Sound production device using speaker heat dissipation and control method thereof

Abstract

The present disclosure is a sound generating device, comprising: a speaker box comprising a sound outlet; a speaker arranged in the speaker box; a temperature detector for detecting the temperature of the sound generating device and generating a feedback signal; a central processing unit pre-stored with a preset audio signal, wherein when the central processing unit determines that the speaker is in a standby state and the temperature of the sound generating device exceeds a temperature threshold value through the feedback signal, the central processing unit outputs the preset audio signal, wherein the preset audio signal is a periodic signal and each period comprises a positive half-waveform and a negative half-waveform which are alternately switched; and a signal amplifier connected between the central processing unit and the speaker for amplifying the preset audio signal and providing it to the speaker, so that the diaphragm of the speaker vibrates according to the amplified preset audio signal.

Description

Technical Field

[0001] This disclosure pertains to the field of sound-generating devices, and particularly relates to a sound-generating device that utilizes a loudspeaker for heat dissipation and a suitable control method thereof. Background Technology

[0002] The advancements in camera and wireless communication speeds have led to the popularity of high-definition video recording, 3D mobile games, and 5G communication in sound-generating devices (or portable electronic devices), such as mobile phones. As a result, these devices have become increasingly burdened, making it crucial to improve heat dissipation.

[0003] Most current sound-generating devices employ passive cooling, which uses materials with high thermal conductivity to transfer heat from the heat source to the surface of the device via conduction, and then to the ambient air via convection, thereby reducing the temperature of the heat source. However, the amount of heat that passive cooling can handle is limited by the size of the device's surface area. With the trend towards miniaturization and high functionality, the effectiveness of passive cooling cannot be significantly increased, thus passive cooling often becomes a design bottleneck for sound-generating devices.

[0004] Therefore, developing a sound-generating device that utilizes speaker heat dissipation to improve upon the existing technology and its applicable control method is an urgent need at present. Summary of the Invention

[0005] This disclosure provides a sound-generating device that utilizes a loudspeaker for heat dissipation and a suitable control method thereof, thereby solving the problem that traditional sound-generating devices, which rely on passive heat dissipation, cannot improve their effectiveness due to limitations imposed by the size of the surface area of ​​the sound-generating device.

[0006] To achieve the aforementioned objectives, a broader embodiment of this disclosure provides a sound-generating device, comprising a speaker box, a loudspeaker, a temperature detector, a central processing unit (CPU), and a signal amplifier. The speaker box includes a sound outlet. The loudspeaker is disposed within the speaker box. The temperature detector detects the temperature of the sound-generating device and generates a feedback signal. The CPU stores a preset audio signal and determines whether the temperature of the sound-generating device exceeds a temperature threshold based on the feedback signal. When the CPU determines that the loudspeaker is in standby mode and the temperature of the sound-generating device exceeds the temperature threshold, the CPU outputs the preset audio signal, which is a periodic signal, and each cycle includes alternating positive and negative half-cycle waveforms. The signal amplifier is connected between the CPU and the loudspeaker to amplify the preset audio signal and provide it to the loudspeaker.

[0007] To achieve the aforementioned objectives, another broader embodiment of this disclosure provides a control method applied to a sound-generating device, wherein the sound-generating device includes a speaker box, a loudspeaker, a temperature detector, a central processing unit (CPU), and a signal amplifier. The control method includes: detecting the temperature of the sound-generating device using the temperature detector and generating a feedback signal; the CPU continuously determining whether the loudspeaker is in a standby state and determining whether the temperature of the sound-generating device exceeds a temperature threshold value based on the feedback signal from the temperature detector; when the CPU determines that the loudspeaker is in a standby state and the temperature of the sound-generating device exceeds the temperature threshold value, the CPU outputs a preset audio signal, wherein the preset audio signal is a periodic signal and each cycle includes alternating positive half-cycle waveforms and negative half-cycle waveforms; and amplifying the preset audio signal using the signal amplifier and providing it to the loudspeaker. Attached Figure Description

[0008] Figure 1 This is a system block diagram of a preferred embodiment of the sound-generating device of this disclosure;

[0009] Figure 2 A cross-sectional schematic diagram of a portion of the sound-generating device in a first preferred embodiment;

[0010] Figure 3 for Figure 1 The diagram shows the waveform in the time domain of the amplified preset audio signal received by the speaker from the preset audio signal amplifier.

[0011] Figure 4 for Figure 1 The diagram shows the relationship between the maximum oscillation distance of the amplified preset audio signal received by the loudspeaker from the preset audio signal amplifier at each frequency.

[0012] Figure 5 A cross-sectional schematic diagram of a portion of the sound-generating device in a second preferred embodiment;

[0013] Figure 6 The preferred embodiments of this disclosure are applicable to Figure 1 The diagram shows a control method flowchart for the sound-generating device.

[0014] Explanation of reference numerals in the attached figures:

[0015] 1, 1a: Sound-generating device

[0016] 2: Speaker

[0017] 3: Temperature detector

[0018] 4: Central Processing Unit

[0019] 5: Signal Amplifier

[0020] 6: Speaker box

[0021] 7: Heat source

[0022] 60: Sound outlet

[0023] Y: Voltage value of the sine wave

[0024] F1: The frequency at which the negative half-cycle waveform of the preset audio signal has the maximum oscillation distance of the positive voltage.

[0025] F2: The frequency at which the positive half-cycle waveform of the preset audio signal has the maximum oscillation distance of the positive voltage.

[0026] 61: First shell

[0027] 62: Second shell

[0028] 63: First heat conduction medium

[0029] 64: Cavity

[0030] 610: Extension

[0031] 65: Second heat transfer medium

[0032] E: Maximum swing distance Detailed Implementation

[0033] Some typical embodiments embodying the features and advantages of this disclosure will be described in detail in the following description. It should be understood that this disclosure can be varied in different implementations without departing from the scope of this disclosure, and the descriptions and illustrations therein are for illustrative purposes only and not intended to limit this disclosure.

[0034] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 ,in Figure 1 This is a system block diagram of a sound-generating device according to a preferred embodiment of the present disclosure. Figure 2 This is a cross-sectional schematic diagram of a portion of the sound-generating device in a first preferred embodiment. Figure 3 for Figure 1 The diagram shown illustrates the waveform in the time domain of the amplified preset audio signal received by the speaker from the preset audio signal amplifier. Figure 4 for Figure 1 The diagram shows the relationship between the maximum oscillation distance of the amplified preset audio signal received by the loudspeaker from the preset audio signal amplifier at various frequencies. Figures 1 to 4As shown, the sound-generating device 1 disclosed herein can be, but is not limited to, portable electronic devices such as mobile phones or laptops. The sound-generating device 1 includes a speaker 2, a temperature detector 3, a central processing unit 4, a signal amplifier 5, and a speaker box 6. The speaker 2 is located inside the speaker box 6, wherein the speaker box 6 includes a sound outlet 60, and the sound-generating device 1 can play a main audio that is audible to the human ear through the speaker 2.

[0035] Temperature detector 3 is used to detect the temperature of sound-generating device 1 and generate a corresponding feedback signal. In some embodiments, temperature detector 3 may be built into the host of sound-generating device 1, which may also include speaker 2, central processing unit 4, signal amplifier 5 and speaker box 6, etc. However, temperature detector 3 may also be constructed by external circuitry and set independently of the host in sound-generating device 1.

[0036] The central processing unit 4 stores a preset audio signal. Furthermore, the central processing unit 4 receives a feedback signal output from the temperature detector 3 to determine whether the temperature of the sound-emitting device 1 exceeds a temperature threshold and whether the speaker 2 is in a standby state. In this embodiment, the aforementioned standby state means that the speaker 2 does not need to play the main audio. When the speaker 2 is in a standby state (i.e., does not need to play the main audio) and the central processing unit 4 determines that the temperature of the sound-emitting device 1 exceeds the temperature threshold, the central processing unit 4 outputs a preset audio signal. This preset audio signal is a periodic signal, and each cycle contains alternating positive half-cycle waveforms (e.g.,...). Figure 3 The time domain waveforms shown are from 0 degrees to 180 degrees and the negative half-cycle waveforms (e.g., ...). Figure 3 The preset audio signal is set to a frequency that is inaudible to humans (i.e., the frequency of the preset audio signal is below the threshold frequency that the human ear can hear, such as 20Hz). In addition, when the central processing unit 4 determines that the speaker 2 is not in standby mode (i.e., the main audio needs to be played) or the temperature of the sound-emitting device 1 does not exceed the temperature threshold, the central processing unit 4 stops outputting the preset audio signal.

[0037] In some embodiments, the preset audio signal pre-stored in the central processing unit 4 may be generated by a microcontroller unit (MCU) or a digital signal processor (DSP) (neither shown) and pre-stored in the central processing unit 4, but this is not a limitation. In other embodiments, the preset audio signal may be generated by music editing software and pre-stored in the central processing unit 4. Furthermore, the preset audio signal may be a sine wave, and the following description will exemplify the preset audio signal as a sine wave, where the expression for a sine wave is Y = Asinθ, Y is the voltage value of the sine wave, A is the rated voltage received by the speaker 2, and θ is the angle, ranging from 0 degrees to 360 degrees.

[0038] Signal amplifier 5 is connected between central processing unit 4 and speaker 2. It amplifies the preset audio signal output by central processing unit 4 and provides it to speaker 2, causing the diaphragm (not shown) of speaker 2 to vibrate accordingly based on the amplified preset audio signal. The waveform and characteristics of the amplified preset audio signal output by signal amplifier 5 are consistent with the preset audio signal output by central processing unit 4, differing only in that the amplitude is increased. Figure 3 and Figure 4 The waveforms of the amplified preset audio signal are displayed in both the time and frequency domains, respectively. Figure 3 and Figure 4 As shown, the amplified preset audio signal is a periodic signal, and each cycle includes alternating positive and negative half-cycle waveforms (the preset audio signal output by the central processing unit 4 is the same, and will not be described again). During the positive half-cycle of the amplified preset audio signal, the vibration of the diaphragm of the speaker 2 causes the hot air caused by the heat source 7 to be discharged from the sound outlet 60 outside the sound-generating device 1. During the negative half-cycle of the preset audio signal, the vibration of the diaphragm of the speaker 2 draws the cold air outside the sound-generating device 1 into the sound-generating device 1 through the sound outlet 60. Thus, when the speaker 2 is in standby mode and the sound-generating device 1 has a heat dissipation requirement, the sound-generating device 1 of this disclosure can drive the speaker 2 to operate according to the positive and negative half-cycle waveforms of the preset audio signal, so that the sound-generating device 1 can actively dissipate heat without the user being able to hear it. Therefore, the heat dissipation of the sound-generating device 1 of this disclosure is not limited by the size of the surface area and can increase the heat dissipation effect.

[0039] In the above embodiment, the vibration of the diaphragm of the speaker 2 can drive the air in the speaker box 6 to flow towards the sound outlet 60. Therefore, when the amplified preset audio signal is a positive half-cycle waveform, the vibration direction of the diaphragm of the speaker 2 is towards the direction close to the sound outlet 60 to expel the hot air in the sound generating device 1. When the amplified preset audio signal is a negative half-cycle waveform, the vibration direction of the diaphragm of the speaker 2 is away from the sound outlet 60 to draw in cold air into the sound generating device 1.

[0040] To improve the heat dissipation effect of the sound-generating device 1, in some embodiments, such as Figure 3 and Figure 4As shown, in a preset audio signal consisting of a positive half-cycle and a negative half-cycle, the frequency of the positive half-cycle is faster than that of the negative half-cycle. In other words, the duration of the positive half-cycle is shorter than that of the negative half-cycle. Therefore, the diaphragm of speaker 2 vibrates in a fast-push, slow-pull manner. In the fast-push mode, hot air inside the sound-generating device 1 is expelled as quickly as possible; in the slow-pull mode, cold air outside the sound-generating device 1 is drawn into it in the largest possible quantity. Correspondingly... Figure 3 and Figure 4 It can be seen that, in Figure 3 The angles of 90 degrees and 270 degrees in the time domain shown correspond to the maximum excursion distances of the diaphragm of speaker 2 at different frequencies for positive and negative voltages, respectively. And from... Figure 4 It is known that the maximum swing distance varies at different frequencies depending on the characteristics of the diaphragm material. When the negative half-cycle waveform of the preset audio signal is at F1 Hz, the swing distance is smaller compared to the operation at F2 Hz, but because the diaphragm swings more slowly, it can still increase the amount of cold air drawn in through the sound outlet 60. In other words, when the positive half-cycle waveform of the preset audio signal is at F2 Hz, the diaphragm swings faster compared to the operation at F1 Hz, allowing the hot air inside the speaker box 6 to be expelled more quickly. Figure 4 The "E" in the figure represents the maximum oscillation distance of the diaphragm at a preset audio signal of F2Hz.

[0041] Please refer to the following: Figure 2 In this embodiment, the sound-generating device 1 further includes a first housing 61, a second housing 62, and a first heat-conducting medium 63. The first housing 61 is made of a thermally conductive metal material, such as copper or aluminum, and the second housing 62 is made of plastic. The first housing 61 and the second housing 62 are joined together to define a speaker box 6 with a cavity 64. Furthermore, at least a portion of the first housing 61 and the second housing 62 is separated from each other to form the sound outlet 60 of the speaker box 6. The first housing 61 also includes an extension 610 that protrudes from the outside of the speaker box 6. The speaker 2 is located inside the cavity 64 and mounted on the second housing 62. Moreover, the first heat-conducting medium 63 is located between the heat source 7 and the extension 610 of the first housing 61, and is in contact with the heat source 7 and the extension 610. It can be, but is not limited to, thermal paste, thermally conductive film, or solder. Figure 2 As shown, the heat energy generated by the heat source 7 can be conducted to the speaker box 6 through the first heat conduction medium 63 and the first housing 61, so that the cold air in the speaker box 6 becomes hot air. Then, the hot air in the speaker box 6 is discharged by the vibration of the diaphragm of the speaker 2, and the cold air is drawn into the speaker box 6 to achieve the purpose of heat dissipation.

[0042] Please see Figure 5This is a cross-sectional schematic diagram of a portion of the sound-generating device in a second preferred embodiment. The structure of the sound-generating device 1a in this embodiment is similar to that of... Figure 1 and Figure 2 The sound-generating device 1 shown is therefore labeled with the same symbol to represent components with similar structures and characteristics, and will not be described again. The sound-generating device 1a in this embodiment, in addition to including the following... Figure 2 In addition to the first housing 61, the second housing 62, and the first heat transfer medium 63 shown, it also includes a second heat transfer medium 65, and the first housing 61 does not have the following characteristics: Figure 2 The extension 610 shown further illustrates this. The first heat-conducting medium 63 only contacts the heat source 7 and not the first housing 61, while the second heat-conducting medium 65 is located between the first heat-conducting medium 63 and a portion of the first housing 61, and is in contact with both the first heat-conducting medium 63 and the first housing 61. Furthermore, the first heat-conducting medium 63 and the second heat-conducting medium 65 can be, but are not limited to, different heat-conducting media such as thermal paste, thermal conductive film, or solder. Figure 5 As shown, the heat energy generated by the heat source 7 can be conducted to the speaker box 6 through the first heat conduction medium 63, the second heat conduction medium 65 and the first shell 61, so that the cold air in the speaker box 6 becomes hot air. Then, the hot air in the speaker box 6 is discharged by the vibration of the diaphragm of the speaker 2, and the cold air is drawn into the speaker box 6 to achieve the purpose of heat dissipation.

[0043] In some embodiments, the first housing 61 may utilize the plasticity of metal to form at least one heat dissipation fin (not shown) to increase the heat dissipation area and improve the heat dissipation efficiency of the sound-generating device 1a.

[0044] Please see Figure 6 and cooperate Figures 1 to 4 ,in Figure 6 The preferred embodiments of this disclosure are applicable to Figure 1 The diagram shows a control method flowchart for the sound-generating device. Figure 6 As shown, the control method of the sound-generating device disclosed herein includes the following steps.

[0045] Step S1: The temperature of the sound-generating device 1 is detected by the temperature detector 3 and a feedback signal is generated.

[0046] In step S2, the central processing unit 4 continuously determines whether the speaker 2 is in standby mode (i.e., whether it does not need to play the main audio) and determines whether the temperature of the sound-emitting device 1 exceeds the temperature threshold value through the feedback signal from the temperature detector 3.

[0047] Step S3: When the central processing unit 4 determines that the speaker 2 is in standby mode and the temperature of the sound-emitting device 1 exceeds the temperature threshold, the central processing unit 4 outputs a preset audio signal.

[0048] Step S4: The preset audio signal is amplified by the signal amplifier 5 and provided to the speaker 2.

[0049] In some embodiments, the control method of the sound-generating device disclosed herein may further include step S5, in which the diaphragm of the loudspeaker 2 vibrates in accordance with the amplified preset audio signal, so that during the positive half-cycle of the preset audio signal, hot air inside the sound-generating device 1 is discharged from the sound outlet 60 of the loudspeaker box 6 through the diaphragm, and during the negative half-cycle of the preset audio signal, cold air outside the sound-generating device 1 is drawn into the sound-generating device 1 from the sound outlet 60 through the diaphragm. Of course, in some embodiments, after step S5 is executed, step S1 may be re-executed.

[0050] In summary, this disclosure provides a sound-generating device that utilizes a speaker for heat dissipation and a suitable control method thereof. When the speaker is in standby mode and has a heat dissipation requirement, the sound-generating device drives the speaker to operate according to the positive and negative half-cycle waveforms of a preset audio signal, so that the sound-generating device actively dissipates heat without the user being able to hear it. Therefore, the heat dissipation of the sound-generating device of this disclosure is not limited by the size of the surface area and can increase the heat dissipation effect.

Claims

1. A sound-generating device, comprising: A speaker box, which includes a sound outlet; A loudspeaker is installed inside the speaker box; A temperature detector is used to detect the temperature of the sound-generating device and generate a feedback signal; A central processing unit (CPU) stores a preset audio signal and uses this feedback signal to determine whether the temperature of the sound-emitting device exceeds a temperature threshold. When the speaker is in standby mode and the temperature of the sound-emitting device exceeds the temperature threshold, the CPU outputs the preset audio signal. The preset audio signal is a periodic signal, and each cycle includes alternating positive and negative half-cycle waveforms. A signal amplifier, connected between the central processing unit and the speaker, amplifies the preset audio signal and provides it to the speaker. The frequency of the positive half-cycle waveform is faster than the frequency of the negative half-cycle waveform. The diaphragm of the loudspeaker vibrates in accordance with the amplified preset audio signal, so that when the preset audio signal is in the positive half-cycle, the diaphragm discharges the hot air inside the sound-generating device from the sound outlet outside the sound-generating device, and when the preset audio signal is in the negative half-cycle, the diaphragm draws the cold air outside the sound-generating device into the sound-generating device from the sound outlet inside the sound-generating device.

2. The sound-generating device as claimed in claim 1, wherein the preset audio signal is an audio signal that is inaudible to humans.

3. The sound-generating device as claimed in claim 1, wherein the preset audio signal is a sine wave.

4. The sound-generating device as claimed in claim 1, wherein when the amplified preset audio signal is the positive half-cycle waveform, the vibration direction of the diaphragm is toward the direction close to the sound outlet, and when the amplified preset audio signal is the negative half-cycle waveform, the vibration direction of the diaphragm is away from the sound outlet.

5. The sound-generating device as claimed in claim 1, wherein the sound-generating device further comprises a first housing, a second housing, and a first heat-conducting medium, the first housing being made of a metal heat-conducting material, the second housing being made of plastic, and the first housing and the second housing being assembled together to define the speaker box, and the first housing further comprising an extension protruding from the outside of the speaker box, the first heat-conducting medium being located between a heat source and the extension of the first housing, and in contact with the heat source and the extension.

6. The sound-generating device as claimed in claim 1, wherein the sound-generating device further comprises a first housing, a second housing, a first thermally conductive medium and a second thermally conductive medium, the first housing being made of a thermally conductive metal material, the second housing being made of plastic, and the first housing and the second housing being assembled together to define the speaker box, the first thermally conductive medium being in contact with a heat source, and the second thermally conductive medium being located between the first thermally conductive medium and a portion of the first housing, and in contact with the first thermally conductive medium and the first housing.

7. The sound-generating device as claimed in claim 6, wherein the first heat-conducting medium and the second heat-conducting medium are respectively composed of different heat-conducting media.

8. A control method applied to a sound-generating device, wherein the sound-generating device includes a speaker box, a loudspeaker, a temperature detector, a central processing unit, and a signal amplifier, the control method comprising: The temperature detector is used to detect the temperature of the sound-generating device and generate a feedback signal; The central processing unit continuously determines whether the speaker is in a standby state and determines whether the temperature of the sound-emitting device exceeds a temperature threshold value through the feedback signal from the temperature detector. When the central processing unit determines that the speaker is in standby mode and the temperature of the sound-emitting device exceeds the temperature threshold, the central processing unit outputs a preset audio signal, wherein the preset audio signal is a periodic signal and each cycle includes an alternating positive half-cycle waveform and a negative half-cycle waveform; and The preset audio signal is amplified by the signal amplifier and then provided to the speaker. The frequency of the positive half-cycle waveform is faster than the frequency of the negative half-cycle waveform. The diaphragm of the loudspeaker vibrates in accordance with the amplified preset audio signal, so that when the preset audio signal is in the positive half-cycle, the diaphragm discharges the hot air inside the sound-generating device from the sound outlet of the speaker box, and when the preset audio signal is in the negative half-cycle, the diaphragm draws the cold air outside the sound-generating device into the sound-generating device from the sound outlet.

9. The control method as described in claim 8, wherein the preset audio signal is an audio signal that is inaudible to humans.

10. The control method as described in claim 8, wherein the preset audio signal is a sine wave.

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