CN204362002U - A kind of digital audio frequency power amplifier - Google Patents
A kind of digital audio frequency power amplifier Download PDFInfo
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- CN204362002U CN204362002U CN201520052511.8U CN201520052511U CN204362002U CN 204362002 U CN204362002 U CN 204362002U CN 201520052511 U CN201520052511 U CN 201520052511U CN 204362002 U CN204362002 U CN 204362002U
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Abstract
A kind of digital audio frequency power amplifier, relate to audio-frequency power amplifier technical field, its circuit comprises triangular wave generator, comparator, drive circuit, switch power output circuit and low pass filter, two inputs of described comparator connect the output of audio signal and described triangular wave generator respectively, the input of drive circuit described in the output termination of described comparator, the input of switch power output circuit described in the output termination of described drive circuit, the input of low pass filter described in the output termination of described switch power output circuit, described triangular wave generator comprises squarer and integrating circuit, the linearity can be formed very well and very stable triangular wave, make the output of digital audio frequency power amplifier more stable.
Description
Technical field
The utility model relates to audio-frequency power amplifier technical field, particularly relates to a kind of digital audio frequency power amplifier.
Background technology
Power amplifier is divided into five classes according to its operating state usually.I.e. category-A, AB class, category-B, C class, D class.In audio frequency power amplifier field, front four classes all can directly adopt simulated audio signal directly to input, after amplification by this signal in order to promote loud speaker sounding.Class-D amplifier is more special, and it only has two states, be not logical is exactly break.Therefore, it directly can not input simulated audio signal, but amplifies after needing certain conversion again.People have the amplification of " switch " mode this kind, are called " digital amplifier ".
The triangular wave general linear degree of the digital audio amplifier of prior art is bad, and unstable, makes the output of digital audio amplifier also unstable.
Summary of the invention
The purpose of this utility model is avoid weak point of the prior art and provide a kind of digital audio frequency power amplifier, this digital audio frequency power amplifier can form the linearity very well and very stable triangular wave, make digital audio frequency power amplifier output more stable.
The purpose of this utility model is achieved through the following technical solutions:
A kind of digital audio frequency power amplifier is provided, comprise triangular wave generator, comparator, drive circuit, switch power output circuit and low pass filter, two inputs of described comparator connect the output of the audio signal after amplifying and described triangular wave generator respectively, the input of drive circuit described in the output termination of described comparator, the input of switch power output circuit described in the output termination of described drive circuit, the input of low pass filter described in the output termination of described switch power output circuit;
Described triangular wave generator comprises squarer and integrating circuit;
Described squarer comprises the chip U2A that resistance R5, electric capacity CM and model are 40106BD, and between the input that described resistance R5 is connected to described chip U2A and output, it is between input and ground that described electric capacity CM is connected to described chip U2A;
Described integrating circuit comprises electric capacity CN, electric capacity C3, electric capacity C4, resistance R1 to 4 and model are the chip U1A of LM393N, the output of described chip U2A connects the negative input end of chip U1A through electric capacity CN and resistance R2, between the negative input end being connected to described chip U1A after described electric capacity C4 and resistance R1 parallel connection and output, described resistance R3 and resistance R4 is connected between power supply VCC and ground after connecting, contact described in the positive input termination of described chip U1A between resistance R3 and resistance R4 and one end of electric capacity C3, the other end ground connection of electric capacity C3, contact between resistance R3 and resistance R4 is triangular wave output.
Described low pass filter comprises inductance L 1, inductance L 2, electric capacity C1 and electric capacity C2, described inductance L 1 and inductance L 2 are connected, the output of switch power output circuit described in one termination of inductance L 1, one end of inductance L 2 is output, electric capacity C1 is connected between contact between described inductance L 1 and inductance L 2 and ground, and electric capacity C2 is connected between described output and ground.
Described power supply VCC is produced by power circuit, described power circuit comprises rectifier bridge DZ, electric capacity C1, electric capacity C2, electric capacity C3, diode D2 and model are the chip U3 of L7805CV, the input termination civil power of described rectifier bridge DZ, 1 pin of the output chip termination U3 of described rectifier bridge and ground, the negative pole of described diode D2 connects 1 pin of chip U3, the positive pole of diode D2 connects 3 pin of chip U3, electric capacity C1 and electric capacity C2 is all connected between 1 pin of chip U3 and ground, the 2 pin ground connection of chip U3, electric capacity C3 is connected between 3 pin of chip U3 and ground, 3 pin of chip U3 are out-put supply VCC.
Described electric capacity CM comprises electric capacity C5 and electric capacity C6, and electric capacity C5 and electric capacity C6 is in parallel.
The value of described electric capacity C5 and electric capacity C6 is 10nF.
Described electric capacity CN comprises electric capacity C1 and electric capacity C2, and electric capacity C1 and electric capacity C2 connects.
The value of electric capacity C1 and electric capacity C2 is 22 μ F.
The value of electric capacity C3 and electric capacity C4 is 100nF, and the value of resistance R1 is 150k Ω, and the value of resistance R2 is 10 k Ω, and the value of resistance R3 and resistance R4 is 1 k Ω, and the value of resistance R5 is 1.68k Ω.
The value of described inductance L 1 is 22 μ H, and the value of the value of inductance L 2 to be the value of 47 μ H, electric capacity C1 be 1 μ F, electric capacity C2 is 0.68 μ F.
The value of the value of described electric capacity C1 to be the value of 470 μ F, electric capacity C2 be 1 μ F, electric capacity C3 is the model of 100 μ F, diode D2 is IN4007.
The beneficial effects of the utility model: circuit of the present utility model comprises triangular wave generator, comparator, drive circuit, switch power output circuit and low pass filter, two inputs of described comparator connect the output of audio signal and described triangular wave generator respectively, the input of drive circuit described in the output termination of described comparator, the input of switch power output circuit described in the output termination of described drive circuit, the input of low pass filter described in the output termination of described switch power output circuit, described triangular wave generator comprises squarer and integrating circuit, described squarer comprises resistance R5, electric capacity CM and model are the chip U2A of 40106BD, between the input that described resistance R5 is connected to described chip U2A and output, it is between input and ground that described electric capacity CM is connected to described chip U2A, electric capacity CM comprises electric capacity C5 and electric capacity C6, electric capacity C5 and electric capacity C6 is in parallel, described integrating circuit comprises electric capacity CN, electric capacity C3, electric capacity C4, resistance R1 to 4 and model are the chip U1A of LM393N, the output of described chip U2A connects the negative input end of chip U1A through electric capacity CN and resistance R2, between the negative input end being connected to described chip U1A after described electric capacity C4 and resistance R1 parallel connection and output, described resistance R3 and resistance R4 is connected between power supply VCC and ground after connecting, contact described in the positive input termination of described chip U1A between resistance R3 and resistance R4 and one end of electric capacity C3, the other end ground connection of electric capacity C3, contact between resistance R3 and resistance R4 is triangular wave output, described electric capacity CN comprises electric capacity C1 and electric capacity C2, electric capacity C1 and electric capacity C2 connects.
The triangular wave generator of digital audio frequency power amplifier of the present utility model, the chip U2A being 40106BD by utilizing model, a satisfactory triangular wave of frequency can be produced, but this triangular wave linearity when amplifying is very poor, shape picture is sinusoidal wave, and it is very unstable, a stable square wave can be produced by the value increasing resistance R1, recycling model is the integrating circuit that the chip U1A of LM393N forms, this stable square wave can be changed into triangular wave, the linearity of the triangular wave of such formation very well and very stable, make digital audio frequency power amplifier output more stable.
Accompanying drawing explanation
Accompanying drawing is utilized to be described further utility model, but the embodiment in accompanying drawing does not form any restriction of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the following drawings.
Fig. 1 is the circuit block diagram of a kind of digital audio frequency power amplifier of the present utility model.
Fig. 2 is the circuit diagram of the triangular wave generator of a kind of digital audio frequency power amplifier of the present utility model.
Fig. 3 is the circuit diagram of the low pass filter of a kind of digital audio frequency power amplifier of the present utility model.
Fig. 4 is the circuit diagram of the power circuit of a kind of digital audio frequency power amplifier of the present utility model.
Embodiment
With the following Examples the utility model is further described.
A kind of digital audio frequency power amplifier of the present embodiment, as shown in Figure 1, comprise triangular wave generator, comparator, drive circuit, switch power output circuit and low pass filter, two inputs of described comparator connect the output of audio signal and described triangular wave generator respectively, the input of drive circuit described in the output termination of described comparator, the input of switch power output circuit described in the output termination of described drive circuit, the input of low pass filter described in the output termination of described switch power output circuit.
As shown in Figure 2, described triangular wave generator comprises squarer and integrating circuit, described squarer comprises the chip U2A that resistance R5, electric capacity CM and model are 40106BD, between the input that described resistance R5 is connected to described chip U2A and output, it is between input and ground that described electric capacity CM is connected to described chip U2A, electric capacity CM comprises electric capacity C5 and electric capacity C6, and electric capacity C5 and electric capacity C6 is in parallel, described integrating circuit comprises electric capacity CN, electric capacity C3, electric capacity C4, resistance R1 to 4 and model are the chip U1A of LM393N, the output of described chip U2A connects the negative input end of chip U1A through electric capacity CN and resistance R2, between the negative input end being connected to described chip U1A after described electric capacity C4 and resistance R1 parallel connection and output, described resistance R3 and resistance R4 is connected between power supply VCC and ground after connecting, contact described in the positive input termination of described chip U1A between resistance R3 and resistance R4 and one end of electric capacity C3, the other end ground connection of electric capacity C3, contact between resistance R3 and resistance R4 is triangular wave output, described electric capacity CN comprises electric capacity C1 and electric capacity C2, electric capacity C1 and electric capacity C2 connects.
The triangular wave generator of the digital audio frequency power amplifier of the present embodiment, the chip U2A being 40106BD by utilizing model, a satisfactory triangular wave of frequency can be produced, but this triangular wave linearity when amplifying is very poor, shape picture is sinusoidal wave, and it is very unstable, a stable square wave can be produced by the value increasing resistance R1, recycling model is the integrating circuit that the chip U1A of LM393N forms, this stable square wave can be changed into triangular wave, the linearity of the triangular wave of such formation very well and very stable, make digital audio frequency power amplifier output more stable.
Concrete, when the value of resistance R1 select be 50 Ω time, the linearity of the triangular wave of generation is very poor and unstable, when the value of resistance R1 is selected as 1.68k Ω, can produce stable square wave.
Concrete, as shown in Figure 3, described low pass filter comprises inductance L 1, inductance L 2, electric capacity C1 and electric capacity C2, described inductance L 1 and inductance L 2 are connected, the output of switch power output circuit described in one termination of inductance L 1, one end of inductance L 2 is output, and electric capacity C1 is connected between contact between described inductance L 1 and inductance L 2 and ground, and electric capacity C2 is connected between described output and ground.Described low pass filter is 4 rank Butterworth low pass filters, and by selecting suitable element, the value of inductance L 1 is 22 μ H, the value of the value of inductance L 2 to be the value of 47 μ H, electric capacity C1 be 1 μ F, electric capacity C2 is 0.68 μ F, the upper limiting frequency of 20 kHz can be ensured, and passband inner curve substantially flat.
Concrete, as shown in Figure 4, described power supply VCC is produced by power circuit, described power circuit comprises rectifier bridge DZ, electric capacity C1, electric capacity C2, electric capacity C3, diode D2 and model are the chip U3 of L7805CV, the input termination civil power of described rectifier bridge DZ, 1 pin of the output chip termination U3 of described rectifier bridge and ground, the negative pole of described diode D2 connects 1 pin of chip U3, the positive pole of diode D2 connects 3 pin of chip U3, electric capacity C1 and electric capacity C2 is all connected between 1 pin of chip U3 and ground, the 2 pin ground connection of chip U3, electric capacity C3 is connected between 3 pin of chip U3 and ground, 3 pin of chip U3 are out-put supply VCC.The power supply VCC that power circuit exports is 5 volts, and employing model is the voltage that the chip U3 of L7805CV directly can obtain 5 volts, and make circuit simple, cost is low.
The value of described electric capacity C5 and electric capacity C6 is 10nF.
The value of described electric capacity C1 and electric capacity C2 is 22 μ F.
The value of described electric capacity C3 and electric capacity C4 is 100nF, and the value of resistance R1 is 150k Ω, and the value of resistance R2 is 10 k Ω, and the value of resistance R3 and resistance R4 is 1 k Ω, and the value of resistance R5 is 1.68k Ω.
The value of the value of described electric capacity C1 to be the value of 470 μ F, electric capacity C2 be 1 μ F, electric capacity C3 is the model of 100 μ F, diode D2 is IN4007.
Finally should be noted that; above embodiment is only in order to illustrate the technical solution of the utility model; but not the restriction to the utility model protection range; although done to explain to the utility model with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify to the technical solution of the utility model or equivalent replacement, and not depart from essence and the scope of technical solutions of the utility model.
Claims (10)
1. a digital audio frequency power amplifier, it is characterized in that: comprise triangular wave generator, comparator, drive circuit, switch power output circuit and low pass filter, two inputs of described comparator connect the output of the audio signal after amplifying and described triangular wave generator respectively, the input of drive circuit described in the output termination of described comparator, the input of switch power output circuit described in the output termination of described drive circuit, the input of low pass filter described in the output termination of described switch power output circuit;
Described triangular wave generator comprises squarer and integrating circuit;
Described squarer comprises the chip U2A that resistance R5, electric capacity CM and model are 40106BD, and between the input that described resistance R5 is connected to described chip U2A and output, it is between input and ground that described electric capacity CM is connected to described chip U2A;
Described integrating circuit comprises electric capacity CN, electric capacity C3, electric capacity C4, resistance R1 to 4 and model are the chip U1A of LM393N, the output of described chip U2A connects the negative input end of chip U1A through electric capacity CN and resistance R2, between the negative input end being connected to described chip U1A after described electric capacity C4 and resistance R1 parallel connection and output, described resistance R3 and resistance R4 is connected between power supply VCC and ground after connecting, contact described in the positive input termination of described chip U1A between resistance R3 and resistance R4 and one end of electric capacity C3, the other end ground connection of electric capacity C3, contact between resistance R3 and resistance R4 is triangular wave output.
2. a kind of digital audio frequency power amplifier as claimed in claim 1, it is characterized in that: described low pass filter comprises inductance L 1, inductance L 2, electric capacity C1 and electric capacity C2, described inductance L 1 and inductance L 2 are connected, the output of switch power output circuit described in one termination of inductance L 1, one end of inductance L 2 is output, electric capacity C1 is connected between contact between described inductance L 1 and inductance L 2 and ground, and electric capacity C2 is connected between described output and ground.
3. a kind of digital audio frequency power amplifier as claimed in claim 1, it is characterized in that: described power supply VCC is produced by power circuit, described power circuit comprises rectifier bridge DZ, electric capacity C1, electric capacity C2, electric capacity C3, diode D2 and model are the chip U3 of L7805CV, the input termination civil power of described rectifier bridge DZ, 1 pin of the output chip termination U3 of described rectifier bridge and ground, the negative pole of described diode D2 connects 1 pin of chip U3, the positive pole of diode D2 connects 3 pin of chip U3, electric capacity C1 and electric capacity C2 is all connected between 1 pin of chip U3 and ground, the 2 pin ground connection of chip U3, electric capacity C3 is connected between 3 pin of chip U3 and ground, 3 pin of chip U3 are out-put supply VCC.
4. a kind of digital audio frequency power amplifier as claimed in claim 1, is characterized in that: described electric capacity CM comprises electric capacity C5 and electric capacity C6, and electric capacity C5 and electric capacity C6 is in parallel.
5. a kind of digital audio frequency power amplifier as claimed in claim 4, is characterized in that: the value of described electric capacity C5 and electric capacity C6 is 10nF.
6. a kind of digital audio frequency power amplifier as claimed in claim 1, is characterized in that: described electric capacity CN comprises electric capacity C1 and electric capacity C2, and electric capacity C1 and electric capacity C2 connects.
7. a kind of digital audio frequency power amplifier as claimed in claim 6, is characterized in that: the value of electric capacity C1 and electric capacity C2 is 22 μ F.
8. a kind of digital audio frequency power amplifier as claimed in claim 1, it is characterized in that: the value of electric capacity C3 and electric capacity C4 is 100nF, the value of resistance R1 is 150k Ω, and the value of resistance R2 is 10 k Ω, the value of resistance R3 and resistance R4 is 1 k Ω, and the value of resistance R5 is 1.68k Ω.
9. a kind of digital audio frequency power amplifier as claimed in claim 2, is characterized in that: the value of described inductance L 1 is 22 μ H, and the value of the value of inductance L 2 to be the value of 47 μ H, electric capacity C1 be 1 μ F, electric capacity C2 is 0.68 μ F.
10. a kind of digital audio frequency power amplifier as claimed in claim 3, is characterized in that: the value of the value of described electric capacity C1 to be the value of 470 μ F, electric capacity C2 be 1 μ F, electric capacity C3 is the model of 100 μ F, diode D2 is IN4007.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520052511.8U CN204362002U (en) | 2015-01-26 | 2015-01-26 | A kind of digital audio frequency power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520052511.8U CN204362002U (en) | 2015-01-26 | 2015-01-26 | A kind of digital audio frequency power amplifier |
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| Publication Number | Publication Date |
|---|---|
| CN204362002U true CN204362002U (en) | 2015-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520052511.8U Expired - Fee Related CN204362002U (en) | 2015-01-26 | 2015-01-26 | A kind of digital audio frequency power amplifier |
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| Country | Link |
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| CN (1) | CN204362002U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106301260A (en) * | 2016-08-17 | 2017-01-04 | 黎明职业大学 | A kind of D-type audio power amplifier and drive circuit control circuit thereof |
| CN110244623A (en) * | 2019-06-19 | 2019-09-17 | 深圳市捷美瑞科技有限公司 | Medical examination and monitoring instrument, circuit and its control chip |
-
2015
- 2015-01-26 CN CN201520052511.8U patent/CN204362002U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106301260A (en) * | 2016-08-17 | 2017-01-04 | 黎明职业大学 | A kind of D-type audio power amplifier and drive circuit control circuit thereof |
| CN106301260B (en) * | 2016-08-17 | 2018-10-19 | 黎明职业大学 | A kind of D-type audio power amplifier and its driving circuit control circuit |
| CN110244623A (en) * | 2019-06-19 | 2019-09-17 | 深圳市捷美瑞科技有限公司 | Medical examination and monitoring instrument, circuit and its control chip |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150527 Termination date: 20210126 |