CN212381182U - Three-level power amplifying circuit system - Google Patents
Three-level power amplifying circuit system Download PDFInfo
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- CN212381182U CN212381182U CN202021846791.7U CN202021846791U CN212381182U CN 212381182 U CN212381182 U CN 212381182U CN 202021846791 U CN202021846791 U CN 202021846791U CN 212381182 U CN212381182 U CN 212381182U
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Abstract
The utility model discloses a tertiary power amplification circuit system, include: the power supply comprises a power supply module, a first primary power amplification circuit, a second primary power amplification circuit, a first secondary power amplification circuit, a second secondary power amplification circuit, a first tertiary power amplification circuit, a second tertiary power amplification circuit, a control module, a current detection module, a first single-pole double-throw switch, a second single-pole double-throw switch, a third single-pole double-throw switch, an input node and an output node. By arranging the first primary power amplification circuit, the second primary power amplification circuit, the first secondary power amplification circuit, the second secondary power amplification circuit, the first tertiary power amplification circuit and the second tertiary power amplification circuit, which power amplification circuit is put into is selected according to the output current of the power supply module obtained by the current detection module, so that the short-circuited power amplification circuit is avoided, and a flexible power amplification strategy is realized. The utility model discloses mainly used power amplifier technical field.
Description
Technical Field
The utility model relates to a power amplifier technical field, in particular to tertiary power amplification circuit system.
Background
A power amplifier (abbreviated as "power amplifier") is an amplifier that can generate maximum power output to drive a load (e.g., a speaker) under a given distortion ratio. The power amplifier plays a role of 'organization and coordination' in the whole sound system, and governs to some extent whether the whole system can provide good sound quality output.
The conventional power amplifier generally comprises three stages of amplifying circuits, namely a first-stage amplifying circuit, a second-stage amplifying circuit and a third-stage amplifying circuit, and the three stages of amplifying circuits are used for driving sound. However, since the three stages of amplifying circuits exist, there is a case where a short circuit occurs at a certain stage, and the entire sound drive is affected. Therefore, the industry needs to solve the problem of the sound drive blockage caused by the short circuit of one stage.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to a three-stage power amplifier circuit system, which solves one or more of the problems of the prior art and provides at least one of the advantages of the present invention.
The utility model provides a solution of its technical problem is: three stage power amplification circuitry, comprising: the power supply comprises a power supply module, a first primary power amplification circuit, a second primary power amplification circuit, a first secondary power amplification circuit, a second secondary power amplification circuit, a first tertiary power amplification circuit, a second tertiary power amplification circuit, a control module, a current detection module, a first single-pole double-throw switch, a second single-pole double-throw switch, a third single-pole double-throw switch, an input node and an output node; the power supply end of the power supply module is respectively connected with the movable end of a first single-pole double-throw switch, the movable end of a second single-pole double-throw switch and the movable end of a third single-pole double-throw switch, the first fixed end of the first single-pole double-throw switch is connected with the power supply end of a first primary power amplification circuit, and the second fixed end of the first single-pole double-throw switch is connected with the power supply end of a second primary power amplification circuit; the first fixed end of the second single-pole double-throw switch is connected with the power supply end of the first secondary power amplification circuit, and the second fixed end of the second single-pole double-throw switch is connected with the power supply end of the second secondary power amplification circuit; the first fixed end of the third single-pole double-throw switch is connected with the power supply end of the first three-level power amplification circuit, and the second fixed end of the third single-pole double-throw switch is connected with the power supply end of the second three-level power amplification circuit; the input end of the first primary power amplification circuit and the input end of the second primary power amplification circuit are both connected with an input node; the output end of the first primary power amplifying circuit is connected with the output end of the second primary power amplifying circuit, and the output end of the first primary power amplifying circuit is respectively connected with the input end of the first secondary power amplifying circuit and the input end of the second secondary power amplifying circuit; the output end of the first secondary power amplifying circuit is connected with the output end of the second secondary power amplifying circuit, and the output end of the first secondary power amplifying circuit is respectively connected with the input end of the first tertiary power amplifying circuit and the input end of the second tertiary power amplifying circuit; the output end of the first three-stage power amplification circuit and the output end of the second three-stage power amplification circuit are both connected with an output node; the control module is respectively connected with the control end of the first single-pole double-throw switch, the control end of the second single-pole double-throw switch and the control end of the third single-pole double-throw switch; the current detection module is used for detecting the output current of the power supply module, the control module controls the switching action of the first single-pole double-throw switch according to the output current, the control module controls the switching action of the second single-pole double-throw switch according to the output current, and the control module controls the switching action of the third single-pole double-throw switch according to the output current.
Furthermore, the three-stage power amplifier circuit system further comprises a first capacitor, wherein one end of the first capacitor is connected with the first fixed end of the first single-pole double-throw switch, and the other end of the first capacitor is connected with the second fixed end of the first single-pole double-throw switch. The characteristic that the voltage at two ends of the capacitor cannot change suddenly is utilized, so that the first fixed end and the second fixed end of the first single-pole double-throw switch are protected in the switching process of the first single-pole double-throw switch.
Furthermore, the three-stage power amplifier circuit system further comprises a second capacitor, wherein one end of the second capacitor is connected with the first fixed end of the second single-pole double-throw switch, and the other end of the second capacitor is connected with the second fixed end of the second single-pole double-throw switch. The characteristic that the voltage at two ends of the capacitor cannot change suddenly is utilized, so that the first fixed end and the second fixed end of the second single-pole double-throw switch are protected in the switching process of the second single-pole double-throw switch.
Furthermore, the three-level power amplifier circuit system further comprises a third capacitor, wherein one end of the third capacitor is connected with the first fixed end of the third single-pole double-throw switch, and the other end of the third capacitor is connected with the second fixed end of the third single-pole double-throw switch. By utilizing the characteristic that the voltage at two ends of the capacitor cannot change suddenly, the first fixed end and the second fixed end of the third single-pole double-throw switch are protected in the switching process of the third single-pole double-throw switch.
Further, the control module comprises a single chip microcomputer.
Further, the model of singlechip is 89C 51.
The utility model has the advantages that: by arranging the first primary power amplification circuit, the second primary power amplification circuit, the first secondary power amplification circuit, the second secondary power amplification circuit, the first tertiary power amplification circuit and the second tertiary power amplification circuit, which power amplification circuit is put into is selected according to the output current of the power supply module obtained by the current detection module, so that the short-circuited power amplification circuit is avoided, and a flexible power amplification strategy is realized.
Drawings
In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is clear that the described figures represent only some embodiments of the invention, not all embodiments, and that a person skilled in the art can also derive other designs and figures from these figures without inventive effort.
Fig. 1 is a system block diagram of a three-stage power amplification circuitry.
Detailed Description
The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive labor based on the embodiments of the present invention all belong to the protection scope of the present invention. In addition, all the coupling/connection relationships mentioned herein do not mean that the components are directly connected, but mean that a better coupling structure can be formed by adding or reducing coupling accessories according to specific implementation conditions. All technical characteristics in the invention can be interactively combined on the premise of not conflicting with each other.
Referring to fig. 1, a three-stage power amplification circuitry comprises: the power supply circuit comprises a power supply module 100, a first primary power amplification circuit 401, a second primary power amplification circuit 501, a first secondary power amplification circuit 402, a second secondary power amplification circuit 502, a first tertiary power amplification circuit 403, a second tertiary power amplification circuit 503, a control module 200, a current detection module 300, a first single-pole double-throw switch 110, a second single-pole double-throw switch 120, a third single-pole double-throw switch 130, an input node 400 and an output node 500.
The power supply end of the power supply module 100 is connected to the moving end of the first single-pole double-throw switch 110, the moving end of the second single-pole double-throw switch 120, and the moving end of the third single-pole double-throw switch 130, the first fixed end of the first single-pole double-throw switch 110 is connected to the power supply end of the first primary power amplification circuit 401, and the second fixed end of the first single-pole double-throw switch 110 is connected to the power supply end of the second primary power amplification circuit 501.
The first fixed end of the second single-pole double-throw switch 120 is connected with the power supply end of the first secondary power amplifying circuit 402, and the second fixed end of the second single-pole double-throw switch 120 is connected with the power supply end of the second secondary power amplifying circuit 502.
The first fixed end of the third single-pole double-throw switch 130 is connected with the power supply end of the first three-stage power amplification circuit 403, and the second fixed end of the third single-pole double-throw switch 130 is connected with the power supply end of the second three-stage power amplification circuit 503.
The input end of the first primary power amplification circuit 401 and the input end of the second primary power amplification circuit 501 are both connected to the input node 400.
The output end of the first primary power amplifying circuit 401 is connected with the output end of the second primary power amplifying circuit 501, and the output end of the first primary power amplifying circuit 401 is connected with the input end of the first secondary power amplifying circuit 402 and the input end of the second secondary power amplifying circuit 502 respectively.
The output end of the first secondary power amplifying circuit 402 is connected with the output end of the second secondary power amplifying circuit 502, and the output end of the first secondary power amplifying circuit 402 is connected with the input end of the first tertiary power amplifying circuit 403 and the input end of the second tertiary power amplifying circuit 503 respectively.
The output terminal of the first three-stage power amplifying circuit 403 and the output terminal of the second three-stage power amplifying circuit 503 are both connected to the output node 500.
The control module 200 is respectively connected to the control terminal of the first spdt switch 110, the control terminal of the second spdt switch 120, and the control terminal of the third spdt switch 130.
The current detection module 300 is configured to detect an output current of the power module 100, the control module 200 controls the first single-pole double-throw switch 110 to switch according to the output current, the control module 200 controls the second single-pole double-throw switch 120 to switch according to the output current, and the control module 200 controls the third single-pole double-throw switch 130 to switch according to the output current.
The design idea of the three-stage power amplifier circuit is that a first primary power amplification circuit 401, a second primary power amplification circuit 501, a first secondary power amplification circuit 402, a second secondary power amplification circuit 502, a first three-stage power amplification circuit 403 and a second three-stage power amplification circuit 503 are arranged, and which power amplification circuit is put into is selected according to the output current of the power module 100 obtained by the current detection module 300, so that the short-circuited power amplification circuit is avoided, and a flexible power amplification strategy is realized. The first primary power amplifying circuit 401, the first secondary power amplifying circuit 402 and the first tertiary power amplifying circuit 403 are main amplifying circuits, and the second primary power amplifying circuit 501, the second secondary power amplifying circuit 502 and the second tertiary power amplifying circuit 503 are backup amplifying circuits. When the power module operates normally, the control module 200 controls the first single-pole double-throw switch 110, the second single-pole double-throw switch 120, and the third single-pole double-throw switch 130, so that the first primary power amplifier circuit 401, the first secondary power amplifier circuit 402, and the first tertiary power amplifier circuit 403 are all connected to the power module 100, that is, the main amplifier circuit operates normally. The signal at the input node 400 is amplified by the main amplifier circuit and then output from the output node 500.
When the main amplification circuit has a short circuit, at this time, the power module 100 outputs a short-circuit current, and after the current detection module 300 detects the short-circuit current, the control module 200 sequentially controls the first single-pole double-throw switch 110, the second single-pole double-throw switch 120, and the third single-pole double-throw switch 130 to switch until the short-circuit current disappears. The short-circuit current refers to a large current output from the power module 100 due to a short circuit of the first primary power amplifying circuit 401, the first secondary power amplifying circuit 402, or the first tertiary power amplifying circuit 403.
For example: when the first primary power amplifying circuit 401 has a short circuit, the power module 100 outputs a short-circuit current, and the control module 200 controls the first single-pole double-throw switch 110 to switch, at this time, the first primary power amplifying circuit 401 is not charged, the short-circuit condition of the first primary power amplifying circuit 401 disappears, and the short-circuit current output by the power module 100 disappears. At this point, the control module 200 stops continuing to switch the second spdt switch 120 and the third spdt switch 130. At this time, the signal input to the node 400 is amplified by the second-stage power amplifying circuit 501, the first-second-stage power amplifying circuit 402, and the first-third-stage power amplifying circuit 403, and is output from the output node 500.
When there is a short circuit in the first secondary power amplifying circuit 402, the power module 100 outputs a short-circuit current. The control module 200 controls the first single-pole double-throw switch 110 to switch, and at this time, the first primary power amplifying circuit 401 is not electrified, but the short-circuit current does not disappear. The control module 200 continues to control the second single-pole double-throw switch 120 to switch, at this time, the first secondary power amplifying circuit 402 is not charged, the short-circuit condition of the first secondary power amplifying circuit 402 disappears, and the short-circuit current output by the power module 100 disappears. At this point, the control module 200 stops continuing to switch the third single pole double throw switch 130. At this time, the signal input to the node 400 is amplified by the second-stage power amplifying circuit 501, the second-stage power amplifying circuit 502, and the first-stage power amplifying circuit 403, and is output from the output node 500.
When the first three-stage power amplifying circuit 403 has a short circuit, the power module 100 outputs a short-circuit current. The control module 200 controls the first single-pole double-throw switch 110 to switch, and at this time, the first primary power amplifying circuit 401 is not electrified, but the short-circuit current does not disappear. The control module 200 continues to control the second spdt switch 120 to switch, and at this time, the first secondary power amplifying circuit 402 is not charged, but the short-circuit current does not disappear. The control module 200 continues to control the third single-pole double-throw switch 130 to switch, at this time, the first three-stage power amplification circuit 403 is not charged, the short-circuit condition of the first three-stage power amplification circuit 403 disappears, and the short-circuit current output by the power module 100 disappears. At this time, the signal input to the node 400 is amplified by the second primary power amplifying circuit 501, the second secondary power amplifying circuit 502, and the second tertiary power amplifying circuit 503, and is output from the output node 500.
According to the three-stage power amplifier circuit system, the second primary power amplifying circuit 501, the second secondary power amplifying circuit 502 and the second tertiary power amplifying circuit 503 are arranged as backup amplifying circuits, and which power amplifying circuit is selected to be used according to the output current of the power supply module 100 obtained by the current detection module 300, so that the short-circuited power amplifying circuit is avoided, and a flexible power amplifying strategy is realized.
In order to protect the first fixed terminal and the second fixed terminal of the first single-pole double-throw switch 110, in some preferred embodiments, a first capacitor 111 is further included in the three-stage power amplifier circuit system, one end of the first capacitor 111 is connected to the first fixed terminal of the first single-pole double-throw switch 110, and the other end of the first capacitor 111 is connected to the second fixed terminal of the first single-pole double-throw switch 110. By using the characteristic that the voltage between the two ends of the capacitor cannot change suddenly, the first fixed end and the second fixed end of the first single-pole double-throw switch 110 are protected in the switching process of the first single-pole double-throw switch 110.
In order to protect the first fixed terminal and the second fixed terminal of the second spdt switch 120, in some preferred embodiments, a second capacitor 121 is further included in the three-stage power amplifier circuit system, one terminal of the second capacitor 121 is connected to the first fixed terminal of the second spdt switch 120, and the other terminal of the second capacitor 121 is connected to the second fixed terminal of the second spdt switch 120. By using the characteristic that the voltage at the two ends of the capacitor cannot change suddenly, the first fixed end and the second fixed end of the second single-pole double-throw switch 120 are protected in the switching process of the second single-pole double-throw switch 120.
In order to protect the first fixed terminal and the second fixed terminal of the third spdt switch 130, in some preferred embodiments, a third capacitor 131 is further included in the three-stage power amplifier circuit system, one end of the third capacitor 131 is connected to the first fixed terminal of the third spdt switch 130, and the other end of the third capacitor 131 is connected to the second fixed terminal of the third spdt switch 130. By using the characteristic that the voltage at the two ends of the capacitor cannot change suddenly, the first fixed end and the second fixed end of the second single-pole double-throw switch 120 are protected in the switching process of the second single-pole double-throw switch 120.
In some embodiments, the control module 200 comprises a single-chip microcomputer. The type of the single chip microcomputer is 89C 51.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited to the details of the embodiments shown, but is capable of various modifications and changes without departing from the spirit of the invention.
Claims (6)
1. A three-stage power amplification circuitry, comprising: the method comprises the following steps: the power supply comprises a power supply module, a first primary power amplification circuit, a second primary power amplification circuit, a first secondary power amplification circuit, a second secondary power amplification circuit, a first tertiary power amplification circuit, a second tertiary power amplification circuit, a control module, a current detection module, a first single-pole double-throw switch, a second single-pole double-throw switch, a third single-pole double-throw switch, an input node and an output node; the power supply end of the power supply module is respectively connected with the movable end of a first single-pole double-throw switch, the movable end of a second single-pole double-throw switch and the movable end of a third single-pole double-throw switch, the first fixed end of the first single-pole double-throw switch is connected with the power supply end of a first primary power amplification circuit, and the second fixed end of the first single-pole double-throw switch is connected with the power supply end of a second primary power amplification circuit; the first fixed end of the second single-pole double-throw switch is connected with the power supply end of the first secondary power amplification circuit, and the second fixed end of the second single-pole double-throw switch is connected with the power supply end of the second secondary power amplification circuit; the first fixed end of the third single-pole double-throw switch is connected with the power supply end of the first three-level power amplification circuit, and the second fixed end of the third single-pole double-throw switch is connected with the power supply end of the second three-level power amplification circuit; the input end of the first primary power amplification circuit and the input end of the second primary power amplification circuit are both connected with an input node; the output end of the first primary power amplifying circuit is connected with the output end of the second primary power amplifying circuit, and the output end of the first primary power amplifying circuit is respectively connected with the input end of the first secondary power amplifying circuit and the input end of the second secondary power amplifying circuit; the output end of the first secondary power amplifying circuit is connected with the output end of the second secondary power amplifying circuit, and the output end of the first secondary power amplifying circuit is respectively connected with the input end of the first tertiary power amplifying circuit and the input end of the second tertiary power amplifying circuit; the output end of the first three-stage power amplification circuit and the output end of the second three-stage power amplification circuit are both connected with an output node; the control module is respectively connected with the control end of the first single-pole double-throw switch, the control end of the second single-pole double-throw switch and the control end of the third single-pole double-throw switch; the current detection module is used for detecting the output current of the power supply module, the control module controls the switching action of the first single-pole double-throw switch according to the output current, the control module controls the switching action of the second single-pole double-throw switch according to the output current, and the control module controls the switching action of the third single-pole double-throw switch according to the output current.
2. The three-stage power amplification circuitry of claim 1, wherein: the circuit further comprises a first capacitor, one end of the first capacitor is connected with the first fixed end of the first single-pole double-throw switch, and the other end of the first capacitor is connected with the second fixed end of the first single-pole double-throw switch.
3. The three-stage power amplification circuitry of claim 1, wherein: the circuit further comprises a second capacitor, one end of the second capacitor is connected with the first fixed end of the second single-pole double-throw switch, and the other end of the second capacitor is connected with the second fixed end of the second single-pole double-throw switch.
4. The three-stage power amplification circuitry of claim 1, wherein: the circuit further comprises a third capacitor, one end of the third capacitor is connected with the first fixed end of the third single-pole double-throw switch, and the other end of the third capacitor is connected with the second fixed end of the third single-pole double-throw switch.
5. The three-stage power amplification circuitry of claim 1, wherein: the control module comprises a single chip microcomputer.
6. The three-stage power amplification circuitry of claim 5, wherein: the model of the single chip microcomputer is 89C 51.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021846791.7U CN212381182U (en) | 2020-08-28 | 2020-08-28 | Three-level power amplifying circuit system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021846791.7U CN212381182U (en) | 2020-08-28 | 2020-08-28 | Three-level power amplifying circuit system |
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| Publication Number | Publication Date |
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| CN212381182U true CN212381182U (en) | 2021-01-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021846791.7U Active CN212381182U (en) | 2020-08-28 | 2020-08-28 | Three-level power amplifying circuit system |
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