Power supply circuit, audio player and electronic equipment

Abstract

The utility model discloses a power supply circuit, an audio player and electronic equipment, and belongs to the technical field of electronic equipment. The power supply circuit comprises at least two switching circuits; each switching circuit is connected with an audio power amplifier, each switching circuit is connected with different power supplies, and each power supply is used for providing different power voltages; each switching circuit is used for conducting the audio power amplifier and the power supply connected with the switching circuit under the condition that the value of an audio target parameter is a parameter value corresponding to a target voltage, and the target voltage is the power supply voltage provided by the power supply connected with the switching circuit. The audio target parameters comprise audio playing volume and / or audio output power.

Description

Technical Field

[0001] The present application belongs to the technical field of electronic equipment, and specifically relates to a power supply circuit, an audio player and an electronic device. Background Art

[0002] Currently, external audio playback is one of the main usage scenarios for mobile terminals. However, as the volume and sound quality of mobile terminals increase, their power consumption increases, causing battery life issues for mobile terminals.

[0003] Currently, reducing the audio signal of external audio players is a common method used to reduce power consumption in mobile terminals. For example, unnecessary audio signals are removed from the external audio player, and low-frequency components are reduced in the audio signal at medium and low volumes. However, this reduction in audio signals can lead to reduced sound quality when playing external audio on mobile terminals. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a power supply circuit, an audio player and an electronic device, which at least solve the problem of high power consumption during external audio playback in current mobile terminals.

[0005] In a first aspect, an embodiment of the present application provides a power supply circuit comprising: at least two switch circuits;

[0006] Each of the switch circuits is connected to an audio power amplifier (PA), and each of the switch circuits is connected to a different power supply, and each of the power supply is used to provide a different power supply voltage;

[0007] Each of the switching circuits is used to connect the audio PA to the power supply connected to the switching circuit when the value of the audio target parameter is a parameter value corresponding to a target voltage, wherein the target voltage is the power supply voltage provided by the power supply connected to the switching circuit, and the audio target parameter includes the audio playback volume and / or the audio output power.

[0008] In a second aspect, an embodiment of the present application provides an audio player, comprising: an audio PA, a speaker, and the power supply circuit described in the first aspect.

[0009] In a third aspect, an embodiment of the present application provides an electronic device, which includes the audio player described in the second aspect.

[0010] In an embodiment of the present application, the power supply circuit includes at least two switching circuits. Each switching circuit is connected to a different power supply so that the power supply circuit can provide different power supply voltages for the audio PA. The switching circuit can be used to turn on the power supply connected to the audio PA and the switching circuit when the value of the audio target parameter is a parameter value corresponding to the target voltage, and the target voltage is the power supply voltage provided by the power supply connected to the switching circuit. In this way, compared with the related art, the power supply circuit can select the power supply voltage for the audio PA according to the actual value of the audio target parameter to ensure the power supply efficiency of the power supply of the audio PA. Compared with the related art, on the basis of effectively reducing the power consumption of the circuit where the audio PA is located, there is no need to reduce the external sound quality of the circuit where the audio PA is located, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A circuit diagram of an audio PA circuit provided by the related art is shown;

[0012] Figure 2 A curve diagram showing a change in power supply efficiency of a power supply provided by an embodiment of the present application is shown;

[0013] Figure 3 A circuit diagram of an audio player provided in an embodiment of the present application is shown;

[0014] Figure 4 A circuit diagram of another audio player provided in an embodiment of the present application is shown;

[0015] Figure 5 A circuit diagram of another audio player provided in an embodiment of the present application is shown;

[0016] Figure 6 A curve diagram showing a change in power supply efficiency of another power supply provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0017] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly refer to one or more of the features. Throughout the description of this application, unless otherwise specified, "plurality" means two or more. Furthermore, "and / or" in the specification and claims refers to at least one of the connected entities, and the character " / " generally indicates an "or" relationship between the connected entities.

[0018] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0019] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0020] In order to facilitate understanding of the technical solution of the present application, the principles involved in the technical solution of the present application are explained below in priority.

[0021] like Figure 1 As shown, the audio PA circuit of the mobile terminal includes an audio PA 10 and a speaker 20. The audio playback system in which the audio PA circuit resides also includes a power supply circuit. The power supply circuit is connected to a power supply and the audio PA 10. The power supply is used to provide a power supply voltage. The power supply circuit is used to transmit the power supply voltage to the audio PA 10 to power the audio PA 10. The audio PA 10 is connected to the speaker 20. The audio PA 10 is used to receive an audio signal for external audio playback, amplify the audio signal, and transmit the amplified audio signal to the speaker, so that the speaker 20 can play the audio based on the received audio signal.

[0022] Among them, when the power supply provides different power supply voltages to the audio PA, the power supply efficiency of the power supply varies with the changes in the audio output power (or audio playback volume) of the audio player system. The power supply efficiency of the power supply is the ratio of the output power of the speaker to the output power of the power supply. The higher the power supply efficiency of the power supply, the lower the power consumption of the audio player system per unit time, and the more power-saving it is. Therefore, according to the changes in different power supply voltages with the audio output power (or audio playback volume) of the audio player system, the power supply voltage of the audio player system can be selected according to the actual output power of the audio player system, so as to reduce the power consumption of the audio player system and improve the battery life of the mobile terminal.

[0023] For example, Figure 2 As shown in the figure, when the power supply circuit uses a 4V power supply voltage to power the audio PA, the power supply efficiency of the power supply changes with the audio output power of the audio amplifier system. Figure 2 The curve marked with 4V power supply efficiency. When the power supply circuit uses 8V power supply voltage to power the audio PA, the power supply efficiency of the power supply changes with the audio output power of the audio amplifier system. Figure 2 The curve marked with 8V power supply efficiency. Figure 2 It can be seen that when the audio output power of the audio player system is low (100-800mW), the power supply efficiency of the 4V power supply is higher than that of the 8V power supply. When the audio output power of the audio player system is high (above 800mW), the power supply efficiency of the 8V power supply is higher than that of the 4V power supply. Obviously, if a 4V power supply is used to power the audio PA when the audio output power of the audio player system is low, and an 8V power supply is switched to power the audio PA when the audio output power of the audio player system is low, the power supply efficiency of the audio player system can be effectively kept high, the power consumption of the audio player system can be reduced, and the battery life of the mobile terminal can be improved.

[0024] Please refer to Figure 3 , which shows a circuit diagram of an audio player provided by an embodiment of the present application. Figure 3 As shown, the audio player 3 includes an audio PA 10, a speaker 20, and a power supply circuit 30. The power supply circuit 30 is connected to the audio PA 10 to supply power to the audio PA 10. The audio PA 10 is connected to the speaker 20 to receive an audio signal for external audio playback, amplify the audio signal, and transmit the amplified audio signal to the speaker so that the speaker 20 can play audio based on the received audio signal. The power supply circuit 30 can be the power supply circuit provided in the embodiments of the present application. Specifically, the power supply circuit 30 includes at least two switching circuits 301. Figure 3 For example, the power supply circuit 30 includes two switch circuits 301 . Figure 3 The number of switch circuits 301 shown does not limit the number of switch circuits 301 that the power supply circuit 30 provided in the embodiment of the present application can include.

[0025] Each switching circuit 301 is connected to an audio PA 10 and is connected to a different power supply 2. Each power supply 2 is configured to provide a different power supply voltage. Each switching circuit 301 is configured to control the connection or disconnection between the audio PA 10 and the power supply 2. Each switching circuit 301 is configured to connect the audio PA 10 to the power supply 2 connected to the switching circuit 301 when the value of the audio target parameter is the parameter value corresponding to the target voltage.

[0026] In this embodiment of the present application, the target voltage is the power supply voltage provided by the power supply 2 connected to the switching circuit 301. The audio target parameters are parameters related to the audio player 3 when playing audio. Specifically, the audio target parameters include audio playback volume and / or audio output power. Optionally, the audio target parameters correspond to a power supply voltage. When the power supply circuit 30 uses the power supply voltage corresponding to the actual audio target parameters of the audio player to supply power to the audio PA 10, the power supply efficiency of the power supply is greater than a target efficiency threshold.

[0027] In one embodiment, each switch circuit 301 may store a reference value corresponding to an audio target parameter and a target voltage, where the target voltage is the power supply voltage of the power supply connected to the switch circuit 301. The switch circuit 301 is configured to collect the audio target parameter and determine whether the value of the audio target parameter is the reference value. If the audio target parameter is the reference value, the power supply 2 connected to the audio PA 10 and the switch circuit 301 is connected; if the audio target parameter is not the reference value, the power supply 2 connected to the audio PA 10 and the switch circuit 301 is disconnected.

[0028] In another optional case, the power supply circuit 30 further includes a controller ( Figure 3 (not shown). A controller is connected to each switch circuit 301. The controller is configured to obtain a target voltage corresponding to a target audio parameter, control the target switch circuit 301 to connect the power supply 2 connected thereto to the audio PA 10, and control the remaining switch circuits 301 to disconnect the power supply 2 connected thereto from the audio PA 10. The power supply connected to the target switch circuit is configured to provide the target voltage, and the remaining switch circuits are switch circuits other than the target switch circuit in the at least two switch circuits.

[0029] Further, optionally, the controller stores a correspondence between audio target parameters and power supply voltages. The controller is configured to obtain a target voltage corresponding to the audio target parameters, output a first drive signal to the target switch circuit 301, and output a second drive signal to the remaining switch circuits 301. The first drive signal is configured to control the switch circuit 301 to connect the power supply 2 and the audio PA 10. The second drive signal is configured to control the switch circuit 301 to disconnect the power supply 2 and the audio PA 10.

[0030] Accordingly, the target switch circuit 301 is configured to connect the power supply 2 and the audio PA 10 under the control of the first drive signal. The other switch circuits 301 are configured to disconnect the power supply 2 and the audio PA 10 under the control of the second drive signal. This allows the power supply circuit 30 to supply power to the audio PA 10 using the target voltage, thereby ensuring the power supply efficiency of the power supply 2 connected to the power supply circuit 30.

[0031] In an embodiment of the present application, the power supply circuit includes at least two switching circuits. Each switching circuit is connected to a different power supply so that the power supply circuit can provide different power supply voltages for the audio PA. The switching circuit can be used to turn on the power supply connected to the audio PA and the switching circuit when the value of the audio target parameter is a parameter value corresponding to the target voltage, and the target voltage is the power supply voltage provided by the power supply connected to the switching circuit. In this way, compared with the related art, the power supply circuit can select the power supply voltage for the audio PA according to the actual value of the audio target parameter to ensure the power supply efficiency of the power supply of the audio PA. Compared with the related art, on the basis of effectively reducing the power consumption of the circuit where the audio PA is located, there is no need to reduce the external sound quality of the circuit where the audio PA is located, thereby improving the user experience.

[0032] Alternatively, as Figure 4 As shown, the switching circuit 301 includes a driving unit 3011 and a switching unit 3012. The driving unit 3011 is configured to receive a first driving signal when the value of the audio target parameter is the parameter value and output an on signal to the switching unit 3012. The switching unit 3011 is connected to the audio PA 10 and the power supply 2 and is configured to switch on the audio PA 10 and the power supply 2 under the control of the on signal. Similarly, the driving unit 3011 is configured to output an off signal to the switching unit 3012 when the value of the audio target parameter is not the parameter value and the first driving signal is not received. The switching unit 3011 is configured to disconnect the audio PA 10 and the power supply 2 under the control of the off signal.

[0033] In one embodiment, the power supply circuit 30 includes a controller. A drive unit 3011 is connected to the controller. The controller is configured to obtain a target voltage corresponding to the target audio parameter, output a first drive signal to the drive unit 3011 of the target switch circuit 301, and output a second drive signal to the drive units 3011 of the remaining switch circuits 301. Accordingly, in each switch circuit 301, the drive unit 3011 is configured to output an on signal to the switch unit 3012 upon receiving the first drive signal. The drive unit 3011 is also configured to output an off signal to the switch unit 3012 upon receiving the second drive signal.

[0034] Further optionally, the driving unit 3011 includes a transistor Q1. A first terminal of the transistor Q1 is configured to receive a first driving signal. A second terminal of the transistor Q1 is connected to a conduction signal generating terminal for receiving a conduction signal provided by the conduction signal generating terminal. A third terminal of the transistor Q1 is connected to the switching unit 3012. Under control of the first driving signal, the transistor Q1 is configured to conduct electricity between the second terminal of the transistor Q1 and the third terminal of the transistor Q1, thereby transmitting the conduction signal to the switching unit 3012.

[0035] Similarly, the first terminal of transistor Q1 is also configured to receive a second drive signal. The second terminal of transistor Q1 is connected to the conduction signal generating terminal. The third terminal of transistor Q1 is connected to switch unit 3012. Under control of the second drive signal, transistor Q1 is configured to disconnect the second terminal of transistor Q1 and the third terminal of transistor Q1, thereby transmitting a shutdown signal to switch unit 3012.

[0036] For example, transistor Q1 is a PNP transistor, with a first terminal serving as a base, a second terminal serving as an emitter, and a third terminal serving as a collector. The first drive signal is a low-level signal, and the second drive signal is a high-level signal. Transistor Q1 is connected to a controller. The controller is configured to obtain a target voltage corresponding to a target audio parameter, output a low-level first drive signal to the drive unit 3011 of the target switch circuit 301, and output a high-level second drive signal to the drive units 3011 of the remaining switch circuits 301.

[0037] The transistor Q1 is configured to, upon receiving a first low-level driving signal, turn on the second terminal of the transistor Q1 and the third terminal of the transistor Q1, thereby transmitting an on signal to the switch unit 3012; and upon receiving a second high-level driving signal, turn off the second terminal of the transistor Q1 and the third terminal of the transistor Q1, thereby transmitting an off signal to the switch unit 3012. Furthermore, the transistor Q1 is configured to amplify the on signal / off signal and transmit the amplified signal to the switch unit 3012, thereby improving the driving capability of the on signal / off signal.

[0038] In an alternative case, Figure 4 As shown, the drive unit 3011 further includes a first resistor R1, a second resistor R2, and a third resistor R3. The first resistor R1 is connected to the first end of the transistor Q1 and to the second end of the transistor Q2 via the second resistor R2. The third end of the transistor Q1 is connected to the switch unit 3012 via the third resistor R3. The first resistor R1 and the second resistor R2 cooperate to provide a bias voltage for the transistor Q1, thereby controlling whether the transistor Q1 is turned on or off. The third resistor R3 is used to limit the current flowing into the switch unit 3012, ensuring the normal operation of the switch unit 3012.

[0039] For example, the transistor Q1 is a PNP transistor. The first resistor R1 is connected to the base of the transistor Q1 and to the emitter of the transistor Q2 via the second resistor R2. The collector of the transistor Q1 is connected to the switch unit 3012 via the third resistor R3.

[0040] In some embodiments of the present application, the switch unit 3012 includes a power transistor Q2. The control terminal of the power transistor Q2 is connected to the driver unit 3011, the input terminal of the power transistor Q2 is connected to the power supply 2, and the output terminal of the power transistor Q2 is connected to the audio PA 10. The power transistor Q2 is configured to be turned on by an on signal, thereby connecting the audio PA 10 and the power supply 2. Similarly, the power transistor Q2 is configured to be turned off by an off signal, thereby disconnecting the audio PA 10 from the power supply 2.

[0041] In one embodiment, the power transistor Q2 is a PMOS transistor. The control terminal of the power transistor Q2 is the gate, the input terminal is the source, and the output terminal is the drain. The power transistor Q2 is configured to turn on when the gate receives a low-level signal and to turn off when the gate receives a high-level signal. Accordingly, the turn-on signal generating terminal is grounded to provide a low-level turn-on signal.

[0042] The transistor Q1 is used to turn on the second end of the transistor Q1 and the third end of the transistor Q1 when receiving a first drive signal, and transmit a low-level turn-on signal to the switch unit 3012; and to disconnect the second end of the transistor Q1 and the third end of the transistor Q1 when receiving a second drive signal, and transmit a high-level turn-off signal to the switch unit 3012.

[0043] The power transistor Q2 is configured to be turned on when the gate receives a low-level turn-on signal, connecting the source and drain electrodes to conduct electricity between the audio PA 10 and the power supply 2. The power transistor Q2 is also configured to be turned off when the gate receives a high-level turn-off signal, disconnecting the source and drain electrodes to disconnect the audio PA 10 and the power supply 2.

[0044] Optionally, the switch circuit 301 further includes a first capacitor C1 and a fourth resistor R4. The first capacitor C1 and the fourth resistor R4 are connected in parallel, with one end of the first capacitor C1 and the fourth resistor R4 connected to the power supply 2 and the switch unit 3012, respectively, and the other end connected to the drive unit 3011. The parallel connection of the first capacitor C1 and the fourth resistor R4 is used to prevent circuit backflow and ensure circuit stability.

[0045] In an optional case, at least two switching circuits include a first switching circuit 301. The power supply circuit 30 also includes a low-pass filter 302. The first switching circuit 301 is connected to the power supply through a power management integrated circuit (PMIC) 4. The first switching circuit 301 is connected to the audio PA 10 through the low-pass filter 302. The low-pass filter 302 is used to filter the interference signal output by the PMIC 4. In this way, the low-pass filter 302 can effectively filter out high-frequency interference signals in the power supply voltage signal output by the power supply through the PMIC 4, thereby improving the power supply quality of the first switching circuit 301. By way of example, the low-pass filter 302 can be a second capacitor C2. One end of the second capacitor C2 is connected to the first switching circuit 301. The other end of the second capacitor C2 is grounded.

[0046] In order to better understand the technical solution of the present application, the following is a further introduction using the example of the power supply circuit 30 including a first switch circuit 301 and a second switch circuit 301, with two switch circuits 301 in total. Figure 5 As shown, Figure 5 In order to better distinguish the transistor Q1 and the power transistor Q2 in the first switch circuit 301 and the second switch circuit 301, Figure 5 In the figure, transistor Q1 of the first switch circuit 301 is identified by Q11, transistor Q1 of the second switch circuit 301 is identified by Q12, power transistor Q2 of the first switch circuit 301 is identified by Q21, and power transistor Q2 of the second switch circuit 301 is identified by Q22. Furthermore, it is assumed that transistor Q1 is a PNP transistor and power transistor Q2 is a PMOS transistor. The power supply connected to the first switch circuit 301 is configured to provide a 4V power supply voltage, and the power supply connected to the second switch circuit 301 is configured to provide an 8V power supply voltage.

[0047] In the first switching circuit 301, the base of the transistor Q11 is connected to the first signal terminal INP1 via a first resistor R1, and the first signal terminal INP1 is connected to the controller. The first resistor R1 is also connected to the emitter of the transistor Q11 via a second resistor R2, and the emitter is also grounded. The collector of the transistor Q11 is connected to the gate of the power transistor Q21 via a third resistor R3. The source of the power transistor Q21 is connected to a power supply via a PMIC 4, which is used to provide a 4V power supply voltage through the PMIC 4. The drain of the power transistor Q21 is connected to the audio PA 10 via a second capacitor C2. The first capacitor C1 and the fourth resistor R4 are connected in parallel, and are connected to the source and gate of the power transistor Q21, respectively.

[0048] In the second switching circuit 301, the base of transistor Q12 is connected to the first signal terminal INP2 via a first resistor R1, and the first signal terminal INP2 is connected to the controller. The first resistor R1 is also connected to the emitter of transistor Q12 via a second resistor R2, and the emitter is also grounded. The collector of transistor Q12 is connected to the gate of power transistor Q22 via a third resistor R3. The source of power transistor Q22 is connected to power supply 2, which is a battery that provides an 8V power supply voltage. The drain of power transistor Q22 is connected to audio PA 10. A first capacitor C1 and a fourth resistor R4 are connected in parallel, connected to the source and gate of power transistor Q22, respectively.

[0049] In one embodiment, when the audio target parameter is high (audio output power is greater than 800 mW), the controller is configured to output a low level to the first signal terminal INP2 and a high level to the first signal terminal INP1. Thus, transistor Q11 is turned off, power transistor Q21 is turned off, and the audio PA 10 is disconnected from the 4V power supply. Transistor Q12 is turned on, power transistor Q22 is turned on, and the audio PA 10 is connected to the 8V power supply. The power supply circuit 30 outputs an 8V power supply voltage to the audio PA 10.

[0050] When the audio target parameter is low (audio output power is below 800 mW), the controller outputs a high level to the first signal terminal INP2 and a low level to the first signal terminal INP1. This turns off transistor Q12 and power transistor Q22, disconnecting the audio PA 10 from the 8V power supply. Turning on transistor Q11 and power transistor Q21, the audio PA 10 connects to the 4V power supply, and the power supply circuit 30 outputs a 4V power supply voltage to the audio PA 10.

[0051] In this case, the power supply efficiency of the power supply circuit changes with the audio output power (audio playback volume) as follows: Figure 6 In the curve, the power supply efficiency mark is switched. In addition, Figure 6 It also shows the curve of the power supply efficiency of the power supply circuit changing with the audio output power of the audio amplifier system when the power supply circuit uses a 4V power supply voltage to power the audio PA. Figure 6 The curve marked with 4V power supply efficiency. Figure 6 The figure also shows the curve of the power supply efficiency of the power supply circuit changing with the audio output power of the audio amplifier system when the power supply circuit uses an 8V power supply voltage to power the audio PA. Figure 6 The curve marked with 8V power supply efficiency. Figure 6 It can be seen that the power supply efficiency of the power supply circuit is always high, effectively reducing the power consumption of the circuit where the audio PA is located (ie, the audio player).

[0052] In one example, the maximum audio playback volume of the audio player is 75dB, and accordingly, the maximum audio output power is 480mW. The controller can also be configured to output a low level to the first signal terminal INP2 and a high level to the first signal terminal INP1 when the audio output power is greater than 120mW (i.e., the audio playback volume is greater than 63dB), so that the audio PA 10 is connected to an 8V power supply, and the power supply circuit 30 outputs an 8V power supply voltage to the audio PA 10.

[0053] The controller can also be used to output a high level to the first signal terminal INP2 and a low level to the first signal terminal INP1 when the audio output power is less than 120mW (i.e., the audio playback audio is less than 63dB), so that the audio PA10 is connected to a 4V power supply, and the power supply circuit 30 outputs a 4V power supply voltage to the audio PA10. Figure 6 The audio output power P1 of the power supply circuit is marked when the audio output power is 120mW (i.e., the audio playback audio is 63dB), and the audio output power P2 of the power supply circuit is marked when the audio output power is 480mW (i.e., the audio playback audio is 75dB).

[0054] In an embodiment of the present application, the power supply circuit includes at least two switching circuits. Each switching circuit is connected to a different power supply so that the power supply circuit can provide different power supply voltages for the audio PA. The switching circuit can be used to turn on the power supply connected to the audio PA and the switching circuit when the value of the audio target parameter is a parameter value corresponding to the target voltage, and the target voltage is the power supply voltage provided by the power supply connected to the switching circuit. In this way, compared with the related art, the power supply circuit can select the power supply voltage for the audio PA according to the actual value of the audio target parameter to ensure the power supply efficiency of the power supply of the audio PA. Compared with the related art, on the basis of effectively reducing the power consumption of the circuit where the audio PA is located, there is no need to reduce the external sound quality of the circuit where the audio PA is located, thereby improving the user experience.

[0055] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0056] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A power supply circuit, characterized in that: The power supply circuit includes: at least two switch circuits; Each of the switch circuits is connected to an audio power amplifier, and each of the switch circuits is connected to a different power supply, and each of the power supply is used to provide a different power supply voltage; Each of the switching circuits is used to turn on the audio power amplifier and the power supply connected to the switching circuit when the value of the audio target parameter is a parameter value corresponding to a target voltage, the target voltage is the power supply voltage provided by the power supply connected to the switching circuit, and the audio target parameter includes the audio playback volume and / or audio output power.

2. The power supply circuit according to claim 1, wherein: The switching circuit includes: a driving unit and a switching unit; The driving unit is configured to receive a first driving signal when the audio target parameter is the parameter value, and output a conduction signal to the switch unit; The switch unit is connected to the audio power amplifier and the power supply, and is configured to conduct the audio power amplifier and the power supply under the control of the conduction signal.

3. The power supply circuit according to claim 2, wherein: The driving unit includes: a triode; The first end of the transistor is used to receive the first drive signal, the second end of the transistor is connected to the conduction signal generating end, and is used to receive the conduction signal provided by the conduction signal generating end, the third end of the transistor is connected to the switching unit, and the transistor is used to conduct the second end and the third end under the control of the first drive signal, and transmit the conduction signal to the switching unit.

4. The power supply circuit according to claim 3, characterized in that: The driving unit further includes: a first resistor, a second resistor and a third resistor; The first resistor is connected to the first end of the transistor and is connected to the second end of the transistor through the second resistor. The third end of the transistor is connected to the switch unit through the third resistor.

5. The power supply circuit according to claim 2, characterized in that: The switch unit includes: a power tube; The control end of the power tube is connected to the driving unit, the input end of the power tube is connected to the power supply, the output end of the power tube is connected to the audio power amplifier, and the power tube is used to be turned on under the control of the conduction signal.

6. The power supply circuit according to claim 2, characterized in that: The switch circuit further includes: a first capacitor and a fourth resistor; The first capacitor and the fourth resistor are connected in parallel, and one end of the first capacitor and the fourth resistor are connected to the power supply and the switch unit respectively, and the other end is connected to the driving unit.

7. The power supply circuit according to claim 1, characterized in that: The at least two switch circuits include a first switch circuit, and the power supply circuit further includes a low-pass filter; The first switching circuit is connected to the power supply through a power management integrated circuit. The first switching circuit is connected to the audio power amplifier through the low-pass filter. The low-pass filter is used to filter the interference signal output by the power management integrated circuit.

8. The power supply circuit according to claim 1, wherein: The power supply circuit further includes: a controller; The controller is connected to each of the switching circuits, and is used to obtain a target voltage corresponding to an audio target parameter, and to control the power supply connected thereto to be turned on by the target switching circuit, and to control the power supply connected thereto to be disconnected from the audio power amplifier by the remaining switching circuits. The power supply connected to the target switching circuit is used to provide the target voltage, and the remaining switching circuits are the switching circuits other than the target switching circuit among the at least two switching circuits.

9. An audio player, characterized in that The audio player comprises: an audio power amplifier, a speaker and the power supply circuit according to any one of claims 1 to 8.

10. An electronic device, characterized in that: The electronic device includes the audio player according to claim 9.

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