Electronic device and control method

Abstract

The present application provides an electronic device and a control method for controlling a linear resonant driver, and includes a signal generator, a driver, a delay device, a sensor, and a digital signal processor. The signal generator can generate a digital signal. The driver can drive the linear resonant driver according to the digital signal. The delay device can delay the digital signal by a predetermined time to generate an estimated potential signal. The sensor can detect a current passing through the linear resonant driver to generate a sensed current signal. The digital signal processor can control a resonance frequency or a gain value of the signal generator according to the estimated potential signal and the sensed current signal. The present application can achieve an electronic device providing a relatively high stability, not affected by various variations of the linear resonant driver, controlling the linear resonant driver and improving its operating performance.

Description

Technical Field

[0001] This invention relates to an electronic device, and more particularly to an electronic device and control method for controlling a linear resonant actuator (LRA). Background Technology

[0002] Linear resonant actuators (LRAs) can provide vibration feedback to the user. However, due to the very large Q value of LRAs, their operating performance can easily deteriorate if the operating frequency deviates from their center resonant frequency. Furthermore, the center resonant frequency of a LRA can also shift due to factors such as climate, humidity, and aging. Therefore, a novel solution is necessary to overcome the limitations of previous technologies. Summary of the Invention

[0003] In a preferred embodiment, the present invention provides an electronic device for controlling a linear resonant driver, comprising: a signal generator for generating a digital signal; a driver for driving the linear resonant driver according to the digital signal; a delay unit for delaying the digital signal for a predetermined time to generate an estimated potential signal; a sensor for detecting a current through the linear resonant driver to generate a sensing current signal; and a digital signal processor for controlling a resonant frequency or a gain value of the signal generator according to the estimated potential signal and the sensing current signal.

[0004] In some embodiments, the digital signal processor further detects a first phase with respect to the estimated potential signal and a second phase with respect to the sensing current signal.

[0005] In some embodiments, the digital signal processor obtains a phase difference by subtracting the second phase from the first phase.

[0006] In some embodiments, the digital signal processor further adjusts the resonant frequency of the signal generator according to the phase difference, such that the resonant frequency of the signal generator approaches a center resonant frequency of the linear resonant driver.

[0007] In some embodiments, if the phase difference is less than 0, the digital signal processor will reduce the resonant frequency of the signal generator.

[0008] In some embodiments, if the phase difference is greater than 0, the digital signal processor will increase the resonant frequency of the signal generator.

[0009] In some embodiments, if the phase difference is equal to 0, the digital signal processor will maintain the resonant frequency of the signal generator.

[0010] In some embodiments, the digital signal processor includes an electromotive force module and a gain controller.

[0011] In some embodiments, the electromotive force module determines an induced electromotive force of the linear resonant driver based on the digital signal, the estimated potential signal, and the sensing current signal.

[0012] In some embodiments, the gain controller adjusts the gain value of the signal generator based on the induced electromotive force of the linear resonant driver.

[0013] In another preferred embodiment, the present invention provides a control method for controlling a linear resonant driver, comprising the following steps: generating a digital signal by means of a signal generator; driving the linear resonant driver according to the digital signal; delaying the digital signal for a predetermined time to generate an estimated potential signal; detecting a current through the linear resonant driver to generate a sensing current signal; and controlling a resonant frequency or a gain value of the signal generator according to the estimated potential signal and the sensing current signal.

[0014] In some embodiments, the control method further includes: detecting a first phase of the estimated potential signal and a second phase of the sensing current signal.

[0015] In some embodiments, the control method further includes obtaining a phase difference by subtracting the second phase from the first phase.

[0016] In some embodiments, the control method further includes: adjusting the resonant frequency of the signal generator according to the phase difference, such that the resonant frequency of the signal generator approaches a center resonant frequency of the linear resonant driver.

[0017] In some embodiments, the control method further includes reducing the resonant frequency of the signal generator if the phase difference is less than 0.

[0018] In some embodiments, the control method further includes: if the phase difference is greater than 0, increasing the resonant frequency of the signal generator.

[0019] In some embodiments, the control method further includes maintaining the resonant frequency of the signal generator if the phase difference is equal to 0.

[0020] In some embodiments, the control method further includes determining an induced electromotive force of the linear resonant driver based on the digital signal, the estimated potential signal, and the sensing current signal.

[0021] In some embodiments, the control method further includes adjusting the gain value of the signal generator based on the induced electromotive force of the linear resonant driver.

[0022] In another preferred embodiment, the present invention provides an electronic device for controlling a linear resonant driver, comprising: a signal generator for generating a digital signal; a mixer for generating a mixed signal based on the digital signal and a navigation signal; a driver for driving the linear resonant driver based on the mixed signal; a sensor for detecting a current through the linear resonant driver to generate a sensing current signal; and a digital signal processor including a low-pass filter, wherein the low-pass filter processes the sensing current signal to generate a low-frequency signal, and the digital signal processor further controls a gain value of the signal generator based on the low-frequency signal.

[0023] In some embodiments, the digital signal processor further includes a temperature estimator and a gain controller.

[0024] In some embodiments, the temperature estimator determines a current temperature of the linear resonant driver based on the low-frequency signal.

[0025] In some embodiments, the gain controller adjusts the gain value of the signal generator based on the current temperature of the linear resonant driver.

[0026] In some embodiments, if the current temperature of the linear resonant driver is higher than a critical temperature, the gain controller will reduce the gain value of the signal generator.

[0027] In some embodiments, if the current temperature of the linear resonant driver is below or equal to the critical temperature, the gain controller will maintain the gain value of the signal generator.

[0028] In another preferred embodiment, the present invention provides a control method for controlling a linear resonant driver, comprising the following steps: generating a digital signal using a signal generator; generating a mixing signal based on the digital signal and a navigation signal; driving the linear resonant driver based on the mixing signal; detecting a current through the linear resonant driver to generate a sensing current signal; processing the sensing current signal using a low-pass filter to generate a low-frequency signal; and controlling a gain value of the signal generator based on the low-frequency signal.

[0029] In some embodiments, the control method further includes determining a current temperature of the linear resonant driver based on the low-frequency signal.

[0030] In some embodiments, the control method further includes adjusting the gain value of the signal generator based on the current temperature of the linear resonant driver.

[0031] In some embodiments, the control method further includes reducing the gain value of the signal generator if the current temperature of the linear resonant driver is higher than a critical temperature.

[0032] In some embodiments, the control method further includes maintaining the gain value of the signal generator if the current temperature of the linear resonant driver is lower than or equal to the critical temperature. Attached Figure Description

[0033] Figure 1 This is a schematic diagram showing an electronic device according to an embodiment of the present invention.

[0034] Figure 2 This is a graph showing the relationship between the resonant frequency and the phase difference according to an embodiment of the present invention.

[0035] Figure 3 This is a graph showing the relationship between the resonant frequency and time according to an embodiment of the present invention.

[0036] Figure 4 This is a schematic diagram showing an electronic device according to an embodiment of the present invention.

[0037] Figure 5 This is a schematic diagram showing an electronic device according to an embodiment of the present invention.

[0038] Figure 6 This is a flowchart illustrating a control method according to an embodiment of the present invention.

[0039] Figure 7 This is a flowchart illustrating a control method according to an embodiment of the present invention.

[0040] Icon labels:

[0041] 100, 400, 500: Electronic devices;

[0042] 110: Signal generator;

[0043] 120: Driver;

[0044] 130: Delay unit;

[0045] 140: Sensor;

[0046] 150, 450, 550: Digital Signal Processors;

[0047] 190: Linear resonant driver;

[0048] 452: Electromotive force module;

[0049] 454, 554: Gain controllers;

[0050] 530: Mixer;

[0051] 551: Low-pass filter;

[0052] 553: Temperature estimator;

[0053] F: The resonant frequency of the signal generator;

[0054] G: Gain value of the signal generator;

[0055] I(s): Current;

[0056] S610, S620, S630, S640, S650, S710, S720, S730, S740, S750, S760: Steps;

[0057] SD: Digital signal;

[0058] SE: Mixing signal;

[0059] SF: Low-frequency signal;

[0060] SI: Sensing current signal;

[0061] SP: Navigation signal;

[0062] SV: Estimated potential signal;

[0063] TA: Lead time;

[0064] TC: Current temperature;

[0065] TH: Critical temperature;

[0066] V(s): Potential difference;

[0067] Vemf(s): Induced electromotive force;

[0068] θ1: First phase;

[0069] θ2: Second phase;

[0070] τ: a predetermined time;

[0071] ω0: The center resonant frequency of the linear resonant driver;

[0072] ΔF: Step level;

[0073] Δθ: Phase difference. Detailed Implementation

[0074] To make the objectives, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below in conjunction with the accompanying drawings for detailed explanation.

[0075] Certain terms are used in this specification and the claims to refer to specific devices. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same device. This specification and the claims do not distinguish devices by differences in name, but by differences in function. The terms "comprising" and "including" used throughout this specification and the claims are open-ended and should be interpreted as "including but not limited to". The term "generally" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and achieve the basic technical effect within a certain margin of error. Furthermore, the term "coupled" in this specification includes any direct and indirect electrical connection means. Therefore, if a first device is described as coupled to a second device, it means that the first device can be directly electrically connected to the second device, or indirectly electrically connected to the second device via other devices or connection means.

[0076] Figure 1 This is a schematic diagram showing an electronic device 100 according to an embodiment of the present invention. The electronic device 100 can be applied to a mobile device, such as a smartphone or a tablet computer. The electronic device 100 can be used to control a linear resonant actuator (LRA) 190, which is not part of the electronic device 100. Figure 1 As shown, the electronic device 100 includes: a signal generator 110, a driver 120, a delay unit 130, a sensor 140, and a digital signal processor (DSP) 150. It should be noted that, although not shown in... Figure 1 In addition, the electronic device 100 may include other components, such as a power supply module, a touch module, a speaker, or (and) a housing, but is not limited thereto.

[0077] In general, signal generator 110 generates a digital signal SD. Driver 120 drives linear resonant driver 190 based on digital signal SD. Delay unit 130 delays digital signal SD by a predetermined time τ to generate an estimated potential signal SV. Sensor 140 detects a current I(s) passing through linear resonant driver 190 to generate a sensed current signal SI. Digital signal processor 150 controls a resonant frequency F of signal generator 110 based on estimated potential signal SV and sensed current signal SI.

[0078] The delay unit 130 is used to simulate the delay caused by the driver 120, wherein the predetermined time τ of the delay unit 130 can be set according to the operating characteristics of the driver 120 and the linear resonant driver 190. For example, the predetermined time τ can be calibrated before the electronic device 100 leaves the factory. In some embodiments, the estimated potential signal SV corresponds to a potential difference V(s) between the two ends of the linear resonant driver 190, and the sensed current signal SI corresponds to the current I(s) through the linear resonant driver 190.

[0079] In some embodiments, the impedance model of the linear resonant driver 190 may be as described by the following equation (1):

[0080]

[0081] Where "Z(s)" represents the impedance value of the linear resonant driver 190, "V(s)" represents the potential difference of the linear resonant driver 190, "I(s)" represents the current of the linear resonant driver 190, Re represents the DC impedance, "ω0" represents the center resonant frequency of the linear resonant driver 190, and "Q" represents the impedance of the linear resonant driver 190. TS "Q" represents a total quality factor. MS "" represents a mechanical quality factor, while "s" represents the variable of the Laplace transform.

[0082] In some embodiments, the digital signal processor 150 can detect a first phase θ1 with respect to the estimated potential signal SV and a second phase θ2 with respect to the sensing current signal SI. Then, the digital signal processor 150 can obtain a phase difference Δθ (i.e., Δθ = θ1 - θ2) by subtracting the second phase θ2 from the first phase θ1. For example, the phase difference Δθ can correspond to the phase of the impedance value Z(s) of the linear resonant driver 190. Finally, the digital signal processor 150 can further adjust the resonant frequency F of the signal generator 110 based on the phase difference Δθ, such that the resonant frequency F of the signal generator 110 approaches the center resonant frequency ω0 of the linear resonant driver 190.

[0083] Figure 2 This is a graph showing the relationship between the resonant frequency F and the phase difference Δθ according to an embodiment of the present invention. Based on equation (1) and... Figure 2 According to the measurement results, if the resonant frequency F of the signal generator 110 is greater than the center resonant frequency ω0 of the linear resonant driver 190, the phase difference Δθ will be less than 0; if the resonant frequency F of the signal generator 110 is less than the center resonant frequency ω0 of the linear resonant driver 190, the phase difference Δθ will be greater than 0; and if the resonant frequency F of the signal generator 110 is exactly equal to the center resonant frequency ω0 of the linear resonant driver 190, the phase difference Δθ will be exactly equal to 0.

[0084] In some embodiments, the digital signal processor 150 may adjust the resonant frequency F of the signal generator 110 in such a manner that the resonant frequency F eventually approaches the center resonant frequency ω0 of the linear resonant driver 190. First, the digital signal processor 150 may obtain a phase difference Δθ based on the estimated potential signal SV and the sensed current signal SI. If the phase difference Δθ is greater than 0, the digital signal processor 150 will increase the resonant frequency F of the signal generator 110. Conversely, if the phase difference Δθ is less than 0, the digital signal processor 150 will decrease the resonant frequency F of the signal generator 110. The digital signal processor 150 may continuously adjust the resonant frequency F of the signal generator 110 until it detects that the phase difference Δθ is exactly equal to 0. At this point, the digital signal processor 150 will maintain the resonant frequency F of the signal generator 110 at a fixed value.

[0085] Figure 3 This is a graph showing the relationship between the resonant frequency F and time according to an embodiment of the present invention. Figure 3Based on the measurement results, initially, the resonant frequency F of the signal generator 110 may be lower than the center resonant frequency ω0 of the linear resonant driver 190, so the phase difference Δθ may be greater than 0. Therefore, the digital signal processor 150 can continuously increase the resonant frequency F of the signal generator 110 until the phase difference Δθ achieves zero-crossing (e.g., the phase difference Δθ changes from positive to negative, or from negative to positive). Then, the aforementioned zero-crossing phenomenon may occur several more times to ensure that the phase difference Δθ is close to 0 again. In some embodiments, if the phase difference Δθ is greater than a critical phase (e.g., 0.5 degrees or 1 degree, but not limited to this), the digital signal processor 150 can quickly adjust the resonant frequency F of the signal generator 110 by using a relatively large step ΔF; conversely, if the phase difference Δθ is less than or equal to the aforementioned critical phase, the digital signal processor 150 can slowly adjust the resonant frequency F of the signal generator 110 by using a relatively small step ΔF. In other embodiments, the digital signal processor 150 may rapidly adjust the resonant frequency F of the signal generator 110 by using a relatively large step size ΔF only within a lead time TA. Conversely, outside the lead time TA, the digital signal processor 150 may slowly adjust the resonant frequency F of the signal generator 110 by using a relatively small step size ΔF.

[0086] Under this design, the electronic device 100 can ensure that the resonant frequency F of the signal generator 110 is equal to the center resonant frequency ω0 of the linear resonant driver 190 based on the estimated potential signal SV and the sensing current signal SI, thereby optimizing the operating performance of the linear resonant driver 190. The following embodiments will describe other configurations and functions of the electronic device 100. It must be understood that these figures and descriptions are merely illustrative and not intended to limit the scope of the invention.

[0087] Figure 4 This is a schematic diagram showing an electronic device 400 according to an embodiment of the present invention. Figure 4 and Figure 1 Similar. Figure 4 In one embodiment, the electronic device 400 includes: a signal generator 110, a driver 120, a delay unit 130, a sensor 140, and a digital signal processor 450.

[0088] In general, signal generator 110 generates a digital signal SD. Driver 120 drives linear resonant driver 190 based on digital signal SD. Delay unit 130 delays digital signal SD by a predetermined time τ to generate an estimated potential signal SV, which corresponds to a potential difference V(s) between the two ends of linear resonant driver 190. Sensor 140 detects a current I(s) through linear resonant driver 190 to generate a sensing current signal SI. Digital signal processor 450 controls a gain value G of signal generator 110 based on estimated potential signal SV and sensing current signal SI.

[0089] In some embodiments, the digital signal processor 450 includes an electromotive force module 452 and a gain controller 454. Specifically, the electromotive force module 452 determines an induced electromotive force (EMF) Vemf(s) of the linear resonant driver 190 based on the digital signal SD, the estimated potential signal SV, and the sensed current signal SI. Then, the gain controller 454 adjusts the gain value G of the signal generator 110 based on the induced EMF Vemf(s) of the linear resonant driver 190.

[0090] In some embodiments, the induced electromotive force Vemf(s) of the linear resonant driver 190 may be as described by the following equation (2):

[0091] Vemf(s)=V(s)-I(s)·Re……………………(2)

[0092] Where “Vemf(s)” represents the induced electromotive force of the linear resonant driver 190, “V(s)” represents the potential difference of the linear resonant driver 190, “I(s)” represents the current of the linear resonant driver 190, Re represents the DC impedance, and “s” represents the variable of the Laplace transition.

[0093] It must be understood that the induced electromotive force Vemf(s) of the linear resonant driver 190 is directly proportional to the moving speed of the linear resonant driver 190. For example, by differentiating the induced electromotive force Vemf(s), the acceleration of the linear resonant driver 190 can be obtained. Under this design, the electronic device 400 can predict the vibration behavior of the linear resonant driver 190 based on the induced electromotive force Vemf(s), thereby optimizing the gain value G of the signal generator 110.

[0094] Figure 5 This is a schematic diagram showing an electronic device 500 according to an embodiment of the present invention. Figure 5 and Figure 1 Similar. Figure 5 In one embodiment, the electronic device 500 includes: a signal generator 110, a driver 120, a mixer 530, a sensor 140, and a digital signal processor 550, wherein the digital signal processor 550 includes at least a low-pass filter (LPF) 551.

[0095] In general, signal generator 110 generates a digital signal SD. Mixer 530 generates a mixed signal SE based on the digital signal SD and a pilot signal SP. For example, the pilot signal SP may be a low-frequency small signal, which may originate from a pilot signal generator (not shown). Driver 120 drives linear resonant driver 190 based on the mixed signal SE. Sensor 140 detects a current I(s) passing through linear resonant driver 190 to generate a sensed current signal SI. Low-pass filter 551 processes the sensed current signal SI to generate a low-frequency signal SF, which may correspond to the aforementioned pilot signal SP. Digital signal processor 550 further controls a gain value G of signal generator 110 based on the low-frequency signal SF.

[0096] In some embodiments, the digital signal processor 550 further includes a temperature estimator 553 and a gain controller 554. Specifically, the temperature estimator 553 determines a current temperature TC of the linear resonant driver 190 based on the low-frequency signal SF. Then, the gain controller 554 adjusts the gain value G of the signal generator 110 based on the current temperature TC of the linear resonant driver 190. For example, if the current temperature TC of the linear resonant driver 190 is higher than a critical temperature TH, the gain controller 554 can reduce the gain value G of the signal generator 110; conversely, if the current temperature TC of the linear resonant driver 190 is lower than or equal to the critical temperature TH, the gain controller 554 can maintain the gain value G of the signal generator 110 at a fixed value.

[0097] It must be understood that if the current temperature TC of the linear resonant driver 190 is too high, it may negatively affect the operating performance of the linear resonant driver 190. To overcome this drawback, the electronic device 500 can optimize the gain value G of the signal generator 110 using a negative feedback mechanism based on the current temperature TC of the linear resonant driver 190.

[0098] Figure 6This is a flowchart illustrating a control method according to an embodiment of the present invention. The aforementioned control method includes the following steps: In step S610, a digital signal is generated by a signal generator. In step S620, a linear resonant driver is driven according to the digital signal. In step S630, the digital signal is delayed by a predetermined time to generate an estimated potential signal. In step S640, a current through the linear resonant driver is detected to generate a sensing current signal. In step S650, a resonant frequency or a gain value of the signal generator is controlled according to the estimated potential signal and the sensing current signal. It must be understood that the above steps do not need to be performed sequentially, but... Figures 1-4 Each feature of the embodiments can be applied to Figure 6 Among the control methods.

[0099] Figure 7 This is a flowchart illustrating a control method according to an embodiment of the present invention. The aforementioned control method includes the following steps: In step S710, a digital signal is generated by a signal generator. In step S720, a mixing signal is generated based on the digital signal and a navigation signal. In step S730, a linear resonant driver is driven based on the mixing signal. In step S740, a current through the linear resonant driver is detected to generate a sensing current signal. In step S750, the sensing current signal is processed by a low-pass filter to generate a low-frequency signal. In step S760, a gain value of the signal generator is controlled based on the low-frequency signal. It must be understood that the above steps do not need to be performed sequentially, but... Figure 5 Each feature of the embodiments can be applied to Figure 7 Among the control methods.

[0100] This invention proposes a novel electronic device for controlling a linear resonant driver and improving its operational performance. Based on actual measurements, the electronic device using the aforementioned design provides considerably high stability and is unaffected by variations in the linear resonant driver, making it well-suited for various mobile communication systems.

[0101] It is worth noting that the potential, current, resistance, inductance, capacitance, and other device parameters mentioned above are not limiting conditions of this invention. Designers can adjust these settings according to different needs. The electronic device and control method of this invention are not limited to... Figures 1-7 The state illustrated. This invention may include only... Figures 1-7 Any one or more features of any one or more embodiments of the invention. In other words, not all of the illustrated features need to be implemented simultaneously in the electronic device and control method of the present invention.

[0102] The method, or a specific form or part thereof, of the present invention may exist in the form of program code. The program code may be contained in physical media, such as floppy disks, optical discs, hard disks, or any other machine-readable (e.g., computer-readable) storage media, or may be a computer program product, not limited to an external form. When the program code is loaded and executed by a machine, such as a computer, that machine becomes an apparatus for participating in the present invention. The program code may also be transmitted via some transmission medium, such as wires or cables, optical fibers, or any transmission method. When the program code is received, loaded, and executed by a machine, such as a computer, that machine becomes an apparatus for participating in the present invention. When implemented in a general-purpose processing unit, the program code, in conjunction with the processing unit, provides a unique apparatus that operates similarly to application-specific logic circuitry.

[0103] The ordinal numbers in this specification and the claims, such as "first", "second", "third", etc., are not sequential in any way; they are only used to distinguish between two different devices with the same name.

[0104] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the scope of the invention. Any person skilled in the art can make some modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the appended claims.

Claims

1. An electronic device, characterized in that, For controlling a linear resonant driver, and includes: A signal generator produces a digital signal; A driver that drives the linear resonant driver based on the digital signal; A delay unit delays the digital signal by a predetermined time to generate an estimated potential signal, wherein the estimated potential signal corresponds to a potential difference between the two ends of the linear resonant driver; A sensor detects a current passing through the linear resonant driver to generate a sensing current signal; and A digital signal processor controls a resonant frequency or a gain value of the signal generator based on the estimated potential signal and the sensing current signal; The digital signal processor further detects a first phase of the estimated potential signal and a second phase of the sensing current signal; The digital signal processor further obtains a phase difference by subtracting the second phase from the first phase; If the phase difference is greater than a critical phase, the digital signal processor can quickly adjust the resonant frequency of the signal generator by using a relatively large step size. If the phase difference is less than or equal to the critical phase, the digital signal processor can slowly adjust the resonant frequency of the signal generator by using relatively small steps.

2. The electronic device as claimed in claim 1, characterized in that, The digital signal processor further adjusts the resonant frequency of the signal generator based on the phase difference, so that the resonant frequency of the signal generator approaches the center resonant frequency of the linear resonant driver.

3. The electronic device as claimed in claim 1, characterized in that, If the phase difference is less than 0, the digital signal processor will reduce the resonant frequency of the signal generator.

4. The electronic device as claimed in claim 1, characterized in that, If the phase difference is greater than 0, the digital signal processor will increase the resonant frequency of the signal generator.

5. The electronic device as claimed in claim 1, characterized in that, If the phase difference is equal to 0, the digital signal processor will maintain the resonant frequency of the signal generator.

6. The electronic device as claimed in claim 1, characterized in that, The digital signal processor includes an electromotive force module and a gain controller.

7. The electronic device as claimed in claim 6, characterized in that, The electromotive force module determines an induced electromotive force of the linear resonant driver based on the digital signal, the estimated potential signal, and the sensing current signal.

8. The electronic device as claimed in claim 7, characterized in that, The gain controller adjusts the gain value of the signal generator based on the induced electromotive force of the linear resonant driver.

9. A control method, characterized in that, This is used to control a linear resonant driver and includes the following steps: A digital signal is generated using a signal generator; The linear resonant driver is driven based on the digital signal; The digital signal is delayed by a predetermined time to generate an estimated potential signal, wherein the estimated potential signal corresponds to a potential difference between the two ends of the linear resonant driver; A current passing through the linear resonant driver is detected to generate a sensing current signal; The estimated potential signal and the sensing current signal are used to control a resonant frequency or a gain value of the signal generator. Detect a first phase of the estimated potential signal and a second phase of the sensing current signal; A phase difference is obtained by subtracting the second phase from the first phase. If the phase difference is greater than a critical phase, the resonant frequency of the signal generator is rapidly adjusted by using a relatively large step size; and If the phase difference is less than or equal to the critical phase, the resonant frequency of the signal generator is slowly adjusted by using relatively small steps.

10. The control method as described in claim 9, characterized in that, Including: The resonant frequency of the signal generator is adjusted according to the phase difference so that the resonant frequency of the signal generator approaches the center resonant frequency of the linear resonant driver.

11. The control method as described in claim 9, characterized in that, Including: If the phase difference is less than 0, then the resonant frequency of the signal generator is reduced.

12. The control method as described in claim 9, characterized in that, Including: If the phase difference is greater than 0, then the resonant frequency of the signal generator is increased.

13. The control method as described in claim 9, characterized in that, Including: If the phase difference is equal to 0, then the resonant frequency of the signal generator is maintained.

14. The control method as described in claim 9, characterized in that, Including: The induced electromotive force of the linear resonant driver is determined based on the digital signal, the estimated potential signal, and the sensing current signal.

15. The control method as described in claim 14, characterized in that, Including: The gain value of the signal generator is adjusted according to the induced electromotive force of the linear resonant driver.

16. An electronic device, characterized in that, For controlling a linear resonant driver, and includes: A signal generator produces a digital signal; A mixer that generates a mixed signal based on the digital signal and a navigation signal; A driver that drives the linear resonant driver according to the mixing signal; A sensor detects a current passing through the linear resonant driver to generate a sensing current signal; and A digital signal processor includes a low-pass filter, wherein the low-pass filter processes the sensing current signal to generate a low-frequency signal, and the digital signal processor further controls a gain value of the signal generator based on the low-frequency signal. The digital signal processor further includes a temperature estimator and a gain controller; The temperature estimator determines a current temperature of the linear resonant driver based on the low-frequency signal. If the current temperature of the linear resonant driver is higher than a critical temperature, the gain controller will reduce the gain value of the signal generator. If the current temperature of the linear resonant driver is lower than or equal to the critical temperature, the gain controller will maintain the gain value of the signal generator.

17. The electronic device as claimed in claim 16, characterized in that, The gain controller adjusts the gain value of the signal generator based on the current temperature of the linear resonant driver.

18. A control method, characterized in that, This is used to control a linear resonant driver and includes the following steps: A digital signal is generated using a signal generator; A mixing signal is generated based on the digital signal and a navigation signal; The linear resonant driver is driven based on the mixing signal; A current passing through the linear resonant driver is detected to generate a sensing current signal; The sensing current signal is processed by a low-pass filter to generate a low-frequency signal; The gain value of the signal generator is controlled based on the low-frequency signal. The current temperature of the linear resonant driver is determined based on the low-frequency signal. If the current temperature of the linear resonant driver is higher than a critical temperature, then the gain value of the signal generator is reduced. as well as If the current temperature of the linear resonant driver is lower than or equal to the critical temperature, the gain value of the signal generator is maintained.

19. The control method as described in claim 18, characterized in that, Including: The gain value of the signal generator is adjusted according to the current temperature of the linear resonant driver.

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