CN116055950B - Speaker driving circuit and electronic device - Google Patents

Speaker driving circuit and electronic device Download PDF

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Publication number
CN116055950B
CN116055950B CN202210515695.1A CN202210515695A CN116055950B CN 116055950 B CN116055950 B CN 116055950B CN 202210515695 A CN202210515695 A CN 202210515695A CN 116055950 B CN116055950 B CN 116055950B
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resistor
electrically connected
module
circuit
operational amplifier
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CN116055950A (en
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王会文
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Honor Device Co Ltd
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Honor Device Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/007—Protection circuits for transducers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The application provides a loudspeaker driving circuit and an electronic device. The loudspeaker driving circuit comprises a control chip; several sets of driving circuits: the intelligent power amplifier comprises an intelligent power amplifier module, a sampling module, a plurality of filtering modules and a plurality of analog power amplifier modules. The intelligent power amplifier module is electrically connected to the control chip and the first loudspeaker. The sampling module is electrically connected to the intelligent power amplifier module and the plurality of filtering modules. The filtering modules are respectively connected with the analog power amplifier modules. The plurality of analog power amplifier modules are respectively connected with the plurality of second speakers. The intelligent power amplification module processes the initial audio signal output by the control chip to output a first target audio signal to the first loudspeaker. The sampling module is used for sampling the first target audio signal so as to output an analog sampling signal to the plurality of filtering modules. The sampling module is also used for adjusting the voltage output by the intelligent power amplification module to the analog power amplification module. The loudspeaker driving circuit provided by the application has lower cost and better loudspeaker driving effect.

Description

Speaker driving circuit and electronic device
Technical Field
The present application relates to the field of audio circuits, and in particular, to a speaker driving circuit and an electronic device.
Background
More and more electronic devices provide multiple speakers to enhance the user's listening experience. In the existing multi-speaker scheme, a plurality of intelligent power amplifiers (Smart PA) are generally used to drive corresponding speakers respectively. Multiple Smart PAs are interconnected by a time division multiplexed (Time Division Multiplexing, TDM) bus, which is relatively complex in circuitry. And Smart PA is also more expensive than analog power amplifiers. Thus, the manufacturing cost of the traditional speaker driving circuit of the multi-speaker is high, and the circuit is complex.
Disclosure of Invention
Based on the above problems, embodiments of the present application provide a speaker driving circuit and an electronic device with low manufacturing cost.
An embodiment of the present application provides a speaker driving circuit, including a control chip and a plurality of sets of driving circuits electrically connected to the control chip. Each group of driving circuit comprises an intelligent power amplifier module, a sampling module, a plurality of filtering modules and a plurality of analog power amplifier modules. One end of the intelligent power amplification module is electrically connected to the control chip, the other end of the intelligent power amplification module is electrically connected to the first loudspeaker, the sampling module is electrically connected to the intelligent power amplification module and the plurality of filtering modules, the plurality of filtering modules are connected with the plurality of simulation power amplification modules in a one-to-one correspondence manner, and the plurality of simulation power amplification modules are respectively connected with the plurality of second loudspeakers in a one-to-one correspondence manner. The intelligent power amplifier module is used for processing the initial audio signal output by the control chip so as to output a first target audio signal to the first loudspeaker. The sampling module is used for sampling the first target audio signal so as to output an analog sampling signal to the plurality of filtering modules. The sampling module is also used for adjusting the voltage output by the intelligent power amplification module to the analog power amplification module. The filtering modules are used for filtering the analog sampling signals to output analog audio signals to the analog power amplification module. The plurality of analog power amplifier modules are used for amplifying the power of the analog audio signals and outputting second target audio signals to the second loudspeaker so as to drive the second loudspeaker to play sound. Therefore, compared with the traditional loudspeaker driving circuit in which each loudspeaker is correspondingly connected with an intelligent power amplifier, the loudspeaker driving circuit provided by the application reduces the number of the intelligent power amplifiers and can reduce the manufacturing cost. Meanwhile, the sampling module provided by the application can adjust the voltage output by the intelligent power amplification module to the analog power amplification module so as to meet the requirement of the input voltage of the analog power amplification module and protect the analog power amplification module.
In one possible implementation, the sampling module includes an operational amplifier. The operational amplifier is used for realizing the sampling of the first target audio signal and adjusting the current proportion between the output of the intelligent power amplifier module to the first loudspeaker and the analog power amplifier module. According to the design, the operational amplifier is arranged in the sampling module, and the current flowing to the first loudspeaker by the intelligent power amplifier module is far greater than the current flowing to the analog power amplifier module by the characteristic of high input impedance of the operational amplifier. Furthermore, the common mode signal component and the differential mode signal component in the sampled signal are well reserved through the operational amplifier, so that the signal-to-noise ratio of the sampled signal obtained by the sampling module is improved; meanwhile, the power of the sampling signal is amplified by the operational amplifier in a proper proportion, so that the signal distortion phenomenon of the analog power amplifier module output to the second loudspeaker is reduced.
In a possible embodiment, the sampling module comprises a conversion circuit for converting the signal sampled by the sampling module into an analog sampled signal. The design is that the integration unit is arranged, so that the sampling signal output by the sampling module can be output to the analog power amplifier module through the filtering module.
In one possible implementation, the sampling module comprises two sampling units. The two sampling units are respectively and electrically connected to the two output ends of the intelligent power amplifier module so as to sample signals of the two output ends.
In one possible implementation, the sampling unit comprises a voltage follower circuit. The voltage follower circuit includes an operational amplifier. The non-inverting input end of the operational amplifier is correspondingly and electrically connected to one output end of the intelligent power amplifier module, and the inverting input end of the operational amplifier is electrically connected to the output end of the operational amplifier.
In one possible embodiment, the sampling unit further comprises a conditioning circuit. The conditioning circuit is electrically connected to the output of the operational amplifier. The conditioning circuit is used for adjusting the voltage of the signal output by the voltage follower circuit so that the voltage of the sampling signal output by the sampling unit meets the voltage requirement of the input end of the analog power amplifier module.
In one possible implementation, the sampling unit includes an in-phase proportional amplifying circuit. The in-phase proportional amplifying circuit comprises an operational amplifier, a first resistor, a second resistor, a third resistor and a fourth resistor. The first resistor is correspondingly and electrically connected to one output end of the intelligent power amplifier module. The other end of the first resistor is electrically connected to the non-inverting input terminal of the operational amplifier. One end of the second resistor is electrically connected between the first resistor and the non-inverting input end of the operational amplifier, and the other end of the second resistor is grounded. One end of the third resistor is electrically connected to the inverting input end of the operational amplifier, and the other end of the third resistor is grounded. One end of the fourth resistor is electrically connected to the inverting input end of the operational amplifier, and the other end of the fourth resistor R4 is electrically connected to the output end of the operational amplifier. The design samples the signal output by the intelligent power amplification module by setting the in-phase proportional amplification circuit, and simultaneously enables the voltage output by the sampling module to meet the voltage requirement of the input end of the analog power amplification module.
In one possible implementation, the sampling unit includes an inverting proportional amplifying circuit. The inverting proportional amplifying circuit comprises an operational amplifier, a first resistor and a second resistor. One end of the first resistor is correspondingly and electrically connected to one output end of the intelligent power amplifier module, the other end of the first resistor is electrically connected to the inverting input end of the operational amplifier, the non-inverting input end of the operational amplifier is grounded, one end of the second resistor is electrically connected between the first resistor and the inverting input end of the operational amplifier, and the other end of the second resistor is electrically connected to the output end of the operational amplifier. The design samples the signal output by the intelligent power amplification module by arranging the reverse phase proportional amplification circuit, and simultaneously, the voltage output by the sampling module meets the voltage requirement of the input end of the analog power amplification module.
In a possible embodiment, the sampling unit further comprises a conversion circuit. The conversion circuit is used for converting a signal obtained by sampling by the voltage follower circuit, the in-phase proportional amplifying circuit or the anti-phase proportional amplifying circuit into an analog sampling signal.
In one possible implementation, the sampling module includes a fully differential amplification circuit. The fully differential amplifying circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor and an operational amplifier. One end of the first resistor is electrically connected to the output end of the intelligent power amplifier module, the other end of the first resistor is electrically connected to the inverting input end of the operational amplifier, one end of the second resistor is electrically connected between the first resistor and the inverting input end, the other end of the second resistor is electrically connected to the first output end of the operational amplifier, one end of the third resistor is electrically connected to the other output end of the intelligent power amplifier module, the other end of the third resistor is electrically connected to the non-inverting input end of the operational amplifier, one end of the fourth resistor is electrically connected between the third resistor and the non-inverting input end, and the other end of the fourth resistor is electrically connected to the second output end of the operational amplifier. The design samples signals output by the two output ends of the intelligent power amplification module through the fully differential amplification circuit, and meanwhile, the voltage output by the sampling module meets the voltage requirement of the input end of the analog power amplification module.
In one possible implementation, the sampling module includes a differential amplification circuit. The differential amplifying circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor and an operational amplifier. One end of the first resistor is electrically connected to an output end of the intelligent power amplifier module, the other end of the first resistor is electrically connected to an inverting input end of the operational amplifier, one end of the second resistor is electrically connected to the other output end of the intelligent power amplifier module, the other end of the second resistor is electrically connected to an in-phase input end of the operational amplifier, one end of the third resistor is electrically connected between the first resistor and the inverting input end, the other end of the third resistor is electrically connected to an output end of the operational amplifier, one end of the fourth resistor is electrically connected between the second resistor and the in-phase input end of the operational amplifier, and the other end of the fourth resistor is grounded. The differential amplification circuit is used for sampling signals output by two output ends of the intelligent power amplification module, and meanwhile, the voltage output by the sampling module meets the voltage requirement of the input end of the analog power amplification module.
In one possible implementation, the sampling module includes an instrumentation amplifier circuit. The instrument amplifier circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first operational amplifier, a second operational amplifier and a third operational amplifier. The non-inverting input end of the first operational amplifier is electrically connected to an output end of the intelligent power amplifier module, the inverting input end of the first operational amplifier is electrically connected to one end of the first resistor, the other end of the first resistor is electrically connected to the output end of the first operational amplifier, the non-inverting input end of the second operational amplifier is electrically connected to the other output end of the intelligent power amplifier module, the inverting input end of the second operational amplifier is electrically connected to one end of the third resistor, the other end of the third resistor is electrically connected to the output end of the second operational amplifier, one end of the second resistor is electrically connected between the inverting input end of the first operational amplifier and the first resistor, the other end of the second resistor is electrically connected between the inverting input end of the second operational amplifier and the third resistor, one end of the fourth resistor is electrically connected to the inverting input end of the third operational amplifier, one end of the fifth resistor is electrically connected to the other end of the third operational amplifier, the other end of the fifth resistor is electrically connected to the non-inverting input end of the third operational amplifier, the sixth resistor is electrically connected to the other end of the seventh operational amplifier, and the non-inverting input end of the third resistor is electrically connected to the other end of the seventh operational amplifier. The design samples signals output by the two output ends of the intelligent power amplification module through the instrument amplifier circuit, and meanwhile, the voltage output by the sampling module meets the voltage requirement of the input end of the analog power amplification module.
In one possible implementation, the sampling module further comprises a conversion circuit. The full differential amplifying circuit is electrically connected to the filtering module through the converting circuit, or the instrument amplifier circuit is electrically connected to the filtering module through the converting circuit. The conversion circuit is used for converting signals output by the full-differential amplification circuit, the differential amplification circuit or the instrument amplifier circuit into analog sampling signals and outputting the analog sampling signals to the filtering module.
In one possible implementation, the analog audio signals output by the plurality of filtering modules at least include any two of a low frequency signal, an intermediate frequency signal, and a high frequency signal.
The second aspect of the application also provides an electronic device comprising a loudspeaker drive circuit as claimed in any one of the preceding claims.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following description will briefly describe the drawings in the embodiments, it being understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art circuit of a multi-speaker connection with a plurality of intelligent power amplifiers;
FIG. 2 is a schematic diagram of an electronic device according to an embodiment of the present application;
fig. 3 is a functional block diagram of a speaker driving circuit applied to the electronic device shown in fig. 2;
FIG. 4 is a schematic diagram showing distortion of signals output by an analog power amplifier module in a conventional speaker driving circuit;
fig. 5 is a circuit block diagram of a speaker driving circuit according to an embodiment of the present application;
fig. 6 is a circuit block diagram of a speaker driving circuit according to an embodiment of the present application;
fig. 7 is a circuit block diagram of a speaker driving circuit according to an embodiment of the present application;
fig. 8 is a circuit block diagram of a speaker driving circuit according to an embodiment of the present application;
fig. 9 is a circuit block diagram of a speaker driving circuit according to an embodiment of the present application;
fig. 10 is a circuit block diagram of a speaker driving circuit according to an embodiment of the present application.
Description of main reference numerals:
an electronic device 200; speaker driving circuits 100, 100a, 100b, 100c, 100d, 100e, 100f;
a control chip 10; a driving circuit 20; an intelligent power amplifier module 21; sampling modules 22, 22a, 22b, 22c, 22d, 22e, 22f; sampling units 221a, 221b, 221c, 222a, 222b, 222c; the filtering modules 23, 231a, 232a, 231e, 232e; an analog power amplifier module 24; speakers 251, 252, 253; EMI suppression circuitry 26.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "or/and" as used herein includes any and all combinations of one or more of the associated listed items.
Some embodiments of the application are described in detail. The following embodiments and features of the embodiments may be combined with each other without collision.
More and more electronic devices such as tablet computers and displays are provided with a plurality of loudspeakers so as to improve the audio playing quality of the electronic devices. In the existing multi-speaker scheme, a plurality of intelligent power amplifiers (Smart PA) are generally used to drive corresponding speakers respectively. Multiple Smart PAs are interconnected by a time division multiplexed (Time Division Multiplexing, TDM) bus, which is relatively complex in circuitry. For example, referring to fig. 1, fig. 1 is a schematic diagram of a speaker driving circuit in a conventional multi-speaker scheme. In fig. 1, 4 Smart PAs are respectively connected to 4 speakers SPK, and 4 Smart PAs are connected to the same TDM bus, thus making the speaker driving circuit complex. And since Smart PA is more expensive than analog PA, the manufacturing cost of the speaker driving circuit shown in fig. 1 is also high.
With continued reference to fig. 3, the present application provides a speaker driving circuit 100 applied to an electronic device 200 (refer to fig. 2). The electronic device 200 comprises at least a first speaker, such as speaker (1, 1), and a number of second speakers, such as speaker (1, 2) … … speaker (1, n) (see fig. 3). The speaker driving circuit 100 is used for driving a first speaker and a plurality of second speakers on the electronic device 200 to realize that at least two speakers of the electronic device 200 output sound signals.
It is understood that the electronic device 200 according to the embodiment of the present application may include, but is not limited to, a mobile terminal or a fixed terminal such as a mobile phone, a tablet computer, a notebook computer, an ultra-mobile personal computer (UMPC), a handheld computer, an intercom, a netbook, a Point of sale (POS) device, a personal digital assistant (personal digital assistant, PDA), a wearable device, a virtual reality device, a wireless U-disc, a bluetooth sound/earphone, a vehicle-mounted device, a car-recorder, a security device, or a medical device. The present application uses the electronic device 200 as a tablet pc as an example to illustrate the working principle of the speaker driving circuit 100.
Referring to fig. 3, the speaker driving circuit 100 includes a control chip 10 and a plurality of sets of driving circuits 20 electrically connected to each other. The control chip 10 is configured to output an initial audio signal to a plurality of sets of driving circuits 20, and each set of driving circuits 20 is configured to perform corresponding amplification and filtering processing on the received initial audio signal, so as to output a corresponding target audio signal to a corresponding speaker, thereby driving the speaker to emit sound.
In some embodiments, the control chip 10 may be an analog baseband chip, a central processing unit (Central Processing Unit, CPU), or other general purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), or a microprocessor, etc. that may output audio signals.
Each group of driving circuits 20 comprises an intelligent power amplifier module 21, a sampling module 22, a plurality of filtering modules 23 and a plurality of analog power amplifier modules 24.
The intelligent power amplifier module 21 is electrically connected to the control chip 10 at one end and to a first speaker, such as speaker (1, 1), at the other end. One end of the sampling module 22 is electrically connected to the output end of the intelligent power amplifier module 21, and the other end is electrically connected to a plurality of filtering modules 23. The output end of each filter module 23 is also electrically connected to a corresponding analog power amplifier module 24. Each analog power amplifier module 24 is electrically connected to a corresponding second speaker, e.g., speaker (1, 2) to speaker (1, n), respectively.
The intelligent power amplifier module 21 is configured to receive and process the initial audio signal output by the control chip 10, so as to output a first target audio signal to the first speaker (1, 1), thereby driving the first speaker (1, 1) to play sound. And the first target audio signal is a pulse width modulated (Pulse width modulation, PWM) signal, i.e., the first target audio signal is a digital signal.
It will be appreciated that the Smart power amplifier module 21 includes a Smart power amplifier (Smart Power Amplifier, smart PA for short). The intelligent power amplifier can monitor the output current and voltage in real time through a current sensor or a voltage sensor (I/V sensor), further calculate an impedance value to judge the temperature and the amplitude of a coil of a corresponding connected loudspeaker, such as a first loudspeaker (1, 1), and then dynamically adjust the output power according to the calculated impedance value, so that the output power of the loudspeaker (1, 1) can be improved as much as possible on the basis of protecting the first loudspeaker, such as the loudspeaker (1, 1), and the sound quality of sound output by the loudspeaker (1, 1) is improved.
The sampling module 22 is configured to sample the first target audio signal output by the intelligent power amplifier module 21, so as to output an analog sampling signal to the filtering module 23.
The filtering module 23 is configured to perform filtering processing on the analog sampled signal output by the sampling module 22, so as to output an analog audio signal to the analog power amplifier module 24.
The analog power amplifier module 24 is configured to amplify and process the power of the received analog audio signal accordingly, so as to output a second target audio signal to a corresponding second speaker, for example, speakers (1, 1) to (1, n), so as to drive the speakers to play sound. In an embodiment of the present application, the analog power amplifier module 24 comprises an analog power amplifier.
The speaker driving circuit 100 provided by the application samples a first target audio signal output by the intelligent power amplification module 21 through the sampling module 22, and outputs the sampled signal to the plurality of analog power amplification modules 24 through the filtering module 23. Thus, the ends of the intelligent power amplifier module 21 and the analog power amplifier modules 24 are respectively connected with the speakers, so that a plurality of speakers can be driven to play sound simultaneously.
The sampling module 22 is further configured to adjust voltages output from the intelligent power amplifier module 21 to the plurality of analog power amplifier modules 24. It will be appreciated that since the voltage output by the intelligent power amplifier module 21 is greater than the voltage requirement at the input of the analog power amplifier module 24. Thus, in the embodiment of the present application, the sampling module 22 adjusts the voltages output by the intelligent power amplifier module 21 to the plurality of analog power amplifier modules 24, so that the voltages received by the plurality of analog power amplifier modules 24 conform to the working requirements, thereby protecting the plurality of analog power amplifier modules 24.
On the other hand, the speaker driving circuit 100 further adjusts the current ratio between the intelligent power amplifier module 21 and the first speaker, for example, the speaker (1, 1) and the plurality of analog power amplifier modules 24, through the sampling module 22, so that the current output by the intelligent power amplifier module 21 flows more to the first speaker, and the influence on the current sensor and/or the voltage sensor of the intelligent power amplifier module 21 is reduced while the sound playing effect of the first speaker is ensured, so that the first target audio signal output by the intelligent power amplifier module 21 maintains a better driving effect, and the signal sampled by the sampling module 22 maintains a better driving effect.
In an embodiment of the present application, the sampling module 22 includes an operational amplifier. It will be appreciated that since the operational amplifier has a higher input impedance, the current of the first target audio signal output by the smart power amplifier module 21 will flow more to the first speaker, e.g. speaker (1, 1). That is, when the current flowing to the first speaker by the intelligent power amplifier module 21 is I 1 The current flowing to the analog power amplifier module 24 by the intelligent power amplifier module 21 through the sampling module 22 is I 2 At this time, since the operational amplifier provided by the sampling module 22 has a high input impedance, I 1 Far greater than I 2 . In this way, while ensuring the sound playing quality of the first speaker, the influence on the output end of the intelligent power amplifier module 21 can be reduced, thereby reducing the current sensor and/or voltage sensor of the intelligent power amplifier module 21And the influence of the same to ensure the sound quality of the speaker driven by the speaker driving circuit 100.
Furthermore, due to the power amplification function of the operational amplifier, the operational amplifier in the sampling module 22 can also reduce the signal distortion phenomenon (please refer to fig. 4) of the second target audio signal output by the analog power amplification module 24; and the operational amplifier can better reserve the common mode signal component and the differential mode signal component in the sampled signal, so that the signal-to-noise ratio of the output sampled signal is further improved, the signal-to-noise ratio of the second target audio signal is further improved, and the sound playing quality of the second loudspeaker (such as the loudspeaker (1, 2) to the loudspeaker (N, N)) is ensured.
The application is not limited to the specific circuitry of the sampling module 22. For example, in other embodiments, the sampling module 22 may also implement the functions of sampling, voltage regulation, and current regulation described above by providing other electronics.
With continued reference to fig. 5 to 10, the embodiment of the present application further provides several speaker driving circuits (e.g. speaker driving circuits 100a/100b/100c/100d/100e/100 f), and the sampling module 22 of the speaker driving circuit includes an operational amplifier to drive several speakers simultaneously.
Referring to fig. 5, an embodiment of the application provides a speaker driving circuit 100a. The speaker driving circuit 100a is identical to the circuit block of the speaker driving circuit 100. In the present embodiment, the specific circuit configurations of the sampling module 22a and the filtering module 231a/232a in the speaker driving circuit 100a are specifically described.
In the present embodiment, the sampling module 22a includes two sampling units, such as a sampling unit 221a and a sampling unit 222a. The sampling units 221a and 222a are electrically connected to two output ends of the intelligent power amplifier module 21, respectively, and are configured to sample two paths of PWM signals output by the intelligent power amplifier module 21.
In the embodiment of the present application, the sampling unit 221a has the same circuit configuration as the sampling unit 222a. In the present embodiment, a specific circuit configuration will be described taking the sampling unit 221a as an example. In an embodiment of the present application, the sampling unit 221a includes a voltage follower circuit. And the voltage follower circuit includes an operational amplifier OP1.
The non-inverting input terminal of the operational amplifier OP1 is electrically connected to the first output terminal OUT1 of the intelligent power amplifier module 21, and the inverting input terminal of the operational amplifier OP1 is electrically connected to the output terminal of the operational amplifier OP1. In this way, the operational amplifier OP1 forms a voltage follower circuit at the first output terminal OUT1 of the intelligent power amplifier module 21 to collect the signal output by the first output terminal OUT 1. Meanwhile, since the input end of the operational amplifier OP1 has a higher impedance, the current output by the intelligent power amplifier module 21 flows to the first speaker, for example, the speaker 251, so that the influence of the sampling module 22a on the output end of the intelligent power amplifier module 21 is effectively reduced.
It will be appreciated that the voltage variation at the output of the voltage follower circuit follows the voltage variation at the input and that the amplification ratio of the voltage follower circuit is always less than 1. Further, the sampling unit 221a further includes a conditioning circuit. The conditioning circuit is used for adjusting the voltage of the signal output by the operational amplifier OP1, so that the signal output by the voltage follower circuit better matches the gain of the analog power amplifier module 24 and meets the voltage requirement of the input end of the analog power amplifier module 24, and finally, the power of the second target analog signal is improved, so that the second loudspeaker connected with the analog power amplifier module 24 has better playing quality. In an embodiment of the application, the conditioning circuit is electrically connected to the output of the voltage follower circuit. And the conditioning circuit comprises a first resistor R1 and a second resistor R2.
One end of the first resistor R1 is electrically connected to the output end of the operational amplifier OP1, and the other end of the first resistor R1 is electrically connected to one end of the second resistor R2. The other end of the second resistor R2 is grounded.
The sampling unit 221a further includes a conversion circuit. The conversion circuit is configured to convert the signal sampled by the sampling unit 221a into an analog sampling signal. In the embodiment of the present application, the conversion circuit is electrically connected to the output end of the conditioning circuit, and is configured to convert the signal output by the conditioning circuit into an analog signal and output the analog signal to the filtering module 231a. In the embodiment of the application, the conversion circuit includes a third resistor R3, a fourth resistor R4, a first capacitor C1 and a second capacitor C2.
One end of the third resistor R3 is electrically connected between the first resistor R1 and the second resistor R2, and the other end is electrically connected to one end of the first capacitor C1. The other end of the first capacitor C1 is grounded. One end of the fourth resistor R4 is electrically connected between the third resistor R3 and the first capacitor C1, and the other end is electrically connected to one end of the second capacitor C2. The other end of the second capacitor C2 is grounded. The third resistor R3, the first capacitor C1, the fourth resistor R4, and the second capacitor C2 form a second-order RC integrating circuit, and the second-order RC integrating circuit is configured to convert the digital signal output by the conditioning circuit into an analog signal and output the analog signal to the filtering module 231a.
It will be appreciated that the application is not limited to the specific circuit configuration of the conversion circuit. For example, in other embodiments, the conversion circuit may also be an LC filter circuit.
It will be appreciated that the present application also does not limit the location of the conversion circuit in the sampling unit 221 a. For example, in other embodiments, the conversion circuit may be electrically connected between the intelligent power amplifier module 21 and the voltage follower circuit; or the conversion circuit may also be electrically connected between the voltage follower circuit and the conditioning circuit.
The input terminal of the sampling unit 222a is electrically connected to the second output terminal OUT2 of the intelligent power amplifier module 21. Specifically, the non-inverting input terminal of the operational amplifier OP1 in the sampling unit 222a is electrically connected to the second output terminal OUT2 of the intelligent power amplifier module 21 to collect and amplify the signal power of the PWM signal output by the second output terminal OUT2. It is understood that the circuit structure and the working principle of the sampling unit 222a are the same as those of the sampling unit 221a, and will not be described herein. And the resistance or capacitance of the electronic components corresponding to the sampling unit 222a and the sampling unit 221a are equal, so that the sampling module 22a finally outputs differential signals with the same amplitude and opposite phases.
The two input ends of the filtering module 231a are respectively electrically connected between the fourth resistor R4 and the second capacitor C2 of the two sampling units (for example, the sampling unit 221a and the sampling unit 222 a), and are respectively configured to receive the two sampling signals output by the sampling module 22a and respectively perform filtering.
The analog audio signals output by the filtering modules 23 at least comprise any two of a low-frequency signal, an intermediate-frequency signal and a high-frequency signal. In the embodiment of the present application, the filtering modules 23 include a filtering module 231a and a filtering module 232a. The filter module 231a includes a filter capacitor C5, a filter resistor R9, a filter capacitor C6, and a filter resistor R10. One end of the filter capacitor C5 is electrically connected between the fourth resistor R4 and the second capacitor C2, and the other end is electrically connected to one end of the filter resistor R9. The other end of the filter resistor R9 is electrically connected to the analog power amplifier module 24. One end of the filter capacitor C6 is electrically connected between the fourth resistor R4 and the second capacitor C2 of the sampling unit 222a, the other end of the filter capacitor C6 is electrically connected to one end of the filter resistor R10, and the other end of the filter resistor R10 is electrically connected to the analog power amplifier module 24.
It can be understood that the filter capacitor C5 and the filter resistor R9 connected in series form a filter module for filtering out signals of a partial frequency band of the sampling unit 221 a. The filter capacitor C6 and the filter resistor R10 connected in series form a filter module for filtering out signals of a partial frequency band of the sampling unit 222 a. Further, the filtering module 231a outputs the filtered differential signal to the analog power amplifier module 24. In this way, the analog power amplifier module 24 amplifies the signal power of the received differential signal to output to the second speaker, such as the speaker 252, to drive the speaker 252 to play sound.
The circuit structure of the filtering module 232a is substantially the same as that of the filtering module 231a, that is, the filtering module 232a also includes a filtering capacitor C7, a filtering resistor R11, a filtering capacitor C8 and a filtering resistor R12. And the filter capacitor C7, the filter resistor R11, the filter capacitor C8 and the filter resistor R12 are electrically connected to the filter capacitor C5, the filter resistor R9, the filter capacitor C6 and the filter resistor R10 in the filter module 231a in the same manner. The difference is that the filtering resistance and the filtering capacitance of the filtering module 231a are different from those of the filtering module 232a, so that the cut-off frequencies of the filtering module 231a and the filtering module 232a are different, and the filtered frequency bands are also different. For example, in some embodiments, the filtering module 231a is configured to filter out signals in low frequency and high frequency bands in the analog sampled signal output by the sampling module 22a, so that the speaker 252 plays the sound signal in the intermediate frequency band; the filtering module 232a is configured to filter signals in the low frequency band and the intermediate frequency band of the analog sampled signals output by the sampling module 22a, so that the other second speaker, for example, the speaker 253 plays the sound signal in the high frequency band. The speaker 251 is electrically connected to the intelligent power amplifier module 21, and is used for playing the low-frequency band sound signal. Thus, by setting a plurality of different filtering modules, the speaker driving circuit 100a provided by the application realizes that a plurality of speakers are driven to play signals of a plurality of frequency bands simultaneously, and effectively improves the stereo effect of the electronic device 200.
In the embodiment of the application, the low-frequency band signal can be a signal in the interval of 40Hz-80 Hz; the intermediate frequency band signal can be a signal in the interval 160Hz-1280 Hz; the high frequency band signal may be a signal in the interval 2560Hz-5120 Hz. It is understood that in other embodiments, the signals of the low frequency band, the intermediate frequency band and the high frequency band may have other divisions, and the application is not limited to the divisions of the low frequency band, the intermediate frequency band and the high frequency band.
It is understood that the present application is not limited to the resistance or capacitance of the electronic components in the speaker driving circuit 100, and those skilled in the art can set the corresponding resistance or the accommodated electronic components according to actual needs.
With continued reference to fig. 5, the speaker driving circuit 100a further includes an electromagnetic interference (Electromagnetic Interference, EMI) suppression circuit 26 for suppressing electromagnetic interference of the speaker 251. In the embodiment of the present application, the EMI suppression circuit 26 includes a filter resistor R13, a filter resistor R14, a filter capacitor C9, and a filter capacitor C10. One end of the filter resistor R13 is electrically connected to the first output terminal OUT1 of the intelligent power amplifier module 21, and the other end is electrically connected between the filter capacitor C9 and the first input terminal of the speaker 251. The other end of the filter capacitor C9 is grounded. One end of the filter resistor R14 is connected to the second output terminal OUT2 of the intelligent power amplifier module 21, and the other end is electrically connected between the filter capacitor C10 and the second input terminal of the speaker 251. The other end of the filter capacitor C10 is grounded. Thus, the filter resistor R13 and the filter capacitor C9 together form a filter module, and the filter resistor R14 and the filter capacitor C10 together form another filter module to filter out the high-frequency currents at the two output ends of the intelligent power amplifier module 21, so as to inhibit electromagnetic interference of the speaker 251.
It should be understood that the filtering modules 231a/232a and the EMI suppression circuit 26 in the embodiments of the present application are not limited to the circuit structures described in the embodiments of the present application. In other embodiments, the filtering modules 231a/232a and the EMI suppression circuit 26 can be other circuit structures or electronic devices with filtering or electromagnetic interference suppression functions.
It will be appreciated that fig. 5 only describes the operation of the speaker driving circuit 100 with the speaker driving circuit 100 including 1 set of driving circuits 20. In other embodiments, speaker driver circuit 100a may also include sets of driver circuits 20 to drive more speakers, thereby providing a user with better audio playback quality.
Referring to fig. 6, another embodiment of the present application further provides a speaker driving circuit 100b. The speaker driving circuit 100b has substantially the same circuit configuration as the speaker driving circuit 100a, except that the sampling module 22b of the speaker driving circuit 100b is different from the sampling module 22a in the speaker driving circuit 100 a.
In the embodiment of the present application, the sampling module 22b includes a sampling unit 221b and a sampling unit 222b. The sampling units 221b and 222b are electrically connected to the first output terminal OUT1 and the second output terminal OUT2 of the intelligent power amplifier module 21, respectively, so as to convert the PWM signals output by the intelligent power amplifier module 21 into analog signals, respectively, and perform power amplification processing.
The sampling unit 221b includes an integrating resistor R5, an integrating resistor R6, an integrating capacitor C1, an integrating capacitor C2, an operational amplifier OP1, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. One end of the integrating resistor R5 is connected to the first output terminal OUT1 of the intelligent power amplifier module 21, and the other end is electrically connected to one end of the integrating capacitor C1. The other end of the integrating capacitor C1 is grounded. One end of the integrating resistor R6 is electrically connected between the integrating resistor R5 and the integrating capacitor C1, and the other end of the integrating resistor R6 is electrically connected to one end of the integrating capacitor C2. The other end of the integrating capacitor C2 is grounded. The first resistor R1 is electrically connected between the integrating resistor R6 and the integrating capacitor C2, and the other end of the first resistor R1 is electrically connected to the non-inverting input terminal of the operational amplifier OP 1. One end of the second resistor R2 is electrically connected between the first resistor R1 and the non-inverting input terminal of the operational amplifier OP1, and the other end is grounded. One end of the third resistor R3 is electrically connected to the inverting input end of the operational amplifier OP1, and the other end of the third resistor R is grounded. One end of the fourth resistor R4 is electrically connected to the inverting input terminal of the operational amplifier OP1, and the other end is electrically connected to the output terminal of the operational amplifier OP 1. The output terminal of the operational amplifier OP1 is also electrically connected to the filtering module 231a.
It can be understood that the integrating resistor R5, the integrating resistor R6, the integrating capacitor C1 and the integrating capacitor C2 form a second-order RC integrated conversion circuit, which is configured to convert the PWM signal output by the first output terminal OUT1 of the intelligent power amplifier module 21 into an analog signal and output the analog signal to the operational amplifier OP1.
The operational amplifier OP1, the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 together form an in-phase proportional amplifying circuit, wherein the output analog sampling signal meets the voltage requirement of the input end of the analog power amplifying module 24 through the voltage division action of the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4.
In the embodiment of the present application, the sampling unit 222b is configured to convert the PWM signal output by the second output terminal OUT2 of the intelligent power amplifier module 21 into an analog signal, and perform a process similar to that of the sampling unit 221b.
Referring to fig. 7, another embodiment of the present application further provides a speaker driving circuit 100c. The speaker driving circuit 100c has substantially the same circuit configuration as the speaker driving circuit 100b, except that the sampling module 22c of the speaker driving circuit 100c is different from the sampling module 22b of the speaker driving circuit 100 b. In the embodiment of the application, the sampling module 22c also includes a sampling unit 221c and a sampling unit 222c. In the embodiment of the application, the sampling unit 221C also includes an integrating resistor R3, an integrating resistor R4, an integrating capacitor C1, an integrating capacitor C2, an operational amplifier OP1, a first resistor R1 and a second resistor R2. The difference between the sampling unit 221c and the sampling unit 221b is that the electrical connection relationship between the operational amplifier OP1, the first resistor R1, and the second resistor R2 in the sampling unit 221c is different from the electrical connection relationship between the operational amplifier OP1, the first resistor R1, and the second resistor R2 in the sampling unit 221b. That is, the sampling unit 221c of the embodiment of the present application also includes a conversion circuit forming a second-order RC integrating circuit, and the difference is that the operational amplifier OP1, the first resistor R1 and the second resistor R2 are electrically connected in a different relationship from the sampling unit 221b.
Specifically, referring to fig. 7, one end of the first resistor R1 is connected between the integrating resistor R2 and the integrating capacitor C2, and the other end is electrically connected to the inverting input terminal of the operational amplifier OP 1. One end of the second resistor R2 is electrically connected between the first resistor R1 and the inverting input terminal of the operational amplifier OP1, and the other end is electrically connected to the output terminal of the operational amplifier OP 1. The non-inverting input terminal of the operational amplifier OP1 is grounded. The output terminal of the operational amplifier OP1 is electrically connected to the filtering module 231a. It can be understood that, in the embodiment of the present application, the first resistor R1, the second resistor R2 and the operational amplifier OP1 together form an inverting proportional amplifying circuit, and the voltage dividing effect of the first electronic resistor R1 and the second resistor R2 makes the output analog sampling signal meet the voltage requirement of the input end of the analog power amplifier module 24.
It is understood that the circuit structure and the electrical connection relationship of the sampling unit 222c are the same as those of the sampling unit 221c, and will not be described herein.
Referring to fig. 8, another embodiment of the present application further provides a speaker driving circuit 100d. The speaker driving circuit 100d has substantially the same circuit configuration as the speaker driving circuit 100a, except that the sampling module 22d of the speaker driving circuit 100d is different from the sampling module 22a in the speaker driving circuit 100 a.
In the embodiment of the present application, the sampling module 22d includes a first resistor R1, a second resistor R2, an operational amplifier OP1, a filter resistor R5, a filter capacitor C1, a third resistor R3, a fourth resistor R4, a filter resistor R6, and a filter capacitor C2. One end of the feedback resistor R1 is electrically connected to the first output terminal OUT1 of the intelligent power amplifier module 21, and the other end is electrically connected to the inverting input terminal of the operational amplifier OP 1. One end of the second resistor R2 is electrically connected between the first resistor R1 and the inverting input terminal, and the other end is electrically connected to the first output terminal O1 of the operational amplifier. One end of the third resistor R3 is electrically connected to the second output terminal OUT2 of the intelligent power amplifier module 21, and the other end is electrically connected to the non-inverting input terminal of the operational amplifier OP 1. One end of the fourth resistor R4 is electrically connected between the third resistor R3 and the non-inverting input terminal, and the other end is electrically connected to the second output terminal O2 of the operational amplifier OP 1. In this way, the first resistor R1, the second resistor R2, the operational amplifier OP1, the third resistor R3, and the fourth resistor R4 together form a fully differential amplifying circuit. The two output ends of the operational amplifier OP1 are further divided by the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4, respectively, so that the output analog sampling signal meets the voltage requirement of the input end of the analog power amplifier module 24.
One end of the filter resistor R5 is electrically connected between the first output end O1 and the second resistor R2 of the operational amplifier OP1, and the other end is electrically connected to one end of the filter capacitor C1. The other end of the filter capacitor C1 is grounded. In this way, the filter resistor R5 and the filter capacitor C1 together form a conversion circuit for converting the PWM signal output from the first output terminal O1 of the operational amplifier OP1 into an analog sampling signal. One end of the filter resistor R6 is electrically connected between the second output end O2 of the operational amplifier OP1 and the fourth resistor R4, and the other end is electrically connected to one end of the filter capacitor C2. The other end of the filter capacitor C2 is grounded. In this way, the filter resistor R6 and the filter capacitor C2 together form a conversion circuit for converting the PWM signal output from the second output terminal O2 of the operational amplifier OP1 into an analog sampling signal.
The first input terminal of the filtering module 231a is electrically connected between the filtering resistor R5 and the filtering capacitor C1, and the second input terminal of the filtering module 231a is electrically connected between the filtering resistor R6 and the filtering capacitor C2, for receiving the analog sampling signal output by the sampling module 22 d.
Referring to fig. 9, another embodiment of the present application further provides a speaker driving circuit 100e. The speaker driving circuit 100e has substantially the same circuit configuration as the speaker driving circuit 100d, except that the sampling module 22e of the speaker driving circuit 100e is different from the sampling module 22d of the speaker driving circuit 100d, and the filter module 23e of the speaker driving circuit 100e is different from the filter module 23a of the speaker driving circuit 100 d.
In the embodiment of the present application, the sampling module 22e includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a filter resistor R5, a filter capacitor C1 and an operational amplifier OP1. One end of the first resistor R1 is electrically connected to the first output terminal OUT1 of the intelligent power amplifier module 21, and the other end is electrically connected to the inverting input terminal of the operational amplifier OP1. One end of the second resistor R2 is electrically connected to the second output terminal OUT2 of the intelligent power amplifier module 21, and the other end is electrically connected to the non-inverting input terminal of the operational amplifier OP1. One end of the third resistor R3 is electrically connected between the feedback resistor R1 and the inverting input terminal, and the other end is electrically connected to the output terminal of the operational amplifier OP1. One end of the fourth resistor R4 is electrically connected between the second resistor R2 and the non-inverting input end, and the other end is grounded. In this way, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4 and the operational amplifier OP1 together form a differential amplifying circuit, and the output analog sampling signal meets the voltage requirement of the input end of the analog power amplifying module 24.
One end of the filter resistor R5 is electrically connected between the operational amplifier OP1 and the feedback resistor R3, and the other end is grounded through the filter capacitor C1. In this way, the filter resistor R5 and the filter capacitor C1 together form a conversion circuit to convert the PWM signal output by the differential amplifying circuit into an analog sampling signal.
In the embodiment of the present application, the circuit structure of the filtering module 231e is substantially the same as that of the filtering module 231a, except that the filtering capacitor C5 is electrically connected between the filtering resistor R5 and the filtering capacitor C1, and is configured to receive and filter the differential sampling signal output by the sampling module 22 d. One end of the filter capacitor C6 is grounded and is used as a reference signal of the input end of the analog power amplifier module 24.
Referring to fig. 10, another embodiment of the present application further provides a speaker driving circuit 100f. The speaker driving circuit 100f has substantially the same circuit configuration as the speaker driving circuit 100e, except that the sampling module 22f of the speaker driving circuit 100f is different from the sampling module 22e of the speaker driving circuit 100 e.
In the embodiment of the present application, the sampling module 22f includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a first operational amplifier OP1, a second operational amplifier OP2, and a third operational amplifier OP3. The non-inverting input terminal of the first operational amplifier OP1 is electrically connected to an output terminal of the intelligent power amplifier module 21. The inverting input terminal of the first operational amplifier OP1 is electrically connected to one terminal of the first resistor R1. The other end of the first resistor R1 is electrically connected to the output terminal of the first operational amplifier OP 1. The non-inverting input terminal of the second operational amplifier OP2 is electrically connected to the other output terminal of the intelligent power amplifier module 21. The inverting input terminal of the second operational amplifier OP2 is electrically connected to one terminal of the third resistor R3. The other end of the third resistor R3 is electrically connected to the output terminal of the second operational amplifier OP 2. One end of the second resistor R2 is electrically connected between the inverting input terminal of the first operational amplifier OP1 and the first resistor R1. The other end of the second resistor R2 is electrically connected between the inverting input terminal of the second operational amplifier OP2 and the third resistor R3. One end of the fourth resistor R4 is electrically connected between the first resistor R1 and the output end of the first operational amplifier OP 1. The other end of the fourth resistor R4 is electrically connected to the inverting input terminal of the third operational amplifier OP3. One end of the fifth resistor R5 is electrically connected between the third resistor R3 and the output terminal of the second operational amplifier OP 2. The other end of the fifth resistor R5 is electrically connected to the non-inverting input terminal of the third operational amplifier OP3. One end of the sixth resistor R6 is electrically connected between the fourth resistor R4 and the inverting input terminal of the third operational amplifier OP3. The other end of the sixth resistor R6 is electrically connected to the output terminal of the third operational amplifier OP3. One end of the seventh resistor R7 is electrically connected between the fifth resistor R5 and the non-inverting input terminal of the third operational amplifier OP3. The other end of the seventh resistor R7 is grounded. It can be understood that the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, the first operational amplifier OP1, the second operational amplifier OP2 and the third operational amplifier OP3 together form an instrumentation amplifier circuit, and the output analog sampling signal meets the voltage requirement of the input end of the analog power amplifier module 24.
In an embodiment of the present application, the sampling module 22f further includes a conversion circuit. In the embodiment of the application, the conversion circuit includes a filter resistor R8 and a filter capacitor C1. One end of the filter resistor R8 is electrically connected between the feedback resistor R3 and the output end of the third operational amplifier OP3, and the other end of the filter resistor R8 is electrically connected to one end of the filter capacitor C1. The other end of the filter capacitor C1 is grounded. In this way, the conversion circuit is used to convert the signal output from the instrumentation amplifier circuit into an analog sampling signal.
The filter capacitor C5 of the filter module 231e is electrically connected between the filter resistor R8 and the filter capacitor C1, and is configured to receive and filter the analog sampling signal output by the sampling module 22 f. One end of the filter capacitor C6 is grounded and is used as a reference signal of the input end of the analog power amplifier module 24.
It is understood that in some embodiments, at least two of the sampling modules mentioned in the above embodiments, such as the sampling module 22a, the sampling module 22b, the sampling module 22c, the sampling module 22d, the sampling module 22e, and the sampling module 22f, may be implemented in the same speaker driving circuit 100.
Obviously, the speaker driving circuit 100 (100 a/100b/100c/100d/100e/100 f) provided by the application processes the signal output by the intelligent power amplifier module 21 through the sampling module 22 (22 a/22b/22c/22d/22e/22 f) and outputs the signal to the filtering module 23 and the analog power amplifier module 24, so as to drive the corresponding speaker to play sound. The sampling module 22 can reduce signal distortion phenomenon and improve signal to noise ratio; on the other hand, the voltage output from the intelligent power amplifier module 21 to the analog power amplifier module 24 can be adjusted to meet the requirement of the input voltage of the analog power amplifier module 24. In summary, compared with the existing speaker driving circuit, the speaker driving circuit provided by the application has better driving effect, simple circuit structure and lower cost.
The above embodiments are only for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present application.

Claims (15)

1. The loudspeaker driving circuit is characterized by comprising a control chip and a plurality of groups of driving circuits electrically connected with the control chip, wherein each group of driving circuits comprises an intelligent power amplifier module, a sampling module, a plurality of filtering modules and a plurality of analog power amplifier modules;
one end of the intelligent power amplification module is electrically connected to the control chip, the other end of the intelligent power amplification module is electrically connected to the first loudspeaker, the sampling module is electrically connected to the intelligent power amplification module and a plurality of filtering modules, the plurality of filtering modules are in one-to-one correspondence connection with a plurality of analog power amplification modules, and the plurality of analog power amplification modules are respectively in one-to-one correspondence connection with a plurality of second loudspeakers;
the intelligent power amplifier module is used for processing the initial audio signal output by the control chip so as to output a first target audio signal to the first loudspeaker;
The sampling module is composed of a differential amplifying circuit and a converting circuit, the differential amplifying circuit is electrically connected with two output ends of the intelligent power amplifying module and the converting circuit, and the converting circuit is electrically connected with a plurality of filtering modules;
the differential amplifying circuit is used for sampling the first target audio signals output by the two output ends of the intelligent power amplifying module and adjusting the voltage of the first target audio signals, and the converting circuit is used for converting the signals output by the differential amplifying circuit into analog signals and outputting the analog signals to the filtering modules;
the filtering module is used for filtering the analog signal to output an analog audio signal to the analog power amplifier module; the analog power amplification module is used for amplifying the power of the analog audio signal and outputting a second target audio signal to the second loudspeaker so as to drive the second loudspeaker to play sound.
2. The speaker driver circuit of claim 1, wherein the differential amplifier circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, and an operational amplifier, wherein one end of the first resistor is electrically connected to an output terminal of the intelligent power amplifier module, the other end of the first resistor is electrically connected to an inverting input terminal of the operational amplifier module, one end of the second resistor is electrically connected to another output terminal of the intelligent power amplifier module, the other end of the second resistor is electrically connected to an inverting input terminal of the operational amplifier module, one end of the third resistor is electrically connected between the first resistor and the inverting input terminal, the other end of the third resistor is electrically connected to an output terminal of the operational amplifier, one end of the fourth resistor is electrically connected between the second resistor and the inverting input terminal of the operational amplifier module, and the other end of the fourth resistor is grounded.
3. The loudspeaker drive circuit according to claim 1, wherein the sampling module is composed of a fully differential amplifying circuit and two converting circuits, the fully differential amplifying circuit is electrically connected with two output ends of the intelligent power amplifying module and the two converting circuits, and the converting circuits are electrically connected with the filtering module;
the full-differential amplifying circuit is used for sampling the first target audio signals output by the two output ends of the intelligent power amplifying module and adjusting the voltage of the first target audio signals, and the converting circuit is used for converting the signals output by the full-differential amplifying circuit into analog signals and outputting the analog signals to the filtering module.
4. The speaker driver circuit of claim 3, wherein the fully differential amplifier circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, and an operational amplifier, wherein one end of the first resistor is electrically connected to an output terminal of the intelligent power amplifier module, the other end of the first resistor is electrically connected to an inverting input terminal of the operational amplifier module, one end of the second resistor is electrically connected between the first resistor and the inverting input terminal, the other end of the second resistor is electrically connected to a first output terminal of the operational amplifier module, one end of the third resistor is electrically connected to another output terminal of the intelligent power amplifier module, the other end of the third resistor is electrically connected to a non-inverting input terminal of the operational amplifier module, one end of the fourth resistor is electrically connected between the third resistor and the non-inverting input terminal, and the other end of the fourth resistor is electrically connected to a second output terminal of the operational amplifier.
5. The loudspeaker drive circuit according to claim 1, wherein the sampling module is composed of an instrumentation amplifier circuit and a conversion circuit, the instrumentation amplifier circuit is electrically connected with two output ends of the intelligent power amplifier module and the conversion circuit, and the conversion circuit is electrically connected with a plurality of filter modules;
the instrument amplifier circuit is used for sampling the first target audio signals output by the two output ends of the intelligent power amplifier module and adjusting the voltage of the first target audio signals, and the conversion circuit is used for converting the signals output by the instrument amplifier circuit into analog signals and outputting the analog signals to the plurality of filtering modules.
6. The speaker driver circuit as claimed in claim 5, wherein the instrumentation amplifier circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first operational amplifier, a second operational amplifier, and a third operational amplifier, the non-inverting input terminal of the first operational amplifier is electrically connected to the first output terminal of the smart power amplifier module, the inverting input terminal of the first operational amplifier is electrically connected to one end of the first resistor, the other end of the first resistor is electrically connected to the output terminal of the first operational amplifier, the non-inverting input terminal of the second operational amplifier is electrically connected to the other output terminal of the smart power amplifier module, the inverting input terminal of the second operational amplifier is electrically connected to one end of the third resistor, the other end of the third resistor is electrically connected to the output terminal of the second operational amplifier, one end of the second resistor is electrically connected to the first output terminal of the smart power amplifier, the non-inverting input terminal of the first operational amplifier is electrically connected to the other end of the first operational amplifier, the non-inverting input terminal of the second operational amplifier is electrically connected to the other end of the third resistor is electrically connected to the non-inverting input terminal of the third operational amplifier, the non-inverting input terminal of the third operational amplifier is electrically connected to the other end of the third resistor is electrically connected to the other end of the inverting input terminal of the third operational amplifier is electrically connected to the non-inverting input terminal of the third resistor, the other end of the sixth resistor is electrically connected to the output end of the third operational amplifier, one end of the seventh resistor is electrically connected between the fifth resistor and the non-inverting input end of the third operational amplifier, and the other end of the seventh resistor is grounded.
7. The loudspeaker drive circuit according to claim 1, wherein the sampling module is composed of two sampling units, and the two sampling units are respectively and electrically connected with two output ends of the intelligent power amplifier module;
the sampling unit is composed of a voltage follower circuit, a conditioning circuit and a conversion circuit, wherein the voltage follower circuit is electrically connected with an output end of the intelligent power amplifier module and the conditioning circuit, and the conversion circuit is electrically connected with the conditioning circuit and the filtering module;
the voltage follower circuit is used for sampling the first target audio signal, the conditioning circuit is used for adjusting the voltage of the signal output by the voltage follower circuit, and the conversion circuit is used for converting the signal output by the conditioning circuit into an analog signal and outputting the analog signal to the filtering module.
8. The speaker driver circuit of claim 7, wherein the voltage follower circuit comprises an operational amplifier for effecting sampling of the first target audio signal and adjusting a current ratio between the intelligent power amplifier module output to the first speaker and the analog power amplifier module.
9. The loudspeaker driving circuit according to claim 8, wherein the non-inverting input of the operational amplifier is electrically connected to the output of the intelligent power amplifier module, and the inverting input of the operational amplifier is electrically connected to the output of the operational amplifier.
10. The loudspeaker drive circuit according to claim 7, wherein the sampling unit is composed of a conversion circuit and an in-phase proportional amplification circuit, the conversion circuit is electrically connected with an output end of the intelligent power amplification module and the in-phase proportional amplification circuit, and the in-phase proportional amplification circuit is electrically connected with the filter module;
the conversion circuit is used for converting the first target audio signal into an analog signal, and the in-phase proportional amplification circuit is used for sampling the analog signal output by the conversion circuit and adjusting the voltage of the analog signal.
11. The speaker driver circuit of claim 10, wherein the in-phase proportional amplification circuit comprises an operational amplifier, a first resistor, a second resistor, a third resistor, and a fourth resistor, the first resistor is electrically connected to the switching circuit, the other end of the first resistor is electrically connected to the in-phase input terminal of the operational amplifier, one end of the second resistor is electrically connected between the first resistor and the in-phase input terminal of the operational amplifier, the other end of the second resistor is grounded, one end of the third resistor is electrically connected to the inverting input terminal of the operational amplifier, the other end of the third resistor is grounded, one end of the fourth resistor is electrically connected to the inverting input terminal of the operational amplifier, and the other end of the fourth resistor is electrically connected to the output terminal of the operational amplifier.
12. The loudspeaker drive circuit according to claim 7, wherein the sampling unit is composed of a conversion circuit and an inverting proportional amplifying circuit, the conversion circuit is electrically connected with an output end of the intelligent power amplifying module and the inverting proportional amplifying circuit, and the inverting proportional amplifying circuit is electrically connected with the filtering module;
the conversion circuit is used for converting the first target audio signal into an analog signal, and the inverting proportional amplification circuit is used for sampling the analog signal output by the conversion circuit and adjusting the voltage of the analog signal.
13. The speaker driver circuit of claim 12, wherein the inverting proportional amplifying circuit comprises an operational amplifier, a first resistor and a second resistor, wherein one end of the first resistor is correspondingly and electrically connected to the switching circuit, the other end of the first resistor is electrically connected to the inverting input terminal of the operational amplifier, the non-inverting input terminal of the operational amplifier is grounded, one end of the second resistor is electrically connected between the first resistor and the inverting input terminal of the operational amplifier, and the other end of the second resistor is electrically connected to the output terminal of the operational amplifier.
14. The speaker driving circuit as claimed in claim 1, wherein the analog audio signals output by the plurality of filtering modules include at least any two of a low frequency signal, an intermediate frequency signal, and a high frequency signal.
15. An electronic device comprising a speaker driving circuit as claimed in any one of claims 1 to 14.
CN202210515695.1A 2022-05-11 2022-05-11 Speaker driving circuit and electronic device Active CN116055950B (en)

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