CN210225730U - Low-noise anti-interference digital power amplifier system - Google Patents
Low-noise anti-interference digital power amplifier system Download PDFInfo
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- CN210225730U CN210225730U CN201921520458.4U CN201921520458U CN210225730U CN 210225730 U CN210225730 U CN 210225730U CN 201921520458 U CN201921520458 U CN 201921520458U CN 210225730 U CN210225730 U CN 210225730U
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Abstract
The utility model discloses a low-noise anti-interference digital power amplifier system, which comprises a main control module, a digital power amplifier module and a stabilized voltage power supply module, wherein the main control module is connected with the digital power amplifier module, the main control module and the digital power amplifier module are both connected with the stabilized voltage power supply module, the cathode of a first diode and one end of a first resistor are both connected with the main control module, the anode of the first diode is connected with a working mode control pin of a power amplifier, an inverse audio input pin, a second capacitor, a fifth resistor and an adjusting pin of a slide rheostat are sequentially connected, one end of a third capacitor is connected between the second capacitor and the fifth resistor, a normal audio output pin and an inverse audio output pin of the power amplifier are both connected with a loudspeaker, a fourth capacitor and a fifth polarity capacitor are connected in parallel between a power input pin of the power amplifier and a reference ground, the noise in the digital power amplifier can be reduced, so that sound equipment can output high-quality audio signals.
Description
Technical Field
The utility model relates to a stereo set equipment production field, in particular to anti-interference digital power amplifier system of low noise.
Background
A power amplifier, commonly referred to as a "power amplifier," is an amplifier that produces maximum power output to drive a speaker given distortion; the power amplifier plays an important role in adjusting the organization in the whole sound system, but the traditional power amplifier at present generally has the problems of higher noise and poorer anti-interference capability, so that the high-quality audio output of sound equipment is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve one of the technical problem that exists among the prior art at least, provide a low noise anti-jamming digital power amplifier system, can improve anti-jamming ability with the noise reduction in the digital power amplifier for sound equipment can export high-quality audio signal.
The utility model provides a technical scheme that its problem adopted is:
the utility model provides an anti-interference digital power amplifier system of low noise, including host system, digital power amplifier module and constant voltage power supply module, host system with digital power amplifier module connects, host system with digital power amplifier module all with constant voltage power supply module connects, digital power amplifier module includes power amplifier, first diode, first resistance, fourth resistance, fifth resistance, first polarity electric capacity, second electric capacity, third electric capacity, fourth electric capacity, fifth polarity electric capacity, eighth electric capacity, first inductance, slide rheostat and loudspeaker, the negative pole of first diode with the one end of first resistance all with host system connects, the positive pole of first diode with power amplifier's mode control pin connects, power amplifier's normal phase audio frequency input pin fourth resistance, The eighth capacitor is connected with a reference ground in sequence, an inverse audio input pin of the power amplifier, the second capacitor, the fifth resistor and an adjusting pin of the slide rheostat are connected in sequence, one end of the third capacitor is connected between the second capacitor and the fifth resistor, the other end of the third capacitor is connected with the reference ground, a normal-phase audio output pin and an inverse-phase audio output pin of the power amplifier are both connected with the horn, one end of the first inductor is connected with a power input pin of the power amplifier, the other end of the first inductor is connected with the regulated power supply module, and a fourth capacitor and a fifth-polarity capacitor are connected between the power input pin of the power amplifier and the reference ground in parallel.
Further, the voltage-stabilized power supply module comprises a voltage reduction circuit and a voltage stabilizing circuit.
Further, the voltage reduction circuit comprises a second inductor, a second diode, a seventeenth capacitor, an eighteenth capacitor, a twentieth capacitor, a twenty-first capacitor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor and a voltage reduction chip, one end of the twenty-first capacitor and one end of the twentieth capacitor are both connected with an input pin of the voltage reduction chip, the other end of the twenty-first capacitor and the other end of the twentieth capacitor are both connected with a reference ground, a working frequency pin of the voltage reduction chip is connected with one end of the eleventh resistor, the other end of the eleventh resistor is connected with the reference ground, a nineteenth capacitor is connected between a self-voltage-lifting pin of the voltage reduction chip and a switch control pin of the voltage reduction chip, and a compensation pin, the eighteenth capacitor, the tenth resistor and the reference ground of the voltage reduction chip are sequentially connected, the negative electrode of the second diode and one end of the second inductor are connected with a switch control pin of the voltage reduction chip, the other end of the second inductor is connected with the seventeenth capacitor, one end of the eighth resistor and one end of the ninth resistor are connected with a feedback pin of the voltage reduction chip, and the other end of the eighth resistor and the other end of the ninth resistor are connected with the other end of the second inductor.
Further, the voltage stabilizing circuit comprises a twenty-second capacitor, a twenty-third capacitor, a third diode, a twenty-fourth capacitor, a twenty-fifth capacitor and a voltage stabilizing chip, wherein one end of the twenty-second capacitor, one end of the twenty-third capacitor and the negative electrode of the third diode are all connected with the other end of the second inductor, the other end of the second inductor is further connected with an input pin of the voltage stabilizing chip, one end of the twenty-fourth capacitor and one end of the twenty-fifth capacitor are all connected with an output pin of the voltage stabilizing chip, and the other end of the twenty-second capacitor, the other end of the twenty-third capacitor, the negative electrode of the third diode, the other end of the twenty-fourth capacitor, the other end of the twenty-fifth capacitor and the other end of the reference ground of the voltage stabilizing chip are all connected with a reference ground.
Further, the main control module comprises a single-chip microcomputer control chip, and the single-chip microcomputer control chip is connected with the negative electrode of the first diode.
Further, the power amplifier is NS 4150.
Further, the model of the voltage reduction chip is MP2565 DN.
Further, the model of the voltage stabilizing chip is LM 1117.
The utility model provides an embodiment has following beneficial effect at least: the voltage-stabilizing power supply module can supply power to the main control module and the digital power amplifier module, so that the whole digital power amplifier system can normally run; the main control module can send a control signal to the digital power amplifier module, so that the digital power amplifier module can perform response processing according to the control signal sent by the main control module; the first diode and the first resistor form a power amplifier mute circuit, so that impact generated during power-on can be well prevented; the fourth resistor, the eighth capacitor, the second capacitor, the fifth resistor and the third capacitor form a differential circuit, so that noise in the digital power amplifier can be well reduced; the fourth capacitor and the fifth capacitor are connected in parallel to form a filter circuit, and clutter in the digital power amplifier can be removed; the first inductor can well carry out current-limiting processing on a power supply, the condition of load short circuit is prevented, the digital power amplifier module has a good noise reduction function, and the anti-interference capacity is strong, so that the digital power amplifier system can output high-quality audio signals.
Drawings
The invention is further described with reference to the following figures and examples.
Fig. 1 is a schematic circuit block diagram of a low-noise anti-interference digital power amplifier system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a digital power amplifier module circuit of a low-noise anti-interference digital power amplifier system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a voltage reduction circuit of a low-noise anti-interference digital power amplifier system according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a voltage stabilizing circuit of a low-noise anti-interference digital power amplifier system according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a main control module of a low-noise anti-interference digital power amplifier system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
It should be noted that, if there is no conflict, various features in the embodiments of the present invention may be combined with each other, and all of them are within the scope of the present invention. Additionally, while functional block divisions are performed in apparatus schematics, with logical sequences shown in flowcharts, in some cases, steps shown or described may be performed in sequences other than block divisions in apparatus or flowcharts.
A power amplifier, commonly referred to as a "power amplifier," is an amplifier that produces maximum power output to drive a speaker given distortion; the power amplifier plays an important role in adjusting the organization in the whole sound system, but the traditional power amplifier at present generally has the problems of higher noise and poorer anti-interference capability, so that the high-quality audio output of sound equipment is influenced.
Based on this, the utility model provides a low noise anti-jamming digital power amplifier system can improve anti-jamming ability with the noise reduction in the digital power amplifier for sound equipment can export high-quality audio signal.
The embodiments of the present invention will be further explained with reference to the drawings.
Referring to fig. 1-2, an embodiment of the present invention provides a low-noise anti-interference digital power amplifier system, including a main control module 100, a digital power amplifier module 200 and a regulated power supply module 300, where the main control module 100 is connected to the digital power amplifier module 200, both the main control module 100 and the digital power amplifier module 200 are connected to the regulated power supply module 300, the digital power amplifier module 200 includes a power amplifier U2, a first diode D1, a first resistor R1, a fourth resistor R4, a fifth resistor R5, a first polar capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth polar capacitor C5, an eighth capacitor C8, a first inductor L1, a sliding rheostat Rp and a horn M, where a cathode of the first diode D1 and one end of the first resistor R1 are connected to the main control module 100, an anode of the first diode D1 is connected to a working mode control pin of the power amplifier U2, a positive phase audio input pin of the power amplifier U2, a fourth resistor R4, an eighth capacitor C8 and a reference ground are connected in sequence, a negative phase audio input pin of the power amplifier U2, a second capacitor C2, a fifth resistor R5 and an adjusting pin of the sliding rheostat Rp are connected in sequence, one end of a third capacitor C3 is connected between the second capacitor C2 and the fifth resistor R5, the other end of a third capacitor C3 is connected with the reference ground, the positive phase audio output pin and the negative phase audio output pin of the power amplifier U2 are both connected with the horn M, one end of a first inductor L1 is connected with a power supply input pin of the power amplifier U2, the other end of the first inductor L1 is connected with the regulated power supply module 300, and a fourth capacitor C4 and a fifth polarity capacitor C5 are connected between the power supply input pin of the power amplifier U2 and the reference ground in parallel. The voltage-stabilized power supply module 300 can supply power to the main control module 100 and the digital power amplifier module 200, so that the whole digital power amplifier system can normally operate; the main control module 100 can send a control signal to the digital power amplifier module 200, so that the digital power amplifier module 200 can perform response processing according to the control signal sent by the main control module 100; the first diode D1 and the first resistor R1 form a power amplifier mute circuit, so that impact generated during power-on can be well prevented; the fourth resistor R4, the eighth capacitor C8, the second capacitor 2, the fifth resistor R5 and the third capacitor C3 form a differential circuit, so that noise in the digital power amplifier can be well reduced; the fourth capacitor C4 and the fifth capacitor C5 are connected in parallel to form a filter circuit, and clutter in the digital power amplifier can be removed; the first inductor L1 can well perform current limiting processing on a power supply to prevent the occurrence of load short circuit, and the digital power amplifier module has a good noise reduction function and strong anti-interference capability, so that the digital power amplifier system can output high-quality audio signals; and the sliding rheostat Rp is utilized, the volume emitted by the loudspeaker M can be conveniently and quickly controlled, and the adjustment is simple and convenient.
Further, the regulated power supply module 300 includes a voltage reduction circuit and a voltage regulation circuit. The voltage reduction circuit can reduce the voltage, so that the reduced voltage can supply power to the corresponding component, and the corresponding component can work normally; the voltage stabilizing circuit enables voltage in the circuit to be stable, and components in the circuit can normally work for a long time.
The voltage reduction circuit comprises a second inductor C2, a second diode D1, a seventeenth capacitor C17, an eighteenth capacitor C18, a twentieth capacitor C20, a twenty-first capacitor C21, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11 and a voltage reduction chip U3, wherein one end of the twenty-first capacitor C21 and one end of the twentieth capacitor C20 are connected with an input pin of the voltage reduction chip U3, the other end of the twenty-first capacitor C21 and the other end of the twentieth capacitor C20 are connected with a reference ground, an operating frequency pin of the voltage reduction chip U3 is connected with one end of the eleventh resistor R11, the other end of the eleventh resistor R11 is connected with the reference ground, a nineteenth capacitor C19 is connected between a self-voltage lifting pin of the voltage reduction chip U3 and a switch control pin of the voltage reduction chip U3, a compensation pin of the voltage reduction chip U3, a eighteenth capacitor C8, a tenth capacitor C10 and a reference resistor R34 are sequentially connected with the, the negative electrode of the second diode D2 and one end of the second inductor L2 are both connected to a switch control pin of the buck chip U3, the other end of the second inductor L2 is connected to a seventeenth capacitor C17, one end of the eighth resistor R8 and one end of the ninth resistor R9 are both connected to a feedback pin of the buck chip U3, and the other end of the eighth resistor R8 and the other end of the ninth resistor R9 are both connected to the other end of the second inductor L2. By utilizing the voltage reduction chip U3, the voltage input by the input pin can be reduced for subsequent corresponding circuit components, so that the corresponding circuit components can normally run.
The voltage stabilizing circuit comprises a twenty-second capacitor C22, a twenty-third capacitor C23, a third diode D3, a twenty-fourth capacitor C24, a twenty-fifth capacitor C25 and a voltage stabilizing chip U4, wherein one end of the twenty-second capacitor C22, one end of the twenty-third capacitor C23 and the cathode of the third diode D3 are connected with the other end of a second inductor L2, the other end of the second inductor L2 is further connected with an input pin of the voltage stabilizing chip U4, one end of the twenty-fourth capacitor C24 and one end of the twenty-fifth capacitor C25 are both connected with an output pin of the voltage stabilizing chip U4, and the other end of the twenty-second capacitor C22, the other end of the twenty-third capacitor C23, the cathode of the third diode D3, the other end of the twenty-fourth capacitor C24, the twenty-fifth capacitor C25 and the other end of the reference ground of the voltage stabilizing chip U4 are all connected with a reference ground. The twenty-second capacitor C22 and the twenty-third capacitor C23 can perform filtering processing, and the third diode D3 can perform the function of well suppressing the impulse in the circuit; the voltage stabilizing chip U4 can further perform voltage reduction stabilizing processing on the voltage signal sent by the voltage reduction chip U3, and the twenty-fourth capacitor C24 and the twenty-fifth capacitor C25 can both perform further filtering processing, so that the voltage processed by the voltage stabilizing chip U4 is more stable.
The main control module 100 includes a single chip microcomputer control chip U1, and the single chip microcomputer control chip U1 is connected to the negative electrode of the first diode D1. The model of the singlechip control chip U1 is STM32, and the singlechip control chip U1 can send a control signal to the digital power amplifier module, so that the digital power amplifier module can make a corresponding response by using a more corresponding control signal.
The power amplifier U2 is NS 4150. NS4150 is an ultra-low EMI, 3W mono-channel audio power amplifier without filter, and it has built-in over-current protection, over-temperature protection and under-voltage protection functions, effectively protecting the chip from being damaged under abnormal working conditions. NS4150 also reduces external components, PCB area, and system cost by eliminating the need for a filter PWM modulation architecture and gain built-in approach.
Wherein, the voltage reduction chip U3 is MP2565 DN. The MP2565DN is a voltage stabilizing chip, has stable performance, can receive a wide voltage adjusting range, and can adjust the components around the chip to obtain corresponding voltage signals according to actual needs.
Wherein, the voltage stabilization chip U4 model is LM 1117. LM1117 is a low dropout voltage regulator, with a voltage difference of 1.2V output and a load current of 1.2V at 800 mA. LM1117 has the same pin arrangement. LM1117 has a voltage-adjustable version, and can realize an output voltage range of 1.25-1.38V through two external resistors.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention defined by the appended claims.
Claims (8)
1. The utility model provides a low noise anti-jamming digital power amplifier system which characterized in that: the digital power amplifier comprises a main control module, a digital power amplifier module and a stabilized voltage power supply module, wherein the main control module is connected with the digital power amplifier module, the main control module is connected with the stabilized voltage power supply module, the digital power amplifier module comprises a power amplifier, a first diode, a first resistor, a fourth resistor, a fifth resistor, a first polarity capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth polarity capacitor, an eighth capacitor, a first inductor, a sliding rheostat and a loudspeaker, the negative electrode of the first diode and one end of the first resistor are connected with the main control module, the positive electrode of the first diode is connected with a working mode control pin of the power amplifier, a positive phase audio input pin, a fourth resistor, the eighth capacitor and a reference ground of the power amplifier are sequentially connected, and a reverse phase audio input pin of the power amplifier, The second capacitor, the fifth resistor and the adjusting pin of the slide rheostat are sequentially connected, one end of the third capacitor is connected between the second capacitor and the fifth resistor, the other end of the third capacitor is connected with a reference ground, a normal-phase audio output pin and a reverse-phase audio output pin of the power amplifier are both connected with the horn, one end of the first inductor is connected with a power input pin of the power amplifier, the other end of the first inductor is connected with the stabilized voltage power supply module (300), and a fourth capacitor and a fifth-polarity capacitor are further connected between the power input pin of the power amplifier and the reference ground in parallel.
2. The low-noise anti-interference digital power amplifier system according to claim 1, wherein: the voltage-stabilized power supply module comprises a voltage reduction circuit and a voltage stabilizing circuit.
3. The low-noise anti-interference digital power amplifier system according to claim 2, wherein: the voltage reduction circuit comprises a second inductor, a second diode, a seventeenth capacitor, an eighteenth capacitor, a twentieth capacitor, a twenty-first capacitor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor and a voltage reduction chip, one end of the twenty-first capacitor and one end of the twentieth capacitor are connected with an input pin of the voltage reduction chip, the other end of the twenty-first capacitor and the other end of the twentieth capacitor are connected with a reference ground, a working frequency pin of the voltage reduction chip is connected with one end of the eleventh resistor, the other end of the eleventh resistor is connected with the reference ground, a nineteenth capacitor is connected between a self-boosting pin of the voltage reduction chip and a switch control pin of the voltage reduction chip, and a compensation pin, the eighteenth capacitor, the tenth resistor and the reference ground of the voltage reduction chip are sequentially connected, the negative electrode of the second diode and one end of the second inductor are connected with a switch control pin of the voltage reduction chip, the other end of the second inductor is connected with the seventeenth capacitor, one end of the eighth resistor and one end of the ninth resistor are connected with a feedback pin of the voltage reduction chip, and the other end of the eighth resistor and the other end of the ninth resistor are connected with the other end of the second inductor.
4. The low-noise anti-interference digital power amplifier system according to claim 3, wherein: the voltage stabilizing circuit comprises a twenty-second capacitor, a twenty-third capacitor, a third diode, a twenty-fourth capacitor, a twenty-fifth capacitor and a voltage stabilizing chip, one end of the twenty-second capacitor, one end of the twenty-third capacitor and the negative electrode of the third diode are connected with the other end of the second inductor, the other end of the second inductor is further connected with an input pin of the voltage stabilizing chip, one end of the twenty-fourth capacitor and one end of the twenty-fifth capacitor are connected with an output pin of the voltage stabilizing chip, and the other end of the twenty-second capacitor, the other end of the twenty-third capacitor, the negative electrode of the third diode, the other end of the twenty-fourth capacitor, the other end of the twenty-fifth capacitor and the other end of the reference ground end of the voltage stabilizing chip are connected with a reference ground.
5. The low-noise anti-interference digital power amplifier system according to claim 1, wherein: the main control module comprises a single-chip microcomputer control chip, and the single-chip microcomputer control chip is connected with the negative electrode of the first diode.
6. The low-noise anti-interference digital power amplifier system according to claim 1, wherein: the power amplifier is NS 4150.
7. The low-noise anti-interference digital power amplifier system according to claim 3, wherein: the model of the voltage reduction chip is MP2565 DN.
8. The low-noise anti-interference digital power amplifier system according to claim 4, wherein: the voltage stabilizing chip is LM1117 in model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921520458.4U CN210225730U (en) | 2019-09-12 | 2019-09-12 | Low-noise anti-interference digital power amplifier system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921520458.4U CN210225730U (en) | 2019-09-12 | 2019-09-12 | Low-noise anti-interference digital power amplifier system |
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| Publication Number | Publication Date |
|---|---|
| CN210225730U true CN210225730U (en) | 2020-03-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921520458.4U Active CN210225730U (en) | 2019-09-12 | 2019-09-12 | Low-noise anti-interference digital power amplifier system |
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| CN (1) | CN210225730U (en) |
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2019
- 2019-09-12 CN CN201921520458.4U patent/CN210225730U/en active Active
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