Distortion detection circuit, module and device

Abstract

The utility model is applied to the technical field of audios, and discloses a distortion detection circuit, module and device, the distortion detection circuit is connected with a control module, the distortion detection circuit comprises a detection module, the detection module is used for being connected with one or more power amplifier output ends, and the detection module is connected with the control module. When it is detected that the power amplifier output voltage of the power amplifier output end is larger than the preset output voltage, a driving signal is output in an isolated mode; and the driving module is connected with the detection module, and the driving module is used for receiving the driving signal and outputting a distortion signal of the driving signal, so that the control module adjusts a power amplifier based on the distortion signal. Therefore, the technical problem of how to reduce the distortion detection cost of the power amplifier is solved.

Description

Technical Field

[0001] The present application relates to the field of audio technology, and in particular to a distortion detection circuit, module and device. Background Art

[0002] With the development of technology, the power amplifier, as an important part of the audio system, is responsible for amplifying weak electrical signals and converting them into powerful audio currents to drive the speakers. At present, when the output power of the power amplifier is large, it is easy to be distorted. If it is in a distorted state for a long time, it will cause the amplifier to be damaged.

[0003] Therefore, it is necessary to detect the distortion state of the power amplifier and adjust the output of the power amplifier in time when the distortion of the power amplifier is detected. The distortion detection method in traditional technology is based on chip detection, which leads to high cost of distortion detection. Utility Model Content

[0004] The main purpose of the present application is to provide a distortion detection circuit, module and device, aiming to solve the technical problem of how to reduce the distortion detection cost of a power amplifier.

[0005] To achieve the above object, the present application provides a distortion detection circuit, the distortion detection circuit is connected to a control module, and the distortion detection circuit includes:

[0006] A detection module, the detection module is used to connect to at least one power amplifier output terminal, and isolate the output drive signal when detecting that the power amplifier output voltage of the power amplifier output terminal is greater than a preset output voltage;

[0007] A driving module, the driving module is connected to the detection module, and is used to receive the driving signal and output a distortion signal of the driving signal, so that the control module can adjust the power amplifier based on the distortion signal.

[0008] Optionally, the detection module includes:

[0009] A detection unit, wherein a first end of the detection unit is used to connect to at least one power amplifier output end, and when the detection unit detects that the power amplifier output voltage of the power amplifier output end is greater than a preset output voltage, a second end of the detection unit outputs a driving signal;

[0010] An isolation unit, wherein a first end of the isolation unit is connected to a second end of the detection unit, and a second end of the isolation unit is connected to the driving module, for receiving the driving signal and isolating and outputting the driving signal to the driving module.

[0011] Optionally, the detection module further includes:

[0012] At least one protection unit, a first end of the protection unit is used to connect to the output end of the power amplifier, and a second end of the protection unit is connected to the detection unit.

[0013] Optionally, the detection unit includes:

[0014] A first resistor, wherein a first end of the first resistor is used to connect to an output end of the power amplifier;

[0015] A first triode, wherein a base of the first triode is connected to a second end of the first resistor;

[0016] a second resistor, wherein a first end of the second resistor is connected to a base of the first transistor,

[0017] a third resistor, wherein a first end of the third resistor is connected to a second end of the second resistor, and a second end of the third resistor is connected to an emitter of the first transistor;

[0018] a fourth resistor, wherein a first end of the fourth resistor is connected to the emitter of the first transistor, and a second end of the fourth resistor is connected to the power supply terminal of the power amplifier;

[0019] a fifth resistor, wherein a first end of the fifth resistor is connected to the emitter of the first transistor, and a second end of the fifth resistor is grounded;

[0020] A sixth resistor, wherein a first end of the sixth resistor is connected to the collector of the first transistor, and a second end of the sixth resistor is connected to the power supply end of the power amplifier.

[0021] Optionally, the isolation unit includes:

[0022] a second triode, wherein the base of the second triode is connected to the collector of the first triode;

[0023] a seventh resistor, wherein a first end of the seventh resistor is connected to a second end of the sixth resistor, and a second end of the seventh resistor is connected to an emitter of the second transistor;

[0024] an eighth resistor, a first end of the eighth resistor being connected to the collector of the second transistor;

[0025] A ninth resistor, wherein a first end of the ninth resistor is connected to the second end of the eighth resistor, and a second end of the ninth resistor is grounded.

[0026] Optionally, the driving module includes:

[0027] a third triode, wherein the base of the third triode is connected to the second end of the eighth resistor, and the emitter of the third triode is grounded;

[0028] a tenth resistor, wherein a first end of the tenth resistor is connected to the collector of the third transistor, and a second end of the tenth resistor is connected to a preset reference voltage;

[0029] an eleventh resistor, a first end of the eleventh resistor being connected to the first end of the tenth resistor, and a second end of the eleventh resistor being used for outputting a distorted signal;

[0030] A twelfth resistor, wherein a first end of the twelfth resistor is connected to the second end of the tenth resistor, and a second end of the twelfth resistor is connected to the second end of the eleventh resistor.

[0031] Optionally, the driving module includes:

[0032] A capacitor, a first end of the capacitor is connected to the second end of the eleventh resistor, and a second end of the capacitor is grounded.

[0033] Optionally, the protection unit includes:

[0034] A thirteenth resistor, a first end of the thirteenth resistor is used to connect to the output end of the power amplifier;

[0035] A diode, a first end of the diode is connected to the second end of the thirteenth resistor, and a second end of the diode is connected to the first end of the first resistor.

[0036] In addition, to achieve the above-mentioned purpose, the present application provides a distortion detection module, which includes the distortion detection circuit as described above.

[0037] In addition, to achieve the above-mentioned purpose, the present application provides a distortion detection device, which includes the distortion detection module as described above.

[0038] The present application provides a distortion detection circuit, which is connected to a control module, and the distortion detection circuit includes: a detection module, which is used to access one or more power amplifier output terminals, and isolate the output drive signal when detecting that the power amplifier output voltage of the power amplifier output terminal is greater than the preset output voltage; a drive module, which is connected to the detection module, and is used to receive the drive signal and output a distortion signal of the drive signal for adjusting the power amplifier based on the distortion signal. The present application outputs a distortion signal when detecting that the power amplifier output voltage of the power amplifier output terminal is greater than the preset output voltage, so that the control module adjusts the gain of the power amplifier based on the distortion signal, thereby achieving the effect of protecting the power amplifier. Compared with the traditional chip-based detection, the present application performs detection through the detection module and the drive module, and does not use chip detection, thereby greatly reducing the cost of distortion detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic diagram of the structure of a distortion detection circuit provided in an embodiment of the present application;

[0040] Figure 2 A detailed structural diagram of a control module in a distortion detection circuit provided in an embodiment of the present application;

[0041] Figure 3 A detailed structural diagram of a control module in a distortion detection circuit provided in another embodiment of the present application;

[0042] Figure 4 A detailed structural diagram of a control module in a distortion detection circuit provided in another embodiment of the present application;

[0043] Figure 5 A detailed structural diagram of a distortion detection circuit provided in an embodiment of the present application.

[0044] Description of Figure Numbers:

[0045] Label name Label name 10 Detection module 20 Driver module 11 Detection unit 12 Isolation unit 13 Protection unit D1 diode R1-R13 1st - 13th resistor Q1-Q4 First-third transistor C1 capacitance

[0046] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0047] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0049] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0050] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] In addition, in this application, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0052] With the development of science and technology, the power amplifier, as an important part of the audio system, is responsible for amplifying weak electrical signals and converting them into powerful audio currents to drive the speakers. At present, the power amplifier is prone to distortion when the output power is large, and the amplifier will be damaged if it is in a distorted state for a long time. Therefore, it is necessary to detect the distortion state of the power amplifier and adjust the output of the power amplifier in time when the distortion is detected. The distortion in traditional technology is detected based on chips, which leads to high cost of detecting distortion.

[0053] Based on this, the present application proposes a distortion detection circuit, module and device, wherein the distortion detection circuit includes: a detection module and a driving module. The present application outputs a distortion signal when it detects that the output voltage of the power amplifier at the output end of the power amplifier is greater than a preset output voltage, so as to adjust and control the gain of the power amplifier based on the distortion signal, thereby achieving the effect of protecting the power amplifier. Compared with the traditional chip-based detection, the present application performs detection through a detection module and a driving module, and does not use chip detection, thereby greatly reducing the cost of distortion detection.

[0054] The present application provides a distortion detection circuit, referring to Figure 1 , Figure 1 This is a structural diagram of a distortion detection circuit provided in an embodiment of the present application. The distortion detection circuit is connected to a control module, and the distortion detection circuit includes:

[0055] A detection module 10, the detection module 10 is used to connect to at least one power amplifier output terminal A, and isolate the output drive signal when it is detected that the power amplifier output voltage of the power amplifier output terminal A is greater than a preset output voltage;

[0056] The driving module 20 is connected to the detection module 10 and is used to receive the driving signal and output a distortion signal of the driving signal so that the control module can adjust the power amplifier based on the distortion signal.

[0057] In this embodiment, the detection module 10 is connected to the power amplifier output terminal A, the detection module 10 collects the voltage of the power amplifier output terminal, and detects whether the voltage of the power amplifier output terminal is greater than a preset output voltage, wherein the preset output voltage is provided based on the internal circuit of the detection module 10, and when it is detected that the power amplifier output voltage of the power amplifier output terminal is greater than the preset output voltage, the output drive signal is isolated, and the drive signal can specifically be a high level and a low level. The drive module 20 is respectively connected to the detection module 10 and the control module, and the control module is a module for controlling the gain of the power amplifier, which can be a DSP (Digital Signal Processing, digital signal processing chip) or an MCU (Microcontroller Unit, micro control unit). The drive module 20 receives the drive signal and outputs a distortion signal of the drive signal. After receiving the distortion signal, the control module can reduce the gain of the power amplifier, thereby protecting the power amplifier. Compared with the traditional chip-based detection, the present application performs detection through the detection module and the drive module, and does not use chip detection, thereby greatly reducing the cost of distortion detection. At the same time, compared with the existing MCU which has no detection function, the present application can realize the function of distortion detection, thereby being able to respond to distortion situations in a timely manner.

[0058] It should be noted that the output end of the power amplifier is specifically the output end of the speaker, and the distorted signal is specifically the clipping signal sent to the control module.

[0059] Exemplarily, the detection module 10 may be connected to one or more power amplifier output terminals A, such as Figure 1As shown, if the detection module 10 is connected to a power amplifier output terminal A, when the detection module 10 detects that the power amplifier output voltage of the power amplifier output terminal A is greater than the preset output voltage, the drive signal is isolated and output, the drive module 20 sends out the distorted signal of the drive signal, and the control module adjusts the gain of the power amplifier based on the distorted signal. If the detection module 10 is connected to multiple power amplifier output terminals A, namely, power amplifier output terminals A-1, A-2...An, when the detection module 10 detects that the voltage of any power amplifier output terminal among the multiple power amplifier output terminals A is higher than the preset output voltage, the drive signal is isolated and output, the drive module 20 sends out the distorted signal of the drive signal, and the control module adjusts the gain of the power amplifier based on the distorted signal. Therefore, it can be used to detect whether a power amplifier output terminal is in a distorted phenomenon, and it can also be used to detect whether multiple power amplifier output terminals A are in a distorted phenomenon at the same time, thereby improving the application capability.

[0060] Optionally, in some feasible embodiments, reference Figure 2 , Figure 2 This is a detailed structural diagram of a control module in a distortion detection circuit provided in an embodiment of the present application. The detection module 10 includes:

[0061] A detection unit 11, wherein a first end of the detection unit 11 is used to connect to at least one power amplifier output terminal A, and when the detection unit 11 detects that the power amplifier output voltage of the power amplifier output terminal A is greater than a preset output voltage, a second end of the detection unit 11 outputs a driving signal;

[0062] The isolation unit 12 has a first end connected to the second end of the detection unit 11 and a second end connected to the driving module 20 for receiving the driving signal and isolating and outputting the driving signal to the driving module 20.

[0063] In this embodiment, the detection unit 11 detects whether the output voltage of the power amplifier at the power amplifier output terminal A is greater than the preset output voltage. When it is detected that the output voltage of the power amplifier is greater than the preset output voltage, a driving signal is output. After receiving the driving signal, the isolation unit 12 isolates the driving signal and sends it to the driving module 20. It should be noted that the detection unit 11 is powered by the power amplifier, and the driving module 20 is powered by the control module. Since the voltage of the power amplifier is higher than the voltage of the control module, the driving signal sent by the detection unit 11 needs to be isolated from the distorted signal sent to the control module.

[0064] Optionally, in some feasible embodiments, reference Figure 3 and Figure 4 , Figure 3 This is a detailed structural diagram of a control module in a distortion detection circuit provided in another embodiment of the present application, Figure 4This is a detailed structural diagram of a control module in a distortion detection circuit provided in another embodiment of the present application, wherein the detection module 10 further includes:

[0065] At least one protection unit 13 , wherein a first end of the protection unit 13 is used to be connected to an output end of a power amplifier, and a second end of the protection unit 13 is connected to the detection unit 11 .

[0066] For example, Figure 3 As shown, when detecting an output terminal of a power amplifier, the control module 10 includes a protection unit 13, and the protection unit 13 protects the output terminal of the power amplifier, such as Figure 4 As described above, if multiple power amplifier output terminals are detected, the control module 10 includes multiple protection units, namely 13-1, 13-2, ..., 13-n, and the power amplifier output terminal A-1 is protected by the protection unit 13-1, and the power amplifier output terminal A-2 is protected by the protection unit 13-2, and so on. The protection unit 13 plays a role in preventing current backflow.

[0067] Optionally, in some feasible embodiments, reference Figure 5 , Figure 5 This is a detailed structural diagram of a distortion detection circuit provided in an embodiment of the present application, wherein the detection unit 11 includes:

[0068] A first resistor R1, wherein a first end of the first resistor R1 is used to connect to an output end of a power amplifier;

[0069] A first transistor Q1, wherein a base of the first transistor Q1 is connected to a second end of the first resistor R1;

[0070] a second resistor R2, wherein a first end of the second resistor R2 is connected to a base of the first transistor Q1,

[0071] a third resistor R3, wherein a first end of the third resistor R3 is connected to a second end of the second resistor R2, and a second end of the third resistor R3 is connected to an emitter of the first transistor Q1;

[0072] a fourth resistor R4, wherein a first end of the fourth resistor R4 is connected to the emitter of the first transistor Q1, and a second end of the fourth resistor R4 is connected to the power supply terminal PVDD of the power amplifier;

[0073] a fifth resistor R5, wherein a first end of the fifth resistor R5 is connected to the emitter of the first transistor Q1, and a second end of the fifth resistor R5 is grounded;

[0074] A sixth resistor R6, wherein a first end of the sixth resistor R6 is connected to the collector of the first transistor Q1, and a second end of the sixth resistor R6 is connected to the power supply terminal PVDD of the power amplifier.

[0075] In this embodiment, the voltage V in the preset distortion state is obtained by dividing the voltage by the fourth resistor R4 and the fifth resistor R5. clip , if the voltage between the base and emitter of the first transistor Q1 is V be , the voltage at the power output end is greater than V clip +V be When the first transistor Q1 is turned on, the preset output voltage is V clip +V be , after the first transistor Q1 is turned on, the collector voltage of the first transistor Q1 is pulled down. If the voltage at the power output end is less than or equal to V clip +V be When , the first transistor Q1 is turned off.

[0076] It should be noted that the first resistor R1 , the second resistor R2 and the third resistor R3 function as voltage-dividing resistors.

[0077] For example, if the voltage between the base and the emitter of the first transistor Q1 is 0.6V at room temperature, the voltage at the power output end is greater than V clip +0.6V, the first transistor Q1 is turned on. The voltage at the power output end is less than or equal to V clip When the voltage is +0.6V, the first transistor Q1 is cut off.

[0078] Optionally, in some feasible embodiments, reference Figure 5 , the isolation unit 12 includes:

[0079] A second transistor Q2, wherein the base of the second transistor Q2 is connected to the collector of the first transistor Q1;

[0080] a seventh resistor R7, wherein a first end of the seventh resistor R7 is connected to a second end of the sixth resistor R6, and a second end of the seventh resistor R7 is connected to an emitter of the second transistor Q2;

[0081] an eighth resistor R8, a first end of the eighth resistor R8 being connected to the collector of the second transistor Q2;

[0082] A ninth resistor R9, wherein a first end of the ninth resistor R9 is connected to the second end of the eighth resistor R8, and a second end of the ninth resistor R9 is grounded.

[0083] In this embodiment, if the power amplifier is not distorted, the first transistor Q1 is not turned on, and the voltage of the base of the second transistor Q2 is greater than the voltage of the emitter, so the second transistor Q2 is not turned on, and the signal given to the driving module 20 is a high level, and the high level received by the control module is an undistorted signal. If the power amplifier is distorted, the first transistor Q1 is turned on, and the collector of the first transistor Q1 is connected in parallel due to the fourth resistor R4 and the sixth resistor R6, so the voltage of the emitter of the second transistor Q2 is greater than the voltage of the base, so that the second transistor Q2 is turned on, and the driving signal given to the driving module 20 is a low level, and the low level received by the control module is a distorted signal.

[0084] It should be noted that the seventh resistor R7, the eighth resistor R8 and the ninth resistor R9 function as voltage-dividing resistors.

[0085] Optionally, in some feasible embodiments, reference Figure 5 , the driving module 20 includes:

[0086] a third triode Q3, wherein the base of the third triode Q3 is connected to the second end of the eighth resistor R8, and the emitter of the third triode Q3 is grounded;

[0087] a tenth resistor R10, wherein a first end of the tenth resistor R10 is connected to the collector of the third transistor Q3, and a second end of the tenth resistor R10 is connected to a preset reference voltage Ref1;

[0088] an eleventh resistor R11, a first end of the eleventh resistor R11 is connected to the first end of the tenth resistor R10, and a second end of the eleventh resistor R11 is used to output a distorted signal;

[0089] A twelfth resistor R12, wherein a first end of the twelfth resistor R12 is connected to the second end of the tenth resistor R10, and a second end of the twelfth resistor R12 is connected to the second end of the eleventh resistor R11.

[0090] In this embodiment, if the power amplifier is not distorted, the second transistor Q2 is not turned on, and the base voltage of the third transistor Q3 is the same as the ground terminal, so the third transistor Q3 is also not turned on, and the level of AMP_CLIP is high. If the power amplifier is distorted, the second transistor Q2 is turned on, and the base voltage of the third transistor Q3 is greater than V be , so that the third transistor Q3 is turned on, so that the level of the network AMP_CLIP is set low, that is, a distortion signal is output to the control module. In a specific application, the level change of the output distortion signal is notified to the DSP or MCU, and the gain of the power amplifier is controlled by the DSP or MCU to protect the power amplifier.

[0091] It should be noted that the preset reference voltage Ref1 may be a power supply terminal of the control module, specifically 1.8V or 3.3V, or may be a voltage obtained through voltage conversion based on the power supply terminal PVDD of the power amplifier.

[0092] Optionally, in some feasible embodiments, reference Figure 5 , the driving module 20 further includes:

[0093] A capacitor C1, wherein a first end of the capacitor C1 is connected to a second end of the eleventh resistor R11, and a second end of the capacitor C1 is grounded.

[0094] In this embodiment, the capacitor C1 plays a role in preventing digital signal jitter, that is, jitter of the output driving signal, improving the stability of signal transmission, and playing a filtering role.

[0095] Optionally, in some feasible embodiments, reference Figure 5 , the protection unit 13 comprises:

[0096] A thirteenth resistor R13, a first end of the thirteenth resistor R13 is used to connect to the output end of the power amplifier;

[0097] A diode D1, wherein a first end of the diode D1 is connected to a second end of the thirteenth resistor R13, and a second end of the diode D1 is connected to a first end of the first resistor R1.

[0098] In this embodiment, the thirteenth resistor R13 is a current limiting resistor, which plays a role of current limiting, and the diode D1 plays a role of reverse isolation.

[0099] For example, in combination with the above embodiment, if the on-state voltage of the diode D1 at room temperature is 0.7V, the preset output voltage is V clip +0.7V+0.6V. If the voltage at the output of the power amplifier is greater than V clip When the voltage is +0.7V+0.6V, the first transistor Q1 is turned on. When the first transistor Q1 is turned on, the voltage of the emitter of the second transistor Q2 is greater than the voltage of the base, so that the second transistor Q2 is turned on. When the second transistor Q2 is turned on, the base voltage of the third transistor Q3 is greater than 0.6V, so that the third transistor Q3 is turned on, thereby pulling down the second end of the eleventh resistor R11, so that the level of the network AMP_CLIP is set low. The present application builds a detection circuit through diodes, transistors, resistors and capacitors to achieve a distortion detection function, which greatly reduces the cost.

[0100] It should be noted that if Figure 4 and 5As shown, if the detection module 10 includes three protection units, namely 13-1, 13-2 and 13-3, the protection unit 13-1 includes a thirteenth resistor R13-1 and a diode D1-1, the thirteenth resistor R13-1 is respectively connected to the power amplifier output terminal A-1 and the diode D1-1, and the diode D1-1 is connected to the first resistor R1; the protection unit 13-2 includes a thirteenth resistor R13-2 and a diode D1-2, the thirteenth resistor R13-2 is respectively connected to the power amplifier output terminal A-2 and the diode D1-2, and the diode D1-2 is connected to the first resistor R1; the protection unit 13-3 includes a thirteenth resistor R13-3 and a diode D1-3, the thirteenth resistor R13-3 is respectively connected to the power amplifier output terminal A-3 and the diode D1-3, and the diode D1-3 is connected to the first resistor R1. Thus, the current backflow between the power amplifier output terminal A-1, the power amplifier output terminal A-2 and the power amplifier output terminal A-3 is protected, that is, the direction isolation is performed, and further, when the voltage of any power amplifier output terminal is higher than the preset output voltage, a distorted signal is output, so that the control module adjusts the gain of the power amplifier. Thus, the present application achieves the effect of protecting multiple power amplifiers at the same time.

[0101] The present application also proposes a distortion detection module, which includes a distortion detection circuit. The specific structure of the distortion detection module refers to the above-mentioned embodiment. Since the optimized distortion detection module adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0102] The present application also proposes a distortion detection device, which includes a distortion detection module. The specific structure of the distortion detection device refers to the above embodiment. Since the optimized distortion detection device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0103] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0104] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0105] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a computer storage medium (such as Flash memory, ROM / RAM, disk, CD), including several instructions for enabling a controller in a terminal device (which can be a mobile phone, computer, server, or network device, etc.) for controlling the storage medium to perform data read and write operations to execute the methods described in each embodiment of the present application.

[0106] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A distortion detection circuit, characterized in that: The distortion detection circuit is connected to the control module, and the distortion detection circuit includes: A detection module, the detection module is used to connect to at least one power amplifier output terminal, and isolate the output drive signal when detecting that the power amplifier output voltage of the power amplifier output terminal is greater than a preset output voltage; A driving module, the driving module is connected to the detection module, and is used to receive the driving signal and output a distortion signal of the driving signal, so that the control module can adjust the power amplifier based on the distortion signal.

2. The distortion detection circuit according to claim 1, characterized in that: The detection module comprises: A detection unit, wherein a first end of the detection unit is used to connect to at least one power amplifier output end, and when the detection unit detects that the power amplifier output voltage of the power amplifier output end is greater than a preset output voltage, a second end of the detection unit outputs a driving signal; An isolation unit, wherein a first end of the isolation unit is connected to a second end of the detection unit, and a second end of the isolation unit is connected to the driving module, for receiving the driving signal and isolating and outputting the driving signal to the driving module.

3. The distortion detection circuit according to claim 2, characterized in that: The detection module also includes: At least one protection unit, a first end of the protection unit is used to connect to the output end of the power amplifier, and a second end of the protection unit is connected to the detection unit.

4. The distortion detection circuit according to claim 3, characterized in that: The detection unit comprises: A first resistor, wherein a first end of the first resistor is used to connect to an output end of the power amplifier; A first triode, wherein a base of the first triode is connected to a second end of the first resistor; a second resistor, wherein a first end of the second resistor is connected to a base of the first transistor, a third resistor, wherein a first end of the third resistor is connected to a second end of the second resistor, and a second end of the third resistor is connected to an emitter of the first transistor; a fourth resistor, wherein a first end of the fourth resistor is connected to the emitter of the first transistor, and a second end of the fourth resistor is connected to the power supply terminal of the power amplifier; a fifth resistor, wherein a first end of the fifth resistor is connected to the emitter of the first transistor, and a second end of the fifth resistor is grounded; A sixth resistor, wherein a first end of the sixth resistor is connected to the collector of the first transistor, and a second end of the sixth resistor is connected to the power supply end of the power amplifier.

5. The distortion detection circuit according to claim 4, characterized in that: The isolation unit comprises: a second triode, wherein the base of the second triode is connected to the collector of the first triode; a seventh resistor, wherein a first end of the seventh resistor is connected to a second end of the sixth resistor, and a second end of the seventh resistor is connected to an emitter of the second transistor; an eighth resistor, a first end of the eighth resistor being connected to the collector of the second transistor; A ninth resistor, wherein a first end of the ninth resistor is connected to the second end of the eighth resistor, and a second end of the ninth resistor is grounded.

6. The distortion detection circuit according to claim 5, characterized in that: The driving module comprises: a third triode, wherein the base of the third triode is connected to the second end of the eighth resistor, and the emitter of the third triode is grounded; a tenth resistor, wherein a first end of the tenth resistor is connected to the collector of the third transistor, and a second end of the tenth resistor is connected to a preset reference voltage; an eleventh resistor, a first end of the eleventh resistor being connected to the first end of the tenth resistor, and a second end of the eleventh resistor being used for outputting a distorted signal; A twelfth resistor, wherein a first end of the twelfth resistor is connected to the second end of the tenth resistor, and a second end of the twelfth resistor is connected to the second end of the eleventh resistor.

7. The distortion detection circuit according to claim 6, characterized in that: The driving module comprises: A capacitor, a first end of the capacitor is connected to the second end of the eleventh resistor, and a second end of the capacitor is grounded.

8. The distortion detection circuit according to claim 6, characterized in that: The protection unit comprises: A thirteenth resistor, a first end of the thirteenth resistor is used to connect to the output end of the power amplifier; A diode, a first end of the diode is connected to the second end of the thirteenth resistor, and a second end of the diode is connected to the first end of the first resistor.

9. A distortion detection module, characterized in that: The distortion detection module comprises a distortion detection circuit as described in any one of claims 1-8.

10. A distortion detection device, characterized in that: The distortion detection device comprises the distortion detection module as claimed in claim 9.

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