TWM647183U - Heat dissipation pad with noise reduction mechanism - Google Patents

Abstract

The new model is a cooling pad with a noise reduction mechanism, which includes a base body, a cooling fan and a noise reduction module. The base body includes a holding seat and a holding chamber. The holding seat is provided with a ventilation hole communicating with the holding chamber; heat dissipation The fan is arranged in the accommodation chamber and is configured corresponding to the ventilation hole; the noise reduction module is arranged in the accommodation chamber and includes an active noise reduction controller, a speaker and a microphone electrically connected to the active noise reduction controller; wherein the microphone After receiving the noise emitted by the cooling fan, through the operation and communication of the active noise reduction controller, a noise reduction sound that can offset the noise of the cooling fan is emitted from the speaker. This can overcome the disturbing noise generated by the cooling fan during operation.

Description

Cooling pad with noise reduction mechanism

The present invention relates to the technical field of a cooling pad, in particular to a cooling pad with a noise reduction mechanism.

Computers have become an indispensable product for modern people to handle their work. In order to achieve more functions, the electronic components used have become more complex and more numerous, which will generate heat and become the so-called heat source. And under the influence of factors such as the increase in processing data and the increase in speed, the heat generated will also greatly increase. Therefore, if efforts are not made to effectively remove the aforementioned heat, it will increase the working environment temperature of the computer and its internal electronic components, which will relatively worsen its performance. In severe cases, it may even cause damage to the electronic components or cause a crash. etc.

In order to solve the above-mentioned problems, the industry has developed products such as cooling pads for notebook computers, which mainly install cooling fans inside the cooling pads, and use the cooling fans to blow away the heat generated by the aforementioned electronic heat sources to achieve the goal. For the purpose of heat dissipation, speeding up the speed of the cooling fan to provide a large amount of airflow is the simplest and most economical method. However, this method produces larger noise.

Therefore, how to create a cooling pad that overcomes noise is a technical issue that the author wants to solve.

One purpose of the present invention is to provide a cooling pad with a noise reduction mechanism, which can overcome the disturbing noise generated by the cooling fan during operation through the arrangement of the noise reduction module.

In order to achieve the above purpose, the present invention provides a cooling pad with a noise reduction mechanism, which includes a base body, at least one cooling fan and a noise reduction module. The base body includes a holding base and a heat sink formed inside the holding base. The accommodation chamber is provided with a plurality of ventilation holes communicating with the accommodation chamber; the cooling fan is arranged in the accommodation chamber and is configured corresponding to each ventilation hole; the noise reduction module is arranged in In the accommodation chamber, the noise reduction module includes an active noise reduction controller, a speaker electrically connected to the active noise reduction controller, and a microphone electrically connected to the active noise reduction controller; wherein the After the microphone receives the noise emitted by the cooling fan, through the operation and communication of the active noise reduction controller, a noise reduction sound that can offset the noise of the cooling fan is emitted from the speaker.

This new model also has the following functions. By separating the microphone from the active noise reduction controller and the speaker, the microphone can be placed close to the cooling fan, so as to more accurately detect the noise source and implement countermeasures. Through the setting of the supporting components, the base can be adjusted to different elevation angles according to the user's needs.

The detailed description and technical content of the present invention are described below with reference to the drawings. However, the attached drawings are only for reference and illustration and are not intended to limit the present invention.

Referring to FIGS. 1 to 3 , the present invention provides a cooling pad with a noise reduction mechanism, which mainly includes a base 10 , at least one cooling fan 20 and a noise reduction module 30 .

The base 10 mainly includes a holding base 11 and a lower plate 12. The holding base 11 has an upper plate 111 and a coaming plate 113 that bends and extends downward from the upper plate 111. The lower plate 12 is connected corresponding to the coaming plate 113. An accommodating chamber 13 is formed inside the holding seat 11 and the lower plate 12 , and a plurality of ventilation holes 112 communicating with the accommodating chamber 13 are provided on the upper plate 111 . The lower plate 12 is provided with a plurality of through slots 121 to communicate with the accommodating chamber 13. In addition, a plurality of protrusions 122 are provided on one side of the lower plate 12, and the protrusions 122 are arranged at equal intervals.

The cooling fans 20 are disposed in the accommodation chamber 13 and configured corresponding to each ventilation hole 112. The number of the cooling fans 20 in this embodiment is two, but is not limited to this, and it can also be a single number. Each cooling fan 20 is arranged at intervals and fixed below the upper plate 111 .

The noise reduction module 30 is arranged in the accommodation chamber 13, and mainly includes an active noise reduction controller (Active Noise Cancellation, ANC) 31, a speaker 32 electrically connected to the active noise reduction controller 31, and The active noise reduction controller 31 is electrically connected to a microphone 33 .

The noise reduction module 30 of this embodiment also includes a circuit board 34 , in which the active noise reduction controller 31 , the speaker 32 and the microphone 33 are electrically connected through circuits on the circuit board 34 . The microphone 33 includes a reference microphone 331 and an error microphone 332 (as shown in Figure 3). The power source of the circuit board 34 is provided by the self-cooling fan 20 .

The novel cooling pad with a noise reduction mechanism can be provided for a laptop computer (not shown). The cooling fan 20 will operate according to the fan control signal. The greater the value of the fan control signal, the smaller the cooling pad in the cooling fan 20 will be. The faster the motor rotates, the stronger the heat dissipation effect will be, but it will also produce greater noise. In one embodiment, the fan control signal may be a square wave signal of pulse width modulation (PWM), and the motor speed in the cooling fan 20 is adjusted by changing its duty cycle. The noise source of the cooling fan 20 during operation comes from the air flow caused by the rotation of the motor. The narrow-band component may originate from the thickness noise of the volume displacement generated by the movement of the fan blade, or from the variable load force on the surface of the fan blade (with a shaft). The blade passing frequency (BPF) noise caused by the upward lift force and the pulling force on the fan surface). Because the blade passing frequency and associated harmonics are related to the pressure disturbance generated when each blade passes a fixed reference point, a specific narrow-band noise is generated when a periodic pressure wave is generated at the blade tip. On the other hand, when the air flows through the fan blade, it will be peeled off from the boundary layer of the fan blade or both sides of the blade tip to form alternating vortices. This phenomenon is called vortex shedding. Vortex stripping will cause the instantaneous velocities of the fluid on both sides of the fan blade to be different. Under different fluid velocities, the instantaneous pressure on both sides of the fan blade will also be different. Therefore, the fan blade will vibrate and produce specific broadband noise.

The reference microphone 331 is disposed close to each blade of the cooling fan 20 to capture the noise generated when the cooling fan 20 is operating, and transmits a measured broadband noise signal to the active noise reduction controller 31 , where the broadband noise signal includes the broadband noise spectrum of the airflow noise generated when the cooling fan 20 is operating. In one embodiment, the reference microphone 331 may be a digital Micro Electro Mechanical System (MEMS) microphone, which has high heat resistance, high vibration resistance, and high radio frequency interference resistance.

The error microphone 332 is used to capture the overall noise of each blade of the cooling fan 20 during operation, and output a corresponding error signal to the active noise reduction controller 31 , where the noise signal represents the noise to be eliminated during the operation of each fan blade. signal. Since the cooling fan 20 is the main noise source, the error microphone 332 can be disposed close to the cooling fan 20 , where the distance between the reference microphone 331 and the active noise reduction controller 31 is greater than the distance between the error microphone 332 and the active noise reduction controller 31 . distance. The error microphone 332 can detect noise through a primary path and a secondary path: the primary path is related to the signal transmission path between the cooling fan 20 and the error microphone 332, and the noise signal will be captured through the primary path; and the secondary path is related to In the signal transmission path between the speaker 32 and the error microphone 332, a corrected inverted noise signal, one of the related inverted noise signals, is captured through the secondary path. In more detail, the error signal output by the error microphone 332 is the difference between the noise signal and the corrected inverse noise signal. The smaller the value of the error signal, the better the noise reduction effect. In one embodiment, the error microphone 332 may be a digital MEMS microphone, which has high heat resistance, high vibration resistance, and high radio frequency interference resistance. However, the type of error microphone 332 does not limit the scope of the present invention.

The active noise reduction controller 31 can receive a synchronization signal, a broadband noise signal from a reference microphone 331, and an error signal from an error microphone 332, where the synchronization signal includes the structure (such as the number of blades of each fan) and operation of the relevant cooling fan 20 Information about settings (such as motor speed in different modes). Based on the synchronization signal and the broadband noise signal, the active noise reduction controller 31 can calculate the broadband noise in the noise generated by the cooling fan 20 during actual operation; based on the synchronization signal and the error signal, the active noise reduction controller 31 can calculate the heat dissipation The noise generated by the fan 20 during actual operation is narrow-band noise. Based on the calculated wide-band noise and narrow-band noise, the active noise reduction controller 31 can provide a speaker control signal to drive the speaker 32, so that the reverse noise signal provided by the speaker 32 can effectively cancel the noise signal, that is, try to maximize the noise signal. The error signal drops to 0.

The speaker 32 is an electronic component that can convert electronic signals into sound signals, and usually includes a diaphragm and a drive circuit composed of an electromagnet and a voice coil. The speaker 32 can operate according to a speaker control signal provided by the active noise reduction controller 31. When the current of the speaker control signal passes through the voice coil, the voice coil vibrates with the frequency of the current, and the diaphragm connected to the voice coil naturally vibrates. Following the vibration, the surrounding air is pushed to vibrate to produce a noise-reducing sound. In this novel embodiment, the diaphragm of the speaker 32 can generate an inverse noise signal according to the speaker control signal.

In one embodiment, the novel cooling pad with noise reduction mechanism further includes a support component 40 , one end of which is pivotally connected to one side of the base body 10 , and the other end is bendable to bear against the other side of the base body 10 . On the side, so that the base 10 forms an inclined shape, the support assembly 40 mainly includes a first support member 41 and a second support member 42. The two ends of the first support member 41 are respectively pivotally connected to the base 10 and the second support member 42. One end of the second support member 42 and the other end of the second support member 42 can selectively stop one of the aforementioned protrusions 122 so that the base body 10 can present different elevation angles.

Please refer to FIG. 4 . In addition to having most of the technical features of the aforementioned noise reduction module 30 , the noise reduction module 30A of this embodiment has the microphone 33 separated from the active noise reduction controller 31 and the speaker 32 . The microphone 33 is electrically connected to the circuit board 34 through a wire 35, so that the microphone 33 can be placed close to the cooling fan 20 to more accurately grasp the noise generated by it.

Please refer to Figure 5. In addition to having most of the technical features of the noise reduction module 30 mentioned above, the noise reduction module 30B of this embodiment has a plurality of microphones 33 and conductive wires 35. Each microphone 33 passes through each wire. The wires 35 are electrically connected to the circuit board 34, so that the microphones 33 are respectively arranged between the cooling fans 20 and on one side of the cooling fans 20 according to actual usage requirements.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Other equivalent changes that apply the patent spirit of the present invention shall all fall within the patent scope of the present invention.

10:Matrix 11: Holding seat 111:On the board 112: Ventilation hole 113:hoarding 12: Lower board 121:Through slot 122:convex body 13: Accommodation chamber 20: Cooling fan 30, 30A, 30B: Noise reduction module 31:Active noise reduction controller 32: Speaker 33:Microphone 331: Reference microphone 332: Error microphone 34:Circuit board 35: Lead wire 40:Support components 41:First support member 42:Second support member

Figure 1 is a cross-sectional view of the new cooling pad assembly with noise reduction mechanism.

Figure 2 is a combined cross-sectional view from another direction of the new cooling pad with noise reduction mechanism.

Figure 3 is a block diagram of the new noise reduction module and cooling fan.

Figure 4 is an assembled cross-sectional view of another embodiment of the present invention.

Figure 5 is an assembled cross-sectional view of yet another embodiment of the present invention.

10:Matrix

11: Holding seat

111:On the board

112: Ventilation hole

113:hoarding

12: Lower board

121:Through slot

122:convex body

13: Accommodation chamber

20: Cooling fan

30: Noise reduction module

31:Active noise reduction controller

32: Speaker

33:Microphone

34:Circuit board

40:Support components

41:First support member

42:Second support member

Claims (10)

A cooling pad with a noise reduction mechanism, including: A base body including a receiving seat and a receiving chamber formed inside the receiving seat, and the receiving seat is provided with a plurality of ventilation holes communicating with the receiving chamber; At least one cooling fan is disposed in the accommodation chamber and configured corresponding to each ventilation hole; and A noise reduction module is disposed in the accommodation chamber. The noise reduction module includes an active noise reduction controller, a speaker electrically connected to the active noise reduction controller, and a speaker electrically connected to the active noise reduction controller. A microphone for sexual connection; After the microphone receives the noise emitted by the cooling fan, through the operation and communication of the active noise reduction controller, a noise reduction sound that can offset the noise of the cooling fan is emitted from the speaker. The cooling pad with a noise reduction mechanism as described in claim 1, wherein the noise reduction module further includes a circuit board, and the active noise reduction controller, the speaker and the microphone are electrically connected through the circuit board. The cooling pad with noise reduction mechanism as described in claim 2, wherein the circuit board is electrically connected to the cooling fan. The cooling pad with noise reduction mechanism as described in claim 1, wherein the noise reduction module also includes a circuit board and a wire, the active noise reduction controller and the speaker are fixed on the circuit board, and the microphone is connected through The lead wire is electrically connected to the circuit board and is located on one side of the cooling fan. The cooling pad with a noise reduction mechanism as described in claim 1, wherein the noise reduction module further includes a circuit board and a plurality of conductors, the number of microphones is a plurality, and each microphone is connected to the conductor through each conductor. The circuit board is electrically connected. The cooling pad with noise reduction mechanism as described in claim 1, wherein the microphone includes a reference microphone and an error microphone. The cooling pad with a noise reduction mechanism as described in claim 1, wherein the base further includes a lower plate, the holding base has an upper plate and a surrounding plate bent and extended from the upper plate, and the lower plate corresponds to the The enclosure panels are connected, and the accommodation chamber is formed between the holding seat and the lower plate. The heat dissipation pad with a noise reduction mechanism as described in claim 7, wherein the lower plate is provided with a plurality of through slots connected to the accommodation chamber. The cooling pad with a noise reduction mechanism as claimed in claim 7, further comprising a support component, one end of which is pivotally connected to one side of the base body, and the other end of which can be bent against on the other side of the base. The cooling pad with a noise reduction mechanism as claimed in claim 9, wherein the lower plate is provided with a plurality of protrusions, the support assembly includes a first support member and a second support member, and the two ends of the first support member are respectively One end of the base body and the second support member is pivotally connected, and the other end of the second support member can selectively stop one of the protrusions.

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