CN106878864B - Power circuits and audio equipment - Google Patents

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 circuits and audio equipment

technical field

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

Background technique

In the related art, in order to obtain higher-quality audio, high-quality audio capacitors or ultra-low noise linear regulators are often used to improve the power supply. However, this method generally cannot obtain the required ultra-low noise power supply, such as The power supply is easily interfered by power frequency noise, etc., the audio indicators cannot be maximized, and the cost is increased. Specifically, the frequency of power frequency noise (50Hz-60Hz) is extremely low, and it is in the audio frequency range, so it is difficult to filter it out through a common LC filter network. The single-stage linear regulator cannot filter it directly, and its noise flows into the rear stage of the audio circuit, which will interfere with the analog audio signal.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a power supply circuit and an audio device.

The power supply circuit according to the embodiment of the present invention includes a power conversion circuit and a voltage stabilizing circuit, the power conversion circuit is connected to the voltage stabilizing circuit, the power conversion circuit is used for converting an AC power supply into a DC power supply, and the voltage stabilizing circuit includes Two-stage LDO regulators connected in series, the two-stage LDO regulators are used to perform two step-down processing on the DC power supply.

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 device in the embodiment of the present invention use two-stage LDO regulators connected in series to step down the power supply twice, so that the processed power supply can be supplied to the audio circuit, so that the obtained power supply has low noise.

Additional aspects and advantages of embodiments of the present invention will be set forth, in part, from the following description, and in part will become apparent from the following description, or may be learned by practice of the invention.

Description of drawings

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

FIG. 1 is a schematic diagram of functional modules of a power supply circuit according to an embodiment of the present invention.

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

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

4 is a circuit diagram of a second voltage stabilizer circuit according to the embodiment of the present invention.

Description of main components and symbols:

Power supply circuit 10, power conversion circuit 12, transformer 121, rectifier module 122, filter module 123, voltage regulator circuit 14, first voltage regulator circuit 142, first stage LDO regulator 1421, first filter module 1422, second filter Module 1423, first discharge module 1424, voltage regulation module 1425, interference absorption module 1426, third filter module 1427, first load 1428, second voltage regulator circuit 143, second stage LDO regulator 1431, fourth filter module 1432, the fifth filter module 1433, the second discharge module 1434, the sixth filter module 1435, and the second load 1436;

The first inductor L1, the second inductor L2, the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the first polarized capacitor CE1, and the second polarized capacitor CE2 and 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 ways

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, only used to explain the embodiments of the present invention, and should not be construed as limitations on the embodiments of the present invention.

Referring to FIG. 1 , a power supply 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 used to convert the AC power to the DC power. The voltage regulator circuit 14 includes two stages of LDO regulators connected in series. A two-stage LDO regulator is used to step down the DC power supply twice.

The power supply circuit 10 of the embodiment of the present invention uses the two-stage LDO regulators 141 connected in series to perform step-down processing on the power supply twice, and the processed power supply can be supplied to the audio circuit. In this way, the obtained power supply has low noise.

In some embodiments, the power conversion circuit 12 includes a transformer 121 , a rectifier module 122 and a filter module 123 which are connected in sequence. The primary end of the transformer 121 is used to connect the AC power source. The rectifier module 122 is used to convert the AC signal output by the secondary end of the transformer 121 into a DC signal. The filtering module 123 is used for filtering out the interference signal in the DC signal to obtain the DC power supply.

In one example, transformer 121 may be a toroidal transformer. Toroidal transformers have good output characteristics and anti-interference ability, high electrical efficiency and good heat dissipation, and can be widely used in various electrical equipment and other electronic equipment with high technical requirements.

In one example, the rectifier module 122 includes a silicon bridge circuit. The rectifier module 122 may adopt a full-wave rectifier circuit composed of a silicon bridge circuit. When the rectifier module 122 includes a silicon bridge circuit, two input ends of the silicon bridge circuit are connected to the secondary end of the transformer 121, one output end of the silicon bridge circuit is connected to the filter module 123 and the voltage regulator circuit 14, and the other end of the silicon bridge circuit is connected to the filter module 123 and the voltage regulator circuit 14 The output is grounded.

In one example, the filter module 123 includes a filter 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 rectifier 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 LDO voltage regulator 1421 . The second voltage regulator circuit 143 includes a second stage LDO voltage regulator 1431 . The first-stage LDO regulator 1421 is used for the first step-down processing of the DC power supply. The second-stage LDO regulator 1431 is used to perform a second step-down process on the DC power supply after the first step-down process.

Specifically, the first-stage LDO regulator 1421 and the second-stage LDO regulator 1431 form a series-connected two-stage LDO regulator. In an example, the output voltage of the power conversion circuit 12 may be 5V. After the first step-down processing is performed by the first-stage LDO regulator 1421 , the voltage drops to 3.3V, and then the second-stage LDO regulator 1431 passes the voltage. After the second step-down processing, the voltage is reduced to 1.2V, so that the generated power supply noise is low, which can be used to power the audio circuit and make the audio circuit have a higher standard audio index and sound quality. Of course, the voltage output by the power conversion circuit 12 may also be 12V or other voltages. In one example, both the first-stage LDO regulator 1421 and the second-stage LDO regulator 1431 can use LDO regulators with a model number of AZ1117CD.

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 regulation module 1425, an interference absorption module 1426, a third Filtering module 1427 and first load 1428. The first filter module 1422 is connected to the rectifier module 122 , the first discharge module 1424 , the first-stage LDO regulator 1421 and the second filter module 1423 . The first-stage LDO regulator 1421 is connected to the voltage regulation module 1425 , the third filter module 1427 , the first load 1428 and the second voltage regulator circuit 143 . The voltage regulation module 1425 is connected to the interference absorption module 1426 . The first filtering module 1422, the second filtering module 1423 and the third filtering module 1427 are used to filter out noise interference in the DC power supply. The first discharge module 1424 is used to rapidly discharge the first voltage regulator circuit 142 when the power circuit is unplugged. The voltage adjustment module 1425 is used to adjust the voltage value output by the first voltage regulator circuit 142 . The interference absorption module 1426 is used for absorbing interference signals in the first voltage regulator circuit 142 .

In this way, the first voltage regulator circuit 142 is used to implement the first step-down processing for the DC power supply.

In some embodiments, the first filter module 1422 includes a first inductor L1. One end of the first inductor L1 is connected to the rectifier module 122 . The other end of the first inductor L1 is connected to the first discharge module 1424 , the input end of the first stage LDO regulator 1421 and the second filter module 1423 .

Specifically, in the embodiment of the present invention, one end of the first inductor L1 serves as the input end of the first filter module 1422 , and the other end of the first inductor L1 serves as the output end of the first filter module 1422 . The first inductor L1 is used to filter out high frequency noise in the circuit.

In some embodiments, the second filter module 1423 includes a first capacitor C1. One end of the first capacitor C1 is connected to the input end of the first filter module 1422 , the first discharge module 1424 and the first stage LDO regulator 1421 . 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 serves as the input end of the second filter module 1423 , and the other end of the first capacitor C1 serves as the output end of the second filter module 1423 . The first capacitor C1 is used to provide a bypass path to ground for high frequency noise in the circuit.

In certain embodiments, the first discharge module 1424 includes a first diode D1. The cathode of the first diode D1 is connected to the first filter module 1422 , the input end of the first-stage LDO regulator 1421 and the second filter module 1423 . The anode of the first diode D1 is connected to the output end of the first-stage LDO regulator 1421 , the voltage adjustment module 1425 , the third filter module 1427 , the first load 1428 and the second voltage regulator circuit 143 .

Specifically, when the power supply circuit is unplugged, the power conversion circuit 12 does not supply power, the line load of the input terminal AVDD of the first voltage regulator circuit 142 is large and the power down quickly, while the output terminal AVDD1 of the first voltage regulator circuit 142 is powered down slowly. Therefore, the discharge of the output terminal AVDD1 of the first voltage regulator circuit 142 can be accelerated through 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 discharge module 1424 , the output end of the first stage LDO regulator 1421 , the third filter module 1427 , the first load 1428 and the second voltage regulator circuit 143 . The other end of the first resistor R1 is connected to the adjustment end of the first-stage LDO regulator 1421 , one end of the second resistor R2 and the interference absorption module 1426 . The other end of the second resistor R2 is grounded.

Specifically, in the embodiment of the present invention, one end of the first resistor R1 is used as the output end of the first voltage regulator circuit 142 . The voltage value output by the first voltage regulator circuit 142 is determined by the ratio of the first resistor R1 to the second resistor R2. In this way, by adjusting the ratio between the first resistor R1 and the second resistor R2, the voltage value of the output of the first voltage regulator circuit 142 can be adjusted.

In some embodiments, the interference absorption module 1426 includes a second capacitor C2. One end of the second capacitor C2 is connected to the voltage adjustment 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 voltage regulator circuit 142, so that the first voltage regulator circuit 142 can avoid self-oscillation due to being too sensitive.

In some embodiments, the third filter module 1427 includes a third capacitor C3 and a first polarized capacitor CE1, and one end of the third capacitor C3 is connected to the output end of the first discharge module 1424 and the first-stage LDO regulator 1421 , the voltage regulation module 1425, the positive pole of the first polar capacitor CE1, the first load 1428 and the second voltage regulator circuit 143, the other end of the third capacitor C3 is grounded, and the negative pole of the first polar capacitor CE1 is grounded.

Specifically, the third capacitor C3 is used to filter out high frequency noise in the circuit, while the first polar capacitor CE1 has a larger capacitance value and is used to filter out 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 discharge module 1424 , the output end of the first stage LDO regulator 1421 , the voltage adjustment module 1425 , the third filter module 1427 and the second voltage regulator circuit 143 . The other end of the third resistor R3 is grounded.

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 regulator circuit 143 further includes a fourth filter module 1432 , a fifth filter module 1433 , a second discharge module 1434 , a sixth filter module 1435 and a second load 1436 . The fourth filter module 1432 is connected to the first voltage regulator circuit 142 , the second discharge module 1434 , the second stage LDO voltage regulator 1431 and the fifth filter module 1433 . The second stage LDO regulator 1431 is connected to the sixth filter module 1435 and the second load 1436 . The fourth filtering module 1432, the fifth filtering module 1433 and the sixth filtering module 1435 are used to filter out noise interference in the DC power supply. The second discharge module 1434 is configured to rapidly discharge the second voltage regulator circuit 143 when the power circuit is unplugged.

In this way, the second voltage-stabilizing circuit 143 is used to implement the second step-down process on the DC power supply after the first step-down process.

In some embodiments, the fourth filter module 1432 includes a second inductor L2. One end of the second inductor L2 is connected to the first voltage regulator circuit 142 . The other end of the second inductor L2 is connected to the second discharge module 1434 , the input end of the second-stage LDO regulator 1431 and the fifth filter module 1433 .

Specifically, in the embodiment of the present invention, one end of the second inductor L2 serves as the input end of the fourth filter module 1432 , and the other end of the second inductor L2 serves as the output end of the fourth filter module 1432 . The second inductor L2 is used to filter out high frequency noise in the circuit.

In some embodiments, the fifth filter module 1433 includes a second polarized capacitor CE2 and a fourth capacitor C4. The positive pole of the second polar capacitor CE2 is connected to the fourth filter module 1432, the second discharge module 1434, the input end of the second stage LDO regulator 1431 and one end of the fourth capacitor C4. The negative electrode of the second polar capacitor CE2 is grounded. The other end of the fourth capacitor C4 is grounded.

Specifically, the fourth capacitor C4 is used to filter out high frequency noise in the circuit, and the second polarized capacitor CE2 is used to filter out low frequency noise in the circuit.

In certain embodiments, the second discharge module 1434 includes a second diode D2. The cathode of the second diode D2 is connected to the fourth filter module 1432 , the input end of the second-stage LDO regulator 1431 and the fifth filter module 1433 . The anode of the second diode D2 is connected to the output end of the second-stage LDO regulator 1431 , the sixth filtering module 1435 and the second load 1436 .

Specifically, when the power supply circuit is unplugged, the power conversion circuit 12 does not supply power, the line load of the input terminal AVDD1 of the second voltage stabilizing circuit 143 is large and the power is quickly turned off, while the output terminal of the second voltage stabilizing circuit 143 is powered down slowly. The discharge of the output terminal of the second voltage regulator circuit 143 can be accelerated by the second diode D2.

In some embodiments, the sixth filter module 1435 includes a fifth capacitor C5 and a third polarized capacitor CE3. One end of the fifth capacitor C5 is connected to the second discharge module 1434 , the output end of the second-stage LDO regulator 1431 , the positive electrode of the third polarized capacitor CE3 and the second load 1436 . The other end of the fifth capacitor C5 is grounded. The negative pole of the third polar capacitor CE3 is grounded.

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

In some embodiments, the second load 1436 includes a fourth resistor R4. One end of the fourth resistor R4 is connected to the second discharge module 1434 , the output end of the second-stage LDO regulator 1431 and the sixth filter module 1435 . The other end of the fourth resistor R4 is grounded.

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

It should be noted that, in the embodiment of the present invention, the adjustment terminal of the second-stage LDO 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-described embodiments.

The audio device in the embodiment of the present invention uses the two-stage LDO regulators 141 connected in series to perform two-stage step-down processing on the power supply, and the processed power supply can be provided to the audio circuit, so that the obtained power supply has low noise.

Specifically, the audio equipment can be, but is not limited to, audio equipment such as power amplifiers, speakers, multimedia consoles, digital mixers, audio sampling cards, synthesizers, mid-to-high frequency speakers, microphones, sound cards in PCs, headphones, and DVD playback devices. .

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

In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a It is a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection or can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two components or two components interaction relationship. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

The above disclosure provides many different embodiments or examples for implementing different structures of embodiments of the invention. In order to simplify the disclosure of the embodiments of the present invention, the components and arrangements of specific examples are described above. Of course, they are only examples and are not intended to limit the invention. Furthermore, embodiments of the present invention may repeat reference numerals and/or reference letters in different instances, such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and/or arrangements discussed . In addition, the embodiments of the present invention provide examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.

In the description of this specification, reference to description of the terms "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples", etc., is intended to incorporate the A particular feature, structure, material, or characteristic described by an embodiment or example is included in at least one embodiment or example of the present 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 description of a process or method in the flowcharts or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing a specified logical function or step of the process , and the scope of the preferred embodiments of the invention includes alternative implementations in which the functions may be performed out of the order shown or discussed, including performing the functions substantially concurrently or in the reverse order depending upon the functions involved, which should It is understood by those skilled in the art to which the embodiments of the present invention belong.

The logic and/or steps represented in flowcharts or otherwise described herein, for example, may be considered an ordered listing of executable instructions for implementing the logical functions, may be embodied in any computer-readable medium, For use by an instruction execution system, apparatus or apparatus (such as a computer-based system, a system including a processing module, or other system that can fetch instructions from and execute instructions from an instruction execution system, apparatus or apparatus), or in conjunction with such instruction execution system, apparatus or equipment. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport the program for use by or in connection with an instruction execution system, apparatus, or apparatus. More specific examples (non-exhaustive list) of computer readable media include the following: electrical connections with one or more wiring (electronic devices), portable computer disk cartridges (magnetic devices), random access memory (RAM), Read Only Memory (ROM), Erasable Editable Read Only Memory (EPROM or Flash Memory), Fiber Optic Devices, and Portable Compact Disc Read Only Memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program may be printed, as the paper or other medium may be optically scanned, for example, followed by editing, interpretation, or other suitable medium as necessary process to obtain the program electronically and then store it in computer memory.

It should be understood that various parts of the embodiments of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, 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, it can be implemented by any one or a combination of the following techniques known in the art: Discrete logic circuits, application specific integrated circuits with suitable combinational logic gates, Programmable Gate Arrays (PGA), Field Programmable Gate Arrays (FPGA), etc.

Those skilled in the art can understand that all or part of the steps carried by the methods of the above embodiments can be completed by instructing the relevant hardware through a program, and the program can be stored in a computer-readable storage medium, and the program can be stored in a computer-readable storage medium. When executed, one or a combination of the steps of the method embodiment is included.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing module, or each unit may exist physically alone, or two or more units may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules. If the integrated modules are implemented in the form of software functional modules and sold or used as independent products, they may also be stored in a computer-readable storage medium.

The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, and the like.

Although the embodiments of the present invention have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and should not be construed as limiting the present invention. Embodiments are subject to variations, modifications, substitutions and variations.

Claims (16)

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.

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