Buzzer driving circuit and electronic equipment

Abstract

The utility model discloses a buzzer driving circuit and an electronic device. The buzzer driving circuit comprises a touch detection module and a driving control module. The first end of the touch detection module is connected with the touch key, the second end of the touch detection module is connected with the first end of the driving control module, the second end of the driving control module is connected with the power supply, and the third end of the driving control module is connected with the buzzer. The touch detection module generates a power supply control signal and a switch driving signal when receiving a trigger signal of the touch key, and transmits the power supply control signal and the switch driving signal to the driving control module; and when receiving the switch driving signal, the driving control module drives the power supply to supply power to the buzzer according to the pulse width of the power supply control signal.

Description

Technical Field

[0001] This utility model relates to the field of audio equipment technology, and in particular to buzzer driver circuits and electronic devices. Background Technology

[0002] With the popularization of portable speakers and other smart products, users have higher requirements for the functionality of touch interaction. In traditional speaker products, the buzzer can only achieve simple control of "sounding" or "stopping". The prompt tone is usually a fixed volume and duration, lacking dynamic changes, and the interaction feedback effect between the buzzer and the touch switch is poor. Utility Model Content

[0003] The main purpose of this utility model is to provide a buzzer driving circuit and electronic device, which aims to solve the technical problem of poor interactive feedback between the buzzer and the touch switch in existing speaker products.

[0004] To achieve the above objectives, this utility model proposes a buzzer driver circuit, comprising:

[0005] Touch detection module and drive control module;

[0006] The first end of the touch detection module is connected to the touch button, the second end of the touch detection module is connected to the first end of the drive control module, the second end of the drive control module is connected to the power supply, and the third end of the drive control module is connected to the buzzer.

[0007] The touch detection module is used to generate a power control signal and a switch drive signal when a trigger signal is received from a touch button, and then transmit the power control signal and the switch drive signal to the drive control module.

[0008] The drive control module is used to drive the power supply to supply power to the buzzer according to the pulse width of the power control signal when a switch drive signal is received.

[0009] In addition, to achieve the above objectives, this utility model also proposes an electronic device, which includes: the buzzer driving circuit as described above. Attached Figure Description

[0010] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the structure of the first embodiment of the buzzer driver circuit of this utility model;

[0013] Figure 2 A schematic diagram of the module provided for the second embodiment of the buzzer driver circuit of this utility model;

[0014] Figure 3 The circuit connection diagram provided for the second embodiment of the buzzer driver circuit of this utility model;

[0015] Figure 4 The circuit connection diagram provided for the third embodiment of the buzzer driver circuit of this utility model;

[0016] Figure 5 This is a circuit connection diagram provided for an embodiment of the electronic device of this utility model.

[0017] Explanation of reference numerals in the attached diagram: R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; R6, sixth resistor; C1, first capacitor; C2, second capacitor; C3, third capacitor; C4, fourth capacitor; C5, fifth capacitor; D1, first diode; D2, second diode; Q1, first switching transistor; Q2, second switching transistor; Q3, third switching transistor; 10, touch detection module; 20, drive control module; 30, buzzer; 201, power supply control unit; 202, buzzer drive unit; 2011, switch subunit; 2012, drive subunit; VS, power supply; SW, touch button; PW, power control signal; BUZ, switch drive signal.

[0018] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0022] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0023] Based on this, this utility model embodiment provides a buzzer driving circuit, referring to... Figure 1 , Figure 1 This is a schematic diagram of the first embodiment of the buzzer driver circuit of this utility model.

[0024] In this embodiment, the buzzer driving circuit includes a touch detection module 10 and a driving control module 20.

[0025] The first end of the touch detection module 10 is connected to the touch button SW, the second end of the touch detection module 10 is connected to the first end of the drive control module 20, the second end of the drive control module 20 is connected to the power supply, and the third end of the drive control module 20 is connected to the buzzer 30.

[0026] It should be noted that the touch detection module 10 can generate a power control signal and a switch drive signal when it receives a trigger signal from the touch button SW, and transmit the power control signal and the switch drive signal to the drive control module 20. The drive control module 20 can drive the power supply to supply power to the buzzer 30 according to the pulse width of the power control signal when it receives the switch drive signal.

[0027] It should be understood that a touch switch can be an electronic touch function that can control a circuit through touch operation. Different controls can be achieved through gestures such as single click, double click, and long press. It typically uses capacitive sensing technology to detect touch operations. A buzzer can be an electronic device used to generate a continuous beeping sound or other simple sound signals. It usually consists of an oscillator, a driver circuit, and a speaker. Portable speakers and smart soundbars, among other audio devices, incorporate both touch switches and buzzers.

[0028] Furthermore, the touch detection module can be an electronic device that senses the operation signals of the touch buttons and generates corresponding control signals based on the touch actions. For example, it can be constructed using an AS9072DT-M touch IC chip and peripheral circuitry. It can receive user trigger signals (e.g., changes in touch capacitance) from the touch buttons to determine if the user has touched the touch switch, and sense the number of touches and the duration of those touches. Upon receiving the trigger signal when the user touches the touch switch, it outputs a power control signal (PW) and a switch drive signal (BUZ). The drive control module can be an electronic device that dynamically adjusts the power supply to the buzzer to generate a gradual beep tone.

[0029] The power control signal (PW) can be a high-level signal with a corresponding pulse width generated based on the touch action (e.g., a 20ms high-level output for a single touch). The pulse width affects the initial volume and duration of the buzzer's gradual tone, and can therefore be set according to actual needs. The switch drive signal (BUZ) can be a high-frequency pulse signal (e.g., a 4kHz pulse signal) to control the buzzer's sound. The signal frequency can be adjusted according to the buzzer's characteristics to ensure it operates within the optimal sound frequency range.

[0030] This embodiment provides a buzzer driving circuit, which includes a touch detection module and a drive control module. The first end of the touch detection module is connected to a touch button, the second end of the touch detection module is connected to the first end of the drive control module, the second end of the drive control module is connected to a power supply, and the third end of the drive control module is connected to the buzzer. When the touch detection module receives a trigger signal from the touch button, it generates a power control signal and a switch drive signal, and transmits these signals to the drive control module. When the drive control module receives the switch drive signal, it drives the power supply to power the buzzer according to the pulse width of the power control signal. By detecting the trigger status of the touch button through the touch detection module and driving the power supply to power the buzzer based on the pulse width of the power control signal when the button is triggered, a combined touch and prompt sound auditory experience is achieved, improving the interactive feedback effect between the buzzer and the touch switch.

[0031] Based on the first embodiment of this utility model, in the second embodiment of this utility model, the contents that are the same as or similar to those in the first embodiment described above can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 2 , Figure 2 This is a schematic diagram of the module provided for the second embodiment of the buzzer driver circuit of this utility model.

[0032] In this embodiment, the drive control module 20 includes: a first capacitor C1, a power supply control unit 201, and a buzzer 30 drive unit. The first terminal of the power supply control unit 201 is connected to the power supply VS, the second terminal of the power supply control unit 201 is connected to the first capacitor C1, and the third terminal of the power supply control unit 201 is connected to the touch detection module 10. The first terminal of the buzzer 30 drive unit is connected to the first capacitor C1, the second terminal of the buzzer 30 drive unit is connected to the buzzer 30, and the third terminal of the buzzer 30 drive unit is connected to the touch detection module 10.

[0033] It should be noted that the touch detection module 10 can also be used to transmit the power control signal to the power supply control unit 201 and the switch drive signal to the buzzer 30 drive unit; the power supply control unit 201 can be used to drive the power supply VS to charge the first capacitor C1 according to the pulse width of the power control signal; the drive control module 20 can be used to turn on the power supply circuit between the first capacitor C1 and the buzzer 30 when the switch drive signal is received.

[0034] It should be understood that the first capacitor C1 can be an energy storage electrolytic capacitor used to store and release electrical energy to achieve gradual power supply for the buzzer. The energy stored during charging determines the initial volume (the higher the voltage, the louder the volume), and the voltage decreases exponentially during discharging, causing the buzzer current to gradually decrease, thus achieving a gradual change in volume.

[0035] In one possible implementation, the buzzer driving unit includes: a first switching transistor, a first resistor, a second resistor, and a second capacitor. (See reference...) Figure 3 , Figure 3 The circuit connection diagram provided for the second embodiment of the buzzer driver circuit of this utility model is shown.

[0036] In this configuration, the first terminal of the first switch transistor Q1 is connected to the negative terminal of the buzzer 30, the positive terminal of the buzzer 30 is connected to the first capacitor C1, the second terminal of the first switch transistor Q1 is connected to the first resistor R1, the second resistor R2 and the first terminal of the second capacitor C2, the second terminal of the first resistor R1 is connected to the touch detection module 10, and the second terminal of the second resistor R2 is connected to the second terminal of the second capacitor C2 and the third terminal of the first switch transistor Q1 and grounded.

[0037] It should be understood that when the touch button is touched, the touch detection module outputs a 4kHz frequency pulse switching drive signal to control the first switch Q1 to turn on. When current flows through the buzzer, the buzzer sounds. When the touch button is unresponsive, the touch detection module outputs a low-level signal, the first switch Q1 is turned off, and the buzzer is in a non-operating state.

[0038] Furthermore, the buzzer 30 driving unit further includes: a freewheeling sub-unit; the freewheeling sub-unit is disposed between the positive and negative terminals of the buzzer 30; the freewheeling sub-unit is used to deplete the remaining charge of the first capacitor C1 when the power supply circuit between the first capacitor C1 and the buzzer 30 is turned off.

[0039] The freewheeling sub-unit includes a third capacitor C3 and a first diode D1; the first terminal of the third capacitor C3 is connected to the first capacitor C1, the cathode of the first diode D1 and the positive terminal of the buzzer 30, the second terminal of the third capacitor C3 is grounded, and the anode of the first diode D1 is connected to the negative terminal of the buzzer 30 and the first terminal of the first switching transistor Q1.

[0040] It should be understood that the first diode D1 can be a freewheeling diode. When the drive circuit is turned off, the remaining current needs to be consumed through the circuit of the freewheeling diode and the buzzer to avoid damage to electronic components.

[0041] In this embodiment, the drive control module includes: a first capacitor, a power supply control unit, and a buzzer drive unit. The power supply control unit drives the power supply to charge the first capacitor according to the pulse width of the power control signal. When the drive control module receives the switch drive signal, it connects the power supply circuit between the first capacitor and the buzzer. The principle of capacitor discharge is used to achieve a gradual change in buzzer sound from high to low, enhancing the versatility of product functions.

[0042] Based on the first and / or second embodiments of this utility model, in the third embodiment of this utility model, the contents that are the same as or similar to those in the above embodiments can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 4 , Figure 4 The circuit connection diagram provided for the third embodiment of the buzzer driver circuit of this utility model.

[0043] In this embodiment, the power supply control unit 201 includes a switch subunit 2011 and a drive subunit 2012. The first terminal of the switch subunit 2011 is connected to the power supply VS, the second terminal of the switch subunit 2011 is connected to the first capacitor C1, the third terminal of the switch subunit 2011 is connected to the first terminal of the drive subunit 2012, and the second terminal of the drive subunit 2012 is connected to the touch detection module 10.

[0044] It should be noted that the touch detection module can also be used to transmit the power control signal to the driving subunit; the driving subunit can be used to generate a power supply driving signal when it receives the power control signal, and transmit the power supply driving signal to the switching subunit; the switching subunit can be used to turn on the power supply circuit between the power supply and the first capacitor when it receives the power supply driving signal.

[0045] In one possible implementation, the driving subunit 2012 includes: a second switch Q2, a third resistor R3, a fourth resistor R4, and a fourth capacitor C4; the first terminal of the second switch Q2 is connected to the switching subunit 2011, the second terminal of the second switch Q2 is connected to the first terminal of the third resistor R3, the fourth resistor R4, and the fourth capacitor C4, the second terminal of the third resistor R3 is connected to the touch detection module 10, and the second terminal of the fourth resistor R4 is connected to the third terminal of the fourth capacitor C4 and the second switch Q2 and grounded.

[0046] The switching subunit 2011 includes: a third switching transistor Q3, a fifth resistor R5, a sixth resistor R6, and a fifth capacitor C5; the first terminal of the third switching transistor Q3 is connected to the first terminal of the fifth resistor R5, the first terminal of the fifth capacitor C5, and the power supply VS; the second terminal of the fifth resistor R5 is connected to the second terminal of the fifth capacitor C5, the second terminal of the third switching transistor Q3, and the first terminal of the sixth resistor R6; the second terminal of the sixth resistor R6 is connected to the first terminal of the second switching transistor Q2; and the third terminal of the third switching transistor Q3 is connected to the first capacitor C1.

[0047] Furthermore, the switching subunit 2011 may also be provided with a protection diode to prevent charging back current, including: a second diode D2; the anode of the second diode D2 is connected to the power supply VS, and the cathode of the second diode D2 is connected to the first terminal of the third switching transistor Q3.

[0048] It should be understood that when the touch button is triggered, the power control signal PW first outputs a high level to drive the second switch Q2 to turn on, and then drives the third switch Q3 (which can be a field-effect transistor) to turn on to charge the first capacitor C1. At the same time, the switch drive signal outputs a high-frequency pulse to drive the buzzer. After the power control signal PW pulse ends, the third switch Q3 turns off, and the first capacitor C1 discharges to maintain the buzzer's gradual sound until the power is exhausted.

[0049] In this embodiment, during a single touch, the power control signal PW outputs a high level for 20ms followed by a low level. The capacitance of the first capacitor can be selected based on the actual application's gradient time. During multiple touches, the first capacitor C1 discharges to maintain the buzzer's gradual sound. When the touch button is pressed again, the third switch Q3 is turned on to charge the first capacitor C1, and the buzzer sound returns to its maximum volume, gradually decreasing from high to low until there is no touch action. After the electrolytic capacitor discharges to 0V, the sound disappears.

[0050] Further, please refer to Figure 5 , Figure 5 This is a circuit connection diagram provided for one embodiment of the electronic device of this utility model. This utility model embodiment also proposes an electronic device. The electronic device includes the buzzer driver circuit described above.

[0051] Since the electronic device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0052] It should be noted that the above examples are only for understanding this utility model and do not constitute a limitation on the buzzer drive circuit of this utility model. Any simple modifications based on this technical concept are within the protection scope of this utility model.

[0053] The above description is only a preferred embodiment of the present utility model and does not limit the scope of protection of the present utility model. All equivalent structural transformations made under the concept of the present utility model and based on the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. A buzzer driver circuit, characterized in that, The buzzer driving circuit includes: a touch detection module and a driving control module; The first end of the touch detection module is connected to the touch button, the second end of the touch detection module is connected to the first end of the drive control module, the second end of the drive control module is connected to the power supply, and the third end of the drive control module is connected to the buzzer. The touch detection module is used to generate a power control signal and a switch drive signal when it receives a trigger signal from a touch button, and transmit the power control signal and the switch drive signal to the drive control module. The drive control module is used to drive the power supply to supply power to the buzzer according to the pulse width of the power control signal when it receives the switch drive signal.

2. The buzzer drive circuit as described in claim 1, characterized in that, The drive control module includes: a first capacitor, a power supply control unit, and a buzzer drive unit; The first terminal of the power supply control unit is connected to the power supply, the second terminal of the power supply control unit is connected to the first capacitor, the third terminal of the power supply control unit is connected to the touch detection module, the first terminal of the buzzer drive unit is connected to the first capacitor, the second terminal of the buzzer drive unit is connected to the buzzer, and the third terminal of the buzzer drive unit is connected to the touch detection module. The touch detection module is also used to transmit the power control signal to the power supply control unit and the switch drive signal to the buzzer drive unit; The power supply control unit is used to drive the power supply to charge the first capacitor according to the pulse width of the power control signal; The drive control module is used to turn on the power supply circuit between the first capacitor and the buzzer when it receives the switch drive signal.

3. The buzzer drive circuit as described in claim 2, characterized in that, The buzzer driving unit includes: a first switching transistor, a first resistor, a second resistor, and a second capacitor; The first terminal of the first switching transistor is connected to the negative terminal of the buzzer, the positive terminal of the buzzer is connected to the first capacitor, the second terminal of the first switching transistor is connected to the first resistor, the second resistor and the first terminal of the second capacitor, the second terminal of the first resistor is connected to the touch detection module, and the second terminal of the second resistor is connected to the second terminal of the second capacitor and the third terminal of the first switching transistor and grounded.

4. The buzzer driver circuit as described in claim 3, characterized in that, The buzzer driving unit further includes: a freewheeling subunit; The freewheeling sub-unit is disposed between the positive and negative terminals of the buzzer; The freewheeling subunit is used to deplete the remaining charge of the first capacitor when the power supply circuit between the first capacitor and the buzzer is turned off.

5. The buzzer driver circuit as described in claim 4, characterized in that, The freewheeling subunit includes: a third capacitor and a first diode; The first terminal of the third capacitor is connected to the first capacitor, the cathode of the first diode, and the positive terminal of the buzzer. The second terminal of the third capacitor is grounded. The anode of the first diode is connected to the negative terminal of the buzzer and the first terminal of the first switching transistor.

6. The buzzer drive circuit as described in claim 2, characterized in that, The power supply control unit includes: a switching subunit and a driving subunit; The first terminal of the switch subunit is connected to the power supply, the second terminal of the switch subunit is connected to the first capacitor, the third terminal of the switch subunit is connected to the first terminal of the drive subunit, and the second terminal of the drive subunit is connected to the touch detection module. The touch detection module is also used to transmit the power control signal to the drive subunit; The drive subunit is configured to generate a power supply drive signal upon receiving the power control signal, and transmit the power supply drive signal to the switch subunit. The switching subunit is used to turn on the power supply circuit between the power supply and the first capacitor when the power supply drive signal is received.

7. The buzzer driver circuit as described in claim 6, characterized in that, The driving subunit includes: a second switching transistor, a third resistor, a fourth resistor, and a fourth capacitor; The first end of the second switching transistor is connected to the switching subunit, the second end of the second switching transistor is connected to the first end of the third resistor, the fourth resistor and the fourth capacitor, the second end of the third resistor is connected to the touch detection module, and the second end of the fourth resistor is connected to the third capacitor and the third end of the second switching transistor and grounded.

8. The buzzer drive circuit as described in claim 7, characterized in that, The switching subunit includes: a third switching transistor, a fifth resistor, a sixth resistor, and a fifth capacitor; The first terminal of the third switch is connected to the first terminal of the fifth resistor, the first terminal of the fifth capacitor, and the power supply. The second terminal of the fifth resistor is connected to the second terminal of the fifth capacitor, the second terminal of the third switch, and the first terminal of the sixth resistor. The second terminal of the sixth resistor is connected to the first terminal of the second switch. The third terminal of the third switch is connected to the first capacitor.

9. The buzzer driver circuit as described in claim 8, characterized in that, The switching subunit further includes: a second diode; The anode of the second diode is connected to the power supply, and the cathode of the second diode is connected to the first terminal of the third switching transistor.

10. An electronic device, characterized in that, The electronic device includes: a buzzer driver circuit as described in any one of claims 1-9.

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