Buzzer volume adjustable control circuit based on man-machine interface display screen

Abstract

The utility model provides a buzzer volume adjustable control circuit based on a man-machine interface display screen, and the circuit comprises a first signal source which is used for providing a PWM signal; the logic chip comprises a first input end, at least one second input end and at least one output end; wherein the first input end is connected to the output end of the first signal source, and each second input end is connected to an independent second signal source; the grid electrode of the field effect transistor is connected to the output end of the logic chip, the source electrode is connected to the ground, and the drain electrode is connected to the negative electrode of the buzzer; and the positive electrode of the buzzer is connected to the positive electrode of the power supply circuit. According to the invention, a logic chip is introduced into the control circuit, so that coordinated control of multiple signal sources is realized. The logic chip performs logic operation according to different input signals, so that the buzzer can flexibly respond according to different conditions or combinations, the flexibility of volume control of the buzzer and the stability of the circuit are improved, and the circuit adapts to various working environments and requirements.

Description

Technical Field

[0001] This utility model relates to the field of circuit control technology, and in particular to a buzzer volume adjustable control circuit based on a human-machine interface display screen. Background Technology

[0002] With the development of electronic technology, buzzers, as a common audio prompting device, have been widely used in various electronic devices. A buzzer is an integrated electronic sounder that uses DC voltage power and is widely used in electronic products such as computers, printers, copiers, alarms, electronic toys, automotive electronics, telephones, and timers as a sound-generating device.

[0003] Traditional adjustable buzzer volume control circuits typically consist of an input signal adjustment section, a transistor or MOSFET, a buzzer, and components such as capacitors, resistors, and diodes. Their working principle is to change the buzzer volume by adjusting the strength of the input signal.

[0004] However, existing buzzer control circuits have the following shortcomings:

[0005] 1. Single signal source control: In traditional circuits, the input signal is directly transmitted to the transistor or MOSFET, and the buzzer can only be directly controlled by a single signal source, which cannot meet the application scenarios that require multi-signal source control logic.

[0006] 2. Poor flexibility: Because it relies on a single signal source for control, the system has poor flexibility and adaptability, making it difficult to cope with complex usage environments and diverse user needs.

[0007] To address the aforementioned issues, this invention proposes a buzzer volume adjustable control circuit based on a human-machine interface display screen. This aims to overcome the shortcomings of existing technologies, achieve multi-signal source collaborative control, improve system flexibility and intelligence, and meet a wider range of application needs. Utility Model Content

[0008] The purpose of this invention is to solve the technical problem that buzzers in the prior art can only be directly controlled by a single signal source, and to provide a buzzer volume adjustable control circuit based on a human-machine interface display screen to realize multi-signal source coordinated control.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A buzzer volume adjustable control circuit based on a human-machine interface display screen includes:

[0011] The first signal source is used to provide the PWM signal;

[0012] A logic chip includes a first input terminal, at least one second input terminal, and at least one output terminal; wherein the first input terminal is connected to the output terminal of a first signal source, and each second input terminal is connected to an independent second signal source;

[0013] A field-effect transistor has its gate connected to the output terminal of a logic chip, its source connected to ground, and its drain connected to the negative terminal of a buzzer.

[0014] The buzzer's positive terminal is connected to the positive terminal of the power supply circuit;

[0015] The logic chip receives signal inputs from a first signal source and at least one second signal source. After internal logic operations, it outputs a control signal from the output terminal. The control signal controls the switching state of the field-effect transistor, thereby driving the buzzer to vibrate.

[0016] In a preferred embodiment, the first signal source includes a human-machine interface display screen for receiving volume adjustment commands set by the user and converting the volume adjustment commands into electrical signals that are input to the first input terminal of the logic chip.

[0017] In a preferred embodiment, the field-effect transistor is an N-channel MOSFET.

[0018] In a preferred embodiment, the logic chip includes, but is not limited to, logic gate circuits such as AND gates, OR gates, and NOR gates, used to implement logical operations and processing of multiple input signals.

[0019] In a preferred embodiment, the control circuit further includes a freewheeling diode, the positive terminal of which is connected to the drain of the field-effect transistor, and the negative terminal of which is connected to the positive terminal of the power supply circuit.

[0020] In a preferred embodiment, the control circuit further includes a filter capacitor, one end of which is connected to the positive terminal of the power supply circuit, and the other end is grounded.

[0021] In a preferred embodiment, the control circuit further includes a gate pull-down resistor, one end of which is connected to the gate of the field-effect transistor and the other end is grounded.

[0022] In a preferred embodiment, the control circuit further includes a pull-down resistor, one end of which is connected to the output terminal of the first signal source, and the other end is grounded.

[0023] Compared with the prior art, the technical solution of this utility model has the following beneficial effects:

[0024] This invention employs a first signal source and at least one second signal source, and incorporates a logic chip into the control circuit to achieve coordinated control of multiple signal sources. The logic chip can perform logical operations based on different input signals (such as PWM signals and other second signal sources), enabling the buzzer to respond flexibly according to different conditions or combinations, thereby improving the flexibility of buzzer volume control and the stability of the circuit, and adapting to various working environments and needs.

[0025] The primary signal source uses a human-machine interface display to generate a PWM signal. Users can intuitively and conveniently adjust the duty cycle of the PWM signal through the display, thereby controlling the buzzer's volume. This design simplifies the operation process, enhances the user experience, and is especially suitable for scenarios requiring frequent volume adjustments. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the adjustable buzzer volume control circuit based on the human-machine interface display screen in this embodiment.

[0028] Figure 2 This is a schematic diagram of the control signal waveform generated after the PWM signal and control signal are processed by the logic chip in Embodiment 2. Attached image description:

[0030] 1. First signal source (human-machine interface display screen); 2. Second signal source; 3. Logic chip; 4. Field-effect transistor; 5. Buzzer; 6. Freewheeling diode; 7. Gate pull-down resistor; 8. Pull-down resistor. Detailed Implementation

[0031] To make the above and other features and advantages of this utility model clearer, the utility model will be further described below with reference to the accompanying drawings. It should be understood that the specific embodiments given herein are for the purpose of explanation to those skilled in the art, and are exemplary only, not restrictive.

[0032] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", 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.

[0033] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] Example 1

[0035] To address the technical problem that buzzers in the prior art can only be directly controlled by a single signal source, this embodiment provides a buzzer volume adjustable control circuit based on a human-machine interface display screen.

[0036] See Figure 1 As shown, the buzzer volume adjustable control circuit based on the human-machine interface display screen provided in this embodiment includes: a first signal source 1, a logic chip 3, a field-effect transistor 4, a buzzer 5, a filter capacitor, a resistor, and a freewheeling diode 6.

[0037] The first signal source 1 is used to provide a PWM signal. In this embodiment, the first signal source 1 uses a human-machine interface display screen to generate the PWM signal, receive the volume adjustment command set by the user, and convert the volume adjustment command into an electrical signal input to the first input terminal of the logic chip 3. The user can intuitively and conveniently adjust the duty cycle of the PWM signal through the display screen, thereby controlling the volume of the buzzer 5. This design simplifies the operation process, improves the user experience, and is especially suitable for scenarios that require frequent volume adjustments.

[0038] The logic chip 3 includes a first input terminal, at least one second input terminal, and at least one output terminal. The first input terminal is connected to the output terminal of the first signal source 1 (human-machine interface display screen), and each second input terminal is connected to an independent second signal source 2. There can be one or more second signal sources 2, enabling coordinated control of multiple signal sources. The logic chip 3 can, based on different input signals (such as PWM signals and other second signal sources 2), perform logical operations (such as AND gates, OR gates, NOT gates, etc.) to make the buzzer 5 respond flexibly according to different conditions or combinations, improving the flexibility of the buzzer 5's volume control and the stability of the circuit, adapting to various working environments and needs.

[0039] Field-effect transistor 4 is an N-channel MOSFET. Its gate is connected to the output terminal of logic chip 3, its source is connected to ground, and its drain is connected to the negative terminal of buzzer 5. By adding logic chip 3 to the circuit, the gate of the MOSFET can receive a stable voltage signal, thereby stabilizing the voltage difference between the gate and the source, and thus precisely controlling the start and stop of buzzer 5.

[0040] Buzzer 5 has its positive terminal connected to the positive terminal of the power supply circuit, and its negative terminal connected to the drain of the field-effect transistor 4. The operating voltage of buzzer 5 is fixed, and the negative terminal of buzzer 5 is controlled by a MOSFET to achieve the start and stop control of buzzer 5.

[0041] In addition, the control circuit also includes the following components:

[0042] Freewheeling diode 6: The anode of freewheeling diode 6 is connected to the drain of the field-effect transistor 4, and the cathode is connected to the positive terminal of the power supply circuit. Since the buzzer 5 is essentially an inductive element, its current cannot change instantaneously. Therefore, a freewheeling diode 6 is necessary to provide freewheeling current. Otherwise, a voltage spike of tens of volts will be generated across the buzzer 5, which may damage the field-effect transistor 4 and interfere with other parts of the circuit.

[0043] Filter capacitor (not shown in the diagram): One end of the filter capacitor is connected to the positive terminal of the power supply circuit, and the other end is grounded. The function of the filter capacitor is to filter out the influence of the buzzer current on other parts, improve the AC impedance of the power supply, and enhance the stability of the circuit.

[0044] Gate pull-down resistor 7: One end of gate pull-down resistor 7 is connected to the gate of field-effect transistor 4, and the other end is grounded. This ensures that the gate voltage of the MOSFET remains low when there is no control signal, thereby keeping the MOSFET in the off state and improving the stability and anti-interference capability of the circuit.

[0045] Pull-down resistor 8: One end of pull-down resistor 8 is connected to the output terminal of the first signal source 1 (human-machine interface display screen), and the other end is grounded. This ensures that the output terminal remains at a low level when there is no valid signal and limits the current flowing into subsequent circuits, thus providing protection.

[0046] The working principle of this embodiment is as follows:

[0047] The human-machine interface display receives a user's command to adjust the volume. The CPU or MCU then issues a corresponding PWM signal. This PWM signal, along with a signal from the second signal source 2, is processed by logic chip 3 and drives the gate of a MOSFET. The MOSFET controls the negative terminal of buzzer 5, forming a circuit with the positive terminal of buzzer 5. When the PWM signal is high, the MOSFET conducts, energizing buzzer 5 and producing a sound. The function of logic chip 3 enables buzzer 5 to be affected by multiple signal sources, achieving flexible control under complex conditions.

[0048] In summary, this embodiment, based on a human-machine interface display screen for buzzer volume adjustment, is convenient to use and suitable for scenarios with control logic. By introducing a logic chip into the circuit, the flexibility of buzzer volume control and the stability of the circuit are improved. This control circuit design also improves the control accuracy of the buzzer volume and has broad application prospects.

[0049] Example 2

[0050] To more clearly illustrate how introducing a logic chip into a circuit to process signals from multiple signal sources and generate control signals can improve the flexibility of buzzer volume control, this embodiment provides an example.

[0051] See Figure 2 As shown, in this embodiment, the logic chip uses an AND gate for one logic chip and an OR gate for the other to observe the effect of different logic operations on the buzzer control signal.

[0052] (1) Using AND gates

[0053] First signal source (PWM signal): Assume the PWM signal period is 4 time units, with a high level lasting 2 time units and a low level lasting 2 time units. The waveform is as follows:

[0054] Time: 0-1-2-3-4-5-6-7-8

[0055] PWM: HHLLHHLLH...

[0056] Second signal source (control signal): Assume the second signal source is a simple switch signal, where a high level represents "on" and a low level represents "off". For example, it is high during the 3rd to 6th time units and low during the rest of the time. The waveform is as follows:

[0057] Time: 0-1-2-3-4-5-6-7-8

[0058] Signal: LLLHHHHLL...

[0059] The waveform after a logical AND operation: Connecting the PWM signal and the second signal source through an AND gate, the output is high only when both signals are high. The waveform is as follows:

[0060] Time: 0-1-2-3-4-5-6-7-8

[0061] Output: LLLLHHLLL...

[0062] Buzzer effect:

[0063] Because the control signal is high only during the 5th and 6th time units, the buzzer sounds only during these two time units and remains silent for the rest of the time. This produces a brief buzzing sound, the length of which corresponds to the duration of the high level following the logical AND.

[0064] (2) Use OR gate

[0065] First signal source (PWM signal): Assume the PWM signal period is 4 time units, with a high level lasting 2 time units and a low level lasting 2 time units. The waveform is as follows:

[0066] Time: 0-1-2-3-4-5-6-7-8

[0067] PWM: HHLLHHLLH...

[0068] Second signal source (control signal): Assume the second signal source is a simple switch signal, where a high level represents "on" and a low level represents "off". For example, it is high during the 3rd to 6th time units and low during the rest of the time. The waveform is as follows:

[0069] Time: 0-1-2-3-4-5-6-7-8

[0070] Signal: LLLHHHHLL...

[0071] The waveform after a logical OR operation: Connecting the PWM signal and the second signal source through an OR gate, the output will be high as long as either signal is high. The waveform is as follows:

[0072] Time: 0-1-2-3-4-5-6-7-8

[0073] Output: HHLHHHHHLH...

[0074] Buzzer effect:

[0075] Because the control signal is high for portions of time units 0 to 2, 3 to 6, and 8, the buzzer will sound during these time periods. This produces a continuous buzzing sound, but there will be a brief pause between time units 2 to 3 and 6 to 8. This is because during these two time periods, at least one of the PWM signal and the second signal source is low, but due to the characteristics of the OR gate, the output is still high for most of the time, causing the buzzer to sound most of the time.

[0076] These two examples demonstrate how different logical operations affect control signals, which in turn influence the sound output of the buzzer.

[0077] Example 3

[0078] This example demonstrates a more complex logic operation to control a buzzer. In this example, a combination of AND gates, OR gates, and NOT gates is used to implement a specific control logic.

[0079] First signal source (PWM signal): Assume the PWM signal has a period of 8 time units, with a high level lasting for 4 time units and a low level lasting for 4 time units. For simplicity, it is assumed that the PWM signal is high at the beginning of each period.

[0080] Time: 0-1-2-3-4-5-6-7-8-9-10-11-12-13-14-15

[0081] PWM: HHHHLLLLHHHHLLLL...

[0082] Second signal source (control signal 1): Assume that the second signal source is a simple switching signal that is high during the 4th to 12th time units and low during the rest of the time.

[0083] Time: 0-1-2-3-4-5-6-7-8-9-10-11-12-13-14-15

[0084] Signal 1: LLLLHHHHHHHHHLLL...

[0085] Third signal source (control signal 2): ​​Assume that the third signal source is another switching signal, but it is high during the 6th to 10th time units and low during the rest of the time.

[0086] Time: 0-1-2-3-4-5-6-7-8-9-10-11-12-13-14-15

[0087] Signal 2: LLLLLLHHHHHLLLLL...

[0088] Logic operations and control signals:

[0089] (1) AND gate operation: First, connect the second signal source and the third signal source through an AND gate. The AND gate output is high only when both signals are high.

[0090] Time: 0-1-2-3-4-5-6-7-8-9-10-11-12-13-14-15

[0091] AND gate output: LLLLLLHHHHHLLLLL...

[0092] (2) NOT gate operation: Then, the PWM signal is connected through an NOT gate to reverse its logic state.

[0093] Time: 0-1-2-3-4-5-6-7-8-9-10-11-12-13-14-15

[0094] NOT gate output (PWM inversion): LLLLHHHHLLLLHHH...

[0095] (3) OR gate operation: Finally, the AND gate output and the NOT gate output (PWM inversion) are connected through an OR gate. The OR gate output will be high as long as one of the signals is high.

[0096] Time: 0-1-2-3-4-5-6-7-8-9-10-11-12-13-14-15

[0097] The OR gate's final output is: LLLLHHHHHHHLHHHH...

[0098] Buzzer effect:

[0099] Based on the control signal output by the OR gate, the buzzer will emit sound during time units 4 to 10 and 12 to 15 (because the control signal is high), and remain silent during time units 0 to 3 and 11 (because the control signal is low). This control logic allows the buzzer to emit sound under the combined action of multiple signal sources, and the length and pattern of the sound are determined by the logical operation results of these signal sources.

[0100] As demonstrated by the above examples, the technical solution of this application uses PWM signals and multiple control signals as inputs. Through logical operations, by combining different logic gates (such as AND gates, OR gates, and NOT gates), these signals are combined into a new control signal, enabling complex control logic. By converting, filtering, or combining the input signals as needed, specific control requirements can be met. This flexibility allows for precise control of the output signal based on the state of multiple input signals, thereby achieving precise control of buzzers or other devices.

[0101] As demonstrated by the examples above, the technical solution of this application introduces PWM signals and various control signals as input sources. By using logic chips in conjunction with different types of logic gates (such as AND gates, OR gates, NOT gates, etc.) to perform logical operations on these signals, the original input can be transformed into more complex and precise new control signals. This process is not limited to simple signal combinations, but also includes the conversion, filtering, and further combination of signals according to actual needs, ensuring that the final output can meet the control requirements of specific application scenarios. This flexibility and customization capability allows the system to respond to changes in the state of multiple input signals, thereby achieving precise control of the buzzer output.

[0102] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A control circuit for adjusting the volume of a buzzer based on a human-machine interface display screen, characterized in that, The application relates to a control circuit for a buzzer. The control circuit comprises a first signal source for providing a PWM signal; a logic chip comprising a first input end, at least one second input end and at least one output end; wherein the first input end is connected to the output end of the first signal source, and each second input end is connected to an independent second signal source; a field effect transistor whose gate is connected to the output end of the logic chip, whose source is connected to the ground and whose drain is connected to the negative pole of the buzzer; and a buzzer whose positive pole is connected to the positive pole of a power supply circuit. The logic chip receives the signal input of the first signal source and the at least one second signal source, outputs a control signal from the output end after internal logic operation, controls the switching state of the field effect transistor, and drives the buzzer to vibrate. The first signal source comprises a man-machine interface display screen for receiving the volume adjustment instruction set by a user and converting the volume adjustment instruction into an electric signal input into the first input end of the logic chip. The field effect transistor is an N-channel MOSFET. The logic chip comprises an AND gate, an OR gate or a NOT gate logic circuit for realizing the logic operation and processing of the multi-way input signal.

2. The human interface display screen based control circuit for a volume adjustable control of a buzzer according to claim 1, wherein, The control circuit further comprises a freewheeling diode whose positive pole is connected to the drain of the field effect transistor and whose negative pole is connected to the positive pole of the power supply circuit.

3. The human interface display screen based control circuit for a volume adjustable control of a buzzer according to claim 1, wherein, The control circuit further comprises a filter capacitor, one end of which is connected to the positive pole of the power supply circuit and the other end of which is grounded.

4. The human interface display screen based control circuit for a volume adjustable control of a buzzer according to claim 1, wherein, The control circuit further comprises a gate pull-down resistor, one end of which is connected to the gate of the field effect transistor and the other end of which is grounded.

5. The human interface display screen based control circuit for a volume adjustable control of a buzzer according to claim 1, wherein, The control circuit further comprises a pull-down resistor, one end of which is connected to the output end of the first signal source and the other end of which is grounded.

6. The human interface display screen based control circuit for a volume adjustable control of a buzzer according to claim 1, wherein, ​ 7. The human interface display screen based control circuit for a volume adjustable control of a buzzer according to claim 1, wherein, ​ 8. The human interface display screen based control circuit for a volume adjustable control of a buzzer according to claim 1, wherein, ​

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