CN220553292U - Buzzer circuit, electrical equipment and cooking equipment - Google Patents
Buzzer circuit, electrical equipment and cooking equipment Download PDFInfo
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- CN220553292U CN220553292U CN202321861245.4U CN202321861245U CN220553292U CN 220553292 U CN220553292 U CN 220553292U CN 202321861245 U CN202321861245 U CN 202321861245U CN 220553292 U CN220553292 U CN 220553292U
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- 238000010411 cooking Methods 0.000 title claims abstract description 22
- 239000003990 capacitor Substances 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 9
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- 230000004048 modification Effects 0.000 description 2
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Abstract
The utility model discloses a buzzer circuit, electrical equipment and cooking equipment. The buzzer circuit includes: the first end of the buzzer H is used for being connected with a signal source, the second end of the buzzer H is connected with a power line, the buzzer is a passive buzzer, the signal source is used for generating a driving signal, and the signal source and the buzzer are powered by the same power supply; the base electrode of the triode Q1 is connected with the first end of the buzzer H, the collector electrode of the triode Q1 is connected with a power line, and the emitter electrode of the triode Q1 is connected with a ground wire; the first resistor R1 is connected in series between the second end of the buzzer H and the power line; the second resistor R2 is connected in series between the first end of the buzzer H and the base electrode of the triode Q1. The utility model solves the problems of complex circuit and high cost caused by increasing the volume of the buzzer by increasing the power supply in the related technology.
Description
Technical Field
The utility model relates to the technical field of volume control, in particular to a buzzer circuit, electrical equipment and cooking equipment.
Background
The electrical product often adopts passive buzzer as the sound source to send out the suggestion sound, and passive buzzer passes through pulse signal drive sound production, and the maximum volume of buzzer has been decided to pulse signal's voltage size.
It should be noted that, the power supply voltage of the micro-control unit of the pulse signal is generally lower, if the micro-control unit is used to directly supply power to the pulse signal, the volume of the prompting sound sent by the buzzer is smaller, especially in some electric appliances with higher tightness requirements, the volume of the prompting sound sent by the buzzer is difficult to meet the product requirement.
In order to increase the maximum volume of the buzzer, a power supply with a higher voltage is additionally added to supply power to the buzzer in the related art, however, the circuit is more complicated due to the addition of the power supply, so that the volume of the electric appliance is increased, and meanwhile, the cost is higher.
Aiming at the problems of complex circuit and high cost caused by increasing the volume of the buzzer by increasing the power supply in the related art, no effective solution is proposed at present.
Disclosure of Invention
The utility model provides a buzzer circuit, electrical equipment and cooking equipment, which are used for solving the problems of complex circuit and high cost caused by increasing the volume of a buzzer by increasing a power supply in the related art.
According to one aspect of the present utility model, a buzzer circuit is provided. The buzzer circuit includes: the first end of the buzzer is used for being connected with a signal source, the second end of the buzzer is connected with a power line, the buzzer is a passive buzzer, the signal source is used for generating a driving signal, and the signal source and the buzzer are powered by the same power supply; the base electrode of the triode is connected with the first end of the buzzer, the collector electrode of the triode is connected with the power line, and the emitter electrode of the triode is connected with the ground wire; the first resistor is connected in series between the second end of the buzzer and the power line; the second resistor is connected in series between the first end of the buzzer and the base electrode of the triode. According to the embodiment, the buzzer is controlled through the triode, so that driving voltages at two ends of the buzzer are amplified, the problems that in the related art, the circuit is complex and the cost is high due to the fact that the volume of the buzzer is increased by increasing the power supply are solved, and the effect of increasing the maximum volume of the buzzer under the condition that the power supply is not additionally increased is achieved.
Optionally, the buzzer circuit further comprises: and the third resistor is connected in parallel with two ends of the base electrode and the emitter electrode of the triode. In this embodiment, the third resistor is used to stabilize the voltage of the base of the triode.
Optionally, the buzzer circuit further comprises: the protection element is arranged between the first end of the buzzer and the signal source. In this embodiment, the protection element is used to protect the input of the buzzer circuit. Optionally, the protection element is a capacitor or a resistor.
According to another aspect of the present utility model, an electrical device is provided. The device comprises: the buzzer circuit in the above embodiment; a micro control unit and an equipment body; the micro-control unit is connected with the equipment body and the buzzer circuit and used for controlling the equipment body to work and also used for providing a driving signal for the buzzer circuit, wherein the buzzer circuit and the micro-control unit are powered by the same power supply. In this embodiment, the buzzer circuit and the micro-control unit are powered by the same power supply, and the buzzer is controlled by the triode in the buzzer circuit, so that the driving voltage at two ends of the buzzer is amplified, and the effect of increasing the maximum volume of the buzzer under the condition of not additionally increasing the power supply is achieved.
Optionally, the micro control unit is further configured to adjust the frequency of the driving signal, wherein the frequency is adjusted in a range of 300hz to 10khz. In this embodiment, on the basis of increasing the maximum sound volume of the buzzer, the sound volume is increased and decreased by adjusting the frequency of the driving signal.
Optionally, the micro control unit is further configured to adjust a duty cycle of the driving signal, wherein an adjustment range of the duty cycle is 1% -50%. In this embodiment, on the basis of increasing the maximum sound volume of the buzzer, the sound volume is increased and decreased by adjusting the duty ratio of the driving signal.
Optionally, the device body further comprises a housing, wherein the buzzer circuit is disposed inside the housing. In the embodiment, as the maximum volume of the buzzer circuit is increased, the prompt tone can be effectively transmitted for the electrical equipment with higher tightness requirement, and the volume requirement of the product on the prompt tone is met.
According to another aspect of the present utility model, a cooking apparatus is provided. The cooking apparatus includes: a buzzer circuit; the cooker comprises a cooker body and a cooker cover arranged at the top of the cooker body, wherein the cooker cover is used for sealing the cooker body; the micro-control unit is in communication connection with the pot body and the buzzer circuit and is used for controlling the pot body to work and also used for providing a driving signal for the buzzer circuit, wherein the buzzer circuit and the micro-control unit are powered by the same power supply. In the cooking equipment, the buzzer is controlled through the triode, so that the driving voltage at two ends of the buzzer is amplified, the effect of improving the maximum volume of the prompting sound of the cooking equipment under the condition of not additionally increasing the power supply is achieved, and the product applying the technology is more friendly to the aged user.
Optionally, the buzzer circuit is arranged inside the pot body. In this embodiment, the maximum volume of the buzzer circuit is increased, so that the prompt sound can be effectively transmitted from the inside of the pot body to the outside of the pot body, and the volume requirement of the product on the prompt sound is met.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:
fig. 1 is a schematic diagram of a buzzer circuit provided in accordance with an embodiment of the present utility model;
FIG. 2 is a schematic diagram I of an alternative buzzer circuit provided in accordance with an embodiment of the present utility model;
FIG. 3 is a schematic diagram II of an alternative buzzer circuit provided in accordance with an embodiment of the present utility model;
fig. 4 is a schematic view of an electrical device provided according to an embodiment of the present utility model;
fig. 5 is a schematic diagram of an internal circuit of an electrical device according to an embodiment of the present utility model;
fig. 6 is a schematic view of a cooking apparatus provided according to an embodiment of the present utility model;
wherein, 10, a buzzer circuit; 20. a micro control unit; 30. an equipment body; 301. a pot body; 302. a pot cover;
H. a buzzer; q1, triode; r1, a first resistor; r2, a second resistor; r3, a third resistor; r4, a fourth resistor; c1, a first capacitor.
Detailed Description
It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.
In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the utility model herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
For convenience of description, the following will describe some terms or terminology involved in the embodiments of the present utility model:
a buzzer: an electronic sounder with an integrated structure adopts direct-current voltage power supply and is widely applied to various electronic products as a sounding device.
According to an embodiment of the present utility model, there is provided a buzzer circuit.
Fig. 1 is a schematic diagram of a buzzer circuit according to an embodiment of the present utility model. As shown in fig. 1, the buzzer circuit includes:
the first end of the buzzer H is used for being connected with a signal source, the second end of the buzzer H is connected with a power line, the buzzer is a passive buzzer, the signal source is used for generating a driving signal, and the signal source and the buzzer are powered by the same power supply.
It should be noted that, there is no oscillation source in the passive buzzer, and the driving signal is required to be driven by a driving signal, and the driving signal generated by the signal source in this embodiment is a square wave signal, and the square wave signal is converted into a sound signal after being input into the buzzer H and output.
And a base electrode of the triode Q1 is connected with the first end of the buzzer H, a collector electrode of the triode Q1 is connected with a power line, and an emitter electrode of the triode Q1 is connected with a ground wire.
It should be noted that, in the process of driving the buzzer H by the driving signal, when the voltage at the first end of the buzzer H is smaller than the conducting voltage of the triode Q1, the triode Q1 is not conducting, and the voltage at both ends of the buzzer H is equal to the difference between the power supply voltage of the power supply line VCC and the voltage at the first end of the buzzer H; when the voltage at the first end of the buzzer H is greater than the conducting voltage of the triode Q1, the triode Q1 is conducted, and the voltage at the two ends of the buzzer H is approximately equal to the difference between 0.7V and the voltage at the first end of the buzzer H. Therefore, in driving the buzzer H by the driving signal, the driving voltage across the buzzer H is greater than the power supply voltage.
That is, the present embodiment controls the buzzer H with the transistor Q1, so that the driving voltage at both ends of the buzzer H is amplified, and the maximum sound volume of the buzzer H is increased.
The first resistor R1 is connected in series between the second end of the buzzer H and the power line. The first resistor R1 damages the transistor Q1 to prevent the overcurrent.
The second resistor R2 is connected in series between the first end of the buzzer H and the base electrode of the triode Q1. The second resistor R2 is used to make the voltage of the first end of the buzzer H not affected by the transistor Q1.
Optionally, in the buzzer circuit provided in the embodiment of the present utility model, the buzzer circuit further includes: and the third resistor R3 is connected in parallel with two ends of the base electrode and the emitter electrode of the triode Q1. The third resistor R3 is used for stabilizing the voltage of the base electrode of the triode Q1.
Optionally, in the buzzer circuit provided in the embodiment of the present utility model, the buzzer circuit further includes: and the protection element is arranged between the first end of the buzzer H and the signal source. The protection element is used for protecting the input end of the buzzer circuit.
Optionally, in the buzzer circuit provided in the embodiment of the present utility model, the protection element is a capacitor or a resistor.
Fig. 2 is a schematic diagram of an alternative buzzer circuit provided according to an embodiment of the present utility model, as shown in fig. 2, using a first capacitor C1 as a protection element:
in fig. 2, a first end of the buzzer H is denoted as a point a, a second end of the buzzer H is denoted as a point B, and VCC is 5V as an example, a signal source inputs a pulse signal with 5V amplitude through an input end of the buzzer circuit, and after passing through the first capacitor C1, a driving signal waveform of ±2.5v is generated at the point a of the buzzer H without considering the partial voltage of the first capacitor C1.
When the voltage at the point A is-2.5V, the triode Q1 is not conducted, and the voltage at the two ends of the buzzer (the voltage between the point B and the point A) is about 7.5V; when the voltage of the point A is 2.5V, the triode Q1 is conducted, the voltage of the point B of the buzzer H is about 0.7V, the voltage of the two ends of the buzzer (the voltage between the point B and the point A) is about-1.8V, so that a driving voltage of about 9.3V can be generated at the two ends of the buzzer H (between the point B and the point A), and the maximum volume of the buzzer H is increased under the condition that the power supply of the buzzer H is not additionally increased.
Fig. 3 is a schematic diagram two of an alternative buzzer circuit provided according to an embodiment of the present utility model, as shown in fig. 3, using a fourth resistor R4 as a protection element:
in fig. 3, the first end of the buzzer H is denoted as point a, the second end of the buzzer H is denoted as point B, and VCC is 5V as an example, a signal source inputs a pulse signal with 5V amplitude through the input end of the buzzer circuit, and after passing through the fourth resistor R4, a driving signal waveform with 0-5V is generated at point a of the buzzer H without considering the partial voltage of the fourth resistor R4.
When the voltage at the point A is 0V, the triode Q1 is not conducted, and the voltage at the two ends of the buzzer (the voltage between the point B and the point A) is about 5V; when the voltage of the point A is 5V, the triode Q1 is conducted, the voltage of the point B of the buzzer H is about 0.7V, and the voltage of the two ends of the buzzer (the voltage between the point B and the point A) is about-4.3V, so that a driving voltage of about 9.3V can be generated on the two ends of the buzzer H (between the point B and the point A), and the maximum volume of the buzzer H is increased under the condition that the power supply of the buzzer H is not additionally increased.
According to the buzzer circuit provided by the embodiment of the utility model, through the buzzer H, the first end of the buzzer H is used for being connected with a signal source, the second end of the buzzer H is connected with a power line, wherein the buzzer is a passive buzzer, the signal source is used for generating a driving signal, and the signal source and the buzzer are powered by the same power supply; the base electrode of the triode Q1 is connected with the first end of the buzzer H, the collector electrode of the triode Q1 is connected with a power line, and the emitter electrode of the triode Q1 is connected with a ground wire; the first resistor R1 is connected in series between the second end of the buzzer H and the power line; the second resistor R2 is connected in series between the first end of the buzzer H and the base electrode of the triode Q1, and the problems of complex circuit and high cost caused by increasing the volume of the buzzer in a power supply mode in the related art are solved. The buzzer is controlled through the triode, so that the driving voltage at two ends of the buzzer is amplified, and the effect of improving the maximum volume of the buzzer under the condition of not additionally increasing a power supply is achieved.
The embodiment of the utility model also provides electrical equipment.
Fig. 4 is a schematic diagram of an electrical device according to an embodiment of the utility model. Fig. 5 is a schematic diagram of an internal circuit of an electrical device according to an embodiment of the present utility model. As shown in fig. 4 and 5, the electrical apparatus includes:
the buzzer circuit 10 in the above embodiment.
A micro control unit 20 and an apparatus body 30; the micro-control unit 20 is connected with the device body 30 and the buzzer circuit 10, and is used for controlling the device body 30 to work and also for providing a driving signal for the buzzer circuit 10, wherein the buzzer circuit 10 and the micro-control unit 20 are powered by the same power supply.
Specifically, since the buzzer H in the buzzer circuit 10 is a passive buzzer, the driving signal generated by the micro control unit 20 is a square wave signal, the passive buzzer is driven by the square wave signal, and the micro control unit 20 can directly output the square wave signal through the PWM output port, or can generate the square wave signal by using the I/O timing flip level.
It should be noted that, in this embodiment, the buzzer circuit 10 and the micro-control unit 20 are powered by the same power supply, the buzzer circuit 10 uses the triode Q1 to control the buzzer H, and under the condition that no additional power supply is provided, the driving voltages at two ends of the buzzer H are amplified, and the maximum volume of the buzzer H is increased.
Optionally, in the electrical device provided by the embodiment of the present utility model, the micro control unit 20 is further configured to adjust a frequency of the driving signal, where the frequency is adjusted within a range of 300hz to 10khz.
Optionally, in the electrical apparatus provided in the embodiment of the present utility model, the micro control unit 20 is further configured to adjust a duty cycle of the driving signal, where an adjustment range of the duty cycle is 1% -50%.
Specifically, the volume can be increased and decreased by adjusting the frequency or the duty ratio of the driving signal, on the premise that the driving voltage at two ends of the buzzer H is amplified to promote the maximum volume of the buzzer H, the volume adjusting range is wider, so that the electrical equipment is applicable to different use scenes, for example, when the environment is quite and the electrical equipment is close to a user, the volume is decreased by adjusting the frequency or the duty ratio of the driving signal, electric energy can be saved, and other people except the user of the electrical equipment are prevented from being influenced by the prompting sound; under the condition that the environment is noisy or the electrical equipment is far away from the user, the volume is increased by adjusting the frequency or the duty ratio of the driving signal, so that the user can hear the prompt tone.
Optionally, in the electrical apparatus provided in the embodiment of the present utility model, the apparatus body 30 further includes a housing, wherein the buzzer circuit 10 is disposed inside the housing. It should be noted that, in an electrical apparatus with a high requirement on tightness, for example, in an electrical apparatus with a high dustproof and waterproof level, it is difficult to effectively spread a prompt tone by forming a hole in a housing, and in a small electrical apparatus with a high requirement on the volume of the apparatus, it is difficult to increase the driving voltage of a wind buzzer by adding a power supply.
The electrical equipment provided by the embodiment of the utility model comprises a buzzer circuit 10; a micro control unit 20 and an apparatus body 30; the micro control unit 20 is connected with the device body 30 and the buzzer circuit 10, and is used for controlling the device body 30 to work and further used for providing a driving signal for the buzzer circuit 10, wherein the buzzer circuit 10 and the micro control unit 20 are powered by the same power supply, and the buzzer is controlled by the triode in the buzzer circuit of the electrical device, so that the driving voltage at two ends of the buzzer is amplified, the problems that the circuit is complex and the cost is high due to the fact that the volume of the buzzer is increased by increasing the power supply in the related art are solved, and the effect of improving the maximum volume of the prompting sound of the electrical device under the condition that the power supply is not additionally increased are further achieved.
Fig. 6 is a schematic view of a cooking apparatus according to an embodiment of the present utility model. As shown in fig. 6, the cooking apparatus includes:
a buzzer circuit 10; a pot body 301, and a pot cover 302 arranged on the top of the pot body 301, wherein the pot cover 302 is used for sealing the pot body 301; the control panel is arranged on the pot body 301, a micro control unit 20 is arranged in the control panel, the micro control unit 20 is in communication connection with the pot body 301 and the buzzer circuit 10 and is used for controlling the pot body 301 to work and also used for providing a driving signal for the buzzer circuit 10, and the buzzer circuit 10 and the micro control unit 20 are powered by the same power supply.
The micro control unit 20 is a general controller of the cooking device, and not only can control the cooking operation, but also can set the starting condition of the buzzer circuit 10 in the micro control unit 20, and when the starting condition of the buzzer circuit 10 is reached, the micro control unit 20 outputs a driving signal to control the buzzer circuit 10 to work.
It should be noted that, in the use process of the cooking device, the sound of the cooking food easily affects the propagation of the prompt tone, and the noise in the noisy environment easily affects the propagation of the prompt tone, for example, the working sound of the range hood in the kitchen environment where the range hood is opened, in a small product with high equipment volume requirement, the driving voltage of the wind buzzer is difficult to be increased in a mode of adding a power supply, and the maximum volume of the buzzer in the buzzer circuit 10 can be increased without adding a power supply by adopting the buzzer circuit 10 of the embodiment, so that the cooking device is more suitable for the noisy environment with background noise, and the prompt tone can be effectively propagated in the cooking process, thereby meeting the volume requirement of a user on the prompt tone.
Optionally, the buzzer circuit 10 is arranged inside the pot 301. In this embodiment, the maximum volume of the buzzer circuit is increased, so that the prompt sound can be effectively transmitted from the interior of the pot 301 to the exterior of the pot, and the volume requirement of the product on the prompt sound is met.
The cooking equipment provided by the embodiment of the utility model is provided with the buzzer circuit 10; a pot body 301, and a pot cover 302 arranged on the top of the pot body 301, wherein the pot cover 302 is used for sealing the pot body 301; the control panel is arranged on the pot body 301, the micro control unit 20 is arranged in the control panel, the micro control unit 20 is in communication connection with the pot body 301 and the buzzer circuit 10 and is used for controlling the pot body 301 to work and also used for providing driving signals for the buzzer circuit 10, wherein the buzzer circuit 10 and the micro control unit 20 are powered by the same power supply, the problems that in the related art, the circuit is complex and the cost is high due to the fact that the volume of the buzzer is increased by increasing the power supply are solved, in the buzzer circuit of the cooking equipment, the buzzer is controlled through the triode, the driving voltage at two ends of the buzzer is amplified, and then the effect of improving the maximum volume of the buzzer under the condition that the power supply is not additionally increased is achieved.
The foregoing is merely exemplary of the present utility model and is not intended to limit the present utility model. Various modifications and variations of the present utility model will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are to be included in the scope of the claims of the present utility model.
Claims (10)
1. A buzzer circuit, comprising:
the buzzer (H) is used for generating a driving signal, and the signal source and the buzzer (H) are powered by the same power supply;
the base electrode of the triode (Q1) is connected with the first end of the buzzer (H), the collector electrode of the triode (Q1) is connected with the power line, and the emitter electrode of the triode (Q1) is connected with the ground wire;
a first resistor (R1) connected in series between the second end of the buzzer (H) and the power line;
and a second resistor (R2) connected in series between the first end of the buzzer (H) and the base electrode of the triode (Q1).
2. The buzzer circuit of claim 1, further comprising:
and the third resistor (R3) is connected in parallel with two ends of the base electrode and the emitter electrode of the triode (Q1).
3. The buzzer circuit of claim 1, further comprising:
and a protection element arranged between the first end of the buzzer (H) and the signal source.
4. A buzzer circuit in accordance with claim 3, wherein the protection element is a capacitor or resistor.
5. An electrical device, comprising:
a buzzer circuit (10) as claimed in any one of claims 1 to 4;
a micro control unit (20) and an apparatus body (30);
the micro-control unit (20) is connected with the equipment body (30) and the buzzer circuit (10) and is used for controlling the equipment body (30) to work and also used for providing a driving signal for the buzzer circuit (10), wherein the buzzer circuit (10) and the micro-control unit (20) are powered by the same power supply.
6. The electrical device according to claim 5, wherein the micro control unit (20) is further adapted to adjust the frequency of the driving signal, wherein the frequency is adjusted in the range of 300hz-10khz.
7. The electrical device according to claim 5, wherein the micro-control unit (20) is further configured to adjust a duty cycle of the driving signal, wherein the duty cycle is adjusted in a range of 1% -50%.
8. The electrical device according to claim 5, wherein the device body (30) further comprises a housing, wherein the buzzer circuit (10) is arranged inside the housing.
9. A cooking apparatus, comprising:
a buzzer circuit (10) as claimed in any one of claims 1 to 4;
a pot body (301), and a pot cover (302) arranged on the top of the pot body (301), wherein the pot cover (302) is used for sealing the pot body (301);
the micro-control unit (20), micro-control unit (20) with the pot body (301) and buzzer circuit (10) communication connection is used for controlling the work of the pot body (301), still is used for buzzer circuit (10) provides drive signal, wherein, buzzer circuit (10) with micro-control unit (20) adopts same power supply.
10. Cooking apparatus according to claim 9, characterized in that the buzzer circuit (10) is arranged inside the pot (301).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321861245.4U CN220553292U (en) | 2023-07-14 | 2023-07-14 | Buzzer circuit, electrical equipment and cooking equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321861245.4U CN220553292U (en) | 2023-07-14 | 2023-07-14 | Buzzer circuit, electrical equipment and cooking equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220553292U true CN220553292U (en) | 2024-03-01 |
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ID=90007284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321861245.4U Active CN220553292U (en) | 2023-07-14 | 2023-07-14 | Buzzer circuit, electrical equipment and cooking equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220553292U (en) |
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2023
- 2023-07-14 CN CN202321861245.4U patent/CN220553292U/en active Active
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