Loudspeaker temperature monitoring circuit and intelligent sound box

Abstract

The utility model discloses a loudspeaker temperature monitoring circuit and an intelligent sound box. The loudspeaker temperature monitoring circuit comprises a comparator, a temperature measurement circuit, a reference voltage generation circuit and a trigger circuit. The reference voltage generation circuit is used for generating a reference voltage signal, and the output end of the reference voltage generation circuit is connected with the first input end of the comparator. The temperature measurement circuit comprises a thermistor, the thermistor is arranged on the loudspeaker and used for detecting the temperature of the loudspeaker to obtain a temperature measurement voltage signal, and one end of the thermistor is connected with the second input end of the comparator so that the comparator can compare the temperature measurement voltage signal with the reference voltage signal. The output end of the comparator is connected with the control end of the trigger circuit so as to control the trigger circuit to output a trigger signal, the trigger signal is used for feeding back a temperature detection result, and compared with a traditional intelligent sound box technology, the temperature of the loudspeaker can be monitored so as to further control the temperature of the loudspeaker.

Description

Technical Field

[0001] The present application relates to the technical field of speaker equipment, and in particular to a speaker temperature monitoring circuit and a smart speaker. Background Art

[0002] A speaker is a device that can convert audio signals into sound. The speaker is the terminal of the entire sound system. Its function is to convert audio electrical energy into corresponding sound energy and radiate it into space. It is an extremely important component of the sound system, responsible for converting electrical signals into sound signals for people to hear directly. The speaker inside the speaker consumes the most power and is prone to heat, so there is a risk of overheating, but existing speakers cannot monitor the temperature of the speaker. Utility Model Content

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a speaker temperature monitoring circuit and a smart speaker, which can solve the problem that traditional speaker technology cannot monitor the temperature of the speaker.

[0004] The speaker temperature monitoring circuit according to the first aspect of the present application is applied to a smart speaker, including:

[0005] Comparator;

[0006] A reference voltage generating circuit, used for generating a reference voltage signal, wherein an output terminal of the reference voltage generating circuit is connected to a first input terminal of the comparator;

[0007] a temperature measurement circuit, the temperature measurement circuit comprising a thermistor, the thermistor being arranged on the speaker to detect the temperature of the speaker to obtain a temperature measurement voltage signal, one end of the thermistor being connected to the second input end of the comparator to enable the comparator to compare the temperature measurement voltage signal with the reference voltage signal;

[0008] A trigger circuit, wherein the output end of the comparator is connected to the control end of the trigger circuit to control the trigger circuit to output a trigger signal, and the trigger signal is used to feed back the temperature detection result.

[0009] The speaker temperature monitoring circuit according to the first aspect of the present application has at least the following beneficial effects:

[0010] The reference voltage generating circuit generates a reference voltage signal, and the thermistor detects the temperature of the speaker to generate a temperature measurement voltage signal. The temperature measurement voltage signal varies with the temperature of the speaker. The comparator compares the reference voltage signal and the temperature measurement voltage signal to confirm whether the speaker temperature is too high. When the speaker temperature is too high, the output signal of the comparator controls the trigger circuit to output a trigger signal, thereby feeding back the temperature detection result of the speaker. Compared with the traditional smart speaker technology, the speaker temperature monitoring circuit of the embodiment of the present application can monitor the temperature of the speaker to facilitate further temperature control of the speaker.

[0011] According to some embodiments of the present application, the reference voltage generating circuit includes a first resistor and a second resistor, one end of the first resistor is connected to a power supply end, the other end of the first resistor is connected to the first input end, the other end of the first resistor is connected to one end of the second resistor, and the other end of the second resistor is grounded.

[0012] According to some embodiments of the present application, the temperature measurement circuit also includes a third resistor, one end of the thermistor is connected to one end of the third resistor, the other end of the third resistor is grounded, and the other end of the thermistor is connected to a power supply end.

[0013] According to some embodiments of the present application, the trigger circuit includes a transistor and a fourth resistor, one end of the fourth resistor is connected to the power supply end, the other end of the fourth resistor is connected to the collector of the transistor, the emitter of the transistor is grounded, and the output end of the comparator is connected to the base of the transistor.

[0014] According to some embodiments of the present application, the trigger circuit further includes a first capacitor, one end of the first capacitor is connected to one end of the fourth resistor, and the other end of the first capacitor is grounded.

[0015] According to some embodiments of the present application, the trigger circuit also includes a fifth resistor and a sixth resistor, the output end of the comparator is connected to one end of the fifth resistor, the other end of the fifth resistor is connected to the base of the transistor, the other end of the fifth resistor is connected to one end of the sixth resistor, and the other end of the sixth resistor is grounded.

[0016] According to some embodiments of the present application, the trigger circuit further includes a second capacitor, one end of the second capacitor is connected to one end of the sixth resistor, and the other end of the second capacitor is grounded.

[0017] According to some embodiments of the present application, a third capacitor and a fourth capacitor are further included, the power supply end of the comparator is connected to the power supply end, one end of the third capacitor is connected to the power supply end, the other end of the third capacitor is grounded, one end of the fourth capacitor is connected to the power supply end, and the other end of the fourth capacitor is grounded.

[0018] According to some embodiments of the present application, the model of the comparator is NCX2200.

[0019] The smart speaker according to the second aspect of the present application includes the above-mentioned speaker temperature monitoring circuit.

[0020] The smart speaker according to the second aspect of the present application has at least the following beneficial effects:

[0021] The reference voltage generating circuit generates a reference voltage signal, and the thermistor detects the temperature of the speaker to generate a temperature measurement voltage signal. The size of the temperature measurement voltage signal varies with the temperature of the speaker. The comparator compares the reference voltage signal and the temperature measurement voltage signal to confirm whether the speaker temperature is too high. When the speaker temperature is too high, the output terminal of the comparator outputs a signal to control the trigger circuit to output a trigger signal, thereby feeding back the temperature detection result of the speaker. Compared with traditional smart speaker technology, the smart speaker of the embodiment of the present application can monitor the temperature of the speaker to facilitate further temperature control of the speaker.

[0022] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present application is further described below with reference to the accompanying drawings and embodiments, wherein:

[0024] Figure 1 FIG. 4 is a circuit diagram of a speaker temperature monitoring circuit in an embodiment of the present application. DETAILED DESCRIPTION

[0025] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0026] In the description of the present application, it should be understood that the descriptions involving orientation, such as the orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0027] In the description of this application, "a plurality" means more than two. If there is a description of "first" or "second", it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0028] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0029] Refer to the following Figure 1 A speaker temperature monitoring circuit and a smart speaker according to an embodiment of the present application are described.

[0030] The speaker temperature monitoring circuit according to the embodiment of the present application is applied to a smart speaker, such as Figure 1 As shown, it includes: a comparator U1, a temperature measurement circuit, a reference voltage generating circuit and a trigger circuit. The reference voltage generating circuit is used to generate a reference voltage signal, and the output end of the reference voltage generating circuit is connected to the first input end of the comparator U1. The temperature measurement circuit includes a thermistor R3, which is arranged on the speaker to detect the temperature of the speaker to obtain a temperature measurement voltage signal, and one end of the thermistor R3 is connected to the second input end of the comparator U1 so that the comparator U1 compares the temperature measurement voltage signal with the reference voltage signal. The output end of the comparator U1 is connected to the control end of the trigger circuit to control the trigger circuit to output a trigger signal, and the trigger signal is used to feed back the temperature detection result.

[0031] In this embodiment, a reference voltage signal is generated by a reference voltage generating circuit, and the thermistor R3 detects the temperature of the speaker to generate a temperature measurement voltage signal. The size of the temperature measurement voltage signal varies with the temperature of the speaker. The comparator U1 compares the reference voltage signal and the temperature measurement voltage signal to confirm whether the speaker temperature is too high. When the speaker temperature is too high, the output terminal of the comparator U1 outputs a signal to control the trigger circuit to output a trigger signal, thereby feeding back the temperature detection result of the speaker. Compared with traditional smart speaker technology, the speaker temperature monitoring circuit of the embodiment of the present application can monitor the temperature of the speaker to facilitate further temperature control of the speaker.

[0032] It should be noted that within a certain temperature range, the resistance of thermistor R3 changes with the temperature of the speaker. Thermistor R3 can be selected according to the application scenario. For example, when the temperature of the selected thermistor R3 increases from -40℃ to +120℃, its resistance changes from 220KΩ to 0.6KΩ. Especially at +60℃, the corresponding resistance of thermistor R3 is 3KΩ. The circuit board of the speaker temperature monitoring circuit is attached to the magnet on the back of the speaker to pick up the temperature closest to the speaker and accurately monitor the speaker temperature.

[0033] It is understandable that the trigger signal is transmitted to the MCU of the smart speaker. After receiving the trigger signal, the MCU confirms that the temperature of the speaker is too high.

[0034] In one embodiment of the present application, Figure 1 As shown, the reference voltage generating circuit includes a first resistor R2 and a second resistor R6, one end of the first resistor R2 is connected to the power supply end, the other end of the first resistor R2 is connected to the first input end, the other end of the first resistor R2 is connected to one end of the second resistor R6, and the other end of the second resistor R6 is grounded.

[0035] In this embodiment, the voltage of the power supply end is divided by the first resistor R2 and the second resistor R6, and the voltage between the first resistor R2 and the second resistor R6 is taken as a reference voltage signal and input to the first input end of the comparator U1 for comparison with the temperature measurement voltage signal.

[0036] It can be understood that the first input terminal of the comparator U1 is an inverting input terminal, and the second input terminal of the comparator U1 is a non-inverting input terminal.

[0037] It should be noted that the resistance values ​​of the first resistor R2 and the second resistor R6 can be set according to the specific application scenario so that the magnitude of the generated reference voltage signal is suitable for comparison with the temperature measurement voltage signal. For example, the resistance values ​​of the first resistor R2 and the second resistor R6 are both 3KΩ, and the first resistor R2 and the second resistor R6 divide the 3.3V voltage of the power supply end to obtain a 1.65V reference voltage signal.

[0038] In one embodiment of the present application, Figure 1 As shown, the temperature measurement circuit also includes a third resistor R7, one end of the thermistor R3 is connected to one end of the third resistor R7, the other end of the third resistor R7 is grounded, and the other end of the thermistor R3 is connected to the power supply end.

[0039] In this embodiment, the power supply voltage is divided by the third resistor R7 and the thermistor R3, and the voltage between the thermistor R3 and the third resistor R7 is taken as the temperature measurement voltage signal and input to the second input terminal of the comparator U1 for comparison with the reference voltage signal.

[0040] It is understandable that the resistance of the third resistor R7 can be set according to the specific application scenario. For example, the resistance of the third resistor R7 is set to 3KΩ. When the temperature of the thermistor R3 is less than 60°C, the resistance of the thermistor R3 is greater than 3KΩ. Since the voltage at the power supply end is 3.3V, the temperature measurement voltage signal is less than 1.65V. When the temperature of the thermistor R3 is greater than 60°C, the resistance of the thermistor R3 is less than 3KΩ, and the temperature measurement voltage signal is greater than 1.65V.

[0041] When the temperature of thermistor R3 is greater than 60°C, the voltage at the non-inverting input of comparator U1 is greater than 1.65V, the inverting input is equal to 1.65V, and the output of comparator U1 outputs a high-level signal. When the temperature of thermistor R3 is less than 60°C, the voltage at the non-inverting input of comparator U1 is less than 1.65V, the inverting input is equal to 1.65V, and the output of comparator U1 outputs a low-level signal. Comparator U1 controls the trigger circuit by outputting a high-level signal or a low-level signal.

[0042] In one embodiment of the present application, Figure 1 As shown, the trigger circuit includes a transistor Q1 and a fourth resistor R1, one end of the fourth resistor R1 is connected to the power supply end, the other end of the fourth resistor R1 is connected to the collector of the transistor Q1, the emitter of the transistor Q1 is grounded, and the output end of the comparator U1 is connected to the base of the transistor Q1.

[0043] In this embodiment, the trigger signal is output through the fourth resistor R1, and the trigger signal is a high level or a low level. When the temperature of the thermistor R3 is low, the output end of the comparator U1 outputs a low level signal, the base of the transistor Q1 is a low level, and the transistor Q1 is not turned on. Since the fourth resistor R1 is a pull-up resistor, a high level is output through the fourth resistor R1. When the temperature of the thermistor R3 is high, the output end of the comparator U1 outputs a high level signal, the base of the transistor Q1 is a high level, and the transistor Q1 is turned on. At this time, the fourth resistor R1 is pulled down to the ground, thereby outputting a low level.

[0044] In one embodiment of the present application, Figure 1 As shown, the trigger circuit further includes a first capacitor C3, one end of the first capacitor C3 is connected to one end of the fourth resistor R1, and the other end of the first capacitor C3 is grounded.

[0045] In this embodiment, the first capacitor C3 plays a filtering role.

[0046] In one embodiment of the present application, Figure 1 As shown, the trigger circuit also includes a fifth resistor R4 and a sixth resistor R5, the output end of the comparator U1 is connected to one end of the fifth resistor R4, the other end of the fifth resistor R4 is connected to the base of the transistor Q1, the other end of the fifth resistor R4 is connected to one end of the sixth resistor R5, and the other end of the sixth resistor R5 is grounded.

[0047] In this embodiment, the output voltage of the comparator U1 is divided by the fifth resistor R4 and the sixth resistor R5, and the voltage between the fifth resistor R4 and the sixth resistor R5 is used to control the transistor Q1.

[0048] In one embodiment of the present application, Figure 1 As shown, the trigger circuit further includes a second capacitor C4, one end of the second capacitor C4 is connected to one end of the sixth resistor R5, and the other end of the second capacitor C4 is grounded.

[0049] In this embodiment, the second capacitor C4 plays a filtering role.

[0050] In one embodiment of the present application, Figure 1 As shown, it also includes a third capacitor C1 and a fourth capacitor C2, the power supply end of the comparator U1 is connected to the power supply end, one end of the third capacitor C1 is connected to the power supply end, the other end of the third capacitor C1 is grounded, one end of the fourth capacitor C2 is connected to the power supply end, and the other end of the fourth capacitor C2 is grounded.

[0051] In the embodiment of the present application, the third capacitor C1 and the fourth capacitor C2 play a filtering role.

[0052] In one embodiment of the present application, the model of the comparator U1 is NCX2200.

[0053] In addition, an embodiment of the present application discloses a smart speaker, including the above-mentioned speaker temperature monitoring circuit.

[0054] In this embodiment, a reference voltage signal is generated by a reference voltage generating circuit, and the thermistor R3 detects the temperature of the speaker to generate a temperature measurement voltage signal. The size of the temperature measurement voltage signal varies with the temperature of the speaker. The comparator U1 compares the reference voltage signal and the temperature measurement voltage signal to confirm whether the speaker temperature is too high. When the speaker temperature is too high, the output terminal of the comparator U1 outputs a signal to control the trigger circuit to output a trigger signal, thereby feeding back the temperature detection result of the speaker. Compared with traditional smart speaker technology, the smart speaker of the embodiment of the present application can monitor the temperature of the speaker to facilitate further temperature control of the speaker.

[0055] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present application.

Claims

1. A speaker temperature monitoring circuit, characterized in that: include: Comparator; A reference voltage generating circuit, used for generating a reference voltage signal, wherein an output terminal of the reference voltage generating circuit is connected to a first input terminal of the comparator; a temperature measurement circuit, the temperature measurement circuit comprising a thermistor, the thermistor being arranged on the speaker to detect the temperature of the speaker to obtain a temperature measurement voltage signal, one end of the thermistor being connected to the second input end of the comparator to enable the comparator to compare the temperature measurement voltage signal with the reference voltage signal; A trigger circuit, wherein the output end of the comparator is connected to the control end of the trigger circuit to control the trigger circuit to output a trigger signal, and the trigger signal is used to feed back the temperature detection result.

2. The speaker temperature monitoring circuit according to claim 1, characterized in that: The reference voltage generating circuit includes a first resistor and a second resistor, one end of the first resistor is connected to a power supply end, the other end of the first resistor is connected to the first input end, the other end of the first resistor is connected to one end of the second resistor, and the other end of the second resistor is grounded.

3. The speaker temperature monitoring circuit according to claim 1, characterized in that: The temperature measurement circuit also includes a third resistor, one end of the thermistor is connected to one end of the third resistor, the other end of the third resistor is grounded, and the other end of the thermistor is connected to a power supply end.

4. The speaker temperature monitoring circuit according to claim 1, characterized in that: The trigger circuit includes a transistor and a fourth resistor, one end of the fourth resistor is connected to the power supply end, the other end of the fourth resistor is connected to the collector of the transistor, the emitter of the transistor is grounded, and the output end of the comparator is connected to the base of the transistor.

5. The speaker temperature monitoring circuit according to claim 4, characterized in that: The trigger circuit further includes a first capacitor, one end of the first capacitor is connected to one end of the fourth resistor, and the other end of the first capacitor is grounded.

6. The speaker temperature monitoring circuit according to claim 5, characterized in that: The trigger circuit also includes a fifth resistor and a sixth resistor, the output end of the comparator is connected to one end of the fifth resistor, the other end of the fifth resistor is connected to the base of the transistor, the other end of the fifth resistor is connected to one end of the sixth resistor, and the other end of the sixth resistor is grounded.

7. The speaker temperature monitoring circuit according to claim 6, characterized in that: The trigger circuit further includes a second capacitor, one end of the second capacitor is connected to one end of the sixth resistor, and the other end of the second capacitor is grounded.

8. The speaker temperature monitoring circuit according to claim 1, characterized in that: It also includes a third capacitor and a fourth capacitor, the power supply end of the comparator is connected to the power supply end, one end of the third capacitor is connected to the power supply end, the other end of the third capacitor is grounded, one end of the fourth capacitor is connected to the power supply end, and the other end of the fourth capacitor is grounded.

9. The speaker temperature monitoring circuit according to claim 1, characterized in that: The model of the comparator is NCX2200.

10. Smart speaker, characterized in that, The loudspeaker temperature monitoring circuit comprises the loudspeaker temperature monitoring circuit as claimed in any one of claims 1 to 9.

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