Buzzer and driving circuit thereof

Abstract

The utility model provides a buzzer and a driving circuit thereof, and the driving circuit comprises a direct current voltage stabilization assembly which is used for outputting direct current; the input end of the PWM voltage regulating assembly is connected with the direct current voltage stabilizing assembly, and the PWM voltage regulating assembly is used for outputting adjustable voltage according to the direct current; the input end of the voltage sampling assembly is connected with the output end of the PWM voltage regulating assembly, and the voltage sampling assembly is used for collecting adjustable voltage; the single chip microcomputer is connected with the control end of the PWM voltage regulating assembly and the output end of the voltage sampling assembly and used for conducting AD sampling on the adjustable voltage collected by the voltage sampling assembly and regulating PWM signals output to the control end of the PWM voltage regulating assembly according to the adjustable voltage so as to regulate the adjustable voltage output by the PWM voltage regulating assembly; the input end of the H-bridge driving assembly is connected with the output end of the voltage sampling assembly, the output end is connected with the buzzer, and the control end is connected with the single-chip microcomputer. According to the utility model, voltage changes can be responded, so that the buzzer generates adjustable and stable audio signals to adapt to requirements of different occasions.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronics, in particular to a buzzer and a driving circuit thereof. Background Art

[0002] In electric two-wheeled vehicles and other vehicles, buzzers are often used as sound warning devices in instruments and alarm systems.

[0003] However, in the related art, the buzzer driving circuit is often directly powered by the vehicle battery, and its sound volume will change with the fluctuation of the battery voltage. In particular, when the battery power is low, the sound is weakened, affecting the warning effect. Therefore, how to provide a piezoelectric buzzer driving circuit that can independently adjust the sound volume and keep the sound constant has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a driving circuit for a buzzer.

[0005] The utility model also provides a buzzer.

[0006] The technical solution adopted by the utility model is as follows:

[0007] The utility model proposes a driving circuit of a buzzer, comprising: a DC voltage stabilizing component, the DC voltage stabilizing component is used to output DC power; a PWM (Pulse Width Modulation) voltage regulating component, the input end of the PWM voltage regulating component is connected to the DC voltage stabilizing component, the PWM voltage regulating component is used to output an adjustable voltage according to the DC power; a voltage sampling component, the input end of the voltage sampling component is connected to the output end of the PWM voltage regulating component, the voltage sampling component is used to collect the adjustable voltage output by the PWM voltage regulating component; a single-chip microcomputer, the single-chip microcomputer is connected to the control end of the PWM voltage regulating component and the output end of the voltage sampling component, the single-chip microcomputer is used to perform AD (Analog to Ana ... Digital (A / D) sampling, and adjusting the PWM signal output to the control end of the PWM voltage regulating component according to the adjustable voltage, so as to adjust the adjustable voltage output by the PWM voltage regulating component; an H-bridge driving component, the input end of the H-bridge driving component is connected to the output end of the voltage sampling component, the output end of the H-bridge driving component is connected to the buzzer, the control end of the H-bridge driving component is connected to the single-chip microcomputer, and the H-bridge driving component is used to drive the buzzer to generate an adjustable audio signal according to the adjustable voltage and the driving signal of the single-chip microcomputer.

[0008] The driving circuit of the electric buzzer of the utility model also has the following additional technical features:

[0009] Specifically, the PWM voltage regulation component includes: a first transistor, the emitter of the first transistor is connected to the output end of the DC voltage stabilization component; a first resistor, the first resistor is connected between the base and the emitter of the first transistor; a second transistor, the collector of the second transistor is connected to the base of the first transistor, the base of the second transistor is connected to the single-chip microcomputer through a second resistor, and the emitter of the second transistor is grounded; a first electrolytic capacitor, the first electrolytic capacitor is connected between the collector of the first transistor and the emitter of the second transistor.

[0010] Specifically, the voltage sampling component includes: a third resistor, one end of the third resistor is connected to the output end of the PWM voltage regulation component; a fourth resistor, one end of the fourth resistor is connected to the other end of the third resistor, and there is a first connection point between the other end of the third resistor and one end of the fourth resistor, the first connection point is connected to the single-chip microcomputer as the output end of the voltage sampling component, and the other end of the fourth resistor is grounded; a second capacitor, one end of the second capacitor is connected to the first connection point, and the second end of the second capacitor is grounded.

[0011] Specifically, the H-bridge driving component includes: a third triode, the emitter of the third triode is connected to the output end of the PWM voltage regulating component through a fifth resistor; a fourth triode, the collector of the fourth triode is connected to the collector of the third triode, and there is a second connection point between the collector of the third triode and the collector of the fourth triode, the second connection point is connected to the positive input end of the buzzer, and the emitter of the fourth triode is grounded; a fifth triode, the emitter of the fifth triode is connected to the emitter of the third triode The emitter of the sixth triode is connected; the collector of the sixth triode is connected to the collector of the fifth triode, and there is a third connection point between the collectors of the fifth triode and the sixth triode, the third connection point is connected to the negative input terminal of the buzzer, and the emitter of the sixth triode is grounded; the bases of the third triode, the fourth triode, the fifth triode and the sixth triode are respectively connected to the single-chip microcomputer through the sixth resistor, the seventh resistor, the eighth resistor and the ninth resistor to receive the driving signal of the single-chip microcomputer.

[0012] Specifically, the buzzer is a piezoelectric ceramic piece.

[0013] The utility model also provides a buzzer, comprising the driving circuit of the buzzer mentioned above.

[0014] Beneficial effects of the utility model:

[0015] The utility model can respond to voltage changes to enable the buzzer to generate an adjustable and stable audio signal to meet the needs of different occasions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a buzzer driving circuit according to an embodiment of the utility model;

[0017] Figure 2 It is a circuit topology diagram of a buzzer driving circuit according to an embodiment of the utility model. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] Figure 1 : is a schematic diagram of the structure of a buzzer driving circuit according to an embodiment of the utility model. Figure 1 As shown, the driving circuit includes: a DC voltage stabilizing component 1, a PWM voltage regulating component 2, a voltage sampling component 3, a single chip microcomputer 4 and an H-bridge driving component 5.

[0020] Among them, the DC voltage regulator component 1 is used to output DC power VCC; the input end of the PWM voltage regulator component 2 is connected to the DC voltage regulator component 1, and the PWM voltage regulator component 2 is used to output an adjustable voltage according to the DC power VCC; the input end of the voltage sampling component 3 is connected to the output end of the PWM voltage regulator component 2, and the voltage sampling component 3 is used to collect the adjustable voltage output by the PWM voltage regulator component; the single-chip computer 4 is connected to the control end of the PWM voltage regulator component 2 and the output end of the voltage sampling component 3, and the single-chip computer 4 is used to perform AD sampling on the adjustable voltage collected by the voltage sampling component 3, and adjust the PWM signal output to the control end of the PWM voltage regulator component 3 according to the adjustable voltage, so as to adjust the adjustable voltage output by the PWM voltage regulator component 2; the input end of the H-bridge driving component 5 is connected to the output end of the voltage sampling component 2, the output end of the H-bridge driving component 5 is connected to the buzzer 6, the control end of the H-bridge driving component 5 is connected to the single-chip computer 4, and the H-bridge driving component 6 is used to drive the buzzer to generate an adjustable audio signal according to the adjustable voltage and the driving signal of the single-chip computer.

[0021] Specifically, the DC voltage regulator component 1 can use a high-efficiency DC-DC (direct current-direct current) converter, the input is the vehicle battery voltage, and the output is a preset DC power VCC, such as 5V or 124V. The PWM voltage regulator component 2 adjusts the DC power VCC according to the PWM signal of the single-chip microcomputer and outputs an adjustable voltage. The H-bridge driving component 5 drives the buzzer to generate an adjustable audio signal according to the adjustable voltage and the driving signal of the single-chip microcomputer. The voltage sampling component 3 can collect the adjustable voltage output by the PWM voltage regulator component 2 and feed it back to the single-chip microcomputer 4, so that the single-chip microcomputer 4 adjusts the PWM signal according to the real-time collected voltage regulation, dynamically adjusts the PWM pulse width, ensures that the output voltage is close to the target voltage, and ensures output stability. The user can send user instructions through a knob or a digital interface according to actual needs, so that the single-chip microcomputer adjusts the PWM signal and changes the adjustable voltage output by the PWM voltage regulator component 2, thereby adjusting the volume of the buzzer. In this way, the buzzer can respond to voltage changes and generate an adjustable and stable audio signal to meet the needs of different occasions.

[0022] In one embodiment of the present invention, Figure 2 As shown, the PWM voltage regulation component 2 may include: a first transistor Q1, a first resistor R1, a second transistor Q2 and a first electrolytic capacitor C1.

[0023] Wherein, the emitter of the first transistor Q1 is connected to the output end of the DC voltage stabilizing component 1;

[0024] The first resistor R1 is connected between the base and emitter of the first transistor Q1; the collector of the second transistor Q2 is connected to the base of the first transistor Q1, the base of the second transistor Q2 is connected to the single-chip computer 4 through the second resistor R2, and the emitter of the second transistor Q2 is grounded; the first electrolytic capacitor C1 is connected between the collector of the first transistor Q1 and the emitter of the second transistor Q2.

[0025] Specifically, the duty cycle of Q2 is adjusted through the PWM signal to reduce the voltage of VCC, and then C1 is used for filtering. The rapidly changing pulses will be smoothed and converted into a more stable DC voltage.

[0026] In one embodiment of the present invention, Figure 2 As shown, the voltage sampling component 3 includes: a third resistor R3, a fourth resistor R4 and a second capacitor C2.

[0027] Among them, one end of the third resistor R3 is connected to the output end of the PWM voltage regulating component 2; one end of the fourth resistor R4 is connected to the other end of the third resistor R3, and there is a first connection point between the other end of the third resistor R3 and one end of the fourth resistor R4, the first connection point is connected to the microcontroller 4 as the output end of the voltage sampling component, and the other end of the fourth resistor is grounded; one end of the second capacitor C2 is connected to the first connection point, and the second end of the second capacitor C2 is grounded.

[0028] Specifically, the voltage sampling component 3 performs voltage division sampling on the adjustable voltage output by the PWM voltage regulating component 2, and then the single chip microcomputer performs AD sampling calculation to obtain the voltage after voltage regulation, and dynamically adjusts the pulse width of the PWM signal to make the adjustable voltage close to the target voltage.

[0029] In one embodiment of the present invention, Figure 2 As shown, the H-bridge driving component 5 may include: a third transistor Q3, a fourth transistor Q4, a fifth transistor Q5 and a sixth transistor Q6.

[0030] The emitter of the third triode Q3 is connected to the output end of the PWM voltage regulating component 2 through the fifth resistor R5; the collector of the fourth triode Q4 is connected to the collector of the third triode Q3, and there is a second connection point between the collector of the third triode Q3 and the collector of the fourth triode Q4, the second connection point is connected to the positive input end of the buzzer 6, and the emitter of the fourth triode Q4 is grounded; the emitter of the fifth triode Q5 is connected to the emitter of the third triode Q2; the collector of the sixth triode Q6 is connected to the collector of the third triode Q3; and the collector of the fourth triode Q4 is connected to the positive input end of the buzzer 6. The electrode is connected to the collector of the fifth triode Q5, and there is a third connection point between the collectors of the fifth triode Q5 and the sixth triode Q6, the third connection point is connected to the negative input terminal of the buzzer 6, and the emitter of the sixth triode Q6 is grounded; the bases of the third triode Q3, the fourth triode Q4, the fifth triode Q5 and the sixth triode Q6 are respectively connected to the single-chip computer 4 through the sixth resistor R6, the seventh resistor R7, the eighth resistor R8 and the ninth resistor R9 to receive the driving signal of the single-chip computer 4.

[0031] Specifically, the third transistor Q3 and the fifth transistor Q5 are PNP transistors, and the fourth transistor Q4 and the sixth transistor Q6 are NPN transistors. When the buzzer needs to be driven, A+ and B+ are first set to low, B- and A- are set to high, Q3 and Q6 are turned on, Q4 and Q5 are turned off, and a positive voltage is given to the buzzer for half a cycle. Then, B- and A- are set to low, A+ and B+ are set to high, Q4 and Q5 are turned on, Q3 and Q6 are turned off, and the voltage across the buzzer is reversed, giving the buzzer a negative voltage, which also lasts for half a cycle. Repeating the process over and over again, a square wave is formed. By adjusting the drive signal cycle and duty cycle, a sound of a specific frequency can be formed on the buzzer.

[0032] In the embodiment of the utility model, the buzzer can be a piezoelectric ceramic piece.

[0033] In summary, according to the driving circuit of the buzzer of the embodiment of the utility model, the DC voltage regulator component outputs the DC power VCC, the input end of the PWM voltage regulator component is connected to the DC voltage regulator component, the PWM voltage regulator component outputs an adjustable voltage according to the DC power VCC, the input end of the voltage sampling component is connected to the output end of the PWM voltage regulator component, the voltage sampling component collects the adjustable voltage output by the PWM voltage regulator component, the single-chip microcomputer is connected to the control end of the PWM voltage regulator component and the output end of the voltage sampling component, the single-chip microcomputer is used to perform AD sampling on the adjustable voltage collected by the voltage sampling component, and adjust the PWM signal output to the control end of the PWM voltage regulator component according to the adjustable voltage to adjust the adjustable voltage output by the PWM voltage regulator component, the input end of the H-bridge driving component is connected to the output end of the voltage sampling component, the output end of the H-bridge driving component is connected to the buzzer, the control end of the H-bridge driving component is connected to the single-chip microcomputer, and the H-bridge driving component drives the buzzer to generate an adjustable audio signal according to the adjustable voltage and the driving signal of the single-chip microcomputer. Thus, the buzzer can generate an adjustable and stable audio signal in response to voltage changes to meet the needs of different occasions.

[0034] In addition, the utility model also provides a buzzer, including the driving circuit of the buzzer mentioned above.

[0035] The buzzer according to the embodiment of the utility model can respond to voltage changes through the above-mentioned buzzer driving circuit, so that the buzzer generates an adjustable and stable audio signal to meet the needs of different occasions.

[0036] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0039] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A buzzer driving circuit, characterized in that: include: A DC voltage stabilizing component, the DC voltage stabilizing component is used to output DC power; A PWM voltage regulating component, wherein the input end of the PWM voltage regulating component is connected to the DC voltage stabilizing component, and the PWM voltage regulating component is used to output an adjustable voltage according to the DC power; A voltage sampling component, the input end of which is connected to the output end of the PWM voltage regulating component, and the voltage sampling component is used to collect the adjustable voltage output by the PWM voltage regulating component; A single-chip microcomputer, the single-chip microcomputer is connected to the control end of the PWM voltage regulating component and the output end of the voltage sampling component, the single-chip microcomputer is used to perform AD sampling on the adjustable voltage collected by the voltage sampling component, and adjust the PWM signal output to the control end of the PWM voltage regulating component according to the adjustable voltage, so as to adjust the adjustable voltage output by the PWM voltage regulating component; An H-bridge driving component, wherein the input end of the H-bridge driving component is connected to the output end of the voltage sampling component, the output end of the H-bridge driving component is connected to the buzzer, the control end of the H-bridge driving component is connected to the single-chip microcomputer, and the H-bridge driving component is used to drive the buzzer to generate an adjustable audio signal according to the adjustable voltage and the driving signal of the single-chip microcomputer.

2. The buzzer driving circuit according to claim 1, characterized in that: The PWM voltage regulation component comprises: A first triode, wherein the emitter of the first triode is connected to the output end of the DC voltage stabilizing component; a first resistor, wherein the first resistor is connected between a base and an emitter of the first transistor; a second triode, wherein the collector of the second triode is connected to the base of the first triode, the base of the second triode is connected to the single chip microcomputer via a second resistor, and the emitter of the second triode is grounded; A first electrolytic capacitor is connected between the collector of the first transistor and the emitter of the second transistor.

3. The buzzer driving circuit according to claim 1, characterized in that: The voltage sampling component comprises: A third resistor, one end of which is connected to the output end of the PWM voltage regulating component; a fourth resistor, one end of the fourth resistor being connected to the other end of the third resistor, and a first connection point being provided between the other end of the third resistor and one end of the fourth resistor, the first connection point being connected to the single-chip microcomputer as an output end of the voltage sampling component, and the other end of the fourth resistor being grounded; A second capacitor, one end of the second capacitor is connected to the first connection point, and a second end of the second capacitor is grounded.

4. The buzzer driving circuit according to claim 1, characterized in that: The H-bridge driving component comprises: A third triode, the emitter of which is connected to the output end of the PWM voltage regulating component via a fifth resistor; a fourth triode, wherein the collector of the fourth triode is connected to the collector of the third triode, and a second connection point is provided between the collector of the third triode and the collector of the fourth triode, the second connection point is connected to the positive input terminal of the buzzer, and the emitter of the fourth triode is grounded; a fifth triode, wherein the emitter of the fifth triode is connected to the emitter of the third triode; a sixth triode, wherein the collector of the sixth triode is connected to the collector of the fifth triode, and a third connection point is provided between the collectors of the fifth triode and the sixth triode, the third connection point is connected to the negative input terminal of the buzzer, and the emitter of the sixth triode is grounded; The bases of the third transistor, the fourth transistor, the fifth transistor and the sixth transistor are respectively connected to the single chip microcomputer through a sixth resistor, a seventh resistor, an eighth resistor and a ninth resistor to receive a driving signal of the single chip microcomputer.

5. The buzzer driving circuit according to any one of claims 1 to 4, characterized in that: The buzzer is a piezoelectric ceramic piece.

6. A buzzer, characterized in that: A driving circuit comprising the buzzer according to any one of claims 1 to 5.

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