A wireless charging method

Abstract

The embodiment of the application discloses a wireless charging method applied to a wireless charging transmitting end control chip, and the wireless charging transmitting end control chip is controlled by a micro control unit, and has the characteristics that in a foreign matter low power consumption mode, the micro control unit enters a shutdown state; a first analog detection signal is transmitted, and a first feedback signal corresponding to the first analog detection signal is received; whether the foreign matter is removed is determined according to the first feedback signal and a preset first threshold signal; if the foreign matter is removed, a low power consumption mode is entered, and the micro control unit remains in the shutdown state. Through the implementation of the wireless charging method provided by the embodiment, when the foreign matter low power consumption mode detects that the foreign matter is removed, only the wireless charging transmitting end control chip is switched to a general low power consumption mode, and the micro control unit maintains a shutdown sleep state, at this time, the micro control unit does not need to be awakened, the average standby current of the whole machine is greatly reduced, and the static endurance of a battery type wireless charging device is prolonged.

Description

Technical Field

[0001] This invention relates to the field of integrated circuit technology, and more specifically to a wireless charging method. Background Technology

[0002] Wireless charging technology, with its contactless and convenient characteristics, has been widely used in smartphones, wearable devices, smart homes, and automotive electronics. Current mainstream wireless charging systems are based on the principle of electromagnetic induction, achieving contactless energy transfer through coil coupling between the transmitter (TX) and receiver (RX). To ensure safety and avoid safety hazards caused by eddy currents generated by metallic foreign objects in alternating magnetic fields, wireless charging transmitters integrate foreign object detection functionality. To optimize energy consumption and extend device battery life, the transmitter enters a low-power standby / sleep state when no valid receiving device or foreign object is detected. In this state, the system only retains the basic detection circuitry and the microcontroller unit (MCU) for low-power operation, significantly reducing static power consumption. However, this method has a significant power consumption drawback: in scenarios where foreign objects are frequently removed, the transmitter repeatedly wakes up the main control circuit due to the "insertion-removal" action of the foreign object, leading to a significant increase in power consumption. Summary of the Invention

[0003] The purpose of this invention is to provide a wireless charging method to solve the aforementioned problems. This invention achieves this purpose through the following technical solutions.

[0004] This invention provides a wireless charging method applied to a wireless charging transmitter control chip, which is controlled by a microcontroller unit. The method includes: in a foreign object low-power mode, the microcontroller unit enters a shutdown state; transmitting a first analog detection signal and receiving a first feedback signal corresponding to the first analog detection signal; determining whether a foreign object has been removed based on the first feedback signal and a preset first threshold signal; if the foreign object has been removed, entering a low-power mode and keeping the microcontroller unit in a shutdown state.

[0005] In some embodiments, the wireless charging method includes: in a low-power mode, transmitting a second analog detection signal and receiving a second feedback signal corresponding to the second analog detection signal; when it is determined, based on the second feedback signal and a preset second threshold signal, to exit the low-power mode and enter a normal operating mode, the microcontroller unit enters a working state; transmitting a digital detection signal and receiving a third feedback signal corresponding to the digital detection signal; selecting a working mode based on the third feedback signal, the working mode including a foreign object low-power mode, a low-power mode, and a normal operating mode.

[0006] In some embodiments, the third feedback signal includes communication data.

[0007] In some embodiments, when the microcontroller is in operation, it receives analog detection signals and threshold signals set by the microcontroller. The analog detection signals and threshold signals set are different in different modes.

[0008] In some embodiments, the first feedback signal includes the number of effective oscillations. In the foreign object low power mode, if the number of effective oscillations is detected to continuously increase within a preset time period, the transmission frequency of the first analog detection signal is increased.

[0009] In some embodiments, the variation amplitude of the number of effective oscillations obtained multiple times is related to the transmission frequency by a first coefficient.

[0010] In some embodiments, when the change is less than a preset value, the transmission frequency remains fixed.

[0011] In some embodiments, the second feedback signal includes an effective number of oscillations, and the wireless charging method further includes: determining the transmission frequency of a second analog detection signal based on the second feedback signal, wherein the effective number of oscillations is inversely proportional to the transmission frequency, wherein the transmission frequency is preset by a microcontroller unit in the operating state.

[0012] In some embodiments, the variation amplitude of the number of effective oscillations obtained multiple times in low-power mode is related to the transmission frequency by a second coefficient. The first coefficient is different from the second coefficient, and both the first coefficient and the second coefficient are preset by the microcontroller unit in the working state.

[0013] In some embodiments, the transmission frequency of the simulated detection signal is gradually reduced while the effective oscillation count is stable.

[0014] Compared to existing technologies, the wireless charging method provided in this embodiment, when the foreign object removal is detected in the low-power mode, only the wireless charging transmitter control chip switches to the normal low-power mode, while the microcontroller remains in a dormant state. At this time, there is no need to wake up the microcontroller, avoiding the instantaneous milliamp-level power consumption caused by MCU power-on reset, peripheral startup, and software initialization, significantly reducing the average standby current of the whole device, extending the standby battery life of battery-based wireless charging devices, and the mode switching is completed solely by hardware combination logic with a switching latency of microseconds and no software process delay. At the same time, it can reduce the power surge caused by frequent start-stop of the microcontroller, delay chip device aging, and avoid electromagnetic interference and accidental charging safety risks caused by invalid digital Ping communication after wake-up. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a flowchart illustrating the wireless charging method provided in this embodiment;

[0017] Figure 2 This is another schematic diagram of the wireless charging method provided in this embodiment. Detailed Implementation

[0018] 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 only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] The term "coupled" or "connected" in this invention includes both direct and indirect connections, such as connections made through some active devices, passive devices, or electrical conduction media; it may also include connections made by other active or passive devices that are known to those skilled in the art and can achieve the same or similar functional purpose, such as connections made through circuits or components such as switches or follower circuits.

[0020] like Figure 1 As shown, this embodiment provides a wireless charging method applied to a wireless charging transmitter control chip, which is controlled by a microcontroller unit. The wireless charging method includes steps S10 to S40.

[0021] Step S10: In the foreign object low power mode, the microcontroller enters the shutdown state.

[0022] In this embodiment, the wireless charging transmitter control chip and the microcontroller unit can be regarded as the core control components of the wireless charging transmitter device. The microcontroller unit, as the main controller of the wireless charging transmitter device, realizes the overall logic scheduling, parameter configuration, protocol interaction and mode switching command issuance. The microcontroller unit and the wireless charging transmitter control chip establish a communication connection through the chip's internal bus and register interaction channel. The microcontroller unit can write various operating parameters, threshold parameters and control commands to the wireless charging transmitter control chip.

[0023] In this embodiment, the microcontroller unit includes a logic operation core unit, main peripherals, general-purpose registers, and a communication module. In the foreign object low-power mode, the microcontroller unit is in a shutdown state with extremely low power consumption. At this time, the system's high-frequency main clock in the microcontroller unit can be completely shut down, the CPU core stops fetching instructions, decoding, and executing all firmware programs, and the software completely stops running. Only a very low-speed backup clock is retained and does not participate in calculations. The microcontroller unit has no active calculation, protocol parsing, or instruction issuance capabilities. RAM, general-purpose registers, and configuration cache data are not lost due to power loss. Furthermore, all communication peripherals can be powered off and cannot send or receive data; the general-purpose ADC, GPIO, and timer (main timer) are turned off, with only the hardware interrupt wake-up pin remaining in a listening state; the bus interface is suspended, and the microcontroller unit no longer reads or writes parameters to the hardware domain of the wireless charging transmitter control chip. It is important to note that the microcontroller unit can passively wait for the hardware wake-up interrupt and will not actively intervene in the low-power detection process. Only when the low-power hardware domain triggers a wake-up signal will the clock be restored, the program restarted, and control of the wireless charging transmitter taken over.

[0024] In this embodiment, when the wireless charging transmitter control chip is in the foreign object low power mode, the wireless charging transmitter control chip can shut down the main power transistor and main power supply circuit connected to the external wireless charging coil, retaining only the ability to simulate Ping short-time pulse drive and feedback signal acquisition. The wireless charging transmitter control chip provides power specifically for the circuit that maintains the working state, while the power supply to other parts is turned off.

[0025] Step S20: Transmit a first analog detection signal and receive a first feedback signal corresponding to the first analog detection signal.

[0026] In this embodiment, the wireless charging transmitter control chip can be connected to the control terminal of the bridge power transistor. By controlling the bridge power transistor, electromagnetic waves are emitted through the wireless charging coil. The first analog detection signal can be an analog Ping.

[0027] In this embodiment, if there is an energy-absorbing object outside the wireless charging transmitting coil, it will affect the resonance number of the wireless charging transmitting coil. When the wireless charging transmitting coil emits electromagnetic waves, the effective oscillation number can be detected to obtain the Q value, which can be regarded as the first feedback signal corresponding to the first analog detection signal.

[0028] In this embodiment, the temperature of the wireless charging transmitter can also be monitored by NTC, and the presence of foreign objects can be determined based on the temperature. This temperature can also be regarded as the first feedback signal. For this purpose, an NTC can be set in the wireless charging transmitter, and a circuit corresponding to the NTC can be set in the wireless charging control terminal transmitter chip.

[0029] Step S30: Determine whether the foreign object has been removed based on the first feedback signal and the preset first threshold signal.

[0030] In this embodiment, when the foreign object is completely removed, the wireless charging transmitting coil returns to a near-unloaded state, significantly reducing losses, lengthening the oscillation duration, and continuously increasing the effective oscillation count. When the effective oscillation count is detected to be greater than a preset first threshold signal, it can be determined that the foreign object has been removed. Furthermore, to ensure the accuracy of the detection results, it can be set to determine that the foreign object has been removed only if the effective oscillation count is detected to be greater than the effective oscillation count for multiple consecutive rounds.

[0031] Step S40: If the foreign object is removed, enter low power mode and the microcontroller remains in a stopped state.

[0032] In this embodiment, when the wireless charging transmitter control chip is in low-power mode, it can shut down the main power transistor and main power supply circuit connected to the external wireless charging coil, retaining only the ability to drive short-time simulated Ping pulses and acquire feedback signals. The wireless charging transmitter control chip provides power specifically for the circuits that maintain their operating state, while power is turned off for other parts. It should be noted that compared to the foreign object low-power mode, the interval between simulated Ping pulses transmitted by the wireless charging transmitter control chip in low-power mode is shorter.

[0033] In this embodiment, when the foreign object removal is detected by the foreign object low-power mode, only the wireless charging transmitter control chip switches to the normal low-power mode, while the microcontroller unit remains in a shutdown and sleep state. At this time, there is no need to wake up the microcontroller unit, avoiding the instantaneous milliamp-level power consumption caused by MCU power-on reset, peripheral startup, and software initialization, which significantly reduces the average standby current of the whole device and extends the standby battery life of battery-based wireless charging devices. Moreover, the mode switching is completed solely by hardware combination logic, with a switching latency of microseconds and no software process delay. At the same time, it can reduce the power surge caused by frequent start-stop of the microcontroller unit, delay chip device aging, and avoid electromagnetic interference and accidental charging safety risks caused by invalid digital Ping communication after wake-up.

[0034] In some embodiments, the wireless charging method may further include steps S50 to S70.

[0035] Step S50: In low-power mode, transmit a second analog detection signal and receive a second feedback signal corresponding to the second analog detection signal.

[0036] In this embodiment, the wireless charging transmitter control chip can be connected to the control terminal of the bridge power transistor. By controlling the bridge power transistor, electromagnetic waves are emitted through the wireless charging coil. The second analog detection signal is an analog Ping.

[0037] In this embodiment, if there is an energy-absorbing object outside the wireless charging transmitting coil, it will affect the resonance number of the wireless charging transmitting coil. When the wireless charging transmitting coil emits electromagnetic waves, the effective oscillation number can be detected to obtain the Q value. This Q value can be regarded as the second feedback signal corresponding to the second analog detection signal.

[0038] Step S60: When it is determined to exit the low-power mode and enter the normal operation mode based on the second feedback signal and the preset second threshold signal, the microcontroller unit enters the working state.

[0039] In this embodiment, when the second feedback signal indicates that the effective oscillation count is small and is lower than the second threshold signal, it can be considered that a wireless charging receiver device or foreign object is approaching. At this time, the microcontroller unit can be woken up and the wireless charging transmitter control chip can enter the normal working mode.

[0040] Step S70: Transmit a digital detection signal and receive a third feedback signal corresponding to the digital detection signal.

[0041] In this embodiment, the digital detection signal can be a digital Ping, which carries communication data. The third feedback signal can be obtained via the charging coil of the wireless charging transmitter. When a wireless charging receiver approaches, this third feedback signal can be generated based on the signal sent by the wireless charging receiver. When a foreign object approaches, this third feedback signal can characterize the effective number of oscillations.

[0042] Step S80: Select the operating mode according to the third feedback signal. The operating modes include foreign object low power mode, low power mode and normal operation mode.

[0043] In this embodiment, when the third feedback signal indicates that the device near the wireless charging transmitter is a wireless charging receiver, the working mode is selected as normal working mode; when the third feedback signal indicates that the device near the wireless charging transmitter is a foreign object, the working mode is selected as foreign object low power mode.

[0044] In some embodiments, the third feedback signal may include communication data.

[0045] In some embodiments, when the microcontroller is in operation, it receives analog detection signals and threshold signals set by the microcontroller. The analog detection signals and threshold signals set are different in different modes.

[0046] In this embodiment, the microcontroller unit can set the intensity and period of the simulated detection signal transmitted by the wireless charging transmitter control chip in different operating modes. For example, the periods of the first simulated detection signal and the second simulated detection signal can be different. Similarly, the microcontroller unit can set the threshold signal of the wireless charging transmitter control chip in different operating modes.

[0047] In some embodiments, the first feedback signal may include the number of effective oscillations. In the foreign object low power mode, if the number of effective oscillations is detected to be continuously increasing within a preset time period, the transmission frequency of the first analog detection signal is increased.

[0048] In this embodiment, the first simulated detection signal can be a simulated Ping. It should be noted that the effective number of oscillations can be the average of the number of oscillations detected multiple times.

[0049] In this embodiment, when a continuous increase in the effective oscillation count is detected in the foreign object low-power mode, the simulated Ping transmission frequency is actively increased. This allows for accurate determination that the foreign object is gradually being removed from the coil area. By shortening the simulated Ping detection interval and increasing the sampling frequency, the critical point of complete foreign object removal is avoided due to excessively long detection intervals. This enables immediate identification upon foreign object removal and switching to normal low-power mode, resulting in a more timely state transition response. Furthermore, when switching to normal low-power mode subsequently, the current high-frequency detection cycle can be directly inherited. If a charging device approaches immediately after the foreign object is removed, there is no need to gradually shorten the low-frequency cycle again, enabling faster capture of legitimate receiving devices and reducing subsequent wake-up response latency.

[0050] In some embodiments, the second feedback signal may include an effective number of oscillations, and the wireless charging method further includes: determining the transmission frequency of a second analog detection signal based on the second feedback signal, wherein the effective number of oscillations is inversely proportional to the transmission frequency, wherein the transmission frequency is preset by a microcontroller unit in the operating state.

[0051] In this embodiment, when the wireless charging transmitter control chip is in low-power mode, the transmission frequency of the second analog detection signal can be determined based on the effective number of oscillations. It should be noted that no microcontroller unit is required during the frequency adjustment process.

[0052] In this embodiment, in low-power mode, a lower effective oscillation count indicates greater coil load loss and a higher probability of a charging receiver approaching or load disturbance. Correspondingly, increasing the simulated Ping transmission frequency and shortening the detection interval allows the effective oscillation count to drop rapidly when the load approaches. High-frequency encrypted detection can capture load state changes immediately, quickly meeting the wake-up threshold condition, shortening the microcontroller wake-up delay, and improving charging start-up response speed. Simultaneously, it achieves intelligent power balance. Under stable no-load conditions, a high effective oscillation count automatically lengthens the simulated Ping transmission cycle and reduces the transmission frequency, maintaining extremely low standby power consumption. Encrypted detection is only performed in high-monitoring scenarios where the effective oscillation count is low, avoiding unnecessary power consumption caused by high-frequency simulated Ping under no-load conditions. It is important to note that in this embodiment, in low-power mode, the wireless charging transmitter control chip autonomously adjusts the speed in a closed loop throughout the process. The microcontroller remains in a stopped state and does not participate in calculations, requiring no software intervention for cycle adjustment. This retains the advantages of low-power sleep mode while also considering load detection sensitivity, adapting to the dual needs of long standby and rapid wake-up for portable wireless charging devices.

[0053] In some embodiments, when the wireless charging transmitter control chip is in low power mode and the change in the number of valid oscillations is less than a preset value, the transmission frequency can be kept fixed.

[0054] In some embodiments, the variation amplitude of the number of effective oscillations obtained multiple times can be related to the transmission frequency by a first coefficient.

[0055] In this embodiment, when the wireless charging transmitter control chip is in foreign object low-power mode, the variation in the number of effective oscillations obtained multiple times can be regarded as the number of increases and decreases in the number of effective oscillations within a certain period of time. When the number of effective oscillations increases within this period of time, the transmission frequency can be increased; when the number of effective oscillations decreases within this period of time, the transmission frequency can be decreased. The first coefficient relationship is a positive coefficient relationship.

[0056] In some embodiments, when the wireless charging transmitter control chip is in a foreign object low power mode, and the change in the number of valid oscillations is less than a preset value, the transmission frequency can be kept fixed.

[0057] In some embodiments, the variation amplitude of the number of effective oscillations obtained by the wireless charging transmitter control chip in low power mode is related to the transmission frequency by a second coefficient. The first coefficient is different from the second coefficient, and both the first coefficient and the second coefficient are preset by the microcontroller unit in the working state.

[0058] In this embodiment, when the wireless charging transmitter control chip is in low-power mode, the variation in the number of valid oscillations obtained multiple times can be regarded as the number of increases and decreases in the number of valid oscillations within a certain period of time. When the number of valid oscillations increases within this period of time, the transmission frequency can be reduced; when the number of valid oscillations decreases within this period of time, the transmission frequency can be increased. The second coefficient relationship is a negative coefficient relationship.

[0059] In some embodiments, the transmission frequency of the simulated detection signal is gradually reduced when the effective oscillation count is stable. It should be noted that when the wireless charging transmitter control chip is in a foreign object low-power mode, the transmission frequency of the first simulated detection signal can be gradually reduced if the effective oscillation count is stable. Similarly, when the wireless charging transmitter control chip is in a low-power mode, the transmission frequency of the second simulated detection signal can be gradually reduced if the effective oscillation count is stable.

[0060] In some embodiments, when the microcontroller unit is in operation, the maximum and minimum values ​​of the transmission frequency of the first analog detection signal can be preset, as can the maximum and minimum values ​​of the transmission frequency of the second analog detection signal. Additionally, when the microcontroller unit is in operation, the step size for gradually decreasing the transmission frequency of the first analog detection signal and / or the second analog detection signal when the effective oscillation count is stable can be preset, as can the minimum value of the transmission frequency of the first analog detection signal and / or the second analog detection signal when the effective oscillation count is stable.

[0061] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. 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. Such 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, and should all be included within the protection scope of the present invention.

Claims

1. A wireless charging method, applied to a wireless charging transmitter control chip, wherein the wireless charging transmitter control chip is controlled by a microcontroller unit, characterized in that, include: In the foreign object low power mode, the microcontroller enters a shutdown state; Transmit a first simulated detection signal and receive a first feedback signal corresponding to the first simulated detection signal; The foreign object is determined to be removed based on the first feedback signal and the preset first threshold signal. If the foreign object is removed, the system enters a low-power mode, and the microcontroller remains in the shutdown state.

2. The wireless charging method according to claim 1, characterized in that, The wireless charging method includes: In the low-power mode, a second analog detection signal is transmitted, and a second feedback signal corresponding to the second analog detection signal is received; When it is determined, based on the second feedback signal and the preset second threshold signal, to exit the low-power mode and enter the normal working mode, the microcontroller unit enters the working state. Transmit a digital detection signal and receive a third feedback signal corresponding to the digital detection signal; The operating mode is selected based on the third feedback signal. The operating modes include foreign object low power mode, low power mode and normal operation mode.

3. The wireless charging method according to claim 2, characterized in that, The third feedback signal includes communication data.

4. The wireless charging method according to claim 1, characterized in that, When the microcontroller is in operation, it receives analog detection signals and threshold signals set by the microcontroller. The analog detection signals and threshold signals set are different in different modes.

5. The wireless charging method according to claim 2, characterized in that, The first feedback signal includes the effective number of oscillations. In the foreign object low power mode, if the effective number of oscillations is detected to continuously increase within a preset time period, the transmission frequency of the first analog detection signal is increased.

6. The wireless charging method according to claim 5, characterized in that, The variation amplitude of the number of effective oscillations obtained multiple times is related to the transmission frequency by a first coefficient.

7. The wireless charging method according to claim 6, characterized in that, When the change is less than a preset value, the transmission frequency remains fixed.

8. The wireless charging method according to claim 6, characterized in that, The second feedback signal includes the number of valid oscillations, and the wireless charging method further includes: The transmission frequency of the second analog detection signal is determined based on the second feedback signal, and the effective number of oscillations is inversely proportional to the transmission frequency, wherein the transmission frequency is preset by the microcontroller unit in the working state.

9. The wireless charging method according to claim 8, characterized in that, The variation amplitude of the number of effective oscillations obtained multiple times in low power mode is related to the transmission frequency by a second coefficient. The first coefficient is different from the second coefficient. Both the first coefficient and the second coefficient are preset by the microcontroller unit in the working state.

10. The wireless charging method according to any one of claims 5 to 9, characterized in that, Once the effective oscillation count is stable, gradually reduce the transmission frequency of the simulated detection signal.

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