A power amplifier for loudspeaker commissioning

Abstract

The utility model provides a kind of power amplifier for loudspeaker debugging, it is related to testing technical field, including signal input module, preamplification module, PWM modulation module, power amplifier module, low frequency filter module and output transformer module connected in turn;Signal input module is used to support the audio signal input of multiple ways;Preamplification module is used to amplify the intensity of audio signal, obtains intensity amplification signal;PWM modulation module is used to convert intensity amplification signal into high-frequency pulse signal;Power amplifier module is used to carry out power amplification to high-frequency pulse signal, obtains power amplification signal;Low frequency filter module is used to filter high-frequency interference signal in power amplification signal, obtains filter signal;Output transformer module is used to output filter signal to each loudspeaker to be debugged, to each loudspeaker to be debugged is debugged.The utility model embodiment can carry out synchronous single debugging in loudspeaker installation stage, improve debugging efficiency.

Description

Technical Field

[0001] This utility model relates to the field of debugging technology, and in particular to a power amplifier for loudspeaker debugging. Background Technology

[0002] With the widespread application of communication systems in various buildings, industrial facilities, and public places, loudspeakers, as key audio output devices, directly affect the overall performance of the system due to the quality of their installation and commissioning. In traditional communication system engineering, loudspeaker commissioning follows a "centralized commissioning after installation" work mode. This mode requires all loudspeakers to be physically installed and connected to the communication host via cables, after which commissioning personnel perform unified parameter configuration and functional testing through the host equipment. This centralized commissioning method is usually arranged during the project handover phase, when the system has entered the final stage of the project, with tight deadlines and concentrated tasks.

[0003] In the existing commissioning process, commissioning personnel rely on a communication host as the core commissioning equipment. The host sends test signals to each speaker and receives feedback to check key indicators such as line connectivity, impedance matching, and audio quality. Because commissioning can only begin after all speaker lines are connected to the host, quality defects in individual devices cannot be detected in time during the early installation phase. When the system enters the handover phase, a large number of faulty speakers often become apparent, including issues such as short circuits, impedance anomalies, and frequency response distortion. The concentrated repair of these problematic speakers not only requires laying additional temporary wiring for isolation testing but may also cause critical path delays due to the return-to-factory repair cycle. More seriously, in enclosed spaces or already renovated areas, the removal and replacement of faulty speakers may cause secondary construction damage, further increasing project costs and time pressure. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a power amplifier for speaker tuning, which can replace the function of the communication host, perform synchronous individual speaker tuning during the installation stage, and also meet the requirement of synchronous tuning of multiple speakers at one time, thereby minimizing the time of individual speaker tuning of the entire system and improving the efficiency of each tuning.

[0005] This utility model provides a power amplifier for speaker tuning, comprising a signal input module, a preamplifier module, a PWM modulation module, a power amplifier module, a low-frequency filter module, and an output transformer module connected in sequence. The signal input module is used to support multiple audio signal input methods; The preamplifier module is used to amplify the intensity of the audio signal to obtain an amplified intensity signal; The PWM modulation module is used to convert the intensity amplified signal into a high-frequency pulse signal; The power amplification module is used to amplify the high-frequency pulse signal to obtain a power amplified signal; The low-frequency filtering module is used to filter high-frequency interference signals in the power amplified signal to obtain a filtered signal. The output transformer module is used to output the filtered signal to at least one speaker to be tested, so as to test each of the speakers.

[0006] In a preferred embodiment of this utility model, the signal input module supports input methods including at least one of FM radio, SD card audio, USB audio, and AUX external audio.

[0007] In a preferred embodiment of this invention, the output transformer module includes a first transformer and a second transformer; the first transformer and the second transformer are respectively connected to different speakers to be tested.

[0008] In a preferred embodiment of the present invention, the power amplifier further includes a wooden housing.

[0009] In a preferred embodiment of this invention, the power amplifier further includes a third transformer and a fourth transformer; the third transformer is used to power the preamplifier module; and the fourth transformer is used to power the power amplifier module.

[0010] In a preferred embodiment of this utility model, the power amplification module uses a Sanken brand 8-tube dual 500W high-power amplifier chip.

[0011] In a preferred embodiment of this utility model, the power amplifier further includes a heat dissipation module; the heat dissipation module includes a finned heat sink and a silent fan; the finned heat sink is used to dissipate heat for the power amplifier module and to provide a prompt when there is a wiring problem with the speaker to be tested.

[0012] In a preferred embodiment of this utility model, one side of the insert-type heat sink is attached to the power amplifier module, and the other side is attached to the silent fan.

[0013] In a preferred embodiment of this utility model, the power amplifier further includes a power supply module; the power supply module includes a toroidal transformer and a rectifier bridge; the output terminal of the toroidal transformer is connected to the input terminal of the rectifier bridge, and the output terminal of the rectifier bridge provides voltage to the preamplifier module, the power amplifier module, and the signal input module, respectively.

[0014] In a preferred embodiment of this utility model, the toroidal transformer is a 500W high-power toroidal transformer, and the rectifier bridge is a KBPC5010 rectifier bridge.

[0015] The present invention provides the following beneficial effects: This invention provides a power amplifier for speaker tuning, completely replacing the communication host. It supports individual speaker tuning during the installation phase, eliminating the need to wait for the communication host and cables to be fully installed. A single tuning session can accommodate a large number of speakers, significantly reducing the total tuning time for individual speakers and lowering labor costs. Early tuning allows for the early detection of speaker and circuit problems, avoiding delays caused by later factory repairs.

[0016] Other features and advantages of this disclosure will be set forth in the following description, or some features and advantages may be inferred from the description or determined without doubt, or may be learned by practicing the techniques described above.

[0017] To make the above-mentioned objects, features and advantages of this disclosure more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 A schematic diagram of a power amplifier for loudspeaker tuning provided for an embodiment of this utility model; Figure 2 This is a top view of a power amplifier for speaker tuning, provided as an embodiment of the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] Based on experience in communication system installation and handover, all speaker commissioning is carried out during the system handover phase after installation. This phase has three drawbacks: commissioning can only be carried out after all the cables of the communication host are completed; a large number of speakers need to be commissioned, the schedule is tight, and the speakers with problems are concentrated, which will consume a lot of manpower and time to deal with these problematic speakers; if the problematic speakers need to be returned to the factory or repaired, it will affect the system handover time and delay the overall progress.

[0022] To avoid similar issues, a device needs to be developed to replace the communication host. This device should be able to perform synchronous individual speaker debugging during the installation phase, while also being able to debug a sufficient number of speakers at once. This would minimize the time required for individual speaker debugging of the entire system and improve the efficiency of each debugging session.

[0023] Based on this, the present invention provides a power amplifier for speaker debugging that supports multiple audio signal input methods without relying on on-site communication networks. Even in areas with weak networks, such as nuclear island plants and remote construction sites, signals can still be accessed through local storage devices, ensuring smooth debugging. Multiple speakers under test can be tested via an output transformer module, reducing the need for debugging personnel to travel back and forth and lowering manpower requirements. As a replacement for the communication host, it supports individual speaker debugging during the installation phase, eliminating the need to wait for the communication host and cables to be fully installed. Early debugging allows for the early detection of speaker and circuit problems, avoiding delays caused by later return-to-factory repairs and significantly improving testing efficiency.

[0024] To facilitate understanding of this embodiment, a power amplifier for speaker tuning disclosed in this utility model embodiment will first be described in detail.

[0025] Example 1 This utility model embodiment provides a power amplifier for speaker tuning. Figure 1 This is a schematic diagram of a power amplifier for speaker tuning, provided as an embodiment of the present invention. Figure 1 As shown, the power amplifier for speaker tuning may include the following structure: The signal input module 101, the preamplifier module 102, the PWM modulation module 103, the power amplifier module 104, the low-frequency filter module 105, and the output transformer module 106 are included. The signal input module 101 supports multiple audio signal input methods. Specifically, as the signal input of the power amplifier, it is compatible with various audio signal sources to meet the signal requirements of different debugging scenarios. Typical supported input methods include at least one of FM radio, SD card audio, USB audio, and AUX external audio. This avoids insufficient device compatibility due to different debugging scenarios (such as no network on site or the need for specific test audio), ensuring that the signal source can be selected as needed during debugging.

[0026] The preamplifier module 102 amplifies the intensity of the audio signal to obtain an amplified signal. Since the original signal input to the signal input module (such as a weak FM signal or a low-level signal output from a storage device) has low intensity, directly entering the power amplifier module can easily lead to signal distortion or poor amplification. Therefore, preprocessing by the preamplifier module is necessary. The preamplifier module can use a low-noise operational amplifier (such as an LM358) to linearly amplify the original signal, increasing the signal intensity to a level range that can be stably processed by subsequent modules (typically from millivolts to volts). The preamplifier module features low distortion and a high signal-to-noise ratio, avoiding the introduction of additional interference (such as current noise) during amplification.

[0027] The PWM modulation module 103 is used to convert the intensity amplified signal into a high-frequency pulse signal, that is, to convert the continuous audio signal into a high-frequency pulse signal, thus solving the problems of low efficiency and severe heat generation in traditional linear amplification. Specifically, the PWM modulation module 103 can use the pre-amplified audio signal (intensity amplified signal) as the modulation signal and a high-frequency square wave of a fixed frequency as the carrier signal; the two are combined by a comparator, so that the pulse width of the high-frequency square wave varies with the amplitude of the audio signal (e.g., the larger the amplitude of the audio signal, the wider the pulse width; the smaller the amplitude, the narrower the pulse width), and finally outputs the high-frequency pulse signal corresponding to the audio signal.

[0028] The power amplification module is used to amplify the high-frequency pulse signal to obtain a power amplified signal. Specifically, the power amplification module amplifies the PWM-modulated high-frequency pulse signal to a power level capable of driving multiple speakers under test simultaneously. In this embodiment of the invention, a Sanken 8-tube dual 500W high-power amplifier chip can be used.

[0029] The low-frequency filtering module is used to filter high-frequency interference signals in the power amplified signal to obtain a filtered signal. Since the high-frequency pulse signal after power amplification still contains a large number of high-frequency harmonics (interference signals outside the audio range), directly outputting it to the speaker would cause noise and feedback, affecting the auditor's judgment of the speaker's sound quality. Therefore, a low-frequency filtering module is needed for noise reduction. For example, an LC low-pass filter (composed of an inductor and capacitor) can be used, with its cutoff frequency set at 20kHz. This allows signals within the audio range (20Hz-20kHz) to pass through while blocking high-frequency interference signals (e.g., signals greater than 20kHz), ultimately outputting a clean analog audio signal (filtered signal). Filtering with the low-frequency filtering module ensures that the sound emitted by the speaker during the debugging process is free from additional interference, enabling the auditor to accurately identify the speaker's own defects (such as noise caused by diaphragm damage or distortion caused by coil failure).

[0030] The output transformer module is used to output the filtered signal to at least one speaker to be tested, so as to debug each speaker. One output transformer can be connected to multiple speakers to be tested. After the filtered signal is distributed to each speaker to be tested, the speaker will produce sound, and the tester can visually judge whether its sound quality, volume, and other performance characteristics are up to standard.

[0031] Furthermore, the output transformer module includes a first transformer and a second transformer; the first transformer and the second transformer are respectively connected to different speakers under test. It is understood that in practical use, multiple speakers under test can be connected to the same junction box, which is then connected to the transformer, allowing one transformer to test multiple speakers simultaneously. Since the output transformer module includes a first transformer and a second transformer, the first transformer and the second transformer can be connected to two different junction boxes, forming two circuits, thus enabling the testing of more speakers under test at once. By supporting dual-circuit synchronous debugging, speakers in different areas can be tested simultaneously, reducing the need for debugging personnel to travel back and forth and lowering manpower requirements.

[0032] Furthermore, the power amplifier also includes a third transformer and a fourth transformer; the third transformer is used to power the preamplifier module; and the fourth transformer is used to power the power amplifier module.

[0033] Furthermore, the power amplifier also includes a power supply module; the power supply module includes a toroidal transformer and a rectifier bridge; the output terminal of the toroidal transformer is connected to the input terminal of the rectifier bridge, and the output terminal of the rectifier bridge provides voltage to the preamplifier module, the power amplifier module and the signal input module respectively.

[0034] The toroidal transformer is a 500W high-power toroidal transformer, meaning the third and fourth transformers are both 500W high-power toroidal transformers. The rectifier bridge is a KBPC5010 rectifier bridge.

[0035] Furthermore, the power amplifier module uses a Sanken brand 8-tube dual 500W high-power amplifier chip.

[0036] Furthermore, the power amplifier also includes a heat dissipation module; the heat dissipation module includes a finned heat sink and a silent fan; the finned heat sink is used to dissipate heat from the power amplifier module and to provide a notification when there is a wiring problem with the speaker under test. Understandably, during actual on-site debugging, if the speaker cable termination in the test circuit is incorrect, the finned heat sink of the power amplifier will heat up instantly. This phenomenon can alert the debugging personnel to the presence of an incorrectly wired speaker in that circuit, facilitating debugging.

[0037] The power amplifier for speaker tuning provided in this embodiment can directly replace the audio output function of the communication host, allowing for individual speaker tuning during the installation phase. This enables early detection of equipment defects (such as damaged speaker diaphragms or incorrect wiring), avoiding delays caused by later factory repairs. Supporting multiple signal input methods such as FM, SD, USB, and AUX, it eliminates the need for on-site communication networks. Even in areas with weak network coverage, such as nuclear island plants and remote construction sites, signals can still be accessed via local storage devices, ensuring smooth tuning.

[0038] Example 2 This utility model embodiment also provides another power amplifier for speaker tuning; this power amplifier is implemented based on the above embodiment.

[0039] Figure 2 This is a top view of a power amplifier for loudspeaker tuning, provided as an embodiment of the present invention. Figure 2 As shown, the power amplifier includes the following structure: housing, first transformer, second transformer, third transformer, fourth transformer, silent fan, plug-in heat sink, power amplifier circuit board and front circuit board.

[0040] The output transformer module includes a first transformer and a second transformer; the first and second transformers are respectively connected to different speakers under test. The first and second transformers must be of high quality and have neatly and uniformly stacked silicon steel sheets for the magnetic core.

[0041] The third and fourth transformers are 500W toroidal transformers. The toroidal transformers output dual 24V, dual 12V, and dual 5V voltages. A rectifier bridge is also connected to the output of the toroidal transformer. The KBPC5010 rectifier bridge has a withstand voltage of 1000V, a current of 50A, and an operating temperature range of 0–70℃. The output of the toroidal transformer is connected to the input of the rectifier bridge, and the output of the rectifier bridge provides dual 5V voltage to the preamplifier module, dual 24V voltage to the power amplifier module, and dual 12V voltage to the signal input module.

[0042] The power amplifier also includes a heat dissipation module; the heat dissipation module includes a finned heat sink and a silent fan; the finned heat sink is used to dissipate heat from the power amplifier module and to provide a notification when there is a wiring problem with the speaker being tested. One side of the finned heat sink is attached to the power amplifier module, and the other side is attached to the silent fan.

[0043] A power amplifier circuit board refers to the circuit board containing the power amplifier module. A preamplifier circuit board refers to the circuit board containing the preamplifier module. Furthermore, a low-frequency filter module can also be integrated on the preamplifier circuit board. A PWM modulation module can also be integrated on the power amplifier circuit board.

[0044] Furthermore, the third transformer, fourth transformer, silent fan, finned heat sink, and front circuit board can be salvaged from the discarded equipment.

[0045] In one feasible implementation, the power amplifier has a power of 2304 watts. During single-loop commissioning, if each speaker to be commissioned is 6W, then this device can handle 384 6W speakers; if each speaker to be commissioned is 10W, then this device can handle 230 10W speakers. However, in actual field circuits, the number of speakers connected to a single speaker junction box is far less than the load that the homemade power amplifier can handle.

[0046] The power of the power amplifier can be calculated using the following formula: P=U 2 ÷R Where P is the maximum power without distortion. U is the equivalent power supply voltage of the maximum output voltage, which is calculated as 220V in this embodiment. R is the speaker impedance, which is 21Ω in this embodiment.

[0047] The power amplifier for speaker tuning provided in this embodiment can replace the audio output function of a communication host. It allows for simultaneous individual speaker tuning during the speaker installation phase, eliminating the need to wait for the communication host and cables to be installed. This enables early detection of equipment defects and wiring problems, avoiding delays caused by later factory repairs. Based on the powerful driving capability of the Sanken 8-tube dual 500W power amplifier chip, and combined with a dual-loop output design, the device can simultaneously drive a large number of speakers of different power (e.g., dozens to hundreds). Compared to the traditional single-unit tuning mode, efficiency is increased by tens of times, significantly reducing manpower. The wooden casing and some reusable components (such as the transformer) reduce manufacturing costs. The modular design allows each component to work independently, with standardized interfaces, and individual disassembly and replacement in case of failure, resulting in low maintenance costs.

[0048] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0049] Finally, it should be noted that the above-described embodiments are merely specific implementations of this utility model, used to illustrate the technical solution of this utility model, and not to limit it. The protection scope of this utility model is not limited thereto. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this utility model. These modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A power amplifier for loudspeaker commissioning, characterized by, The power amplifier includes a signal input module, a preamplifier module, a PWM modulation module, a power amplifier module, a low-frequency filter module, and an output transformer module connected in sequence. The signal input module is used to support multiple audio signal input methods; The preamplifier module is used to amplify the intensity of the audio signal to obtain an amplified intensity signal; The PWM modulation module is used to convert the intensity amplified signal into a high-frequency pulse signal; The power amplification module is used to amplify the high-frequency pulse signal to obtain a power amplified signal; The low-frequency filtering module is used to filter high-frequency interference signals in the power amplified signal to obtain a filtered signal. The output transformer module is used to output the filtered signal to at least one speaker to be tested, so as to test each of the speakers.

2. The power amplifier of claim 1, wherein, The signal input module supports input methods including at least one of the following: FM radio, SD card audio, USB audio, and AUX external audio.

3. The power amplifier according to claim 1, characterized in that, The output transformer module includes a first transformer and a second transformer; the first transformer and the second transformer are respectively connected to different speakers to be tested.

4. The power amplifier according to claim 1, characterized in that, The power amplifier also includes a wooden housing.

5. The power amplifier according to claim 1, characterized in that, The power amplifier also includes a third transformer and a fourth transformer; the third transformer is used to power the preamplifier module; and the fourth transformer is used to power the power amplifier module.

6. The power amplifier according to claim 1, characterized in that, The power amplifier module uses a Sanken brand 8-tube dual 500W high-power amplifier chip.

7. The power amplifier according to claim 1, characterized in that, The power amplifier also includes a heat dissipation module; the heat dissipation module includes a finned heat sink and a silent fan; the finned heat sink is used to dissipate heat from the power amplifier module and to provide a prompt when there is a wiring problem with the speaker to be tested.

8. The power amplifier according to claim 7, characterized in that, One side of the insert-type heat sink is attached to the power amplifier module, and the other side is attached to the silent fan.

9. The power amplifier according to claim 1, characterized in that, The power amplifier further includes a power supply module; the power supply module includes a toroidal transformer and a rectifier bridge; the output terminal of the toroidal transformer is connected to the input terminal of the rectifier bridge, and the output terminal of the rectifier bridge provides voltage to the preamplifier module, the power amplifier module and the signal input module respectively.

10. The power amplifier according to claim 9, characterized in that, The toroidal transformer is a 500W high-power toroidal transformer, and the rectifier bridge is a KBPC5010 rectifier bridge.

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