CN210670527U - Drive circuit and mobile terminal of buzzing sound - Google Patents
Drive circuit and mobile terminal of buzzing sound Download PDFInfo
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- CN210670527U CN210670527U CN201921514657.4U CN201921514657U CN210670527U CN 210670527 U CN210670527 U CN 210670527U CN 201921514657 U CN201921514657 U CN 201921514657U CN 210670527 U CN210670527 U CN 210670527U
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Abstract
A drive circuit of a buzz and a mobile terminal having a buzz output function, the drive circuit comprising: the audio signal processing device comprises a first signal output module, a second signal output module, a signal conversion module, a power amplifier module and a first audio driving module; the first signal output module outputs a first pulse width modulation signal; the second signal output module outputs a second pulse width modulation signal; sequentially carrying out signal conversion and power amplification on the first pulse width modulation signal and the second pulse width modulation signal to obtain a first audio playing signal and a second audio playing signal; the loudspeaker can be driven to emit corresponding buzzing sound by combining the first audio playing signal and the second audio playing signal so as to meet the auditory requirement of a user; this embodiment can carry out differential drive's mode to loudspeaker, and then audio information such as loudspeaker playable music has also realized the output function of buzzing sound, has simplified drive circuit's internal circuit structure, and circuit design's the degree of difficulty reduces, has reduced the drive cost of buzzing sound.
Description
Technical Field
The application belongs to the technical field of electronic circuits, and particularly relates to a drive circuit of buzzing sound and a mobile terminal with a buzzing sound output function.
Background
With the continuous improvement of the living standard of people, audio equipment becomes indispensable electronic equipment for daily life of people, the audio equipment is low in manufacturing cost and simple in manufacturing steps, the audio equipment is widely applied to different industrial technical fields, good hearing experience is brought to users through sound emitted by the audio equipment, and after the audio equipment is subjected to self-adaptive control, the audio equipment can emit corresponding audio according to the actual requirements of the users; and according to different hearing demands of users, audio equipment gradually evolves from a single type to multiple types, different generation effects can be achieved, and circuit functions of the audio equipment are gradually complicated.
Among them, the BEEP sound (buzzing sound) is one of important elements in the sound production function of the audio device, and since the BEEP sound plays a very critical role in various industries, the sound production function of the BEEP sound has become an unavailable factor in the design process of the audio device, which has a very important practical significance for the audio device; the structure of the circuit for generating the BEEP sound in the conventional art is complicated, which causes the manufacturing cost of the circuit structure to rise; for example, in the conventional technology, a buzzer is usually used for emitting the BEEP sound, and since the buzzer can only emit the BEEP sound, a technician must also use other audio circuits to realize a function of emitting sounds similar to ordinary audio, such as music, etc.; therefore, the traditional technology adopts an additional buzzer to lead to circuit design redundancy, increase the space volume of the audio equipment and bring great inconvenience to the use of users.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present application provides a buzzer driving circuit and a mobile terminal having a buzzer output function, and aims to solve the problems that the circuit structure complexity is increased and the circuit design difficulty of an audio device is high due to the fact that a buzzer is adopted to emit a BEEP sound in a conventional technical scheme and the cost of BEEP sound generation is high.
A first aspect of an embodiment of the present application provides a buzzer driving circuit, including:
a first signal output module configured to output a first pulse width modulation signal;
a second signal output module configured to output a second pulse width modulation signal;
the signal conversion module is connected with the first signal output module and the second signal output module, and is configured to convert the first pulse width modulation signal into a first audio driving signal and convert the second pulse width modulation signal into a second audio driving signal;
the power amplification module is connected with the signal conversion module and is configured to amplify the power of the first audio driving signal to obtain a first audio playing signal and amplify the power of the second audio driving signal to obtain a second audio playing signal; and
and the first audio driving module is connected with the power amplifier module and the loudspeaker and is configured to drive the loudspeaker to play the buzzing sound according to the first audio playing signal and the second audio playing signal.
In one embodiment, the signal conversion module comprises:
the first voltage regulating unit is connected with the first signal output module and the power amplifier module and is configured to regulate the voltage of the first pulse width modulation signal to obtain the first audio driving signal; and
and the second voltage regulating unit is connected with the second signal output module and the power amplifier module and is configured to regulate the voltage of the second pulse width modulation signal to obtain the second audio driving signal.
In one embodiment, the method further comprises:
and the second audio driving module is connected with the audio storage device and the loudspeaker, is configured to receive a third audio playing signal output by the audio storage device, and drives the loudspeaker to play audio according to the third audio playing signal.
In one embodiment, the first audio driver module comprises:
the first filtering unit is connected with the power amplification module and is configured to filter the first audio playing signal;
the second filtering unit is connected with the power amplification module and is configured to filter the second audio playing signal; and
the first audio driving unit is connected with the power amplifier module, the first filtering unit, the second filtering unit and the loudspeaker and is configured to drive the loudspeaker to play buzzing sound according to the first audio playing signal after filtering processing and the second audio playing signal after filtering processing.
In one embodiment, the first filtering unit includes:
a first capacitor and a second capacitor;
the first end of the first capacitor and the first end of the second capacitor are connected with the power amplifier module and the first audio driving unit;
the second end of the first capacitor and the second end of the second capacitor are connected to the ground in common.
In one embodiment, the second filtering unit includes:
a third capacitor and a fourth capacitor;
the first end of the third capacitor and the first end of the fourth capacitor are connected with the power amplifier module and the first audio driving unit;
and the second end of the third capacitor and the second end of the fourth capacitor are connected to the ground in common.
In one embodiment thereof, the first audio driving unit includes:
a first variable resistor, a second variable resistor, a first resistance, a second resistance, a third resistance, a fourth resistance, and a fifth capacitance;
the first end of the first resistor is connected with the power amplifier module, the first end of the second resistor is connected with the power amplifier module, the first end of the first variable resistor, the second end of the first resistor, the first end of the fifth capacitor and the first end of the third resistor are connected to the first filtering unit in common, and the second end of the first variable resistor is grounded;
the first end of the second variable resistor, the second end of the second resistor, the second end of the fifth capacitor and the first end of the fourth resistor are connected to the second filtering unit in common, the second end of the second variable resistor is grounded, the second end of the third resistor is connected to the positive signal input end of the horn, and the second end of the fourth resistor is connected to the negative signal input end of the horn.
In one embodiment, the first voltage regulating unit includes:
a sixth capacitor, a fifth resistor and a sixth resistor;
the first end of the sixth capacitor is connected with the first signal output module, the second end of the sixth capacitor is connected with the first end of the fifth resistor, the second end of the fifth resistor and the first end of the sixth resistor are connected with the power amplification module in a shared mode, and the second end of the sixth resistor is grounded;
the second voltage adjusting unit includes:
a seventh capacitor, an eighth capacitor, a ninth capacitor, a seventh resistor, an eighth resistor, and a ninth resistor;
the first end of the seventh capacitor is connected with the second signal output module, the second end of the seventh capacitor is connected with the first end of the seventh resistor, the second end of the seventh resistor is connected with the first end of the eighth capacitor, the first end of the ninth capacitor is grounded, the second end of the ninth capacitor is connected with the first end of the eighth resistor, the second end of the eighth capacitor and the first end of the ninth resistor are connected with the power amplifier module in common, and the second end of the ninth resistor is grounded.
In one embodiment, the method further comprises:
and the power module is connected with the signal conversion module, the power amplifier module and the first audio driving module, and is configured to output a power signal so as to supply power to the signal conversion module, the power amplifier module and the first audio driving module.
A second aspect of an embodiment of the present application provides a mobile terminal having a buzzer sound output function, including:
a horn; and
the drive circuit is connected with the loudspeaker and used for driving the loudspeaker to play buzzing sound.
The drive circuit of the buzzing sound realizes a drive mode of a differential signal through the first pulse width modulation signal and the second pulse width modulation signal, and can directly drive the loudspeaker to play the BEEP sound after signal conversion and power amplification are carried out on the first pulse width modulation signal and the second pulse width modulation signal so as to meet the requirement of the BEEP sound of the electronic equipment; therefore, the driving circuit in the embodiment of the application does not need to adopt the buzzer to meet the requirement of BEEP sound production, only needs to send out BEEP sound in a mode of carrying out pulse width modulation on the loudspeaker, greatly simplifies the structural design of the driving circuit, improves the driving output efficiency of the BEEP sound, has lower cost of BEEP sound output, and further the driving circuit can be compatibly suitable for different industrial technology fields, saves the design and application cost of the driving circuit of the buzzer sound, brings great convenience for the use of a user, and has higher practical value.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a buzzer driving circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a signal conversion module according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a buzzer driving circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a first audio driver module according to an embodiment of the present application;
fig. 5 is a schematic circuit structure diagram of a first filtering unit according to an embodiment of the present disclosure;
fig. 6 is a schematic circuit structure diagram of a second filtering unit according to an embodiment of the present disclosure;
fig. 7 is a schematic circuit structure diagram of a first audio driving unit according to an embodiment of the present disclosure;
fig. 8 is a schematic circuit diagram of a first voltage regulating unit and a second voltage regulating unit according to an embodiment of the present disclosure;
fig. 9 is a schematic structural diagram of a buzzer driving circuit according to an embodiment of the present application;
fig. 10 is a schematic structural diagram of a mobile terminal with a buzzer sound output function according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It should be noted that the BEEP sound refers to a BEEP sound emitted by the electronic device, wherein the BEEP sound is used as a sound information having a basic and obvious characteristic, and the BEEP sound emitted by the audio device has an important information prompt function so as to meet the use requirement of the electronic device; for example, when an alarm is given, the computer mainboard emits a short sound as a BEEP sound, and for example, a repeated sound emitted by an automobile when the alarm is given also belongs to the BEEP sound; by analogy, the BEEP sound is widely existed in electronic products of all walks of life, and the output function of the BEEP sound has extremely important significance for promoting the practical value of the electronic products, thereby meeting the actual auditory demand of users.
Referring to fig. 1, a schematic structural diagram of a driving circuit 10 for a buzzer provided in the embodiment of the present application is shown, where the driving circuit 10 is connected to a speaker 20, and the speaker 20 can be subjected to audio differential driving through the driving circuit 10, so that audio driving steps of BEEP sounds are greatly simplified, and audio driving cost is reduced; because the loudspeaker 20 is used as audio equipment, common audio information such as music and the like can be sent out, and BEEP sound can also be sent out under the driving of the driving circuit 10, the compatibility of the driving circuit 10 for buzzing sound is greatly improved; for convenience of explanation, only the parts related to the present embodiment are shown, and detailed as follows:
the drive circuit 10 includes: the audio signal processing device comprises a first signal output module 101, a second signal output module 102, a signal conversion module 103, a power amplifier module 104 and a first audio driving module 105.
The first signal output module 101 outputs a first Pulse Width Modulation (PWM) signal.
First signal output module 101 has signal generation and output function, can generate through first signal output module 101 and have the duty cycle of predetermineeing and predetermine the first pulse width modulation signal of voltage, and then can drive electronic components through first pulse width modulation signal and realize corresponding circuit function, has ensured drive circuit 10's signal output efficiency and audio drive efficiency, and first pulse width modulation signal has signal drive function, and then realizes the quick drive output function of BEEP sound.
The second signal output module 102 is configured to output a second pulse width modulated signal.
The second pulse width modulation signal has a preset duty ratio and a preset voltage, the signal generation and signal output functions can be realized through the second signal output module 102, the second pulse width modulation signal contains circuit control information, and then the internal signal conversion state of the driving circuit 10 can be changed in real time through the second pulse width modulation signal, so that the self-adaption and flexible adjustment functions of the audio driving process are realized.
Therefore, in this embodiment, the first signal output module 101 and the second signal output module 102 are combined to implement signal generation and signal driving processes, and the first pwm signal and the second pwm signal have a transmission mode of differential signals, so that a fast driving control function of the BEEP sound is implemented, and the signal control response accuracy and efficiency of the driving circuit 10 are improved.
The signal conversion module 103 is connected to the first signal output module 101 and the second signal output module 102, and configured to convert the first pwm signal into a first audio driving signal and convert the second pwm signal into a second audio driving signal.
When the first signal output module 101 outputs the first pulse width modulation signal to the signal conversion module 103 and the second signal output module 102 outputs the second pulse width modulation signal to the signal conversion module 103, the signal conversion module 103 can be compatible with control information for identifying both the first pulse width modulation signal and the second pulse width modulation signal; the signal conversion module 103 has a signal form conversion function, and after the signal form conversion is performed on the first pulse width modulation signal and the second pulse width modulation signal by the signal conversion module 103, the first audio driving signal and the second audio driving signal are respectively obtained, so that the audio driving function can be directly realized by combining the first audio driving signal and the second audio driving signal, the BEEP sound production efficiency of the driving circuit 10 is improved, and good auditory experience is brought to a user; therefore, the signal conversion module 103 in this embodiment has higher signal conversion accuracy and signal conversion efficiency, so that the driving circuit 10 has higher audio driving efficiency, which is beneficial to improving the internal signal driving quality and output quality of the driving circuit 10.
The power amplifier module 104 is connected to the signal conversion module 103, and is configured to perform power amplification on the first audio driving signal to obtain a first audio playing signal, and perform power amplification on the second audio driving signal to obtain a second audio playing signal.
The power amplifier module 104 has a signal power amplifying function, the signal conversion module 103 outputs the first audio driving signal and the second audio driving signal to the power amplifier module 104, and the first audio playing signal and the second audio playing signal after power amplification comprise more complete audio driving information, so that a faster and more accurate BEEP sound driving control function is realized, and the efficiency and the accuracy of signal transmission are improved; therefore, the transmission efficiency and the conversion precision of the audio driving information can be guaranteed through the power amplifier module 104, and the audio driving information is prevented from being distorted and lost inside the driving circuit 10; therefore, the driving circuit 10 in this embodiment can be applied to various different communication environments to achieve the functions of fast transmission and accurate conversion of the audio driving information, and has high compatibility and practical value.
The first audio driving module 105 is connected to the power amplifier module 104 and the speaker 20, and configured to drive the speaker 20 to play the BEEP sound according to the first audio playing signal and the second audio playing signal.
The loudspeaker 20 has a sound production function, and the loudspeaker 20 can be driven in time through the first audio driving module 105 to realize an audio playing function, so that the audio playing quality of the loudspeaker 20 is guaranteed, the audio driving efficiency of the loudspeaker 20 is guaranteed, the auditory requirement of a user is met, the driving circuit 10 has high audio driving efficiency and accuracy for the loudspeaker 20, and the practical value is high; when the power amplifier module 104 outputs the first audio playing signal and the second audio playing signal to the first audio driving module 105, the first audio driving module 105 will realize the audio driving function, which greatly simplifies the audio driving steps and the control process of the loudspeaker 20, the loudspeaker 20 can send out clear BEEP sound according to the actual requirement of the user, the driving circuit 10 has higher compatibility and audio driving quality, and the practical value is higher.
In the structural schematic of the driving circuit 10 shown in fig. 1, the driving circuit 10 has a simplified circuit module structure, which reduces the circuit design cost and the manufacturing cost of the driving circuit 10; the transmission form of the differential signal can be realized by combining the first pulse width modulation signal and the second pulse width modulation signal, and after the audio control information is accurately converted and power-amplified, the problems of information loss and errors in the transmission process of the audio control information are avoided, so that the first audio driving module 105 can perform a rapid audio driving function on the loudspeaker 20, the loudspeaker 20 can emit clear BEEP sound in real time, and good hearing experience is brought to a user; therefore, the driving circuit 10 in this embodiment can implement a differential modulation mode for the speaker 20, thereby achieving a fast driving control effect for the BEEP sound, greatly simplifying the output driving step of the BEEP sound, and the driving circuit 10 has a more simplified circuit structure, thereby reducing the driving cost of the BEEP sound and bringing greater convenience to the user; therefore, the BEEP sound output function can be realized only by driving the loudspeaker 20 without adopting a special buzzer in the embodiment, the circuit structure design of the driving circuit 10 is simplified, the space volume of the driving circuit 10 is reduced, and the problems that the driving cost of the BEEP sound is high, the driving control step is too complex, the circuit design is redundant, the occupied space volume is large, and great inconvenience is brought to the use of a user in the conventional technology are effectively solved.
As an alternative embodiment, the second signal output module 102 is integrated into a Secure Processor (SP).
As an alternative embodiment, the first signal output module 101 and the power amplifier module 104 are integrated into an Application Processor (AP).
And then can realize audio control information's output function and signal power amplification function through using the treater, greatly improved the integrated nature and the stability of drive circuit 10's internal circuit structure module, and then realize audio drive function through carrying out the integrated conversion to control information, drive circuit 10 has the more simplified circuit structure design step, has simplified drive circuit 10's circuit space layout structure, has brought higher use experience for the user, and practical value is higher.
As an optional implementation manner, fig. 2 shows a schematic structure of the signal conversion module 103 provided in this embodiment, please refer to fig. 2, where the signal conversion module 103 includes: a first voltage adjusting unit 1031 and a second voltage adjusting unit 1032; the first voltage adjustment unit 1031 is connected to the first signal output module 101 and the power amplifier module 104, and is configured to adjust the voltage of the first pwm signal to obtain the first audio driving signal.
Specifically, after the voltage of the first pulse width modulation signal is adjusted by the first voltage adjustment unit 1031, the voltage of the first audio driving signal is within a first preset range, and the safety driving function of the electronic component can be realized by the first audio driving signal, so that the safety and stability of the internal electric energy of the driving circuit 10 are ensured.
Wherein, when the first signal output module 101 outputs the first pwm signal to the first voltage adjustment unit 1031, the first voltage adjustment unit 1031 has a voltage adjustment function, and then after performing voltage adjustment on the first pwm signal, the first audio driving signal can be accurately obtained, so as to realize the function of signal conversion, the audio driving function can be accurately realized through the first audio driving signal, the driving control efficiency of the BEEP sound is ensured, the accuracy and efficiency of the audio driving for the speaker 20 can be improved according to the first audio driving signal, and the practical value is high.
The second voltage adjusting unit 1032 is connected to the second signal output module 102 and the power amplifier module 104, and is configured to adjust the voltage of the second pwm signal to obtain a second audio driving signal.
Specifically, the second voltage adjusting unit 1032 adjusts the voltage of the second pulse width modulation signal, so that the voltage of the second audio driving signal is within the second preset range, and then the second audio driving signal can realize a safe audio driving function for the speaker 20, thereby ensuring the safety and transmission efficiency of the internal electric energy of the driving circuit 10.
The second voltage adjusting unit 1032 has a voltage adjusting function, and after the second signal output module 102 outputs the second pwm signal to the second voltage adjusting unit 1032, the second voltage adjusting unit 1032 can change the voltage of the second pwm signal in real time, so that the voltage of the second audio driving signal is within a preset range, and then the second audio driving signal obtained after voltage adjustment has a higher accurate audio driving function, the BEEP sound output by the speaker 20 can completely meet the auditory requirement of a user, and the inside of the driving circuit 10 has a higher signal conversion accuracy.
The present embodiment further ensures the conversion accuracy and conversion efficiency of the differential information by combining the first voltage adjustment unit 1031 and the second voltage adjustment unit 1032 to convert the pulse width modulation signals, respectively; the first audio driving signal and the second audio driving signal are combined, so that the safety and the accuracy of an audio driving process can be kept, and the application range is wider.
As an alternative implementation, fig. 3 shows another structural schematic of the buzzer driving circuit 10 provided in this embodiment, and compared with the structural schematic of the driving circuit 10 in fig. 1, the driving circuit 10 in fig. 3 further includes: a second audio driver module 106; the second audio driver module 106 is connected to the audio storage device 30 and the first audio driver module 105, and is configured to receive a third audio playing signal output by the audio storage device 30.
The first audio driving module 105 is further configured to drive the speaker 20 to play a preset audio according to the third audio playing signal.
The audio storage device 30 stores audio playing information in advance, so that bidirectional interaction of information can be achieved between the driving circuit 10 and the audio storage device 30, the second audio driving module 106 can acquire the audio playing information in the audio storage device 30 in real time and drive the loudspeaker 20 to send out corresponding audio information according to actual needs of a user, and the driving circuit 10 has high communication compatibility.
The second audio driving module 106 has higher signal input and output stability, outputs the third audio playing signal to the first audio driving module 105 through the second audio driving module 106, analyzes the third audio playing signal through the first audio driving module 105 to obtain audio driving information, and further drives the loudspeaker 20 to play preset audio so as to meet the actual audio-visual requirement of a user; therefore, the first audio driver module 105 in this embodiment can identify the audio control information stored in the audio storage device 30, so as to improve the internal audio driving precision and the signal conversion efficiency of the driver circuit 10, and further, the driver circuit 10 has a more complete audio driving function.
For example, the preset audio includes music, radio stations, etc., and the first audio driving module 105 implements a music playing function according to the audio driving information stored in the audio storage device 30, thereby greatly improving the audio driving precision and efficiency of the driving circuit 10 for the speaker 20; therefore, the first audio driving module 105 in this embodiment can simultaneously drive the speaker 20 to emit common audio information such as music, and can also drive the speaker 20 to emit BEEP sound, thereby satisfying the actual hearing requirement of the user, satisfying the hearing requirement of the user in many aspects, and greatly saving the circuit design cost and the application cost; compared with the traditional technology that the buzzer emits the BEEP sound, the buzzer can only emit the BEEP sound, and can not output common audio contents such as music, radio stations and the like, so that a user needs to additionally set sound amplification equipment to emit the common audio contents such as the music, the radio stations and the like, the cost of audio driving is too high, and the circuit structure is too complex; therefore, the driving circuit 10 in this embodiment has higher audio driving compatibility and extensibility, reduces the audio driving cost, and is generally applicable to different industrial technical fields.
As an alternative implementation, fig. 4 shows a schematic structure of the first audio driver module 105 provided in this embodiment, please refer to fig. 4, where the first audio driver module 105 includes: a first filtering unit 1051, a second filtering unit 1052, and a first audio driving unit 1053; wherein the content of the first and second substances,
the first filtering unit 1051 is connected to the power amplifier module 104 and configured to filter the first audio playing signal.
The second filtering unit 1052 is connected to the power amplifier module 104 and configured to perform filtering processing on the second audio playing signal.
The first filtering unit 1051 and the second filtering unit 1052 have signal filtering functions, and when the power amplifier module 104 outputs the first audio playing signal and the second audio playing signal, the first audio playing signal and the second audio playing signal respectively include partial noise components, and these noise components will cause large interference to the audio driving process of the speaker 20, and affect the quality and the definition of the BEEP sound emitted by the speaker 20; therefore, in this embodiment, the first filtering unit 1051 and the second filtering unit 1052 are combined to perform real-time denoising processing on the first audio playing signal and the second audio playing signal, so as to ensure the transmission accuracy and transmission efficiency of the first audio playing signal and the second audio playing signal, and the audio driving information after filtering processing has higher accuracy and reliability, so as to drive the speaker 20 to emit a better quality BEEP sound, thereby bringing a good hearing experience to a user, and eliminating interference caused by a noise component to the audio driving process of the speaker 20; therefore, in this embodiment, the signal transmission precision and flexibility inside the first audio driver module 105 are higher, and the BEEP sound emitted by the speaker 20 has a higher application range and a higher practical value.
The first audio driving unit 1053 is connected to the power amplifier module 104, the first filtering unit 1051, the second filtering unit 1052 and the speaker 20, and is configured to drive the speaker to play the BEEP sound according to the first audio playing signal after the filtering processing and the second audio playing signal after the filtering processing.
The first audio driving unit 1053 has an audio driving function, and the first audio driving unit 1053 can directly change the sounding state of the speaker 20, so as to improve the accuracy and efficiency of audio driving; the first audio driving unit 1053 and the power amplifier module 104 realize two-way communication, and then the first audio driving unit 1053 can obtain the output state of the audio driving information of the power amplifier module 104 in real time, so as to improve the control response precision of the first audio driving unit 1053; when the first filtering unit 1051 outputs the first audio playing signal after filtering to the first audio driving unit 1053 and the second filtering unit 1052 outputs the second audio playing signal after filtering to the first audio driving unit 1053, the differential driving information can be realized by combining the first audio playing signal and the second audio playing signal, so that the precision and stability of the BEEP sound emitted by the loudspeaker 20 are ensured; therefore, the speaker 20 can be accurately driven by the first audio driving unit 1053 to realize the BEEP sound output function, the audio driving efficiency and the driving precision of the speaker 20 are improved, the audio quality output by the speaker 20 is guaranteed, the audio driving function of the first audio driving module 105 has higher flexibility and expandability, and the practical value is higher.
As an alternative implementation, fig. 5 shows a schematic circuit structure of the first filtering unit 1051 provided in this embodiment, please refer to fig. 5, where the first filtering unit 1051 includes: a first capacitor C1 and a second capacitor C2.
The first end of the first capacitor C1 and the first end of the second capacitor C2 are connected to the power amplifier module 104 and the first audio driver unit 1053; the second terminal of the first capacitor C1 and the second terminal of the second capacitor C2 are connected to the ground GND.
The first audio playing signal can be subjected to real-time filtering processing by utilizing the filtering function of the capacitor and combining the first capacitor C1 and the second capacitor C2, so that the signal filtering accuracy and efficiency of the first capacitor C1 and the second capacitor C2 are maintained; furthermore, the first filtering unit 1051 in this embodiment has a relatively simplified and compatible circuit structure, and can eliminate the interference of the noise component to the audio driving information in real time, thereby improving the efficiency and accuracy of the internal information transmission of the driving circuit 10, and making the quality of the BEEP sound emitted by the speaker 20 better.
As an optional implementation manner, the first filtering unit 1051 includes at least three first filtering capacitors, wherein first ends of the first filtering capacitors are all connected to the power amplifier module 104 and the first audio driving unit 1053, and second ends of the first filtering capacitors are all connected to the ground GND; furthermore, the first filtering unit 1051 has high circuit compatibility and application range, high expandability, and can implement an accurate filtering processing function for the first audio playing signal.
As an optional implementation manner, fig. 6 shows a schematic structure of the second filtering unit 1052 provided in this embodiment, please refer to fig. 6, and the second filtering unit 1052 includes: a third capacitor C3 and a fourth capacitor C4.
The first end of the third capacitor C3 and the first end of the fourth capacitor C4 are connected to the power amplifier module 104 and the first audio driver unit 1053; the second terminal of the third capacitor C3 and the second terminal of the fourth capacitor C4 are connected to the ground GND.
When power amplifier module 104 outputs the second audio playback signal, combine third electric capacity C3 and fourth electric capacity C4 can realize the filtering function to the second audio playback signal, with guarantee audio drive's precision and efficiency, second filtering unit 1052 has comparatively simplified circuit structure, the second audio playback signal through filtering processing has higher signal precision and accuracy, and then drive loudspeaker 20 and realize accurate BEEP sound and send out the function, the internal circuit structure and the audio drive cost of first audio drive module 105 have been reduced, brought more convenient use experience for the user.
As an optional implementation manner, the second filtering unit 1052 includes at least three second filtering capacitors, wherein the first ends of the plurality of second filtering capacitors are all connected to the power amplifier module 104 and the first audio driving unit 1053, the second ends of the plurality of second filtering capacitors are all connected to GND, the circuit structure of the second filtering unit 1052 has higher expandability, and the plurality of filtering capacitors can be combined to realize a better filtering processing function for the second audio playing signal, so as to drive the speaker 20 to achieve a better sound production effect, and the practical value is higher.
As an alternative implementation, fig. 7 shows a schematic circuit structure of the first audio driver unit 1053 provided in this embodiment, please refer to fig. 7, where the first audio driver unit 1053 includes: the circuit comprises a first variable resistor RT1, a second variable resistor RT2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a fifth capacitor C5.
A first end of the first resistor R1 is connected to the power amplifier module 104, and the power amplifier module 104 outputs a first audio playing signal to the first audio driving unit 1053; the first end of the second resistor R2 is connected to the power amplifier module 104, and the power amplifier module 104 outputs the second audio playing signal to the first end of the second resistor R2, so that the driving function of the differential signal can be realized by combining the first audio playing signal and the second audio playing signal; a first terminal of the first variable resistor RT1, a second terminal of the first resistor R1, a first terminal of the fifth capacitor C5, and a first terminal of the third resistor R3 are commonly connected to the first filtering unit 1051, and a second terminal of the first variable resistor RD1 is grounded to GND.
A first terminal of the second variable resistor RD2, a second terminal of the second resistor R2, a second terminal of the fifth capacitor C5, and a first terminal of the fourth resistor R4 are commonly connected to the second filter unit 1052, a second terminal of the second variable resistor RD2 is connected to the ground GND, a second terminal of the third resistor R3 is connected to the positive-going signal input terminal of the horn 20, and a second terminal of the fourth resistor R4 is connected to the negative-going signal input terminal of the horn 20.
Wherein the resistance values of both the first variable resistor RD1 and the second variable resistor RD2 are adjustable, which greatly ensures audio driving compatibility and stability of the first audio driving unit 1053.
Therefore, the first audio driving unit 1053 in this embodiment has a relatively compatible circuit structure, and after transmitting the filtered first audio playing signal and the filtered second audio playing signal, the speaker 20 can be directly driven to implement the BEEP sound output function, thereby greatly simplifying the driving control steps of the BEEP sound.
As an optional implementation manner, fig. 8 shows a schematic circuit structure of the first voltage regulating unit 1031 and the second voltage regulating unit 1032 provided in this embodiment, please refer to fig. 8, where the first voltage regulating unit 1031 includes: a sixth capacitor C6, a fifth resistor R5, and a sixth resistor R6.
A first end of the sixth capacitor C6 is connected to the first signal output module 101, a second end of the sixth capacitor C6 is connected to a first end of the fifth resistor R5, a second end of the fifth resistor R5 and a first end of the sixth resistor R6 are connected to the power amplifier module 104, and a second end of the sixth resistor R6 is connected to the GND.
The fifth resistor R5 and the sixth resistor R6 are used for voltage division, and the voltage of the first pwm signal can be adjusted through the sixth resistor R6, so as to ensure the transmission efficiency and control accuracy of the first audio driving signal.
The second voltage adjusting unit 1032 includes: a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a seventh resistor R7, an eighth resistor R8 and a ninth resistor R9.
The first end of the seventh capacitor C7 is connected to the second signal output module 102, the second signal output module 102 outputs the second pwm signal to the first end of the seventh capacitor C7, the second end of the seventh capacitor C7 is connected to the first end of the seventh resistor R7, the second end of the seventh resistor R7 is connected to the first end of the eighth capacitor C8, the first end of the ninth capacitor C9 is grounded GND, the second end of the ninth capacitor C9 is connected to the first end of the eighth resistor R8, the second end of the eighth resistor R8, the second end of the eighth capacitor C8 and the first end of the ninth resistor R9 are connected to the power amplifier module 104, and the second end of the ninth resistor R9 is grounded GND.
The voltage regulating function can be achieved through the seventh resistor R7, the voltage of the second pulse width modulation signal is regulated through the seventh resistor R7, the voltage of the second audio driving signal can be within a preset range, the voltage regulation precision of the second pulse width modulation signal is greatly improved, the signal conversion efficiency is improved, and the audio driving precision is higher.
As an alternative implementation, fig. 9 shows another structural schematic of the driving circuit 10 provided in this embodiment, and compared with the structural schematic of the driving circuit 10 in fig. 1, the driving circuit 10 in fig. 9 further includes: the power module 107, the power module 107 is connected to the signal conversion module 103, the power amplifier module 104 and the first audio driver module 105, and is configured to output a power signal to supply power to the signal conversion module 103, the power amplifier module 104 and the first audio driver module 105.
Illustratively, the power module 107 generates a first power signal, a second power signal and a third power signal, outputs the first power signal to the signal conversion module 103, outputs the second power signal to the power amplifier module 104, and outputs the third power signal to the first audio driving module 105, which is beneficial to improving the internal power supply safety and reliability of the driving circuit 10.
Wherein power module 107 has the power supply function, can ensure the power-on security and the stability of drive circuit 10's internal circuit module through power signal, the inside circuit module of drive circuit 10 can be in rated running state, and then drive circuit 10 can carry out fast, compatible conversion and transmission back to audio frequency control information, in order to realize to loudspeaker 20 high speed, nimble drive function, the BEEP sound that loudspeaker 20 sent has higher stability and reliability, it is better to have brought the use experience for the user.
As an alternative implementation, fig. 10 shows a schematic structure of the mobile terminal 100 with a buzzer output function provided in this embodiment, please refer to fig. 10, where the mobile terminal 100 includes: the loudspeaker 20 and the driving circuit 10 as described above, the driving circuit 10 is connected to the loudspeaker 20, and the driving circuit 10 is used for driving the loudspeaker 20 to play the BEEP sound; illustratively, the speaker 20 is designed with a symmetrical package, which greatly ensures the safety and stability of the BEEP sound output of the speaker 20.
Referring to the embodiments of fig. 1 to 9, in the present embodiment, the driving circuit 10 can directly drive the speaker 20 to realize an audio playing function, so as to generate a corresponding BEEP sound, thereby greatly simplifying the audio driving cost and the audio driving step of the BEEP sound, the mobile terminal 100 has lower circuit manufacturing cost and application cost, the space volume of the mobile terminal 100 is saved, higher convenience is brought to the user, and the practical value is higher; therefore, the problems that in the prior art, the drive cost of the BEEP sound of the mobile terminal is high, the audio drive step is complex, the audio drive cost and the circuit manufacturing cost of the mobile terminal are improved, and the use experience of a user is poor are effectively solved.
Various embodiments are described herein for various devices, circuits, apparatuses, systems, and/or methods. Numerous specific details are set forth in order to provide a thorough understanding of the overall structure, function, manufacture, and use of the embodiments as described in the specification and illustrated in the accompanying drawings. However, it will be understood by those skilled in the art that the embodiments may be practiced without such specific details. In other instances, well-known operations, components and elements have been described in detail so as not to obscure the embodiments in the description. It will be appreciated by those of ordinary skill in the art that the embodiments herein and shown are non-limiting examples, and thus, it can be appreciated that the specific structural and functional details disclosed herein may be representative and do not necessarily limit the scope of the embodiments.
Reference throughout the specification to "various embodiments," "in an embodiment," "one embodiment," or "an embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of the phrases "in various embodiments," "in some embodiments," "in one embodiment," or "in an embodiment," or the like, in places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Thus, a particular feature, structure, or characteristic illustrated or described in connection with one embodiment may be combined, in whole or in part, with features, structures, or characteristics of one or more other embodiments without presuming that such combination is not an illogical or functional limitation. Any directional references (e.g., plus, minus, upper, lower, upward, downward, left, right, leftward, rightward, top, bottom, above …, below …, vertical, horizontal, clockwise, and counterclockwise) are used for identification purposes to aid the reader's understanding of the present disclosure, and do not create limitations, particularly as to the position, orientation, or use of the embodiments.
Although certain embodiments have been described above with a certain degree of particularity, those skilled in the art could make numerous alterations to the disclosed embodiments without departing from the scope of this disclosure. Joinder references (e.g., attached, coupled, connected, and the like) are to be construed broadly and may include intermediate members between a connection of elements and relative movement between elements. Thus, connection references do not necessarily imply that two elements are directly connected/coupled and in a fixed relationship to each other. The use of "for example" throughout this specification should be interpreted broadly and used to provide non-limiting examples of embodiments of the disclosure, and the disclosure is not limited to such examples. It is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative only and not limiting. Changes in detail or structure may be made without departing from the disclosure.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.
Claims (10)
1. A buzzer driving circuit, comprising:
a first signal output module configured to output a first pulse width modulation signal;
a second signal output module configured to output a second pulse width modulation signal;
the signal conversion module is connected with the first signal output module and the second signal output module, and is configured to convert the first pulse width modulation signal into a first audio driving signal and convert the second pulse width modulation signal into a second audio driving signal;
the power amplification module is connected with the signal conversion module and is configured to amplify the power of the first audio driving signal to obtain a first audio playing signal and amplify the power of the second audio driving signal to obtain a second audio playing signal; and
and the first audio driving module is connected with the power amplifier module and the loudspeaker and is configured to drive the loudspeaker to play buzzing sound according to the first audio playing signal and the second audio playing signal.
2. The buzzer sound driving circuit of claim 1, wherein the signal conversion module comprises:
the first voltage regulating unit is connected with the first signal output module and the power amplifier module and is configured to regulate the voltage of the first pulse width modulation signal to obtain the first audio driving signal; and
and the second voltage regulating unit is connected with the second signal output module and the power amplifier module and is configured to regulate the voltage of the second pulse width modulation signal to obtain the second audio driving signal.
3. The buzzer driving circuit according to claim 1, further comprising:
the second audio driving module is connected with an audio storage device and the first audio driving module and is configured to receive a third audio playing signal output by the audio storage device;
the first audio driving module is further configured to drive the loudspeaker to play a preset audio according to the third audio playing signal.
4. The buzzer sound driving circuit of claim 1, wherein the first audio driving module comprises:
the first filtering unit is connected with the power amplification module and is configured to filter the first audio playing signal;
the second filtering unit is connected with the power amplification module and is configured to filter the second audio playing signal; and
the first audio driving unit is connected with the power amplifier module, the first filtering unit, the second filtering unit and the loudspeaker and is configured to drive the loudspeaker to play buzzing sound according to the first audio playing signal after filtering processing and the second audio playing signal after filtering processing.
5. The buzzer sound driving circuit of claim 4, wherein the first filtering unit comprises:
a first capacitor and a second capacitor;
the first end of the first capacitor and the first end of the second capacitor are connected with the power amplifier module and the first audio driving unit;
the second end of the first capacitor and the second end of the second capacitor are connected to the ground in common.
6. The buzzer sound driving circuit of claim 4, wherein the second filtering unit comprises:
a third capacitor and a fourth capacitor;
the first end of the third capacitor and the first end of the fourth capacitor are connected with the power amplifier module and the first audio driving unit;
and the second end of the third capacitor and the second end of the fourth capacitor are connected to the ground in common.
7. The buzzer sound driving circuit of claim 4, wherein the first audio driving unit comprises:
a first variable resistor, a second variable resistor, a first resistance, a second resistance, a third resistance, a fourth resistance, and a fifth capacitance;
the first end of the first resistor is connected with the power amplifier module, the first end of the second resistor is connected with the power amplifier module, the first end of the first variable resistor, the second end of the first resistor, the first end of the fifth capacitor and the first end of the third resistor are connected to the first filtering unit in common, and the second end of the first variable resistor is grounded;
the first end of the second variable resistor, the second end of the second resistor, the second end of the fifth capacitor and the first end of the fourth resistor are connected to the second filtering unit in common, the second end of the second variable resistor is grounded, the second end of the third resistor is connected to the positive signal input end of the horn, and the second end of the fourth resistor is connected to the negative signal input end of the horn.
8. The buzzer sound driving circuit of claim 2, wherein the first voltage regulating unit includes:
a sixth capacitor, a fifth resistor and a sixth resistor;
the first end of the sixth capacitor is connected with the first signal output module, the second end of the sixth capacitor is connected with the first end of the fifth resistor, the second end of the fifth resistor and the first end of the sixth resistor are connected with the power amplification module in a shared mode, and the second end of the sixth resistor is grounded;
the second voltage adjusting unit includes:
a seventh capacitor, an eighth capacitor, a ninth capacitor, a seventh resistor, an eighth resistor, and a ninth resistor;
the first end of the seventh capacitor is connected with the second signal output module, the second end of the seventh capacitor is connected with the first end of the seventh resistor, the second end of the seventh resistor is connected with the first end of the eighth capacitor, the first end of the ninth capacitor is grounded, the second end of the ninth capacitor is connected with the first end of the eighth resistor, the second end of the eighth capacitor and the first end of the ninth resistor are connected with the power amplifier module in common, and the second end of the ninth resistor is grounded.
9. The buzzer driving circuit according to claim 1, further comprising:
and the power module is connected with the signal conversion module, the power amplifier module and the first audio driving module, and is configured to output a power signal so as to supply power to the signal conversion module, the power amplifier module and the first audio driving module.
10. A mobile terminal having a buzzer sound output function, comprising:
a horn; and
the driving circuit according to any one of claims 1 to 9, wherein the driving circuit is connected to the speaker, and the driving circuit is configured to drive the speaker to play a buzzer sound.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921514657.4U CN210670527U (en) | 2019-09-11 | 2019-09-11 | Drive circuit and mobile terminal of buzzing sound |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921514657.4U CN210670527U (en) | 2019-09-11 | 2019-09-11 | Drive circuit and mobile terminal of buzzing sound |
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| CN210670527U true CN210670527U (en) | 2020-06-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112969127A (en) * | 2021-02-19 | 2021-06-15 | 联想(北京)有限公司 | Electronic equipment and audio output method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112969127A (en) * | 2021-02-19 | 2021-06-15 | 联想(北京)有限公司 | Electronic equipment and audio output method |
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