the PMIC exits the current-limiting state after the wireless charging module completes PWM state adjustment. Specifically, since the wireless charging module has completed derating adjustment, its actual average and peak current consumption decreases accordingly. When this actual current value falls below the dynamically adjusted current-limiting threshold of the PMIC, the current-limiting comparator inside the PMIC no longer triggers, and the PMIC automatically exits the current-limiting operating mode, reverting to constant voltage output state without requiring the main control unit to send an additional exit command. This automatic recovery mechanism simplifies the system control logic, reduces software overhead, and avoids the risk of insufficient power supply to the wireless charging module due to the main control unit failing to send a recovery command in a timely manner.

[0034] Through steps 100-400 above, this embodiment of the invention implements a dual interference suppression mechanism based on cross-domain coordination of active feedforward derating and passive feedback current limiting. This mechanism breaks through the limitations of traditional methods that rely solely on hardware shielding or pure software post-processing. It utilizes the nanosecond-level response speed of PMIC hardware current limiting to fill the millisecond-level delay window required for the wireless charging module to perform PWM derating adjustment via the communication bus. Within this delay window, the dynamically lowered current limit threshold of the PMIC can forcibly clamp any potential transient inrush current, effectively preventing this inrush current from being converted into broadband conducted noise, thereby protecting the signal integrity of the high-speed video link during vulnerable periods such as training, clock locking, and authentication.

[0035] Meanwhile, the active feedforward derating addresses the interference at its source by adjusting parameters such as PWM switching frequency, duty cycle, and dead time, directly reducing harmonic radiation and switching ringing intensity generated by the H-bridge inverter. The timing coordination of the two control commands ensures effective interference suppression both before and after the derating takes effect. After critical timing events, the system automatically or controllably returns to its original operating state, without substantially affecting the continuous power supply capability of wireless charging or increasing additional hardware shielding costs and layout area. Therefore, this invention fundamentally solves the electromagnetic interference problem of wireless charging modules on high-speed video link training with extremely low system overhead and extremely fast hardware response speed, significantly improving the reliability of terminal products and user experience.

[0036] like Figure 2 , Figure 3 As shown, this embodiment of the invention provides a wireless charging interference suppression device. The device embodiment can be implemented through software, hardware, or a combination of both. From a hardware perspective, such as... Figure 2 The diagram shown is a hardware architecture diagram of an electronic device containing a wireless charging interference suppression device according to an embodiment of the present invention. (Except for...) Figure 2 In addition to the processor, memory, network interface, and non-volatile memory shown, the electronic device in the embodiment may also include other hardware, such as a forwarding chip responsible for processing packets. Taking software implementation as an example, such as... Figure 3 As shown, a device in a logical sense is formed by the CPU of the electronic device in which it is located reading the corresponding computer program from the non-volatile memory into the memory for execution.

[0037] This application provides a wireless charging interference suppression device, comprising: The monitoring unit 31 is used to monitor the state machine of the video transmission module to identify whether the state machine enters a predetermined type of event; The instruction generation unit 32 is used to generate dual cooperative control instructions when a predetermined type of event is detected. The dual cooperative control instructions include derating control instructions and dynamic current limiting control instructions. The predetermined type of event is used to characterize the conflict between electromagnetic interference and link training. The derating control unit 33 is used to send derating control commands to the wireless charging module to control the wireless charging module to adjust the PWM output state. The dynamic current limiting unit 34 is used to send a dynamic current limiting control command to the PMIC at the same time as or before sending the derating control command, so as to reduce the output current limit threshold of the PMIC to supply power to the wireless charging module.

[0038] In some embodiments, the device is further configured to: After detecting a predetermined type of event, a cancellation command is sent to the wireless charging module and PMIC to switch them back to their previous state.

[0039] In some embodiments, the predetermined type of event includes at least one of the following: a DisplayPort protocol link training event, a clock data recovery lock event, an HDMI protocol fixed rate link training event, and a high bandwidth digital content protection authentication event.

[0040] In some embodiments, adjusting the PWM output state of the wireless charging module includes at least one of reducing the PWM switching frequency, decreasing the duty cycle, increasing the dead time, or pausing the PWM output.

[0041] In some embodiments, derating control commands and dynamic current limiting control commands are sent to the wireless charging module and the PMIC via the I2C bus or SPI bus.

[0042] In some embodiments, the response time of the PMIC to lower the output current limit threshold is in the nanosecond range, and the response time of the wireless charging module to adjust the PWM output state is in the millisecond range.

[0043] In some embodiments, after the wireless charging module completes the PWM state adjustment, the PMIC exits the current limiting state.

[0044] It is understood that the structures illustrated in the embodiments of the present invention do not constitute a specific limitation on a wireless charging interference suppression device. In other embodiments of the present invention, a wireless charging interference suppression device may include more or fewer components than illustrated, or combine some components, or split some components, or arrange different components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0045] The information interaction and execution process between the modules in the above-mentioned device are based on the same concept as the method embodiment of the present invention, and the specific details can be found in the description in the method embodiment of the present invention, and will not be repeated here.

[0046] This invention also provides an electronic device, including a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, it implements a wireless charging interference suppression method according to any embodiment of this invention.

[0047] This invention also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, causes the processor to perform a wireless charging interference suppression method according to any embodiment of this invention.

[0048] Specifically, a system or apparatus equipped with a storage medium may be provided, on which software program code implementing the functions of any of the embodiments described above is stored, and the computer (or CPU or MPU) of the system or apparatus may read and execute the program code stored in the storage medium.

[0049] In this case, the program code read from the storage medium can itself implement the function of any of the above embodiments, and therefore the program code and the storage medium storing the program code constitute part of the present invention.

[0050] Storage media embodiments for providing program code include floppy disks, hard disks, magneto-optical disks, optical disks (such as CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD+RW), magnetic tapes, non-volatile memory cards, and ROMs. Alternatively, program code can be downloaded from a server computer via a communication network.

[0051] Furthermore, it should be clear that not only can the program code read by the computer be executed, but also the operating system or other components operating on the computer can be instructed based on the program code to perform some or all of the actual operations, thereby realizing the function of any of the embodiments described above.

[0052] Furthermore, it is understood that the program code read from the storage medium is written to the memory set in the expansion board inserted into the computer or to the memory set in the expansion module connected to the computer. Then, based on the instructions of the program code, the CPU or other components installed on the expansion board or expansion module execute some and all of the actual operations, thereby realizing the function of any of the above embodiments.

[0053] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or electronic device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or electronic device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or electronic device that includes said element.

[0054] Those skilled in the art will understand that all or part of the steps of the above method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it performs the steps of the above method embodiments. The aforementioned storage medium includes various storage media that can store program code, such as ROM, RAM, magnetic disk, or optical disk.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for suppressing wireless charging interference, characterized in that, Applied to the main control unit, including: Monitor the state machine of the video transmission module to identify whether the state machine enters a predetermined type of event; When a predetermined type of event is detected, a dual coordinated control command is generated, which includes a derating control command and a dynamic current limiting control command. The predetermined type of event is used to characterize the conflict between electromagnetic interference and link training. Send a derating control command to the wireless charging module to control the wireless charging module to adjust the PWM output state; At the same time as or before sending the derating control command, a dynamic current limiting control command is sent to the PMIC to reduce the output current limit threshold of the PMIC supplying power to the wireless charging module.

2. The method according to claim 1, characterized in that, Also includes: After detecting a predetermined type of event, a cancellation command is sent to the wireless charging module and PMIC to switch them back to their previous state.

3. The method according to claim 1, characterized in that, The predefined event types include at least one of the following: DisplayPort protocol link training event, clock data recovery lock event, HDMI protocol fixed rate link training event, and high bandwidth digital content protection authentication event.

4. The method according to claim 1, characterized in that, Adjusting the PWM output state of the wireless charging module includes at least one of reducing the PWM switching frequency, decreasing the duty cycle, increasing the dead time, or pausing the PWM output.

5. The method according to claim 1, characterized in that, The derating control command and the dynamic current limiting control command are sent to the wireless charging module and the PMIC via the I2C bus or the SPI bus.

6. The method according to claim 1, characterized in that, The response time of the PMIC to lower the output current limit threshold is in the nanosecond range, and the response time of the wireless charging module to adjust the PWM output state is in the millisecond range.

7. The method according to claim 1, characterized in that, After the wireless charging module completes the PWM state adjustment, the PMIC exits the current limiting state.

8. A wireless charging interference suppression device, characterized in that, include: A monitoring unit is used to monitor the state machine of the video transmission module to identify whether the state machine enters a predetermined type of event; The instruction generation unit is used to generate dual cooperative control instructions when a predetermined type of event is detected. The dual cooperative control instructions include derating control instructions and dynamic current limiting control instructions. The predetermined type of event is used to characterize the conflict between electromagnetic interference and link training. The derating control unit is used to send derating control commands to the wireless charging module to control the wireless charging module to adjust the PWM output state. The dynamic current limiting unit is used to send a dynamic current limiting control command to the PMIC at the same time as or before sending the derating control command, so as to reduce the output current limit threshold of the PMIC to supply power to the wireless charging module.

9. An electronic device, characterized in that, It includes a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the method as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, It stores a computer program that, when executed in a computer, causes the computer to perform the method described in any one of claims 1-7.

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