A three-stage power amplifier circuit system

Abstract

The present invention discloses a three-stage power amplifier circuit system, comprising: a power module, a first-stage power amplifier circuit, a second-stage power amplifier circuit, a first-stage power amplifier circuit, a second-stage power amplifier circuit, a first-stage power amplifier circuit, a second-stage power amplifier circuit, a first-stage power amplifier circuit, a second-stage power amplifier 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 setting the first-stage power amplifier circuit, the second-stage power amplifier circuit, the first-stage power amplifier circuit, the second-stage power amplifier circuit, the first-stage power amplifier circuit, the second-stage power amplifier circuit, the first-stage power amplifier circuit, and the second-stage power amplifier circuit, which power amplifier circuit is selected to be put into use according to the output current of the power module obtained by the current detection module, thereby avoiding the short-circuited power amplifier circuit and realizing a flexible power amplification strategy. The present invention is mainly used in the technical field of power amplifiers.

Description

Technical Field

[0001] The present invention relates to the technical field of power amplifiers, and in particular to a three-stage power amplifier circuit system. Background Art

[0002] A power amplifier (English name: power amplifier), referred to as "power amplifier", refers to an amplifier that can generate maximum power output to drive a load (such as a speaker) under given distortion conditions. The power amplifier plays a pivotal role in "organization and coordination" in the entire audio system, and to some extent dominates whether the entire system can provide good sound quality output.

[0003] The existing conventional power amplifier is generally composed of three-stage amplifier circuits, namely, the first-stage amplifier circuit, the second-stage amplifier circuit and the third-stage amplifier circuit, which are used to drive the audio. However, due to the existence of the three-stage amplifier circuit, there will be a short circuit at one stage, which will affect the entire audio drive. Therefore, the industry urgently needs to solve the problem of audio drive being blocked due to a short circuit at one stage. Summary of the invention

[0004] The purpose of the present invention is to provide a three-stage power amplifier circuit system to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0005] The solution of the present invention to solve the technical problem is: a three-stage power amplifier circuit system, including: a power supply module, a first-stage power amplifier circuit, a second-stage power amplifier circuit, a first-stage power amplifier circuit, a second-stage power amplifier circuit, a first-stage power amplifier circuit, a second-stage power amplifier circuit, a first-stage power amplifier circuit, a second-stage power amplifier 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 to the moving end of the first single-pole double-throw switch, the moving end of the second single-pole double-throw switch, and the moving end of the third single-pole double-throw switch. The first fixed end of the first single-pole double-throw switch is connected to the power supply end of the first primary power amplifier circuit, and the second fixed end of the first single-pole double-throw switch is connected to the power supply end of the second primary power amplifier circuit; the first fixed end of the second single-pole double-throw switch is connected to the power supply end of the first secondary power amplifier circuit, and the second fixed end of the second single-pole double-throw switch is connected to the power supply end of the second secondary power amplifier circuit; the first fixed end of the third single-pole double-throw switch is connected to the power supply end of the first tertiary power amplifier circuit, and the second fixed end of the third single-pole double-throw switch is connected to the power supply end of the second tertiary power amplifier circuit; the first The input end of the first-stage power amplifier circuit and the input end of the second-stage power amplifier circuit are both connected to the input node; the output end of the first-stage power amplifier circuit is connected to the output end of the second-stage power amplifier circuit, and the output end of the first-stage power amplifier circuit is respectively connected to the input end of the first-stage power amplifier circuit and the input end of the second-stage power amplifier circuit; the output end of the first-stage power amplifier circuit is connected to the output end of the second-stage power amplifier circuit, and the output end of the first-stage power amplifier circuit is respectively connected to the input end of the first-stage power amplifier circuit and the input end of the second-stage power amplifier circuit; the output end of the first-stage power amplifier circuit and the output end of the second-stage power amplifier circuit are both connected to the output node; the control module is respectively connected to 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 to detect 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.

[0006] Furthermore, the three-stage power amplifier circuit system further includes a first capacitor, one end of which is connected to the first fixed end of the first single-pole double-throw switch, and the other end of which is connected to the second fixed end of the first single-pole double-throw switch. By utilizing the characteristic that the voltage at both ends of the capacitor cannot change suddenly, the first fixed end and the second fixed end of the first single-pole double-throw switch are protected during the switching process of the first single-pole double-throw switch.

[0007] Furthermore, the three-stage power amplifier circuit system further includes a second capacitor, one end of which is connected to the first fixed end of the second single-pole double-throw switch, and the other end of which is connected to the second fixed end of the second single-pole double-throw switch. By utilizing the characteristic that the voltage across the capacitor cannot change suddenly, the first fixed end and the second fixed end of the second single-pole double-throw switch are protected during the switching process of the second single-pole double-throw switch.

[0008] Furthermore, the three-stage power amplifier circuit system further includes a third capacitor, one end of the third capacitor is connected to the first fixed end of the third single-pole double-throw switch, and the other end of the third capacitor is connected to the second fixed end of the third single-pole double-throw switch. By utilizing the characteristic that the voltage at both 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 during the switching process of the third single-pole double-throw switch.

[0009] Furthermore, the control module includes a single chip microcomputer.

[0010] Furthermore, the model of the single chip microcomputer is 89C51.

[0011] The beneficial effects of the present invention are as follows: by setting a first-stage power amplifier circuit, a second-stage power amplifier circuit, a first-stage power amplifier circuit, a second-stage power amplifier circuit, a first-stage power amplifier circuit and a second-stage power amplifier circuit, by selecting which power amplifier circuit to put into use according to the output current of the power module obtained by the current detection module, the short-circuited power amplifier circuit is avoided, thereby realizing a flexible power amplification strategy. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for use in the description of the embodiments. Obviously, the drawings described are only part of the embodiments of the present invention, not all of the embodiments, and those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative work.

[0013] Figure 1 It is a system block diagram of a three-stage power amplifier circuit system. DETAILED DESCRIPTION

[0014] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the present invention. In addition, all the connection / connection relationships mentioned in the text do not refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the invention can be combined interchangeably without conflicting with each other.

[0015] refer to Figure 1 A three-stage power amplifier circuit system includes: a power module 100, a first first-stage power amplifier circuit 401, a second first-stage power amplifier circuit 501, a first second-stage power amplifier circuit 402, a second second-stage power amplifier circuit 502, a first third-stage power amplifier circuit 403, a second third-stage power amplifier 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.

[0016] The power supply end of the power supply module 100 is respectively 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 first-stage power amplifier 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 first-stage power amplifier circuit 501.

[0017] The first fixed end of the second SPDT switch 120 is connected to the power supply end of the first and second power amplifier circuits 402 , and the second fixed end of the second SPDT switch 120 is connected to the power supply end of the second and second power amplifier circuits 502 .

[0018] The first fixed end of the third single-pole double-throw switch 130 is connected to the power supply end of the first three-stage power amplifier circuit 403 , and the second fixed end of the third single-pole double-throw switch 130 is connected to the power supply end of the second three-stage power amplifier circuit 503 .

[0019] The input end of the first-stage power amplifier circuit 401 and the input end of the second-stage power amplifier circuit 501 are both connected to the input node 400 .

[0020] The output end of the first-stage power amplifier circuit 401 is connected to the output end of the second-stage power amplifier circuit 501, and the output end of the first-stage power amplifier circuit 401 is connected to the input end of the first-stage power amplifier circuit 402 and the input end of the second-stage power amplifier circuit 502 respectively.

[0021] The output end of the first two-stage power amplifier circuit 402 is connected to the output end of the second two-stage power amplifier circuit 502, and the output end of the first two-stage power amplifier circuit 402 is connected to the input end of the first three-stage power amplifier circuit 403 and the input end of the second three-stage power amplifier circuit 503 respectively.

[0022] The output end of the first three-stage power amplifier circuit 403 and the output end of the second three-stage power amplifier circuit 503 are both connected to the output node 500 .

[0023] The control module 200 is connected to the control end of the first single-pole double-throw switch 110 , the control end of the second single-pole double-throw switch 120 , and the control end of the third single-pole double-throw switch 130 , respectively.

[0024] The current detection module 300 is used to detect the output current of the power module 100, the control module 200 controls the switching action of the first single-pole double-throw switch 110 according to the output current, the control module 200 controls the switching action of the second single-pole double-throw switch 120 according to the output current, and the control module 200 controls the switching action of the third single-pole double-throw switch 130 according to the output current.

[0025] The design idea of ​​the three-stage power amplifier circuit is to set a first-stage power amplifier circuit 401, a second-stage power amplifier circuit 501, a first-stage power amplifier circuit 402, a second-stage power amplifier circuit 502, a first-stage power amplifier circuit 403, and a second-stage power amplifier circuit 503, and select which power amplifier circuit to put into use according to the output current of the power module 100 obtained by the current detection module 300, so as to avoid the short-circuited power amplifier circuit and realize a flexible power amplification strategy. Among them, the first-stage power amplifier circuit 401, the first-stage power amplifier circuit 402, and the first-stage power amplifier circuit 403 are main amplifier circuits, and the second-stage power amplifier circuit 501, the second-stage power amplifier circuit 502, and the second-stage power amplifier circuit 503 are backup amplifier circuits. During normal operation, 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-stage power amplifier circuit 401, the first-stage power amplifier circuit 402 and the first-stage power amplifier circuit 403 are all connected to the power module 100, that is, the main amplifier circuit amplifies normally. The signal of the input node 400 is amplified by the main amplifier circuit and then output from the output node 500.

[0026] When the main amplifier circuit is short-circuited, the output short-circuit current of the power module 100 is generated. 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 the large current output by the power module 100 caused by the short circuit of the first-stage power amplifier circuit 401, the first-stage power amplifier circuit 402 or the first-stage power amplifier circuit 403.

[0027] For example, when the first level power amplifier circuit 401 is short-circuited, 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 level power amplifier circuit 401 is not powered, the short-circuit condition of the first level power amplifier circuit 401 disappears, and the short-circuit current output by the power module 100 disappears. At this time, the control module 200 stops switching the second single-pole double-throw switch 120 and the third single-pole double-throw switch 130. At this time, the signal of the input node 400 is amplified by the second level power amplifier circuit 501, the first level power amplifier circuit 402, and the first level power amplifier circuit 403, and is output from the output node 500.

[0028] When the first and second power amplifier circuits 402 are short-circuited, the power module 100 outputs a short-circuit current. The control module 200 controls the first single-pole double-throw switch 110 to switch. At this time, the first and second power amplifier circuits 401 are not powered, 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 and second power amplifier circuits 402 are not powered, the short-circuit condition of the first and second power amplifier circuits 402 disappears, and the short-circuit current output by the power module 100 disappears. At this time, the control module 200 stops switching the third single-pole double-throw switch 130. At this time, the signal of the input node 400 is amplified by the second first-stage power amplifier circuit 501, the second second-stage power amplifier circuit 502 and the first third-stage power amplifier circuit 403, and is output from the output node 500.

[0029] When the first three-stage power amplifier circuit 403 is short-circuited, the power module 100 outputs a short-circuit current. The control module 200 controls the first single-pole double-throw switch 110 to switch. At this time, the first one-stage power amplifier circuit 401 is not powered, 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 two-stage power amplifier circuit 402 is not powered, 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 amplifier circuit 403 is not powered, the short circuit of the first three-stage power amplifier circuit 403 disappears, and the short-circuit current output by the power module 100 disappears. At this time, the signal of the input node 400 is amplified by the second one-stage power amplifier circuit 501, the second two-stage power amplifier circuit 502, and the second three-stage power amplifier circuit 503, and is output from the output node 500.

[0030] The three-stage power amplifier circuit system sets a second-stage power amplifier circuit 501, a second-stage power amplifier circuit 502 and a second-stage power amplifier circuit 503 as backup amplifier circuits, and selects which power amplifier circuit to input according to the output current of the power module 100 obtained by the current detection module 300, thereby avoiding the short-circuited power amplifier circuit and realizing a flexible power amplification strategy.

[0031] 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, the three-stage power amplifier circuit system further includes a first capacitor 111, 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 utilizing the characteristic that the voltage across the capacitor cannot change suddenly, the first fixed terminal and the second fixed terminal of the first single-pole double-throw switch 110 are protected during the switching process of the first single-pole double-throw switch 110.

[0032] In order to protect the first fixed terminal and the second fixed terminal of the second single-pole double-throw switch 120, in some preferred embodiments, the three-stage power amplifier circuit system further includes a second capacitor 121, one end of the second capacitor 121 is connected to the first fixed terminal of the second single-pole double-throw switch 120, and the other end of the second capacitor 121 is connected to the second fixed terminal of the second single-pole double-throw switch 120. By utilizing the characteristic that the voltage across the capacitor cannot change suddenly, the first fixed terminal and the second fixed terminal of the second single-pole double-throw switch 120 are protected during the switching process of the second single-pole double-throw switch 120.

[0033] In order to protect the first fixed terminal and the second fixed terminal of the third single-pole double-throw switch 130, in some preferred embodiments, the three-stage power amplifier circuit system further includes a third capacitor 131, one end of the third capacitor 131 is connected to the first fixed terminal of the third single-pole double-throw switch 130, and the other end of the third capacitor 131 is connected to the second fixed terminal of the third single-pole double-throw switch 130. By utilizing the characteristic that the voltage across the capacitor cannot change suddenly, the first fixed terminal and the second fixed terminal of the second single-pole double-throw switch 120 are protected during the switching process of the second single-pole double-throw switch 120.

[0034] In some embodiments, the control module 200 includes a single chip microcomputer, wherein the model of the single chip microcomputer is 89C51.

[0035] The preferred embodiments of the present invention are described in detail above, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A three-stage power amplifier circuit system, characterized in that: include: A power supply module, a first primary power amplifier circuit, a second primary power amplifier circuit, a first secondary power amplifier circuit, a second secondary power amplifier circuit, a first tertiary power amplifier circuit, a second tertiary power amplifier 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 to the moving end of the first single-pole double-throw switch, the moving end of the second single-pole double-throw switch, and the moving end of the third single-pole double-throw switch, and the first fixed end of the first single-pole double-throw switch is connected to the first primary power The first fixed end of the second single-pole double-throw switch is connected to the power supply end of the first and second-stage power amplifier circuit, and the second fixed end of the second single-pole double-throw switch is connected to the power supply end of the second and second-stage power amplifier circuit; the first fixed end of the third single-pole double-throw switch is connected to the power supply end of the first and third-stage power amplifier circuit, and the second fixed end of the third single-pole double-throw switch is connected to the power supply end of the second and third-stage power amplifier circuit; the input end of the first and second-stage power amplifier circuits are connected to the input end of the second and third-stage power amplifier circuits. The input ends of the first-stage power amplifier circuits are connected to the input node; the output end of the first-stage power amplifier circuit is connected to the output end of the second-stage power amplifier circuit, and the output end of the first-stage power amplifier circuit is respectively connected to the input end of the first-stage power amplifier circuit and the input end of the second-stage power amplifier circuit; the output end of the first-stage power amplifier circuit is connected to the output end of the second-stage power amplifier circuit, and the output end of the first-stage power amplifier circuit is respectively connected to the input end of the first-stage power amplifier circuit and the input end of the second-stage power amplifier circuit; the output end of the first-stage power amplifier circuit and the output end of the second-stage power amplifier circuit are both connected to the output node; the control module is respectively connected to 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 to detect 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; The three-stage power amplification circuit system further includes a first capacitor, one end of the first capacitor is connected to the first fixed end of the first single-pole double-throw switch, and the other end of the first capacitor is connected to the second fixed end of the first single-pole double-throw switch; The three-stage power amplifier circuit system also includes a second capacitor, one end of the second capacitor is connected to the first fixed end of the second single-pole double-throw switch, and the other end of the second capacitor is connected to the second fixed end of the second single-pole double-throw switch.

2. A three-stage power amplifier circuit system according to claim 1, characterized in that: It also includes a third capacitor, one end of which is connected to the first fixed end of the third single-pole double-throw switch, and the other end of which is connected to the second fixed end of the third single-pole double-throw switch.

3. The three-stage power amplifier circuit system according to claim 1, characterized in that: The control module includes a single chip microcomputer.

4. A three-stage power amplifier circuit system according to claim 3, characterized in that: The model of the single chip microcomputer is 89C51.

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