Driving circuit and method, and electronic device

Abstract

The present application relates to the technical field of audio driving, and in particular to a driving circuit and method, and an electronic device. The method may comprise: disposing two boost units at an output end of a power amplifier to respectively receive two phase-opposed signals output by the power amplifier, so that boosted signals output by the two boost units are also phase-opposed signals; and configuring one of the boost units to be connected to the positive electrode of a piezoelectric ceramic module, and the other boost unit to be connected to the negative electrode of the piezoelectric ceramic module, thereby increasing driving voltage of the piezoelectric ceramic module. The boost units have a simple structure, occupy a minimal area on a circuit board, and are thus effectively applicable to miniaturized electronic devices.

Description

A driving circuit, method and electronic device

[0001] The present application claims priority to the Chinese patent application No. 202410808237.6, filed on June 20, 2024, and entitled "A driving circuit, method and electronic device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of audio driving technology, and in particular, to a driving circuit, method and electronic device. BACKGROUND

[0003] With the increasing functions of electronic devices, the audio devices in the electronic devices are also gradually increasing. For example, the audio devices can include traditional loudspeakers and piezoelectric ceramics. Among them, the loudspeakers are used for playing call sounds, playing music, etc. The piezoelectric ceramics are generally used for playing alarm audio, communicating underwater, etc. due to their high signal frequency and the ability to make sound underwater.

[0004] Among them, the driving voltage required by the piezoelectric ceramic is much higher than that of the traditional loudspeaker. Therefore, the conventional driving voltage of the electronic device is generally difficult to meet the driving of the piezoelectric ceramic. For example, the conventional driving voltage of some electronic devices is 10v, while the driving voltage of the piezoelectric ceramic is 60v. In some embodiments, an H-bridge and a transformer driving circuit are added in the electronic device to realize voltage boosting, thereby realizing the driving of the piezoelectric ceramic. However, the layout of the H-bridge and the transformer driving circuit is complex and occupies a large area of the circuit board, which makes it difficult to be applied to miniaturized electronic devices (such as the smart watch shown in FIG. 1). SUMMARY

[0005] To solve the problem that the layout of the H-bridge and the transformer driving circuit is complex and occupies a large area of the circuit board, which makes it difficult to be applied to miniaturized electronic devices, the present application provides a driving circuit, method and electronic device.

[0006] In a first aspect, the present application provides a driving circuit, comprising a power amplifier module, a boosting module and a first audio device, the boosting module comprising a first boosting unit and a second boosting unit;

[0007] The power amplifier module is configured to output a first audio signal to the first boosting unit and output a second audio signal to the second boosting unit, wherein the phases of the first audio signal and the second audio signal are opposite.

[0008] The first voltage boosting unit is configured to perform voltage amplification 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 the second voltage boosting unit is configured to perform voltage amplification 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.

[0009] According to the scheme, the driving voltage can be doubled, and the driving voltage of the piezoelectric ceramic module can be met. For example, when one of the voltage boosting units (for example, the first voltage boosting unit) outputs a signal of +30v, and the other voltage boosting unit (for example, the second voltage boosting unit) outputs a signal of -30v, the voltage on the piezoelectric ceramic module is the difference between +30v and -30v, that is, 60v. It can be understood that the voltage boosting unit has a simple structure, occupies a small area of the circuit board, and can be effectively applied to small electronic devices.

[0010] In a possible implementation of the first aspect, the first audio device is a piezoelectric ceramic module.

[0011] 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 perform filter processing on the fifth audio signal to obtain the first audio signal; and the second filter is configured to perform filter processing on the sixth audio signal to obtain the second audio signal.

[0012] 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.

[0013] 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 the 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 the negative electrode of the piezoelectric ceramic module.

[0014] 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 to the positive electrode of the piezoceramic module, including that the second end of the first operational amplifier is connected to the first end of the first matching unit, and the second end of the first matching unit is connected to the positive electrode of the piezoceramic module; the second end of the second operational amplifier is connected to the negative electrode of the piezoceramic module, including that the second end of the second operational amplifier is connected to the first end of the second matching unit, and the second end of the second matching unit is connected to the negative electrode of the piezoceramic module.

[0015] 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 to the first operational amplifier, and a second end of the voltage amplification unit is connected to 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.

[0016] 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.

[0017] 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 to the first operational amplifier, and a second end of the voltage amplification unit is connected to 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.

[0018] In a possible implementation of the first aspect, the switch module includes a first switch unit and a second switch unit; a first end of the first switch unit is connected to the first power amplifier, a second end of the first switch unit is connected to the first filter, and a third end of the first switch unit is connected to the positive electrode of the second audio device; a first end of the second switch unit is connected to the first power amplifier, a second end of the second switch unit is connected to the second filter, and a second end of the second switch unit is connected to the negative electrode of the second audio device.

[0019] In the embodiments of the present application, the switch 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 connected with the loudspeaker module and disconnected with the piezoelectric ceramic module; when an alarm sound needs to be played, the first power amplifier is controlled to be connected with the piezoelectric ceramic module and disconnected with the loudspeaker module.

[0020] In a possible implementation of the first aspect, the power amplifier module further includes a second power amplifier, and the second power amplifier is connected with a second audio device; the second power amplifier is configured to output a seventh audio signal to the second audio device.

[0021] In some embodiments, multiple power amplifiers can be provided to drive different audio devices.

[0022] In a possible implementation of the first aspect, the power amplifier module includes a multi-channel power amplifier; a first channel of the multi-channel power amplifier is connected with the first audio device; and a second channel of the multi-channel power amplifier is connected with a second audio device.

[0023] In a possible implementation of the first aspect, the second audio device is a loudspeaker module.

[0024] In a possible implementation of the first aspect, the power amplifier module further includes 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.

[0025] In a second aspect, the present application provides a driving method for an electronic device, the electronic device including the driving circuit mentioned in the present application. The method includes: determining that a first audio device needs to be driven to play a target audio; controlling a power amplifier module to output a first audio signal corresponding to the target audio to a first voltage boosting unit, and output a second audio signal corresponding to the target audio to a 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 a 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 a negative electrode of the first audio device.

[0026] In a possible implementation of the second aspect, determining that the first audio device needs to be driven to play the target audio includes:

[0027] Detecting an incoming call; obtaining an ambient noise value of the electronic device; determining, corresponding to the ambient noise value being greater than a first threshold value and a noise duration being greater than a first time length, that the first audio device and the second audio device need to be driven to play incoming call audio.

[0028] It can be understood that the loudspeaker module and the piezoelectric ceramic module work simultaneously, and the piezoelectric ceramic module is used as an extension of high frequency, which can improve the loudness of the downlink call, i.e., improve the intelligibility of the call, and further improve the user experience.

[0029] In a possible implementation of the second aspect, the method further includes: determining, corresponding to the ambient noise value being less than or equal to the first threshold value, that the second audio device needs to be driven to play the incoming call audio; and determining, corresponding to the ambient noise value being greater than the first threshold value and the noise duration being less than or equal to the first time length, that the second audio device needs to be driven to play the incoming call audio.

[0030] In a third aspect, the present application provides an electronic device, which includes the driving circuit mentioned in the present application.

[0031] In a fourth aspect, the present application provides an electronic device, which includes 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

[0032] FIG. 1 shows a schematic diagram of a smart watch according to some embodiments of the present application;

[0033] FIG. 2 shows a schematic diagram of a loudspeaker driving circuit structure according to some embodiments of the present application;

[0034] FIG. 3 shows a schematic diagram of a first driving circuit structure according to some embodiments of the present application;

[0035] FIG. 4 shows a schematic diagram of a second driving circuit structure according to some embodiments of the present application;

[0036] FIG. 5 shows a schematic diagram of a third driving circuit structure according to some embodiments of the present application;

[0037] FIG. 6 shows a schematic diagram of a fourth driving circuit structure according to some embodiments of the present application;

[0038] FIG. 7 shows a schematic diagram of a fifth driving circuit structure according to some embodiments of the present application;

[0039] FIG. 8 shows a measured effect of the driving circuit on a product according to some embodiments of the present application;

[0040] FIG. 9 shows a flowchart of a driving method according to some embodiments of the present application;

[0041] FIG. 10 shows a schematic diagram of an electronic device, according to some embodiments of the present application. DETAILED DESCRIPTION

[0042] Illustrative embodiments of the present application include, but are not limited to, a driving circuit, a method and an electronic device.

[0043] 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.

[0044] To more clearly understand the scheme of the present application, first, the driving principle of the loudspeaker is introduced in combination with the loudspeaker driving circuit structure shown in FIG. 2.

[0045] As shown in FIG. 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, the power amplifier performs power amplification processing on the signal M1 to obtain a signal M2, and the signal M2 is sent 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 adopts differential signal technology at present, which splits the input signal into two signals with opposite phases, then performs power amplification processing on the two signals with opposite phases respectively and outputs, so as to improve the fidelity of the power amplifier output audio signal.

[0046] It can be understood that, as described above, 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 (for example, 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 a 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 and the like).

[0047] To solve the above problems, the application provides a driving circuit. Based on the characteristic that the signals output by the power amplifier in the above-mentioned loudspeaker module driving circuit are two-phase opposite signals, two boost units are arranged at the output end of the power amplifier, which respectively receive the two-phase opposite signals output by the power amplifier, so as to realize that the boosted signals output by the two boost units are also two-phase opposite signals. In addition, based on the fact that the voltage on the electronic device is the potential difference between the positive electrode and the negative electrode (i.e. the difference between the positive electrode voltage and the negative electrode voltage), one of the boost units is connected to the positive electrode of the piezoelectric ceramic module, and the other boost unit is connected to the negative electrode 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 unit.

[0048] For example, as described above, the maximum driving voltage that the current boost unit can provide is 30V, based on the scheme of the application, when one of the boost units outputs a signal of +30v and the other boost unit outputs a signal of -30v, the voltage on the piezoelectric ceramic module is the difference between +30v and -30v, that is, 60v, so that the driving voltage of the piezoelectric ceramic module can be met. It can be understood that the boost unit has a simple structure and occupies a small area of the circuit board, which can be effectively applied in small electronic devices.

[0049] For example, FIG. 3 shows a schematic diagram of a driving circuit. As shown in FIG. 3, 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; wherein the first audio device is a piezoelectric ceramic module.

[0050] The power amplifier module is used to output a first audio signal to the first boost unit and output a second audio signal to the second boost unit, wherein the first audio signal and the second audio signal are opposite in phase;

[0051] The first voltage boosting unit is configured to perform voltage amplification processing on the first audio signal, obtain a third audio signal, and send the third audio signal to the positive electrode of the first audio device; and the second voltage boosting unit is configured to perform voltage amplification processing on the second audio signal, obtain a fourth audio signal, and send the fourth audio signal to the negative electrode of the first audio device.

[0052] The structure of the driving circuit provided by the embodiment of the present application will be described in detail below.

[0053] FIGS. 4 and 5 respectively show a schematic diagram of a driving circuit. As shown in FIG. 4, 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 voltage boosting module mentioned in the present application), a matching circuit module, a piezoelectric ceramic module, and a second audio device. The power amplifier module and the filtering module can belong to the components of the power amplifier module mentioned above, the second audio device can be a loudspeaker module, and the processor can be an MCU.

[0054] As shown in FIG. 5, the first power amplifier can be a small power amplifier, which can further reduce the occupied area of the driving circuit.

[0055] The MCU can be configured to send a signal corresponding to an audio to be played (e.g., signal MO, i.e., the eighth audio signal mentioned in the present application) to the DSP for processing. The DSP is configured to send the processed signal (e.g., signal M1, i.e., the ninth audio signal mentioned in the present application) to the first power amplifier. The first power amplifier is configured to perform power amplification processing on the signal M1 to generate a differential signal M2, wherein the differential signal M2 can include a first signal (i.e., the fifth audio signal mentioned in the present application) and a second signal (i.e., the sixth audio signal mentioned in the present application), and the first signal and the second signal are signals with opposite phases.

[0056] The switch module can include a first switch unit and a second switch unit. The first switch unit can include a first switch S1, and the second switch unit can include a second switch S2. The filter module includes a first filter and a second filter. The first filter can be a first band-pass filter, and the second filter can be a second band-pass filter. The first switch S1 is used to control the disconnection and connection of the first power amplifier with the first band-pass filter and the positive electrode (SPK+) of the speaker module. The second switch S2 is used to control the disconnection and connection of the first power amplifier with the second band-pass filter and the negative electrode (SPK-) of the speaker module. For example, when the piezoelectric ceramic module needs to be driven and the speaker module does not need to be driven, the first switch and the second switch can control the first power amplifier to be connected with the first band-pass filter and the second band-pass filter, respectively. For example, when the speaker module needs to be driven and the piezoelectric ceramic module does not need to be driven, the first switch and the second switch can control the first power amplifier to be disconnected with the first band-pass filter and the second band-pass filter, respectively, and control the first power amplifier to be connected with the positive electrode (SPK+) and the negative electrode (SPK-) of the speaker module. Through the switch module, different audio devices can be used to play audio in different scenarios. For example, when music needs to be played, the first power amplifier is controlled to be connected with the speaker module and disconnected with the piezoelectric ceramic module; when an alarm sound needs to be played, the first power amplifier is controlled to be connected with the piezoelectric ceramic module and disconnected with the speaker module.

[0057] The first band-pass filter is used to filter the first signal transmitted by the first power amplifier, and the second band-pass filter is used to filter the second signal transmitted by the first power amplifier, so as to obtain two signals (i.e., the first audio signal and the second audio signal mentioned in the present application) within the bandwidth range of the piezoelectric ceramic module driving signal, which are signals with opposite phases. The filtering range of the first band-pass filter and the second band-pass filter can be 5 kHz-15 kHz. This value is only illustrative, and can be set according to actual needs, which is not limited herein.

[0058] It can be understood that the bandwidth of the signal output by the power amplifier is generally a signal within a relatively wide range (for example, 20 Hz-3 MHz). Therefore, a filter needs to be arranged at the output end of the power amplifier to screen the signal output by the power amplifier, so as to obtain a signal (for example, 5 kHz-15 kHz) within the bandwidth range of the piezoelectric ceramic module driving signal. It can be understood that, by screening the signal output by the first power amplifier through the first band-pass filter and the second band-pass filter, invalid signals can be effectively filtered, the signal-to-noise ratio of the signal can be improved, and better results can be obtained.

[0059] The operational amplifier module comprises a first voltage boosting unit, a second voltage boosting unit and a voltage amplification unit, the first end of the voltage amplification unit is connected with the first operational amplifier, the second end of the voltage amplification unit is connected with the second operational amplifier; the first end of the first operational amplifier is connected with the first filter, the second end of the first operational amplifier is connected with the positive pole of the piezoelectric ceramic module; the first end of the second operational amplifier is connected with the second filter, the second end of the second operational amplifier is connected with the negative pole of the piezoelectric ceramic module.

[0060] The first voltage boosting unit can be a first operational amplifier, the second voltage boosting unit can be a second operational amplifier, and the voltage amplification unit can be any device capable of voltage amplification, such as a voltage boosting chip. The voltage boosting chip is used to boost the first voltage of the power supply of the electronic device, i.e., perform voltage amplification processing, obtain a second voltage, and supply power to the first operational amplifier and the second operational amplifier with the boosted second voltage. The first operational amplifier is used to send the signal output by the first band-pass filter to the positive pole of the piezoelectric ceramic module with the second voltage, i.e., send a third audio signal with the second voltage to the positive pole of the piezoelectric ceramic module; the second operational amplifier is used to send the signal output by the second band-pass filter to the negative pole of the piezoelectric ceramic module with the second voltage, i.e., send a fourth audio signal with the second voltage to the negative pole of the piezoelectric ceramic module. It can be understood that, since the signal output by the first band-pass filter and the signal output by the second band-pass 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 being boosted.

[0061] For example, the power supply voltage is 3v, and the voltage boosting chip can boost the power supply voltage to 30v to supply power to the first operational amplifier and the second operational amplifier with a supply voltage of 30v. If the phase of the signal output by the first band-pass filter is positive and the phase of the signal output by the second band-pass filter is negative, the first operational amplifier can output a signal of +30v, and the second operational amplifier can output a signal of -30v.

[0062] 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, when the first operational amplifier can output a signal of +30v and the second operational amplifier can output a signal of -30v, the voltage on the piezoelectric ring is 60v. In this way, the driving circuit provided by the present application can further double the voltage through two operational amplifiers after boosting the power supply voltage through the voltage boosting chip, thereby enhancing the driving capability of the piezoelectric ceramic module.

[0063] The matching circuit module can include a first matching unit and a second matching unit, the second end of the first operational amplifier is connected with the first end of the first matching unit, and the second end of the first matching unit is connected with the positive electrode of the piezoelectric ceramic module; the second end of the second operational amplifier is connected with the first end of the second matching unit, and the second end of the second matching unit is connected with the negative electrode 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. Wherein, the impedance matching can realize matching of the input and output circuit impedance of the operational amplifier with the internal impedance of the operational amplifier, to ensure the maximum transmission and the lowest distortion of the operational amplifier output signal.

[0064] In some embodiments, a plurality of power amplifiers can also be provided to drive different audio devices. FIG. 6 shows a schematic diagram of a driving circuit. As shown in FIG. 6, 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 the present application), a matching circuit module, a piezoelectric ceramic module, and a speaker module; wherein the first power amplifier is in communication with the piezoelectric ceramic module, and the second power amplifier is in communication with the speaker module.

[0065] The first power amplifier is used for outputting a first signal to the first band-pass filter and outputting a second signal to the second band-pass filter.

[0066] The second power amplifier is used for outputting a third signal to the positive electrode of the speaker module and outputting a fourth signal to the positive electrode of the speaker module. Wherein, the third signal and the fourth signal can be signals in the seventh signal mentioned in the present application.

[0067] The descriptions of other modules in FIG. 6 are referred to the descriptions of FIG. 4 and FIG. 5 above, which will not be introduced here.

[0068] In some embodiments, a switch module can also be provided between the first power amplifier and the first band-pass filter and the second band-pass filter, for controlling the switching off and communication of the first power amplifier with the first band-pass filter and the first power amplifier with the second band-pass filter.

[0069] In some embodiments, a switch module can also be provided between the first power amplifier and the speaker module, for controlling the switching off and communication of the first power amplifier with the speaker module.

[0070] In some embodiments, the multiple power amplifiers described above can also be replaced by a multi-channel power amplifier, and FIG. 7 shows a schematic diagram of a driving circuit. As shown in FIG. 7, 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 the present application), a matching circuit module, a piezoelectric ceramic module, and a speaker module; a first channel of the multi-channel power amplifier is connected with a first filter and a second filter respectively, and a second channel of the multi-channel power amplifier is connected with a second audio device.

[0071] The actual measurement effect of the driving circuit of the present application on a product is described below in connection with FIG. 8. The product can be a smart watch. As shown in FIG. 8, when the battery voltage is 3V, the output signals of the audio power amplifier (i.e., the first power amplifier mentioned in the present application) are 3V, 3.2V, 3.4V, 3.6V, 3.8V, 4V, 4.2V, 4.4V respectively, the supply voltage of the operational amplifier is 30V when the amplification factor of the operational amplifier is 10 times, the theoretically output signal voltage of the operational amplifier is 30V, 31V, 32V, 33V, 34V, 35V, 36V, 37V, 38V respectively, and the actually measured output signal voltage is 55V. The voltage range without RC and load is 58-60V.

[0072] As can be seen from FIG. 8, the driving circuit provided by the embodiments of the present application can achieve double boost, enhance the driving capability, and meet the driving voltage of the piezoelectric ceramic module.

[0073] In summary, the driving circuit provided by the embodiments of the present application can achieve high-voltage driving of the piezoelectric ceramic module in a differential manner on the basis of miniaturization. In addition, the piezoelectric ceramic module driving path in the driving circuit provided by the embodiments of the present application can share part of the circuit with the speaker module, and does not need to be designed additionally, which can greatly reduce the layout area.

[0074] In addition, the driving circuit provided by the embodiments of the present application can drive the speaker module to work, or drive the piezoelectric ceramic module to work, or simultaneously drive the speaker module and the piezoelectric ceramic module to achieve frequency bandwidth expansion and improve the audio playing 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, for example, for alarm, underwater communication, etc., and the speaker module is used as a playing device, for example, for playing music, etc.

[0075] In addition, the signal obtained after being filtered by the first band-pass filter and the first band-pass filter in the embodiments of the present application is a sine wave signal, and the driving scheme in some comparative embodiments is that the MCU outputs a pulse width modulation waveform in a single-ended manner to drive the piezoelectric ceramic module. Compared with the comparative embodiments, the driving capability of the sine wave provided by the embodiments of the present application is twice that of the pulse width modulation waveform.

[0076] In addition, the data corresponding to the target audio that needs to be played by the piezoelectric ceramic module in the embodiments of the present application can exist in the file system, facilitating reading.

[0077] The audio driving method provided by the present application will be introduced below in combination with the above-mentioned circuit. The audio driving method mentioned in the embodiments of the present application can be used in an electronic device, which can include the above-mentioned driving circuit. In some embodiments, when it is determined that the first audio device needs to be driven to play the target audio, the electronic device can control the power amplifier module to output the first audio signal corresponding to the target audio to the first voltage boosting unit and output the 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; control the first voltage boosting unit to perform voltage amplification processing on the first audio signal to obtain the third audio signal and send the third audio signal to the positive electrode of the first audio device; and control the second voltage boosting unit to perform voltage amplification processing on the second audio signal to obtain the fourth audio signal and send the fourth audio signal to the negative electrode of the first audio device.

[0078] In some embodiments, the driving method mentioned in the present application can be executed by the processor of the electronic device.

[0079] In some embodiments, different audio devices can be used to play audio in different scenarios to meet the needs of different scenarios. FIG. 9 shows an implementation flowchart of a driving method. The method shown in FIG. 9 can be used in an electronic device, which can include the driving circuit mentioned in the foregoing. As shown in FIG. 9, the implementation flow of the driving method can include the following steps:

[0080] 901: detecting an incoming call.

[0081] It can be understood that the incoming call can include a telephone incoming call, a voice call incoming call, a video call incoming call, etc.

[0082] 902: detecting environmental noise.

[0083] In some embodiments, the surrounding environmental sound can be collected through a microphone, and then the processor detects the surrounding environmental sound to obtain the environmental noise value of the electronic device. In some embodiments, the environmental noise value of the electronic device can also be obtained through a microphone. In some embodiments, the environmental noise value can be replaced by any data representing environmental noise, which is not limited in the present application.

[0084] 903: determining whether the environmental noise value is greater than a first threshold value.

[0085] If yes, go to 904 to determine whether the duration that the environmental noise value is greater than the first threshold value is greater than a first duration. If no, go to 906 to control the speaker module to work alone.

[0086] For example, the first threshold value may be 70 decibels, which can be determined based on actual needs, without limitation.

[0087] 904: Determine whether the duration that the ambient noise value is greater than the first threshold value is greater than a first duration.

[0088] If yes, go to 905, control the piezoelectric ceramic module and the speaker module to work simultaneously. If no, go to 906, control the speaker module to work alone.

[0089] For example, the first duration may be 2 seconds, which can be determined based on actual needs, without limitation.

[0090] 905: Control the piezoelectric ceramic module and the speaker module to work simultaneously.

[0091] It can be understood that the speaker module and the piezoelectric ceramic module work simultaneously, and the piezoelectric ceramic module works as an extension of high frequency, which can improve the loudness of the downlink call and improve the intelligibility of the call, further improving the user experience.

[0092] In addition, based on the driving circuit provided in the present application, compared with the scheme of driving the piezoelectric ceramic module by using the PWM wave and the transformer, the synchronization of the speaker module signal and the piezoelectric ceramic module in the present application is very good, the delay is low, and the user experience is further improved.

[0093] 906: Control the speaker module to work alone.

[0094] It can be understood that in the present application, when it is determined that the piezoelectric ceramic module needs to play the incoming call audio, the piezoelectric ceramic module is controlled to work alone. When it is determined that the speaker module needs to play the incoming call audio, the speaker module is controlled to work alone. When it is determined that the speaker module and the piezoelectric ceramic module need to play the incoming call audio together, the speaker module and the piezoelectric ceramic module are controlled to work. The incoming call audio can include the incoming call sound and the sound of the opposite party during the call after the call is connected.

[0095] When the driving circuit is the driving circuit shown in FIGS. 3-5, the way of controlling the piezoelectric ceramic module to work can be that the power amplifier module outputs the first audio signal corresponding to the target audio to the first voltage boosting unit, and outputs the second audio signal corresponding to the target audio to the second voltage boosting unit, controls the first voltage boosting unit to perform voltage amplification processing on the first audio signal to obtain the third audio signal, and sends the third audio signal to the positive electrode of the piezoelectric ceramic module, and controls the second voltage boosting unit to perform voltage amplification processing on the second audio signal to obtain the fourth audio signal, and sends the fourth audio signal to the negative electrode of the piezoelectric ceramic module.

[0096] In the present application, the manner of controlling the speaker module to work can be to control the first power amplifier to be in conduction with the speaker module, so as to realize that the first power amplifier sends the audio signal to the speaker module, and the speaker module makes sound.

[0097] In the present application, the manner of controlling the speaker module and the piezoelectric ceramic module to work together can be to control the first power amplifier to be in conduction with both the piezoelectric ceramic module and the speaker module, i.e., in a working state, so as to realize that the piezoelectric ceramic module and the speaker module make sound together.

[0098] The details of the specific circuit signal transmission are shown in the circuit descriptions related to FIGS. 3-5, which will not be repeated here.

[0099] When the driving circuit is the driving circuit shown in FIG. 6, the manner of controlling the piezoelectric ceramic module to work can be to control the first power amplifier to be in conduction with the piezoelectric ceramic module, i.e., in a working state, and the manner of controlling the speaker module to work can be to control the second power amplifier to be in conduction with the speaker module, i.e., in a working state. The manner of controlling the speaker module and the piezoelectric ceramic module to work together can be to control the first power amplifier to be in conduction with the piezoelectric ceramic module and the second power amplifier to be in conduction with the speaker module, i.e., in working states.

[0100] When the driving circuit is the driving circuit shown in FIG. 7, the manner of controlling the piezoelectric ceramic module to work can be to control the first channel of the multi-channel power amplifier to be in conduction with the piezoelectric ceramic module, i.e., in a working state, and the manner of controlling the speaker module to work can be to control the second channel of the multi-channel power amplifier to be in conduction with the speaker module, i.e., in a working state. The manner of controlling the speaker module and the piezoelectric ceramic module to work together can be to control the first channel to be in conduction with the piezoelectric ceramic module and the second channel to be in conduction with the speaker module, i.e., in working states.

[0101] Based on the above scheme, when the noise around the user is small, the speaker module is used to make sound, and when the noise around the user is large, the speaker module and the piezoelectric ceramic module make sound together, which has a low delay and a high intelligibility, so that the user can have a better auditory experience in a noisy environment. In addition, by using the noise threshold and the noise duration threshold to determine the audio device to be used, only the speaker module can be controlled to work when the noise is small, so that the power consumption of the electronic device during playing can be reduced.

[0102] FIG. 10 shows a schematic diagram of an electronic device according to an embodiment of the present application. The electronic device 10 can include the driving circuit, the processor 110, the power supply module 140, the memory 180, the mobile communication module 130, the wireless communication module 120, the sensor module 190, the audio module 150, the camera 170, the interface module 160, the key 101, and the display screen 102, etc.

[0103] It can be understood that the structure illustrated by the embodiments of the present application does not constitute a specific limitation on the electronic device 10. In other embodiments of the present application, the electronic device 10 can include more or fewer components than those illustrated, or combine certain components, or split certain components, or different arrangement of components. The illustrated components can be implemented in hardware, software, or a combination of software and hardware.

[0104] The processor 110 can include one or more processing units, for example, can include a central processor, an image processor, a digital signal processor, a microprocessor, an artificial intelligence processor, or a programmable logic device, and the like processing module or processing circuit. Among them, different processing units can be independent devices, or can be integrated in one or more processors. The storage unit can be provided in the processor 110, which is used to store 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 method in the embodiments of the present application.

[0105] The power module 140 can include a power supply, a power management component, and the like. The power supply can be a battery. The power management component is used to manage 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 is used to receive charging input from the charger; the power management module is used to connect the power supply, the charging management module and the processor 110. The power management module receives the input of the power supply and / or the charging management module, and supplies power to the processor 110, the display screen 102, the camera 170, and the wireless communication module 120, and the like.

[0106] The mobile communication module 130 can include, but not limited to, an antenna, a power amplifier, a filter, a low noise amplifier, and the like. The mobile communication module 130 can provide a solution including 2G / 3G / 4G / 5G wireless communication applied to the electronic device 10. The mobile communication module 130 can receive electromagnetic waves by the antenna, and filter, amplify, and the like process the received electromagnetic waves, and transmit to the 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 by the antenna to radiate out. In some embodiments, at least part of the function modules of the mobile communication module 130 can be arranged in the processor 110. In some embodiments, at least part of the function modules of the mobile communication module 130 and at least part of the modules of the processor 110 can be arranged in the same device.

[0107] The wireless communication module 120 can include an antenna and implement the transceiving of electromagnetic waves via the antenna. The wireless communication module 120 can provide a solution for wireless communication including wireless local area networks (WLAN) (e.g., a wireless fidelity (Wi-Fi) network), Bluetooth (BT), a global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), infrared (IR) technology, etc., which are applied to the electronic device 10. The electronic device 10 can communicate with a network and other devices through the wireless communication technology.

[0108] In some embodiments, the mobile communication module 130 and the wireless communication module 120 of the electronic device 10 can also be located in the same module.

[0109] The display screen 102 is used to display a human-computer interaction interface, an image, a video, etc.

[0110] The sensor module 190 can include a proximity light sensor, a pressure sensor, a gyro sensor, a barometric pressure sensor, a magnetic sensor, an acceleration sensor, a distance sensor, a fingerprint sensor, a temperature sensor, a touch sensor, an ambient light sensor, a bone conduction sensor, etc. The sensor module is used to detect a user's heart rate, blood oxygen, altitude, step count, wearing state, etc.

[0111] The audio module 150 is used to convert digital audio information into an analog audio signal output or convert an analog audio input into a digital audio signal. The audio module 150 can also be used to encode and decode an audio signal. In some embodiments, the audio module 150 can be disposed in the processor 110, or part of the function modules of the audio module 150 can be disposed in the processor 110. In some embodiments, the audio module 150 can include a speaker module, a piezoelectric ceramic module, an earpiece, a microphone, and a headset interface. In some embodiments, the speaker module and the piezoelectric ceramic module can also be a component of the driving circuit of the present application.

[0112] The interface module 160 includes an external memory interface, a universal serial bus (USB) interface, and a subscriber identification module (SIM) card interface, etc. 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 realize data storage functions. The universal serial bus interface is used for communication between the electronic device 10 and other electronic devices. The subscriber identification module card interface is used to communicate with the SIM card installed in the electronic device 10, such as reading the phone number stored in the SIM card, or writing the phone number into the SIM card.

[0113] In some embodiments, the electronic device 10 further includes a key 101, a motor, and an indicator, etc. The key 101 can include a volume key, a power on / off key, etc. The motor is used to generate a vibration effect of the electronic device 10, such as generating a vibration when the electronic device 10 of the user is called to prompt the user to answer the call of the electronic device 10. The indicator can include a laser indicator, a radio frequency indicator, an LED indicator, etc.

[0114] The present application provides an electronic device, comprising 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.

[0115] It should be noted that each unit / module mentioned in each device embodiment of the present application is a logical unit / module. In the physical aspect, one logical unit / module can be one physical unit / module, or a part of one physical unit / module, or a combination of multiple physical unit / modules. The physical implementation of the logical unit / module itself is not the most important. The combination of the functions implemented by the logical unit / module is the key to solving the technical problems proposed in the present application. In addition, in order to highlight the innovative part of the present application, the above-mentioned device embodiments of the present application do not introduce the units / modules that are not closely related to solving the technical problems proposed in the present application, which does not mean that the above-mentioned device embodiments do not have other units / modules.

[0116] It has to be noted that, in the description of the application and in the claims the terms "including" and "having" and the like are used in the sense of "including at least the recited entity or entities, but not excluding others". Furthermore, the terms "first", "second" and the like are used merely as labels, i.e. they are used to distinguish between two entities that have the same or similar characteristics, but do not necessarily indicate a particular order or sequence. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises a", "comprising", or "comprises" does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0117] While the application has been illustrated and described in detail in the drawings and foregoing description, such illustration and description are to be considered illustrative or exemplary and not restrictive; the application is not limited to the disclosed embodiments.

Claims

1. A drive circuit characterized by comprising: The power amplifier module, the boost module and the first audio device, the boost module includes a first boost unit and a second boost unit; The power amplifier module is used for outputting a first audio signal to the first boost unit and outputting a second audio signal to the second boost unit, wherein the first audio signal and the second audio signal are opposite in phase; The first boost unit is used for voltage amplification processing of the first audio signal, obtaining a third audio signal, and sending the third audio signal to the positive electrode of the first audio device, and the second boost unit is used for voltage amplification processing of the second audio signal, obtaining a fourth audio signal, and sending the fourth audio signal to the negative electrode of the first audio device.

2. The drive circuit according to claim 1, characterized by The first audio device is a piezoelectric ceramic module.

3. The drive circuit according to claim 2, characterized in that, 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 respectively; The first power amplifier is used for outputting a fifth audio signal to the first filter and outputting a sixth audio signal to the second filter, wherein the fifth audio signal and the sixth audio signal are opposite in phase; The first filter is used for filtering processing of the fifth audio signal to obtain the first audio signal; The second filter is used for filtering processing of the sixth audio signal to obtain the second audio signal.

4. The drive 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 end of the first operational amplifier is connected with the first filter, and the second end of the first operational amplifier is connected with the positive electrode of the piezoelectric ceramic module; The first end of the second operational amplifier is connected with the second filter, and the second end of the second operational amplifier is connected with the negative electrode of the piezoelectric ceramic module.

5. The drive 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 end of the first operational amplifier connected with the positive electrode of the piezoelectric ceramic module includes that the second end of the first operational amplifier is connected with the first end of the first matching unit, and the second end of the first matching unit is connected with the positive electrode of the piezoelectric ceramic module; The second end of the second operational amplifier connected with the negative electrode of the piezoelectric ceramic module includes that the second end of the second operational amplifier is connected with the first end of the second matching unit, and the second end of the second matching unit is connected with the negative electrode of the piezoelectric ceramic module.

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

7. The drive circuit according to any one of claims 3 to 6, characterized in that, The application further comprises a switch module and a second audio device, wherein, the switch module is configured to control the connection and disconnection of the first power amplifier and the second audio device, and to control the connection and disconnection of the first power amplifier and the piezoelectric ceramic module.

8. The drive circuit according to claim 7, characterized in that, The switch module comprises a first switch unit and a second switch unit. The first end of the first switch unit is connected to the first power amplifier, the second end of the first switch unit is connected to the first filter, and the third end of the first switch unit is connected to the positive electrode of the second audio device. The first end of the second switch unit is connected to the first power amplifier, the second end of the second switch unit is connected to the second filter, and the second end of the second switch unit is connected to the negative electrode of the second audio device.

9. The drive circuit according to any one of claims 3 to 6, characterized by, The application further comprises a second audio device, and the power amplifier module further comprises a second power amplifier, wherein the second power amplifier is connected to the second audio device. The second power amplifier is configured to output a seventh audio signal to the second audio device.

10. The drive circuit according to claim 1 or 2, characterized in that, The application further comprises a second audio device, and the power amplifier module comprises 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 drive circuit according to any one of claims 8 to 10, characterized in that, The second audio device is a loudspeaker module.

12. The drive circuit according to any one of claims 1 to 6, characterized by, The application further comprises a controller and a digital signal processor, wherein, 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.

13. A driving method, comprising: An electronic device comprising the drive circuit of any one of claims 1 to 12, 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 to 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 in opposite phases; controlling the first voltage boosting unit to perform voltage amplification processing on the first audio signal to obtain a third audio signal, and sending 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 sending the fourth audio signal to the negative electrode of the first audio device.

14. The driving method according to claim 13, wherein The determination that the first audio device needs to be driven to play target audio comprises: detecting an incoming call; obtaining an environmental noise value of the electronic device; corresponding to the environmental noise value being greater than a first threshold value and the noise duration being greater than a first time length, determining that the first audio device and the second audio device need to be driven to play incoming call audio.

15. The driving method according to claim 14, wherein The method further comprises: corresponding to the environmental noise value being less than or equal to the first threshold value, determining that the second audio device needs to be driven to play incoming call audio; Corresponding to the ambient noise value being greater than the first threshold value and the noise duration being less than or equal to the first time length, it is determined that the second audio device needs to be driven to play the incoming call audio.

16. An electronic device, comprising: The drive circuit according to any one of claims 1 to 12.

17. An electronic device comprising: a memory for storing instructions for execution by one or more processors of the electronic device, and a processor, one of the processors of the electronic device, configured to perform the drive method according to any one of claims 13 to 15.

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