Horn temperature protection circuit and horn device

Abstract

The embodiment of the utility model discloses a horn temperature protection circuit and a horn device, and relates to the technical field of temperature protection. The loudspeaker temperature protection circuit comprises a control chip, a loudspeaker, an audio signal output circuit and a temperature fuse. The loudspeaker comprises magnetic steel. The control chip is connected with the audio signal output circuit, the audio signal output circuit is connected with the loudspeaker, the temperature fuse is arranged on the magnetic steel in an attached mode, the temperature fuse is connected into the audio signal output circuit, and the control chip is connected with the audio signal output circuit. When the temperature of the magnetic steel is higher than a preset temperature threshold value, the temperature fuse cuts off the audio signal output circuit, so that the loudspeaker stops working, safety events caused by continuous over-high temperature of the loudspeaker are avoided, the requirement of explosion-proof authentication is met, and the safety is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of temperature protection technology, and in particular to a horn temperature protection circuit and horn device. Background Technology

[0002] Domestic and international explosion-proof certifications impose restrictions on the surface temperature of devices. Taking the international ATEX Zone 1 explosion-proof standard as an example, the standard requires, in accordance with "IEC 60079-11 Edition 2023-01 5.4.5", that the surface temperature of the device should not exceed 135℃. Therefore, smart terminals are required to implement temperature protection measures when the device is in operation to ensure that the protection does not meet the certification standard requirements.

[0003] Taking temperature protection of a smart terminal, such as a mobile phone speaker, as an example, if the speaker is working and there is external or internal damage, such as a short circuit in one of the interfaces from the PA output to the speaker, the audio output to the speaker's negative terminal will not receive a feedback signal, and a large current will continue to flow to the speaker. In this short-circuit state, the speaker's temperature will rise sharply. When the temperature exceeds the standard temperature required by ATEX, there must be a forced disconnect mechanism to prevent the temperature from rising further, allowing the damaged equipment to continue operating and causing a safety incident (over-temperature disconnection to prevent continued operation is a mandatory requirement for ATEX certification).

[0004] A loudspeaker is an electroacoustic transducer. When an appropriate current passes through the loudspeaker coil, it generates a magnetic field that causes the diaphragm to vibrate, compressing air and producing sound. The loudspeaker itself generates heat during normal operation. When the wattage is high and the sealed heat dissipation environment is poor, the loudspeaker's operating temperature can become quite high, exceeding standard temperature requirements. Therefore, how to effectively protect the loudspeaker from excessively high temperatures and prevent it from continuing to overheat has become a pressing technical problem in this field. Utility Model Content

[0005] This utility model provides a speaker temperature protection circuit and speaker device, aiming to solve the problem of how to effectively protect the speaker from temperature.

[0006] To address the aforementioned problems, in a first aspect, this utility model provides a speaker temperature protection circuit, comprising a control chip, a speaker, an audio signal output circuit, and a temperature fuse. The speaker includes a magnet. The control chip is connected to the audio signal output circuit, which is connected to the speaker. The temperature fuse is attached to the magnet and connected to the audio signal output circuit. When the temperature of the magnet exceeds a preset temperature threshold, the temperature fuse cuts off the audio signal output circuit, causing the speaker to stop working.

[0007] A further technical solution is that the audio signal output circuit includes a first signal line and a second signal line, both of which are connected to the control chip and the speaker respectively; the thermal fuse is connected to the first signal line or the second signal line.

[0008] A further technical solution is that the thermal fuse includes a first pin and a second pin, the speaker includes a third pin and a fourth pin, the first pin of the thermal fuse is connected to the third pin of the speaker, the second pin of the thermal fuse is connected to the first signal line, and the fourth pin of the speaker is connected to the second signal line.

[0009] A further technical solution is that the first signal line is a positive differential signal output line, and the second signal line is a negative differential signal output line.

[0010] A further technical solution is that the audio signal output circuit further includes a first inductor and a first capacitor, the first inductor being connected to the first signal line, and the first capacitor being connected to the first signal line and grounded.

[0011] A further technical solution is that the audio signal output circuit further includes a second inductor and a second capacitor, the second inductor being connected to the second signal line, and the second capacitor being connected to the second signal line and grounded.

[0012] A further technical solution is that the audio signal output circuit further includes a first TVS diode and a second TVS diode, wherein the first TVS diode is connected to the first signal line and grounded; and the second TVS diode is connected to the second signal line and grounded.

[0013] A further technical solution is that the speaker temperature protection circuit also includes an audio signal input circuit, which includes a third signal line and a fourth signal line, and the third signal line and the fourth signal line are respectively connected to the control chip and the audio source device.

[0014] A further technical solution is that the audio signal input circuit further includes a third capacitor, a fourth capacitor, a first resistor, and a second resistor; the third capacitor is connected to the third signal line, and the fourth capacitor is connected to the fourth signal line; the first resistor is connected to the third signal line and grounded, and the second resistor is connected to the fourth signal line and grounded.

[0015] Secondly, this utility model provides a horn device, which includes the horn temperature protection circuit as described in the first aspect.

[0016] Compared with the prior art, the technical effects achieved by the embodiments of this utility model include:

[0017] In this embodiment of the invention, the speaker temperature protection circuit includes a control chip, a speaker, an audio signal output circuit, and a thermal fuse. The speaker includes a magnet. The control chip is connected to the audio signal output circuit, which is connected to the speaker. The thermal fuse is attached to the magnet and connected to the audio signal output circuit. When the temperature of the magnet exceeds a preset temperature threshold, the thermal fuse cuts off the audio signal output circuit, causing the speaker to stop working. This prevents the speaker from overheating and causing safety incidents, thus meeting the requirements for explosion-proof certification and greatly improving safety. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0021] Figure 1 This is a schematic diagram of the structure of a speaker temperature protection circuit proposed in an embodiment of the present invention;

[0022] Figure 2 A circuit diagram of the audio signal output circuit of a speaker temperature protection circuit proposed in this embodiment of the present invention.

[0023] Figure 3 The circuit diagram shows the audio signal input circuit of a speaker temperature protection circuit proposed in this embodiment of the present invention.

[0024] Figure Labels

[0025] Control chip U1, speaker 10, thermal fuse 30, magnet 11, first signal line 21, second signal line 22, third signal line 41, fourth signal line 42, first pin 31, second pin 32, third pin 12, fourth pin 13, first inductor L1, first capacitor C11, second inductor L2, second capacitor C12, first TVS diode T1, second TVS diode T2, third capacitor C1, fourth capacitor C2, first resistor R1, second resistor R2. Detailed Implementation

[0026] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Similar component reference numerals in the drawings represent similar components. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0027] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0028] It should also be understood that the terminology used in this specification of embodiments of the present invention is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of the present invention. As used in this specification of embodiments of the present invention and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0029] See Figures 1-3 This utility model embodiment proposes a speaker temperature protection circuit. This circuit can cut off the operation of the speaker 10 when its temperature is too high, preventing safety incidents caused by sustained high temperatures and thus meeting explosion-proof certification requirements, greatly improving safety. To achieve the above technical objectives, the speaker temperature protection circuit includes a control chip U1, a speaker 10, an audio signal output circuit, and a temperature fuse 30. The specific structure is described below:

[0030] The speaker 10 includes a magnet 11, which is the heating element in the speaker 10. The temperature of the magnet 11 can reflect the temperature status of the speaker 10.

[0031] The control chip U1 is connected to the audio signal output circuit, which is connected to the speaker 10. The control chip U1 is used to output audio signals to the speaker 10 through the audio signal output circuit.

[0032] The thermal fuse 30 is attached to the magnet 11 and is connected to the audio signal output circuit. The thermal fuse 30, also called a thermal circuit breaker, is a device that cuts off the temperature sensing circuit. The thermal fuse 30 is attached to the magnet 11 (for example, it can be bonded, but this invention is not specifically limited to this method), thereby enabling accurate sensing of the temperature of the magnet 11.

[0033] In this embodiment of the invention, when the temperature of the magnet 11 exceeds a preset temperature threshold, the temperature fuse 30 cuts off the audio signal output circuit, causing the speaker 10 to stop working. This prevents the speaker 10 from overheating and causing a safety incident, thus meeting the requirements for explosion-proof certification and greatly improving safety. The temperature threshold can be specifically determined by the model of the temperature fuse 30. This invention does not specifically limit this; it is understood that those skilled in the art can select a suitable model of temperature fuse 30 according to temperature protection requirements to achieve controllable temperature threshold. This invention does not specifically limit this as well.

[0034] In this embodiment of the invention, the speaker temperature protection circuit includes a control chip U1, a speaker 10, an audio signal output circuit, and a temperature fuse 30. The speaker 10 includes a magnet 11. The control chip U1 is connected to the audio signal output circuit, which is also connected to the speaker 10. The temperature fuse 30 is attached to the magnet 11 and connected to the audio signal output circuit. When the temperature of the magnet 11 exceeds a preset temperature threshold, the temperature fuse 30 cuts off the audio signal output circuit, causing the speaker 10 to stop working. This prevents the speaker 10 from overheating and causing a safety incident, thus meeting the requirements for explosion-proof certification and greatly improving safety.

[0035] Furthermore, in some embodiments, such as this embodiment, the audio signal output circuit includes a first signal line 21 and a second signal line 22, both of which are connected to the control chip U1 and the speaker 10 respectively; the thermal fuse 30 is connected to the first signal line 21 or the second signal line 22.

[0036] Specifically, the first signal line 21 is a positive differential signal output line, and the second signal line 22 is a negative differential signal output line. The positive differential signal output line is used to output positive differential signals, and the negative differential signal output line is used to output negative differential signals. The positive and negative differential signals together constitute the audio signal of the speaker 10.

[0037] Furthermore, in some embodiments, such as this embodiment, the thermal fuse 30 is specifically wired as follows:

[0038] The thermal fuse 30 includes a first pin 31 and a second pin 32, and the speaker 10 includes a third pin 12 and a fourth pin 13. The first pin 31 of the thermal fuse 30 is connected to the third pin 12 of the speaker 10, the second pin 32 of the thermal fuse 30 is connected to the first signal line 21, and the fourth pin 13 of the speaker 10 is connected to the second signal line 22.

[0039] In this embodiment, the first signal line 21 is a positive differential signal output line, and the second signal line 22 is a negative differential signal output line. The thermal fuse 30 is connected to the first signal line 21, i.e., the positive differential signal output line. When the temperature of the speaker 10 exceeds a preset temperature threshold, the first signal line 21 is cut off, i.e., the operation of the speaker 10 is cut off, preventing the speaker 10 from overheating and causing a safety incident, thereby meeting the requirements of explosion-proof certification and greatly improving safety.

[0040] Furthermore, in some embodiments, such as this embodiment, the audio signal output circuit further includes a first inductor L1 and a first capacitor C11, the first inductor L1 being connected to the first signal line 21, and the first capacitor C11 being connected to the first signal line 21 and grounded.

[0041] Specifically, the first inductor L1 and the first capacitor C11 form a filter circuit in the first signal line 21, which can reliably filter out noise in the first signal line 21 and greatly improve the stability of the signal.

[0042] Furthermore, in some embodiments, such as this embodiment, the audio signal output circuit further includes a second inductor L2 and a second capacitor C12, the second inductor L2 being connected to the second signal line 22, and the second capacitor C12 being connected to the second signal line 22 and grounded.

[0043] Specifically, the second inductor L2 and the second capacitor C12 form a filter circuit in the second signal line 22, which can reliably filter out noise in the second signal line 22 and greatly improve the stability of the signal.

[0044] Understandably, in Figure 2 In the middle, the left side of the first inductor L1 and the second inductor L2 are connected to the control chip U1.

[0045] Furthermore, in some embodiments, such as this embodiment, the audio signal output circuit further includes a first TVS diode T1 and a second TVS diode T2, wherein the first TVS diode T1 is connected to the first signal line 21 and grounded; and the second TVS diode T2 is connected to the second signal line 22 and grounded.

[0046] Specifically, the first TVS diode T1 and the second TVS diode T2 serve a protective function, preventing high current surges and excessive current in the first signal line 21 and the second signal line 22, thereby preventing the speaker 10 from being burned out by high current surges.

[0047] Furthermore, in some embodiments, such as this embodiment, the speaker temperature protection circuit further includes an audio signal input circuit. The audio signal input circuit includes a third signal line 41 and a fourth signal line 42, both of which are connected to the control chip U1 and the audio source device, respectively. Specifically, the third signal line 41 can be a negative differential signal input line for inputting a negative differential signal; the fourth signal line 42 can be a positive differential signal input line for inputting a positive differential signal. The negative and positive differential signals constitute the audio signal. The audio source device refers to a device that generates audio signals; this invention is not specifically limited to this.

[0048] Furthermore, in some embodiments, such as this embodiment, the audio signal input circuit further includes a third capacitor C1, a fourth capacitor C2, a first resistor R1, and a second resistor R2; the third capacitor C1 is connected to the third signal line 41, and the fourth capacitor C2 is connected to the fourth signal line 42; the first resistor R1 is connected to the third signal line 41 and grounded, and the second resistor R2 is connected to the fourth signal line 42 and grounded.

[0049] Specifically, the third capacitor C1 and the first resistor R1 form a filter circuit in the third signal line 41, which can reliably filter out noise in the third signal line 41 and greatly improve the stability of the signal.

[0050] The fourth capacitor C2 and the second resistor R2 form a filter circuit in the fourth signal line 42, which can reliably filter out noise in the fourth signal line 42 and greatly improve the stability of the signal.

[0051] Understandably, in Figure 3 In this configuration, the right side of the third capacitor C1 and the fourth capacitor C2 is connected to the control chip U1.

[0052] Furthermore, in some embodiments, such as this embodiment, the speaker temperature protection circuit also includes peripheral circuits such as control and power supply, which are not specifically limited by this invention.

[0053] This utility model provides a horn device, which includes the horn temperature protection circuit described in any of the above embodiments.

[0054] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0055] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0056] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0057] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0058] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0059] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0060] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Since these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

[0061] The above description describes specific embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A horn temperature protection circuit, characterized in that, The device includes a control chip, a speaker, an audio signal output circuit, and a thermal fuse. The speaker includes a magnet. The control chip is connected to the audio signal output circuit, which is connected to the speaker. The thermal fuse is attached to the magnet and connected to the audio signal output circuit. When the temperature of the magnet exceeds a preset temperature threshold, the thermal fuse cuts off the audio signal output circuit, causing the speaker to stop working.

2. The horn temperature protection circuit according to claim 1, characterized in that, The audio signal output circuit includes a first signal line and a second signal line, which are respectively connected to the control chip and the speaker; the thermal fuse is connected to the first signal line or the second signal line.

3. The horn temperature protection circuit according to claim 2, characterized in that, The thermal fuse includes a first pin and a second pin, and the speaker includes a third pin and a fourth pin. The first pin of the thermal fuse is connected to the third pin of the speaker, the second pin of the thermal fuse is connected to the first signal line, and the fourth pin of the speaker is connected to the second signal line.

4. The horn temperature protection circuit according to claim 3, characterized in that, The first signal line is a positive differential signal output line, and the second signal line is a negative differential signal output line.

5. The horn temperature protection circuit according to claim 2, characterized in that, The audio signal output circuit further includes a first inductor and a first capacitor. The first inductor is connected to the first signal line, and the first capacitor is connected to the first signal line and grounded.

6. The horn temperature protection circuit according to claim 2, characterized in that, The audio signal output circuit further includes a second inductor and a second capacitor. The second inductor is connected to the second signal line, and the second capacitor is connected to the second signal line and grounded.

7. The horn temperature protection circuit according to claim 2, characterized in that, The audio signal output circuit further includes a first TVS diode and a second TVS diode. The first TVS diode is connected to the first signal line and grounded; the second TVS diode is connected to the second signal line and grounded.

8. The horn temperature protection circuit according to claim 1, characterized in that, The speaker temperature protection circuit also includes an audio signal input circuit, which includes a third signal line and a fourth signal line. The third signal line and the fourth signal line are respectively connected to the control chip and the audio source device.

9. The horn temperature protection circuit according to claim 8, characterized in that, The audio signal input circuit further includes a third capacitor, a fourth capacitor, a first resistor, and a second resistor; the third capacitor is connected to the third signal line, and the fourth capacitor is connected to the fourth signal line; the first resistor is connected to the third signal line and grounded, and the second resistor is connected to the fourth signal line and grounded.

10. A loudspeaker device, characterized in that, The horn device includes the horn temperature protection circuit as described in any one of claims 1-9.

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