A power amplifier band backup switching control circuit of multi-mode output

Abstract

A kind of power amplifier band backup switching control circuit of multimodal output, comprising;Audio input circuit, for receiving audio input signal;Audio signal processing circuit is connected with the audio input circuit, for carrying out denoising to audio signal, and improve definition;Power amplifier signal amplification circuit is connected with the audio signal processing circuit, for amplifying audio signal;Power amplifier output switching circuit is connected with the power amplifier signal amplification circuit;Main power amplifier output and backup power amplifier input interface circuit are connected with the power amplifier output switching circuit;MCU control unit is used to send control signal to the power amplifier signal amplification circuit and power amplifier output switching circuit.

Description

Technical Field

[0001] This utility model relates to the field of broadcasting systems, and in particular to a power amplifier with backup switching control circuit for multi-mode output. Background Technology

[0002] The power amplifiers used in current broadcasting systems (especially in large public places such as transportation hubs, stadiums, shopping malls, and convention centers) have significant design flaws in their core functions, posing a considerable safety hazard. The main problems are concentrated in two aspects:

[0003] The output mode is rigid and inflexible, lacking flexibility and adaptability.

[0004] Current power amplifiers generally use a fixed and single output mode. This means that a single output mode is insufficient and cannot meet the complex and ever-changing needs of practical applications.

[0005] The backup and failover mechanism is rudimentary and lacks reliability.

[0006] More critically and dangerously, the backup switching function design of existing power amplifier systems is flawed and lacks sufficient rigor. In theory, critical power amplifier equipment should be configured with an "N+1" or "1+1" hot backup architecture. When the main power amplifier fails, the backup power amplifier should be able to seamlessly, quickly, and automatically take over the load to ensure uninterrupted broadcast signals.

[0007] However, in reality, many systems have overly simplistic or flawed switching logic, insensitive or malfunctioning detection mechanisms (such as heartbeat signals and output status monitoring), and unreliable switching actuators (such as relays and solid-state switches). The switching process itself can even generate noise or brief interruptions. This results in the system being unable to reliably and promptly switch to the backup amplifier when the main power amplifier truly fails (e.g., no output, severe distortion, overheating protection). The consequences of this "switching" are catastrophic: once the main power amplifier fails, entire or part of the critical broadcast area will fall into a "silent" state, posing a significant safety hazard to large public places. Utility Model Content

[0008] To address the aforementioned issues, this technical solution provides a multi-mode output power amplifier with a backup switching control circuit.

[0009] To achieve the above objectives, the technical solution is as follows:

[0010] A power amplifier with backup switching control circuit for multi-mode output includes:

[0011] Audio input circuit, used to receive audio input signals;

[0012] An audio signal processing circuit, connected to the audio input circuit, is used to denoise the audio signal and improve its clarity.

[0013] A power amplifier signal amplification circuit, connected to the audio signal processing circuit, is used to amplify the audio signal;

[0014] The power amplifier output switching circuit is connected to the power amplifier signal amplification circuit.

[0015] The main power amplifier output and backup power amplifier input interface circuits are connected to the power amplifier output switching circuit.

[0016] The MCU control unit is used to send control signals to the power amplifier signal amplification circuit and the power amplifier output switching circuit.

[0017] In some embodiments, it also includes;

[0018] The power amplifier detection circuit is connected to the MCU control unit and the main power amplifier output and backup power amplifier input interface circuits. It is used to collect and detect the current and voltage phase difference output by each module and feed the signal back to the MCU control unit.

[0019] In some embodiments, it also includes;

[0020] The power control circuit is used to provide electrical energy to the module;

[0021] The power amplifier self-test circuit is used to detect the current current, voltage, and impedance.

[0022] The beneficial effects of this application are:

[0023] This application can reduce costs while achieving switching functionality. Currently, it consists of a power amplifier and a main / backup switcher, but now only one device is needed to complete the task. It also realizes dynamic power distribution, making the function more powerful. Furthermore, it can dynamically distribute four power outputs; it can also switch to the backup power amplifier even when there is no power supply. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0025] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;

[0026] Figure 2 This is a schematic diagram of the MCU control unit structure according to an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the power amplifier signal amplification circuit and the power amplifier output switching circuit according to an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the audio signal processing circuit structure according to an embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the audio input circuit structure according to an embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of the power amplifier signal amplification circuit structure according to an embodiment of the present invention. Figure 1 ;

[0031] Figure 7 This is a schematic diagram of the power amplifier signal amplification circuit structure according to an embodiment of the present invention. Figure 2 ;

[0032] Figure 8 This is a schematic diagram of the power amplifier signal amplification circuit structure according to an embodiment of the present invention. Figure 3 . Detailed Implementation

[0033] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0034] Please refer to Figure 1 As shown, a multi-mode output power amplifier with backup switching control circuit includes:

[0035] Audio input circuit, used to receive audio input signals;

[0036] An audio signal processing circuit, connected to the audio input circuit, is used to denoise the audio signal and improve its clarity.

[0037] A power amplifier signal amplification circuit, connected to the audio signal processing circuit, is used to amplify the audio signal;

[0038] The power amplifier output switching circuit is connected to the power amplifier signal amplification circuit.

[0039] The main power amplifier output and backup power amplifier input interface circuits are connected to the power amplifier output switching circuit.

[0040] The MCU control unit is used to send control signals to the power amplifier signal amplification circuit and the power amplifier output switching circuit.

[0041] In this embodiment, it also includes;

[0042] The power amplifier detection circuit is connected to the MCU control unit and the main power amplifier output and backup power amplifier input interface circuits. It is used to collect and detect the current and voltage phase difference output by each module and feed the signal back to the MCU control unit.

[0043] In this embodiment, it also includes;

[0044] The power control circuit is used to provide electrical energy to the module;

[0045] The power amplifier self-test circuit is used to detect the current current, voltage, and impedance.

[0046] Currently, the fixed single output mode of power amplifiers weakens the adaptability and efficiency of broadcast systems, while the lack of rigor in their backup switching function directly leads to a lack of core system reliability. When the main power amplifier fails, the backup system becomes ineffective, and the risk of broadcast interruption is extremely high.

[0047] Therefore, the working principle of this application is as follows:

[0048] The audio signal is input through the audio input circuit (⑤), which adjusts the sensitivity of the audio signal and provides isolation. (Purpose: Isolate ground loop interference: By cutting off the current loop formed by the ground potential difference between different devices, noise such as humming and current noise is eliminated. Suppress common-mode signals: Utilizing the differential transmission principle, common-mode interference introduced by power lines and signal lines is filtered to improve the signal-to-noise ratio. Eliminate the effects of static electricity and voltage difference: Avoid signal distortion or arcing caused by voltage differences between devices due to phase lines or different safety grounds.) Then, it passes through the audio signal processing circuit (⑥), (Purpose: To reduce or remove background noise (such as ambient noise and current noise) through algorithms, improving signal clarity. Dynamic processing: Compression and limiting: The compressor automatically balances the dynamic range of the signal, suppressing peak volume to avoid distortion; the limiter prevents signal overload and ensures equipment safety. Expander and noise gate: The expander amplifies weak signals, and the noise gate cuts off the output when the signal is below the threshold, reducing noise during silent periods. Equalization processing: The equalizer adjusts the loudness of different frequency bands (low frequency, mid frequency, high frequency) to achieve spectrum balance and optimize the listening experience). The processed audio signal is then amplified to 100V through the power amplifier signal amplification circuit (⑦) and power control circuit. The amplified signal then passes through the power amplifier output switching circuit (②) before being output to the main power amplifier output (①) and the backup power amplifier input interface circuit. This is the normal operating state of the main power amplifier. This power amplifier has 4 inputs and 4 outputs, with a default configuration of 250W per output. In the power amplifier detection circuit, a high-frequency sampling circuit monitors the current and voltage phase difference of each output, feeding the detected data back to the MUC control unit. An algorithm accurately calculates the load impedance. Then, through feedback control via the power amplifier signal amplification circuit and power control circuit, and by real-time monitoring of load characteristics (impedance / phase / temperature) combined with intelligent algorithms, the output power of each channel is dynamically adjusted to achieve an optimal balance between efficiency and reliability.

[0049] The power amplifier protection mechanism is the core of ensuring the safe operation of equipment. It monitors abnormal states in real time through the power amplifier's self-testing circuit and triggers protective measures. The testing circuit is a key component in realizing this function. These include:

[0050] Overvoltage protection: When the input voltage exceeds the amplifier's tolerance range, the power supply is immediately cut off to prevent component damage.

[0051] Overcurrent protection: Limits the current when the output current is too high to prevent overheating or burnout.

[0052] Temperature protection: Monitors the power amplifier temperature and activates protection when it exceeds a safe threshold (such as 95℃ or 105℃).

[0053] Short circuit protection: When the output terminal is short-circuited, the input signal amplitude is reduced first. If this is ineffective, the output current is suppressed to a safe value.

[0054] DC protection: When the output stage is damaged and causes a DC signal to be output, the circuit is cut off to protect the speaker.

[0055] The MCU control unit uses data feedback from the power amplifier self-test circuit to immediately control the power amplifier output switching circuit when the power amplifier is in protection mode, switching the speaker output line to the backup power amplifier to achieve seamless connection.

[0056] When the amplifier is without power, the amplifier output switching circuit actively switches the speaker output line to the backup amplifier. (Default configuration).

[0057] The above description is only a preferred embodiment of this application and is not intended to limit the scope of implementation of this application. Any other embodiments whose principles and basic structures are the same as or similar to those of this application are within the protection scope of this application.

Claims

1. A power amplifier with backup switching control circuit for multi-mode output, characterized in that, include; Audio input circuit, used to receive audio input signals; An audio signal processing circuit, connected to the audio input circuit, is used to denoise the audio signal and improve its clarity. A power amplifier signal amplification circuit, connected to the audio signal processing circuit, is used to amplify the audio signal; The power amplifier output switching circuit is connected to the power amplifier signal amplification circuit. The main power amplifier output and backup power amplifier input interface circuits are connected to the power amplifier output switching circuit. The MCU control unit is used to send control signals to the power amplifier signal amplification circuit and the power amplifier output switching circuit.

2. The power amplifier with backup switching control circuit for multi-mode output according to claim 1, characterized in that: Also includes; The power amplifier detection circuit is connected to the MCU control unit and the main power amplifier output and backup power amplifier input interface circuits. It is used to collect and detect the current and voltage phase difference output by each module and feed the signal back to the MCU control unit.

3. The power amplifier with backup switching control circuit for multi-mode output according to claim 2, characterized in that: Also includes; The power control circuit is used to provide electrical energy to the module; The power amplifier self-test circuit is used to detect the current current, voltage, and impedance.

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