Driving circuit and method and electronic equipment

Abstract

The invention relates to the technical field of audio driving, in particular to a driving circuit and method and electronic equipment. The method comprises the following steps: arranging two boosting units at the output end of the power amplifier, respectively receiving two paths of signals with opposite phases output by the power amplifier so as to realize that boosted signals output by the two boosting units are also signals with opposite phases, arranging one boosting unit to be connected with the positive electrode of the piezoelectric ceramic module, and arranging the other boosting unit to be connected with the negative electrode of the piezoelectric ceramic module; and the other boosting unit is connected with the negative electrode of the piezoelectric ceramic module, so that the driving voltage of the piezoelectric ceramic module is increased. The boost unit is simple in structure, occupies a small area of a circuit board, and can be effectively applied to miniaturized electronic equipment.

Description

Technical Field

[0001] This application relates to the field of audio driver technology, and in particular to a driver circuit, method and electronic device. Background Technology

[0002] As electronic devices become more functional, the number of audio components within them is also gradually increasing. These components can include traditional speakers and piezoelectric ceramics. Speakers are used for voice communication and music playback, while piezoelectric ceramics, due to their high-frequency signal emission and underwater sound capabilities, are generally used for alarm audio playback and underwater communication.

[0003] Piezoelectric ceramics require significantly higher driving voltages than traditional loudspeakers. Therefore, the conventional driving voltages of electronic devices are generally insufficient to drive piezoelectric ceramics. For example, some electronic devices use a conventional driving voltage of 10V, while piezoelectric ceramics require 60V. In some embodiments, a voltage boosting effect is achieved by adding an H-bridge and transformer driving circuit to the electronic device, thereby enabling the driving of the piezoelectric ceramic. However, the complex layout and large circuit board area of ​​H-bridges and transformer driving circuits make them difficult to apply to miniaturized electronic devices (e.g.,...). Figure 1 (as shown in the smartwatch). Summary of the Invention

[0004] To address the problem that the complex layout and large circuit board area of ​​the H-bridge and transformer drive circuits make them difficult to apply to miniaturized electronic devices, this application provides a drive circuit, method, and electronic device.

[0005] In a first aspect, this application provides a driving circuit, including a power amplifier module, a boost module and a first audio device, wherein the boost module includes a first boost unit and a second boost unit;

[0006] The power amplifier module is used to output a first audio signal to a first boost unit and to output a second audio signal to a second boost unit, wherein the first audio signal and the second audio signal are out of phase;

[0007] The first boost unit is used to amplify the voltage of the first audio signal, obtain the third audio signal, and send the third audio signal to the positive terminal of the first audio device. The second boost unit is used to amplify the voltage of the second audio signal, obtain the fourth audio signal, and send the fourth audio signal to the negative terminal of the first audio device.

[0008] Based on the scheme of the present application, double driving voltage can be obtained to meet the driving voltage of the piezoelectric ceramic module. For example, when one of the voltage boosting units (e.g., the first voltage boosting unit) outputs a signal of +30v and the other voltage boosting unit (e.g., the second voltage boosting unit) outputs a signal of -30v, the voltage on the piezoelectric ceramic module is the difference between +30v and -30v, i.e., 60v. It can be understood that the voltage boosting unit has a simple structure and occupies a small area of the circuit board, and can be effectively applied to small electronic devices.

[0009] In a possible implementation of the first aspect, the first audio device is a piezoelectric ceramic module.

[0010] In a possible implementation of the first aspect, the power amplifier module includes a first power amplifier, a first filter, and a second filter, and the power amplifier is connected with the first filter and the second filter; the first power amplifier is configured to output a fifth audio signal to the first filter and output a sixth audio signal to the second filter, where the fifth audio signal and the sixth audio signal are opposite in phase; the first filter is configured to filter the fifth audio signal to obtain the first audio signal; and the second filter is configured to filter the sixth audio signal to obtain the second audio signal.

[0011] It can be understood that, in the embodiments of the present application, if the fifth audio signal and the sixth audio signal are opposite in phase, the first audio signal and the second audio signal are also opposite in phase. The first filter can be a first band-pass filter, and the second filter can be a second band-pass filter.

[0012] In a possible implementation of the first aspect, the first voltage boosting unit includes a first operational amplifier, and the second voltage boosting unit includes a second operational amplifier; a first end of the first operational amplifier is connected with the first filter, and a second end of the first operational amplifier is connected with a positive electrode of the piezoelectric ceramic module; a first end of the second operational amplifier is connected with the second filter, and a second end of the second operational amplifier is connected with a negative electrode of the piezoelectric ceramic module.

[0013] In a possible implementation of the first aspect, the first voltage boosting unit further includes a first matching unit, and the second voltage boosting unit further includes a second matching unit; the second end of the first operational amplifier is connected with the positive electrode of the piezoelectric ceramic module, including that the second end of the first operational amplifier is connected with a first end of the first matching unit, and a second end of the first matching unit is connected with the positive electrode of the piezoelectric ceramic module; and the second end of the second operational amplifier is connected with the negative electrode of the piezoelectric ceramic module, including that the second end of the second operational amplifier is connected with a first end of the second matching unit, and a second end of the second matching unit is connected with the negative electrode of the piezoelectric ceramic module.

[0014] In a possible implementation of the first aspect, the voltage boosting module further includes a voltage amplification unit, a first end of the voltage amplification unit is connected with the first operational amplifier, and a second end of the voltage amplification unit is connected with the second operational amplifier; the voltage amplification unit is configured to amplify the first voltage of the power supply to obtain a second voltage; the first operational amplifier is configured to send the third audio signal to the positive electrode of the piezoceramic module at the second voltage; and the second operational amplifier is configured to send the fourth audio signal to the negative electrode of the piezoceramic module at the second voltage.

[0015] It can be understood that, in the embodiments of the present application, the first operational amplifier is configured to send the signal output by the first filter to the positive electrode of the piezoceramic module at the second voltage, that is, to send the third audio signal with the second voltage to the positive electrode of the piezoceramic module; and the second operational amplifier is configured to send the signal output by the second filter to the negative electrode of the piezoceramic module at the second voltage, that is, to send the fourth audio signal with the second voltage to the negative electrode of the piezoceramic module. It can be understood that, since the signal output by the first filter and the signal output by the second filter are signals with opposite phases, the signals output by the first operational amplifier and the second operational amplifier are signals with opposite polarities after voltage boosting.

[0016] In a possible implementation of the first aspect, the device further includes a switching module and a second audio device, and the switching module is configured to control the communication and disconnection of the first power amplifier with the second audio device, and to control the communication and disconnection of the first power amplifier with the piezoceramic module.

[0017] In a possible implementation of the first aspect, the switching module includes a first switching unit and a second switching unit; a first end of the first switching unit is connected with the first power amplifier, a second end of the first switching unit is connected with the first filter, and a third end of the first switching unit is connected with the positive electrode of the second audio device; a first end of the second switching unit is connected with the first power amplifier, a second end of the second switching unit is connected with the second filter, and a second end of the second switching unit is connected with the negative electrode of the second audio device.

[0018] In the embodiments of the present application, the switching module can be used to play audio through different audio devices in different scenarios. For example, when music needs to be played, the first power amplifier is controlled to be in communication with the loudspeaker module, and the first power amplifier is controlled to be disconnected with the piezoceramic module; when an alarm sound needs to be played, the first power amplifier is controlled to be in communication with the piezoceramic module, and the first power amplifier is controlled to be disconnected with the loudspeaker module.

[0019] In a possible implementation of the first aspect, the device further includes a second audio device, and the power amplifier module further includes a second power amplifier, the second power amplifier being connected with the second audio device; and the second power amplifier is configured to output a seventh audio signal to the second audio device.

[0020] In some embodiments, a plurality of power amplifiers can be provided to drive different audio devices.

[0021] In a possible implementation of the first aspect, the power amplifier module comprises a multi-channel power amplifier; a first channel of the multi-channel power amplifier is connected to the first audio device; and a second channel of the multi-channel power amplifier is connected to the second audio device.

[0022] In a possible implementation of the first aspect, the second audio device is a loudspeaker module.

[0023] In a possible implementation of the first aspect, the power amplifier module further comprises a controller and a digital signal processor; the digital signal processor is configured to output an eighth audio signal to the digital signal processor; the digital signal processor is configured to perform digital processing on the eighth audio signal to obtain a ninth audio signal, and output the ninth audio signal to the power amplifier module.

[0024] In a second aspect, the present application provides a driving method for an electronic device, the electronic device comprising the driving circuit mentioned in the present application, the method comprising: determining that the first audio device needs to be driven to play target audio; controlling the power amplifier module to output a first audio signal corresponding to the target audio to the first voltage boosting unit, and output a second audio signal corresponding to the target audio to the second voltage boosting unit, wherein the first audio signal and the second audio signal are opposite in phase; controlling the first voltage boosting unit to perform voltage amplification processing on the first audio signal to obtain a third audio signal, and send the third audio signal to the positive electrode of the first audio device; and controlling the second voltage boosting unit to perform voltage amplification processing on the second audio signal to obtain a fourth audio signal, and send the fourth audio signal to the negative electrode of the first audio device.

[0025] In a possible implementation of the second aspect, the determining that the first audio device needs to be driven to play target audio comprises:

[0026] detecting an incoming call; obtaining an ambient noise value of the electronic device; and determining that the first audio device and the second audio device need to be driven to play incoming call audio, in response to the ambient noise value being greater than a first threshold value and the noise duration being greater than a first time length.

[0027] It can be understood that the loudspeaker module and the piezoelectric ceramic module work simultaneously, and the piezoelectric ceramic module serves as an extension of high frequency, which can improve the loudness of the downlink of the call, i.e., improve the intelligibility of the call, and further improve the user experience.

[0028] In a possible implementation of the second aspect, the method further includes: determining that the second audio device needs to be driven to play the incoming call audio corresponding to the environmental noise value being less than or equal to the first threshold; and determining that the second audio device needs to be driven to play the incoming call audio corresponding to the environmental noise value being greater than the first threshold and the noise duration being less than or equal to the first time length.

[0029] In a third aspect, the present application provides an electronic device, including the driving circuit mentioned in the present application.

[0030] In a fourth aspect, the present application provides an electronic device, including a memory for storing instructions executed by one or more processors of the electronic device, and a processor, which is one of the processors of the electronic device, for executing the driving method mentioned in the present application. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 According to some embodiments of the present application, a schematic diagram of a smart watch is shown;

[0032] Figure 2 According to some embodiments of the present application, a schematic diagram of a loudspeaker driving circuit structure is shown;

[0033] Figure 3 According to some embodiments of the present application, a schematic diagram of a first driving circuit structure is shown;

[0034] Figure 4 According to some embodiments of the present application, a schematic diagram of a second driving circuit structure is shown;

[0035] Figure 5 According to some embodiments of the present application, a schematic diagram of a third driving circuit structure is shown;

[0036] Figure 6 According to some embodiments of the present application, a schematic diagram of a fourth driving circuit structure is shown;

[0037] Figure 7 According to some embodiments of the present application, a schematic diagram of a fifth driving circuit structure is shown;

[0038] Figure 8 According to some embodiments of the present application, a measured effect of the driving circuit on a product is shown;

[0039] Figure 9 According to some embodiments of the present application, a flowchart of a driving method is shown;

[0040] Figure 10 According to some embodiments of the present application, a schematic diagram of an electronic device is shown. DETAILED DESCRIPTION

[0041] The illustrative embodiments of the present application include, but are not limited to, a driving circuit, a method and an electronic device.

[0042] It should be noted that the present application does not limit the specific form of the electronic device, which can be a mobile phone, a notebook computer, a tablet, a large-screen device, a wearable device (for example, a smart watch, smart glasses, a helmet), a desktop computer, an augmented reality (AR) / virtual reality (VR) device, a personal digital assistant (PDA) and the like, without limitation.

[0043] In order to more clearly understand the present application, first, the driving principle of the loudspeaker driving circuit structure shown in Figure 2 is introduced.

[0044] As shown in Figure 2 , the loudspeaker driving circuit structure can include a microcontroller unit (MCU), a digital signal processor (DSP), a power amplifier (referred to as a power amplifier) and a loudspeaker module. When the loudspeaker module needs to play audio, the MCU can send an audio signal M0 to the DSP, and the DSP performs digital processing on the audio signal, i.e., converts the audio signal M0 (a signal represented by a waveform) into a digital signal M1 composed of digital 0 and 1. Then, the processed digital signal M1 is sent to the power amplifier, and the power amplifier performs power amplification processing on the signal M1 to obtain a signal M2, and sends the signal M2 to the loudspeaker module. The loudspeaker module plays the corresponding audio based on the signal M2. It can be understood that the power amplifier generally uses differential signal technology to split the input signal into two signals with opposite phases, and then performs power amplification processing and output on the two signals with opposite phases to improve the fidelity of the power amplifier output audio signal.

[0045] It can be understood that, as before, for piezoelectric ceramic modules (or piezoelectric ceramics), the conventional driving voltage of the electronic device is difficult to reach the driving voltage of the piezoelectric ceramic module, for example, the maximum driving voltage that the smart watch can provide based on the current boost unit (such as a differential amplifier) is 30V, while the driving voltage of the piezoelectric ceramic module needs to be nearly 60V. In order to solve this problem, in some embodiments, a new H-bridge circuit and a transformer driving circuit are used to realize the driving of the piezoelectric ceramic module. However, the H-bridge circuit and the transformer driving circuit have complex layout and occupy a large area of the circuit board, which makes it difficult to be applied in small electronic devices (such as smart watches, etc.).

[0046] To address the aforementioned problems, this application provides a driving circuit. Based on the characteristic that the power amplifier outputs two signals with opposite phases in the aforementioned speaker module driving circuit, two boost units are set at the output terminal of the power amplifier to receive the two signals with opposite phases from the power amplifier, thereby ensuring that the boosted signals output by the two boost units are also signals with opposite phases. The opposite signal phases can be considered as the opposite polarity of the voltages carried by the signals. Furthermore, based on the fact that the voltage on an electronic device is the potential difference between the positive and negative terminals (i.e., the difference between the positive and negative voltages), one boost unit is connected to the positive terminal of the piezoelectric ceramic module, and the other boost unit is connected to the negative terminal of the piezoelectric ceramic module. In this way, the driving voltage on the piezoelectric ceramic module can be twice the output voltage of the boost units.

[0047] For example, as mentioned above, the maximum driving voltage that current boost units can provide is 30V. Based on the solution of this application, when one boost unit outputs a +30V signal and the other boost unit outputs a -30V signal, the voltage on the piezoelectric ceramic module is the difference between +30V and -30V, i.e., 60V. This satisfies the driving voltage requirement of the piezoelectric ceramic module. It can be understood that the boost unit has a simple structure, occupies a small circuit board area, and can be effectively applied in miniaturized electronic devices.

[0048] For example, Figure 3 A schematic diagram of a driving circuit is shown, such as... Figure 3 As shown, the driving circuit includes a power amplifier module, a boost module, and a first audio device. The boost module includes a first boost unit and a second boost unit. The first audio device is a piezoelectric ceramic module.

[0049] The power amplifier module is used to output a first audio signal to a first boost unit and to output a second audio signal to a second boost unit, wherein the first audio signal and the second audio signal are out of phase;

[0050] The first boost unit is used to amplify the voltage of the first audio signal, obtain the third audio signal, and send the third audio signal to the positive terminal of the first audio device. The second boost unit is used to amplify the voltage of the second audio signal, obtain the fourth audio signal, and send the fourth audio signal to the negative terminal of the first audio device.

[0051] The structure of the driving circuit provided in the embodiments of this application will be described in detail below.

[0052] Figure 4 and Figure 5 Schematic diagrams of one type of driving circuit are shown below, such as... Figure 4As shown, the driving circuit includes a processor, a DSP, a first power amplifier, a switching module, a filtering module, an operational amplifier module (i.e., the boost module mentioned in this application), a matching circuit module, a piezoelectric ceramic module, and a second audio device; wherein the power amplifier module and the filtering module may be components of the aforementioned power amplifier module, the second audio device may be a speaker module, and the processor may be an MCU.

[0053] like Figure 5 As shown, the first power amplifier can be a small power amplifier, which can further reduce the area occupied by the drive circuit.

[0054] The MCU can be used to send the signal corresponding to the audio to be played (e.g., signal MO, i.e., the eighth audio signal mentioned in this application) to the DSP for processing. The DSP is used to send the processed signal (e.g., signal M1, i.e., the ninth audio signal mentioned in this application) to the first power amplifier. The first power amplifier is used to amplify the signal M1 to generate a differential signal M2. The differential signal M2 may include a first signal (i.e., the fifth audio signal mentioned in this application) and a second signal (i.e., the sixth audio signal mentioned in this application). The first signal and the second signal are signals with opposite phases.

[0055] The switching module may include a first switching unit and a second switching unit. The first switching unit may include a first switch S1, and the second switching unit may include a second switch S2. The filtering module includes a first filter and a second filter. The first filter may be a first bandpass filter, and the second filter may be a second bandpass filter. The first switch S1 is used to control the switching off and on / off of the first power amplifier and the first bandpass filter, as well as the switching off and on / off of the first power amplifier and the positive terminal (SPK+) of the speaker module. The second switch S2 is used to control the switching off and on / off of the first power amplifier and the second bandpass filter, as well as the switching off and on / off of the first power amplifier and the negative terminal (SPK-) of the speaker module. For example, when it is necessary to drive the piezoelectric ceramic module but not the speaker module, the first and second switches can control the first power amplifier to be connected to the first bandpass filter and the second bandpass filter respectively. For example, when it is necessary to drive the speaker module but not the piezoelectric ceramic module, the first and second switches can control the first power amplifier to be disconnected from the first bandpass filter and the second bandpass filter respectively, and control the first power amplifier to be connected to the positive terminal (SPK+) and the negative terminal (SPK-) of the speaker module. The switching module enables audio playback through different audio devices in different scenarios. For example, when music needs to be played, the first power amplifier is connected to the speaker module and disconnected from the piezoelectric ceramic module; when an alarm sound needs to be played, the first power amplifier is connected to the piezoelectric ceramic module and disconnected from the speaker module.

[0056] The first bandpass filter is used to filter the first signal sent by the first power amplifier, and the second bandpass filter is used to filter the second signal sent by the first power amplifier, so as to obtain two signals (i.e., the first audio signal and the second audio signal mentioned in this application) that conform to the bandwidth range of the piezoelectric ceramic module drive signal. The two signals are signals with opposite phases. The filtering range of both the first bandpass filter and the second bandpass filter can be 5kHz-15kHz. This value is only illustrative and can be set according to actual needs. It is not limited here.

[0057] It is understandable that the bandwidth of the signal output by a power amplifier is generally a wide range (e.g., 20Hz-3MHz). Therefore, a filter needs to be set at the output of the power amplifier to screen the signal and obtain a signal that conforms to the bandwidth range of the piezoelectric ceramic module's driving signal (e.g., 5kHz-15kHz). It is also understandable that filtering the signal output by the first power amplifier using a first bandpass filter and a second bandpass filter can effectively filter out invalid signals, improve the signal-to-noise ratio, and achieve better results.

[0058] The operational amplifier module includes a first boost unit, a second boost unit, and a voltage amplification unit. The first terminal of the voltage amplification unit is connected to the first operational amplifier, and the second terminal of the voltage amplification unit is connected to the second operational amplifier. The first terminal of the first operational amplifier is connected to the first filter, and the second terminal of the first operational amplifier is connected to the positive terminal of the piezoelectric ceramic module. The first terminal of the second operational amplifier is connected to the second filter, and the second terminal of the second operational amplifier is connected to the negative terminal of the piezoelectric ceramic module.

[0059] The first boost unit can be a first operational amplifier, the second boost unit can be a second operational amplifier, and the voltage amplification unit can be any device capable of voltage amplification, such as a boost chip. The boost chip is used to boost the first voltage of the electronic device's power supply, i.e., to perform voltage amplification, to obtain a second voltage, and then use the boosted second voltage to power the first and second operational amplifiers. The first operational amplifier is used to send the signal output from the first bandpass filter to the positive terminal of the piezoelectric ceramic module with the second voltage, i.e., to send a third audio signal with the second voltage to the positive terminal of the piezoelectric ceramic module; the second operational amplifier is used to send the signal output from the second bandpass filter to the negative terminal of the piezoelectric ceramic module with the second voltage, i.e., to send a fourth audio signal with the second voltage to the negative terminal of the piezoelectric ceramic module. It can be understood that since the signals output from the first and second bandpass filters are out of phase, the signals output from the first and second operational amplifiers are boosted signals with opposite polarities.

[0060] For example, if the power supply voltage is 3V, the boost chip can boost the power supply voltage to 30V to power the first and second operational amplifiers with a 30V supply voltage. If the phase of the signal output from the first bandpass filter is positive and the phase of the signal output from the second bandpass filter is negative, then the first operational amplifier can output a +30V signal and the second operational amplifier can output a -30V signal.

[0061] The piezoelectric ceramic module can be a piezoelectric ring. It can be understood that the driving voltage on the piezoelectric ring is the difference between the voltage output by the first operational amplifier and the voltage output by the second operational amplifier. For example, if the first operational amplifier can output a +30V signal and the second operational amplifier can output a -30V signal, then the voltage on the piezoelectric ring is 60V. Thus, the driving circuit provided in this application, after boosting the power supply voltage through a boost chip, can further double the voltage through the two operational amplifiers, enhancing the driving capability of the piezoelectric ceramic module.

[0062] The matching circuit module may include a first matching unit and a second matching unit. The second terminal of the first operational amplifier is connected to the first terminal of the first matching unit, and the second terminal of the first matching unit is connected to the positive terminal of the piezoelectric ceramic module. The second terminal of the second operational amplifier is connected to the first terminal of the second matching unit, and the second terminal of the second matching unit is connected to the negative terminal of the piezoelectric ceramic module. The first matching unit is used for impedance matching of the first operational amplifier, and the second matching unit is used for impedance matching of the second operational amplifier. Impedance matching matches the impedances of the input and output circuits of the operational amplifier with the internal impedance of the operational amplifier, ensuring maximum transmission and minimum distortion of the operational amplifier output signal.

[0063] In some embodiments, multiple power amplifiers can be used to drive different audio devices. Figure 6 A schematic diagram of a driving circuit is shown. (For example...) Figure 6 As shown, the driving circuit includes an MCU, a DSP, a first power amplifier, a second power amplifier, a filter module, an operational amplifier module (i.e., the boost module mentioned in this application), a matching circuit module, a piezoelectric ceramic module, and a speaker module; wherein, the first power amplifier is connected to the piezoelectric ceramic module, and the second power amplifier is connected to the speaker module.

[0064] The first power amplifier is used to output a first signal to a first bandpass filter and output a second signal to a second bandpass filter.

[0065] The second power amplifier is used to output a third signal to the positive terminal of the speaker module and a fourth signal to the positive terminal of the speaker module. The third and fourth signals can be the signals mentioned in the seventh signal of this application.

[0066] Figure 6 For introductions to other modules, please refer to the previous text. Figure 4 and Figure 5 The description of that will not be repeated here.

[0067] In some embodiments, a switching module may also be provided between the first power amplifier and the first bandpass filter and the second bandpass filter to control the switching off and on of the first power amplifier and the first bandpass filter, as well as the switching off and on of the first power amplifier and the second bandpass filter.

[0068] In some embodiments, a switch module may also be provided between the first power amplifier and the speaker module to control the switching off and connection between the first power amplifier and the speaker module.

[0069] In some embodiments, a multi-channel power amplifier can be used instead of the multiple power amplifiers described above. Figure 7 A schematic diagram of a driving circuit is shown. (For example...) Figure 7 As shown, the driving circuit includes an MCU, a DSP, a multi-channel power amplifier, a filter module, an operational amplifier module (i.e., the boost module mentioned in this application), a matching circuit module, a piezoelectric ceramic module, and a speaker module; the first channel of the multi-channel power amplifier is connected to the first filter and the second filter respectively, and the second channel of the multi-channel power amplifier is connected to the second audio device.

[0070] The following is combined with Figure 8 The actual test results of the driving circuit of this application on a product are described. The product can be a smartwatch. Figure 8 As shown, when the battery voltage is 3V, the output signals of the audio power amplifier (i.e., the first power amplifier mentioned in this application) are 3V, 3.2V, 3.4V, 3.6V, 3.8V, 4V, 4.2V, and 4.4V, respectively, and the operational amplifier amplification factor is 10, the supply voltage of the operational amplifier is 30V. The theoretical output signal voltages of the operational amplifier are 30V, 31V, 32V, 33V, 34V, 35V, 36V, 37V, and 38V, respectively. The measured output signal voltages are all 55V, and the voltage range without RC and load is 58-60V.

[0071] based on Figure 8 As can be seen, the driving circuit provided in this application embodiment can achieve double voltage boost, enhance driving capability, and meet the driving voltage of the piezoelectric ceramic module.

[0072] In summary, the driving circuit provided in this application embodiment can achieve high-voltage driving of the piezoelectric ceramic module using a differential method while maintaining miniaturization. Furthermore, the driving path for the piezoelectric ceramic module in the driving circuit provided in this application embodiment can share some circuitry with the speaker module, eliminating the need for additional design and significantly reducing the layout area.

[0073] Furthermore, the driving circuit provided in this application embodiment can drive the speaker module to work, or drive the piezoelectric ceramic module to work, or drive the speaker module and the piezoelectric ceramic module simultaneously to achieve bandwidth expansion and improve audio playback effect. In some embodiments, the speaker module and the piezoelectric ceramic module can also be used separately. The piezoelectric ceramic module is used as a communication device, such as for alarms or underwater communication, while the speaker module is used as a playback device, such as for playing music.

[0074] Furthermore, in this embodiment, the signal obtained after filtering by the first bandpass filter and the second bandpass filter is a sine wave signal, while in some comparative embodiments, the driving scheme uses a single-ended method to drive the piezoelectric ceramic module with a pulse width modulation waveform output by the MCU. Compared to the comparative embodiments, the sine wave driving capability provided by this embodiment is twice that of the pulse width modulation waveform.

[0075] In addition, the data corresponding to the target audio that needs to be played by the piezoelectric ceramic module in this embodiment can be stored in the file system for easy reading.

[0076] The audio driving method provided in this application will be described below in conjunction with the circuit described above. The audio driving method mentioned in the embodiments of this application can be used in electronic devices. The electronic device may include the above-described driving circuit. In some embodiments, when it is determined that the first audio device needs to be driven to play target audio, the electronic device may control the power amplifier module to output a first audio signal corresponding to the target audio to the first boost unit, and output a second audio signal corresponding to the target audio to the second boost unit, wherein the first audio signal and the second audio signal are out of phase; control the first boost unit to perform voltage amplification processing on the first audio signal to obtain a third audio signal, and send the third audio signal to the positive terminal of the first audio device; and control the second boost unit to perform voltage amplification processing on the second audio signal to obtain a fourth audio signal, and send the fourth audio signal to the negative terminal of the first audio device.

[0077] In some embodiments, the driving method mentioned in this application may be executed by the processor of an electronic device.

[0078] In some embodiments, audio can be played on different audio devices in different scenarios to meet the needs of different scenarios. Figure 9 A schematic diagram of the implementation process of a driving method is shown. Figure 9The method shown can be used in electronic devices, which may include the aforementioned drive circuitry. For example... Figure 9 As shown, the implementation process of this driving method may include the following steps:

[0079] 901: Incoming call detected.

[0080] It is understandable that incoming calls can include telephone calls, voice calls, video calls, etc.

[0081] 902: Detect environmental noise.

[0082] In some embodiments, ambient sound can be collected via a microphone, and then the processor detects the ambient sound to obtain the ambient noise value of the electronic device. In some embodiments, the ambient noise value of the electronic device can also be obtained via a microphone. In some embodiments, the ambient noise value can be replaced with any data characterizing ambient noise, and this application is not limited thereto.

[0083] 903: Determine whether the environmental noise value is greater than the first threshold.

[0084] If yes, proceed to step 904 to determine if the duration for which the ambient noise value exceeds the first threshold is greater than the first duration. If no, proceed to step 906 to control the speaker module to operate independently.

[0085] For example, the first threshold may be 70 decibels. The first threshold can be determined based on actual needs, and this application does not impose any restrictions.

[0086] 904: Determine whether the duration for which the environmental noise value is greater than the first threshold is greater than the first duration.

[0087] If yes, proceed to 905 to control the piezoelectric ceramic module and the speaker module to work simultaneously. If not, proceed to 906 to control the speaker module to work independently.

[0088] For example, the first duration may be 2 seconds. The first duration can be determined based on actual needs, and this application does not impose any restrictions.

[0089] 905: Controls the simultaneous operation of the piezoelectric ceramic module and the speaker module.

[0090] It is understandable that the speaker module and the piezoelectric ceramic module work together. As a high-frequency extension, the piezoelectric ceramic module can improve the downlink loudness of the call, that is, improve the intelligibility of the call, and further enhance the user experience.

[0091] Furthermore, based on the driving circuit provided in this application, compared with the traditional solution that uses PWM waves and transformers to drive the piezoelectric ceramic module, the speaker module signal and the piezoelectric ceramic module in this application have excellent synchronization and low latency, further improving the user experience.

[0092] 906: Controls the speaker module to work independently.

[0093] It is understood that in this application, when it is determined that the piezoelectric ceramic module needs to play the incoming call audio, the piezoelectric ceramic module can be controlled to work independently. When it is determined that the speaker module needs to play the incoming call audio, the speaker module can be controlled to work independently. When it is determined that both the speaker module and the piezoelectric ceramic module need to play the incoming call audio, both the speaker module and the piezoelectric ceramic module can be controlled to work. The incoming call audio can include the incoming call sound or the other party's voice during the call after it is connected.

[0094] Among them, when the driving circuit is as described above Figures 3 to 5 In the example driving circuit, the piezoelectric ceramic module can be controlled to operate by controlling the power amplifier module to output a first audio signal corresponding to the target audio to the first boost unit and output a second audio signal corresponding to the target audio to the second boost unit. The first boost unit is controlled to amplify the voltage of the first audio signal to obtain a third audio signal and send the third audio signal to the positive terminal of the piezoelectric ceramic module. The second boost unit is controlled to amplify the voltage of the second audio signal to obtain a fourth audio signal and send the fourth audio signal to the negative terminal of the piezoelectric ceramic module.

[0095] In this application, the way to control the operation of the speaker module is to control the first power amplifier to conduct with the speaker module, so that the first power amplifier sends an audio signal to the speaker module and the speaker module emits sound.

[0096] In this application, the way to control the speaker module and the piezoelectric ceramic module to work together is to control the first power amplifier, the piezoelectric ceramic module and the speaker module to be in a connected state, i.e., in a working state, so as to realize that the piezoelectric ceramic module and the speaker module emit sound together.

[0097] For details regarding the specific circuit signal transmission, please refer to... Figures 3 to 5 The relevant circuit descriptions will not be repeated here.

[0098] Among them, when the driving circuit is Figure 6 When using the driving circuit shown, the piezoelectric ceramic module can be controlled to operate in a connected state (i.e., in a working state) by ensuring the first power amplifier and the piezoelectric ceramic module are in contact. Similarly, the speaker module can be controlled to operate in a connected state (i.e., in a working state) by ensuring the second power amplifier and the speaker module are in contact. Alternatively, both the first power amplifier and the piezoelectric ceramic module, as well as the second power amplifier and the speaker module, can operate in a connected state (i.e., in a working state).

[0099] Among them, when the driving circuit is Figure 7When using the driving circuit shown, the piezoelectric ceramic module can be controlled to operate by ensuring that the first channel of the multi-channel power amplifier is connected to the piezoelectric ceramic module (i.e., in an active state). Similarly, the speaker module can be controlled by ensuring that the second channel of the multi-channel power amplifier is connected to the speaker module (i.e., in an active state). Alternatively, both the speaker module and the piezoelectric ceramic module can be controlled to operate by ensuring that both the first channel is connected to the piezoelectric ceramic module and the second channel is connected to the speaker module (i.e., in an active state).

[0100] Based on the above solution, when the ambient noise is low, the speaker module emits sound; when the ambient noise is high, the speaker module and the piezoelectric ceramic module emit sound together. The delay is low and the intelligibility is high, which can give users a better listening experience in noisy environments. In addition, by determining the audio devices to be used through noise thresholds and noise duration thresholds, only the speaker module can be controlled to work when the noise is low, which can reduce the power consumption of electronic devices during playback.

[0101] Figure 10 The diagram shows an electronic device according to an embodiment of this application. The electronic device 10 may include the driving circuit, processor 110, power module 140, memory 180, mobile communication module 130, wireless communication module 120, sensor module 190, audio module 150, camera 170, interface module 160, button 101, and display screen 102 mentioned in this application.

[0102] It is understood that the structures illustrated in the embodiments of the present invention do not constitute a specific limitation on the electronic device 10. In other embodiments of this application, the electronic device 10 may include more or fewer components than illustrated, or combine some components, or split some components, or have different component arrangements. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0103] The processor 110 may include one or more processing units, such as processing modules or processing circuits of a central processing unit, image processor, digital signal processor, microprocessor, artificial intelligence processor, or programmable logic device. Different processing units may be independent devices or integrated into one or more processors. The processor 110 may include storage units for storing instructions and data. In some embodiments, the storage unit in the processor 110 is a cache memory 180, and the processor can be used to execute the driving methods described in the embodiments of this application.

[0104] The power module 140 may include a power supply, a power management component, etc. The power supply may be a battery. The power management component manages the charging of the power supply and the power supply to other modules. In some embodiments, the power management component includes a charging management module and a power management module. The charging management module receives charging input from a charger; the power management module connects to the power supply and the processor 110. The power management module receives input from the power supply and / or the charging management module to supply power to the processor 110, the display 102, the camera 170, and the wireless communication module 120, etc.

[0105] The mobile communication module 130 may include, but is not limited to, antennas, power amplifiers, filters, low-noise amplifiers, etc. The mobile communication module 130 can provide wireless communication solutions, including 2G / 3G / 4G / 5G, for use on the electronic device 10. The mobile communication module 130 can receive electromagnetic waves via the antenna, and perform filtering, amplification, and other processing on the received electromagnetic waves before transmitting them to a modem processor for demodulation. The mobile communication module 130 can also amplify the signal modulated by the modem processor and convert it into electromagnetic waves for radiation via the antenna. In some embodiments, at least some functional modules of the mobile communication module 130 may be housed in the processor 110. In some embodiments, at least some functional modules of the mobile communication module 130 and at least some modules of the processor 110 may be housed in the same device.

[0106] The wireless communication module 120 may include an antenna, which enables the transmission and reception of electromagnetic waves. The wireless communication module 120 can provide solutions for wireless communication applications on the electronic device 10, including wireless local area networks (WLANs) (such as wireless fidelity (Wi-Fi) networks), Bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), and infrared (IR) technologies. The electronic device 10 can communicate with networks and other devices through wireless communication technologies.

[0107] In some embodiments, the mobile communication module 130 and the wireless communication module 120 of the electronic device 10 may also be located in the same module.

[0108] The display screen 102 is used to display human-computer interaction interfaces, images, videos, etc.

[0109] The sensor module 190 may include proximity sensors, pressure sensors, gyroscope sensors, barometric pressure sensors, magnetic sensors, accelerometers, distance sensors, fingerprint sensors, temperature sensors, touch sensors, ambient light sensors, bone conduction sensors, etc. The sensor module is used to detect the user's heart rate, blood oxygen levels, altitude, steps, wearing status, etc.

[0110] The audio module 150 is used to convert digital audio information into analog audio signal output, or to convert analog audio input into digital audio signal. The audio module 150 can also be used for encoding and decoding audio signals. In some embodiments, the audio module 150 may be located in the processor 110, or some functional modules of the audio module 150 may be located in the processor 110. In some embodiments, the audio module 150 may include a speaker module, a piezoelectric ceramic module, an earpiece, a microphone, and a headphone jack. In some embodiments, the speaker module and the piezoelectric ceramic module may also be components of the driving circuit of this application.

[0111] Interface module 160 includes an external memory interface, a universal serial bus (USB) interface, and a subscriber identification module (SIM) card interface. The external memory interface can be used to connect an external memory card, such as a Micro SD card, to expand the storage capacity of the electronic device 10. The external memory card communicates with the processor 110 through the external memory interface to perform data storage. The USB interface is used for communication between the electronic device 10 and other electronic devices. The SIM card interface is used to communicate with the SIM card installed in the electronic device 10, for example, to read or write phone numbers stored in the SIM card.

[0112] In some embodiments, the electronic device 10 further includes buttons 101, a motor, and indicators. The buttons 101 may include volume buttons, a power button, etc. The motor is used to generate a vibration effect in the electronic device 10, for example, vibrating when the user's electronic device 10 is called to prompt the user to answer the call. The indicators may include laser indicators, radio frequency indicators, LED indicators, etc.

[0113] This application provides an electronic device, including a memory for storing instructions executed by one or more processors of the electronic device, and a processor, one of the processors of the electronic device, for executing the driving method mentioned in this application.

[0114] It should be noted that all units / modules mentioned in the device embodiments of this application are logical units / modules. Physically, a logical unit / module can be a physical unit / module, a part of a physical unit / module, or a combination of multiple physical units / modules. The physical implementation of these logical units / modules themselves is not the most important factor; the combination of functions implemented by these logical units / modules is the key to solving the technical problems proposed in this application. Furthermore, to highlight the innovative aspects of this application, the above-described device embodiments of this application have not introduced units / modules that are not closely related to solving the technical problems proposed in this application. This does not mean that the above-described device embodiments do not contain other units / modules.

[0115] It should be noted that in the examples and description of this patent, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0116] Although this application has been illustrated and described with reference to certain preferred embodiments thereof, those skilled in the art should understand that various changes in form and detail may be made thereto without departing from the spirit and scope of this application.

Claims

1. A driving circuit, characterized in that, It includes a power amplifier module, a boost module, and a first audio device, wherein the boost module includes a first boost unit and a second boost unit; The power amplifier module is used to output a first audio signal to the first boost unit and to output a second audio signal to the second boost unit, wherein the first audio signal and the second audio signal are out of phase; The first boost unit is used to amplify the voltage of the first audio signal, obtain a third audio signal, and send the third audio signal to the positive terminal of the first audio device. The second boost unit is used to amplify the voltage of the second audio signal, obtain a fourth audio signal, and send the fourth audio signal to the negative terminal of the first audio device.

2. The driving circuit according to claim 1, characterized in that, The first audio device is a piezoelectric ceramic module.

3. The driving circuit according to claim 2, characterized in that, The power amplifier module includes a first power amplifier, a first filter, and a second filter, wherein the power amplifier is connected to the first filter and the second filter, respectively. The first power amplifier is used to output a fifth audio signal to the first filter and a sixth audio signal to the second filter, wherein the fifth audio signal and the sixth audio signal are out of phase; The first filter is used to filter the fifth audio signal to obtain the first audio signal; The second filter is used to filter the sixth audio signal to obtain the second audio signal.

4. The driving circuit according to claim 3, characterized in that, The first boost unit includes a first operational amplifier, and the second boost unit includes a second operational amplifier; The first terminal of the first operational amplifier is connected to the first filter, and the second terminal of the first operational amplifier is connected to the positive terminal of the piezoelectric ceramic module. The first terminal of the second operational amplifier is connected to the second filter, and the second terminal of the second operational amplifier is connected to the negative terminal of the piezoelectric ceramic module.

5. The driving circuit according to claim 4, characterized in that, The first boost unit further includes a first matching unit, and the second boost unit further includes a second matching unit; The second terminal of the first operational amplifier is connected to the positive terminal of the piezoelectric ceramic module, including: the second terminal of the first operational amplifier is connected to the first terminal of the first matching unit, and the second terminal of the first matching unit is connected to the positive terminal of the piezoelectric ceramic module; The second terminal of the second operational amplifier is connected to the negative terminal of the piezoelectric ceramic module, including: the second terminal of the second operational amplifier is connected to the first terminal of the second matching unit, and the second terminal of the second matching unit is connected to the negative terminal of the piezoelectric ceramic module.

6. The driving circuit according to claim 5, characterized in that, The boost module further includes a voltage amplification unit, the first end of which is connected to the first operational amplifier, and the second end of which is connected to the second operational amplifier; The voltage amplification unit is used to amplify the first voltage of the power supply to obtain the second voltage; The first operational amplifier is used to send the third audio signal to the positive electrode of the piezoelectric ceramic module at the second voltage; The second operational amplifier is used to send the fourth audio signal to the negative terminal of the piezoelectric ceramic module at the second voltage.

7. The driving circuit according to any one of claims 3 to 6, characterized in that, It also includes a switching module and a second audio device, wherein, The switching module is used to control the connection and disconnection between the first power amplifier and the second audio device, and to control the connection and disconnection between the first power amplifier and the piezoelectric ceramic module.

8. The driving circuit according to claim 7, characterized in that, The switching module includes a first switching unit and a second switching unit; The first terminal of the first switching unit is connected to the first power amplifier, the second terminal of the first switching unit is connected to the first filter, and the third terminal of the first switching unit is connected to the positive terminal of the second audio device. The first terminal of the second switching unit is connected to the first power amplifier, the second terminal of the second switching unit is connected to the second filter, and the second terminal of the second switching unit is connected to the negative terminal of the second audio device.

9. The driving circuit according to any one of claims 3 to 6, characterized in that, It also includes a second audio device, and the power amplifier module further includes a second power amplifier, which is connected to the second audio device; The second power amplifier is used to output a seventh audio signal to the second audio device.

10. The driving circuit according to claim 1 or 2, characterized in that, It also includes a second audio device, and the power amplifier module includes a multi-channel power amplifier; The first channel of the multi-channel power amplifier is connected to the first audio device; The second channel of the multi-channel power amplifier is connected to the second audio device.

11. The driving circuit according to any one of claims 8 to 10, characterized in that, The second audio device is a speaker module.

12. The driving circuit according to any one of claims 1 to 6, characterized in that, It also includes a controller and a digital signal processor, among which, The digital signal processor is used to output the eighth audio signal to the digital signal processor; The digital signal processor is used to digitally process the eighth audio signal to obtain the ninth audio signal, and output the ninth audio signal to the power amplifier module.

13. A driving method, characterized in that, For an electronic device, the electronic device comprising the driving circuit according to any one of claims 1 to 12, the method comprising: Determine that the first audio device needs to be driven to play the target audio; The control power amplifier module outputs a first audio signal corresponding to the target audio to a first boost unit, and outputs a second audio signal corresponding to the target audio to a second boost unit, wherein the first audio signal and the second audio signal are out of phase; The system controls the first boost unit to amplify the voltage of the first audio signal, obtain a third audio signal, and send the third audio signal to the positive terminal of the first audio device. The system also controls the second boost unit to amplify the voltage of the second audio signal, obtain a fourth audio signal, and send the fourth audio signal to the negative terminal of the first audio device.

14. The driving method according to claim 13, characterized in that, The step of determining that the first audio device needs to be driven to play the target audio includes: Incoming call detected; Obtain the ambient noise value of the electronic device; If the ambient noise value is greater than a first threshold and the noise duration is greater than a first duration, it is determined that the first audio device and the second audio device need to be driven to play the incoming call audio.

15. The driving method according to claim 14, characterized in that, The method further includes: When the ambient noise value is less than or equal to the first threshold, it is determined that the second audio device needs to be driven to play the incoming call audio. If the ambient noise value is greater than the first threshold and the noise duration is less than or equal to the first duration, it is determined that the second audio device needs to be driven to play the incoming call audio.

16. An electronic device, characterized in that, The driving circuit includes any one of claims 1 to 12.

17. An electronic device comprising: Memory, used to store instructions executed by one or more processors of an electronic device, and The processor is one of the processors in an electronic device, used to execute the driving method according to any one of claims 13 to 15.

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