Electronic equipment and cooperative working method

Abstract

The invention provides electronic equipment and a cooperative working method. The electronic equipment comprises a heat dissipation device, an application processor, a driving circuit, a current detection circuit, a first piezoelectric transducer and a second piezoelectric transducer, the first piezoelectric transducer and the second piezoelectric transducer are arranged in the cavity of the heat dissipation device and used for changing airflow in the cavity in a matched mode. The application processor is respectively connected with the driving circuit and the current detection circuit; the current detection circuit is connected into a loop through which the driving circuit supplies power to the first piezoelectric transducer and the second piezoelectric transducer; and the application processor is configured to determine a cooperative resonant frequency corresponding to the first piezoelectric transducer and the second piezoelectric transducer based on the total current corresponding to each frequency acquired by the current detection circuit, and control the driving circuit to drive the first piezoelectric transducer and the second piezoelectric transducer at the cooperative resonant frequency based on the cooperative resonant frequency.

Description

An electronic device and a collaborative working method Technical Field

[0001] This disclosure relates to the field of heat dissipation technology for electronic devices, and more specifically, to an electronic device and a method for cooperating. Background Technology

[0002] There are many heat dissipation solutions for current mobile electronic devices. One approach is to use piezoelectric transducers in the heat dissipation device, utilizing the interaction between multiple piezoelectric transducers to drive airflow changes and thus dissipate heat. However, in practical applications, the heat dissipation effect of piezoelectric transducers is not very good, and the cooling effect is inconsistent. Summary of the Invention

[0003] In view of this, the present disclosure provides an electronic device and a method for collaborative operation.

[0004] The first aspect of this disclosure provides an electronic device, including a heat dissipation device, an application processor, a driving circuit, a current detection circuit, a first piezoelectric transducer, and a second piezoelectric transducer;

[0005] The first and second piezoelectric transducers are located in the cavity of the heat dissipation device to help change the airflow in the cavity; the application processor is connected to the drive circuit and the current detection circuit respectively.

[0006] The current detection circuit is connected to the circuit that supplies power to the first piezoelectric transducer and the second piezoelectric transducer by the driving circuit; the application processor is configured to: determine the coordinated resonant frequency corresponding to the first piezoelectric transducer and the second piezoelectric transducer based on the total current corresponding to each frequency obtained by the current detection circuit, and control the driving circuit to drive the first piezoelectric transducer and the second piezoelectric transducer at the coordinated resonant frequency based on the coordinated resonant frequency.

[0007] The electronic device according to an embodiment of the present disclosure further includes a phase control circuit; the phase control circuit is connected to an application processor and a driving circuit respectively; the phase control circuit is configured to:

[0008] Based on the instructions of the application processor, a second drive signal with a target phase difference is output to the drive circuit so that the drive circuit drives the first piezoelectric transducer and the second piezoelectric transducer to work together.

[0009] According to an embodiment of the present disclosure, the application processor is further configured to: control the driving circuit to output multiple first driving signals of different frequencies to the first piezoelectric transducer and the second piezoelectric transducer, so that the current detection circuit acquires the total current corresponding to each frequency; compare the multiple total currents acquired when outputting multiple first driving signals of different frequencies; and determine the frequency of the first driving signal corresponding to the total current with the largest value among the multiple total current values ​​as the coordinated resonant frequency corresponding to the first piezoelectric transducer and the second piezoelectric transducer.

[0010] According to an embodiment of the present disclosure, the electronic device includes a driving circuit comprising: a boost converter for boosting an input voltage to a preset voltage; and a high-voltage driver connected to the boost converter and a first piezoelectric transducer and a second piezoelectric transducer, for converting a DC voltage from the boost converter into a corresponding AC voltage according to a received driving signal, so as to drive the first piezoelectric transducer and the second piezoelectric transducer, wherein the driving signal includes a first driving signal and a second driving signal.

[0011] According to an embodiment of the present disclosure, the current detection circuit further includes: a detection resistor connected in series in the driving main circuit formed by the high-voltage driver, the first piezoelectric transducer, and the second piezoelectric transducer; and a differential amplifier connected across the detection resistor and connected to the application processor, wherein the differential amplifier is used to amplify the voltage difference across the detection resistor to generate a voltage signal.

[0012] According to an embodiment of the electronic device disclosed herein, an application processor includes an analog-to-digital converter (ADC). The input terminal of the ADC is connected to the output terminal of a differential amplifier, and the ADC is used to convert the voltage signal output by the differential amplifier into a digital signal. The application processor is also used to calculate the total current flowing through the first piezoelectric transducer and the second piezoelectric transducer based on the digital signal output by the ADC and the resistance value of the detection resistor.

[0013] In the electronic device according to embodiments of the present disclosure, a second drive signal having a target phase difference is sequentially delayed in time.

[0014] According to the electronic device of the present disclosure, the starting frequency of the first driving signal is lower than the lower limit of the expected frequency range of the piezoelectric transducer; the ending frequency of the first driving signal is higher than the upper limit of the expected frequency range; and the rated resonant frequencies of the first piezoelectric transducer and the second piezoelectric transducer at the operating temperature are within the frequency range of the starting frequency and the ending frequency.

[0015] A second aspect of this disclosure provides a method for coordinating the operation of a first piezoelectric transducer and a second piezoelectric transducer in an electronic device. The method includes: responding to a start command or a condition change command from the electronic device, supplying power to the first and second piezoelectric transducers and outputting multiple first drive signals of different frequencies to the first and second piezoelectric transducers to obtain the total current corresponding to each frequency; determining a coordinating resonant frequency corresponding to the first and second piezoelectric transducers based on the total current corresponding to each frequency; and driving the first and second piezoelectric transducers based on the coordinating resonant frequency to cause them to work together, thereby changing the airflow within a cavity. The first and second piezoelectric transducers are disposed within the cavity of a heat dissipation device of the electronic device.

[0016] The method according to an embodiment of this disclosure further includes, in response to a target instruction from an electronic device, determining a coordinated resonant frequency corresponding to the first piezoelectric transducer and the second piezoelectric transducer based on the total current corresponding to each frequency obtained by the current detection circuit; and driving the first piezoelectric transducer and the second piezoelectric transducer based on the coordinated resonant frequency to make the first piezoelectric transducer and the second piezoelectric transducer work together to change the airflow in the cavity, wherein the first piezoelectric transducer and the second piezoelectric transducer are disposed in the cavity of the heat dissipation device of the electronic device.

[0017] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0018] The above and other objects, features and advantages of this disclosure will become clearer from the following description of embodiments with reference to the accompanying drawings, in which:

[0019] Figure 1 schematically illustrates a structural diagram of an electronic device according to an embodiment of the present disclosure;

[0020] Figure 2 schematically illustrates a simulation diagram of a heat dissipation structure for an electronic device according to an embodiment of the present disclosure;

[0021] Figure 3 schematically illustrates a block diagram of an electronic device including a phase control circuit according to an embodiment of the present disclosure;

[0022] Figure 4 schematically illustrates a process for generating a unidirectional airflow according to an embodiment of the present disclosure;

[0023] Figure 5 schematically illustrates a complex airflow pattern according to an embodiment of the present disclosure;

[0024] Figure 6 schematically illustrates the connection diagram of the drive circuit and a plurality of piezoelectric transducers according to an embodiment of the present disclosure;

[0025] Figure 7 schematically illustrates a specific configuration diagram including a driving circuit according to an embodiment of the present disclosure;

[0026] Figure 8 schematically illustrates a specific configuration of a current detection circuit according to an embodiment of the present disclosure;

[0027] Figure 9 schematically illustrates a flowchart of a collaborative working method according to an embodiment of the present disclosure;

[0028] Figure 10 schematically illustrates a detailed flowchart of a collaborative working method according to an embodiment of the present disclosure;

[0029] Figure 11 schematically illustrates a block diagram of an electronic device suitable for implementing the described method according to an embodiment of the present disclosure. Detailed Implementation

[0030] The embodiments of the present disclosure will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the disclosure. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of the present disclosure for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concepts of the present disclosure.

[0031] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. The terms “comprising,” “including,” etc., as used herein indicate the presence of features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0032] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0033] When using expressions such as "at least one of A, B and C", they should generally be interpreted in accordance with the meaning that is commonly understood by those skilled in the art (e.g., "a system having at least one of A, B and C" should include, but is not limited to, a system having A alone, a system having B alone, a system having C alone, a system having A and B, a system having A and C, a system having B and C, and / or a system having A, B and C, etc.).

[0034] The relevant terms in the embodiments of this disclosure are explained below.

[0035] Figure 1 schematically illustrates a structural diagram of an electronic device according to an embodiment of the present disclosure.

[0036] As shown in FIG1, a second aspect of the present disclosure provides an electronic device, including a power control circuit 100, the power control circuit 100 including: an application processor 110, a drive circuit 120, a current detection circuit 130, a heat dissipation device 140, a first piezoelectric transducer 141, and a second piezoelectric transducer 142.

[0037] The application processor 110 is connected to the drive circuit 120 and the current detection circuit 130, respectively, and is used to execute control logic, including initiating frequency scanning, analyzing current data, and generating drive signals. The drive circuit 120 is connected to the application processor 110, the first piezoelectric transducer 141, and the second piezoelectric transducer 142, and is used to generate and output high-voltage AC drive signals according to the instructions of the application processor 110. The current detection circuit 130 is connected in series in the drive main circuit composed of the drive circuit 120, the first piezoelectric transducer 141, and the second piezoelectric transducer 142, and is also connected to the application processor 110, used to detect the current signal flowing through the drive main circuit in real time. The first piezoelectric transducer 141 and the second piezoelectric transducer 142 are disposed in the cavity of the heat dissipation device 140 of the electronic device and are connected to the drive circuit 120, used to generate mechanical vibration under the excitation of the drive signal, thereby changing the airflow in the cavity to achieve active heat dissipation.

[0038] The application processor 110 is configured to: control the drive circuit 120 to output multiple drive signals of different frequencies; determine the co-resonant frequency that maximizes the total current value based on the total current value fed back by the current detection circuit 130 corresponding to each drive frequency; and control the drive circuit 120 to drive the first piezoelectric transducer 141 and the second piezoelectric transducer 142 to work at the co-resonant frequency.

[0039] In the embodiments of this disclosure, the piezoelectric transducer may be made of lead zirconate titanate (PZT) material. Lead zirconate titanate material has the advantages of high electromechanical conversion efficiency, fast response speed and low power consumption, and is particularly suitable for building miniature active heat dissipation systems in thin and light electronic devices.

[0040] Specifically, the overall efficiency of multiple piezoelectric transducers is indirectly reflected by detecting the total current in the drive circuit. Since a piezoelectric transducer exhibits minimum impedance near its resonant frequency, the current flowing through it is maximum under the same drive voltage. By scanning a preset frequency range and monitoring the total current at multiple frequencies, the frequency point that maximizes the total current can be found; this is the coordinated resonant frequency of the multiple piezoelectric transducers. This method eliminates the need for complex detection circuits for each piezoelectric transducer, resulting in a simple and low-cost system structure, making it particularly suitable for space-constrained mobile electronic devices.

[0041] It should be noted that in mobile electronic devices such as smartphones, the Application Processor (AP) can execute the aforementioned frequency scanning process according to preset strategies, such as when the device activates its cooling function, when the system detects that the chip temperature exceeds a threshold, or periodically (e.g., at regular time intervals). Through this process, the application processor can quickly and automatically lock onto the optimal frequency point (i.e., the coordinated resonant frequency) for multiple piezoelectric transducers to work together under the current ambient temperature, device state, and assembly conditions. This dynamic frequency tracking mechanism ensures that the cooling system can continuously adapt to changes in internal and external conditions, thereby maintaining the heat dissipation performance at or near-optimal levels.

[0042] It should also be understood that the technical solutions described in the embodiments of this disclosure are not limited to application scenarios with two piezoelectric transducers. The heat dissipation device of an electronic device may include two, three, or more piezoelectric transducers, which can also be connected in parallel or otherwise connected to the main drive circuit. The method by which the application processor determines the cooperative resonant frequency by scanning the frequency and detecting the total current in the main drive circuit is also applicable and effective for systems composed of multiple (more than two) piezoelectric transducers. In this case, the determined cooperative resonant frequency is the operating frequency that maximizes the overall efficiency and overall drive current of the multiple piezoelectric transducers.

[0043] In the embodiments disclosed herein, by utilizing the physical characteristics of piezoelectric transducers—where electrical impedance is minimum and drive current is maximum at the resonant point—and combining a frequency scanning strategy involving current detection and processor control, a novel solution is found to address the technical challenge of fixed-frequency drive schemes failing to consistently operate at their optimal efficiency point in air-cooled systems due to individual differences and temperature variations causing resonant frequency drift among multiple piezoelectric transducers. Existing solutions suffer from unstable heat dissipation due to frequency mismatch, resulting in inconsistent performance and high energy consumption. This embodiment, however, automatically tracks and locks the cooperative resonant frequency, ensuring the piezoelectric transducers always operate at their optimal efficiency point, thereby significantly improving the performance stability and energy efficiency of the heat dissipation device and achieving continuous, reliable, and efficient heat dissipation. Furthermore, this solution is simple to implement, possesses excellent manufacturability and integrability, and provides a highly efficient, thin, and reliable heat dissipation solution for high-power mobile electronic devices.

[0044] According to embodiments of this disclosure, the application processor 110 is further specifically configured to perform the following steps to determine the coordinated resonant frequency: the control drive circuit 120 outputs multiple first drive signals of different frequencies to the first piezoelectric transducer 141 and the second piezoelectric transducer 142. During this process, the current detection circuit 130 acquires and reports the total current value corresponding to each frequency point in real time. The multiple total current values ​​acquired when outputting the multiple first drive signals of different frequencies are compared. The frequency of the first drive signal corresponding to the largest total current value among the multiple total current values ​​is determined as the coordinated resonant frequency corresponding to the first piezoelectric transducer 141 and the second piezoelectric transducer 142.

[0045] For example, the application processor 110 can control the drive frequency to start at 22kHz and increase it in fixed steps (e.g., 100Hz increments) to 24kHz, sequentially outputting a total of 21 different frequency first drive signals. Each time a frequency is switched, the current detection circuit 130 samples the total current, denoted as... , ,..., Application processor 110 compares the 21 current values ​​and finds the maximum value. Assuming the maximum current value is measured at a driving frequency of 21.3 kHz, application processor 110 determines 21.3 kHz as the current resonant frequency. Application processor 110 then controls drive circuit 120 to continuously drive the two piezoelectric transducers at a frequency of 21.3 kHz. This method achieves automated frequency search and locking, requires no manual calibration, and can adapt to changes in piezoelectric transducer parameters.

[0046] For example, Table 1 shows the operating characteristics of the heat dissipation system of this disclosure embodiment at different driving frequencies. This data is based on experimental measurements of electronic devices composed of the first, second, and third piezoelectric transducers, including the sound pressure level (decibels) generated by the electronic devices at a distance of 4 meters and the total operating current (mA) at a 3V supply voltage, as specifically shown in Table 1:

[0047] Table 1

[0048]

[0049] Data shows that changes in the driving frequency significantly affect the acoustic output (operating noise) and power consumption characteristics of the system. The system exhibits the highest current consumption around 3.0kHz and 3.3kHz, which is consistent with the electrical characteristics of the piezoelectric transducer reaching mechanical resonance and minimum impedance in this frequency band. This directly verifies the feasibility and effectiveness of the core method of locating the co-resonant frequency by detecting the peak value of the total current in the driving circuit.

[0050] In the embodiments of this disclosure, the method for determining the coordinated resonant frequency achieves automatic and rapid search and locking of the optimal operating frequency of multiple transducers by detecting the total current of the drive circuit as a single electrical parameter and utilizing the characteristic that the piezoelectric transducer has the maximum current at the resonant point. This method does not require complex impedance analysis or additional vibration sensors, has simple hardware implementation, and clear calculation logic. It effectively solves the problem of resonant frequency drift caused by individual device differences, aging, and temperature changes, ensuring that the heat dissipation system can adaptively and always operate at a high-efficiency point.

[0051] In the embodiments of this disclosure, the starting frequency of the first driving signal is lower than the lower limit of the expected frequency range of the piezoelectric transducer; the ending frequency of the first driving signal is higher than the upper limit of the expected frequency range; and the rated resonant frequencies of the first and second piezoelectric transducers at the operating temperature are within the frequency range of the starting and ending frequencies.

[0052] In the embodiments of this disclosure, by setting the scanning frequency range to be wider than the expected resonant range of the piezoelectric transducer, it is ensured that the automatic search process for the co-resonant frequency can still successfully capture the optimal operating point even when device parameters drift or ambient temperature changes. This design significantly improves the adaptability and reliability of the heat dissipation system under different operating conditions, enabling the active heat dissipation performance to be maintained stably.

[0053] Figure 2 schematically illustrates a simulation diagram of a heat dissipation structure for an electronic device according to an embodiment of the present disclosure.

[0054] The frequency range set above is based on a thorough understanding and simulation analysis of the mechanical structure of the heat dissipation system. Figure 2 schematically shows the vibration mode simulation cloud map of the heat dissipation structure (or cavity) in the electronic device represented by 1 at a certain characteristic frequency (e.g., 21,298 Hz). This cloud map quantifies the deformation amplitude and distribution of each point on the structural surface at resonance through a color gradient from green (minimum displacement) to purple (maximum displacement) represented by 2.

[0055] It should be noted that, based on this type of modal analysis, the main resonant frequency distribution range of the heat dissipation structure can be determined. In order to ensure that the frequency scan of the present invention can capture this critical high-efficiency operating point, or its drift range under the influence of temperature and manufacturing tolerances, the scan range of the first drive signal must be set wide enough, i.e., the starting frequency is lower than the lower limit of the expected resonant range, and the ending frequency is higher than its upper limit.

[0056] For example, simulations and tests show that the effective coordinated resonant frequency after coupling the heat dissipation structure and the piezoelectric transducer may be distributed between 21kHz and 23kHz, and may fluctuate upwards to approximately 21.3kHz (as shown in Figure 9) or downwards. To ensure robustness, the scan start frequency can be set to 20.5kHz and the end frequency to 23.5kHz. This ensures that the complete scan process covers the entire range regardless of where the coordinated resonant frequency falls, thereby guaranteeing that the application processor can reliably lock onto the optimal operating point, ensuring that the system always operates in a state that excites structural resonance and achieves the highest heat dissipation efficiency. This frequency range design based on structural dynamics analysis is a crucial basis for achieving efficient and reliable adaptive heat dissipation in this embodiment.

[0057] Figure 3 schematically illustrates a block diagram of an electronic device including a phase control circuit according to an embodiment of the present disclosure.

[0058] According to an embodiment of this disclosure, as shown in FIG3, the electronic device further includes a phase control circuit 150. The phase control circuit 150 is connected to the application processor 110 and the drive circuit 120, respectively. The phase control circuit 150 is configured to generate a second drive signal with a specific target phase difference based on the instruction of the application processor 110, and output it to the drive circuit 120. The drive circuit 120 drives the first piezoelectric transducer 141 and the second piezoelectric transducer 142 to work together with a preset phase difference according to the second drive signal.

[0059] In the embodiments of this disclosure, the phase control circuit 150 constitutes a signal processing and adaptation bridge between the application processor 110 and the driving circuit 120. Specifically, the driving circuit 120 is connected to the application processor 110 through the phase control circuit 150. The application processor 110 does not directly output the original driving signal for controlling the phase difference to the driving circuit 120, but instead sends an indication containing the frequency and phase control intention (e.g., target frequency and desired phase difference) to the phase control circuit 150. The application processor 110 drives the driving circuit 120 through the phase control circuit 150: the phase control circuit 150 receives the reference frequency signal and control parameters from the application processor 110, generates a second driving signal with a precise timing relationship, i.e., a specific target phase difference, based on these inputs, and outputs the second driving signal to the control input terminal of the driving circuit 120, thereby achieving indirect and precise control of the phase of the output waveform of the driving circuit 120.

[0060] Specifically, in some heat dissipation structure designs, in order to form a more effective directional airflow, enhance airflow intensity, or avoid standing wave interference caused by the mutual cancellation of vibrations of multiple piezoelectric transducers, it is necessary for the vibrations of two or more piezoelectric transducers to have a fixed phase difference in time. After determining the resonant frequency, the application processor 110 can send a control command to the phase control circuit 150 based on a preset heat dissipation mode or real-time calculation. This command includes the target phase difference to be set (e.g., 0 degrees, 90 degrees, 120 degrees, or 180 degrees). The phase control circuit 150, for example, using a programmable delay chip or through digital logic circuitry, receives the reference frequency signal (i.e., the resonant frequency) from the AP and generates two or more drive signals with a precise time delay relationship according to the target phase difference, and outputs them to the drive circuit 120.

[0061] In the embodiments disclosed herein, by introducing a programmable phase control circuit on top of automatic resonant frequency tracking, multiple piezoelectric transducers can not only operate at their most efficient frequency points, but also vibrate in unison with optimal phase relationships. This achieves active and precise control over the shape and intensity of the heat dissipation airflow.

[0062] In the embodiments of this disclosure, the second drive signal generated by the phase control circuit 150 with a target phase difference is sequentially delayed in time.

[0063] Specifically, when the phase control circuit 150 is used to drive two piezoelectric transducers, it can output a first signal and a second signal. The second signal has a preset fixed time delay relative to the first signal. The value of this time delay can be calculated based on the target phase difference and the co-resonant frequency. For example, when a 90-degree phase difference is required and the co-resonant frequency is 21.3 kHz, the corresponding time delay is approximately 11.7 microseconds. Through this timing arrangement, the mechanical vibration waveforms of the two piezoelectric transducers are precisely offset in the time dimension, thereby enabling the driving forces of the two transducers to form a more effective superposition and guiding effect during coupling. This not only enhances the directionality and intensity of the heat dissipation airflow and improves heat dissipation efficiency, but may also reduce operating noise by disrupting the in-phase superposition of sound waves at specific frequencies.

[0064] Figure 4 schematically illustrates a process for generating a unidirectional airflow according to an embodiment of the present disclosure.

[0065] According to an embodiment of this disclosure, as shown in FIG4, when the first piezoelectric transducer and the second piezoelectric transducer in this electronic device are driven to vibrate with a specific phase relationship, their movements within the heat dissipation chamber are coordinated. For example, at a certain moment, the first piezoelectric transducer deforms to compress local air to form a high-pressure zone, while the second piezoelectric transducer simultaneously deforms in the opposite direction to draw air away to form a low-pressure zone. This pressure difference, which alternates spatially and is precisely coordinated in time, jointly propels air in a specific direction to form a stable and directional airflow, thereby significantly enhancing the overall heat dissipation efficiency of this electronic device.

[0066] Figure 5 schematically illustrates a complex airflow pattern according to an embodiment of the present disclosure.

[0067] According to embodiments of this disclosure, as shown in FIG. 5, this electronic device can shape more complex airflow patterns by configuring different drive phase differences. The figure illustrates another possible cooperative operating state, where the spatial distribution of the compression and extraction zones generated by multiple piezoelectric transducers differs from that in FIG. 4, resulting in changes in airflow path, intensity, or vortex morphology. This demonstrates that by adjusting the phase relationship of each drive signal through a phase control circuit, this electronic device can actively and flexibly regulate the airflow pattern within the heat dissipation chamber to adapt to different internal heat dissipation structures or optimize heat exchange efficiency.

[0068] Figure 6 schematically illustrates the connection diagram of the drive circuit and a plurality of piezoelectric transducers according to an embodiment of the present disclosure.

[0069] According to an embodiment of this disclosure, as shown in FIG6, the driver chip in this electronic device can output multiple drive signals, each signal including a positive drive terminal and a negative drive terminal, which are respectively connected to the corresponding piezoelectric transducer. A phase control circuit (not shown separately in the figure, but can be integrated into the driver chip or used as a front-end module) is responsible for assigning a specific phase difference to these drive signals. For example, by controlling the time delay between the drive signals of each channel, the signals connected to different transducers are given a preset phase offset, thereby achieving multiple cooperative working modes as shown in FIG4 and FIG5. This connection structure is the hardware foundation for this electronic device to achieve independent control and cooperative operation of multiple transducers.

[0070] For example, Table 2 shows a set of exemplary drive timings configured for three piezoelectric transducers via a phase control circuit, which can generate coordinated vibrations in specific modes.

[0071] Table 2

[0072]

[0073] As shown in Table 2, at time T0, the first and second transducers deform upwards synchronously, while the third transducer deforms downwards, potentially creating a specific pressure distribution within the chamber. At time T2, the first transducer deforms downwards, while the second and third transducers deform upwards, resulting in a change in the pressure distribution. By cyclically cycling this drive sequence, the deformation of the three transducers alternates in time and space, effectively driving the air within the chamber to generate complex and controllable flows, such as enhancing vortices or creating a net airflow with a specific direction. This example visually illustrates that the phase control circuit, by setting different drive signal delays (phase differences), can precisely program the vibration states of multiple piezoelectric transducers, which is key to achieving programmable control of airflow patterns in this electronic device.

[0074] Figure 7 schematically illustrates a specific configuration diagram including a drive circuit according to an embodiment of the present disclosure.

[0075] According to an embodiment of this disclosure, as shown in FIG7, the driving circuit includes a boost converter 121 and a high-voltage driver 122. The boost converter 121 is used to boost the input DC voltage provided by the electronic device to a preset high voltage required to drive the piezoelectric transducer. The high-voltage driver 122 connects the boost converter and the first piezoelectric transducer. The high-voltage driver 122 is connected between the boost converter 121 and the first piezoelectric transducer 141 and the second piezoelectric transducer 142. It is used to convert the DC voltage from the boost converter 121 into an AC voltage of corresponding frequency and phase according to the driving signal received from the application processor 110 or the phase control circuit 150, so as to drive the first piezoelectric transducer 141 and the second piezoelectric transducer 142. The driving signal includes a first driving signal and a second driving signal.

[0076] In embodiments of this disclosure, the first drive signal is a reference drive signal directly generated and output by the application processor 110 for frequency scanning. A typical characteristic is that its frequency varies within a preset range (e.g., 22kHz to 24kHz) over a period of time according to a preset step size (e.g., 100Hz), aiming to explore and determine the cooperative resonant frequency that maximizes the total system current. The second drive signal is a drive signal with a specific target phase difference generated by the phase control circuit 150 based on instructions from the application processor 110. A typical characteristic is that its frequency is the determined cooperative resonant frequency and it contains multiple signals with precise phase delay relationships, used to drive multiple piezoelectric transducers to work collaboratively with optimized phase relationships.

[0077] It should be noted that the high-voltage driver 122 can handle both types of drive signals. When the system is in the frequency scanning phase, the high-voltage driver 122 receives and responds to the first drive signal from the application processor 110, outputting an AC voltage with varying frequency. When the system completes frequency locking and enables phase control, the high-voltage driver 122 receives and responds to the second drive signal from the phase control circuit 150, outputting multiple AC voltages with stable frequency and precise phase difference. This design allows the same drive hardware to be time-division multiplexed, supporting frequency tracking and phase optimization workflows.

[0078] For example, the boost converter 121 can be implemented using a DC-DC boost chip. Its input voltage can be taken from the output voltage of the battery in the mobile device. By configuring its peripheral feedback circuit, the output voltage of the boost converter 121 can be stabilized at a preset high voltage value to meet the voltage amplitude requirements for driving the piezoelectric transducer. The high-voltage driver 122 can be implemented using a full-bridge driver chip. The power supply terminal of the high-voltage driver 122 is connected to the high voltage output of the boost converter 121. Its signal input terminal is used to receive logic level drive signals from the application processor 110 or the phase control circuit 150.

[0079] Furthermore, the high-voltage driver 122 internally includes an H-bridge power conversion circuit. Based on the logic signal sequence received at its input pins, the high-voltage driver 122 controls the on / off states of the various switching devices in the internal H-bridge, thereby converting the DC voltage from the boost converter 121 into an AC square wave voltage with circuit ground as the reference point, and applying it to the piezoelectric transducer. The frequency and phase relationship of the final output AC drive voltage are determined by the drive signal input to the high-voltage driver 122.

[0080] In the embodiments of this disclosure, a combination of a boost converter and a high-voltage driver provides the high voltage and precise AC waveform required for driving the piezoelectric transducer. The drive circuit is compact and efficient, capable of handling different drive signals for frequency scanning and phase optimization, ensuring that the system can automatically track the optimal resonant frequency and achieve precise phase coordination among multiple transducers. This enables high-performance, adaptive active cooling within the limited space of a mobile device.

[0081] Figure 8 schematically illustrates a specific configuration of a current detection circuit according to an embodiment of the present disclosure.

[0082] According to an embodiment of this disclosure, as shown in FIG8, the current detection circuit 130 includes a detection resistor 131 and a differential amplifier 132. The detection resistor 131 is connected in series in the drive main circuit formed by the output terminal of the high-voltage driver 122, the first piezoelectric transducer 141, and the second piezoelectric transducer 142. The two differential input terminals of the differential amplifier 132 are respectively connected to the two ends of the detection resistor 131, and its output terminal is connected to the application processor 110.

[0083] Specifically, the sensing resistor 131 is used to introduce a known resistance value into the drive main circuit. When the drive current flows through this resistor, a small voltage difference proportional to the current magnitude is generated across it. Since this voltage difference signal is weak and differential, it is susceptible to common-mode noise, therefore signal conditioning is required via a differential amplifier 132. The differential amplifier 132, for example, can be a dedicated differential amplifier chip, used to amplify the voltage difference with high precision while effectively suppressing common-mode interference, outputting a single-ended voltage signal with appropriate amplitude and a high signal-to-noise ratio to the application processor 110.

[0084] For example, a low-resistance, high-precision sensing resistor 131 can be used. Assuming that at a certain driving frequency, the total current flowing through the piezoelectric transducer is 200 mA and the sensing resistor 131 is 0.1 ohms, the voltage difference across it will be approximately 20 mV. If the gain of the differential amplifier 132 is configured to 10, its output voltage signal will be approximately 200 mV. This signal is then sent to the analog-to-digital converter inside the application processor 110 for digitization. In this way, the system can accurately acquire the analog voltage signal reflecting the change in the total current of the driving circuit, thus providing a crucial data foundation for subsequent frequency analysis and determination of the resonant point.

[0085] In the embodiments of this disclosure, the combination of a sensing resistor and a differential amplifier enables high-precision, low-cost detection of the total current in the drive circuit. This replaces expensive Hall sensors and is suitable for space-constrained mobile devices.

[0086] According to an embodiment of the present disclosure, as shown in FIG8, the application processor 110 includes an analog-to-digital converter 111. The input terminal of the analog-to-digital converter 111 is connected to the output terminal of the differential amplifier 132. The analog-to-digital converter 111 is used to convert the analog voltage signal output by the differential amplifier 132 into a corresponding digital signal.

[0087] Specifically, the voltage signal output by the differential amplifier 132 is a continuous analog signal. The analog-to-digital converter 111 samples and quantizes this analog signal at a preset sampling rate, converting it into a digital code that can be directly processed by the microprocessor. The value of this digital code directly reflects the level of the output voltage of the differential amplifier 132.

[0088] Furthermore, the application processor 110 is also used to calculate the total current flowing through the first piezoelectric transducer 141 and the second piezoelectric transducer 142 based on the digital signal output by the analog-to-digital converter 111 and the known resistance value of the sensing resistor 131. For example, the application processor 110 first deduces the actual voltage value output by the differential amplifier based on the digital signal output by the analog-to-digital converter, combined with its reference voltage and resolution; then, by dividing this voltage value by the gain of the differential amplifier, the true voltage difference across the sensing resistor can be obtained; finally, according to Ohm's law, the voltage difference is divided by the resistance value of the sensing resistor to obtain the real-time total current value.

[0089] In the embodiments of this disclosure, the analog-to-digital converter is integrated into the application processor and directly connected to the differential amplifier, forming a highly efficient digital acquisition path. This integrated design simplifies the circuit, reduces costs, and enables the processor to quickly acquire accurate digital current values, providing a reliable data foundation for frequency scanning and resonance determination, and is the core of intelligent heat dissipation control. Practical applications require matching the converter parameters according to the signal characteristics.

[0090] The electronic devices (such as smartphones, tablets, etc.) in this disclosure include a system for active heat dissipation using piezoelectric transducers. This system drives two or more piezoelectric transducers to vibrate to change the airflow in the heat dissipation chamber, thereby dissipating heat from high-heat-generating components (such as processor chips) inside the device.

[0091] In some scenarios, the aforementioned heat dissipation system can be triggered to start or adjust its working state when specific conditions are detected inside the device, so as to achieve dynamic and efficient heat dissipation management.

[0092] The cooperative operation method in the embodiments of this disclosure is used to control the cooperative operation of multiple piezoelectric transducers in an electronic device to make them operate at the optimal efficiency point. The method includes: responding to a trigger command, supplying power to a first piezoelectric transducer and a second piezoelectric transducer in the electronic device, and outputting multiple drive signals of different frequencies to the piezoelectric transducers to obtain the total current of the drive circuit corresponding to each drive frequency; determining the cooperative resonant frequency corresponding to the first piezoelectric transducer and the second piezoelectric transducer based on the obtained total current corresponding to each frequency; and driving the first piezoelectric transducer and the second piezoelectric transducer based on the determined cooperative resonant frequency to make them work in coordination and efficiently change the airflow in the heat dissipation chamber.

[0093] The trigger command can be generated based on various application scenarios. For example, it can be generated when an electronic device is detected to be powered on, a user starts a high-performance application (such as a game), the system detects that the chip temperature exceeds a preset threshold, or a significant change in the device's heat dissipation environment is detected (such as being removed from a pocket or the casing temperature rising). This command aims to initiate a search and locking process for the optimal cooperative operating frequency, ensuring that the heat dissipation system can immediately adapt to the new operating conditions and operate with optimal efficiency. The process of determining the cooperative resonant frequency is essentially a combination of changing the drive signal frequency and real-time current feedback. By comparing the current response at different frequencies, the operating frequency point that minimizes the overall system power consumption and maximizes efficiency is found.

[0094] Figure 9 schematically illustrates a flowchart of a collaborative working method according to an embodiment of the present disclosure.

[0095] As shown in Figure 9, the collaborative work method includes at least steps S910 to S920.

[0096] Operation S910, in response to the target command of the electronic device, determines the coordinated resonant frequency corresponding to the first piezoelectric transducer and the second piezoelectric transducer based on the total current corresponding to each frequency obtained by the current detection circuit.

[0097] In the embodiments of this disclosure, the control drive circuit sequentially outputs multiple drive signals of different frequencies to the first and second piezoelectric transducers in a scanning manner. The current detection circuit acquires and records in real time the total current value flowing through the two piezoelectric transducers when each drive signal of a certain frequency is output. By comparing the recorded multiple total current values, the drive signal frequency corresponding to the largest total current value is determined as the resonant frequency.

[0098] Operator S920 drives the first and second piezoelectric transducers based on the resonant frequency, so that the first and second piezoelectric transducers work together to change the airflow in the chamber.

[0099] In embodiments of this disclosure, a phase control circuit generates and outputs two drive signals with a predetermined phase difference to drive the first piezoelectric transducer and the second piezoelectric transducer, respectively. The predetermined phase difference is configured to cause the vibrations of the first and second piezoelectric transducers to synthesize a directional airflow within the cavity.

[0100] In the embodiments of this disclosure, the target instruction can be an instruction generated by activating the heat dissipation device; the target instruction can also be an instruction generated in response to changes in operating conditions. These changes in operating conditions can refer to the working environment of the heat dissipation device. If the piezoelectric transducer is a highly sensitive device, it has high requirements for its operating environment. Changes in the operating environment may affect its conversion efficiency. For example, the operation or inactivity of certain internal devices affects the piezoelectric transducer differently; exemplified examples include turning a speaker on and off, or a motor on and off. Therefore, the instruction generated in response to changes in operating conditions can be an instruction generated by turning certain devices on and off.

[0101] In the embodiments of this disclosure, after receiving a target command (such as a power-on or temperature rise command), an automatic coordinated resonant frequency search process is executed. Based on the searched coordinated resonant frequency, a phase coordinated drive process is executed to generate the airflow required for heat dissipation efficiently and stably.

[0102] It should be noted that the embodiments of the temperature control method section are similar to those of the aforementioned temperature control system section, and the technical effects achieved are also similar. For specific details, please refer to the embodiments of the aforementioned electronic equipment section, which will not be repeated here.

[0103] Figure 10 schematically illustrates a detailed flowchart of a collaborative working method according to an embodiment of the present disclosure.

[0104] As shown in Figure 10, the collaborative working method provided in this embodiment of the present disclosure specifically includes the following processes: Initiation in response to the heat dissipation requirements of the electronic device; Powering the entire system to bring each circuit module of the electronic device into operation.

[0105] The frequency scanning phase begins. The application processor outputs a drive signal at a preset starting frequency (e.g., 22kHz) and gradually increases the frequency of the drive signal in fixed step increments (e.g., 100Hz), scanning within a preset frequency range (e.g., 22kHz to 24kHz). Simultaneously, the drive circuit is activated, and the high-voltage driver operates according to the drive signal output by the application processor, converting the DC high voltage into an AC drive voltage of the corresponding frequency.

[0106] During the scanning process, the current detection circuit synchronously performs current sampling operations: when the driving frequency is the starting frequency (22kHz), the current detection circuit samples the total current of the driving loop to obtain the first current sample value; after the application processor increases the driving frequency by a step (e.g., to 22.1kHz), the current detection circuit samples again to obtain the second current sample value; and so on, the application processor continues to increase the driving frequency by step until the upper limit of the scanning range (e.g., 24kHz) is reached. The current detection circuit synchronously samples at each frequency point to obtain a series of current values ​​corresponding to each scanning frequency point.

[0107] The frequency determination phase begins. The application processor compares all acquired current values, identifies the maximum value, and determines the driving frequency corresponding to the maximum current value as the resonant frequency of the first and second piezoelectric transducers under the current conditions.

[0108] Furthermore, the application processor also performs a security check: determining whether the determined resonant frequency is within a preset normal operating frequency range (e.g., 18kHz to 28kHz). If the resonant frequency is within the preset normal operating frequency range, the piezoelectric transducer is determined to be operating normally, and the application processor then controls the drive circuit to continuously drive the piezoelectric transducer at the resonant frequency, thereby achieving optimal heat dissipation.

[0109] If the resonant frequency is determined to be outside the preset normal operating frequency range (e.g., below 18kHz or above 28kHz), the application processor determines that the piezoelectric transducer may be in an abnormal state (e.g., exposed to water, severely clogged with dust, or experiencing a mechanical failure). In this case, the application processor will trigger a protection mechanism, such as controlling the drive circuit to shut off the output to stop driving, and issuing an abnormality prompt to the user through the user interface (e.g., screen display, indicator lights, or sound), prompting the user to perform maintenance (e.g., drying, dust removal). After completing the frequency determination, the process ends. The application processor can then control the drive circuit to continuously drive the piezoelectric transducer at the determined resonant frequency, thereby achieving optimized heat dissipation.

[0110] Figure 11 schematically illustrates a block diagram of an electronic device suitable for implementing the described method according to an embodiment of the present disclosure.

[0111] The electronic device shown in Figure 11 is merely an example and should not be construed as limiting the functionality and scope of the embodiments of this disclosure. As shown in Figure 11, the electronic device 1100 according to an embodiment of this disclosure includes a processor 1101, which can perform various appropriate actions and processes according to a program stored in read-only memory (ROM) 1102 or a program loaded from storage portion 1108 into random access memory (RAM) 1103. The processor 1101 may include, for example, a general-purpose microprocessor (e.g., a CPU), an instruction set processor and / or an associated chipset and / or a special-purpose microprocessor (e.g., an application-specific integrated circuit (ASIC)), etc. The processor 1101 may also include onboard memory configured for caching purposes. The processor 1101 may include a single processing unit or multiple processing units configured to perform different actions of the method flow according to an embodiment of this disclosure.

[0112] RAM 1103 stores various programs and data required for the operation of electronic device 1100. Processor 1101, ROM 1102, and RAM 1103 are interconnected via bus 1104. Processor 1101 performs various operations of the method flow according to embodiments of the present disclosure by executing programs in ROM 1102 and / or RAM 1103. It should be noted that programs may also be stored in one or more memories other than ROM 1102 and RAM 1103. Processor 1101 may also perform various operations of the method flow according to embodiments of the present disclosure by executing programs stored in one or more memories.

[0113] According to embodiments of this disclosure, the electronic device 1100 may further include an input / output (I / O) interface 1105, which is also connected to a bus 1104. The electronic device 1100 may also include one or more of the following components connected to the input / output (I / O) interface 1105: an input section 1106 including a keyboard, mouse, etc.; an output section 1107 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 1108 including a hard disk, etc.; and a communication section 1109 including a network interface card such as a LAN card, modem, etc. The communication section 1109 performs communication processing via a network such as the Internet. A drive 1110 is also connected to the input / output (I / O) interface 1105 as needed. A removable medium 1111, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., is installed on the drive 1110 as needed so that computer programs read from it can be installed into the storage section 1108 as needed.

[0114] According to embodiments of this disclosure, the method flow according to embodiments of this disclosure can be implemented as a computer software program. For example, embodiments of this disclosure include a computer program product comprising a computer program carried on a computer-readable storage medium, the computer program containing program code configured to perform the methods shown in the flowchart. In such embodiments, the computer program can be downloaded and installed from a network via communication section 1109, and / or installed from removable medium 1111. When the computer program is executed by processor 1101, it performs the functions defined in the system of embodiments of this disclosure. According to embodiments of this disclosure, the systems, devices, apparatuses, modules, units, etc., described above can be implemented by computer program modules.

[0115] This disclosure also provides a computer-readable storage medium, which may be included in the device / apparatus / system described in the above embodiments; or it may exist independently and not assembled into the device / apparatus / system. The computer-readable storage medium carries one or more programs that, when executed, implement the method according to the embodiments of this disclosure.

[0116] According to embodiments of this disclosure, the computer-readable storage medium can be a non-volatile computer-readable storage medium. Examples include, but are not limited to: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this disclosure, the computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0117] For example, according to embodiments of this disclosure, a computer-readable storage medium may include one or more memories other than the ROM 1102 and / or RAM 1103 described above and / or ROM 1102 and RAM 1103.

[0118] Embodiments of this disclosure also include a computer program product comprising a computer program containing program code configured to perform the methods provided in the embodiments of this disclosure. When the computer program product is run on an electronic device, the program code is configured to enable the electronic device to implement the remote sensing image detection method based on a deep neural network provided in the embodiments of this disclosure.

[0119] When the computer program is executed by the processor 1101, it performs the functions defined in the system / apparatus of this disclosure embodiments. According to embodiments of this disclosure, the systems, apparatuses, modules, units, etc., described above can be implemented by computer program modules.

[0120] In one embodiment, the computer program may rely on a tangible storage medium such as an optical storage device or a magnetic storage device. In another embodiment, the computer program may also be transmitted and distributed in the form of signals over a network medium, and may be downloaded and installed via the communication section 1109, and / or installed from the removable medium 1111. The program code contained in the computer program can be transmitted using any suitable network medium, including but not limited to: wireless, wired, etc., or any suitable combination thereof.

[0121] According to embodiments of this disclosure, program code configured to execute the computer programs provided in embodiments of this disclosure can be written in any combination of one or more programming languages. Specifically, these computational programs can be implemented using high-level procedural and / or object-oriented programming languages, and / or assembly / machine languages. Programming languages ​​include, but are not limited to, languages ​​such as Java, C++, Python, "C", or similar programming languages. The program code can execute entirely on a user's computing device, partially on a user's device, partially on a remote computing device, or entirely on a remote computing device or server. In cases involving remote computing devices, the remote computing device can be connected to the user's computing device via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0122] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions configured to perform a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, may be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions. Those skilled in the art will understand that the features described in the various embodiments of the present disclosure can be combined and / or combined in various ways, even if such combinations are not explicitly described in the present disclosure. In particular, the features described in the various embodiments of this disclosure may be combined and / or combined in various ways without departing from the spirit and teachings of this disclosure. All such combinations and / or combinations fall within the scope of this disclosure.

[0123] The embodiments of this disclosure have been described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of this disclosure. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of this disclosure, and all such substitutions and modifications should fall within the scope of this disclosure.

Claims

1. An electronic device, comprising: Heat dissipation device, application processor, drive circuit, current detection circuit, first piezoelectric transducer, second piezoelectric transducer; The first piezoelectric transducer and the second piezoelectric transducer are disposed in the cavity of the heat dissipation device to cooperate in changing the airflow in the cavity; the application processor is connected to the driving circuit and the current detection circuit respectively; the current detection circuit is connected to the circuit that supplies power to the first piezoelectric transducer and the second piezoelectric transducer by the driving circuit; the application processor is configured to: determine the coordinated resonant frequency corresponding to the first piezoelectric transducer and the second piezoelectric transducer based on the total current corresponding to each frequency obtained by the current detection circuit, and control the driving circuit to drive the first piezoelectric transducer and the second piezoelectric transducer at the coordinated resonant frequency based on the coordinated resonant frequency.

2. The electronic device according to claim 1, further comprising: A phase control circuit; the phase control circuit is connected to the application processor and the drive circuit respectively. The phase control circuit is configured to output a second drive signal with a target phase difference to the drive circuit based on an instruction from the application processor, so that the drive circuit drives the first piezoelectric transducer and the second piezoelectric transducer to work together.

3. The electronic device according to claim 1, wherein the application processor is further configured to: control the driving circuit to output a plurality of first driving signals of different frequencies to the first piezoelectric transducer and the second piezoelectric transducer, so that the current detection circuit acquires the total current corresponding to each frequency; compare the plurality of total currents acquired when outputting the plurality of first driving signals of different frequencies; and determine the frequency of the first driving signal corresponding to the total current with the largest value among the plurality of total current values ​​as the coordinated resonant frequency corresponding to the first piezoelectric transducer and the second piezoelectric transducer.

4. The electronic device according to claim 1, wherein the driving circuit comprises: A boost converter is used to boost the input voltage to a preset voltage. A high-voltage driver, connected to the boost converter and the first piezoelectric transducer and the second piezoelectric transducer, is used to convert the DC voltage from the boost converter into a corresponding AC voltage according to the received drive signal, so as to drive the first piezoelectric transducer and the second piezoelectric transducer. The drive signal includes the first drive signal and the second drive signal.

5. The electronic device according to claim 1, wherein the current detection circuit further comprises: The detection resistor is connected in series in the drive main circuit formed by the high-voltage driver, the first piezoelectric transducer, and the second piezoelectric transducer; A differential amplifier is connected across the sensing resistor and to the application processor. The differential amplifier is used to amplify the voltage difference across the sensing resistor to generate a voltage signal.

6. The electronic device according to claim 5, wherein the application processor includes an analog-to-digital converter; the input terminal of the analog-to-digital converter is connected to the output terminal of the differential amplifier, and the analog-to-digital converter is used to convert the voltage signal output by the differential amplifier into a digital signal. The application processor is further used to calculate the total current flowing through the first piezoelectric transducer and the second piezoelectric transducer based on the digital signal output by the analog-to-digital converter and the resistance value of the detection resistor.

7. The electronic device according to claim 1, wherein the second drive signal having the target phase difference is sequentially delayed in time.

8. The electronic device according to claim 3, wherein the starting frequency of the first driving signal is lower than the lower limit of the expected frequency range of the piezoelectric transducer; the ending frequency of the first driving signal is higher than the upper limit of the expected frequency range; and the rated resonant frequencies of the first piezoelectric transducer and the second piezoelectric transducer at the operating temperature are within the frequency range of the starting frequency and the ending frequency.

9. A collaborative work method, the method comprising: In response to the target command of the electronic device, based on the total current corresponding to each frequency obtained by the current detection circuit, a coordinated resonant frequency corresponding to the first piezoelectric transducer and the second piezoelectric transducer is determined; based on the coordinated resonant frequency, the first piezoelectric transducer and the second piezoelectric transducer are driven to work together to change the airflow in the cavity, wherein the first piezoelectric transducer and the second piezoelectric transducer are disposed in the cavity of the heat dissipation device of the electronic device.

10. The method according to claim 9, wherein the target instruction is an instruction generated by activating the heat dissipation device; the target instruction is an instruction generated in response to a change in operating conditions.

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