CN106878864B

CN106878864B - Power supply circuit and audio device

Info

Publication number: CN106878864B
Application number: CN201710124116.XA
Authority: CN
Inventors: 唐强; 刘绍斌
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2017-03-03
Filing date: 2017-03-03
Publication date: 2020-07-10
Anticipated expiration: 2037-03-03
Also published as: CN106878864A

Abstract

The invention discloses a power supply circuit, which comprises a power supply conversion circuit and a voltage stabilizing circuit, wherein the power supply conversion circuit is connected with the voltage stabilizing circuit, the power supply conversion circuit is used for converting an alternating current power supply into a direct current power supply, the voltage stabilizing circuit comprises two stages of L DO voltage regulators which are connected in series, and the two stages of L DO voltage regulators are used for carrying out voltage reduction treatment on the direct current power supply twice.

Description

Power supply circuit and audio device

Technical Field

The invention relates to the technical field of electronic circuits, in particular to a power supply circuit and audio equipment.

Background

In the related art, in order to obtain higher-quality audio, a high-quality audio capacitor or ultra-low noise linear voltage regulator is often adopted to improve a power supply, however, the method generally cannot obtain a required ultra-low noise power supply, for example, the power supply is easily interfered by power frequency noise, and the like, audio indexes cannot be extremely high, and cost is increased.

Disclosure of Invention

The embodiment of the invention provides a power supply circuit and audio equipment.

The power supply circuit comprises a power supply conversion circuit and a voltage stabilizing circuit, wherein the power supply conversion circuit is connected with the voltage stabilizing circuit and is used for converting an alternating current power supply into a direct current power supply, the voltage stabilizing circuit comprises a two-stage L DO voltage stabilizer connected in series, and the two-stage L DO voltage stabilizer is used for carrying out voltage reduction treatment on the direct current power supply twice.

The audio device of the embodiment of the present invention includes the power supply circuit of the embodiment of the present invention.

The power supply circuit and the audio equipment of the embodiment of the invention adopt the two-stage L DO voltage stabilizer connected in series to carry out voltage reduction processing on the power supply for two times, and the processed power supply can be provided for the audio circuit, so that the obtained power supply has low noise.

Additional aspects and advantages of embodiments of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a functional block diagram of a power supply circuit according to an embodiment of the present invention.

FIG. 2 is a functional block diagram of a voltage regulator circuit according to an embodiment of the present invention.

FIG. 3 is a circuit diagram of a first voltage regulator circuit according to an embodiment of the present invention.

FIG. 4 is a circuit diagram of a second voltage regulator circuit according to an embodiment of the present invention.

Description of the main elements and symbols:

the power supply circuit 10, the power conversion circuit 12, the transformer 121, the rectification module 122, the filtering module 123, the voltage stabilizing circuit 14, the first voltage stabilizing circuit 142, the first-stage L DO voltage stabilizer 1421, the first filtering module 1422, the second filtering module 1423, the first discharging module 1424, the voltage regulating module 1425, the interference absorbing module 1426, the third filtering module 1427, the first load 1428, the second voltage stabilizing circuit 143, the second-stage L DO voltage stabilizer 1431, the fourth filtering module 1432, the fifth filtering module 1433, the second discharging module 1434, the sixth filtering module 1435, and the second load 1436;

the capacitor comprises a first inductor L1, a second inductor L2, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a first polar capacitor CE1, a second polar capacitor CE2, a third polar capacitor CE3, a first diode D1, a second diode D2, a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for the purpose of illustrating the embodiments of the present invention and are not to be construed as limiting the embodiments of the present invention.

Referring to fig. 1, a power circuit 10 according to an embodiment of the present invention includes a power conversion circuit 12 and a voltage regulator circuit 14, the power conversion circuit 12 is connected to the voltage regulator circuit 14, the power conversion circuit 12 is configured to convert an ac power into a dc power, the voltage regulator circuit 14 includes a two-stage L DO voltage regulator connected in series, and the two-stage L DO voltage regulator is configured to perform two voltage reduction processes on the dc power.

The power supply circuit 10 of the embodiment of the invention adopts the two-stage L DO voltage stabilizer 141 connected in series to perform voltage reduction processing on the power supply twice, and can provide the processed power supply for the audio circuit, so that the obtained power supply has low noise.

In some embodiments, the power conversion circuit 12 includes a transformer 121, a rectifying module 122, and a filtering module 123 connected in sequence. The primary side of the transformer 121 is used for connecting an ac power supply. The rectifying module 122 is configured to convert an ac signal output from the secondary side of the transformer 121 into a dc signal. The filtering module 123 is configured to filter an interference signal in the dc signal to obtain a dc power.

In one example, the transformer 121 may be a toroidal transformer. The toroidal transformer has good output characteristic and anti-interference capability, high electrical efficiency and good heat dissipation condition, and can be widely applied to various electric equipment and other electronic equipment with higher technical requirements.

In one example, the rectifier module 122 includes a silicon bridge circuit. The rectification module 122 may employ a full-wave rectification circuit composed of a silicon bridge circuit. When the rectifying module 122 includes a silicon bridge circuit, two input terminals of the silicon bridge circuit are connected to the secondary terminal of the transformer 121, one output terminal of the silicon bridge circuit is connected to the filtering module 123 and the voltage stabilizing circuit 14, and the other output terminal of the silicon bridge circuit is grounded.

In one example, the filtering module 123 includes a filtering capacitor. One end of the filter capacitor is connected to the rectifier module 122 and the voltage regulator circuit 14, and the other end of the filter capacitor is grounded. When the rectifying module 122 includes a silicon bridge circuit, one end of the filter capacitor is connected to one output end of the silicon bridge circuit.

Referring to fig. 2, in some embodiments, the voltage regulator circuit 14 includes a first voltage regulator circuit 142 and a second voltage regulator circuit 143, the first voltage regulator circuit 142 includes a first stage L DO regulator 1421, the second voltage regulator circuit 143 includes a second stage L DO regulator 1431, the first stage L DO regulator 1421 is used for performing a first voltage reduction process on the dc power, and the second stage L DO regulator 1431 is used for performing a second voltage reduction process on the dc power after the first voltage reduction process is performed.

Specifically, the first stage L DO regulator 1421 and the second stage L DO regulator 1431 form a two-stage L DO regulator connected in series, in one example, the voltage output by the power conversion circuit 12 may be 5V, the voltage is reduced to 3.3V after the first step-down processing is performed by the first stage L DO regulator 1421, and the voltage is reduced to 1.2V after the second step-down processing is performed by the second stage L DO regulator 1431, so that the generated power noise is low, and the power conversion circuit can be used for supplying power to the audio circuit and enabling the audio circuit to have higher standard audio indexes and tone quality.

Referring to fig. 3, in some embodiments, the first voltage regulator circuit 142 further includes a first filter module 1422, a second filter module 1423, a first discharge module 1424, a voltage regulator module 1425, an interference absorption module 1426, a third filter module 1427, and a first load 1428, the first filter module 1422 is connected to the rectifier module 122, the first discharge module 1424, the first stage L DO regulator 1421, and the second filter module 1423, the first stage L DO regulator 1421 is connected to the voltage regulator module 1425, the third filter module 1427, the first load 1428, and the second voltage regulator circuit 143, the voltage regulator module 1425 is connected to the interference absorption module 1426, the first filter module 1422, the second filter module 1423, and the third filter module 1427 are configured to filter noise interference in the dc power supply, the first discharge module 1424 is configured to rapidly discharge the first voltage regulator circuit 142 when the power supply circuit is powered off, the voltage regulator module 1425 is configured to adjust a voltage value output by the first voltage regulator circuit 142, and the first voltage regulator module 1426 is configured to absorb interference signals in the first voltage regulator circuit 142142.

Thus, the first voltage regulator circuit 142 is used to implement the first voltage reduction processing on the dc power supply.

In some embodiments, the first filtering module 1422 includes a first inductor L1, one end of the first inductor L1 is connected to the rectifying module 122, and the other end of the first inductor L1 is connected to the first discharging module 1424, the input terminal of the first stage L DO regulator 1421, and the second filtering module 1423.

Specifically, in the embodiment of the present invention, one end of the first inductor L1 is used as an input end of the first filtering module 1422, and the other end of the first inductor L1 is used as an output end of the first filtering module 1422, the first inductor L1 is used for filtering high frequency noise in the circuit.

In some embodiments, the second filtering module 1423 includes a first capacitor C1, one end of the first capacitor C1 is connected to the first filtering module 1422, the first discharging module 1424, and the input terminal of the first stage L DO regulator 1421, and the other end of the first capacitor C1 is grounded.

Specifically, in the embodiment of the present invention, one end of the first capacitor C1 is used as an input end of the second filtering module 1423, and the other end of the first capacitor C1 is used as an output end of the second filtering module 1423. The first capacitor C1 is used to provide a bypass path to ground for high frequency noise in the circuit.

In some embodiments, the first discharging module 1424 includes a first diode D1, the cathode of the first diode D1 is connected to the first filtering module 1422, the input of the first stage L DO regulator 1421 and the second filtering module 1423, the anode of the first diode D1 is connected to the output of the first stage L DO regulator 1421, the voltage regulating module 1425, the third filtering module 1427, the first load 1428 and the second voltage regulating circuit 143.

Specifically, when the power supply circuit is powered off, the power conversion circuit 12 does not supply power, the line load of the input terminal AVDD of the first voltage stabilizing circuit 142 is large, and the power down is fast, while the output terminal AVDD1 of the first voltage stabilizing circuit 142 is slow, so that the discharging of the output terminal AVDD1 of the first voltage stabilizing circuit 142 can be accelerated by the first diode D1.

In some embodiments, the voltage regulation module 1425 includes a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected to the first discharging module 1424, the output terminal of the first stage L DO regulator 1421, the third filtering module 1427, the first load 1428 and the second voltage stabilizing circuit 143, the other end of the first resistor R1 is connected to the adjusting terminal of the first stage L DO regulator 1421, one end of the second resistor R2 and the interference absorption module 1426, and the other end of the second resistor R2 is grounded.

Specifically, in the embodiment of the invention, one end of the first resistor R1 is used as the output end of the first stabilizing circuit 142. The voltage value outputted by the first regulating circuit 142 is determined by the ratio of the first resistor R1 to the second resistor R2. In this manner, the adjustment of the voltage value of the output of the first stabilizing circuit 142 can be achieved by adjusting the ratio of the first resistor R1 and the second resistor R2.

In some embodiments, the interference absorption module 1426 includes a second capacitance C2. One end of the second capacitor C2 is connected to the voltage regulating module 1425, and the other end of the second capacitor C2 is grounded.

In this way, the second capacitor C2 is used to absorb the interference in the first regulation circuit 142, so that the first regulation circuit 142 can avoid self-oscillation due to over sensitivity.

In some embodiments, the third filtering module 1427 includes a third capacitor C3 and a first polar capacitor CE1, one end of the third capacitor C3 is connected to the first discharging module 1424, the output terminal of the first stage L DO regulator 1421, the voltage regulating module 1425, the positive electrode of the first polar capacitor CE1, the first load 1428 and the second voltage regulating circuit 143, the other end of the third capacitor C3 is grounded, and the negative electrode of the first polar capacitor CE1 is grounded.

Specifically, the third capacitor C3 is used for filtering high frequency noise in the circuit, and the first polar capacitor CE1 has a larger capacitance value for filtering low frequency noise in the circuit.

In some embodiments, the first load 1428 includes a third resistor R3. one end of the third resistor R3 is connected to the first discharging module 1424, the output terminal of the first stage L DO regulator 1421, the voltage regulating module 1425, the third filtering module 1427, and the second voltage regulating circuit 143. the other end of the third resistor R3 is connected to ground.

In this way, the third resistor R3 can prevent the load in the circuit from being too light to cause self-oscillation.

Referring to fig. 4, in some embodiments, the second voltage stabilizing circuit 143 further includes a fourth filtering module 1432, a fifth filtering module 1433, a second discharging module 1434, a sixth filtering module 1435 and a second load 1436, the fourth filtering module 1432 is connected to the first voltage stabilizing circuit 142, the second discharging module 1434, the second stage L DO voltage regulator 1431 and the fifth filtering module 1433, the second stage L DO voltage regulator 1431 is connected to the sixth filtering module 1435 and the second load 1436, the fourth filtering module 1432, the fifth filtering module 1433 and the sixth filtering module 1435 are configured to filter noise interference in the dc power, and the second discharging module 1434 is configured to discharge the second voltage stabilizing circuit 143 quickly when the power circuit is removed.

In this way, the second voltage stabilizing circuit 143 is configured to perform the second voltage reduction processing on the dc power supply subjected to the first voltage reduction processing.

In some embodiments, the fourth filtering module 1432 includes a second inductor L2, one end of the second inductor L2 is connected to the first voltage regulating circuit 142, and the other end of the second inductor L2 is connected to the second discharging module 1434, the input terminal of the second stage L DO voltage regulator 1431, and the fifth filtering module 1433.

Specifically, in the embodiment of the present invention, one end of the second inductor L2 is used as an input end of the fourth filtering module 1432, and the other end of the second inductor L2 is used as an output end of the fourth filtering module 1432, the second inductor L2 is used for filtering high frequency noise in the circuit.

In some embodiments, the fifth filtering module 1433 includes a second polar capacitor CE2 and a fourth capacitor C4. the anode of the second polar capacitor CE2 is connected to the input of the fourth filtering module 1432, the second discharging module 1434, the second stage L DO regulator 1431 and one end of the fourth capacitor C4. the cathode of the second polar capacitor CE2 is connected to ground, and the other end of the fourth capacitor C4 is connected to ground.

Specifically, the fourth capacitor C4 is used for filtering high frequency noise in the circuit, and the second polar capacitor CE2 is used for filtering low frequency noise in the circuit.

In some embodiments, the second discharge module 1434 includes a second diode D2. having a cathode of a second diode D2 coupled to the fourth filtering module 1432, an input of the second stage L DO regulator 1431, and a fifth filtering module 1433 an anode of the second diode D2 is coupled to an output of the second stage L DO regulator 1431, a sixth filtering module 1435, and a second load 1436.

Specifically, when the power supply circuit is powered off, the power conversion circuit 12 does not supply power, the line load of the input terminal AVDD1 of the second voltage stabilizing circuit 143 has a large power-down speed, and the output terminal of the second voltage stabilizing circuit 143 has a slow power-down speed, so that the discharge of the output terminal of the second voltage stabilizing circuit 143 can be accelerated by the second diode D2.

In some embodiments, the sixth filtering module 1435 includes a fifth capacitor C5 and a third polar capacitor CE 3. one end of the fifth capacitor C5 is connected to the second discharging module 1434, the output terminal of the second stage L DO regulator 1431, the positive electrode of the third polar capacitor CE3, and the second load 1436. the other end of the fifth capacitor C5 is connected to ground, and the negative electrode of the third polar capacitor CE3 is connected to ground.

Specifically, the fifth capacitor C5 is used for filtering high frequency noise in the circuit, and the third polar capacitor CE3 has a larger capacitance value for filtering low frequency noise in the circuit.

In some embodiments, the second load 1436 includes a fourth resistor R4. one terminal of the fourth resistor R4 is connected to the second discharging module 1434, the output terminal of the second stage L DO regulator 1431, and the sixth filtering module 1435. the other terminal of the fourth resistor R4 is connected to ground.

In this way, the fourth resistor R4 can prevent the load in the circuit from being too light to cause self-oscillation.

It is noted that in the present embodiment, the regulation terminal of the second stage L DO regulator 1431 is grounded.

The audio device of the embodiment of the present invention includes the power supply circuit 10 of any of the above embodiments.

The audio device of the embodiment of the invention adopts the two-stage L DO voltage stabilizer 141 connected in series to carry out two-stage voltage reduction processing on the power supply, and can provide the processed power supply for the audio circuit, so that the obtained power supply has low noise.

Specifically, the audio device may be, but is not limited to, an audio device such as a power amplifier, a sound box, a multimedia console, a digital sound console, an audio sampling card, a synthesizer, a middle-high frequency sound box, a microphone, a sound card in a PC, an earphone, and a DVD player.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.

The above disclosure provides many different embodiments or examples for implementing different configurations of embodiments of the invention. In order to simplify the disclosure of embodiments of the invention, specific example components and arrangements are described above. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, embodiments of the invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. In addition, embodiments of the present invention provide examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

In the description herein, references to the description of the terms "one embodiment," "certain embodiments," "an illustrative embodiment," "an example," "a specific example" or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.

The logic and/or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processing module-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.

It should be understood that portions of embodiments of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.

In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. An audio device, comprising:

an audio circuit; and

the audio circuit comprises an audio circuit, a power supply circuit and a voltage stabilizing circuit, wherein the audio circuit is used for supplying power to the audio circuit, the power supply circuit comprises a power supply conversion circuit and a voltage stabilizing circuit, the power supply conversion circuit is connected with the voltage stabilizing circuit, the power supply conversion circuit is used for converting an alternating current power supply into a direct current power supply, the voltage stabilizing circuit comprises two stages of L DO voltage regulators which are connected in series, and the two stages of L DO voltage regulators are used for carrying out voltage reduction processing on the direct current power;

the voltage stabilizing circuit comprises a first voltage stabilizing circuit and a second voltage stabilizing circuit, the first voltage stabilizing circuit comprises a first-stage L DO voltage stabilizer and a first discharging module, the first discharging module comprises a first diode, the negative electrode of the first diode is connected with the input end of the first-stage L DO voltage stabilizer, the positive electrode of the first diode is connected with the output end of the first-stage L DO voltage stabilizer, the second voltage stabilizing circuit comprises a second-stage L DO voltage stabilizer and a second discharging module, the second discharging module comprises a second diode, the negative electrode of the second diode is connected with the input end of the second-stage L DO voltage stabilizer, the positive electrode of the second diode is connected with the output end of the second-stage L DO voltage stabilizer, the first-stage L DO voltage stabilizer is used for carrying out first voltage reduction processing on the direct current power supply, the first discharging module is used for carrying out rapid discharging on the first voltage stabilizing circuit when the power supply circuit is powered off, the second-stage L DO voltage stabilizer is used for carrying out second voltage reduction processing on the direct current power supply after the first voltage reduction processing, and the second discharging module is used for carrying out rapid discharging on the second voltage stabilizing circuit when the.

2. The audio device according to claim 1, wherein the power conversion circuit includes a transformer, a rectification module and a filtering module, which are connected in sequence, the primary side of the transformer is used for connecting the ac power, the rectification module is used for converting an ac signal output by the secondary side of the transformer into a dc signal, and the filtering module is used for filtering an interference signal in the dc signal to obtain the dc power.

3. The audio device of claim 2, wherein the first voltage regulator circuit further comprises a first filter module, a second filter module, a voltage regulator module, an interference absorption module, a third filter module, and a first load, the first filter module is connected to the rectifier module, the first discharge module, the first stage L DO regulator, and the second filter module, the first stage L DO regulator is connected to the voltage regulator module, the third filter module, the first load, and the second voltage regulator circuit, the voltage regulator module is connected to the interference absorption module, the first filter module, the second filter module, and the third filter module are configured to filter noise interference in the DC power supply, the voltage regulator module is configured to regulate a voltage value output by the first voltage regulator circuit, and the interference absorption module is configured to absorb an interference signal in the first voltage regulator circuit.

4. The audio device as in claim 3, wherein said first filtering module comprises a first inductor, one end of said first inductor is connected to said rectifying module, and the other end of said first inductor is connected to said first discharging module, an input terminal of said first stage L DO regulator, and said second filtering module.

5. The audio device of claim 3, wherein the second filtering module comprises a first capacitor, one end of the first capacitor is connected to the first filtering module, the first discharging module, and an input of the first stage L DO regulator, and the other end of the first capacitor is connected to ground.

6. The audio device of claim 3, wherein the cathode of the first diode is further coupled to the first filter module and the second filter module, and the anode of the first diode is further coupled to the voltage regulation module, the third filter module, the first load, and the second regulation circuit.

7. The audio device as claimed in claim 3, wherein the voltage regulating module comprises a first resistor and a second resistor, one end of the first resistor is connected to the first discharging module, the output terminal of the first stage L DO regulator, the third filtering module, the first load and the second voltage regulator, the other end of the first resistor is connected to the adjusting terminal of the first stage L DO regulator, one end of the second resistor and the interference absorbing module, and the other end of the second resistor is connected to ground.

8. The audio device of claim 3, wherein the interference absorbing module comprises a second capacitor, one end of the second capacitor is connected to the voltage regulating module, and the other end of the second capacitor is grounded.

9. The audio device of claim 3, wherein the third filtering module comprises a third capacitor and a first polar capacitor, one end of the third capacitor is connected to the first discharging module, the output terminal of the first stage L DO regulator, the voltage regulating module, the positive electrode of the first polar capacitor, the first load and the second voltage regulator circuit, the other end of the third capacitor is grounded, and the negative electrode of the first polar capacitor is grounded.

10. The audio device of claim 3, wherein the first load comprises a third resistor, one end of the third resistor is connected to the first discharging module, the output of the first stage L DO regulator, the voltage regulating module, the third filtering module, and the second voltage regulator circuit, and the other end of the third resistor is connected to ground.

11. The audio device of claim 2, wherein said second voltage regulator circuit further comprises a fourth filter module, a fifth filter module, a sixth filter module, and a second load, said fourth filter module coupled to said first voltage regulator circuit, said second discharge module, said second stage L DO regulator, and said fifth filter module, said second stage L DO regulator coupled to said sixth filter module and said second load, said fourth filter module, said fifth filter module, and said sixth filter module configured to filter noise interference in said DC power supply.

12. The audio device of claim 11, wherein the fourth filtering module comprises a second inductor, one end of the second inductor is connected to the first voltage regulator circuit, and the other end of the second inductor is connected to the second discharging module, the input of the second stage L DO voltage regulator, and the fifth filtering module.

13. The audio device of claim 11, wherein the fifth filtering module comprises a second polar capacitor and a fourth capacitor, an anode of the second polar capacitor is connected to the fourth filtering module, the second discharging module, the input terminal of the second stage L DO regulator, and one end of the fourth capacitor, a cathode of the second polar capacitor is connected to ground, and another end of the fourth capacitor is connected to ground.

14. The audio device of claim 11, wherein the cathode of the second diode is further connected to the fourth filtering module and the fifth filtering module, and the anode of the second diode is further connected to the sixth filtering module and the second load.

15. The audio device as claimed in claim 11, wherein the sixth filtering module comprises a fifth capacitor and a third polar capacitor, one end of the fifth capacitor is connected to the second discharging module, the output terminal of the second stage L DO regulator, the positive electrode of the third polar capacitor and the second load, the other end of the fifth capacitor is grounded, and the negative electrode of the third polar capacitor is grounded.

16. The audio device as in claim 11, wherein said second load comprises a fourth resistor, one end of said fourth resistor is connected to said second discharging module, an output of said second stage L DO regulator and said sixth filtering module, and the other end of said fourth resistor is connected to ground.