Circuit and system for detecting howling of PCB (Printed Circuit Board) device

Abstract

The utility model relates to the technical field of PCB device detection, in particular to a circuit and a system for detecting PCB device howling. The circuit comprises a measurement microphone (Mic) used for receiving an audio signal of a PCB to be measured; and the amplifying circuit comprises an NE5532 operational amplifier and is used for amplifying the audio signal received by the measuring microphone. According to the utility model, the measurement microphone (Mic) and the high-sensitivity loudspeaker are adopted, so that audio signals within the range of 20 Hz to 20 kHz can be accurately received and played, and the whistling sound of the PCB device can be accurately detected. Meanwhile, the operational amplifier NE5532 and a resistor and a capacitor configured by the operational amplifier NE5532 can effectively amplify and filter audio signals, so that fine whistling sound can be clearly detected, and the detection precision is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to PCB device detection technical field, concretely is a kind of circuit and system for detecting PCB device howl. BACKGROUND

[0002] Modern electronic product integrated circuit's PCB board is integrated with a large number of electronic devices, and ceramic capacitor can vibrate due to piezoelectric effect, inductance also vibrates due to switch excitation current when working, so that coil slightly deviates and vibrates, thereby generating howling sound in the audible range of human ear of 20Hz-20kHz. When detecting PCB, judging ceramic capacitor or high-frequency inductor howling can only rely on human ear to listen, or more accurately need oscilloscope, spectrum analyzer to test circuit waveform one by one. The recognition audio frequency of human ear is 20-20Khz, and low frequency and high frequency cannot be perceived, and different people have large hearing error;With professional oscilloscope, spectrum analyzer to measure one by one, obviously, in the judgment of whether there is howling, the detection efficiency is greatly reduced, and long working hours are occupied. SUMMARY

[0003] The utility model provides a kind of circuit and system for detecting PCB device howling to solve the technical problems of low detection precision and low efficiency of PCB howling in view of the technical problems existing in prior art.

[0004] The technical solution for solving the above technical problem of the utility model is as follows:

[0005] On the one hand, a kind of circuit for detecting PCB device howling is provided, and the circuit comprises:

[0006] A measuring microphone (Mic) is used to receive the audio signal of the PCB to be detected.

[0007] An amplification circuit comprising an NE5532 operational amplifier is used to amplify the audio signal received by the measuring microphone.

[0008] Resistors R3, R4, R5 and R6, wherein the resistors R3 and R4 are connected to the input terminal of the NE5532 operational amplifier, and the resistors R5 and R6 are connected to the feedback path of the NE5532 operational amplifier, for controlling the amplification factor.

[0009] Detection capacitors C5 and C6 are connected to the input terminal of the amplification circuit, for filtering the received audio signal.

[0010] A high-sensitivity loudspeaker is used to play the amplified audio signal.

[0011] Further, the measurement microphone has a flat free-field response in the range of 20Hz to 20kHz.

[0012] The amplification of the NE5532 operational amplifier is adjusted by the resistors R3, R4, R5 and R6, and the amplification is in the range of 20 to 100 times, to ensure the clarity and transparency of the sound quality.

[0013] Further, the resistors R3 and R4 have a resistance of 1kΩ, and the resistors R5 and R6 have a resistance of 100kΩ.

[0014] Further, the capacitance of the detection capacitors C5 and C6 is in the range of 22μF to 100μF.

[0015] Further, the frequency response range of the high-sensitivity loudspeaker is 20Hz to 20kHz.

[0016] On the other hand, a system for detecting the whistling of PCB devices is provided, comprising the circuit for detecting the whistling of PCB devices as described above, and further comprising:

[0017] A PCB sample machine to be tested is used to run full load and generate audio signals;

[0018] An audio signal processing unit is used to receive and process the audio signals output from the loudspeaker.

[0019] Further, the amplification circuit further comprises:

[0020] An adjustable potentiometer is used to accurately adjust the amplification to adapt to the audio signal characteristics of different PCB sample machines; and

[0021] A filter circuit is used to reduce the interference of non-target frequencies on the detection results.

[0022] The filter circuit comprises a high-pass filter and a low-pass filter, respectively used to filter audio signals below 20Hz and above 20kHz.

[0023] The beneficial effects of the present application are:

[0024] The measurement microphone (Mic) and the high-sensitivity loudspeaker are used to accurately receive and play audio signals in the range of 20Hz to 20kHz, ensuring accurate detection of the whistling sound of PCB devices. At the same time, the operational amplifier NE5532 and the resistors and capacitors configured thereby can effectively amplify and filter the audio signals, so that subtle whistling sounds can also be clearly detected, improving the detection accuracy. At the same time, the detection circuit and system of the present application can quickly detect the entire PCB, greatly shortening the detection time and greatly improving the detection efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 Circuit diagram for detecting the whistling of the PCB device of the utility model;

[0026] Figure 2 Flow chart for detecting the whistling of the PCB device of the utility model. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the utility model more clear and intelligible, the following combines the drawings and examples, and further specifically describes the utility model. The examples of the examples are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The examples described below by referring to the drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model.

[0028] In the description of the utility model, it should be pointed out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication or interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0029] The following disclosure provides many different embodiments or examples for implementing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the utility model. In addition, the utility model can repeatedly refer to numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0030] Reference Figure 1 And Figure 2 As shown in the drawings, the utility model provides the following preferred examples:

[0031] Example one

[0032] To solve the problem of detecting the possible whistling noise of PCB devices during operation, the embodiment proposes a circuit for detecting the whistling of PCB devices, which can sensitively and accurately detect the whistling noise. In this embodiment, the detection circuit includes a measurement microphone (Mic) for receiving the audio signal of the PCB to be tested. The microphone is selected as a sensor with a wide frequency response range to ensure that it can receive sound wave signals in the range of 20Hz to 20kHz, which covers all frequencies that can be heard by human ears.

[0033] Further, in order to enhance the strength of the detection signal, the circuit integrates a NE5532 operational amplifier. The operational amplifier is selected for its low noise and high bandwidth characteristics, which can significantly amplify the weak audio signal received by the microphone, making the detection of whistling more sensitive. In order to control the amplification factor, resistors R3 and R4 are introduced at the input of NE5532, and the resistance values of these two resistors are designed to be 1kΩ to ensure appropriate amplification of the input signal; at the same time, resistors R5 and R6 are connected in series in the feedback path of NE5532, and the resistance values of these two resistors are set to 100kΩ to adjust the feedback signal, thereby achieving precise control of the amplification factor. It should be understood that by adjusting the values of these resistors, the gain of the amplifier can be flexibly controlled to adapt to different detection needs.

[0034] In this embodiment, detection capacitors C5 and C6 are also designed at the input of the amplification circuit, and these capacitors are selected to be in the range of 22μF to 100μF to effectively filter the audio signal entering the amplifier. This filtering process can significantly reduce the interference of low-frequency noise, thereby improving the clarity of the signal and the accuracy of the detection.

[0035] The amplified audio signal will be played by a high-sensitivity loudspeaker. The loudspeaker is designed to cover the frequency response range of 20Hz to 20kHz, ensuring that any frequency of whistling sound can be accurately played out for further manual detection or equipment monitoring by the operator. It should be understood that such design enables the system to efficiently detect and identify various whistling sounds that may be generated by PCB devices during operation, providing reliable data support for subsequent fault analysis and elimination.

[0036] Through the design of this embodiment, the detection circuit can detect the whistling of PCB devices with high sensitivity and high reliability, effectively improving the efficiency and accuracy of detection, and is suitable for the production and maintenance process of various PCB devices.

[0037] Embodiment Two

[0038] To solve the problem of accurately detecting PCB device howling noise in a wide frequency range, the embodiment further refines the design of the circuit, specifically optimizing the selection and configuration of the measurement microphone and operational amplifier. The measurement microphone (Mic) has a flat free-field response characteristic in the range of 20Hz to 20kHz, ensuring that it can faithfully capture and transmit all acoustic signals generated by the PCB under test. This characteristic enables the microphone to efficiently perceive various noise frequencies, including howling, laying a solid foundation for subsequent signal processing.

[0039] Further, the NE5532 operational amplifier in the circuit is configured to have adjustable amplification, so as to flexibly adjust the amplification in different application scenarios, thereby ensuring the clear and transparent sound quality of the output signal. Through the precise configuration of resistors R3, R4, R5 and R6, the amplification of the amplifier can be adjusted between 20 and 100 times, ensuring that no distortion or noise amplification occurs during signal amplification. It should be understood that by adjusting the resistance values of these resistors, precise control of the amplification can be achieved, thereby adapting to the detection needs of different PCB devices in different environments.

[0040] The benefit of the embodiment is that by precisely adjusting the amplification and ensuring the flatness of the frequency response of the microphone, the detection circuit can maintain efficient signal amplification and noise detection capability in a wide frequency range. This optimized design improves the accuracy and sensitivity of howling detection, suitable for various high-demand PCB detection environments.

[0041] Embodiment Three

[0042] To ensure the stability and accuracy of the signal during amplification of the detection circuit, the embodiment further optimizes the selection and configuration of resistors, introducing resistors with specific resistance values at the input end and feedback path of the NE5532 operational amplifier. In this embodiment, resistors R3 and R4 have resistance values of 1kΩ, and resistors R5 and R6 have resistance values of 100kΩ. Such configuration can ensure that the amplifier still maintains low noise and high stability characteristics under high gain conditions.

[0043] Further, by reasonably configuring these resistors, the gain of the amplifier can be precisely controlled within the suitable detection range, thereby ensuring that the amplification effect of the signal will not be distorted or lose important information due to excessively high or low gain. It should be understood that this resistance configuration not only has a direct impact on the amplification, but also can significantly reduce noise interference in the circuit, thereby improving the signal-to-noise ratio of the overall detection system.

[0044] The benefit of the embodiment is that by reasonably selecting and configuring the key resistance, the detection circuit can maintain high precision and high stability during signal amplification, which is suitable for PCB whistling sound detection scenarios that require high sensitivity.

[0045] Embodiment Four

[0046] To further optimize the filtering performance of the detection circuit and better filter out non-target frequency interference, detection capacitors C5 and C6 are introduced at the input end of the amplification circuit in this embodiment. The capacitance of these capacitors is designed to be in the range of 22μF to 100μF, which is used to filter the audio signal entering the amplifier. Through this design, power supply noise or other low-frequency interference signals can be effectively removed, thereby ensuring the purity of the amplifier input signal.

[0047] Further, by selecting capacitors with different capacitance values, selective filtering of different frequency band noises can be achieved. For example, a larger capacitance value capacitor can better filter low-frequency noise, while a smaller capacitance value capacitor can remove higher frequency interference while maintaining high-frequency signals. It should be understood that such filtering design is beneficial to improve the accuracy of PCB whistling sound detection and the clarity of the signal.

[0048] Through the design of this embodiment, the detection circuit can achieve efficient filtering effect through reasonable capacitor configuration, thereby improving the quality of the detection signal and ensuring that the final output sound signal can accurately reflect the actual operating state of the PCB device. It provides technical support for accurate detection and analysis of whistling sound.

[0049] Embodiment Five

[0050] To ensure that the detection system can capture the whistling sound in the entire audio frequency spectrum, a high-sensitivity loudspeaker is specially selected in this embodiment, with a frequency response range covering 20Hz to 20kHz. It ensures that the loudspeaker can faithfully play all the amplified audio signals for the operator or detection system to judge.

[0051] Further, the loudspeaker not only can handle signals in a wide frequency range, but also has high sensitivity, which can produce sufficient sound pressure level at low input power to ensure that the whistling sound can be effectively detected and recognized. It should be understood that the application of high-sensitivity loudspeakers not only improves the overall performance of the system, but also provides reliable output for quickly and accurately identifying whistling sound in PCB devices.

[0052] Through the design of this embodiment, the detection system can accurately and clearly reproduce the operating sound of the PCB device in the full frequency band, especially the whistling noise, thereby providing an important basis for subsequent fault analysis and elimination.

[0053] Embodiment Six

[0054] To address the need for comprehensive audio signal processing in the PCB whistling detection process, this embodiment further optimizes the design of the detection system by integrating an audio signal processing unit for analyzing and processing the audio signals output from the speaker. In this embodiment, the system not only includes the aforementioned detection circuit but also includes a sample machine under test and an audio signal processing unit.

[0055] Firstly, the PCB sample machine under test may produce whistling sound when it is running at full load. This whistling sound is received by the measurement microphone and amplified by the amplifier circuit. To ensure accurate processing of all detected audio signals, the audio signal processing unit is designed to further analyze the received audio signals, such as frequency component decomposition, noise filtering, etc. Through the audio signal processing unit, the amplified signal can be converted into a digital signal that can be judged by the operator or the automatic system.

[0056] Further, the audio signal processing unit can include a DSP (Digital Signal Processor) or other dedicated audio processing chip for real-time analysis and recording of signals. This unit can compare the acoustic characteristics produced by the PCB device under different working conditions to more accurately determine the source and intensity of the whistling sound. It should be understood that the integration of the audio signal processing unit significantly improves the system's ability to analyze complex audio signals, especially the ability to identify weak whistling sounds that are difficult to detect during operation.

[0057] Through the design of this embodiment, the entire detection system can perform full-process detection and analysis of PCB whistling sound from reception, amplification, playback to signal processing, greatly improving the accuracy and efficiency of detection. This system provides strong technical support for the operation state monitoring of PCB devices.

[0058] Embodiment Seven

[0059] To further improve the flexibility and accuracy of PCB device whistling sound detection, this embodiment introduces an adjustable potentiometer and a filter circuit in the amplifier circuit. This design can effectively cope with the differences in audio characteristics of different PCB sample machines, making the gain adjustment and frequency response of the detection circuit more flexible and controllable.

[0060] Firstly, the adjustable potentiometer is used to accurately adjust the gain of the amplifier circuit to adapt to the audio signal characteristics of different PCB sample machines. By adjusting the potentiometer, the amplification factor can be fine-tuned according to actual detection needs, ensuring that the amplified audio signal is clear enough and does not produce distorted or overloaded signals. This design is suitable for situations that require high sensitivity detection, such as detection of high-frequency noise or weak whistling sound, which can ensure signal clarity through appropriate gain adjustment.

[0061] Further, the present embodiment also introduces a filter circuit to reduce the interference of non-target frequencies on the detection results. The filter circuit includes a high-pass filter and a low-pass filter, respectively used to filter low-frequency signals below 20Hz and high-frequency signals above 20kHz. Signals outside these frequency ranges are generally irrelevant to the detection of PCB whistling, and removing these noise components can significantly improve the accuracy of detection. Through reasonable configuration of the filter circuit, the system can focus on signal processing within the target frequency range, thereby ensuring the reliability of the detection results.

[0062] Through the design of the present embodiment, the detection system not only has strong signal gain adjustment capability, but also has precise frequency response control, which can better cope with the whistling detection requirements of different types of PCB prototypes. Further improve the overall performance of the detection system, especially in complex and variable working environments.

[0063] The beneficial effects of the present application are embodied in the above-mentioned preferred embodiments of the present application, and are not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A circuit for detecting a howl of a PCB device, characterized by, The circuit comprises: a measurement microphone (Mic) for receiving audio signals of a PCB to be measured; an amplification circuit comprising a NE5532 operational amplifier for amplifying the audio signals received by the measurement microphone; resistors R3, R4, R5 and R6, wherein the resistors R3 and R4 are connected to the input of the NE5532 operational amplifier, and the resistors R5 and R6 are connected to the feedback path of the NE5532 operational amplifier for controlling the amplification factor; detection capacitors C5 and C6 connected to the input of the amplification circuit for filtering the received audio signals; and a high-sensitivity loudspeaker for playing the amplified audio signals.

2. The circuit for detecting a PCB device howl of claim 1, wherein, The measurement microphone has a flat free-field response in the range of 20 Hz to 20 kHz. The amplification factor of the NE5532 operational amplifier is adjusted by the resistors R3, R4, R5 and R6, and the amplification factor ranges between 20 and 100 times to ensure clear and transparent sound quality.

3. The circuit for detecting a howling of a PCB device according to claim 1 or 2, wherein The resistors R3 and R4 have a resistance of 1 kΩ, and the resistors R5 and R6 have a resistance of 100 kΩ.

4. The circuit for detecting a howling of a PCB device according to claim 3, wherein, The detection capacitors C5 and C6 have a capacitance ranging from 22 μF to 100 μF.

5. The circuit for detecting a howling of a PCB device according to claim 1 or 4, wherein The high-sensitivity loudspeaker has a frequency response ranging from 20 Hz to 20 kHz.

6. A system for detecting howling of a PCB device, characterized by The system further comprises: a PCB prototype to be measured for full-load operation and generating audio signals; an audio signal processing unit for receiving and processing the audio signals output from the loudspeaker.

7. The system for detecting a howling of a PCB device of claim 6, wherein, The amplification circuit further comprises: an adjustable potentiometer for accurately adjusting the amplification factor to adapt to the audio signal characteristics of different PCB prototypes; and a filter circuit for reducing the interference of non-target frequencies on the detection results. The filter circuit comprises a high-pass filter and a low-pass filter for filtering audio signals below 20 Hz and above 20 kHz, respectively.

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