Power amplifier fault detection module

Abstract

The utility model relates to the technical field of power amplifier fault detection, and discloses a power amplifier fault detection module, which is configured at the output of a power amplifier circuit, is used for power amplifier fault detection, and comprises a diode D25, a resistor R183, a capacitor C135, a Zener diode Z4, a triode Q17, a resistor R185, a Zener diode Z5, an optocoupler IS3 and an MCU. According to the utility model, a capacitor C135 is used for filtering, and a diode D25 is used for ensuring one-way transmission of signals; the triode Q17 realizes signal control under the cooperation of a resistor R183 and a voltage stabilizing diode Z4; the voltage stabilizing diode Z5 protects output, and the resistor R185 is connected with the optocoupler IS3 to realize signal isolation transmission to the MCU, so that accurate signal processing is realized, the fault detection accuracy is improved, the optocoupler isolation effectively prevents interference, the system stability is enhanced, and the cost and complexity are reduced based on the combination of simple and efficient elements.

Description

Technical Field

[0001] This application relates to the field of power amplifier fault detection technology, specifically a power amplifier fault detection module. Background Technology

[0002] The inventors discovered the following problems in existing power amplifier fault detection technologies:

[0003] 1. Using a single sensor limits detection accuracy and makes it difficult to accurately detect subtle faults in the power amplifier's operation;

[0004] 2. The signal transmission process is easily affected by external interference, leading to inaccurate detection results;

[0005] 3. The complex detection circuit structure is not only costly, but also increases the system's failure rate and maintenance difficulty;

[0006] 4. The lack of effective isolation measures means that a power amplifier failure may damage the detection system.

[0007] The aforementioned problems affect the stability and reliability of the entire power amplifier system, and cannot meet the ever-increasing demands for power amplifier fault detection. Therefore, a new technical solution for power amplifier fault detection is urgently needed to solve these problems. Utility Model Content

[0008] The purpose of this application is to provide a power amplifier fault detection module to solve the technical problems mentioned in the background art.

[0009] To achieve the above objectives, this application discloses the following technical solution: a power amplifier fault detection module, including diode D25, resistor R183, capacitor C135, Zener diode Z4, transistor Q17, resistor R185 and Zener diode Z5, optocoupler IS3 and MCU;

[0010] In this configuration, one end of capacitor C135 and the anode of diode D25 are both connected to the power amplifier signal input terminal; the cathode of diode D25 and one end of resistor R183 are both connected to the collector of transistor Q17, and the other end of resistor R183 and the cathode of Zener diode Z4 are both connected to the base of transistor Q17; the emitter of transistor Q17 and the cathode of Zener diode Z5 are both connected to one end of resistor R185; the cathodes of Zener diode Z4 and Z5, and pin 2 of optocoupler IS3 are all connected to the power amplifier signal output terminal; the other end of resistor R185 is connected to pin 1 of optocoupler IS3, pin 3 of optocoupler IS3 is grounded, and pin 4 of optocoupler IS3 is connected to the MCU.

[0011] Beneficial effects: The power amplifier fault detection module of this application uses capacitor C135 for filtering and diode D25 to ensure unidirectional signal transmission; transistor Q17 achieves signal control in conjunction with resistor R183 and Zener diode Z4; Zener diode Z5 protects the output; resistor R185 connects to optocoupler IS3 to achieve signal isolation and transmission to MCU, thereby achieving accurate signal processing, improving the accuracy of fault detection, and optocoupler isolation effectively prevents interference and enhances system stability. Based on the combination of simple and efficient components, the cost and complexity are reduced. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 The circuit diagram of the power amplifier fault detection module provided in the embodiment of this application. Detailed Implementation

[0014] The technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0015] In this document, the term "comprising" is intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0016] This embodiment discloses, as follows: Figure 1 The power amplifier fault detection module shown includes diode D25, resistor R183, capacitor C135, Zener diode Z4, transistor Q17, resistor R185 and Zener diode Z5, optocoupler IS3 and MCU.

[0017] In this configuration, one end of capacitor C135 and the anode of diode D25 are both connected to the power amplifier signal input terminal; the cathode of diode D25 and one end of resistor R183 are both connected to the collector of transistor Q17, and the other end of resistor R183 and the cathode of Zener diode Z4 are both connected to the base of transistor Q17; the emitter of transistor Q17 and the cathode of Zener diode Z5 are both connected to one end of resistor R185; the cathodes of Zener diode Z4 and Z5 and pin 2 of optocoupler IS3 are all connected to the power amplifier signal output terminal; the other end of resistor R185 is connected to pin 1 of optocoupler IS3, pin 3 of optocoupler IS3 is grounded, and pin 4 of optocoupler IS3 is connected to the MCU. Specifically, the power amplifier signal input terminal and the power amplifier signal output terminal are connected in parallel to the power amplifier circuit output signals SW_HOT1 and SW_COM1. The power amplifier signal input terminal is connected to the power amplifier circuit output signal SW_HOT1, and the power amplifier signal output terminal is connected to the power amplifier circuit output signal SW_COM1.

[0018] In this embodiment, the resistor R183 is a 10K / 2W type, the diode D25 is an M7 (1N4007) type, the capacitor C135 is a 102 / 2KV type, the Zener diode Z4 is a 3.3V type, the transistor Q17 is a MJE13003 type (manufacturer: UTC), the resistor R185 is a 100R type, the Zener diode Z5 is a 3.3V type, and the optocoupler IS3 is a TLP521 type.

[0019] The working principle of this embodiment is as follows:

[0020] The power amplifier circuit outputs signal SW_HOT1 as the input signal source. Capacitor C135 acts as a filter, removing high-frequency noise or interference signals from the input signal source, making the signal input to subsequent circuits more stable. Diode D25 acts as a rectifier and provides unidirectional conduction, ensuring that the signal is transmitted in the expected direction and preventing reverse signals from interfering with the circuit.

[0021] The cathode of diode D25 is connected to the collector of transistor Q17 and one end of resistor R183. The other end of resistor R183 is connected to the cathode of Zener diode Z4 and then to the base of transistor Q17, thus forming a feedback control circuit. When the input signal reaches the collector of transistor Q17 through diode D25, if the signal strength or voltage reaches a certain level, transistor Q17 will turn on. Zener diode Z4 stabilizes the base voltage of transistor Q17, ensuring that transistor Q17 operates within a certain voltage range and preventing voltage fluctuations from affecting the control of the transistor. When transistor Q17 is turned on, its emitter will have current output.

[0022] The emitter of transistor Q17 is connected to the negative terminal of Zener diode Z5 and one end of resistor R185. The other end of resistor R185 is connected to pin 1 of optocoupler IS3. Zener diode Z5 acts as a protection mechanism, preventing excessively high or low voltage at the emitter of transistor Q17 from affecting subsequent circuits. When transistor Q17 is turned on and there is current output from its emitter, the current flows through resistor R185 into pin 1 of optocoupler IS3. Optocoupler IS3 serves as a signal isolation and transmission mechanism. Its pin 3 is grounded, and its pin 4 is connected to the MCU (i.e., AMP_ADC1). Optocoupler IS3 electrically isolates the input side (output signal of transistor Q17) from the output side of the MCU. This prevents fault signals or interference in the power amplifier circuit from affecting subsequent detection circuits, and at the same time converts the signal output by transistor Q17 into a signal suitable for reception by the MCU (i.e., AMP_ADC1). The power amplifier signal output receives the signal from pin 2 of the optocoupler and returns it to the power amplifier (speaker). The MCU is an existing analog-to-digital converter circuit and a corresponding module for receiving and processing fault detection feedback signals. It is used to generate corresponding control signals based on the fault detection feedback signals to control the next execution of the power amplifier system. For example, it can be a main backup selection control signal for a power amplifier circuit with main backup switching.

[0023] Based on the above working principle, the power amplifier fault detection module in this embodiment monitors and processes the signal of a specific node (SW_HOT1) in the power amplifier circuit. Utilizing the conduction characteristics of transistors, the voltage regulation effect of Zener diodes, and the isolation transmission function of optocouplers, it converts the power amplifier's operating status signal into a signal that can be detected and analyzed by subsequent circuits, thereby achieving the diagnosis of power amplifier faults. When the power amplifier is working normally, the output signal of this module is within the normal range. When the power amplifier malfunctions, for example, due to abnormal output signal or voltage fluctuations, the output signal of this module will change. Subsequent detection circuits can determine whether the power amplifier has malfunctioned and the type and severity of the malfunction based on these changes.

[0024] In summary, the power amplifier fault detection module in this embodiment uses capacitor C135 for filtering and diode D25 to ensure unidirectional signal transmission. Transistor Q17, in conjunction with resistor R183 and Zener diode Z4, achieves signal control. Zener diode Z5 protects the output, and resistor R185 connects to optocoupler IS3 to achieve signal isolation and transmission to the MCU, thereby achieving precise signal processing, improving the accuracy of fault detection, and the optocoupler isolation effectively prevents interference, enhancing system stability. Based on the combination of simple and efficient components, the cost and complexity are reduced.

[0025] Finally, it should be noted that the above description is only a preferred embodiment of this application and is not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A power amplifier fault detection module, characterized in that, This includes diode D25, resistor R183, capacitor C135, Zener diode Z4, transistor Q17, resistor R185 and Zener diode Z5, optocoupler IS3 and MCU; In this configuration, one end of capacitor C135 and the anode of diode D25 are both connected to the power amplifier signal input terminal; the cathode of diode D25 and one end of resistor R183 are both connected to the collector of transistor Q17, and the other end of resistor R183 and the cathode of Zener diode Z4 are both connected to the base of transistor Q17; the emitter of transistor Q17 and the cathode of Zener diode Z5 are both connected to one end of resistor R185; the optocoupler IS3 is a TLP521; the cathodes of Zener diode Z4 and Z5, and pin 2 of optocoupler IS3 are all connected to the power amplifier signal output terminal; the other end of resistor R185 is connected to pin 1 of optocoupler IS3, pin 3 of optocoupler IS3 is grounded, and pin 4 of optocoupler IS3 is connected to the MCU.

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