CN220653339U - Digital audio amplifying circuit - Google Patents
Digital audio amplifying circuit Download PDFInfo
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- CN220653339U CN220653339U CN202322291841.XU CN202322291841U CN220653339U CN 220653339 U CN220653339 U CN 220653339U CN 202322291841 U CN202322291841 U CN 202322291841U CN 220653339 U CN220653339 U CN 220653339U
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- 238000005070 sampling Methods 0.000 claims abstract description 55
- 230000003321 amplification Effects 0.000 claims abstract description 35
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 35
- 238000012544 monitoring process Methods 0.000 claims description 18
- 239000003990 capacitor Substances 0.000 claims description 3
- 230000005669 field effect Effects 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- 229910044991 metal oxide Inorganic materials 0.000 description 5
- 150000004706 metal oxides Chemical class 0.000 description 5
- 239000004065 semiconductor Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000005236 sound signal Effects 0.000 description 2
- 239000003985 ceramic capacitor Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
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Abstract
The utility model discloses a digital audio amplifying circuit, which comprises: the signal input circuit, signal sampling circuit, drive circuit, power amplification circuit and feedback circuit, wherein: the signal input circuit is connected with a signal input end, and the output end of the signal input circuit is connected with the signal sampling circuit; the output end of the signal sampling circuit is connected with the driving circuit; the output end of the driving circuit is connected with the signal feedback circuit; the output end of the power amplifying circuit is connected with the feedback circuit; one end of the feedback circuit is connected with the input end of the signal sampling, and the other end of the feedback circuit is connected with the output end of the power amplifying circuit. The digital audio amplifying circuit of the embodiment of the utility model ensures the safe and stable operation of the whole amplifying circuit and realizes efficient and reliable power amplification.
Description
Technical Field
The utility model relates to the technical field of electronics, in particular to a digital audio amplifying circuit.
Background
The traditional audio frequency amplifying circuit is mostly linear power amplifying, consumes larger power when amplifying signals, and has lower efficiency due to the structural characteristics of the linear power amplifying circuit, and has poorer working stability.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art, and provides a digital audio amplifying circuit which ensures the safe and stable operation of the whole amplifying circuit and realizes efficient and reliable power amplification.
The present utility model provides a digital audio amplifying circuit, comprising: the signal input circuit, signal sampling circuit, drive circuit, power amplification circuit and feedback circuit, wherein:
the signal input circuit is connected with a signal input end, and the output end of the signal input circuit is connected with the signal sampling circuit;
the input end of the signal sampling circuit is connected with the signal input circuit and the feedback circuit, and the output end of the signal sampling circuit is connected with the driving circuit;
the input end of the driving circuit is connected with the signal sampling circuit, and the output end of the driving circuit is connected with the signal feedback circuit;
the input end of the power amplification circuit is connected with the driving circuit, and the output end of the power amplification circuit is connected with the feedback circuit;
one end of the feedback circuit is connected with the input end of the signal sampling, and the other end of the feedback circuit is connected with the output end of the power amplifying circuit.
The signal input circuit includes: a protection monitoring circuit and an input operational amplifier;
the input end of the protection monitoring circuit is connected with the signal input end, and the output end of the protection monitoring circuit is connected with the signal sampling circuit; the input end of the input operational amplifier is connected with the signal output end, and the output end of the input operational amplifier is connected with the signal sampling circuit.
The signal sampling circuit comprises a sampling operational amplifier, a pulse square wave signal processing circuit, a register output, a first register operational amplifier and a second register operational amplifier, wherein:
the input end of the sampling operational amplifier is connected with the input operational amplifier and the feedback circuit, and the output end of the sampling operational amplifier is connected with the pulse square wave signal processing circuit;
the first input end of the pulse square wave signal processing circuit is connected with the sampling operational amplifier, the second input end of the pulse square wave signal processing circuit is connected with the protection monitoring circuit, the first output end of the pulse square wave signal processing circuit is connected with the protection monitoring circuit, and the second output end of the pulse square wave signal processing circuit is connected with the register output;
the output end of the register output is connected with a first register operational amplifier and a second register operational amplifier;
one end of the first register operational amplifier is connected with the register output, and the other end of the first register operational amplifier is connected with a driving circuit;
one end of the second register operational amplifier is connected with the register output, and the other end of the second register operational amplifier is connected with the driving circuit.
The driving circuit adopts an integrated circuit of EG2104S model.
The driving circuit adopts a half-bridge driving mode, the upper bridge arm and the lower bridge arm of the driving circuit are driven by complementary PWM, the upper bridge arm and the lower bridge arm are respectively connected with a driving resistor, and the middle connecting line is a half-bridge structure output point.
The power amplifying circuit adopts a half-bridge totem pole structure, and a signal output line is formed from a middle point.
The power amplification circuit comprises two driving resistors and a metal oxide semiconductor field effect transistor connected with each driving resistor, wherein the two metal oxide semiconductor field effect transistors form an output line, and the output line is connected with a half-bridge structure output point of the driving circuit.
An inductor is connected in series on the output line.
A capacitor and a resistor are arranged between the output line and the reference ground.
The power amplifying circuit adopts a bipolar power supply to supply power.
The digital audio amplifying circuit can digitally sample the analog audio signal, realize high-efficiency power amplification and restore and output the input signal, thereby realizing closed-loop control, realizing processing, sampling, driving generation, power amplification and feedback control of the input signal, ensuring safe and stable operation of the whole amplifying circuit, realizing high-efficiency and reliable power amplification.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a functional schematic of a digital audio amplification circuit in accordance with an embodiment of the present utility model;
FIG. 2 is a functional schematic of a digital sampling module in an embodiment of the present utility model;
fig. 3 is a schematic diagram of the structure of the power amplification output circuit in the embodiment of the utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Specifically, fig. 1 shows an overall functional schematic of a digital audio amplifying circuit in an embodiment of the present utility model, fig. 2 shows a functional schematic of a digital sampling module in an embodiment of the present utility model, and fig. 3 shows a structural schematic of a power amplifying output circuit in an embodiment of the present utility model, the digital audio amplifying circuit includes: the signal input circuit, signal sampling circuit, drive circuit, power amplification circuit and feedback circuit, wherein:
the signal input circuit is used for processing an input signal, the signal input circuit is connected with a signal input end, and the output end of the signal input circuit is connected with the signal sampling circuit;
the signal sampling circuit is used for sampling an input signal, the input end of the signal sampling circuit is connected with the signal input circuit and the feedback circuit, and the output end of the signal sampling circuit is connected with the driving circuit;
the driving circuit is used for driving the rear-stage power circuit, the input end of the driving circuit is connected with the signal sampling circuit, and the output end of the driving circuit is connected with the signal feedback circuit;
the power amplification circuit is used for performing power amplification processing on an input signal, the input end of the power amplification circuit is connected with the driving circuit, and the output end of the power amplification circuit is connected with the feedback circuit;
the feedback circuit is used for adjusting and balancing output signal stability and circuit protection, one end of the feedback circuit is connected with the input end of the signal sampling, and the other end of the feedback circuit is connected with the output end of the power amplifying circuit.
Specifically, the signal input circuit may process an input signal and provide input protection for the entire digital audio amplifying circuit and provide protection for a subsequent circuit in the digital audio amplifying circuit, and the signal input circuit includes: the protection monitoring circuit and the input operational amplifier OP, if the input signal exceeds the protection value, the protection monitoring circuit limits amplitude, namely the input signal is increased again, the power amplifying circuit can not increase power any more, and the protection circuit is overloaded; the input operational amplifier OP filters and processes the input signal and filters out non-audio noise inputted from the outside.
Specifically, the input end of the protection monitoring circuit is connected with a signal input end, and the output end of the protection monitoring circuit is connected with the signal sampling circuit; the input end of the input operational amplifier OP is connected with a signal output end, and the output end of the input operational amplifier OP is connected with the signal sampling circuit. The protection monitoring circuit may be an OPA2188AIDR model integrated circuit.
Specifically, the signal sampling circuit herein may perform high-rate sampling on an input signal to generate a pulse square wave signal regulated by the input signal, where the signal sampling circuit includes a sampling operational amplifier, a pulse square wave signal processing circuit, a register output, a first register operational amplifier and a second register operational amplifier, where the sampling operational amplifier compares with the input signal to generate a pulse square wave signal, and the pulse square wave signal enters the pulse square wave signal processing circuit to generate a PWM signal, and the PWM signal is output through the register, where: the input end of the sampling operational amplifier is connected with the input operational amplifier OP and the feedback circuit, and the output end of the sampling operational amplifier is connected with the pulse square wave signal processing circuit; the first input end of the pulse square wave signal processing circuit is connected with the sampling operational amplifier based on a buffer, the second input end of the pulse square wave signal processing circuit is connected with the protection monitoring circuit based on the buffer, the first output end of the pulse square wave signal processing circuit is connected with the protection monitoring circuit based on the buffer, and the second output end of the pulse square wave signal processing circuit is connected with a register output (namely a register output circuit and the like); the output end of the register output is connected with a first register operational amplifier and a second register operational amplifier; one end of the first register operational amplifier is connected with the register output, and the other end of the first register operational amplifier is connected with a driving circuit; one end of the second register operational amplifier is connected with the register output, and the other end of the second register operational amplifier is connected with the driving circuit.
Specifically, the driving circuit can drive and output the high-speed pulse square wave signal which is generated in the signal sampling circuit and regulated by the input signal, the driving circuit can adopt an integrated circuit of EG2104S type, the driving circuit adopts a half-bridge driving mode, upper and lower bridge arms are complementarily PWM driven, the upper and lower bridge arms are respectively provided with a driving resistor, and an intermediate connecting line is a half-bridge structure output point.
Specifically, the power amplification circuit adopts a half-bridge totem pole structure, an upper tube is conducted under PWM driving, a lower tube is closed, current is output to a load end from vdd to a midpoint through an inductor, when the upper tube is closed, the lower tube is conducted, the current is output from the load end to vss through the midpoint through the inductor, and a signal output line is formed from the midpoint. The power amplification circuit comprises two driving resistors, and a metal oxide semiconductor field effect transistor connected with each driving resistor, wherein the two metal oxide semiconductor field effect transistors form an output line, the output line is connected with a half-bridge structure output point of the driving circuit, an inductor is connected in series on the output line, a capacitor and a resistor are arranged between the output line and a reference ground, the power amplification circuit can adopt a bipolar power supply to supply power, vdd is a positive power supply, and vss is a negative power supply. The power amplification circuit forms a power amplification structure based on two metal oxide semiconductor field effect transistors, forms an output filtering structure based on inductance, capacitance and resistance, realizes high-efficiency power amplification based on the power amplification structure, and realizes the filtering of high-speed pulse square wave signals based on the output filtering structure.
Specifically, the feedback circuit is used for realizing feedback of an output signal, and the output signal and the reference signal vref enter the signal sampling circuit together through the feedback circuit so as to realize balance and protection of output midpoint voltage.
It should be noted that, the digital audio amplifying circuit may adopt a full-patch packaging element and a module, and the actual circuit is connected with the components through the board inter-stage, so as to realize better electromagnetic compatibility, two paths of power supplies vdd and vss, and the left and right sides are respectively provided with an MLCC ceramic capacitor with good high-frequency characteristics. The whole circuit structure of the digital audio amplifying circuit adopts a horizontal layout mode, and the heat dissipation structure is installed in the vertical direction of the power tube.
The digital audio amplifying circuit adopts a half-bridge totem pole structure and outputs based on midpoint filtering; the input signal is input into an operational amplifier OP through a protection monitoring circuit for filtering and processing, non-audio noise input from the outside is filtered, the non-audio noise is compared with a sampling operational amplifier to generate a pulse square wave signal, the pulse square wave signal enters a pulse square wave signal processing circuit to generate a PWM signal, the PWM signal is registered and output to a driving circuit, an upper pipe is conducted and a lower pipe is closed under the driving of the PWM signal, current is output to a load end from VDD to a middle point through an inductor, when the upper pipe is closed and the lower pipe is conducted, the current is conducted from the load end to the middle point through the inductor to VSS, and a feedback circuit completes the closed loop control of the circuit to realize the PWM amplification of the input signal.
The digital audio amplifying circuit can digitally sample the analog audio signal, realize high-efficiency power amplification and restore output of the input signal, thereby realizing closed-loop control, processing, sampling, driving generation, power amplification and feedback control of the input signal, realizing small circuit board layout high-frequency power loop area, ensuring safe and stable operation of the whole amplifying circuit, realizing high-efficiency and reliable power amplification.
While the foregoing has been described in some detail by way of illustration of the principles and embodiments of the utility model, specific examples have been set forth herein to provide a thorough understanding of the method and core concepts of the utility model; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present utility model, the present description should not be construed as limiting the present utility model in view of the above.
Claims (10)
1. A digital audio amplification circuit, the audio amplification circuit comprising: the signal input circuit, signal sampling circuit, drive circuit, power amplification circuit and feedback circuit, wherein:
the signal input circuit is connected with a signal input end, and the output end of the signal input circuit is connected with the signal sampling circuit;
the input end of the signal sampling circuit is connected with the signal input circuit and the feedback circuit, and the output end of the signal sampling circuit is connected with the driving circuit;
the input end of the driving circuit is connected with the signal sampling circuit, and the output end of the driving circuit is connected with the feedback circuit;
the input end of the power amplification circuit is connected with the driving circuit, and the output end of the power amplification circuit is connected with the feedback circuit;
one end of the feedback circuit is connected with the input end of the signal sampling, and the other end of the feedback circuit is connected with the output end of the power amplifying circuit.
2. The digital audio amplification circuit of claim 1, wherein the signal input circuit comprises: a protection monitoring circuit and an input operational amplifier;
the input end of the protection monitoring circuit is connected with the signal input end, and the output end of the protection monitoring circuit is connected with the signal sampling circuit; the input end of the input operational amplifier is connected with the signal output end, and the output end of the input operational amplifier is connected with the signal sampling circuit.
3. The digital audio amplification circuit of claim 2, wherein the signal sampling circuit comprises a sampling op-amp, a pulse square wave signal processing circuit, a registered output, a first registered op-amp, and a second registered op-amp, wherein:
the input end of the sampling operational amplifier is connected with the input operational amplifier and the feedback circuit, and the output end of the sampling operational amplifier is connected with the pulse square wave signal processing circuit;
the first input end of the pulse square wave signal processing circuit is connected with the sampling operational amplifier, the second input end of the pulse square wave signal processing circuit is connected with the protection monitoring circuit, the first output end of the pulse square wave signal processing circuit is connected with the protection monitoring circuit, and the second output end of the pulse square wave signal processing circuit is connected with the register output;
the output end of the register output is connected with a first register operational amplifier and a second register operational amplifier;
one end of the first register operational amplifier is connected with the register output, and the other end of the first register operational amplifier is connected with a driving circuit;
one end of the second register operational amplifier is connected with the register output, and the other end of the second register operational amplifier is connected with the driving circuit.
4. The digital audio amplifier circuit of claim 3, wherein the driver circuit is an integrated circuit of model EG 2104S.
5. The digital audio amplifier circuit according to claim 4, wherein the driving circuit adopts a half-bridge driving mode, upper and lower bridge arms of the driving circuit are complementarily PWM driven, each upper and lower bridge arm is connected with a driving resistor, and the intermediate connecting line is a half-bridge structure output point.
6. The digital audio amplifier circuit of claim 5, wherein the power amplifier circuit is of a half-bridge totem pole configuration with signal output lines formed from midpoints.
7. The digital audio amplifier circuit of claim 6, wherein the power amplifier circuit comprises two drive resistors and one mosfet connected to each drive resistor, the two mosfets forming an output line connected to a half-bridge output point of the drive circuit.
8. The digital audio amplifier circuit of claim 7, wherein an inductor is connected in series with the output line.
9. The digital audio amplifier circuit of claim 8, wherein a capacitor and a resistor are provided between the output line and a reference ground.
10. A digital audio amplifying circuit according to any of claims 1 to 9, wherein the power amplifying circuit is powered by a bipolar power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322291841.XU CN220653339U (en) | 2023-08-24 | 2023-08-24 | Digital audio amplifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322291841.XU CN220653339U (en) | 2023-08-24 | 2023-08-24 | Digital audio amplifying circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220653339U true CN220653339U (en) | 2024-03-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322291841.XU Active CN220653339U (en) | 2023-08-24 | 2023-08-24 | Digital audio amplifying circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220653339U (en) |
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2023
- 2023-08-24 CN CN202322291841.XU patent/CN220653339U/en active Active
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