A wireless charging device wake-up method and circuit based on double detection

Abstract

The application relates to a wireless charging device wake-up method and circuit based on double detection, the wake-up method comprising the following steps: performing a digital Q value detection process, outputting a corresponding first detection result, judging whether the first detection result exceeds a first preset threshold range, if the first detection result does not exceed the first preset threshold range, performing an analog PING detection process, outputting a corresponding second detection result, judging whether the second detection result exceeds a second preset threshold range, if the second detection result does not exceed the second preset threshold range, re-entering a deep sleep mode, and if the second detection result exceeds the second preset threshold range, performing a corresponding wake-up process; the two detection results jointly act, so that the system only needs to perform a digital detection with extremely low power consumption to maintain the wake-up judgment in most cases, and only enters a high-precision detection stage when there is uncertainty, thereby realizing the intelligent wake-up effect with high reliability, low false triggering rate and extremely low standby power consumption in a complex environment.

Description

Technical Field

[0001] This application relates to the technical field of wireless charging wake-up, and in particular to a method and circuit for waking up a wireless charging device based on dual detection. Background Technology

[0002] Currently, with the development of wireless charging technology, magnetic wireless power banks are widely used due to their portability and ease of use. To extend battery life, existing wireless power banks typically enter a deep sleep or shutdown state when not in use for extended periods, requiring a specific method to wake them up before use. Existing wake-up methods mainly include mechanical button wake-up, capacitive touch wake-up, and single sensor wake-up. Mechanical button wake-up requires a physical structure and is inconvenient to operate; capacitive touch wake-up is easily affected by factors such as humidity and sweat, resulting in a high rate of false touches; while single sensors, such as optical or accelerometer sensors, lack reliability in complex environments, easily leading to false wake-ups or failure to wake up. Existing wake-up methods have low reliability; single detection methods are prone to misjudgment under conditions such as inside a bag, obstruction, or environmental changes; secondly, it is difficult to balance power consumption and sensitivity, as high-sensitivity detection often comes with high power consumption, affecting standby time. Therefore, there is an urgent need for a smart wake-up solution that can achieve high reliability and high sensitivity under low power consumption conditions to improve the stability of wireless charging devices in complex environments and enhance the user experience. Summary of the Invention

[0003] To address the problem that existing wireless charging devices cannot achieve highly reliable and sensitive intelligent wake-up under low power conditions, this application provides a wireless charging device wake-up method and circuit based on dual detection.

[0004] A method for waking up a wireless charging device based on dual detection, the method comprising:

[0005] When a wireless charging device in deep sleep mode detects a preliminary trigger signal, it executes an initialization process and determines whether the preliminary trigger signal is a clear external interrupt signal. If it is a clear external interrupt signal, it executes the corresponding wake-up process.

[0006] If it is not a clear external interrupt signal, the digital Q value detection process is executed, the corresponding first detection result is output, and it is determined whether the first detection result exceeds the first preset threshold range. If it exceeds the first preset threshold range, the corresponding wake-up process is executed.

[0007] If the first preset threshold range is not exceeded, a simulated PING detection process is executed, and the corresponding second detection result is output. It is then determined whether the second detection result exceeds the second preset threshold range. If the second preset threshold range is not exceeded, the deep sleep mode is re-entered. If the second preset threshold range is exceeded, the corresponding wake-up process is executed.

[0008] When the corresponding wake-up process needs to be executed, control the wireless charging device to switch from deep sleep mode to working mode.

[0009] By adopting the above technical solution and setting up a dual detection mechanism, the wireless charging device can make refined judgments based on different detection levels after entering deep sleep, and achieve reliable identification of external triggers under extremely low power consumption conditions, thereby effectively reducing the probability of false wake-up and missed wake-up in complex environments.

[0010] Preferably, the execution steps of the digital Q-value detection process include:

[0011] A corresponding enable pulse signal is applied to the resonant unit in the wireless charging device to cause the resonant unit to enter a free oscillation state.

[0012] Acquire the oscillation waveform generated by the free oscillation state, detect and record the detection feature parameters in the oscillation waveform, the detection feature parameters including at least the low level duration and the high level duration;

[0013] The detection feature parameters are compared with preset benchmark parameters, and the difference generated by the comparison is determined as the first detection result.

[0014] By adopting the above technical solution, and by applying an instantaneous enable pulse to the resonant unit and acquiring the free oscillation waveform, the resonant state change can be digitally quantified in a very short time, thereby quickly obtaining low-power and representative detection results.

[0015] Preferably, the step of detecting and recording detection feature parameters in the oscillation waveform, wherein the detection feature parameters include at least the low-level duration and the high-level duration, includes:

[0016] Based on the built-in timing and counting unit, the level state of the oscillation waveform is recorded cyclically within each oscillation cycle;

[0017] When the oscillation waveform is detected to be at a low level, a low-level counter is started and the corresponding low-level duration is accumulated.

[0018] When the oscillation waveform is detected to switch to a high level, a high-level counter is started and the corresponding high-level duration is accumulated.

[0019] When the amplitude of the oscillation waveform naturally decays to below a preset voltage threshold and no longer triggers a new level flip, the counting operation of the timing counting unit is terminated.

[0020] By adopting the above technical solution, the cyclic counting detection method enables the system to accurately measure the duration of high and low levels of the oscillation waveform, and automatically terminates the counting after the waveform naturally decays to the set threshold, thereby forming stable and repeatable time-series characteristic data, providing a high-precision basis for judging load changes.

[0021] Preferably, the steps of the simulated PING detection process include:

[0022] Measure the reference voltage signal of the resonant unit in the wireless charging device in an unexcited state;

[0023] A preset frequency excitation signal is generated and applied to the resonant unit, and the response voltage signal of the resonant unit after the excitation signal is applied is obtained;

[0024] The signal difference between the reference voltage signal and the response voltage signal is calculated, and the signal difference is determined as the corresponding second detection result.

[0025] By adopting the above technical solution, the system actively measures the voltage difference of the resonant unit before and after excitation by combining PWM excitation and ADC sampling, thereby obtaining the signal change directly related to the energy absorption state, enabling the system to perform high-sensitivity verification in fuzzy scenarios.

[0026] Preferably, the dynamic adjustment step of the first preset threshold range includes:

[0027] Within a preset detection period, multiple first detection results and a first difference data sequence corresponding to the first detection results are recorded. The first difference data sequence is a data set of the differences between multiple first detection results and the corresponding first preset threshold range.

[0028] The first difference data sequence is averaged to generate a corresponding first average offset. The first average offset is compared with the current first preset threshold range. If the first average offset is continuously lower than the lower limit of the current first preset threshold range, the first preset threshold range is narrowed. If the first average offset is continuously higher than the upper limit of the current first preset threshold range, the first preset threshold range is expanded.

[0029] By adopting the above technical solution, the dynamic threshold adjustment step enables the detection system to have self-learning ability, and can automatically correct the judgment range based on historical detection data, thereby maintaining detection accuracy and stability under conditions of slow drift in ambient temperature, humidity or component parameters.

[0030] Preferably, the step of re-entering deep sleep mode if the second preset threshold range is not exceeded includes:

[0031] If the second preset threshold range is not exceeded, it is determined whether a new and clear external interruption signal occurs during the execution of the digital Q value detection process and the analog PING detection process.

[0032] If a new, explicit external interrupt signal is detected, the corresponding wake-up procedure will be executed.

[0033] If no new, clear external interruption signal appears, the system will re-enter deep sleep mode.

[0034] By adopting the above technical solution, an external interrupt judgment logic is added when the detection result does not meet the wake-up condition, so that the system can reconfirm the occurrence of external events before re-entering sleep, thereby avoiding missed wake-up due to signal delay or transient fluctuations.

[0035] A wireless charging device wake-up circuit based on dual detection is provided, and a wireless charging device wake-up method based on dual detection is used. The wake-up circuit includes a wireless charging control module and a main control module. The wireless charging control module includes a resonant unit, a driver chip U4, and a sampling unit.

[0036] The instantaneous enable drive terminal of the driver chip is connected to the instantaneous enable signal output terminal of the main control module, the pulse width modulation signal input terminal of the driver chip is connected to the pulse width modulation signal output terminal of the main control module, and the control signal output terminal of the driver chip is connected to the control signal input terminal of the resonant unit, so that the main control module controls the execution of the digital Q value detection process or the analog PING detection process of the driver chip.

[0037] The resonant unit is used to perform wireless charging of the wireless charging device. The sampling signal output terminal of the resonant unit is connected to the signal input terminal of the sampling unit, and the signal output terminal of the sampling unit is connected to the sampling signal input terminal of the driver chip U4, so as to determine whether to wake up the wireless charging device in deep sleep mode.

[0038] By adopting the above technical solution, through the hierarchical collaboration between the main control module and the wireless charging control module, the execution of digital detection and analog detection can be independently triggered and signal multiplexed at the hardware level, thereby improving detection efficiency and reducing system resource consumption.

[0039] Preferably, the resonant unit includes a capacitor bank consisting of capacitors C53, C55, C56 and C58 connected in parallel and a coil CL1. The control signal output terminal of the driver chip includes pin SW1 and pin SW2. The first end of the capacitor bank is connected to pin SW1, the second end of the capacitor bank is connected to the first end of the coil CL1, and the second end of the coil CL1 is connected to pin SW2.

[0040] By adopting the above technical solution, a stable LC circuit is formed by connecting multiple capacitors in parallel and combining them with coils. The energy flow is controlled by the two switching pins of the driver chip to achieve precise resonance and energy response, thereby ensuring the repeatability and sensitivity of the detection signal.

[0041] Preferably, the sampling unit includes capacitors C29, C32, and C33, resistors R33, R34, and R36, and diode D5. The anode of diode D5 is connected to the sampling signal output terminal of the resonant unit, the cathode of diode D5 is connected to the first terminal of resistor R33, the second terminal of resistor R33 is connected to the first terminal of resistor R34, the second terminal of resistor R34 is connected to the first terminal of capacitor C29, the second terminal of capacitor C29 is connected to the first channel resonant detection terminal of the driver chip U4, resistor R36 is connected to ground at a common node between the second terminal of resistor R33 and the first terminal of resistor R34, capacitor C33 is connected to ground at another common node between the second terminal of resistor R33 and the first terminal of resistor R34, and capacitor C32 is connected to ground at the common node between the second terminal of resistor R34 and the first terminal of capacitor C29.

[0042] By adopting the above technical solution, through multi-level voltage division, amplitude limiting and filtering combination, the high-frequency signal of the resonant node is reduced and shaped, so that the sampling signal is kept within the chip's detectable range and has good anti-interference ability, ensuring stable and reliable detection data.

[0043] Preferably, the sampling unit further includes resistors R29 and R30. The first end of resistor R29 is connected to the sampling signal output terminal of the resonant unit, the second end of resistor R29 is connected to the first end of resistor R30, the second end of resistor R30 is grounded, and the common node between the second end of resistor R29 and the first end of resistor R30 is connected to the second channel resonant detection terminal.

[0044] By adopting the above technical solution, a static reference potential for the detection port is provided, which enables the input signal to maintain voltage balance when there is no excitation or transient changes, preventing the detection end from drifting or being falsely triggered, thereby improving the overall reliability and environmental adaptability of the system.

[0045] In summary, this application includes at least one of the following beneficial technical effects:

[0046] This application, when the device is in deep sleep mode, does not rely directly on a single sensor signal for judgment. Instead, it first identifies external trigger signals to initially screen for abnormal interference, and then uses two complementary detection processes with different physical principles—digital Q-value detection and analog PING detection—to perform a two-stage judgment on wake-up conditions. Digital Q-value detection uses a low-power, short-pulse excitation method, causing the resonant unit to generate a free decay waveform in a very short time. By measuring the change in the duration of high and low levels during the decay process, it judges whether there has been a significant change in the environment or load state, thus achieving rapid and low-power preliminary detection without the need for long-term excitation. When digital detection fails to yield a clear result, the system automatically switches to analog PING detection. The main control module generates a PWM signal of a specific frequency to actively excite the resonant signal. By measuring the difference between the response voltage and the reference voltage, it accurately judges whether there is a real load in the external environment, thus achieving high-sensitivity secondary verification. The combined effect of the two detection results allows the system to maintain wake-up judgment in most cases by performing only the extremely low-power digital detection, and only enter the high-precision detection stage when there is uncertainty, fundamentally balancing the conflict between sensitivity and power consumption. Furthermore, the entire detection process incorporates a dynamic threshold judgment mechanism, which adaptively adjusts the judgment threshold based on historical detection results to offset error drift caused by changes in environmental temperature and humidity or component aging. Through this combined strategy of multi-layer judgment and dynamic calibration, this application achieves a smart wake-up effect with high reliability, low false trigger rate, and extremely low standby power consumption even in complex environments, ensuring the stability and response consistency of wireless charging devices during long standby periods and use in multiple scenarios. Attached Figure Description

[0047] Figure 1 This is a flowchart of a wireless charging device wake-up method based on dual detection in one embodiment of this application.

[0048] Figure 2 This is a schematic diagram of the specific structure of the wireless charging control module in a wake-up circuit of a wireless charging device based on dual detection, according to one embodiment of this application.

[0049] Figure 3 This is a schematic diagram of the main control module in a wake-up circuit of a wireless charging device based on dual detection, according to one embodiment of this application. Detailed Implementation

[0050] The present application will be further described in detail below with reference to the accompanying drawings.

[0051] In one embodiment, such as Figure 1As shown, this application discloses a method for waking up a wireless charging device based on dual detection. This method includes:

[0052] S10. When the wireless charging device in deep sleep mode detects a preliminary trigger signal, it executes the initialization process and determines whether the preliminary trigger signal is a clear external interrupt signal. If it is a clear external interrupt signal, the corresponding wake-up process is executed. Deep sleep mode refers to the hibernation stage in which the wireless charging device operates at its lowest power consumption. In this stage, the main power management unit and radio frequency section are powered off or frozen, with only the extremely low-power monitoring circuitry remaining to respond to external trigger signals. The preliminary trigger signal is an external event detection signal, which can come from physical buttons, induced disturbances from inductors, or changes in external magnetic fields, and is used to wake up the first-level response logic of the control system. External interrupt signals are high-priority hardware interrupt inputs that the main control chip can directly recognize. When such signals are detected, the system can immediately skip the detection process and execute the wake-up procedure.

[0053] S20. If it is not a clear external interrupt signal, execute the digital Q-value detection process, output the corresponding first detection result, and determine whether the first detection result exceeds the first preset threshold range. If it exceeds the first preset threshold range, execute the corresponding wake-up process. The digital Q-value detection process is a digital detection method based on the change of LC resonant characteristics. By applying a brief excitation pulse to the resonant unit and monitoring its free oscillation decay characteristics, it can determine the change of external load and obtain a preliminary judgment of the environmental state with extremely low power consumption. The resonant unit consists of a resonant circuit composed of inductors and capacitors and is the core component for realizing wireless energy coupling and environmental perception. Its parameter changes will reflect the approach of external metal or electronic devices. The first detection result is the quantitative data calculated in the digital detection, which is used to reflect the change amplitude of the resonant signal decay period or level duration. After comparing it with the first preset threshold range, it determines whether there is a significant state change.

[0054] S30. If the first preset threshold range is not exceeded, a simulated PING detection process is executed, and the corresponding second detection result is output. It is then determined whether the second detection result exceeds the second preset threshold range. If it does not exceed the second preset threshold range, the system re-enters deep sleep mode. If it exceeds the second preset threshold range, the corresponding wake-up process is executed. The simulated PING detection process is an active detection method. It uses a PWM excitation signal to drive a resonant unit to generate controlled oscillation, and then uses an ADC to sample and obtain the amplitude difference of the response waveform, achieving high-precision confirmation of the presence or absence of a load. The second detection result is the energy response difference data output by the simulated detection, which is used to compare with the second preset threshold range to determine the wake-up trigger condition.

[0055] S40. When the corresponding wake-up process needs to be executed, control the wireless charging device to switch from deep sleep mode to working mode. The first preset threshold range and the second preset threshold range are judgment benchmarks dynamically adjusted by the system based on long-term operating data, used to distinguish between normal environmental fluctuations and valid event changes. The wake-up process refers to the process by which the main control module controls the power supply and communication module to return to the working state, including the driver chip startup, the resonant unit entering the working frequency, and the system power management switching. When the device needs to execute the wake-up process, the main control system achieves a smooth transition from sleep mode to working mode through power stage drive, signal detection feedback, and state latching. For example, when a user brings their mobile phone close to a magnetic wireless charging bank, the equivalent impedance of the resonant unit changes. The digital Q value detection first captures the abnormal oscillation period and outputs a detection result higher than the threshold. The system then executes the wake-up process, enabling the charging module to quickly start and complete the wireless charging preparation.

[0056] Furthermore, the execution steps of the digital Q-value detection process include:

[0057] S201. Apply a corresponding enable pulse signal to the resonant unit in the wireless charging device to make the resonant unit enter a free oscillation state. When the main control module applies an enable pulse signal to the resonant unit, it actually controls the power switch at the drive end to output energy in a very short time, so that the circuit enters a free oscillation state after the pulse stops. The free oscillation state refers to the natural decay oscillation process completed by the resonant unit relying solely on its internal energy storage element without any external continuous excitation. Its voltage waveform exhibits logarithmic decreasing characteristics, which can truly reflect the change in energy exchange efficiency between the inductor and capacitor.

[0058] S202. Acquire the oscillation waveform generated by the free oscillation state, detect and record the detection characteristic parameters in the oscillation waveform. The detection characteristic parameters include at least the low-level duration and the high-level duration. The oscillation waveform is the voltage or current periodic curve of the circuit during the decay process, containing periodic signal characteristics of alternating high and low levels. The detection characteristic parameters are parameters obtained by quantifying the timing characteristics of the oscillation waveform, including two basic timing data: the low-level duration and the high-level duration. By measuring the changes in these two durations, the resonant energy loss rate and the trend of quality factor change can be determined.

[0059] S203. The detected characteristic parameters are compared with preset benchmark parameters, and the difference generated by the comparison is determined as the first detection result. When the acquired first detection characteristic parameters are compared with the benchmark parameters, the numerical difference representing the degree of deviation of the current resonance state can be calculated. This difference is the first detection result, which is an important basis for judging whether there is a load approaching or environmental change. If the difference exceeds a preset threshold, it indicates that the resonance quality factor has been significantly changed, and the system can trigger the wake-up logic accordingly.

[0060] Furthermore, the step of detecting and recording detection characteristic parameters in the oscillation waveform, wherein the detection characteristic parameters include at least the low-level duration and the high-level duration, includes:

[0061] S2021: Based on the built-in timing and counting unit, the level state of the oscillation waveform is recorded cyclically within each oscillation cycle;

[0062] S2022: When the oscillation waveform is detected to be at a low level, start the low level counter and accumulate the corresponding low level duration;

[0063] S2023. When the oscillation waveform is detected to switch to a high level, start the high-level counter and accumulate the corresponding high-level duration.

[0064] S2024. When the amplitude of the oscillation waveform naturally decays to below the preset voltage threshold and no longer triggers a new level flip, the counting operation of the timing counting unit is terminated.

[0065] In this specific implementation, the system samples the oscillation waveform output by the resonant unit throughout the entire process using the timing and counting unit of the main control module. The timing and counting unit has a built-in high-precision clock source, capable of detecting changes in the level state with microsecond-level resolution. When the oscillation waveform enters a new cycle, the system identifies the rising and falling edges of the waveform using a hardware comparator and triggers the counting logic. The counting logic begins accumulating the low-level duration when it detects the oscillation waveform is at a low level, recording the duration of the low-level signal in real time through an internal counting register. When it detects the waveform flipping to a high level, it automatically stops counting the low level and starts a high-level counter, recording the high-level duration in the same way. During this process, the system generates a set of corresponding timing data after each complete cycle of high and low level accumulation and writes this data to a buffer for subsequent processing. As the amplitude of the oscillation signal gradually decreases during the free decay phase, the voltage at the detection terminal is divided and filtered before being input to the comparison circuit. When the detected voltage is lower than a preset decay threshold and no new level flip occurs for several consecutive cycles, the control logic immediately shuts down the timing and counting unit, stops data acquisition, and outputs the final counting result to the calculation unit of the main control module. The main control module then calculates the oscillation period characteristics and attenuation ratio based on the accumulated high and low level durations to reflect the quality factor changes of the resonant circuit. This counting method captures the timing characteristics of free oscillations under discontinuous excitation, enabling accurate detection with extremely low power consumption. For example, after a short pulse excitation, the voltage waveform of the resonant unit decays exponentially. The main control module activates the timing and counting unit, detecting that the low level lasts an average of 18 microseconds and the high level lasts an average of 22 microseconds in each cycle, until the voltage decays below 0.3 volts and counting stops. Compared to the timing data under normal conditions, the current detection result shows a shorter period and faster attenuation, leading the system to determine that an external conductor is approaching and triggering the next wake-up determination process.

[0066] Furthermore, the steps for simulating the PING detection process include:

[0067] S3011. Measure the reference voltage signal of the resonant unit in the wireless charging device under no-excitation state; the reference voltage signal refers to the voltage reference value of the resonant unit under static electrical state when there is no external excitation. This voltage is determined by the residual energy, parasitic capacitance and ambient electromagnetic field in the resonant circuit, and is used as a comparison signal to judge the difference in excitation response.

[0068] S3012. Generate an excitation signal of a preset frequency and apply it to the resonant unit, then acquire the response voltage signal of the resonant unit after the excitation signal is applied. The excitation signal is a pulse width modulation signal with a specific frequency and duty cycle generated by the main control module. It is applied to the resonant unit through the drive circuit, causing the unit to enter a controlled oscillation state. Its waveform frequency is usually consistent with or close to the wireless charging resonant frequency to ensure that the circuit response is representative. The preset frequency is a fixed excitation frequency determined by the system according to the resonant circuit design parameters, generally between 100kHz and 200kHz. By maintaining frequency stability, the response voltage of the resonant circuit can be mainly affected by external load and environmental factors, thereby improving detection sensitivity. The response voltage signal is the AC voltage waveform generated by the resonant unit under the action of the excitation signal. The amplitude and phase of this signal depend on the load coupling state, quality factor, and energy loss, and are important physical quantities reflecting the approach or removal of external objects.

[0069] S3013. Calculate the signal difference between the reference voltage signal and the response voltage signal, and determine the signal difference as the corresponding second detection result. The signal difference is the result obtained by the main control module through the analog-to-digital converter to collect voltage data before and after excitation and calculate the difference between the two. Its value directly corresponds to the amplitude of the resonant energy change and is a key parameter for judging whether there is interference from external conductors or electronic devices. The second detection result is the final judgment data generated based on the signal difference, which is used to indicate the degree of abnormality of the resonant unit's energy response within the current detection cycle and serves as the main basis for whether to trigger wake-up. For example, when the wireless charging bank is in standby mode, the main control module first collects the static voltage of the resonant unit as 0.25 volts, then applies PWM excitation with a frequency of 128kHz, and measures that the response voltage rises to 0.85 volts. The calculated signal difference is 0.6 volts, which is higher than the system's set wake-up threshold of 0.5 volts. The control logic then determines this result as a valid detection event and executes the wake-up process to put the wireless charging module into working mode.

[0070] Furthermore, the dynamic adjustment steps for the first preset threshold range include:

[0071] S01. Within a preset detection period, record multiple first detection results and a first difference data sequence corresponding to the first detection results. The first difference data sequence is a data set of the differences between multiple first detection results and the corresponding first preset threshold range.

[0072] S02. The first difference data sequence is averaged to generate a corresponding first average offset. The first average offset is compared with the current first preset threshold range. If the first average offset is continuously lower than the lower limit of the current first preset threshold range, the first preset threshold range is narrowed. If the first average offset is continuously higher than the upper limit of the current first preset threshold range, the first preset threshold range is expanded.

[0073] S03. Within a preset detection period, record multiple second detection results and the second difference data sequence corresponding to the second detection results. The second difference data sequence is a data set of the differences between multiple second detection results and the corresponding second preset threshold range.

[0074] S04. The second difference data sequence is averaged to generate a corresponding second average offset. The second average offset is compared with the current second preset threshold range. If the second average offset is continuously lower than the lower limit of the current second preset threshold range, the second preset threshold range is narrowed. If the second average offset is continuously higher than the upper limit of the current second preset threshold range, the second preset threshold range is expanded.

[0075] In this specific implementation, the system continuously records the first detection results obtained from multiple digital Q-value detection processes within a fixed detection cycle through the main control module. Each detection result is then compared to its corresponding first preset threshold range, forming a continuous sequence of difference data. This difference data sequence reflects the detection fluctuations of the resonant unit over different time periods, including minor deviations caused by changes in ambient temperature and humidity, coil temperature rise, device aging, and background electromagnetic interference. After each detection cycle, the main control module performs a weighted average of all difference data to obtain a first average offset representing the overall trend. Subsequently, the system compares this average offset with the currently stored first preset threshold range in real time. If the average offset is below the lower limit of the threshold range for multiple consecutive detection cycles, it indicates that the system's detection output is generally low. The main control logic will automatically narrow the threshold range to make the detection conditions more stringent, thus avoiding false wake-ups triggered by environmental noise. Conversely, when the average offset is continuously higher than the upper limit of the threshold range, it indicates that the current reference parameters deviate from the actual state. The system will automatically expand the threshold range to make the judgment logic more lenient, thereby ensuring that the detection can still correctly identify real events under drift conditions. In this process, the threshold range is adjusted using a smooth incremental or incremental algorithm to avoid sudden changes caused by a single anomaly, thereby achieving dynamic adaptive updates of the benchmark. This mechanism enables the detection system to possess long-term stability and environmental self-compensation capabilities, maintaining accurate judgment precision under different temperatures, humidity levels, and changes in component characteristics after long-term use. For example, in 20 consecutive tests, the first detection results recorded by the main control module are generally about 5% lower than the lower limit of the reference threshold. After averaging, the first average offset is determined to be -0.04 volts. The system judges this as a high detection benchmark and automatically narrows the upper and lower bounds of the first preset threshold range, making the new detection range closer to the actual response amplitude, thus maintaining sensitive and stable wake-up judgment performance in subsequent operations.

[0076] Furthermore, the step of re-entering deep sleep mode if the second preset threshold range is not exceeded includes:

[0077] S3021. If the second preset threshold range is not exceeded, determine whether a new and clear external interrupt signal occurs during the execution of the digital Q value detection process and the analog PING detection process.

[0078] S3022. If a new, explicit external interrupt signal appears, the corresponding wake-up procedure will be executed.

[0079] S3023. If no new, clear external interruption signal appears, re-enter deep sleep mode.

[0080] In this specific implementation, if the system determines that the second detection result does not reach the set second preset threshold range after completing two levels of detection, the main control module will not immediately shut down the detection, but will instead enter the signal verification stage. During this stage, the main control module continuously monitors the input status from the hardware interrupt controller to confirm whether a new, explicit external interrupt signal has appeared during the execution of digital Q-value detection and analog PING detection. The external interrupt signal is acquired in real time by the low-power wake-up port and may include events such as button triggering, power plugging / unplugging, or transient magnetic field strength changes. When this signal is detected, the system will immediately abort the sleep decision and enter the wake-up control path, activating the wireless charging function by starting the main power supply, restoring the MCU main clock, and the RF drive module. If no new interrupt signal is captured within the detection window, the main control module issues a command to shut down the PWM drive, ADC sampling, and resonance monitoring functions, placing the power conversion stage and peripheral sensing units in standby power-off state, and switching the main clock to a low-speed oscillation source to maintain basic timing. Finally, the system re-enters deep sleep mode, thereby minimizing power consumption. During this process, the sleep decision logic latches the current detection state through a status register, ensuring that it can restart from the latest detection benchmark when triggered again, thus improving the system's continuity of response to external changes. For example, when the user does not place a mobile phone near the device, the simulated detection result shows that the response voltage difference is lower than the threshold, and the system enters the interrupt listening stage. However, no button action or magnetic induction change is detected at this time, so the main control chip shuts down the drive output and sampling channel, reducing the overall power consumption to the microampere level, and the device enters deep sleep until it is woken up again by the next detection cycle or an external interrupt event.

[0081] In one specific embodiment, the dual-detection-based wireless charging device wake-up method is applied to a magnetic wireless power bank system. This system includes a main control module, a driver chip, and a resonant unit and a sampling unit connected to them. When the wireless charging device is in deep sleep mode, the main control module is in a low-power standby state, retaining only the minimum hardware circuitry for external signal detection.

[0082] During operation, when the system detects an external trigger signal, the main control module first executes an initialization process to restore part of the clock and interrupt response logic to determine whether the trigger is a clear external interrupt signal. If the determination result is a clear external interrupt, the system directly executes the wake-up process, outputting a control signal through the main control module to switch the driver chip to normal operating mode and activate the wireless charging function. If the trigger signal is not a clear external interrupt, the system initiates a dual detection process to further verify whether a wake-up is required.

[0083] In the first detection stage, the main control module executes a digital Q-value detection process. The main control module outputs a short pulse signal to the instantaneous enable drive terminal of the driver chip via the instantaneous enable signal output terminal, causing the driver chip to control the resonant unit into a free oscillation state. At this time, the resonant circuit composed of the coil and capacitor group in the resonant unit generates a naturally decaying oscillation waveform without continuous excitation. The main control module acquires this waveform in real time through the first channel resonant detection terminal of the driver chip and uses the built-in timing and counting unit to record the cumulative data of the low-level duration and high-level duration in each oscillation cycle. Subsequently, the main control module compares the obtained first detection characteristic parameter with the pre-stored first reference parameter to calculate the corresponding first detection result. When the detection result exceeds the first preset threshold range, the system determines that an external metal conductor or wireless charging terminal is approaching and immediately executes the wake-up process. Because this detection process relies only on short-term excitation and digital counting, the overall system power consumption is extremely low, making it suitable for rapid detection in long-term standby environments.

[0084] If the digital Q-value detection result does not exceed the first preset threshold range, the system continues to execute the second detection, namely the simulated PING detection process. The main control module generates a PWM excitation signal of a preset frequency through the pulse width modulation signal output terminal of the driver chip, causing the driver chip to control the resonant unit to perform controlled resonance. Before this, the main control module acquires the reference voltage signal of the resonant unit in the unexcited state through the second channel resonant detection terminal of the driver chip; when the PWM excitation signal is applied, it samples again to acquire the response voltage signal of the resonant unit and calculates the voltage difference between the two. This difference serves as the second detection result, reflecting the amplitude of energy absorption and impedance change of the resonant unit. If this result exceeds the second preset threshold range, the system determines that there is an effective load or magnetic attraction device approaching and enters the wake-up process; if the difference does not exceed the threshold, the system does not wake up temporarily and continues to determine whether there is a new explicit external interrupt signal input during the detection period.

[0085] When a new, explicit external interrupt signal is detected during the detection process, the system immediately interrupts the detection and executes the wake-up procedure. If no new interrupt signal is detected, the main control module shuts down the PWM drive and sampling path, stops resonance monitoring, and controls the system to re-enter deep sleep mode. In sleep mode, only the external interrupt detection module and the ultra-low power clock are retained to ensure that the system can respond instantly upon the next trigger.

[0086] In this embodiment, both the first preset threshold range and the second preset threshold range have dynamic adjustment capabilities. The main control module records historical detection results and generates corresponding difference data sequences over multiple detection cycles. By calculating the average offset, it automatically corrects the upper and lower limits of the threshold range, enabling the system to maintain detection sensitivity and accuracy even under conditions of environmental temperature and humidity changes or device characteristic drift.

[0087] For example, when the wireless charging bank is stationary on a desktop, the system executes a digital Q-value detection process. The duration of the detected high and low levels is basically consistent with the reference parameter, and the first detection result is within the threshold range, so the system does not wake up. Subsequently, the main control module triggers a simulated PING detection. The difference between the sampled response voltage and the reference voltage is only 0.08 volts, which is lower than the second preset threshold range of 0.1 volts, indicating a no-load state, and the device re-enters deep sleep. If the user brings the phone close to the charging surface at this time, the impedance of the resonant unit changes, and the response voltage difference rises to 0.5 volts upon re-detection, exceeding the threshold range. The main control module immediately triggers the wake-up process, enabling the wireless charging circuit to enter working mode and complete the charging start-up. This embodiment achieves highly reliable wake-up control under low power consumption conditions, effectively improving the environmental adaptability and ease of use of magnetic wireless charging devices.

[0088] like Figure 2-3 As shown, a wireless charging device wake-up circuit based on dual detection is used. The wake-up circuit includes a wireless charging control module and a main control module. The wireless charging control module includes a resonant unit, a driver chip U4 and a sampling unit.

[0089] The instantaneous enable drive terminal of the driver chip is connected to the instantaneous enable signal output terminal of the main control module, the pulse width modulation signal input terminal of the driver chip is connected to the pulse width modulation signal output terminal of the main control module, and the control signal output terminal of the driver chip is connected to the control signal input terminal of the resonant unit, so that the main control module controls the execution of the driver chip's digital Q value detection process or analog PING detection process.

[0090] The resonant unit is used to perform wireless charging of the wireless charging device. The sampling signal output terminal of the resonant unit is connected to the signal input terminal of the sampling unit, and the signal output terminal of the sampling unit is connected to the sampling signal input terminal of the driver chip U4 to determine whether to wake up the wireless charging device in deep sleep mode.

[0091] In one specific implementation, the wireless charging device wake-up circuit based on dual detection includes a main control module and a wireless charging control module. The wireless charging control module consists of a driver chip U4, a resonant unit, and a sampling unit. The entire circuit is designed to achieve adaptive detection and rapid wake-up of external load changes in a standby state with extremely low power consumption, thereby ensuring that the wireless charging device can still reliably start up under complex or obstructed environmental conditions.

[0092] The main control module employs a low-power microcontroller, integrating a pulse control logic unit, a PWM output unit, a timing detection unit, and adaptive threshold judgment logic. The driver chip U4 is the core power control and signal detection component of the wireless charging system. Its instantaneous enable driver terminal is electrically connected to the instantaneous enable signal output terminal of the main control module, used to receive short pulse signals emitted by the main control module. When the system is in deep sleep mode and detects a preliminary trigger signal, the main control module first activates the instantaneous enable output, briefly energizing the half-bridge driver stage inside the driver chip U4, causing the resonant unit to enter a free oscillation state for subsequent digital Q-value detection.

[0093] The pulse width modulation (PWM) signal input terminal of the driver chip U4 is connected to the PWM output terminal of the main control module to receive the high-frequency excitation signal generated by the main control module. This PWM signal is used to control the alternating conduction of the power transistors inside the driver chip, thereby applying controlled AC excitation to the resonant unit and realizing active measurement in the analog PING detection process. When the main control module determines that the external state cannot be determined based on the previous digital detection results, the PWM output unit is activated, the driver chip U4 enters the controlled drive mode, and outputs a stable pulse width modulation signal to the resonant unit to actively excite the resonant circuit and sample the energy response.

[0094] The resonant unit consists of an inductor CL1 and multiple parallel capacitors (such as C53, C55, C56, and C58) forming an LC resonant circuit to generate a magnetic field and sense changes in the external load. During operation, the inductor CL1 and the capacitor bank together form a high-Q resonant structure, and its equivalent impedance changes as an external metal object or wireless charging terminal approaches. A sampling node VTANK is set at the output of the resonant unit to extract the resonant voltage signal. This signal is voltage-conditioned by the sampling unit and then transmitted to the sampling signal input of the driver chip U4.

[0095] The sampling unit consists of a voltage divider and filter network composed of resistors, capacitors, and diodes. Specifically, diodes prevent high-frequency reverse current feedback to the sampling channel, the resistor divider limits the input voltage amplitude, and the capacitor smooths the resonant waveform. The voltage signal conditioned by this sampling network reflects the actual operating state of the resonant circuit. The sampling channel inside the driver chip U4 performs analog-to-digital conversion or level determination on this signal and feeds the data back to the main control module to determine whether the system needs to switch from deep sleep mode to operating mode.

[0096] When the system is in the digital Q-value detection phase, the main control module excites the resonant unit with an instantaneous pulse, and the waveform output by the sampling unit is acquired by the driver chip U4 to calculate the oscillation period and decay rate. If the detection result exceeds the first preset threshold range, the main control module immediately outputs a control signal to start the system wake-up; if the detection result does not exceed the limit, the main control module starts the PWM driver to perform simulated PING detection, and determines whether there is an effective load by comparing the voltage difference between the unexcited and excited states.

[0097] Furthermore, such as Figure 2 As shown, the resonant unit includes a capacitor bank consisting of capacitors C53, C55, C56 and C58 connected in parallel and a coil CL1. The control signal output terminal of the driver chip includes pins SW1 and SW2. The first end of the capacitor bank is connected to pin SW1, the second end of the capacitor bank is connected to the first end of coil CL1, and the second end of coil CL1 is connected to pin SW2.

[0098] In one specific embodiment, the resonant unit consists of an LC resonant circuit formed by a coil CL1 and a capacitor bank consisting of multiple capacitors connected in parallel. This circuit is used to achieve efficient energy transfer and status detection during the operation of the wireless charging device. The capacitor bank is formed by capacitors C53, C55, C56, and C58 connected in parallel. The overall capacitance is equivalent to the sum of the individual capacitors, providing sufficient energy storage capacity and a stable resonant frequency during resonance. One end of the capacitor bank is connected to the control signal output pin SW1 of the driver chip U4, and the other end is connected to the first end of the coil CL1 through the node VTANK. The second end of the coil CL1 is connected to another control signal output pin SW2 of the driver chip U4.

[0099] Under normal operating conditions, the driver chip U4 outputs complementary pulse signals to the SW1 and SW2 pins through its internal half-bridge driver structure, forming a drive waveform that alternates between high and low levels, thereby establishing an alternating current in the resonant unit. The capacitor bank interacts with the coil CL1 to form a closed LC circuit, generating electromagnetic resonance at a certain frequency. This causes the coil CL1 to output a stable magnetic field to drive the external wireless charging receiver for energy coupling. Because capacitors C53, C55, C56, and C58 are NPO (C0G) high-stability ceramic capacitors with low temperature coefficients and low dielectric losses, the resonant frequency remains stable under different ambient temperatures, thereby improving the system's energy transfer efficiency and detection accuracy.

[0100] When the device is in low-power detection mode, the driver chip U4 can apply a pulse drive to pins SW1 and SW2 briefly via the instantaneous enable signal from the main control module, causing the resonant unit to enter a free oscillation state. At this time, the energy stored in the LC circuit completes the self-excitation and decay process in a very short time, forming a natural oscillation waveform. The system detects the duration and decay rate of this oscillation waveform through the sampling unit, thereby indirectly reflecting the change in the equivalent impedance of coil CL1. When an external metal conductor or wireless charging terminal approaches, the equivalent inductance and quality factor Q of the coil change, and the shape of the oscillation decay curve also changes accordingly. The main control module can determine whether an external target is approaching based on this change and decide whether to trigger wake-up accordingly.

[0101] In the structural design of coil CL1, a multi-turn spiral winding method is adopted, resulting in high magnetic flux concentration. Combined with a parallel capacitor bank, this forms a high-quality resonant network, improving energy coupling efficiency and providing sufficient sensitivity in detection mode. The equivalent capacitance of the capacitor bank and the inductance of coil CL1 together determine the resonant frequency. The system uses the internal PWM signal control of the driver chip U4 to dynamically adjust the driving frequency, precisely locking it near the resonant point to achieve optimal power output and high-precision detection.

[0102] Furthermore, such as Figure 2 As shown, the sampling unit includes capacitors C29, C32, and C33, resistors R33, R34, and R36, and diode D5. The anode of diode D5 is connected to the sampling signal output terminal of the resonant unit, and the cathode of diode D5 is connected to the first terminal of resistor R33. The second terminal of resistor R33 is connected to the first terminal of resistor R34, and the second terminal of resistor R34 is connected to the first terminal of capacitor C29. The second terminal of capacitor C29 is connected to the first channel resonant detection terminal of driver chip U4. Resistor R36 is connected between a common node between the second terminal of resistor R33 and the first terminal of resistor R34 and ground. Capacitor C33 is connected between another common node between the second terminal of resistor R33 and the first terminal of resistor R34 and ground. Capacitor C32 is connected between the common node between the second terminal of resistor R34 and the first terminal of capacitor C29 and ground.

[0103] Furthermore, such as Figure 2 As shown, the sampling unit also includes resistors R29 and R30. The first end of resistor R29 is connected to the sampling signal output terminal of the resonant unit, the second end of resistor R29 is connected to the first end of resistor R30, the second end of resistor R30 is grounded, and the common node between the second end of resistor R29 and the first end of resistor R30 is connected to the second channel resonant detection terminal.

[0104] In one specific embodiment, the sampling unit is used to extract a valid detection signal from the oscillation signal output by the resonant unit, so as to realize real-time monitoring of the operating state and resonant characteristics of coil CL1. The sampling unit includes a first signal shaping and filtering network composed of diode D5, resistors R33, R34, R36, capacitors C29, C32, and C33, and a second-channel sampling voltage divider network composed of resistors R29 and R30. The two circuits correspond to the two resonant detection channel input terminals of the driver chip U4, respectively, realizing layered sampling and analysis of signals with different amplitudes and frequency bands.

[0105] In its working principle, the VTANK node at the output of the resonant unit generates a high-frequency alternating voltage signal, the amplitude of which and its attenuation rate change with the load on coil CL1. This node is first input to the sampling network through diode D5. The anode of D5 is connected to the VTANK node, and the cathode is connected to the first end of resistor R33. Diode D5 acts as a unidirectional conductor, rectifying the high-frequency AC signal into a unidirectional pulse waveform to prevent the signal from flowing back into the resonant circuit and ensuring that the detection process does not interfere with the main resonant channel. Resistors R33 and R34 are connected in series to form a signal attenuation path. The amplitude of the rectified signal is controlled by resistive voltage division to ensure that it falls within the input range of the detection port of driver chip U4.

[0106] At the connection point of R33 and R34, resistor R36 and capacitor C33 are connected in parallel to ground, forming an RC absorption network to weaken high-frequency glitches and spikes in the resonant signal and improve the stability of the detected waveform. This node also serves as a signal averaging and noise filtering point. The output of resistor R34 is connected to capacitor C29, and the other end of C29 is connected to the first channel resonant detection terminal VDM of driver chip U4 for AC filtering and steady-state holding of the signal. The presence of C29 ensures that the rectified pulse signal maintains a certain voltage level at the moment of chip sampling, facilitating accurate detection by the chip's internal ADC module. Capacitor C32 is connected in parallel between R34 and C29 to further smooth voltage changes and eliminate coupling interference, thereby obtaining a continuous and stable detection level signal.

[0107] Meanwhile, the resonant output node VTANK is also connected to the second channel resonant detection terminal of the driver chip U4 via a voltage divider branch consisting of resistors R29 and R30. The series voltage divider between R29 and R30 attenuates the high-amplitude resonant signal to a safe detection range and provides the original AC signal waveform to the chip through the intermediate node. This channel is mainly used to capture the frequency characteristics and phase information of the resonant signal, complementing the rectification detection results of the first channel. Chip U4, through its internal dual-channel detection and comparison algorithm, can simultaneously analyze the frequency drift and amplitude changes of the oscillation waveform, thereby accurately determining the operating state of the resonant circuit.

[0108] For example, when a wireless charging device enters standby detection mode, the driver chip U4 periodically triggers the resonant unit to generate short-term oscillations. The oscillation signal is output through the VTANK node and then split into two paths by the sampling unit: one path is rectified by D5, attenuated by the R33-R34 network, and smoothed by C29 to form a DC approximate waveform, reflecting the attenuation characteristics of the resonant amplitude over time; the other path maintains the original AC signal shape through the R29-R30 network, reflecting the oscillation frequency and phase characteristics. The chip internally compares the relative changes of the two signals to determine the presence of external metallic objects or an effective receiving coil. When an external metallic object approaches coil CL1, the resonant attenuation accelerates and the amplitude decreases, resulting in a significant drop in the voltage of the first channel; when an external wireless charging device approaches and couples with it, the resonant frequency shifts slightly, and the phase of the second channel waveform changes accordingly. The chip makes a comprehensive judgment based on the difference in dynamic response between the two, achieving fast and accurate object recognition and energy coupling state detection. This sampling unit structure features high signal extraction efficiency, strong anti-interference capability, and fast response speed. By using a dual-channel detection method, the amplitude and frequency information of the resonant system can be obtained simultaneously. This can be used for the detection of metallic foreign objects and to assist in the automatic frequency modulation control, providing a stable and reliable signal feedback basis for the wireless charging system.

[0109] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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 this application, and should all be included within the protection scope of this application.

Claims

1. A method for waking up a wireless charging device based on dual detection, characterized in that, The wireless charging device wake-up method based on dual detection includes: When a wireless charging device in deep sleep mode detects a preliminary trigger signal, it executes an initialization process and determines whether the preliminary trigger signal is a clear external interrupt signal. If it is a clear external interrupt signal, it executes the corresponding wake-up process. If it is not a clear external interrupt signal, the digital Q value detection process is executed, the corresponding first detection result is output, and it is determined whether the first detection result exceeds the first preset threshold range. If it exceeds the first preset threshold range, the corresponding wake-up process is executed. If the first preset threshold range is not exceeded, a simulated PING detection process is executed, and the corresponding second detection result is output. It is then determined whether the second detection result exceeds the second preset threshold range. If the second preset threshold range is not exceeded, the deep sleep mode is re-entered. If the second preset threshold range is exceeded, the corresponding wake-up process is executed. When the corresponding wake-up process needs to be executed, control the wireless charging device to switch from deep sleep mode to working mode; The dynamic adjustment steps for the first preset threshold range include: Within a preset detection period, multiple first detection results and a first difference data sequence corresponding to the first detection results are recorded. The first difference data sequence is a data set of the differences between multiple first detection results and the corresponding first preset threshold range. The first difference data sequence is averaged to generate a corresponding first average offset. The first average offset is compared with the current first preset threshold range. If the first average offset is continuously lower than the lower limit of the current first preset threshold range, the first preset threshold range is narrowed. If the first average offset is continuously higher than the upper limit of the current first preset threshold range, the first preset threshold range is expanded.

2. The method for waking up a wireless charging device based on dual detection according to claim 1, characterized in that, The execution steps of the digital Q-value detection process include: A corresponding enable pulse signal is applied to the resonant unit in the wireless charging device to cause the resonant unit to enter a free oscillation state. Acquire the oscillation waveform generated by the free oscillation state, detect and record the detection feature parameters in the oscillation waveform, the detection feature parameters including at least the low level duration and the high level duration; The detection feature parameters are compared with preset benchmark parameters, and the difference generated by the comparison is determined as the first detection result.

3. The method for waking up a wireless charging device based on dual detection according to claim 2, characterized in that, The step of detecting and recording detection feature parameters in the oscillation waveform, wherein the detection feature parameters include at least the low-level duration and the high-level duration, includes: Based on the built-in timing and counting unit, the level state of the oscillation waveform is recorded cyclically within each oscillation cycle; When the oscillation waveform is detected to be at a low level, a low-level counter is started and the corresponding low-level duration is accumulated. When the oscillation waveform is detected to switch to a high level, a high-level counter is started and the corresponding high-level duration is accumulated. When the amplitude of the oscillation waveform naturally decays to below a preset voltage threshold and no longer triggers a new level flip, the counting operation of the timing counting unit is terminated.

4. The method for waking up a wireless charging device based on dual detection according to claim 1, characterized in that, The steps of the simulated PING detection process include: Measure the reference voltage signal of the resonant unit in the wireless charging device in an unexcited state; A preset frequency excitation signal is generated and applied to the resonant unit, and the response voltage signal of the resonant unit after the excitation signal is applied is obtained; The signal difference between the reference voltage signal and the response voltage signal is calculated, and the signal difference is determined as the corresponding second detection result.

5. The method for waking up a wireless charging device based on dual detection according to claim 1, characterized in that, The step of re-entering deep sleep mode if the second preset threshold range is not exceeded includes: If the second preset threshold range is not exceeded, it is determined whether a new and clear external interruption signal occurs during the execution of the digital Q value detection process and the analog PING detection process. If a new, explicit external interrupt signal is detected, the corresponding wake-up procedure will be executed. If no new, clear external interruption signal appears, the system will re-enter deep sleep mode.

6. A wake-up circuit for a wireless charging device based on dual detection, characterized in that, Using the wireless charging device wake-up method based on dual detection as described in any one of claims 1-5, the wake-up circuit includes a wireless charging control module and a main control module, and the wireless charging control module includes a resonant unit, a driver chip U4 and a sampling unit; The instantaneous enable drive terminal of the driver chip is connected to the instantaneous enable signal output terminal of the main control module, the pulse width modulation signal input terminal of the driver chip is connected to the pulse width modulation signal output terminal of the main control module, and the control signal output terminal of the driver chip is connected to the control signal input terminal of the resonant unit, so that the main control module controls the driver chip to execute the digital Q value detection process or the analog PING detection process. The resonant unit is used to perform wireless charging of the wireless charging device. The sampling signal output terminal of the resonant unit is connected to the signal input terminal of the sampling unit, and the signal output terminal of the sampling unit is connected to the sampling signal input terminal of the driver chip U4, so as to determine whether to wake up the wireless charging device in deep sleep mode.

7. The wake-up circuit for a wireless charging device based on dual detection according to claim 6, characterized in that, The resonant unit includes a capacitor bank consisting of capacitors C53, C55, C56, and C58 connected in parallel and a coil CL1. The control signal output terminal of the driver chip includes pins SW1 and SW2. The first end of the capacitor bank is connected to pin SW1, the second end of the capacitor bank is connected to the first end of the coil CL1, and the second end of the coil CL1 is connected to pin SW2.

8. The wake-up circuit for a wireless charging device based on dual detection according to claim 6, characterized in that, The sampling unit includes capacitors C29, C32, and C33, resistors R33, R34, and R36, and diode D5. The anode of diode D5 is connected to the sampling signal output terminal of the resonant unit, the cathode of diode D5 is connected to the first terminal of resistor R33, the second terminal of resistor R33 is connected to the first terminal of resistor R34, the second terminal of resistor R34 is connected to the first terminal of capacitor C29, the second terminal of capacitor C29 is connected to the first channel resonant detection terminal of driver chip U4, resistor R36 is connected to ground at a common node between the second terminal of resistor R33 and the first terminal of resistor R34, capacitor C33 is connected to ground at another common node between the second terminal of resistor R33 and the first terminal of resistor R34, and capacitor C32 is connected to ground at the common node between the second terminal of resistor R34 and the first terminal of capacitor C29.

9. A wireless charging device wake-up circuit based on dual detection according to claim 8, characterized in that, The sampling unit further includes resistors R29 and R30. The first end of resistor R29 is connected to the sampling signal output terminal of the resonant unit, the second end of resistor R29 is connected to the first end of resistor R30, the second end of resistor R30 is grounded, and the common node between the second end of resistor R29 and the first end of resistor R30 is connected to the second channel resonant detection terminal of the driver chip U4.

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